), group 1 => duration, group 2 => title\n/(?!#) *(\\S[^\\r\\n]*)/.source,\n// segment URI, group 3 => the URI (note newline is not eaten)\n/#EXT-X-BYTERANGE:*(.+)/.source,\n// next segment's byterange, group 4 => range spec (x@y)\n/#EXT-X-PROGRAM-DATE-TIME:(.+)/.source,\n// next segment's program date/time group 5 => the datetime spec\n/#.*/.source // All other non-segment oriented tags will match with all groups empty\n].join('|'), 'g');\nconst LEVEL_PLAYLIST_REGEX_SLOW = new RegExp([/#(EXTM3U)/.source, /#EXT-X-(DATERANGE|DEFINE|KEY|MAP|PART|PART-INF|PLAYLIST-TYPE|PRELOAD-HINT|RENDITION-REPORT|SERVER-CONTROL|SKIP|START):(.+)/.source, /#EXT-X-(BITRATE|DISCONTINUITY-SEQUENCE|MEDIA-SEQUENCE|TARGETDURATION|VERSION): *(\\d+)/.source, /#EXT-X-(DISCONTINUITY|ENDLIST|GAP|INDEPENDENT-SEGMENTS)/.source, /(#)([^:]*):(.*)/.source, /(#)(.*)(?:.*)\\r?\\n?/.source].join('|'));\nclass M3U8Parser {\n static findGroup(groups, mediaGroupId) {\n for (let i = 0; i < groups.length; i++) {\n const group = groups[i];\n if (group.id === mediaGroupId) {\n return group;\n }\n }\n }\n static resolve(url, baseUrl) {\n return urlToolkitExports.buildAbsoluteURL(baseUrl, url, {\n alwaysNormalize: true\n });\n }\n static isMediaPlaylist(str) {\n return IS_MEDIA_PLAYLIST.test(str);\n }\n static parseMasterPlaylist(string, baseurl) {\n const hasVariableRefs = hasVariableReferences(string) ;\n const parsed = {\n contentSteering: null,\n levels: [],\n playlistParsingError: null,\n sessionData: null,\n sessionKeys: null,\n startTimeOffset: null,\n variableList: null,\n hasVariableRefs\n };\n const levelsWithKnownCodecs = [];\n MASTER_PLAYLIST_REGEX.lastIndex = 0;\n let result;\n while ((result = MASTER_PLAYLIST_REGEX.exec(string)) != null) {\n if (result[1]) {\n var _level$unknownCodecs;\n // '#EXT-X-STREAM-INF' is found, parse level tag in group 1\n const attrs = new AttrList(result[1]);\n {\n substituteVariablesInAttributes(parsed, attrs, ['CODECS', 'SUPPLEMENTAL-CODECS', 'ALLOWED-CPC', 'PATHWAY-ID', 'STABLE-VARIANT-ID', 'AUDIO', 'VIDEO', 'SUBTITLES', 'CLOSED-CAPTIONS', 'NAME']);\n }\n const uri = substituteVariables(parsed, result[2]) ;\n const level = {\n attrs,\n bitrate: attrs.decimalInteger('BANDWIDTH') || attrs.decimalInteger('AVERAGE-BANDWIDTH'),\n name: attrs.NAME,\n url: M3U8Parser.resolve(uri, baseurl)\n };\n const resolution = attrs.decimalResolution('RESOLUTION');\n if (resolution) {\n level.width = resolution.width;\n level.height = resolution.height;\n }\n setCodecs(attrs.CODECS, level);\n if (!((_level$unknownCodecs = level.unknownCodecs) != null && _level$unknownCodecs.length)) {\n levelsWithKnownCodecs.push(level);\n }\n parsed.levels.push(level);\n } else if (result[3]) {\n const tag = result[3];\n const attributes = result[4];\n switch (tag) {\n case 'SESSION-DATA':\n {\n // #EXT-X-SESSION-DATA\n const sessionAttrs = new AttrList(attributes);\n {\n substituteVariablesInAttributes(parsed, sessionAttrs, ['DATA-ID', 'LANGUAGE', 'VALUE', 'URI']);\n }\n const dataId = sessionAttrs['DATA-ID'];\n if (dataId) {\n if (parsed.sessionData === null) {\n parsed.sessionData = {};\n }\n parsed.sessionData[dataId] = sessionAttrs;\n }\n break;\n }\n case 'SESSION-KEY':\n {\n // #EXT-X-SESSION-KEY\n const sessionKey = parseKey(attributes, baseurl, parsed);\n if (sessionKey.encrypted && sessionKey.isSupported()) {\n if (parsed.sessionKeys === null) {\n parsed.sessionKeys = [];\n }\n parsed.sessionKeys.push(sessionKey);\n } else {\n logger.warn(`[Keys] Ignoring invalid EXT-X-SESSION-KEY tag: \"${attributes}\"`);\n }\n break;\n }\n case 'DEFINE':\n {\n // #EXT-X-DEFINE\n {\n const variableAttributes = new AttrList(attributes);\n substituteVariablesInAttributes(parsed, variableAttributes, ['NAME', 'VALUE', 'QUERYPARAM']);\n addVariableDefinition(parsed, variableAttributes, baseurl);\n }\n break;\n }\n case 'CONTENT-STEERING':\n {\n // #EXT-X-CONTENT-STEERING\n const contentSteeringAttributes = new AttrList(attributes);\n {\n substituteVariablesInAttributes(parsed, contentSteeringAttributes, ['SERVER-URI', 'PATHWAY-ID']);\n }\n parsed.contentSteering = {\n uri: M3U8Parser.resolve(contentSteeringAttributes['SERVER-URI'], baseurl),\n pathwayId: contentSteeringAttributes['PATHWAY-ID'] || '.'\n };\n break;\n }\n case 'START':\n {\n // #EXT-X-START\n parsed.startTimeOffset = parseStartTimeOffset(attributes);\n break;\n }\n }\n }\n }\n // Filter out levels with unknown codecs if it does not remove all levels\n const stripUnknownCodecLevels = levelsWithKnownCodecs.length > 0 && levelsWithKnownCodecs.length < parsed.levels.length;\n parsed.levels = stripUnknownCodecLevels ? levelsWithKnownCodecs : parsed.levels;\n if (parsed.levels.length === 0) {\n parsed.playlistParsingError = new Error('no levels found in manifest');\n }\n return parsed;\n }\n static parseMasterPlaylistMedia(string, baseurl, parsed) {\n let result;\n const results = {};\n const levels = parsed.levels;\n const groupsByType = {\n AUDIO: levels.map(level => ({\n id: level.attrs.AUDIO,\n audioCodec: level.audioCodec\n })),\n SUBTITLES: levels.map(level => ({\n id: level.attrs.SUBTITLES,\n textCodec: level.textCodec\n })),\n 'CLOSED-CAPTIONS': []\n };\n let id = 0;\n MASTER_PLAYLIST_MEDIA_REGEX.lastIndex = 0;\n while ((result = MASTER_PLAYLIST_MEDIA_REGEX.exec(string)) !== null) {\n const attrs = new AttrList(result[1]);\n const type = attrs.TYPE;\n if (type) {\n const groups = groupsByType[type];\n const medias = results[type] || [];\n results[type] = medias;\n {\n substituteVariablesInAttributes(parsed, attrs, ['URI', 'GROUP-ID', 'LANGUAGE', 'ASSOC-LANGUAGE', 'STABLE-RENDITION-ID', 'NAME', 'INSTREAM-ID', 'CHARACTERISTICS', 'CHANNELS']);\n }\n const lang = attrs.LANGUAGE;\n const assocLang = attrs['ASSOC-LANGUAGE'];\n const channels = attrs.CHANNELS;\n const characteristics = attrs.CHARACTERISTICS;\n const instreamId = attrs['INSTREAM-ID'];\n const media = {\n attrs,\n bitrate: 0,\n id: id++,\n groupId: attrs['GROUP-ID'] || '',\n name: attrs.NAME || lang || '',\n type,\n default: attrs.bool('DEFAULT'),\n autoselect: attrs.bool('AUTOSELECT'),\n forced: attrs.bool('FORCED'),\n lang,\n url: attrs.URI ? M3U8Parser.resolve(attrs.URI, baseurl) : ''\n };\n if (assocLang) {\n media.assocLang = assocLang;\n }\n if (channels) {\n media.channels = channels;\n }\n if (characteristics) {\n media.characteristics = characteristics;\n }\n if (instreamId) {\n media.instreamId = instreamId;\n }\n if (groups != null && groups.length) {\n // If there are audio or text groups signalled in the manifest, let's look for a matching codec string for this track\n // If we don't find the track signalled, lets use the first audio groups codec we have\n // Acting as a best guess\n const groupCodec = M3U8Parser.findGroup(groups, media.groupId) || groups[0];\n assignCodec(media, groupCodec, 'audioCodec');\n assignCodec(media, groupCodec, 'textCodec');\n }\n medias.push(media);\n }\n }\n return results;\n }\n static parseLevelPlaylist(string, baseurl, id, type, levelUrlId, multivariantVariableList) {\n const level = new LevelDetails(baseurl);\n const fragments = level.fragments;\n // The most recent init segment seen (applies to all subsequent segments)\n let currentInitSegment = null;\n let currentSN = 0;\n let currentPart = 0;\n let totalduration = 0;\n let discontinuityCounter = 0;\n let prevFrag = null;\n let frag = new Fragment(type, baseurl);\n let result;\n let i;\n let levelkeys;\n let firstPdtIndex = -1;\n let createNextFrag = false;\n let nextByteRange = null;\n LEVEL_PLAYLIST_REGEX_FAST.lastIndex = 0;\n level.m3u8 = string;\n level.hasVariableRefs = hasVariableReferences(string) ;\n while ((result = LEVEL_PLAYLIST_REGEX_FAST.exec(string)) !== null) {\n if (createNextFrag) {\n createNextFrag = false;\n frag = new Fragment(type, baseurl);\n // setup the next fragment for part loading\n frag.start = totalduration;\n frag.sn = currentSN;\n frag.cc = discontinuityCounter;\n frag.level = id;\n if (currentInitSegment) {\n frag.initSegment = currentInitSegment;\n frag.rawProgramDateTime = currentInitSegment.rawProgramDateTime;\n currentInitSegment.rawProgramDateTime = null;\n if (nextByteRange) {\n frag.setByteRange(nextByteRange);\n nextByteRange = null;\n }\n }\n }\n const duration = result[1];\n if (duration) {\n // INF\n frag.duration = parseFloat(duration);\n // avoid sliced strings https://github.com/video-dev/hls.js/issues/939\n const title = (' ' + result[2]).slice(1);\n frag.title = title || null;\n frag.tagList.push(title ? ['INF', duration, title] : ['INF', duration]);\n } else if (result[3]) {\n // url\n if (isFiniteNumber(frag.duration)) {\n frag.start = totalduration;\n if (levelkeys) {\n setFragLevelKeys(frag, levelkeys, level);\n }\n frag.sn = currentSN;\n frag.level = id;\n frag.cc = discontinuityCounter;\n fragments.push(frag);\n // avoid sliced strings https://github.com/video-dev/hls.js/issues/939\n const uri = (' ' + result[3]).slice(1);\n frag.relurl = substituteVariables(level, uri) ;\n assignProgramDateTime(frag, prevFrag);\n prevFrag = frag;\n totalduration += frag.duration;\n currentSN++;\n currentPart = 0;\n createNextFrag = true;\n }\n } else if (result[4]) {\n // X-BYTERANGE\n const data = (' ' + result[4]).slice(1);\n if (prevFrag) {\n frag.setByteRange(data, prevFrag);\n } else {\n frag.setByteRange(data);\n }\n } else if (result[5]) {\n // PROGRAM-DATE-TIME\n // avoid sliced strings https://github.com/video-dev/hls.js/issues/939\n frag.rawProgramDateTime = (' ' + result[5]).slice(1);\n frag.tagList.push(['PROGRAM-DATE-TIME', frag.rawProgramDateTime]);\n if (firstPdtIndex === -1) {\n firstPdtIndex = fragments.length;\n }\n } else {\n result = result[0].match(LEVEL_PLAYLIST_REGEX_SLOW);\n if (!result) {\n logger.warn('No matches on slow regex match for level playlist!');\n continue;\n }\n for (i = 1; i < result.length; i++) {\n if (typeof result[i] !== 'undefined') {\n break;\n }\n }\n\n // avoid sliced strings https://github.com/video-dev/hls.js/issues/939\n const tag = (' ' + result[i]).slice(1);\n const value1 = (' ' + result[i + 1]).slice(1);\n const value2 = result[i + 2] ? (' ' + result[i + 2]).slice(1) : '';\n switch (tag) {\n case 'PLAYLIST-TYPE':\n level.type = value1.toUpperCase();\n break;\n case 'MEDIA-SEQUENCE':\n currentSN = level.startSN = parseInt(value1);\n break;\n case 'SKIP':\n {\n const skipAttrs = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, skipAttrs, ['RECENTLY-REMOVED-DATERANGES']);\n }\n const skippedSegments = skipAttrs.decimalInteger('SKIPPED-SEGMENTS');\n if (isFiniteNumber(skippedSegments)) {\n level.skippedSegments = skippedSegments;\n // This will result in fragments[] containing undefined values, which we will fill in with `mergeDetails`\n for (let _i = skippedSegments; _i--;) {\n fragments.unshift(null);\n }\n currentSN += skippedSegments;\n }\n const recentlyRemovedDateranges = skipAttrs.enumeratedString('RECENTLY-REMOVED-DATERANGES');\n if (recentlyRemovedDateranges) {\n level.recentlyRemovedDateranges = recentlyRemovedDateranges.split('\\t');\n }\n break;\n }\n case 'TARGETDURATION':\n level.targetduration = Math.max(parseInt(value1), 1);\n break;\n case 'VERSION':\n level.version = parseInt(value1);\n break;\n case 'INDEPENDENT-SEGMENTS':\n case 'EXTM3U':\n break;\n case 'ENDLIST':\n level.live = false;\n break;\n case '#':\n if (value1 || value2) {\n frag.tagList.push(value2 ? [value1, value2] : [value1]);\n }\n break;\n case 'DISCONTINUITY':\n discontinuityCounter++;\n frag.tagList.push(['DIS']);\n break;\n case 'GAP':\n frag.gap = true;\n frag.tagList.push([tag]);\n break;\n case 'BITRATE':\n frag.tagList.push([tag, value1]);\n break;\n case 'DATERANGE':\n {\n const dateRangeAttr = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, dateRangeAttr, ['ID', 'CLASS', 'START-DATE', 'END-DATE', 'SCTE35-CMD', 'SCTE35-OUT', 'SCTE35-IN']);\n substituteVariablesInAttributes(level, dateRangeAttr, dateRangeAttr.clientAttrs);\n }\n const dateRange = new DateRange(dateRangeAttr, level.dateRanges[dateRangeAttr.ID]);\n if (dateRange.isValid || level.skippedSegments) {\n level.dateRanges[dateRange.id] = dateRange;\n } else {\n logger.warn(`Ignoring invalid DATERANGE tag: \"${value1}\"`);\n }\n // Add to fragment tag list for backwards compatibility (< v1.2.0)\n frag.tagList.push(['EXT-X-DATERANGE', value1]);\n break;\n }\n case 'DEFINE':\n {\n {\n const variableAttributes = new AttrList(value1);\n substituteVariablesInAttributes(level, variableAttributes, ['NAME', 'VALUE', 'IMPORT', 'QUERYPARAM']);\n if ('IMPORT' in variableAttributes) {\n importVariableDefinition(level, variableAttributes, multivariantVariableList);\n } else {\n addVariableDefinition(level, variableAttributes, baseurl);\n }\n }\n break;\n }\n case 'DISCONTINUITY-SEQUENCE':\n discontinuityCounter = parseInt(value1);\n break;\n case 'KEY':\n {\n const levelKey = parseKey(value1, baseurl, level);\n if (levelKey.isSupported()) {\n if (levelKey.method === 'NONE') {\n levelkeys = undefined;\n break;\n }\n if (!levelkeys) {\n levelkeys = {};\n }\n if (levelkeys[levelKey.keyFormat]) {\n levelkeys = _extends({}, levelkeys);\n }\n levelkeys[levelKey.keyFormat] = levelKey;\n } else {\n logger.warn(`[Keys] Ignoring invalid EXT-X-KEY tag: \"${value1}\"`);\n }\n break;\n }\n case 'START':\n level.startTimeOffset = parseStartTimeOffset(value1);\n break;\n case 'MAP':\n {\n const mapAttrs = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, mapAttrs, ['BYTERANGE', 'URI']);\n }\n if (frag.duration) {\n // Initial segment tag is after segment duration tag.\n // #EXTINF: 6.0\n // #EXT-X-MAP:URI=\"init.mp4\n const init = new Fragment(type, baseurl);\n setInitSegment(init, mapAttrs, id, levelkeys);\n currentInitSegment = init;\n frag.initSegment = currentInitSegment;\n if (currentInitSegment.rawProgramDateTime && !frag.rawProgramDateTime) {\n frag.rawProgramDateTime = currentInitSegment.rawProgramDateTime;\n }\n } else {\n // Initial segment tag is before segment duration tag\n // Handle case where EXT-X-MAP is declared after EXT-X-BYTERANGE\n const end = frag.byteRangeEndOffset;\n if (end) {\n const start = frag.byteRangeStartOffset;\n nextByteRange = `${end - start}@${start}`;\n } else {\n nextByteRange = null;\n }\n setInitSegment(frag, mapAttrs, id, levelkeys);\n currentInitSegment = frag;\n createNextFrag = true;\n }\n break;\n }\n case 'SERVER-CONTROL':\n {\n const serverControlAttrs = new AttrList(value1);\n level.canBlockReload = serverControlAttrs.bool('CAN-BLOCK-RELOAD');\n level.canSkipUntil = serverControlAttrs.optionalFloat('CAN-SKIP-UNTIL', 0);\n level.canSkipDateRanges = level.canSkipUntil > 0 && serverControlAttrs.bool('CAN-SKIP-DATERANGES');\n level.partHoldBack = serverControlAttrs.optionalFloat('PART-HOLD-BACK', 0);\n level.holdBack = serverControlAttrs.optionalFloat('HOLD-BACK', 0);\n break;\n }\n case 'PART-INF':\n {\n const partInfAttrs = new AttrList(value1);\n level.partTarget = partInfAttrs.decimalFloatingPoint('PART-TARGET');\n break;\n }\n case 'PART':\n {\n let partList = level.partList;\n if (!partList) {\n partList = level.partList = [];\n }\n const previousFragmentPart = currentPart > 0 ? partList[partList.length - 1] : undefined;\n const index = currentPart++;\n const partAttrs = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, partAttrs, ['BYTERANGE', 'URI']);\n }\n const part = new Part(partAttrs, frag, baseurl, index, previousFragmentPart);\n partList.push(part);\n frag.duration += part.duration;\n break;\n }\n case 'PRELOAD-HINT':\n {\n const preloadHintAttrs = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, preloadHintAttrs, ['URI']);\n }\n level.preloadHint = preloadHintAttrs;\n break;\n }\n case 'RENDITION-REPORT':\n {\n const renditionReportAttrs = new AttrList(value1);\n {\n substituteVariablesInAttributes(level, renditionReportAttrs, ['URI']);\n }\n level.renditionReports = level.renditionReports || [];\n level.renditionReports.push(renditionReportAttrs);\n break;\n }\n default:\n logger.warn(`line parsed but not handled: ${result}`);\n break;\n }\n }\n }\n if (prevFrag && !prevFrag.relurl) {\n fragments.pop();\n totalduration -= prevFrag.duration;\n if (level.partList) {\n level.fragmentHint = prevFrag;\n }\n } else if (level.partList) {\n assignProgramDateTime(frag, prevFrag);\n frag.cc = discontinuityCounter;\n level.fragmentHint = frag;\n if (levelkeys) {\n setFragLevelKeys(frag, levelkeys, level);\n }\n }\n const fragmentLength = fragments.length;\n const firstFragment = fragments[0];\n const lastFragment = fragments[fragmentLength - 1];\n totalduration += level.skippedSegments * level.targetduration;\n if (totalduration > 0 && fragmentLength && lastFragment) {\n level.averagetargetduration = totalduration / fragmentLength;\n const lastSn = lastFragment.sn;\n level.endSN = lastSn !== 'initSegment' ? lastSn : 0;\n if (!level.live) {\n lastFragment.endList = true;\n }\n if (firstFragment) {\n level.startCC = firstFragment.cc;\n }\n } else {\n level.endSN = 0;\n level.startCC = 0;\n }\n if (level.fragmentHint) {\n totalduration += level.fragmentHint.duration;\n }\n level.totalduration = totalduration;\n level.endCC = discontinuityCounter;\n\n /**\n * Backfill any missing PDT values\n * \"If the first EXT-X-PROGRAM-DATE-TIME tag in a Playlist appears after\n * one or more Media Segment URIs, the client SHOULD extrapolate\n * backward from that tag (using EXTINF durations and/or media\n * timestamps) to associate dates with those segments.\"\n * We have already extrapolated forward, but all fragments up to the first instance of PDT do not have their PDTs\n * computed.\n */\n if (firstPdtIndex > 0) {\n backfillProgramDateTimes(fragments, firstPdtIndex);\n }\n return level;\n }\n}\nfunction parseKey(keyTagAttributes, baseurl, parsed) {\n var _keyAttrs$METHOD, _keyAttrs$KEYFORMAT;\n // https://tools.ietf.org/html/rfc8216#section-4.3.2.4\n const keyAttrs = new AttrList(keyTagAttributes);\n {\n substituteVariablesInAttributes(parsed, keyAttrs, ['KEYFORMAT', 'KEYFORMATVERSIONS', 'URI', 'IV', 'URI']);\n }\n const decryptmethod = (_keyAttrs$METHOD = keyAttrs.METHOD) != null ? _keyAttrs$METHOD : '';\n const decrypturi = keyAttrs.URI;\n const decryptiv = keyAttrs.hexadecimalInteger('IV');\n const decryptkeyformatversions = keyAttrs.KEYFORMATVERSIONS;\n // From RFC: This attribute is OPTIONAL; its absence indicates an implicit value of \"identity\".\n const decryptkeyformat = (_keyAttrs$KEYFORMAT = keyAttrs.KEYFORMAT) != null ? _keyAttrs$KEYFORMAT : 'identity';\n if (decrypturi && keyAttrs.IV && !decryptiv) {\n logger.error(`Invalid IV: ${keyAttrs.IV}`);\n }\n // If decrypturi is a URI with a scheme, then baseurl will be ignored\n // No uri is allowed when METHOD is NONE\n const resolvedUri = decrypturi ? M3U8Parser.resolve(decrypturi, baseurl) : '';\n const keyFormatVersions = (decryptkeyformatversions ? decryptkeyformatversions : '1').split('/').map(Number).filter(Number.isFinite);\n return new LevelKey(decryptmethod, resolvedUri, decryptkeyformat, keyFormatVersions, decryptiv);\n}\nfunction parseStartTimeOffset(startAttributes) {\n const startAttrs = new AttrList(startAttributes);\n const startTimeOffset = startAttrs.decimalFloatingPoint('TIME-OFFSET');\n if (isFiniteNumber(startTimeOffset)) {\n return startTimeOffset;\n }\n return null;\n}\nfunction setCodecs(codecsAttributeValue, level) {\n let codecs = (codecsAttributeValue || '').split(/[ ,]+/).filter(c => c);\n ['video', 'audio', 'text'].forEach(type => {\n const filtered = codecs.filter(codec => isCodecType(codec, type));\n if (filtered.length) {\n // Comma separated list of all codecs for type\n level[`${type}Codec`] = filtered.join(',');\n // Remove known codecs so that only unknownCodecs are left after iterating through each type\n codecs = codecs.filter(codec => filtered.indexOf(codec) === -1);\n }\n });\n level.unknownCodecs = codecs;\n}\nfunction assignCodec(media, groupItem, codecProperty) {\n const codecValue = groupItem[codecProperty];\n if (codecValue) {\n media[codecProperty] = codecValue;\n }\n}\nfunction backfillProgramDateTimes(fragments, firstPdtIndex) {\n let fragPrev = fragments[firstPdtIndex];\n for (let i = firstPdtIndex; i--;) {\n const frag = fragments[i];\n // Exit on delta-playlist skipped segments\n if (!frag) {\n return;\n }\n frag.programDateTime = fragPrev.programDateTime - frag.duration * 1000;\n fragPrev = frag;\n }\n}\nfunction assignProgramDateTime(frag, prevFrag) {\n if (frag.rawProgramDateTime) {\n frag.programDateTime = Date.parse(frag.rawProgramDateTime);\n } else if (prevFrag != null && prevFrag.programDateTime) {\n frag.programDateTime = prevFrag.endProgramDateTime;\n }\n if (!isFiniteNumber(frag.programDateTime)) {\n frag.programDateTime = null;\n frag.rawProgramDateTime = null;\n }\n}\nfunction setInitSegment(frag, mapAttrs, id, levelkeys) {\n frag.relurl = mapAttrs.URI;\n if (mapAttrs.BYTERANGE) {\n frag.setByteRange(mapAttrs.BYTERANGE);\n }\n frag.level = id;\n frag.sn = 'initSegment';\n if (levelkeys) {\n frag.levelkeys = levelkeys;\n }\n frag.initSegment = null;\n}\nfunction setFragLevelKeys(frag, levelkeys, level) {\n frag.levelkeys = levelkeys;\n const {\n encryptedFragments\n } = level;\n if ((!encryptedFragments.length || encryptedFragments[encryptedFragments.length - 1].levelkeys !== levelkeys) && Object.keys(levelkeys).some(format => levelkeys[format].isCommonEncryption)) {\n encryptedFragments.push(frag);\n }\n}\n\nvar PlaylistContextType = {\n MANIFEST: \"manifest\",\n LEVEL: \"level\",\n AUDIO_TRACK: \"audioTrack\",\n SUBTITLE_TRACK: \"subtitleTrack\"\n};\nvar PlaylistLevelType = {\n MAIN: \"main\",\n AUDIO: \"audio\",\n SUBTITLE: \"subtitle\"\n};\n\nfunction mapContextToLevelType(context) {\n const {\n type\n } = context;\n switch (type) {\n case PlaylistContextType.AUDIO_TRACK:\n return PlaylistLevelType.AUDIO;\n case PlaylistContextType.SUBTITLE_TRACK:\n return PlaylistLevelType.SUBTITLE;\n default:\n return PlaylistLevelType.MAIN;\n }\n}\nfunction getResponseUrl(response, context) {\n let url = response.url;\n // responseURL not supported on some browsers (it is used to detect URL redirection)\n // data-uri mode also not supported (but no need to detect redirection)\n if (url === undefined || url.indexOf('data:') === 0) {\n // fallback to initial URL\n url = context.url;\n }\n return url;\n}\nclass PlaylistLoader {\n constructor(hls) {\n this.hls = void 0;\n this.loaders = Object.create(null);\n this.variableList = null;\n this.hls = hls;\n this.registerListeners();\n }\n startLoad(startPosition) {}\n stopLoad() {\n this.destroyInternalLoaders();\n }\n registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.on(Events.AUDIO_TRACK_LOADING, this.onAudioTrackLoading, this);\n hls.on(Events.SUBTITLE_TRACK_LOADING, this.onSubtitleTrackLoading, this);\n }\n unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.off(Events.AUDIO_TRACK_LOADING, this.onAudioTrackLoading, this);\n hls.off(Events.SUBTITLE_TRACK_LOADING, this.onSubtitleTrackLoading, this);\n }\n\n /**\n * Returns defaults or configured loader-type overloads (pLoader and loader config params)\n */\n createInternalLoader(context) {\n const config = this.hls.config;\n const PLoader = config.pLoader;\n const Loader = config.loader;\n const InternalLoader = PLoader || Loader;\n const loader = new InternalLoader(config);\n this.loaders[context.type] = loader;\n return loader;\n }\n getInternalLoader(context) {\n return this.loaders[context.type];\n }\n resetInternalLoader(contextType) {\n if (this.loaders[contextType]) {\n delete this.loaders[contextType];\n }\n }\n\n /**\n * Call `destroy` on all internal loader instances mapped (one per context type)\n */\n destroyInternalLoaders() {\n for (const contextType in this.loaders) {\n const loader = this.loaders[contextType];\n if (loader) {\n loader.destroy();\n }\n this.resetInternalLoader(contextType);\n }\n }\n destroy() {\n this.variableList = null;\n this.unregisterListeners();\n this.destroyInternalLoaders();\n }\n onManifestLoading(event, data) {\n const {\n url\n } = data;\n this.variableList = null;\n this.load({\n id: null,\n level: 0,\n responseType: 'text',\n type: PlaylistContextType.MANIFEST,\n url,\n deliveryDirectives: null\n });\n }\n onLevelLoading(event, data) {\n const {\n id,\n level,\n pathwayId,\n url,\n deliveryDirectives\n } = data;\n this.load({\n id,\n level,\n pathwayId,\n responseType: 'text',\n type: PlaylistContextType.LEVEL,\n url,\n deliveryDirectives\n });\n }\n onAudioTrackLoading(event, data) {\n const {\n id,\n groupId,\n url,\n deliveryDirectives\n } = data;\n this.load({\n id,\n groupId,\n level: null,\n responseType: 'text',\n type: PlaylistContextType.AUDIO_TRACK,\n url,\n deliveryDirectives\n });\n }\n onSubtitleTrackLoading(event, data) {\n const {\n id,\n groupId,\n url,\n deliveryDirectives\n } = data;\n this.load({\n id,\n groupId,\n level: null,\n responseType: 'text',\n type: PlaylistContextType.SUBTITLE_TRACK,\n url,\n deliveryDirectives\n });\n }\n load(context) {\n var _context$deliveryDire;\n const config = this.hls.config;\n\n // logger.debug(`[playlist-loader]: Loading playlist of type ${context.type}, level: ${context.level}, id: ${context.id}`);\n\n // Check if a loader for this context already exists\n let loader = this.getInternalLoader(context);\n if (loader) {\n const loaderContext = loader.context;\n if (loaderContext && loaderContext.url === context.url && loaderContext.level === context.level) {\n // same URL can't overlap\n logger.trace('[playlist-loader]: playlist request ongoing');\n return;\n }\n logger.log(`[playlist-loader]: aborting previous loader for type: ${context.type}`);\n loader.abort();\n }\n\n // apply different configs for retries depending on\n // context (manifest, level, audio/subs playlist)\n let loadPolicy;\n if (context.type === PlaylistContextType.MANIFEST) {\n loadPolicy = config.manifestLoadPolicy.default;\n } else {\n loadPolicy = _extends({}, config.playlistLoadPolicy.default, {\n timeoutRetry: null,\n errorRetry: null\n });\n }\n loader = this.createInternalLoader(context);\n\n // Override level/track timeout for LL-HLS requests\n // (the default of 10000ms is counter productive to blocking playlist reload requests)\n if (isFiniteNumber((_context$deliveryDire = context.deliveryDirectives) == null ? void 0 : _context$deliveryDire.part)) {\n let levelDetails;\n if (context.type === PlaylistContextType.LEVEL && context.level !== null) {\n levelDetails = this.hls.levels[context.level].details;\n } else if (context.type === PlaylistContextType.AUDIO_TRACK && context.id !== null) {\n levelDetails = this.hls.audioTracks[context.id].details;\n } else if (context.type === PlaylistContextType.SUBTITLE_TRACK && context.id !== null) {\n levelDetails = this.hls.subtitleTracks[context.id].details;\n }\n if (levelDetails) {\n const partTarget = levelDetails.partTarget;\n const targetDuration = levelDetails.targetduration;\n if (partTarget && targetDuration) {\n const maxLowLatencyPlaylistRefresh = Math.max(partTarget * 3, targetDuration * 0.8) * 1000;\n loadPolicy = _extends({}, loadPolicy, {\n maxTimeToFirstByteMs: Math.min(maxLowLatencyPlaylistRefresh, loadPolicy.maxTimeToFirstByteMs),\n maxLoadTimeMs: Math.min(maxLowLatencyPlaylistRefresh, loadPolicy.maxTimeToFirstByteMs)\n });\n }\n }\n }\n const legacyRetryCompatibility = loadPolicy.errorRetry || loadPolicy.timeoutRetry || {};\n const loaderConfig = {\n loadPolicy,\n timeout: loadPolicy.maxLoadTimeMs,\n maxRetry: legacyRetryCompatibility.maxNumRetry || 0,\n retryDelay: legacyRetryCompatibility.retryDelayMs || 0,\n maxRetryDelay: legacyRetryCompatibility.maxRetryDelayMs || 0\n };\n const loaderCallbacks = {\n onSuccess: (response, stats, context, networkDetails) => {\n const loader = this.getInternalLoader(context);\n this.resetInternalLoader(context.type);\n const string = response.data;\n\n // Validate if it is an M3U8 at all\n if (string.indexOf('#EXTM3U') !== 0) {\n this.handleManifestParsingError(response, context, new Error('no EXTM3U delimiter'), networkDetails || null, stats);\n return;\n }\n stats.parsing.start = performance.now();\n if (M3U8Parser.isMediaPlaylist(string)) {\n this.handleTrackOrLevelPlaylist(response, stats, context, networkDetails || null, loader);\n } else {\n this.handleMasterPlaylist(response, stats, context, networkDetails);\n }\n },\n onError: (response, context, networkDetails, stats) => {\n this.handleNetworkError(context, networkDetails, false, response, stats);\n },\n onTimeout: (stats, context, networkDetails) => {\n this.handleNetworkError(context, networkDetails, true, undefined, stats);\n }\n };\n\n // logger.debug(`[playlist-loader]: Calling internal loader delegate for URL: ${context.url}`);\n\n loader.load(context, loaderConfig, loaderCallbacks);\n }\n handleMasterPlaylist(response, stats, context, networkDetails) {\n const hls = this.hls;\n const string = response.data;\n const url = getResponseUrl(response, context);\n const parsedResult = M3U8Parser.parseMasterPlaylist(string, url);\n if (parsedResult.playlistParsingError) {\n this.handleManifestParsingError(response, context, parsedResult.playlistParsingError, networkDetails, stats);\n return;\n }\n const {\n contentSteering,\n levels,\n sessionData,\n sessionKeys,\n startTimeOffset,\n variableList\n } = parsedResult;\n this.variableList = variableList;\n const {\n AUDIO: audioTracks = [],\n SUBTITLES: subtitles,\n 'CLOSED-CAPTIONS': captions\n } = M3U8Parser.parseMasterPlaylistMedia(string, url, parsedResult);\n if (audioTracks.length) {\n // check if we have found an audio track embedded in main playlist (audio track without URI attribute)\n const embeddedAudioFound = audioTracks.some(audioTrack => !audioTrack.url);\n\n // if no embedded audio track defined, but audio codec signaled in quality level,\n // we need to signal this main audio track this could happen with playlists with\n // alt audio rendition in which quality levels (main)\n // contains both audio+video. but with mixed audio track not signaled\n if (!embeddedAudioFound && levels[0].audioCodec && !levels[0].attrs.AUDIO) {\n logger.log('[playlist-loader]: audio codec signaled in quality level, but no embedded audio track signaled, create one');\n audioTracks.unshift({\n type: 'main',\n name: 'main',\n groupId: 'main',\n default: false,\n autoselect: false,\n forced: false,\n id: -1,\n attrs: new AttrList({}),\n bitrate: 0,\n url: ''\n });\n }\n }\n hls.trigger(Events.MANIFEST_LOADED, {\n levels,\n audioTracks,\n subtitles,\n captions,\n contentSteering,\n url,\n stats,\n networkDetails,\n sessionData,\n sessionKeys,\n startTimeOffset,\n variableList\n });\n }\n handleTrackOrLevelPlaylist(response, stats, context, networkDetails, loader) {\n const hls = this.hls;\n const {\n id,\n level,\n type\n } = context;\n const url = getResponseUrl(response, context);\n const levelUrlId = 0;\n const levelId = isFiniteNumber(level) ? level : isFiniteNumber(id) ? id : 0;\n const levelType = mapContextToLevelType(context);\n const levelDetails = M3U8Parser.parseLevelPlaylist(response.data, url, levelId, levelType, levelUrlId, this.variableList);\n\n // We have done our first request (Manifest-type) and receive\n // not a master playlist but a chunk-list (track/level)\n // We fire the manifest-loaded event anyway with the parsed level-details\n // by creating a single-level structure for it.\n if (type === PlaylistContextType.MANIFEST) {\n const singleLevel = {\n attrs: new AttrList({}),\n bitrate: 0,\n details: levelDetails,\n name: '',\n url\n };\n hls.trigger(Events.MANIFEST_LOADED, {\n levels: [singleLevel],\n audioTracks: [],\n url,\n stats,\n networkDetails,\n sessionData: null,\n sessionKeys: null,\n contentSteering: null,\n startTimeOffset: null,\n variableList: null\n });\n }\n\n // save parsing time\n stats.parsing.end = performance.now();\n\n // extend the context with the new levelDetails property\n context.levelDetails = levelDetails;\n this.handlePlaylistLoaded(levelDetails, response, stats, context, networkDetails, loader);\n }\n handleManifestParsingError(response, context, error, networkDetails, stats) {\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.MANIFEST_PARSING_ERROR,\n fatal: context.type === PlaylistContextType.MANIFEST,\n url: response.url,\n err: error,\n error,\n reason: error.message,\n response,\n context,\n networkDetails,\n stats\n });\n }\n handleNetworkError(context, networkDetails, timeout = false, response, stats) {\n let message = `A network ${timeout ? 'timeout' : 'error' + (response ? ' (status ' + response.code + ')' : '')} occurred while loading ${context.type}`;\n if (context.type === PlaylistContextType.LEVEL) {\n message += `: ${context.level} id: ${context.id}`;\n } else if (context.type === PlaylistContextType.AUDIO_TRACK || context.type === PlaylistContextType.SUBTITLE_TRACK) {\n message += ` id: ${context.id} group-id: \"${context.groupId}\"`;\n }\n const error = new Error(message);\n logger.warn(`[playlist-loader]: ${message}`);\n let details = ErrorDetails.UNKNOWN;\n let fatal = false;\n const loader = this.getInternalLoader(context);\n switch (context.type) {\n case PlaylistContextType.MANIFEST:\n details = timeout ? ErrorDetails.MANIFEST_LOAD_TIMEOUT : ErrorDetails.MANIFEST_LOAD_ERROR;\n fatal = true;\n break;\n case PlaylistContextType.LEVEL:\n details = timeout ? ErrorDetails.LEVEL_LOAD_TIMEOUT : ErrorDetails.LEVEL_LOAD_ERROR;\n fatal = false;\n break;\n case PlaylistContextType.AUDIO_TRACK:\n details = timeout ? ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT : ErrorDetails.AUDIO_TRACK_LOAD_ERROR;\n fatal = false;\n break;\n case PlaylistContextType.SUBTITLE_TRACK:\n details = timeout ? ErrorDetails.SUBTITLE_TRACK_LOAD_TIMEOUT : ErrorDetails.SUBTITLE_LOAD_ERROR;\n fatal = false;\n break;\n }\n if (loader) {\n this.resetInternalLoader(context.type);\n }\n const errorData = {\n type: ErrorTypes.NETWORK_ERROR,\n details,\n fatal,\n url: context.url,\n loader,\n context,\n error,\n networkDetails,\n stats\n };\n if (response) {\n const url = (networkDetails == null ? void 0 : networkDetails.url) || context.url;\n errorData.response = _objectSpread2({\n url,\n data: undefined\n }, response);\n }\n this.hls.trigger(Events.ERROR, errorData);\n }\n handlePlaylistLoaded(levelDetails, response, stats, context, networkDetails, loader) {\n const hls = this.hls;\n const {\n type,\n level,\n id,\n groupId,\n deliveryDirectives\n } = context;\n const url = getResponseUrl(response, context);\n const parent = mapContextToLevelType(context);\n const levelIndex = typeof context.level === 'number' && parent === PlaylistLevelType.MAIN ? level : undefined;\n if (!levelDetails.fragments.length) {\n const _error = new Error('No Segments found in Playlist');\n hls.trigger(Events.ERROR, {\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.LEVEL_EMPTY_ERROR,\n fatal: false,\n url,\n error: _error,\n reason: _error.message,\n response,\n context,\n level: levelIndex,\n parent,\n networkDetails,\n stats\n });\n return;\n }\n if (!levelDetails.targetduration) {\n levelDetails.playlistParsingError = new Error('Missing Target Duration');\n }\n const error = levelDetails.playlistParsingError;\n if (error) {\n hls.trigger(Events.ERROR, {\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.LEVEL_PARSING_ERROR,\n fatal: false,\n url,\n error,\n reason: error.message,\n response,\n context,\n level: levelIndex,\n parent,\n networkDetails,\n stats\n });\n return;\n }\n if (levelDetails.live && loader) {\n if (loader.getCacheAge) {\n levelDetails.ageHeader = loader.getCacheAge() || 0;\n }\n if (!loader.getCacheAge || isNaN(levelDetails.ageHeader)) {\n levelDetails.ageHeader = 0;\n }\n }\n switch (type) {\n case PlaylistContextType.MANIFEST:\n case PlaylistContextType.LEVEL:\n hls.trigger(Events.LEVEL_LOADED, {\n details: levelDetails,\n level: levelIndex || 0,\n id: id || 0,\n stats,\n networkDetails,\n deliveryDirectives\n });\n break;\n case PlaylistContextType.AUDIO_TRACK:\n hls.trigger(Events.AUDIO_TRACK_LOADED, {\n details: levelDetails,\n id: id || 0,\n groupId: groupId || '',\n stats,\n networkDetails,\n deliveryDirectives\n });\n break;\n case PlaylistContextType.SUBTITLE_TRACK:\n hls.trigger(Events.SUBTITLE_TRACK_LOADED, {\n details: levelDetails,\n id: id || 0,\n groupId: groupId || '',\n stats,\n networkDetails,\n deliveryDirectives\n });\n break;\n }\n }\n}\n\nfunction sendAddTrackEvent(track, videoEl) {\n let event;\n try {\n event = new Event('addtrack');\n } catch (err) {\n // for IE11\n event = document.createEvent('Event');\n event.initEvent('addtrack', false, false);\n }\n event.track = track;\n videoEl.dispatchEvent(event);\n}\nfunction addCueToTrack(track, cue) {\n // Sometimes there are cue overlaps on segmented vtts so the same\n // cue can appear more than once in different vtt files.\n // This avoid showing duplicated cues with same timecode and text.\n const mode = track.mode;\n if (mode === 'disabled') {\n track.mode = 'hidden';\n }\n if (track.cues && !track.cues.getCueById(cue.id)) {\n try {\n track.addCue(cue);\n if (!track.cues.getCueById(cue.id)) {\n throw new Error(`addCue is failed for: ${cue}`);\n }\n } catch (err) {\n logger.debug(`[texttrack-utils]: ${err}`);\n try {\n const textTrackCue = new self.TextTrackCue(cue.startTime, cue.endTime, cue.text);\n textTrackCue.id = cue.id;\n track.addCue(textTrackCue);\n } catch (err2) {\n logger.debug(`[texttrack-utils]: Legacy TextTrackCue fallback failed: ${err2}`);\n }\n }\n }\n if (mode === 'disabled') {\n track.mode = mode;\n }\n}\nfunction clearCurrentCues(track) {\n // When track.mode is disabled, track.cues will be null.\n // To guarantee the removal of cues, we need to temporarily\n // change the mode to hidden\n const mode = track.mode;\n if (mode === 'disabled') {\n track.mode = 'hidden';\n }\n if (track.cues) {\n for (let i = track.cues.length; i--;) {\n track.removeCue(track.cues[i]);\n }\n }\n if (mode === 'disabled') {\n track.mode = mode;\n }\n}\nfunction removeCuesInRange(track, start, end, predicate) {\n const mode = track.mode;\n if (mode === 'disabled') {\n track.mode = 'hidden';\n }\n if (track.cues && track.cues.length > 0) {\n const cues = getCuesInRange(track.cues, start, end);\n for (let i = 0; i < cues.length; i++) {\n if (!predicate || predicate(cues[i])) {\n track.removeCue(cues[i]);\n }\n }\n }\n if (mode === 'disabled') {\n track.mode = mode;\n }\n}\n\n// Find first cue starting after given time.\n// Modified version of binary search O(log(n)).\nfunction getFirstCueIndexAfterTime(cues, time) {\n // If first cue starts after time, start there\n if (time < cues[0].startTime) {\n return 0;\n }\n // If the last cue ends before time there is no overlap\n const len = cues.length - 1;\n if (time > cues[len].endTime) {\n return -1;\n }\n let left = 0;\n let right = len;\n while (left <= right) {\n const mid = Math.floor((right + left) / 2);\n if (time < cues[mid].startTime) {\n right = mid - 1;\n } else if (time > cues[mid].startTime && left < len) {\n left = mid + 1;\n } else {\n // If it's not lower or higher, it must be equal.\n return mid;\n }\n }\n // At this point, left and right have swapped.\n // No direct match was found, left or right element must be the closest. Check which one has the smallest diff.\n return cues[left].startTime - time < time - cues[right].startTime ? left : right;\n}\nfunction getCuesInRange(cues, start, end) {\n const cuesFound = [];\n const firstCueInRange = getFirstCueIndexAfterTime(cues, start);\n if (firstCueInRange > -1) {\n for (let i = firstCueInRange, len = cues.length; i < len; i++) {\n const cue = cues[i];\n if (cue.startTime >= start && cue.endTime <= end) {\n cuesFound.push(cue);\n } else if (cue.startTime > end) {\n return cuesFound;\n }\n }\n }\n return cuesFound;\n}\nfunction filterSubtitleTracks(textTrackList) {\n const tracks = [];\n for (let i = 0; i < textTrackList.length; i++) {\n const track = textTrackList[i];\n // Edge adds a track without a label; we don't want to use it\n if ((track.kind === 'subtitles' || track.kind === 'captions') && track.label) {\n tracks.push(textTrackList[i]);\n }\n }\n return tracks;\n}\n\nvar MetadataSchema = {\n audioId3: \"org.id3\",\n dateRange: \"com.apple.quicktime.HLS\",\n emsg: \"https://aomedia.org/emsg/ID3\"\n};\n\nconst MIN_CUE_DURATION = 0.25;\nfunction getCueClass() {\n if (typeof self === 'undefined') return undefined;\n return self.VTTCue || self.TextTrackCue;\n}\nfunction createCueWithDataFields(Cue, startTime, endTime, data, type) {\n let cue = new Cue(startTime, endTime, '');\n try {\n cue.value = data;\n if (type) {\n cue.type = type;\n }\n } catch (e) {\n cue = new Cue(startTime, endTime, JSON.stringify(type ? _objectSpread2({\n type\n }, data) : data));\n }\n return cue;\n}\n\n// VTTCue latest draft allows an infinite duration, fallback\n// to MAX_VALUE if necessary\nconst MAX_CUE_ENDTIME = (() => {\n const Cue = getCueClass();\n try {\n Cue && new Cue(0, Number.POSITIVE_INFINITY, '');\n } catch (e) {\n return Number.MAX_VALUE;\n }\n return Number.POSITIVE_INFINITY;\n})();\nfunction dateRangeDateToTimelineSeconds(date, offset) {\n return date.getTime() / 1000 - offset;\n}\nfunction hexToArrayBuffer(str) {\n return Uint8Array.from(str.replace(/^0x/, '').replace(/([\\da-fA-F]{2}) ?/g, '0x$1 ').replace(/ +$/, '').split(' ')).buffer;\n}\nclass ID3TrackController {\n constructor(hls) {\n this.hls = void 0;\n this.id3Track = null;\n this.media = null;\n this.dateRangeCuesAppended = {};\n this.hls = hls;\n this._registerListeners();\n }\n destroy() {\n this._unregisterListeners();\n this.id3Track = null;\n this.media = null;\n this.dateRangeCuesAppended = {};\n // @ts-ignore\n this.hls = null;\n }\n _registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.FRAG_PARSING_METADATA, this.onFragParsingMetadata, this);\n hls.on(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.on(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n }\n _unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.FRAG_PARSING_METADATA, this.onFragParsingMetadata, this);\n hls.off(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.off(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n }\n\n // Add ID3 metatadata text track.\n onMediaAttached(event, data) {\n this.media = data.media;\n }\n onMediaDetaching() {\n if (!this.id3Track) {\n return;\n }\n clearCurrentCues(this.id3Track);\n this.id3Track = null;\n this.media = null;\n this.dateRangeCuesAppended = {};\n }\n onManifestLoading() {\n this.dateRangeCuesAppended = {};\n }\n createTrack(media) {\n const track = this.getID3Track(media.textTracks);\n track.mode = 'hidden';\n return track;\n }\n getID3Track(textTracks) {\n if (!this.media) {\n return;\n }\n for (let i = 0; i < textTracks.length; i++) {\n const textTrack = textTracks[i];\n if (textTrack.kind === 'metadata' && textTrack.label === 'id3') {\n // send 'addtrack' when reusing the textTrack for metadata,\n // same as what we do for captions\n sendAddTrackEvent(textTrack, this.media);\n return textTrack;\n }\n }\n return this.media.addTextTrack('metadata', 'id3');\n }\n onFragParsingMetadata(event, data) {\n if (!this.media) {\n return;\n }\n const {\n hls: {\n config: {\n enableEmsgMetadataCues,\n enableID3MetadataCues\n }\n }\n } = this;\n if (!enableEmsgMetadataCues && !enableID3MetadataCues) {\n return;\n }\n const {\n samples\n } = data;\n\n // create track dynamically\n if (!this.id3Track) {\n this.id3Track = this.createTrack(this.media);\n }\n const Cue = getCueClass();\n if (!Cue) {\n return;\n }\n for (let i = 0; i < samples.length; i++) {\n const type = samples[i].type;\n if (type === MetadataSchema.emsg && !enableEmsgMetadataCues || !enableID3MetadataCues) {\n continue;\n }\n const frames = getID3Frames(samples[i].data);\n if (frames) {\n const startTime = samples[i].pts;\n let endTime = startTime + samples[i].duration;\n if (endTime > MAX_CUE_ENDTIME) {\n endTime = MAX_CUE_ENDTIME;\n }\n const timeDiff = endTime - startTime;\n if (timeDiff <= 0) {\n endTime = startTime + MIN_CUE_DURATION;\n }\n for (let j = 0; j < frames.length; j++) {\n const frame = frames[j];\n // Safari doesn't put the timestamp frame in the TextTrack\n if (!isTimeStampFrame(frame)) {\n // add a bounds to any unbounded cues\n this.updateId3CueEnds(startTime, type);\n const cue = createCueWithDataFields(Cue, startTime, endTime, frame, type);\n if (cue) {\n this.id3Track.addCue(cue);\n }\n }\n }\n }\n }\n }\n updateId3CueEnds(startTime, type) {\n var _this$id3Track;\n const cues = (_this$id3Track = this.id3Track) == null ? void 0 : _this$id3Track.cues;\n if (cues) {\n for (let i = cues.length; i--;) {\n const cue = cues[i];\n if (cue.type === type && cue.startTime < startTime && cue.endTime === MAX_CUE_ENDTIME) {\n cue.endTime = startTime;\n }\n }\n }\n }\n onBufferFlushing(event, {\n startOffset,\n endOffset,\n type\n }) {\n const {\n id3Track,\n hls\n } = this;\n if (!hls) {\n return;\n }\n const {\n config: {\n enableEmsgMetadataCues,\n enableID3MetadataCues\n }\n } = hls;\n if (id3Track && (enableEmsgMetadataCues || enableID3MetadataCues)) {\n let predicate;\n if (type === 'audio') {\n predicate = cue => cue.type === MetadataSchema.audioId3 && enableID3MetadataCues;\n } else if (type === 'video') {\n predicate = cue => cue.type === MetadataSchema.emsg && enableEmsgMetadataCues;\n } else {\n predicate = cue => cue.type === MetadataSchema.audioId3 && enableID3MetadataCues || cue.type === MetadataSchema.emsg && enableEmsgMetadataCues;\n }\n removeCuesInRange(id3Track, startOffset, endOffset, predicate);\n }\n }\n onLevelUpdated(event, {\n details\n }) {\n if (!this.media || !details.hasProgramDateTime || !this.hls.config.enableDateRangeMetadataCues) {\n return;\n }\n const {\n dateRangeCuesAppended,\n id3Track\n } = this;\n const {\n dateRanges\n } = details;\n const ids = Object.keys(dateRanges);\n // Remove cues from track not found in details.dateRanges\n if (id3Track) {\n const idsToRemove = Object.keys(dateRangeCuesAppended).filter(id => !ids.includes(id));\n for (let i = idsToRemove.length; i--;) {\n const id = idsToRemove[i];\n Object.keys(dateRangeCuesAppended[id].cues).forEach(key => {\n id3Track.removeCue(dateRangeCuesAppended[id].cues[key]);\n });\n delete dateRangeCuesAppended[id];\n }\n }\n // Exit if the playlist does not have Date Ranges or does not have Program Date Time\n const lastFragment = details.fragments[details.fragments.length - 1];\n if (ids.length === 0 || !isFiniteNumber(lastFragment == null ? void 0 : lastFragment.programDateTime)) {\n return;\n }\n if (!this.id3Track) {\n this.id3Track = this.createTrack(this.media);\n }\n const dateTimeOffset = lastFragment.programDateTime / 1000 - lastFragment.start;\n const Cue = getCueClass();\n for (let i = 0; i < ids.length; i++) {\n const id = ids[i];\n const dateRange = dateRanges[id];\n const startTime = dateRangeDateToTimelineSeconds(dateRange.startDate, dateTimeOffset);\n\n // Process DateRanges to determine end-time (known DURATION, END-DATE, or END-ON-NEXT)\n const appendedDateRangeCues = dateRangeCuesAppended[id];\n const cues = (appendedDateRangeCues == null ? void 0 : appendedDateRangeCues.cues) || {};\n let durationKnown = (appendedDateRangeCues == null ? void 0 : appendedDateRangeCues.durationKnown) || false;\n let endTime = MAX_CUE_ENDTIME;\n const endDate = dateRange.endDate;\n if (endDate) {\n endTime = dateRangeDateToTimelineSeconds(endDate, dateTimeOffset);\n durationKnown = true;\n } else if (dateRange.endOnNext && !durationKnown) {\n const nextDateRangeWithSameClass = ids.reduce((candidateDateRange, id) => {\n if (id !== dateRange.id) {\n const otherDateRange = dateRanges[id];\n if (otherDateRange.class === dateRange.class && otherDateRange.startDate > dateRange.startDate && (!candidateDateRange || dateRange.startDate < candidateDateRange.startDate)) {\n return otherDateRange;\n }\n }\n return candidateDateRange;\n }, null);\n if (nextDateRangeWithSameClass) {\n endTime = dateRangeDateToTimelineSeconds(nextDateRangeWithSameClass.startDate, dateTimeOffset);\n durationKnown = true;\n }\n }\n\n // Create TextTrack Cues for each MetadataGroup Item (select DateRange attribute)\n // This is to emulate Safari HLS playback handling of DateRange tags\n const attributes = Object.keys(dateRange.attr);\n for (let j = 0; j < attributes.length; j++) {\n const key = attributes[j];\n if (!isDateRangeCueAttribute(key)) {\n continue;\n }\n const cue = cues[key];\n if (cue) {\n if (durationKnown && !appendedDateRangeCues.durationKnown) {\n cue.endTime = endTime;\n }\n } else if (Cue) {\n let data = dateRange.attr[key];\n if (isSCTE35Attribute(key)) {\n data = hexToArrayBuffer(data);\n }\n const _cue = createCueWithDataFields(Cue, startTime, endTime, {\n key,\n data\n }, MetadataSchema.dateRange);\n if (_cue) {\n _cue.id = id;\n this.id3Track.addCue(_cue);\n cues[key] = _cue;\n }\n }\n }\n\n // Keep track of processed DateRanges by ID for updating cues with new DateRange tag attributes\n dateRangeCuesAppended[id] = {\n cues,\n dateRange,\n durationKnown\n };\n }\n }\n}\n\nclass LatencyController {\n constructor(hls) {\n this.hls = void 0;\n this.config = void 0;\n this.media = null;\n this.levelDetails = null;\n this.currentTime = 0;\n this.stallCount = 0;\n this._latency = null;\n this.timeupdateHandler = () => this.timeupdate();\n this.hls = hls;\n this.config = hls.config;\n this.registerListeners();\n }\n get latency() {\n return this._latency || 0;\n }\n get maxLatency() {\n const {\n config,\n levelDetails\n } = this;\n if (config.liveMaxLatencyDuration !== undefined) {\n return config.liveMaxLatencyDuration;\n }\n return levelDetails ? config.liveMaxLatencyDurationCount * levelDetails.targetduration : 0;\n }\n get targetLatency() {\n const {\n levelDetails\n } = this;\n if (levelDetails === null) {\n return null;\n }\n const {\n holdBack,\n partHoldBack,\n targetduration\n } = levelDetails;\n const {\n liveSyncDuration,\n liveSyncDurationCount,\n lowLatencyMode\n } = this.config;\n const userConfig = this.hls.userConfig;\n let targetLatency = lowLatencyMode ? partHoldBack || holdBack : holdBack;\n if (userConfig.liveSyncDuration || userConfig.liveSyncDurationCount || targetLatency === 0) {\n targetLatency = liveSyncDuration !== undefined ? liveSyncDuration : liveSyncDurationCount * targetduration;\n }\n const maxLiveSyncOnStallIncrease = targetduration;\n const liveSyncOnStallIncrease = 1.0;\n return targetLatency + Math.min(this.stallCount * liveSyncOnStallIncrease, maxLiveSyncOnStallIncrease);\n }\n get liveSyncPosition() {\n const liveEdge = this.estimateLiveEdge();\n const targetLatency = this.targetLatency;\n const levelDetails = this.levelDetails;\n if (liveEdge === null || targetLatency === null || levelDetails === null) {\n return null;\n }\n const edge = levelDetails.edge;\n const syncPosition = liveEdge - targetLatency - this.edgeStalled;\n const min = edge - levelDetails.totalduration;\n const max = edge - (this.config.lowLatencyMode && levelDetails.partTarget || levelDetails.targetduration);\n return Math.min(Math.max(min, syncPosition), max);\n }\n get drift() {\n const {\n levelDetails\n } = this;\n if (levelDetails === null) {\n return 1;\n }\n return levelDetails.drift;\n }\n get edgeStalled() {\n const {\n levelDetails\n } = this;\n if (levelDetails === null) {\n return 0;\n }\n const maxLevelUpdateAge = (this.config.lowLatencyMode && levelDetails.partTarget || levelDetails.targetduration) * 3;\n return Math.max(levelDetails.age - maxLevelUpdateAge, 0);\n }\n get forwardBufferLength() {\n const {\n media,\n levelDetails\n } = this;\n if (!media || !levelDetails) {\n return 0;\n }\n const bufferedRanges = media.buffered.length;\n return (bufferedRanges ? media.buffered.end(bufferedRanges - 1) : levelDetails.edge) - this.currentTime;\n }\n destroy() {\n this.unregisterListeners();\n this.onMediaDetaching();\n this.levelDetails = null;\n // @ts-ignore\n this.hls = this.timeupdateHandler = null;\n }\n registerListeners() {\n this.hls.on(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n this.hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n this.hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n this.hls.on(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n this.hls.on(Events.ERROR, this.onError, this);\n }\n unregisterListeners() {\n this.hls.off(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n this.hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n this.hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n this.hls.off(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n this.hls.off(Events.ERROR, this.onError, this);\n }\n onMediaAttached(event, data) {\n this.media = data.media;\n this.media.addEventListener('timeupdate', this.timeupdateHandler);\n }\n onMediaDetaching() {\n if (this.media) {\n this.media.removeEventListener('timeupdate', this.timeupdateHandler);\n this.media = null;\n }\n }\n onManifestLoading() {\n this.levelDetails = null;\n this._latency = null;\n this.stallCount = 0;\n }\n onLevelUpdated(event, {\n details\n }) {\n this.levelDetails = details;\n if (details.advanced) {\n this.timeupdate();\n }\n if (!details.live && this.media) {\n this.media.removeEventListener('timeupdate', this.timeupdateHandler);\n }\n }\n onError(event, data) {\n var _this$levelDetails;\n if (data.details !== ErrorDetails.BUFFER_STALLED_ERROR) {\n return;\n }\n this.stallCount++;\n if ((_this$levelDetails = this.levelDetails) != null && _this$levelDetails.live) {\n logger.warn('[playback-rate-controller]: Stall detected, adjusting target latency');\n }\n }\n timeupdate() {\n const {\n media,\n levelDetails\n } = this;\n if (!media || !levelDetails) {\n return;\n }\n this.currentTime = media.currentTime;\n const latency = this.computeLatency();\n if (latency === null) {\n return;\n }\n this._latency = latency;\n\n // Adapt playbackRate to meet target latency in low-latency mode\n const {\n lowLatencyMode,\n maxLiveSyncPlaybackRate\n } = this.config;\n if (!lowLatencyMode || maxLiveSyncPlaybackRate === 1 || !levelDetails.live) {\n return;\n }\n const targetLatency = this.targetLatency;\n if (targetLatency === null) {\n return;\n }\n const distanceFromTarget = latency - targetLatency;\n // Only adjust playbackRate when within one target duration of targetLatency\n // and more than one second from under-buffering.\n // Playback further than one target duration from target can be considered DVR playback.\n const liveMinLatencyDuration = Math.min(this.maxLatency, targetLatency + levelDetails.targetduration);\n const inLiveRange = distanceFromTarget < liveMinLatencyDuration;\n if (inLiveRange && distanceFromTarget > 0.05 && this.forwardBufferLength > 1) {\n const max = Math.min(2, Math.max(1.0, maxLiveSyncPlaybackRate));\n const rate = Math.round(2 / (1 + Math.exp(-0.75 * distanceFromTarget - this.edgeStalled)) * 20) / 20;\n media.playbackRate = Math.min(max, Math.max(1, rate));\n } else if (media.playbackRate !== 1 && media.playbackRate !== 0) {\n media.playbackRate = 1;\n }\n }\n estimateLiveEdge() {\n const {\n levelDetails\n } = this;\n if (levelDetails === null) {\n return null;\n }\n return levelDetails.edge + levelDetails.age;\n }\n computeLatency() {\n const liveEdge = this.estimateLiveEdge();\n if (liveEdge === null) {\n return null;\n }\n return liveEdge - this.currentTime;\n }\n}\n\nconst HdcpLevels = ['NONE', 'TYPE-0', 'TYPE-1', null];\nfunction isHdcpLevel(value) {\n return HdcpLevels.indexOf(value) > -1;\n}\nconst VideoRangeValues = ['SDR', 'PQ', 'HLG'];\nfunction isVideoRange(value) {\n return !!value && VideoRangeValues.indexOf(value) > -1;\n}\nvar HlsSkip = {\n No: \"\",\n Yes: \"YES\",\n v2: \"v2\"\n};\nfunction getSkipValue(details) {\n const {\n canSkipUntil,\n canSkipDateRanges,\n age\n } = details;\n // A Client SHOULD NOT request a Playlist Delta Update unless it already\n // has a version of the Playlist that is no older than one-half of the Skip Boundary.\n // @see: https://datatracker.ietf.org/doc/html/draft-pantos-hls-rfc8216bis#section-6.3.7\n const playlistRecentEnough = age < canSkipUntil / 2;\n if (canSkipUntil && playlistRecentEnough) {\n if (canSkipDateRanges) {\n return HlsSkip.v2;\n }\n return HlsSkip.Yes;\n }\n return HlsSkip.No;\n}\nclass HlsUrlParameters {\n constructor(msn, part, skip) {\n this.msn = void 0;\n this.part = void 0;\n this.skip = void 0;\n this.msn = msn;\n this.part = part;\n this.skip = skip;\n }\n addDirectives(uri) {\n const url = new self.URL(uri);\n if (this.msn !== undefined) {\n url.searchParams.set('_HLS_msn', this.msn.toString());\n }\n if (this.part !== undefined) {\n url.searchParams.set('_HLS_part', this.part.toString());\n }\n if (this.skip) {\n url.searchParams.set('_HLS_skip', this.skip);\n }\n return url.href;\n }\n}\nclass Level {\n constructor(data) {\n this._attrs = void 0;\n this.audioCodec = void 0;\n this.bitrate = void 0;\n this.codecSet = void 0;\n this.url = void 0;\n this.frameRate = void 0;\n this.height = void 0;\n this.id = void 0;\n this.name = void 0;\n this.videoCodec = void 0;\n this.width = void 0;\n this.details = void 0;\n this.fragmentError = 0;\n this.loadError = 0;\n this.loaded = void 0;\n this.realBitrate = 0;\n this.supportedPromise = void 0;\n this.supportedResult = void 0;\n this._avgBitrate = 0;\n this._audioGroups = void 0;\n this._subtitleGroups = void 0;\n // Deprecated (retained for backwards compatibility)\n this._urlId = 0;\n this.url = [data.url];\n this._attrs = [data.attrs];\n this.bitrate = data.bitrate;\n if (data.details) {\n this.details = data.details;\n }\n this.id = data.id || 0;\n this.name = data.name;\n this.width = data.width || 0;\n this.height = data.height || 0;\n this.frameRate = data.attrs.optionalFloat('FRAME-RATE', 0);\n this._avgBitrate = data.attrs.decimalInteger('AVERAGE-BANDWIDTH');\n this.audioCodec = data.audioCodec;\n this.videoCodec = data.videoCodec;\n this.codecSet = [data.videoCodec, data.audioCodec].filter(c => !!c).map(s => s.substring(0, 4)).join(',');\n this.addGroupId('audio', data.attrs.AUDIO);\n this.addGroupId('text', data.attrs.SUBTITLES);\n }\n get maxBitrate() {\n return Math.max(this.realBitrate, this.bitrate);\n }\n get averageBitrate() {\n return this._avgBitrate || this.realBitrate || this.bitrate;\n }\n get attrs() {\n return this._attrs[0];\n }\n get codecs() {\n return this.attrs.CODECS || '';\n }\n get pathwayId() {\n return this.attrs['PATHWAY-ID'] || '.';\n }\n get videoRange() {\n return this.attrs['VIDEO-RANGE'] || 'SDR';\n }\n get score() {\n return this.attrs.optionalFloat('SCORE', 0);\n }\n get uri() {\n return this.url[0] || '';\n }\n hasAudioGroup(groupId) {\n return hasGroup(this._audioGroups, groupId);\n }\n hasSubtitleGroup(groupId) {\n return hasGroup(this._subtitleGroups, groupId);\n }\n get audioGroups() {\n return this._audioGroups;\n }\n get subtitleGroups() {\n return this._subtitleGroups;\n }\n addGroupId(type, groupId) {\n if (!groupId) {\n return;\n }\n if (type === 'audio') {\n let audioGroups = this._audioGroups;\n if (!audioGroups) {\n audioGroups = this._audioGroups = [];\n }\n if (audioGroups.indexOf(groupId) === -1) {\n audioGroups.push(groupId);\n }\n } else if (type === 'text') {\n let subtitleGroups = this._subtitleGroups;\n if (!subtitleGroups) {\n subtitleGroups = this._subtitleGroups = [];\n }\n if (subtitleGroups.indexOf(groupId) === -1) {\n subtitleGroups.push(groupId);\n }\n }\n }\n\n // Deprecated methods (retained for backwards compatibility)\n get urlId() {\n return 0;\n }\n set urlId(value) {}\n get audioGroupIds() {\n return this.audioGroups ? [this.audioGroupId] : undefined;\n }\n get textGroupIds() {\n return this.subtitleGroups ? [this.textGroupId] : undefined;\n }\n get audioGroupId() {\n var _this$audioGroups;\n return (_this$audioGroups = this.audioGroups) == null ? void 0 : _this$audioGroups[0];\n }\n get textGroupId() {\n var _this$subtitleGroups;\n return (_this$subtitleGroups = this.subtitleGroups) == null ? void 0 : _this$subtitleGroups[0];\n }\n addFallback() {}\n}\nfunction hasGroup(groups, groupId) {\n if (!groupId || !groups) {\n return false;\n }\n return groups.indexOf(groupId) !== -1;\n}\n\nfunction updateFromToPTS(fragFrom, fragTo) {\n const fragToPTS = fragTo.startPTS;\n // if we know startPTS[toIdx]\n if (isFiniteNumber(fragToPTS)) {\n // update fragment duration.\n // it helps to fix drifts between playlist reported duration and fragment real duration\n let duration = 0;\n let frag;\n if (fragTo.sn > fragFrom.sn) {\n duration = fragToPTS - fragFrom.start;\n frag = fragFrom;\n } else {\n duration = fragFrom.start - fragToPTS;\n frag = fragTo;\n }\n if (frag.duration !== duration) {\n frag.duration = duration;\n }\n // we dont know startPTS[toIdx]\n } else if (fragTo.sn > fragFrom.sn) {\n const contiguous = fragFrom.cc === fragTo.cc;\n // TODO: With part-loading end/durations we need to confirm the whole fragment is loaded before using (or setting) minEndPTS\n if (contiguous && fragFrom.minEndPTS) {\n fragTo.start = fragFrom.start + (fragFrom.minEndPTS - fragFrom.start);\n } else {\n fragTo.start = fragFrom.start + fragFrom.duration;\n }\n } else {\n fragTo.start = Math.max(fragFrom.start - fragTo.duration, 0);\n }\n}\nfunction updateFragPTSDTS(details, frag, startPTS, endPTS, startDTS, endDTS) {\n const parsedMediaDuration = endPTS - startPTS;\n if (parsedMediaDuration <= 0) {\n logger.warn('Fragment should have a positive duration', frag);\n endPTS = startPTS + frag.duration;\n endDTS = startDTS + frag.duration;\n }\n let maxStartPTS = startPTS;\n let minEndPTS = endPTS;\n const fragStartPts = frag.startPTS;\n const fragEndPts = frag.endPTS;\n if (isFiniteNumber(fragStartPts)) {\n // delta PTS between audio and video\n const deltaPTS = Math.abs(fragStartPts - startPTS);\n if (!isFiniteNumber(frag.deltaPTS)) {\n frag.deltaPTS = deltaPTS;\n } else {\n frag.deltaPTS = Math.max(deltaPTS, frag.deltaPTS);\n }\n maxStartPTS = Math.max(startPTS, fragStartPts);\n startPTS = Math.min(startPTS, fragStartPts);\n startDTS = Math.min(startDTS, frag.startDTS);\n minEndPTS = Math.min(endPTS, fragEndPts);\n endPTS = Math.max(endPTS, fragEndPts);\n endDTS = Math.max(endDTS, frag.endDTS);\n }\n const drift = startPTS - frag.start;\n if (frag.start !== 0) {\n frag.start = startPTS;\n }\n frag.duration = endPTS - frag.start;\n frag.startPTS = startPTS;\n frag.maxStartPTS = maxStartPTS;\n frag.startDTS = startDTS;\n frag.endPTS = endPTS;\n frag.minEndPTS = minEndPTS;\n frag.endDTS = endDTS;\n const sn = frag.sn; // 'initSegment'\n // exit if sn out of range\n if (!details || sn < details.startSN || sn > details.endSN) {\n return 0;\n }\n let i;\n const fragIdx = sn - details.startSN;\n const fragments = details.fragments;\n // update frag reference in fragments array\n // rationale is that fragments array might not contain this frag object.\n // this will happen if playlist has been refreshed between frag loading and call to updateFragPTSDTS()\n // if we don't update frag, we won't be able to propagate PTS info on the playlist\n // resulting in invalid sliding computation\n fragments[fragIdx] = frag;\n // adjust fragment PTS/duration from seqnum-1 to frag 0\n for (i = fragIdx; i > 0; i--) {\n updateFromToPTS(fragments[i], fragments[i - 1]);\n }\n\n // adjust fragment PTS/duration from seqnum to last frag\n for (i = fragIdx; i < fragments.length - 1; i++) {\n updateFromToPTS(fragments[i], fragments[i + 1]);\n }\n if (details.fragmentHint) {\n updateFromToPTS(fragments[fragments.length - 1], details.fragmentHint);\n }\n details.PTSKnown = details.alignedSliding = true;\n return drift;\n}\nfunction mergeDetails(oldDetails, newDetails) {\n // Track the last initSegment processed. Initialize it to the last one on the timeline.\n let currentInitSegment = null;\n const oldFragments = oldDetails.fragments;\n for (let i = oldFragments.length - 1; i >= 0; i--) {\n const oldInit = oldFragments[i].initSegment;\n if (oldInit) {\n currentInitSegment = oldInit;\n break;\n }\n }\n if (oldDetails.fragmentHint) {\n // prevent PTS and duration from being adjusted on the next hint\n delete oldDetails.fragmentHint.endPTS;\n }\n // check if old/new playlists have fragments in common\n // loop through overlapping SN and update startPTS , cc, and duration if any found\n let ccOffset = 0;\n let PTSFrag;\n mapFragmentIntersection(oldDetails, newDetails, (oldFrag, newFrag) => {\n if (oldFrag.relurl) {\n // Do not compare CC if the old fragment has no url. This is a level.fragmentHint used by LL-HLS parts.\n // It maybe be off by 1 if it was created before any parts or discontinuity tags were appended to the end\n // of the playlist.\n ccOffset = oldFrag.cc - newFrag.cc;\n }\n if (isFiniteNumber(oldFrag.startPTS) && isFiniteNumber(oldFrag.endPTS)) {\n newFrag.start = newFrag.startPTS = oldFrag.startPTS;\n newFrag.startDTS = oldFrag.startDTS;\n newFrag.maxStartPTS = oldFrag.maxStartPTS;\n newFrag.endPTS = oldFrag.endPTS;\n newFrag.endDTS = oldFrag.endDTS;\n newFrag.minEndPTS = oldFrag.minEndPTS;\n newFrag.duration = oldFrag.endPTS - oldFrag.startPTS;\n if (newFrag.duration) {\n PTSFrag = newFrag;\n }\n\n // PTS is known when any segment has startPTS and endPTS\n newDetails.PTSKnown = newDetails.alignedSliding = true;\n }\n newFrag.elementaryStreams = oldFrag.elementaryStreams;\n newFrag.loader = oldFrag.loader;\n newFrag.stats = oldFrag.stats;\n if (oldFrag.initSegment) {\n newFrag.initSegment = oldFrag.initSegment;\n currentInitSegment = oldFrag.initSegment;\n }\n });\n if (currentInitSegment) {\n const fragmentsToCheck = newDetails.fragmentHint ? newDetails.fragments.concat(newDetails.fragmentHint) : newDetails.fragments;\n fragmentsToCheck.forEach(frag => {\n var _currentInitSegment;\n if (frag && (!frag.initSegment || frag.initSegment.relurl === ((_currentInitSegment = currentInitSegment) == null ? void 0 : _currentInitSegment.relurl))) {\n frag.initSegment = currentInitSegment;\n }\n });\n }\n if (newDetails.skippedSegments) {\n newDetails.deltaUpdateFailed = newDetails.fragments.some(frag => !frag);\n if (newDetails.deltaUpdateFailed) {\n logger.warn('[level-helper] Previous playlist missing segments skipped in delta playlist');\n for (let i = newDetails.skippedSegments; i--;) {\n newDetails.fragments.shift();\n }\n newDetails.startSN = newDetails.fragments[0].sn;\n newDetails.startCC = newDetails.fragments[0].cc;\n } else if (newDetails.canSkipDateRanges) {\n newDetails.dateRanges = mergeDateRanges(oldDetails.dateRanges, newDetails.dateRanges, newDetails.recentlyRemovedDateranges);\n }\n }\n const newFragments = newDetails.fragments;\n if (ccOffset) {\n logger.warn('discontinuity sliding from playlist, take drift into account');\n for (let i = 0; i < newFragments.length; i++) {\n newFragments[i].cc += ccOffset;\n }\n }\n if (newDetails.skippedSegments) {\n newDetails.startCC = newDetails.fragments[0].cc;\n }\n\n // Merge parts\n mapPartIntersection(oldDetails.partList, newDetails.partList, (oldPart, newPart) => {\n newPart.elementaryStreams = oldPart.elementaryStreams;\n newPart.stats = oldPart.stats;\n });\n\n // if at least one fragment contains PTS info, recompute PTS information for all fragments\n if (PTSFrag) {\n updateFragPTSDTS(newDetails, PTSFrag, PTSFrag.startPTS, PTSFrag.endPTS, PTSFrag.startDTS, PTSFrag.endDTS);\n } else {\n // ensure that delta is within oldFragments range\n // also adjust sliding in case delta is 0 (we could have old=[50-60] and new=old=[50-61])\n // in that case we also need to adjust start offset of all fragments\n adjustSliding(oldDetails, newDetails);\n }\n if (newFragments.length) {\n newDetails.totalduration = newDetails.edge - newFragments[0].start;\n }\n newDetails.driftStartTime = oldDetails.driftStartTime;\n newDetails.driftStart = oldDetails.driftStart;\n const advancedDateTime = newDetails.advancedDateTime;\n if (newDetails.advanced && advancedDateTime) {\n const edge = newDetails.edge;\n if (!newDetails.driftStart) {\n newDetails.driftStartTime = advancedDateTime;\n newDetails.driftStart = edge;\n }\n newDetails.driftEndTime = advancedDateTime;\n newDetails.driftEnd = edge;\n } else {\n newDetails.driftEndTime = oldDetails.driftEndTime;\n newDetails.driftEnd = oldDetails.driftEnd;\n newDetails.advancedDateTime = oldDetails.advancedDateTime;\n }\n}\nfunction mergeDateRanges(oldDateRanges, deltaDateRanges, recentlyRemovedDateranges) {\n const dateRanges = _extends({}, oldDateRanges);\n if (recentlyRemovedDateranges) {\n recentlyRemovedDateranges.forEach(id => {\n delete dateRanges[id];\n });\n }\n Object.keys(deltaDateRanges).forEach(id => {\n const dateRange = new DateRange(deltaDateRanges[id].attr, dateRanges[id]);\n if (dateRange.isValid) {\n dateRanges[id] = dateRange;\n } else {\n logger.warn(`Ignoring invalid Playlist Delta Update DATERANGE tag: \"${JSON.stringify(deltaDateRanges[id].attr)}\"`);\n }\n });\n return dateRanges;\n}\nfunction mapPartIntersection(oldParts, newParts, intersectionFn) {\n if (oldParts && newParts) {\n let delta = 0;\n for (let i = 0, len = oldParts.length; i <= len; i++) {\n const oldPart = oldParts[i];\n const newPart = newParts[i + delta];\n if (oldPart && newPart && oldPart.index === newPart.index && oldPart.fragment.sn === newPart.fragment.sn) {\n intersectionFn(oldPart, newPart);\n } else {\n delta--;\n }\n }\n }\n}\nfunction mapFragmentIntersection(oldDetails, newDetails, intersectionFn) {\n const skippedSegments = newDetails.skippedSegments;\n const start = Math.max(oldDetails.startSN, newDetails.startSN) - newDetails.startSN;\n const end = (oldDetails.fragmentHint ? 1 : 0) + (skippedSegments ? newDetails.endSN : Math.min(oldDetails.endSN, newDetails.endSN)) - newDetails.startSN;\n const delta = newDetails.startSN - oldDetails.startSN;\n const newFrags = newDetails.fragmentHint ? newDetails.fragments.concat(newDetails.fragmentHint) : newDetails.fragments;\n const oldFrags = oldDetails.fragmentHint ? oldDetails.fragments.concat(oldDetails.fragmentHint) : oldDetails.fragments;\n for (let i = start; i <= end; i++) {\n const oldFrag = oldFrags[delta + i];\n let newFrag = newFrags[i];\n if (skippedSegments && !newFrag && i < skippedSegments) {\n // Fill in skipped segments in delta playlist\n newFrag = newDetails.fragments[i] = oldFrag;\n }\n if (oldFrag && newFrag) {\n intersectionFn(oldFrag, newFrag);\n }\n }\n}\nfunction adjustSliding(oldDetails, newDetails) {\n const delta = newDetails.startSN + newDetails.skippedSegments - oldDetails.startSN;\n const oldFragments = oldDetails.fragments;\n if (delta < 0 || delta >= oldFragments.length) {\n return;\n }\n addSliding(newDetails, oldFragments[delta].start);\n}\nfunction addSliding(details, start) {\n if (start) {\n const fragments = details.fragments;\n for (let i = details.skippedSegments; i < fragments.length; i++) {\n fragments[i].start += start;\n }\n if (details.fragmentHint) {\n details.fragmentHint.start += start;\n }\n }\n}\nfunction computeReloadInterval(newDetails, distanceToLiveEdgeMs = Infinity) {\n let reloadInterval = 1000 * newDetails.targetduration;\n if (newDetails.updated) {\n // Use last segment duration when shorter than target duration and near live edge\n const fragments = newDetails.fragments;\n const liveEdgeMaxTargetDurations = 4;\n if (fragments.length && reloadInterval * liveEdgeMaxTargetDurations > distanceToLiveEdgeMs) {\n const lastSegmentDuration = fragments[fragments.length - 1].duration * 1000;\n if (lastSegmentDuration < reloadInterval) {\n reloadInterval = lastSegmentDuration;\n }\n }\n } else {\n // estimate = 'miss half average';\n // follow HLS Spec, If the client reloads a Playlist file and finds that it has not\n // changed then it MUST wait for a period of one-half the target\n // duration before retrying.\n reloadInterval /= 2;\n }\n return Math.round(reloadInterval);\n}\nfunction getFragmentWithSN(level, sn, fragCurrent) {\n if (!(level != null && level.details)) {\n return null;\n }\n const levelDetails = level.details;\n let fragment = levelDetails.fragments[sn - levelDetails.startSN];\n if (fragment) {\n return fragment;\n }\n fragment = levelDetails.fragmentHint;\n if (fragment && fragment.sn === sn) {\n return fragment;\n }\n if (sn < levelDetails.startSN && fragCurrent && fragCurrent.sn === sn) {\n return fragCurrent;\n }\n return null;\n}\nfunction getPartWith(level, sn, partIndex) {\n var _level$details;\n if (!(level != null && level.details)) {\n return null;\n }\n return findPart((_level$details = level.details) == null ? void 0 : _level$details.partList, sn, partIndex);\n}\nfunction findPart(partList, sn, partIndex) {\n if (partList) {\n for (let i = partList.length; i--;) {\n const part = partList[i];\n if (part.index === partIndex && part.fragment.sn === sn) {\n return part;\n }\n }\n }\n return null;\n}\nfunction reassignFragmentLevelIndexes(levels) {\n levels.forEach((level, index) => {\n const {\n details\n } = level;\n if (details != null && details.fragments) {\n details.fragments.forEach(fragment => {\n fragment.level = index;\n });\n }\n });\n}\n\nfunction isTimeoutError(error) {\n switch (error.details) {\n case ErrorDetails.FRAG_LOAD_TIMEOUT:\n case ErrorDetails.KEY_LOAD_TIMEOUT:\n case ErrorDetails.LEVEL_LOAD_TIMEOUT:\n case ErrorDetails.MANIFEST_LOAD_TIMEOUT:\n return true;\n }\n return false;\n}\nfunction getRetryConfig(loadPolicy, error) {\n const isTimeout = isTimeoutError(error);\n return loadPolicy.default[`${isTimeout ? 'timeout' : 'error'}Retry`];\n}\nfunction getRetryDelay(retryConfig, retryCount) {\n // exponential backoff capped to max retry delay\n const backoffFactor = retryConfig.backoff === 'linear' ? 1 : Math.pow(2, retryCount);\n return Math.min(backoffFactor * retryConfig.retryDelayMs, retryConfig.maxRetryDelayMs);\n}\nfunction getLoaderConfigWithoutReties(loderConfig) {\n return _objectSpread2(_objectSpread2({}, loderConfig), {\n errorRetry: null,\n timeoutRetry: null\n });\n}\nfunction shouldRetry(retryConfig, retryCount, isTimeout, loaderResponse) {\n if (!retryConfig) {\n return false;\n }\n const httpStatus = loaderResponse == null ? void 0 : loaderResponse.code;\n const retry = retryCount < retryConfig.maxNumRetry && (retryForHttpStatus(httpStatus) || !!isTimeout);\n return retryConfig.shouldRetry ? retryConfig.shouldRetry(retryConfig, retryCount, isTimeout, loaderResponse, retry) : retry;\n}\nfunction retryForHttpStatus(httpStatus) {\n // Do not retry on status 4xx, status 0 (CORS error), or undefined (decrypt/gap/parse error)\n return httpStatus === 0 && navigator.onLine === false || !!httpStatus && (httpStatus < 400 || httpStatus > 499);\n}\n\nconst BinarySearch = {\n /**\n * Searches for an item in an array which matches a certain condition.\n * This requires the condition to only match one item in the array,\n * and for the array to be ordered.\n *\n * @param list The array to search.\n * @param comparisonFn\n * Called and provided a candidate item as the first argument.\n * Should return:\n * > -1 if the item should be located at a lower index than the provided item.\n * > 1 if the item should be located at a higher index than the provided item.\n * > 0 if the item is the item you're looking for.\n *\n * @returns the object if found, otherwise returns null\n */\n search: function (list, comparisonFn) {\n let minIndex = 0;\n let maxIndex = list.length - 1;\n let currentIndex = null;\n let currentElement = null;\n while (minIndex <= maxIndex) {\n currentIndex = (minIndex + maxIndex) / 2 | 0;\n currentElement = list[currentIndex];\n const comparisonResult = comparisonFn(currentElement);\n if (comparisonResult > 0) {\n minIndex = currentIndex + 1;\n } else if (comparisonResult < 0) {\n maxIndex = currentIndex - 1;\n } else {\n return currentElement;\n }\n }\n return null;\n }\n};\n\n/**\n * Returns first fragment whose endPdt value exceeds the given PDT, or null.\n * @param fragments - The array of candidate fragments\n * @param PDTValue - The PDT value which must be exceeded\n * @param maxFragLookUpTolerance - The amount of time that a fragment's start/end can be within in order to be considered contiguous\n */\nfunction findFragmentByPDT(fragments, PDTValue, maxFragLookUpTolerance) {\n if (PDTValue === null || !Array.isArray(fragments) || !fragments.length || !isFiniteNumber(PDTValue)) {\n return null;\n }\n\n // if less than start\n const startPDT = fragments[0].programDateTime;\n if (PDTValue < (startPDT || 0)) {\n return null;\n }\n const endPDT = fragments[fragments.length - 1].endProgramDateTime;\n if (PDTValue >= (endPDT || 0)) {\n return null;\n }\n maxFragLookUpTolerance = maxFragLookUpTolerance || 0;\n for (let seg = 0; seg < fragments.length; ++seg) {\n const frag = fragments[seg];\n if (pdtWithinToleranceTest(PDTValue, maxFragLookUpTolerance, frag)) {\n return frag;\n }\n }\n return null;\n}\n\n/**\n * Finds a fragment based on the SN of the previous fragment; or based on the needs of the current buffer.\n * This method compensates for small buffer gaps by applying a tolerance to the start of any candidate fragment, thus\n * breaking any traps which would cause the same fragment to be continuously selected within a small range.\n * @param fragPrevious - The last frag successfully appended\n * @param fragments - The array of candidate fragments\n * @param bufferEnd - The end of the contiguous buffered range the playhead is currently within\n * @param maxFragLookUpTolerance - The amount of time that a fragment's start/end can be within in order to be considered contiguous\n * @returns a matching fragment or null\n */\nfunction findFragmentByPTS(fragPrevious, fragments, bufferEnd = 0, maxFragLookUpTolerance = 0, nextFragLookupTolerance = 0.005) {\n let fragNext = null;\n if (fragPrevious) {\n fragNext = fragments[fragPrevious.sn - fragments[0].sn + 1] || null;\n // check for buffer-end rounding error\n const bufferEdgeError = fragPrevious.endDTS - bufferEnd;\n if (bufferEdgeError > 0 && bufferEdgeError < 0.0000015) {\n bufferEnd += 0.0000015;\n }\n } else if (bufferEnd === 0 && fragments[0].start === 0) {\n fragNext = fragments[0];\n }\n // Prefer the next fragment if it's within tolerance\n if (fragNext && ((!fragPrevious || fragPrevious.level === fragNext.level) && fragmentWithinToleranceTest(bufferEnd, maxFragLookUpTolerance, fragNext) === 0 || fragmentWithinFastStartSwitch(fragNext, fragPrevious, Math.min(nextFragLookupTolerance, maxFragLookUpTolerance)))) {\n return fragNext;\n }\n // We might be seeking past the tolerance so find the best match\n const foundFragment = BinarySearch.search(fragments, fragmentWithinToleranceTest.bind(null, bufferEnd, maxFragLookUpTolerance));\n if (foundFragment && (foundFragment !== fragPrevious || !fragNext)) {\n return foundFragment;\n }\n // If no match was found return the next fragment after fragPrevious, or null\n return fragNext;\n}\nfunction fragmentWithinFastStartSwitch(fragNext, fragPrevious, nextFragLookupTolerance) {\n if (fragPrevious && fragPrevious.start === 0 && fragPrevious.level < fragNext.level && (fragPrevious.endPTS || 0) > 0) {\n const firstDuration = fragPrevious.tagList.reduce((duration, tag) => {\n if (tag[0] === 'INF') {\n duration += parseFloat(tag[1]);\n }\n return duration;\n }, nextFragLookupTolerance);\n return fragNext.start <= firstDuration;\n }\n return false;\n}\n\n/**\n * The test function used by the findFragmentBySn's BinarySearch to look for the best match to the current buffer conditions.\n * @param candidate - The fragment to test\n * @param bufferEnd - The end of the current buffered range the playhead is currently within\n * @param maxFragLookUpTolerance - The amount of time that a fragment's start can be within in order to be considered contiguous\n * @returns 0 if it matches, 1 if too low, -1 if too high\n */\nfunction fragmentWithinToleranceTest(bufferEnd = 0, maxFragLookUpTolerance = 0, candidate) {\n // eagerly accept an accurate match (no tolerance)\n if (candidate.start <= bufferEnd && candidate.start + candidate.duration > bufferEnd) {\n return 0;\n }\n // offset should be within fragment boundary - config.maxFragLookUpTolerance\n // this is to cope with situations like\n // bufferEnd = 9.991\n // frag[Ø] : [0,10]\n // frag[1] : [10,20]\n // bufferEnd is within frag[0] range ... although what we are expecting is to return frag[1] here\n // frag start frag start+duration\n // |-----------------------------|\n // <---> <--->\n // ...--------><-----------------------------><---------....\n // previous frag matching fragment next frag\n // return -1 return 0 return 1\n // logger.log(`level/sn/start/end/bufEnd:${level}/${candidate.sn}/${candidate.start}/${(candidate.start+candidate.duration)}/${bufferEnd}`);\n // Set the lookup tolerance to be small enough to detect the current segment - ensures we don't skip over very small segments\n const candidateLookupTolerance = Math.min(maxFragLookUpTolerance, candidate.duration + (candidate.deltaPTS ? candidate.deltaPTS : 0));\n if (candidate.start + candidate.duration - candidateLookupTolerance <= bufferEnd) {\n return 1;\n } else if (candidate.start - candidateLookupTolerance > bufferEnd && candidate.start) {\n // if maxFragLookUpTolerance will have negative value then don't return -1 for first element\n return -1;\n }\n return 0;\n}\n\n/**\n * The test function used by the findFragmentByPdt's BinarySearch to look for the best match to the current buffer conditions.\n * This function tests the candidate's program date time values, as represented in Unix time\n * @param candidate - The fragment to test\n * @param pdtBufferEnd - The Unix time representing the end of the current buffered range\n * @param maxFragLookUpTolerance - The amount of time that a fragment's start can be within in order to be considered contiguous\n * @returns true if contiguous, false otherwise\n */\nfunction pdtWithinToleranceTest(pdtBufferEnd, maxFragLookUpTolerance, candidate) {\n const candidateLookupTolerance = Math.min(maxFragLookUpTolerance, candidate.duration + (candidate.deltaPTS ? candidate.deltaPTS : 0)) * 1000;\n\n // endProgramDateTime can be null, default to zero\n const endProgramDateTime = candidate.endProgramDateTime || 0;\n return endProgramDateTime - candidateLookupTolerance > pdtBufferEnd;\n}\nfunction findFragWithCC(fragments, cc) {\n return BinarySearch.search(fragments, candidate => {\n if (candidate.cc < cc) {\n return 1;\n } else if (candidate.cc > cc) {\n return -1;\n } else {\n return 0;\n }\n });\n}\n\nvar NetworkErrorAction = {\n DoNothing: 0,\n SendEndCallback: 1,\n SendAlternateToPenaltyBox: 2,\n RemoveAlternatePermanently: 3,\n InsertDiscontinuity: 4,\n RetryRequest: 5\n};\nvar ErrorActionFlags = {\n None: 0,\n MoveAllAlternatesMatchingHost: 1,\n MoveAllAlternatesMatchingHDCP: 2,\n SwitchToSDR: 4\n}; // Reserved for future use\nclass ErrorController {\n constructor(hls) {\n this.hls = void 0;\n this.playlistError = 0;\n this.penalizedRenditions = {};\n this.log = void 0;\n this.warn = void 0;\n this.error = void 0;\n this.hls = hls;\n this.log = logger.log.bind(logger, `[info]:`);\n this.warn = logger.warn.bind(logger, `[warning]:`);\n this.error = logger.error.bind(logger, `[error]:`);\n this.registerListeners();\n }\n registerListeners() {\n const hls = this.hls;\n hls.on(Events.ERROR, this.onError, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n }\n unregisterListeners() {\n const hls = this.hls;\n if (!hls) {\n return;\n }\n hls.off(Events.ERROR, this.onError, this);\n hls.off(Events.ERROR, this.onErrorOut, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n }\n destroy() {\n this.unregisterListeners();\n // @ts-ignore\n this.hls = null;\n this.penalizedRenditions = {};\n }\n startLoad(startPosition) {}\n stopLoad() {\n this.playlistError = 0;\n }\n getVariantLevelIndex(frag) {\n return (frag == null ? void 0 : frag.type) === PlaylistLevelType.MAIN ? frag.level : this.hls.loadLevel;\n }\n onManifestLoading() {\n this.playlistError = 0;\n this.penalizedRenditions = {};\n }\n onLevelUpdated() {\n this.playlistError = 0;\n }\n onError(event, data) {\n var _data$frag, _data$level;\n if (data.fatal) {\n return;\n }\n const hls = this.hls;\n const context = data.context;\n switch (data.details) {\n case ErrorDetails.FRAG_LOAD_ERROR:\n case ErrorDetails.FRAG_LOAD_TIMEOUT:\n case ErrorDetails.KEY_LOAD_ERROR:\n case ErrorDetails.KEY_LOAD_TIMEOUT:\n data.errorAction = this.getFragRetryOrSwitchAction(data);\n return;\n case ErrorDetails.FRAG_PARSING_ERROR:\n // ignore empty segment errors marked as gap\n if ((_data$frag = data.frag) != null && _data$frag.gap) {\n data.errorAction = {\n action: NetworkErrorAction.DoNothing,\n flags: ErrorActionFlags.None\n };\n return;\n }\n // falls through\n case ErrorDetails.FRAG_GAP:\n case ErrorDetails.FRAG_DECRYPT_ERROR:\n {\n // Switch level if possible, otherwise allow retry count to reach max error retries\n data.errorAction = this.getFragRetryOrSwitchAction(data);\n data.errorAction.action = NetworkErrorAction.SendAlternateToPenaltyBox;\n return;\n }\n case ErrorDetails.LEVEL_EMPTY_ERROR:\n case ErrorDetails.LEVEL_PARSING_ERROR:\n {\n var _data$context, _data$context$levelDe;\n // Only retry when empty and live\n const levelIndex = data.parent === PlaylistLevelType.MAIN ? data.level : hls.loadLevel;\n if (data.details === ErrorDetails.LEVEL_EMPTY_ERROR && !!((_data$context = data.context) != null && (_data$context$levelDe = _data$context.levelDetails) != null && _data$context$levelDe.live)) {\n data.errorAction = this.getPlaylistRetryOrSwitchAction(data, levelIndex);\n } else {\n // Escalate to fatal if not retrying or switching\n data.levelRetry = false;\n data.errorAction = this.getLevelSwitchAction(data, levelIndex);\n }\n }\n return;\n case ErrorDetails.LEVEL_LOAD_ERROR:\n case ErrorDetails.LEVEL_LOAD_TIMEOUT:\n if (typeof (context == null ? void 0 : context.level) === 'number') {\n data.errorAction = this.getPlaylistRetryOrSwitchAction(data, context.level);\n }\n return;\n case ErrorDetails.AUDIO_TRACK_LOAD_ERROR:\n case ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT:\n case ErrorDetails.SUBTITLE_LOAD_ERROR:\n case ErrorDetails.SUBTITLE_TRACK_LOAD_TIMEOUT:\n if (context) {\n const level = hls.levels[hls.loadLevel];\n if (level && (context.type === PlaylistContextType.AUDIO_TRACK && level.hasAudioGroup(context.groupId) || context.type === PlaylistContextType.SUBTITLE_TRACK && level.hasSubtitleGroup(context.groupId))) {\n // Perform Pathway switch or Redundant failover if possible for fastest recovery\n // otherwise allow playlist retry count to reach max error retries\n data.errorAction = this.getPlaylistRetryOrSwitchAction(data, hls.loadLevel);\n data.errorAction.action = NetworkErrorAction.SendAlternateToPenaltyBox;\n data.errorAction.flags = ErrorActionFlags.MoveAllAlternatesMatchingHost;\n return;\n }\n }\n return;\n case ErrorDetails.KEY_SYSTEM_STATUS_OUTPUT_RESTRICTED:\n {\n const level = hls.levels[hls.loadLevel];\n const restrictedHdcpLevel = level == null ? void 0 : level.attrs['HDCP-LEVEL'];\n if (restrictedHdcpLevel) {\n data.errorAction = {\n action: NetworkErrorAction.SendAlternateToPenaltyBox,\n flags: ErrorActionFlags.MoveAllAlternatesMatchingHDCP,\n hdcpLevel: restrictedHdcpLevel\n };\n } else {\n this.keySystemError(data);\n }\n }\n return;\n case ErrorDetails.BUFFER_ADD_CODEC_ERROR:\n case ErrorDetails.REMUX_ALLOC_ERROR:\n case ErrorDetails.BUFFER_APPEND_ERROR:\n data.errorAction = this.getLevelSwitchAction(data, (_data$level = data.level) != null ? _data$level : hls.loadLevel);\n return;\n case ErrorDetails.INTERNAL_EXCEPTION:\n case ErrorDetails.BUFFER_APPENDING_ERROR:\n case ErrorDetails.BUFFER_FULL_ERROR:\n case ErrorDetails.LEVEL_SWITCH_ERROR:\n case ErrorDetails.BUFFER_STALLED_ERROR:\n case ErrorDetails.BUFFER_SEEK_OVER_HOLE:\n case ErrorDetails.BUFFER_NUDGE_ON_STALL:\n data.errorAction = {\n action: NetworkErrorAction.DoNothing,\n flags: ErrorActionFlags.None\n };\n return;\n }\n if (data.type === ErrorTypes.KEY_SYSTEM_ERROR) {\n this.keySystemError(data);\n }\n }\n keySystemError(data) {\n const levelIndex = this.getVariantLevelIndex(data.frag);\n // Do not retry level. Escalate to fatal if switching levels fails.\n data.levelRetry = false;\n data.errorAction = this.getLevelSwitchAction(data, levelIndex);\n }\n getPlaylistRetryOrSwitchAction(data, levelIndex) {\n const hls = this.hls;\n const retryConfig = getRetryConfig(hls.config.playlistLoadPolicy, data);\n const retryCount = this.playlistError++;\n const retry = shouldRetry(retryConfig, retryCount, isTimeoutError(data), data.response);\n if (retry) {\n return {\n action: NetworkErrorAction.RetryRequest,\n flags: ErrorActionFlags.None,\n retryConfig,\n retryCount\n };\n }\n const errorAction = this.getLevelSwitchAction(data, levelIndex);\n if (retryConfig) {\n errorAction.retryConfig = retryConfig;\n errorAction.retryCount = retryCount;\n }\n return errorAction;\n }\n getFragRetryOrSwitchAction(data) {\n const hls = this.hls;\n // Share fragment error count accross media options (main, audio, subs)\n // This allows for level based rendition switching when media option assets fail\n const variantLevelIndex = this.getVariantLevelIndex(data.frag);\n const level = hls.levels[variantLevelIndex];\n const {\n fragLoadPolicy,\n keyLoadPolicy\n } = hls.config;\n const retryConfig = getRetryConfig(data.details.startsWith('key') ? keyLoadPolicy : fragLoadPolicy, data);\n const fragmentErrors = hls.levels.reduce((acc, level) => acc + level.fragmentError, 0);\n // Switch levels when out of retried or level index out of bounds\n if (level) {\n if (data.details !== ErrorDetails.FRAG_GAP) {\n level.fragmentError++;\n }\n const retry = shouldRetry(retryConfig, fragmentErrors, isTimeoutError(data), data.response);\n if (retry) {\n return {\n action: NetworkErrorAction.RetryRequest,\n flags: ErrorActionFlags.None,\n retryConfig,\n retryCount: fragmentErrors\n };\n }\n }\n // Reach max retry count, or Missing level reference\n // Switch to valid index\n const errorAction = this.getLevelSwitchAction(data, variantLevelIndex);\n // Add retry details to allow skipping of FRAG_PARSING_ERROR\n if (retryConfig) {\n errorAction.retryConfig = retryConfig;\n errorAction.retryCount = fragmentErrors;\n }\n return errorAction;\n }\n getLevelSwitchAction(data, levelIndex) {\n const hls = this.hls;\n if (levelIndex === null || levelIndex === undefined) {\n levelIndex = hls.loadLevel;\n }\n const level = this.hls.levels[levelIndex];\n if (level) {\n var _data$frag2, _data$context2;\n const errorDetails = data.details;\n level.loadError++;\n if (errorDetails === ErrorDetails.BUFFER_APPEND_ERROR) {\n level.fragmentError++;\n }\n // Search for next level to retry\n let nextLevel = -1;\n const {\n levels,\n loadLevel,\n minAutoLevel,\n maxAutoLevel\n } = hls;\n if (!hls.autoLevelEnabled) {\n hls.loadLevel = -1;\n }\n const fragErrorType = (_data$frag2 = data.frag) == null ? void 0 : _data$frag2.type;\n // Find alternate audio codec if available on audio codec error\n const isAudioCodecError = fragErrorType === PlaylistLevelType.AUDIO && errorDetails === ErrorDetails.FRAG_PARSING_ERROR || data.sourceBufferName === 'audio' && (errorDetails === ErrorDetails.BUFFER_ADD_CODEC_ERROR || errorDetails === ErrorDetails.BUFFER_APPEND_ERROR);\n const findAudioCodecAlternate = isAudioCodecError && levels.some(({\n audioCodec\n }) => level.audioCodec !== audioCodec);\n // Find alternate video codec if available on video codec error\n const isVideoCodecError = data.sourceBufferName === 'video' && (errorDetails === ErrorDetails.BUFFER_ADD_CODEC_ERROR || errorDetails === ErrorDetails.BUFFER_APPEND_ERROR);\n const findVideoCodecAlternate = isVideoCodecError && levels.some(({\n codecSet,\n audioCodec\n }) => level.codecSet !== codecSet && level.audioCodec === audioCodec);\n const {\n type: playlistErrorType,\n groupId: playlistErrorGroupId\n } = (_data$context2 = data.context) != null ? _data$context2 : {};\n for (let i = levels.length; i--;) {\n const candidate = (i + loadLevel) % levels.length;\n if (candidate !== loadLevel && candidate >= minAutoLevel && candidate <= maxAutoLevel && levels[candidate].loadError === 0) {\n var _level$audioGroups, _level$subtitleGroups;\n const levelCandidate = levels[candidate];\n // Skip level switch if GAP tag is found in next level at same position\n if (errorDetails === ErrorDetails.FRAG_GAP && fragErrorType === PlaylistLevelType.MAIN && data.frag) {\n const levelDetails = levels[candidate].details;\n if (levelDetails) {\n const fragCandidate = findFragmentByPTS(data.frag, levelDetails.fragments, data.frag.start);\n if (fragCandidate != null && fragCandidate.gap) {\n continue;\n }\n }\n } else if (playlistErrorType === PlaylistContextType.AUDIO_TRACK && levelCandidate.hasAudioGroup(playlistErrorGroupId) || playlistErrorType === PlaylistContextType.SUBTITLE_TRACK && levelCandidate.hasSubtitleGroup(playlistErrorGroupId)) {\n // For audio/subs playlist errors find another group ID or fallthrough to redundant fail-over\n continue;\n } else if (fragErrorType === PlaylistLevelType.AUDIO && (_level$audioGroups = level.audioGroups) != null && _level$audioGroups.some(groupId => levelCandidate.hasAudioGroup(groupId)) || fragErrorType === PlaylistLevelType.SUBTITLE && (_level$subtitleGroups = level.subtitleGroups) != null && _level$subtitleGroups.some(groupId => levelCandidate.hasSubtitleGroup(groupId)) || findAudioCodecAlternate && level.audioCodec === levelCandidate.audioCodec || !findAudioCodecAlternate && level.audioCodec !== levelCandidate.audioCodec || findVideoCodecAlternate && level.codecSet === levelCandidate.codecSet) {\n // For video/audio/subs frag errors find another group ID or fallthrough to redundant fail-over\n continue;\n }\n nextLevel = candidate;\n break;\n }\n }\n if (nextLevel > -1 && hls.loadLevel !== nextLevel) {\n data.levelRetry = true;\n this.playlistError = 0;\n return {\n action: NetworkErrorAction.SendAlternateToPenaltyBox,\n flags: ErrorActionFlags.None,\n nextAutoLevel: nextLevel\n };\n }\n }\n // No levels to switch / Manual level selection / Level not found\n // Resolve with Pathway switch, Redundant fail-over, or stay on lowest Level\n return {\n action: NetworkErrorAction.SendAlternateToPenaltyBox,\n flags: ErrorActionFlags.MoveAllAlternatesMatchingHost\n };\n }\n onErrorOut(event, data) {\n var _data$errorAction;\n switch ((_data$errorAction = data.errorAction) == null ? void 0 : _data$errorAction.action) {\n case NetworkErrorAction.DoNothing:\n break;\n case NetworkErrorAction.SendAlternateToPenaltyBox:\n this.sendAlternateToPenaltyBox(data);\n if (!data.errorAction.resolved && data.details !== ErrorDetails.FRAG_GAP) {\n data.fatal = true;\n } else if (/MediaSource readyState: ended/.test(data.error.message)) {\n this.warn(`MediaSource ended after \"${data.sourceBufferName}\" sourceBuffer append error. Attempting to recover from media error.`);\n this.hls.recoverMediaError();\n }\n break;\n case NetworkErrorAction.RetryRequest:\n // handled by stream and playlist/level controllers\n break;\n }\n if (data.fatal) {\n this.hls.stopLoad();\n return;\n }\n }\n sendAlternateToPenaltyBox(data) {\n const hls = this.hls;\n const errorAction = data.errorAction;\n if (!errorAction) {\n return;\n }\n const {\n flags,\n hdcpLevel,\n nextAutoLevel\n } = errorAction;\n switch (flags) {\n case ErrorActionFlags.None:\n this.switchLevel(data, nextAutoLevel);\n break;\n case ErrorActionFlags.MoveAllAlternatesMatchingHDCP:\n if (hdcpLevel) {\n hls.maxHdcpLevel = HdcpLevels[HdcpLevels.indexOf(hdcpLevel) - 1];\n errorAction.resolved = true;\n }\n this.warn(`Restricting playback to HDCP-LEVEL of \"${hls.maxHdcpLevel}\" or lower`);\n break;\n }\n // If not resolved by previous actions try to switch to next level\n if (!errorAction.resolved) {\n this.switchLevel(data, nextAutoLevel);\n }\n }\n switchLevel(data, levelIndex) {\n if (levelIndex !== undefined && data.errorAction) {\n this.warn(`switching to level ${levelIndex} after ${data.details}`);\n this.hls.nextAutoLevel = levelIndex;\n data.errorAction.resolved = true;\n // Stream controller is responsible for this but won't switch on false start\n this.hls.nextLoadLevel = this.hls.nextAutoLevel;\n }\n }\n}\n\nclass BasePlaylistController {\n constructor(hls, logPrefix) {\n this.hls = void 0;\n this.timer = -1;\n this.requestScheduled = -1;\n this.canLoad = false;\n this.log = void 0;\n this.warn = void 0;\n this.log = logger.log.bind(logger, `${logPrefix}:`);\n this.warn = logger.warn.bind(logger, `${logPrefix}:`);\n this.hls = hls;\n }\n destroy() {\n this.clearTimer();\n // @ts-ignore\n this.hls = this.log = this.warn = null;\n }\n clearTimer() {\n if (this.timer !== -1) {\n self.clearTimeout(this.timer);\n this.timer = -1;\n }\n }\n startLoad() {\n this.canLoad = true;\n this.requestScheduled = -1;\n this.loadPlaylist();\n }\n stopLoad() {\n this.canLoad = false;\n this.clearTimer();\n }\n switchParams(playlistUri, previous, current) {\n const renditionReports = previous == null ? void 0 : previous.renditionReports;\n if (renditionReports) {\n let foundIndex = -1;\n for (let i = 0; i < renditionReports.length; i++) {\n const attr = renditionReports[i];\n let uri;\n try {\n uri = new self.URL(attr.URI, previous.url).href;\n } catch (error) {\n logger.warn(`Could not construct new URL for Rendition Report: ${error}`);\n uri = attr.URI || '';\n }\n // Use exact match. Otherwise, the last partial match, if any, will be used\n // (Playlist URI includes a query string that the Rendition Report does not)\n if (uri === playlistUri) {\n foundIndex = i;\n break;\n } else if (uri === playlistUri.substring(0, uri.length)) {\n foundIndex = i;\n }\n }\n if (foundIndex !== -1) {\n const attr = renditionReports[foundIndex];\n const msn = parseInt(attr['LAST-MSN']) || (previous == null ? void 0 : previous.lastPartSn);\n let part = parseInt(attr['LAST-PART']) || (previous == null ? void 0 : previous.lastPartIndex);\n if (this.hls.config.lowLatencyMode) {\n const currentGoal = Math.min(previous.age - previous.partTarget, previous.targetduration);\n if (part >= 0 && currentGoal > previous.partTarget) {\n part += 1;\n }\n }\n const skip = current && getSkipValue(current);\n return new HlsUrlParameters(msn, part >= 0 ? part : undefined, skip);\n }\n }\n }\n loadPlaylist(hlsUrlParameters) {\n if (this.requestScheduled === -1) {\n this.requestScheduled = self.performance.now();\n }\n // Loading is handled by the subclasses\n }\n shouldLoadPlaylist(playlist) {\n return this.canLoad && !!playlist && !!playlist.url && (!playlist.details || playlist.details.live);\n }\n shouldReloadPlaylist(playlist) {\n return this.timer === -1 && this.requestScheduled === -1 && this.shouldLoadPlaylist(playlist);\n }\n playlistLoaded(index, data, previousDetails) {\n const {\n details,\n stats\n } = data;\n\n // Set last updated date-time\n const now = self.performance.now();\n const elapsed = stats.loading.first ? Math.max(0, now - stats.loading.first) : 0;\n details.advancedDateTime = Date.now() - elapsed;\n\n // if current playlist is a live playlist, arm a timer to reload it\n if (details.live || previousDetails != null && previousDetails.live) {\n details.reloaded(previousDetails);\n if (previousDetails) {\n this.log(`live playlist ${index} ${details.advanced ? 'REFRESHED ' + details.lastPartSn + '-' + details.lastPartIndex : details.updated ? 'UPDATED' : 'MISSED'}`);\n }\n // Merge live playlists to adjust fragment starts and fill in delta playlist skipped segments\n if (previousDetails && details.fragments.length > 0) {\n mergeDetails(previousDetails, details);\n }\n if (!this.canLoad || !details.live) {\n return;\n }\n let deliveryDirectives;\n let msn = undefined;\n let part = undefined;\n if (details.canBlockReload && details.endSN && details.advanced) {\n // Load level with LL-HLS delivery directives\n const lowLatencyMode = this.hls.config.lowLatencyMode;\n const lastPartSn = details.lastPartSn;\n const endSn = details.endSN;\n const lastPartIndex = details.lastPartIndex;\n const hasParts = lastPartIndex !== -1;\n const lastPart = lastPartSn === endSn;\n // When low latency mode is disabled, we'll skip part requests once the last part index is found\n const nextSnStartIndex = lowLatencyMode ? 0 : lastPartIndex;\n if (hasParts) {\n msn = lastPart ? endSn + 1 : lastPartSn;\n part = lastPart ? nextSnStartIndex : lastPartIndex + 1;\n } else {\n msn = endSn + 1;\n }\n // Low-Latency CDN Tune-in: \"age\" header and time since load indicates we're behind by more than one part\n // Update directives to obtain the Playlist that has the estimated additional duration of media\n const lastAdvanced = details.age;\n const cdnAge = lastAdvanced + details.ageHeader;\n let currentGoal = Math.min(cdnAge - details.partTarget, details.targetduration * 1.5);\n if (currentGoal > 0) {\n if (previousDetails && currentGoal > previousDetails.tuneInGoal) {\n // If we attempted to get the next or latest playlist update, but currentGoal increased,\n // then we either can't catchup, or the \"age\" header cannot be trusted.\n this.warn(`CDN Tune-in goal increased from: ${previousDetails.tuneInGoal} to: ${currentGoal} with playlist age: ${details.age}`);\n currentGoal = 0;\n } else {\n const segments = Math.floor(currentGoal / details.targetduration);\n msn += segments;\n if (part !== undefined) {\n const parts = Math.round(currentGoal % details.targetduration / details.partTarget);\n part += parts;\n }\n this.log(`CDN Tune-in age: ${details.ageHeader}s last advanced ${lastAdvanced.toFixed(2)}s goal: ${currentGoal} skip sn ${segments} to part ${part}`);\n }\n details.tuneInGoal = currentGoal;\n }\n deliveryDirectives = this.getDeliveryDirectives(details, data.deliveryDirectives, msn, part);\n if (lowLatencyMode || !lastPart) {\n this.loadPlaylist(deliveryDirectives);\n return;\n }\n } else if (details.canBlockReload || details.canSkipUntil) {\n deliveryDirectives = this.getDeliveryDirectives(details, data.deliveryDirectives, msn, part);\n }\n const bufferInfo = this.hls.mainForwardBufferInfo;\n const position = bufferInfo ? bufferInfo.end - bufferInfo.len : 0;\n const distanceToLiveEdgeMs = (details.edge - position) * 1000;\n const reloadInterval = computeReloadInterval(details, distanceToLiveEdgeMs);\n if (details.updated && now > this.requestScheduled + reloadInterval) {\n this.requestScheduled = stats.loading.start;\n }\n if (msn !== undefined && details.canBlockReload) {\n this.requestScheduled = stats.loading.first + reloadInterval - (details.partTarget * 1000 || 1000);\n } else if (this.requestScheduled === -1 || this.requestScheduled + reloadInterval < now) {\n this.requestScheduled = now;\n } else if (this.requestScheduled - now <= 0) {\n this.requestScheduled += reloadInterval;\n }\n let estimatedTimeUntilUpdate = this.requestScheduled - now;\n estimatedTimeUntilUpdate = Math.max(0, estimatedTimeUntilUpdate);\n this.log(`reload live playlist ${index} in ${Math.round(estimatedTimeUntilUpdate)} ms`);\n // this.log(\n // `live reload ${details.updated ? 'REFRESHED' : 'MISSED'}\n // reload in ${estimatedTimeUntilUpdate / 1000}\n // round trip ${(stats.loading.end - stats.loading.start) / 1000}\n // diff ${\n // (reloadInterval -\n // (estimatedTimeUntilUpdate +\n // stats.loading.end -\n // stats.loading.start)) /\n // 1000\n // }\n // reload interval ${reloadInterval / 1000}\n // target duration ${details.targetduration}\n // distance to edge ${distanceToLiveEdgeMs / 1000}`\n // );\n\n this.timer = self.setTimeout(() => this.loadPlaylist(deliveryDirectives), estimatedTimeUntilUpdate);\n } else {\n this.clearTimer();\n }\n }\n getDeliveryDirectives(details, previousDeliveryDirectives, msn, part) {\n let skip = getSkipValue(details);\n if (previousDeliveryDirectives != null && previousDeliveryDirectives.skip && details.deltaUpdateFailed) {\n msn = previousDeliveryDirectives.msn;\n part = previousDeliveryDirectives.part;\n skip = HlsSkip.No;\n }\n return new HlsUrlParameters(msn, part, skip);\n }\n checkRetry(errorEvent) {\n const errorDetails = errorEvent.details;\n const isTimeout = isTimeoutError(errorEvent);\n const errorAction = errorEvent.errorAction;\n const {\n action,\n retryCount = 0,\n retryConfig\n } = errorAction || {};\n const retry = !!errorAction && !!retryConfig && (action === NetworkErrorAction.RetryRequest || !errorAction.resolved && action === NetworkErrorAction.SendAlternateToPenaltyBox);\n if (retry) {\n var _errorEvent$context;\n this.requestScheduled = -1;\n if (retryCount >= retryConfig.maxNumRetry) {\n return false;\n }\n if (isTimeout && (_errorEvent$context = errorEvent.context) != null && _errorEvent$context.deliveryDirectives) {\n // The LL-HLS request already timed out so retry immediately\n this.warn(`Retrying playlist loading ${retryCount + 1}/${retryConfig.maxNumRetry} after \"${errorDetails}\" without delivery-directives`);\n this.loadPlaylist();\n } else {\n const delay = getRetryDelay(retryConfig, retryCount);\n // Schedule level/track reload\n this.timer = self.setTimeout(() => this.loadPlaylist(), delay);\n this.warn(`Retrying playlist loading ${retryCount + 1}/${retryConfig.maxNumRetry} after \"${errorDetails}\" in ${delay}ms`);\n }\n // `levelRetry = true` used to inform other controllers that a retry is happening\n errorEvent.levelRetry = true;\n errorAction.resolved = true;\n }\n return retry;\n }\n}\n\n/*\n * compute an Exponential Weighted moving average\n * - https://en.wikipedia.org/wiki/Moving_average#Exponential_moving_average\n * - heavily inspired from shaka-player\n */\n\nclass EWMA {\n // About half of the estimated value will be from the last |halfLife| samples by weight.\n constructor(halfLife, estimate = 0, weight = 0) {\n this.halfLife = void 0;\n this.alpha_ = void 0;\n this.estimate_ = void 0;\n this.totalWeight_ = void 0;\n this.halfLife = halfLife;\n // Larger values of alpha expire historical data more slowly.\n this.alpha_ = halfLife ? Math.exp(Math.log(0.5) / halfLife) : 0;\n this.estimate_ = estimate;\n this.totalWeight_ = weight;\n }\n sample(weight, value) {\n const adjAlpha = Math.pow(this.alpha_, weight);\n this.estimate_ = value * (1 - adjAlpha) + adjAlpha * this.estimate_;\n this.totalWeight_ += weight;\n }\n getTotalWeight() {\n return this.totalWeight_;\n }\n getEstimate() {\n if (this.alpha_) {\n const zeroFactor = 1 - Math.pow(this.alpha_, this.totalWeight_);\n if (zeroFactor) {\n return this.estimate_ / zeroFactor;\n }\n }\n return this.estimate_;\n }\n}\n\n/*\n * EWMA Bandwidth Estimator\n * - heavily inspired from shaka-player\n * Tracks bandwidth samples and estimates available bandwidth.\n * Based on the minimum of two exponentially-weighted moving averages with\n * different half-lives.\n */\n\nclass EwmaBandWidthEstimator {\n constructor(slow, fast, defaultEstimate, defaultTTFB = 100) {\n this.defaultEstimate_ = void 0;\n this.minWeight_ = void 0;\n this.minDelayMs_ = void 0;\n this.slow_ = void 0;\n this.fast_ = void 0;\n this.defaultTTFB_ = void 0;\n this.ttfb_ = void 0;\n this.defaultEstimate_ = defaultEstimate;\n this.minWeight_ = 0.001;\n this.minDelayMs_ = 50;\n this.slow_ = new EWMA(slow);\n this.fast_ = new EWMA(fast);\n this.defaultTTFB_ = defaultTTFB;\n this.ttfb_ = new EWMA(slow);\n }\n update(slow, fast) {\n const {\n slow_,\n fast_,\n ttfb_\n } = this;\n if (slow_.halfLife !== slow) {\n this.slow_ = new EWMA(slow, slow_.getEstimate(), slow_.getTotalWeight());\n }\n if (fast_.halfLife !== fast) {\n this.fast_ = new EWMA(fast, fast_.getEstimate(), fast_.getTotalWeight());\n }\n if (ttfb_.halfLife !== slow) {\n this.ttfb_ = new EWMA(slow, ttfb_.getEstimate(), ttfb_.getTotalWeight());\n }\n }\n sample(durationMs, numBytes) {\n durationMs = Math.max(durationMs, this.minDelayMs_);\n const numBits = 8 * numBytes;\n // weight is duration in seconds\n const durationS = durationMs / 1000;\n // value is bandwidth in bits/s\n const bandwidthInBps = numBits / durationS;\n this.fast_.sample(durationS, bandwidthInBps);\n this.slow_.sample(durationS, bandwidthInBps);\n }\n sampleTTFB(ttfb) {\n // weight is frequency curve applied to TTFB in seconds\n // (longer times have less weight with expected input under 1 second)\n const seconds = ttfb / 1000;\n const weight = Math.sqrt(2) * Math.exp(-Math.pow(seconds, 2) / 2);\n this.ttfb_.sample(weight, Math.max(ttfb, 5));\n }\n canEstimate() {\n return this.fast_.getTotalWeight() >= this.minWeight_;\n }\n getEstimate() {\n if (this.canEstimate()) {\n // console.log('slow estimate:'+ Math.round(this.slow_.getEstimate()));\n // console.log('fast estimate:'+ Math.round(this.fast_.getEstimate()));\n // Take the minimum of these two estimates. This should have the effect of\n // adapting down quickly, but up more slowly.\n return Math.min(this.fast_.getEstimate(), this.slow_.getEstimate());\n } else {\n return this.defaultEstimate_;\n }\n }\n getEstimateTTFB() {\n if (this.ttfb_.getTotalWeight() >= this.minWeight_) {\n return this.ttfb_.getEstimate();\n } else {\n return this.defaultTTFB_;\n }\n }\n destroy() {}\n}\n\nconst SUPPORTED_INFO_DEFAULT = {\n supported: true,\n configurations: [],\n decodingInfoResults: [{\n supported: true,\n powerEfficient: true,\n smooth: true\n }]\n};\nconst SUPPORTED_INFO_CACHE = {};\nfunction requiresMediaCapabilitiesDecodingInfo(level, audioTracksByGroup, currentVideoRange, currentFrameRate, currentBw, audioPreference) {\n // Only test support when configuration is exceeds minimum options\n const audioGroups = level.audioCodec ? level.audioGroups : null;\n const audioCodecPreference = audioPreference == null ? void 0 : audioPreference.audioCodec;\n const channelsPreference = audioPreference == null ? void 0 : audioPreference.channels;\n const maxChannels = channelsPreference ? parseInt(channelsPreference) : audioCodecPreference ? Infinity : 2;\n let audioChannels = null;\n if (audioGroups != null && audioGroups.length) {\n try {\n if (audioGroups.length === 1 && audioGroups[0]) {\n audioChannels = audioTracksByGroup.groups[audioGroups[0]].channels;\n } else {\n audioChannels = audioGroups.reduce((acc, groupId) => {\n if (groupId) {\n const audioTrackGroup = audioTracksByGroup.groups[groupId];\n if (!audioTrackGroup) {\n throw new Error(`Audio track group ${groupId} not found`);\n }\n // Sum all channel key values\n Object.keys(audioTrackGroup.channels).forEach(key => {\n acc[key] = (acc[key] || 0) + audioTrackGroup.channels[key];\n });\n }\n return acc;\n }, {\n 2: 0\n });\n }\n } catch (error) {\n return true;\n }\n }\n return level.videoCodec !== undefined && (level.width > 1920 && level.height > 1088 || level.height > 1920 && level.width > 1088 || level.frameRate > Math.max(currentFrameRate, 30) || level.videoRange !== 'SDR' && level.videoRange !== currentVideoRange || level.bitrate > Math.max(currentBw, 8e6)) || !!audioChannels && isFiniteNumber(maxChannels) && Object.keys(audioChannels).some(channels => parseInt(channels) > maxChannels);\n}\nfunction getMediaDecodingInfoPromise(level, audioTracksByGroup, mediaCapabilities) {\n const videoCodecs = level.videoCodec;\n const audioCodecs = level.audioCodec;\n if (!videoCodecs || !audioCodecs || !mediaCapabilities) {\n return Promise.resolve(SUPPORTED_INFO_DEFAULT);\n }\n const baseVideoConfiguration = {\n width: level.width,\n height: level.height,\n bitrate: Math.ceil(Math.max(level.bitrate * 0.9, level.averageBitrate)),\n // Assume a framerate of 30fps since MediaCapabilities will not accept Level default of 0.\n framerate: level.frameRate || 30\n };\n const videoRange = level.videoRange;\n if (videoRange !== 'SDR') {\n baseVideoConfiguration.transferFunction = videoRange.toLowerCase();\n }\n const configurations = videoCodecs.split(',').map(videoCodec => ({\n type: 'media-source',\n video: _objectSpread2(_objectSpread2({}, baseVideoConfiguration), {}, {\n contentType: mimeTypeForCodec(videoCodec, 'video')\n })\n }));\n if (audioCodecs && level.audioGroups) {\n level.audioGroups.forEach(audioGroupId => {\n var _audioTracksByGroup$g;\n if (!audioGroupId) {\n return;\n }\n (_audioTracksByGroup$g = audioTracksByGroup.groups[audioGroupId]) == null ? void 0 : _audioTracksByGroup$g.tracks.forEach(audioTrack => {\n if (audioTrack.groupId === audioGroupId) {\n const channels = audioTrack.channels || '';\n const channelsNumber = parseFloat(channels);\n if (isFiniteNumber(channelsNumber) && channelsNumber > 2) {\n configurations.push.apply(configurations, audioCodecs.split(',').map(audioCodec => ({\n type: 'media-source',\n audio: {\n contentType: mimeTypeForCodec(audioCodec, 'audio'),\n channels: '' + channelsNumber\n // spatialRendering:\n // audioCodec === 'ec-3' && channels.indexOf('JOC'),\n }\n })));\n }\n }\n });\n });\n }\n return Promise.all(configurations.map(configuration => {\n // Cache MediaCapabilities promises\n const decodingInfoKey = getMediaDecodingInfoKey(configuration);\n return SUPPORTED_INFO_CACHE[decodingInfoKey] || (SUPPORTED_INFO_CACHE[decodingInfoKey] = mediaCapabilities.decodingInfo(configuration));\n })).then(decodingInfoResults => ({\n supported: !decodingInfoResults.some(info => !info.supported),\n configurations,\n decodingInfoResults\n })).catch(error => ({\n supported: false,\n configurations,\n decodingInfoResults: [],\n error\n }));\n}\nfunction getMediaDecodingInfoKey(config) {\n const {\n audio,\n video\n } = config;\n const mediaConfig = video || audio;\n if (mediaConfig) {\n const codec = mediaConfig.contentType.split('\"')[1];\n if (video) {\n return `r${video.height}x${video.width}f${Math.ceil(video.framerate)}${video.transferFunction || 'sd'}_${codec}_${Math.ceil(video.bitrate / 1e5)}`;\n }\n if (audio) {\n return `c${audio.channels}${audio.spatialRendering ? 's' : 'n'}_${codec}`;\n }\n }\n return '';\n}\n\n/**\n * @returns Whether we can detect and validate HDR capability within the window context\n */\nfunction isHdrSupported() {\n if (typeof matchMedia === 'function') {\n const mediaQueryList = matchMedia('(dynamic-range: high)');\n const badQuery = matchMedia('bad query');\n if (mediaQueryList.media !== badQuery.media) {\n return mediaQueryList.matches === true;\n }\n }\n return false;\n}\n\n/**\n * Sanitizes inputs to return the active video selection options for HDR/SDR.\n * When both inputs are null:\n *\n * `{ preferHDR: false, allowedVideoRanges: [] }`\n *\n * When `currentVideoRange` non-null, maintain the active range:\n *\n * `{ preferHDR: currentVideoRange !== 'SDR', allowedVideoRanges: [currentVideoRange] }`\n *\n * When VideoSelectionOption non-null:\n *\n * - Allow all video ranges if `allowedVideoRanges` unspecified.\n * - If `preferHDR` is non-null use the value to filter `allowedVideoRanges`.\n * - Else check window for HDR support and set `preferHDR` to the result.\n *\n * @param currentVideoRange\n * @param videoPreference\n */\nfunction getVideoSelectionOptions(currentVideoRange, videoPreference) {\n let preferHDR = false;\n let allowedVideoRanges = [];\n if (currentVideoRange) {\n preferHDR = currentVideoRange !== 'SDR';\n allowedVideoRanges = [currentVideoRange];\n }\n if (videoPreference) {\n allowedVideoRanges = videoPreference.allowedVideoRanges || VideoRangeValues.slice(0);\n preferHDR = videoPreference.preferHDR !== undefined ? videoPreference.preferHDR : isHdrSupported();\n if (preferHDR) {\n allowedVideoRanges = allowedVideoRanges.filter(range => range !== 'SDR');\n } else {\n allowedVideoRanges = ['SDR'];\n }\n }\n return {\n preferHDR,\n allowedVideoRanges\n };\n}\n\nfunction getStartCodecTier(codecTiers, currentVideoRange, currentBw, audioPreference, videoPreference) {\n const codecSets = Object.keys(codecTiers);\n const channelsPreference = audioPreference == null ? void 0 : audioPreference.channels;\n const audioCodecPreference = audioPreference == null ? void 0 : audioPreference.audioCodec;\n const preferStereo = channelsPreference && parseInt(channelsPreference) === 2;\n // Use first level set to determine stereo, and minimum resolution and framerate\n let hasStereo = true;\n let hasCurrentVideoRange = false;\n let minHeight = Infinity;\n let minFramerate = Infinity;\n let minBitrate = Infinity;\n let selectedScore = 0;\n let videoRanges = [];\n const {\n preferHDR,\n allowedVideoRanges\n } = getVideoSelectionOptions(currentVideoRange, videoPreference);\n for (let i = codecSets.length; i--;) {\n const tier = codecTiers[codecSets[i]];\n hasStereo = tier.channels[2] > 0;\n minHeight = Math.min(minHeight, tier.minHeight);\n minFramerate = Math.min(minFramerate, tier.minFramerate);\n minBitrate = Math.min(minBitrate, tier.minBitrate);\n const matchingVideoRanges = allowedVideoRanges.filter(range => tier.videoRanges[range] > 0);\n if (matchingVideoRanges.length > 0) {\n hasCurrentVideoRange = true;\n videoRanges = matchingVideoRanges;\n }\n }\n minHeight = isFiniteNumber(minHeight) ? minHeight : 0;\n minFramerate = isFiniteNumber(minFramerate) ? minFramerate : 0;\n const maxHeight = Math.max(1080, minHeight);\n const maxFramerate = Math.max(30, minFramerate);\n minBitrate = isFiniteNumber(minBitrate) ? minBitrate : currentBw;\n currentBw = Math.max(minBitrate, currentBw);\n // If there are no variants with matching preference, set currentVideoRange to undefined\n if (!hasCurrentVideoRange) {\n currentVideoRange = undefined;\n videoRanges = [];\n }\n const codecSet = codecSets.reduce((selected, candidate) => {\n // Remove candiates which do not meet bitrate, default audio, stereo or channels preference, 1080p or lower, 30fps or lower, or SDR/HDR selection if present\n const candidateTier = codecTiers[candidate];\n if (candidate === selected) {\n return selected;\n }\n if (candidateTier.minBitrate > currentBw) {\n logStartCodecCandidateIgnored(candidate, `min bitrate of ${candidateTier.minBitrate} > current estimate of ${currentBw}`);\n return selected;\n }\n if (!candidateTier.hasDefaultAudio) {\n logStartCodecCandidateIgnored(candidate, `no renditions with default or auto-select sound found`);\n return selected;\n }\n if (audioCodecPreference && candidate.indexOf(audioCodecPreference.substring(0, 4)) % 5 !== 0) {\n logStartCodecCandidateIgnored(candidate, `audio codec preference \"${audioCodecPreference}\" not found`);\n return selected;\n }\n if (channelsPreference && !preferStereo) {\n if (!candidateTier.channels[channelsPreference]) {\n logStartCodecCandidateIgnored(candidate, `no renditions with ${channelsPreference} channel sound found (channels options: ${Object.keys(candidateTier.channels)})`);\n return selected;\n }\n } else if ((!audioCodecPreference || preferStereo) && hasStereo && candidateTier.channels['2'] === 0) {\n logStartCodecCandidateIgnored(candidate, `no renditions with stereo sound found`);\n return selected;\n }\n if (candidateTier.minHeight > maxHeight) {\n logStartCodecCandidateIgnored(candidate, `min resolution of ${candidateTier.minHeight} > maximum of ${maxHeight}`);\n return selected;\n }\n if (candidateTier.minFramerate > maxFramerate) {\n logStartCodecCandidateIgnored(candidate, `min framerate of ${candidateTier.minFramerate} > maximum of ${maxFramerate}`);\n return selected;\n }\n if (!videoRanges.some(range => candidateTier.videoRanges[range] > 0)) {\n logStartCodecCandidateIgnored(candidate, `no variants with VIDEO-RANGE of ${JSON.stringify(videoRanges)} found`);\n return selected;\n }\n if (candidateTier.maxScore < selectedScore) {\n logStartCodecCandidateIgnored(candidate, `max score of ${candidateTier.maxScore} < selected max of ${selectedScore}`);\n return selected;\n }\n // Remove candiates with less preferred codecs or more errors\n if (selected && (codecsSetSelectionPreferenceValue(candidate) >= codecsSetSelectionPreferenceValue(selected) || candidateTier.fragmentError > codecTiers[selected].fragmentError)) {\n return selected;\n }\n selectedScore = candidateTier.maxScore;\n return candidate;\n }, undefined);\n return {\n codecSet,\n videoRanges,\n preferHDR,\n minFramerate,\n minBitrate\n };\n}\nfunction logStartCodecCandidateIgnored(codeSet, reason) {\n logger.log(`[abr] start candidates with \"${codeSet}\" ignored because ${reason}`);\n}\nfunction getAudioTracksByGroup(allAudioTracks) {\n return allAudioTracks.reduce((audioTracksByGroup, track) => {\n let trackGroup = audioTracksByGroup.groups[track.groupId];\n if (!trackGroup) {\n trackGroup = audioTracksByGroup.groups[track.groupId] = {\n tracks: [],\n channels: {\n 2: 0\n },\n hasDefault: false,\n hasAutoSelect: false\n };\n }\n trackGroup.tracks.push(track);\n const channelsKey = track.channels || '2';\n trackGroup.channels[channelsKey] = (trackGroup.channels[channelsKey] || 0) + 1;\n trackGroup.hasDefault = trackGroup.hasDefault || track.default;\n trackGroup.hasAutoSelect = trackGroup.hasAutoSelect || track.autoselect;\n if (trackGroup.hasDefault) {\n audioTracksByGroup.hasDefaultAudio = true;\n }\n if (trackGroup.hasAutoSelect) {\n audioTracksByGroup.hasAutoSelectAudio = true;\n }\n return audioTracksByGroup;\n }, {\n hasDefaultAudio: false,\n hasAutoSelectAudio: false,\n groups: {}\n });\n}\nfunction getCodecTiers(levels, audioTracksByGroup, minAutoLevel, maxAutoLevel) {\n return levels.slice(minAutoLevel, maxAutoLevel + 1).reduce((tiers, level) => {\n if (!level.codecSet) {\n return tiers;\n }\n const audioGroups = level.audioGroups;\n let tier = tiers[level.codecSet];\n if (!tier) {\n tiers[level.codecSet] = tier = {\n minBitrate: Infinity,\n minHeight: Infinity,\n minFramerate: Infinity,\n maxScore: 0,\n videoRanges: {\n SDR: 0\n },\n channels: {\n '2': 0\n },\n hasDefaultAudio: !audioGroups,\n fragmentError: 0\n };\n }\n tier.minBitrate = Math.min(tier.minBitrate, level.bitrate);\n const lesserWidthOrHeight = Math.min(level.height, level.width);\n tier.minHeight = Math.min(tier.minHeight, lesserWidthOrHeight);\n tier.minFramerate = Math.min(tier.minFramerate, level.frameRate);\n tier.maxScore = Math.max(tier.maxScore, level.score);\n tier.fragmentError += level.fragmentError;\n tier.videoRanges[level.videoRange] = (tier.videoRanges[level.videoRange] || 0) + 1;\n if (audioGroups) {\n audioGroups.forEach(audioGroupId => {\n if (!audioGroupId) {\n return;\n }\n const audioGroup = audioTracksByGroup.groups[audioGroupId];\n if (!audioGroup) {\n return;\n }\n // Default audio is any group with DEFAULT=YES, or if missing then any group with AUTOSELECT=YES, or all variants\n tier.hasDefaultAudio = tier.hasDefaultAudio || audioTracksByGroup.hasDefaultAudio ? audioGroup.hasDefault : audioGroup.hasAutoSelect || !audioTracksByGroup.hasDefaultAudio && !audioTracksByGroup.hasAutoSelectAudio;\n Object.keys(audioGroup.channels).forEach(channels => {\n tier.channels[channels] = (tier.channels[channels] || 0) + audioGroup.channels[channels];\n });\n });\n }\n return tiers;\n }, {});\n}\nfunction findMatchingOption(option, tracks, matchPredicate) {\n if ('attrs' in option) {\n const index = tracks.indexOf(option);\n if (index !== -1) {\n return index;\n }\n }\n for (let i = 0; i < tracks.length; i++) {\n const track = tracks[i];\n if (matchesOption(option, track, matchPredicate)) {\n return i;\n }\n }\n return -1;\n}\nfunction matchesOption(option, track, matchPredicate) {\n const {\n groupId,\n name,\n lang,\n assocLang,\n characteristics,\n default: isDefault\n } = option;\n const forced = option.forced;\n return (groupId === undefined || track.groupId === groupId) && (name === undefined || track.name === name) && (lang === undefined || track.lang === lang) && (lang === undefined || track.assocLang === assocLang) && (isDefault === undefined || track.default === isDefault) && (forced === undefined || track.forced === forced) && (characteristics === undefined || characteristicsMatch(characteristics, track.characteristics)) && (matchPredicate === undefined || matchPredicate(option, track));\n}\nfunction characteristicsMatch(characteristicsA, characteristicsB = '') {\n const arrA = characteristicsA.split(',');\n const arrB = characteristicsB.split(',');\n // Expects each item to be unique:\n return arrA.length === arrB.length && !arrA.some(el => arrB.indexOf(el) === -1);\n}\nfunction audioMatchPredicate(option, track) {\n const {\n audioCodec,\n channels\n } = option;\n return (audioCodec === undefined || (track.audioCodec || '').substring(0, 4) === audioCodec.substring(0, 4)) && (channels === undefined || channels === (track.channels || '2'));\n}\nfunction findClosestLevelWithAudioGroup(option, levels, allAudioTracks, searchIndex, matchPredicate) {\n const currentLevel = levels[searchIndex];\n // Are there variants with same URI as current level?\n // If so, find a match that does not require any level URI change\n const variants = levels.reduce((variantMap, level, index) => {\n const uri = level.uri;\n const renditions = variantMap[uri] || (variantMap[uri] = []);\n renditions.push(index);\n return variantMap;\n }, {});\n const renditions = variants[currentLevel.uri];\n if (renditions.length > 1) {\n searchIndex = Math.max.apply(Math, renditions);\n }\n // Find best match\n const currentVideoRange = currentLevel.videoRange;\n const currentFrameRate = currentLevel.frameRate;\n const currentVideoCodec = currentLevel.codecSet.substring(0, 4);\n const matchingVideo = searchDownAndUpList(levels, searchIndex, level => {\n if (level.videoRange !== currentVideoRange || level.frameRate !== currentFrameRate || level.codecSet.substring(0, 4) !== currentVideoCodec) {\n return false;\n }\n const audioGroups = level.audioGroups;\n const tracks = allAudioTracks.filter(track => !audioGroups || audioGroups.indexOf(track.groupId) !== -1);\n return findMatchingOption(option, tracks, matchPredicate) > -1;\n });\n if (matchingVideo > -1) {\n return matchingVideo;\n }\n return searchDownAndUpList(levels, searchIndex, level => {\n const audioGroups = level.audioGroups;\n const tracks = allAudioTracks.filter(track => !audioGroups || audioGroups.indexOf(track.groupId) !== -1);\n return findMatchingOption(option, tracks, matchPredicate) > -1;\n });\n}\nfunction searchDownAndUpList(arr, searchIndex, predicate) {\n for (let i = searchIndex; i; i--) {\n if (predicate(arr[i])) {\n return i;\n }\n }\n for (let i = searchIndex + 1; i < arr.length; i++) {\n if (predicate(arr[i])) {\n return i;\n }\n }\n return -1;\n}\n\nclass AbrController {\n constructor(_hls) {\n this.hls = void 0;\n this.lastLevelLoadSec = 0;\n this.lastLoadedFragLevel = -1;\n this.firstSelection = -1;\n this._nextAutoLevel = -1;\n this.nextAutoLevelKey = '';\n this.audioTracksByGroup = null;\n this.codecTiers = null;\n this.timer = -1;\n this.fragCurrent = null;\n this.partCurrent = null;\n this.bitrateTestDelay = 0;\n this.bwEstimator = void 0;\n /*\n This method monitors the download rate of the current fragment, and will downswitch if that fragment will not load\n quickly enough to prevent underbuffering\n */\n this._abandonRulesCheck = () => {\n const {\n fragCurrent: frag,\n partCurrent: part,\n hls\n } = this;\n const {\n autoLevelEnabled,\n media\n } = hls;\n if (!frag || !media) {\n return;\n }\n const now = performance.now();\n const stats = part ? part.stats : frag.stats;\n const duration = part ? part.duration : frag.duration;\n const timeLoading = now - stats.loading.start;\n const minAutoLevel = hls.minAutoLevel;\n // If frag loading is aborted, complete, or from lowest level, stop timer and return\n if (stats.aborted || stats.loaded && stats.loaded === stats.total || frag.level <= minAutoLevel) {\n this.clearTimer();\n // reset forced auto level value so that next level will be selected\n this._nextAutoLevel = -1;\n return;\n }\n\n // This check only runs if we're in ABR mode and actually playing\n if (!autoLevelEnabled || media.paused || !media.playbackRate || !media.readyState) {\n return;\n }\n const bufferInfo = hls.mainForwardBufferInfo;\n if (bufferInfo === null) {\n return;\n }\n const ttfbEstimate = this.bwEstimator.getEstimateTTFB();\n const playbackRate = Math.abs(media.playbackRate);\n // To maintain stable adaptive playback, only begin monitoring frag loading after half or more of its playback duration has passed\n if (timeLoading <= Math.max(ttfbEstimate, 1000 * (duration / (playbackRate * 2)))) {\n return;\n }\n\n // bufferStarvationDelay is an estimate of the amount time (in seconds) it will take to exhaust the buffer\n const bufferStarvationDelay = bufferInfo.len / playbackRate;\n const ttfb = stats.loading.first ? stats.loading.first - stats.loading.start : -1;\n const loadedFirstByte = stats.loaded && ttfb > -1;\n const bwEstimate = this.getBwEstimate();\n const levels = hls.levels;\n const level = levels[frag.level];\n const expectedLen = stats.total || Math.max(stats.loaded, Math.round(duration * level.averageBitrate / 8));\n let timeStreaming = loadedFirstByte ? timeLoading - ttfb : timeLoading;\n if (timeStreaming < 1 && loadedFirstByte) {\n timeStreaming = Math.min(timeLoading, stats.loaded * 8 / bwEstimate);\n }\n const loadRate = loadedFirstByte ? stats.loaded * 1000 / timeStreaming : 0;\n // fragLoadDelay is an estimate of the time (in seconds) it will take to buffer the remainder of the fragment\n const fragLoadedDelay = loadRate ? (expectedLen - stats.loaded) / loadRate : expectedLen * 8 / bwEstimate + ttfbEstimate / 1000;\n // Only downswitch if the time to finish loading the current fragment is greater than the amount of buffer left\n if (fragLoadedDelay <= bufferStarvationDelay) {\n return;\n }\n const bwe = loadRate ? loadRate * 8 : bwEstimate;\n let fragLevelNextLoadedDelay = Number.POSITIVE_INFINITY;\n let nextLoadLevel;\n // Iterate through lower level and try to find the largest one that avoids rebuffering\n for (nextLoadLevel = frag.level - 1; nextLoadLevel > minAutoLevel; nextLoadLevel--) {\n // compute time to load next fragment at lower level\n // 8 = bits per byte (bps/Bps)\n const levelNextBitrate = levels[nextLoadLevel].maxBitrate;\n fragLevelNextLoadedDelay = this.getTimeToLoadFrag(ttfbEstimate / 1000, bwe, duration * levelNextBitrate, !levels[nextLoadLevel].details);\n if (fragLevelNextLoadedDelay < bufferStarvationDelay) {\n break;\n }\n }\n // Only emergency switch down if it takes less time to load a new fragment at lowest level instead of continuing\n // to load the current one\n if (fragLevelNextLoadedDelay >= fragLoadedDelay) {\n return;\n }\n\n // if estimated load time of new segment is completely unreasonable, ignore and do not emergency switch down\n if (fragLevelNextLoadedDelay > duration * 10) {\n return;\n }\n hls.nextLoadLevel = hls.nextAutoLevel = nextLoadLevel;\n if (loadedFirstByte) {\n // If there has been loading progress, sample bandwidth using loading time offset by minimum TTFB time\n this.bwEstimator.sample(timeLoading - Math.min(ttfbEstimate, ttfb), stats.loaded);\n } else {\n // If there has been no loading progress, sample TTFB\n this.bwEstimator.sampleTTFB(timeLoading);\n }\n const nextLoadLevelBitrate = levels[nextLoadLevel].maxBitrate;\n if (this.getBwEstimate() * this.hls.config.abrBandWidthUpFactor > nextLoadLevelBitrate) {\n this.resetEstimator(nextLoadLevelBitrate);\n }\n this.clearTimer();\n logger.warn(`[abr] Fragment ${frag.sn}${part ? ' part ' + part.index : ''} of level ${frag.level} is loading too slowly;\n Time to underbuffer: ${bufferStarvationDelay.toFixed(3)} s\n Estimated load time for current fragment: ${fragLoadedDelay.toFixed(3)} s\n Estimated load time for down switch fragment: ${fragLevelNextLoadedDelay.toFixed(3)} s\n TTFB estimate: ${ttfb | 0} ms\n Current BW estimate: ${isFiniteNumber(bwEstimate) ? bwEstimate | 0 : 'Unknown'} bps\n New BW estimate: ${this.getBwEstimate() | 0} bps\n Switching to level ${nextLoadLevel} @ ${nextLoadLevelBitrate | 0} bps`);\n hls.trigger(Events.FRAG_LOAD_EMERGENCY_ABORTED, {\n frag,\n part,\n stats\n });\n };\n this.hls = _hls;\n this.bwEstimator = this.initEstimator();\n this.registerListeners();\n }\n resetEstimator(abrEwmaDefaultEstimate) {\n if (abrEwmaDefaultEstimate) {\n logger.log(`setting initial bwe to ${abrEwmaDefaultEstimate}`);\n this.hls.config.abrEwmaDefaultEstimate = abrEwmaDefaultEstimate;\n }\n this.firstSelection = -1;\n this.bwEstimator = this.initEstimator();\n }\n initEstimator() {\n const config = this.hls.config;\n return new EwmaBandWidthEstimator(config.abrEwmaSlowVoD, config.abrEwmaFastVoD, config.abrEwmaDefaultEstimate);\n }\n registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.FRAG_LOADING, this.onFragLoading, this);\n hls.on(Events.FRAG_LOADED, this.onFragLoaded, this);\n hls.on(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n hls.on(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.on(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.on(Events.LEVELS_UPDATED, this.onLevelsUpdated, this);\n hls.on(Events.MAX_AUTO_LEVEL_UPDATED, this.onMaxAutoLevelUpdated, this);\n hls.on(Events.ERROR, this.onError, this);\n }\n unregisterListeners() {\n const {\n hls\n } = this;\n if (!hls) {\n return;\n }\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.FRAG_LOADING, this.onFragLoading, this);\n hls.off(Events.FRAG_LOADED, this.onFragLoaded, this);\n hls.off(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n hls.off(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.off(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.off(Events.LEVELS_UPDATED, this.onLevelsUpdated, this);\n hls.off(Events.MAX_AUTO_LEVEL_UPDATED, this.onMaxAutoLevelUpdated, this);\n hls.off(Events.ERROR, this.onError, this);\n }\n destroy() {\n this.unregisterListeners();\n this.clearTimer();\n // @ts-ignore\n this.hls = this._abandonRulesCheck = null;\n this.fragCurrent = this.partCurrent = null;\n }\n onManifestLoading(event, data) {\n this.lastLoadedFragLevel = -1;\n this.firstSelection = -1;\n this.lastLevelLoadSec = 0;\n this.fragCurrent = this.partCurrent = null;\n this.onLevelsUpdated();\n this.clearTimer();\n }\n onLevelsUpdated() {\n if (this.lastLoadedFragLevel > -1 && this.fragCurrent) {\n this.lastLoadedFragLevel = this.fragCurrent.level;\n }\n this._nextAutoLevel = -1;\n this.onMaxAutoLevelUpdated();\n this.codecTiers = null;\n this.audioTracksByGroup = null;\n }\n onMaxAutoLevelUpdated() {\n this.firstSelection = -1;\n this.nextAutoLevelKey = '';\n }\n onFragLoading(event, data) {\n const frag = data.frag;\n if (this.ignoreFragment(frag)) {\n return;\n }\n if (!frag.bitrateTest) {\n var _data$part;\n this.fragCurrent = frag;\n this.partCurrent = (_data$part = data.part) != null ? _data$part : null;\n }\n this.clearTimer();\n this.timer = self.setInterval(this._abandonRulesCheck, 100);\n }\n onLevelSwitching(event, data) {\n this.clearTimer();\n }\n onError(event, data) {\n if (data.fatal) {\n return;\n }\n switch (data.details) {\n case ErrorDetails.BUFFER_ADD_CODEC_ERROR:\n case ErrorDetails.BUFFER_APPEND_ERROR:\n // Reset last loaded level so that a new selection can be made after calling recoverMediaError\n this.lastLoadedFragLevel = -1;\n this.firstSelection = -1;\n break;\n case ErrorDetails.FRAG_LOAD_TIMEOUT:\n {\n const frag = data.frag;\n const {\n fragCurrent,\n partCurrent: part\n } = this;\n if (frag && fragCurrent && frag.sn === fragCurrent.sn && frag.level === fragCurrent.level) {\n const now = performance.now();\n const stats = part ? part.stats : frag.stats;\n const timeLoading = now - stats.loading.start;\n const ttfb = stats.loading.first ? stats.loading.first - stats.loading.start : -1;\n const loadedFirstByte = stats.loaded && ttfb > -1;\n if (loadedFirstByte) {\n const ttfbEstimate = this.bwEstimator.getEstimateTTFB();\n this.bwEstimator.sample(timeLoading - Math.min(ttfbEstimate, ttfb), stats.loaded);\n } else {\n this.bwEstimator.sampleTTFB(timeLoading);\n }\n }\n break;\n }\n }\n }\n getTimeToLoadFrag(timeToFirstByteSec, bandwidth, fragSizeBits, isSwitch) {\n const fragLoadSec = timeToFirstByteSec + fragSizeBits / bandwidth;\n const playlistLoadSec = isSwitch ? this.lastLevelLoadSec : 0;\n return fragLoadSec + playlistLoadSec;\n }\n onLevelLoaded(event, data) {\n const config = this.hls.config;\n const {\n loading\n } = data.stats;\n const timeLoadingMs = loading.end - loading.start;\n if (isFiniteNumber(timeLoadingMs)) {\n this.lastLevelLoadSec = timeLoadingMs / 1000;\n }\n if (data.details.live) {\n this.bwEstimator.update(config.abrEwmaSlowLive, config.abrEwmaFastLive);\n } else {\n this.bwEstimator.update(config.abrEwmaSlowVoD, config.abrEwmaFastVoD);\n }\n }\n onFragLoaded(event, {\n frag,\n part\n }) {\n const stats = part ? part.stats : frag.stats;\n if (frag.type === PlaylistLevelType.MAIN) {\n this.bwEstimator.sampleTTFB(stats.loading.first - stats.loading.start);\n }\n if (this.ignoreFragment(frag)) {\n return;\n }\n // stop monitoring bw once frag loaded\n this.clearTimer();\n // reset forced auto level value so that next level will be selected\n if (frag.level === this._nextAutoLevel) {\n this._nextAutoLevel = -1;\n }\n this.firstSelection = -1;\n\n // compute level average bitrate\n if (this.hls.config.abrMaxWithRealBitrate) {\n const duration = part ? part.duration : frag.duration;\n const level = this.hls.levels[frag.level];\n const loadedBytes = (level.loaded ? level.loaded.bytes : 0) + stats.loaded;\n const loadedDuration = (level.loaded ? level.loaded.duration : 0) + duration;\n level.loaded = {\n bytes: loadedBytes,\n duration: loadedDuration\n };\n level.realBitrate = Math.round(8 * loadedBytes / loadedDuration);\n }\n if (frag.bitrateTest) {\n const fragBufferedData = {\n stats,\n frag,\n part,\n id: frag.type\n };\n this.onFragBuffered(Events.FRAG_BUFFERED, fragBufferedData);\n frag.bitrateTest = false;\n } else {\n // store level id after successful fragment load for playback\n this.lastLoadedFragLevel = frag.level;\n }\n }\n onFragBuffered(event, data) {\n const {\n frag,\n part\n } = data;\n const stats = part != null && part.stats.loaded ? part.stats : frag.stats;\n if (stats.aborted) {\n return;\n }\n if (this.ignoreFragment(frag)) {\n return;\n }\n // Use the difference between parsing and request instead of buffering and request to compute fragLoadingProcessing;\n // rationale is that buffer appending only happens once media is attached. This can happen when config.startFragPrefetch\n // is used. If we used buffering in that case, our BW estimate sample will be very large.\n const processingMs = stats.parsing.end - stats.loading.start - Math.min(stats.loading.first - stats.loading.start, this.bwEstimator.getEstimateTTFB());\n this.bwEstimator.sample(processingMs, stats.loaded);\n stats.bwEstimate = this.getBwEstimate();\n if (frag.bitrateTest) {\n this.bitrateTestDelay = processingMs / 1000;\n } else {\n this.bitrateTestDelay = 0;\n }\n }\n ignoreFragment(frag) {\n // Only count non-alt-audio frags which were actually buffered in our BW calculations\n return frag.type !== PlaylistLevelType.MAIN || frag.sn === 'initSegment';\n }\n clearTimer() {\n if (this.timer > -1) {\n self.clearInterval(this.timer);\n this.timer = -1;\n }\n }\n get firstAutoLevel() {\n const {\n maxAutoLevel,\n minAutoLevel\n } = this.hls;\n const bwEstimate = this.getBwEstimate();\n const maxStartDelay = this.hls.config.maxStarvationDelay;\n const abrAutoLevel = this.findBestLevel(bwEstimate, minAutoLevel, maxAutoLevel, 0, maxStartDelay, 1, 1);\n if (abrAutoLevel > -1) {\n return abrAutoLevel;\n }\n const firstLevel = this.hls.firstLevel;\n const clamped = Math.min(Math.max(firstLevel, minAutoLevel), maxAutoLevel);\n logger.warn(`[abr] Could not find best starting auto level. Defaulting to first in playlist ${firstLevel} clamped to ${clamped}`);\n return clamped;\n }\n get forcedAutoLevel() {\n if (this.nextAutoLevelKey) {\n return -1;\n }\n return this._nextAutoLevel;\n }\n\n // return next auto level\n get nextAutoLevel() {\n const forcedAutoLevel = this.forcedAutoLevel;\n const bwEstimator = this.bwEstimator;\n const useEstimate = bwEstimator.canEstimate();\n const loadedFirstFrag = this.lastLoadedFragLevel > -1;\n // in case next auto level has been forced, and bw not available or not reliable, return forced value\n if (forcedAutoLevel !== -1 && (!useEstimate || !loadedFirstFrag || this.nextAutoLevelKey === this.getAutoLevelKey())) {\n return forcedAutoLevel;\n }\n\n // compute next level using ABR logic\n const nextABRAutoLevel = useEstimate && loadedFirstFrag ? this.getNextABRAutoLevel() : this.firstAutoLevel;\n\n // use forced auto level while it hasn't errored more than ABR selection\n if (forcedAutoLevel !== -1) {\n const levels = this.hls.levels;\n if (levels.length > Math.max(forcedAutoLevel, nextABRAutoLevel) && levels[forcedAutoLevel].loadError <= levels[nextABRAutoLevel].loadError) {\n return forcedAutoLevel;\n }\n }\n\n // save result until state has changed\n this._nextAutoLevel = nextABRAutoLevel;\n this.nextAutoLevelKey = this.getAutoLevelKey();\n return nextABRAutoLevel;\n }\n getAutoLevelKey() {\n return `${this.getBwEstimate()}_${this.getStarvationDelay().toFixed(2)}`;\n }\n getNextABRAutoLevel() {\n const {\n fragCurrent,\n partCurrent,\n hls\n } = this;\n const {\n maxAutoLevel,\n config,\n minAutoLevel\n } = hls;\n const currentFragDuration = partCurrent ? partCurrent.duration : fragCurrent ? fragCurrent.duration : 0;\n const avgbw = this.getBwEstimate();\n // bufferStarvationDelay is the wall-clock time left until the playback buffer is exhausted.\n const bufferStarvationDelay = this.getStarvationDelay();\n let bwFactor = config.abrBandWidthFactor;\n let bwUpFactor = config.abrBandWidthUpFactor;\n\n // First, look to see if we can find a level matching with our avg bandwidth AND that could also guarantee no rebuffering at all\n if (bufferStarvationDelay) {\n const _bestLevel = this.findBestLevel(avgbw, minAutoLevel, maxAutoLevel, bufferStarvationDelay, 0, bwFactor, bwUpFactor);\n if (_bestLevel >= 0) {\n return _bestLevel;\n }\n }\n // not possible to get rid of rebuffering... try to find level that will guarantee less than maxStarvationDelay of rebuffering\n let maxStarvationDelay = currentFragDuration ? Math.min(currentFragDuration, config.maxStarvationDelay) : config.maxStarvationDelay;\n if (!bufferStarvationDelay) {\n // in case buffer is empty, let's check if previous fragment was loaded to perform a bitrate test\n const bitrateTestDelay = this.bitrateTestDelay;\n if (bitrateTestDelay) {\n // if it is the case, then we need to adjust our max starvation delay using maxLoadingDelay config value\n // max video loading delay used in automatic start level selection :\n // in that mode ABR controller will ensure that video loading time (ie the time to fetch the first fragment at lowest quality level +\n // the time to fetch the fragment at the appropriate quality level is less than ```maxLoadingDelay``` )\n // cap maxLoadingDelay and ensure it is not bigger 'than bitrate test' frag duration\n const maxLoadingDelay = currentFragDuration ? Math.min(currentFragDuration, config.maxLoadingDelay) : config.maxLoadingDelay;\n maxStarvationDelay = maxLoadingDelay - bitrateTestDelay;\n logger.info(`[abr] bitrate test took ${Math.round(1000 * bitrateTestDelay)}ms, set first fragment max fetchDuration to ${Math.round(1000 * maxStarvationDelay)} ms`);\n // don't use conservative factor on bitrate test\n bwFactor = bwUpFactor = 1;\n }\n }\n const bestLevel = this.findBestLevel(avgbw, minAutoLevel, maxAutoLevel, bufferStarvationDelay, maxStarvationDelay, bwFactor, bwUpFactor);\n logger.info(`[abr] ${bufferStarvationDelay ? 'rebuffering expected' : 'buffer is empty'}, optimal quality level ${bestLevel}`);\n if (bestLevel > -1) {\n return bestLevel;\n }\n // If no matching level found, see if min auto level would be a better option\n const minLevel = hls.levels[minAutoLevel];\n const autoLevel = hls.levels[hls.loadLevel];\n if ((minLevel == null ? void 0 : minLevel.bitrate) < (autoLevel == null ? void 0 : autoLevel.bitrate)) {\n return minAutoLevel;\n }\n // or if bitrate is not lower, continue to use loadLevel\n return hls.loadLevel;\n }\n getStarvationDelay() {\n const hls = this.hls;\n const media = hls.media;\n if (!media) {\n return Infinity;\n }\n // playbackRate is the absolute value of the playback rate; if media.playbackRate is 0, we use 1 to load as\n // if we're playing back at the normal rate.\n const playbackRate = media && media.playbackRate !== 0 ? Math.abs(media.playbackRate) : 1.0;\n const bufferInfo = hls.mainForwardBufferInfo;\n return (bufferInfo ? bufferInfo.len : 0) / playbackRate;\n }\n getBwEstimate() {\n return this.bwEstimator.canEstimate() ? this.bwEstimator.getEstimate() : this.hls.config.abrEwmaDefaultEstimate;\n }\n findBestLevel(currentBw, minAutoLevel, maxAutoLevel, bufferStarvationDelay, maxStarvationDelay, bwFactor, bwUpFactor) {\n var _level$details;\n const maxFetchDuration = bufferStarvationDelay + maxStarvationDelay;\n const lastLoadedFragLevel = this.lastLoadedFragLevel;\n const selectionBaseLevel = lastLoadedFragLevel === -1 ? this.hls.firstLevel : lastLoadedFragLevel;\n const {\n fragCurrent,\n partCurrent\n } = this;\n const {\n levels,\n allAudioTracks,\n loadLevel,\n config\n } = this.hls;\n if (levels.length === 1) {\n return 0;\n }\n const level = levels[selectionBaseLevel];\n const live = !!(level != null && (_level$details = level.details) != null && _level$details.live);\n const firstSelection = loadLevel === -1 || lastLoadedFragLevel === -1;\n let currentCodecSet;\n let currentVideoRange = 'SDR';\n let currentFrameRate = (level == null ? void 0 : level.frameRate) || 0;\n const {\n audioPreference,\n videoPreference\n } = config;\n const audioTracksByGroup = this.audioTracksByGroup || (this.audioTracksByGroup = getAudioTracksByGroup(allAudioTracks));\n if (firstSelection) {\n if (this.firstSelection !== -1) {\n return this.firstSelection;\n }\n const codecTiers = this.codecTiers || (this.codecTiers = getCodecTiers(levels, audioTracksByGroup, minAutoLevel, maxAutoLevel));\n const startTier = getStartCodecTier(codecTiers, currentVideoRange, currentBw, audioPreference, videoPreference);\n const {\n codecSet,\n videoRanges,\n minFramerate,\n minBitrate,\n preferHDR\n } = startTier;\n currentCodecSet = codecSet;\n currentVideoRange = preferHDR ? videoRanges[videoRanges.length - 1] : videoRanges[0];\n currentFrameRate = minFramerate;\n currentBw = Math.max(currentBw, minBitrate);\n logger.log(`[abr] picked start tier ${JSON.stringify(startTier)}`);\n } else {\n currentCodecSet = level == null ? void 0 : level.codecSet;\n currentVideoRange = level == null ? void 0 : level.videoRange;\n }\n const currentFragDuration = partCurrent ? partCurrent.duration : fragCurrent ? fragCurrent.duration : 0;\n const ttfbEstimateSec = this.bwEstimator.getEstimateTTFB() / 1000;\n const levelsSkipped = [];\n for (let i = maxAutoLevel; i >= minAutoLevel; i--) {\n var _levelInfo$supportedR;\n const levelInfo = levels[i];\n const upSwitch = i > selectionBaseLevel;\n if (!levelInfo) {\n continue;\n }\n if (config.useMediaCapabilities && !levelInfo.supportedResult && !levelInfo.supportedPromise) {\n const mediaCapabilities = navigator.mediaCapabilities;\n if (typeof (mediaCapabilities == null ? void 0 : mediaCapabilities.decodingInfo) === 'function' && requiresMediaCapabilitiesDecodingInfo(levelInfo, audioTracksByGroup, currentVideoRange, currentFrameRate, currentBw, audioPreference)) {\n levelInfo.supportedPromise = getMediaDecodingInfoPromise(levelInfo, audioTracksByGroup, mediaCapabilities);\n levelInfo.supportedPromise.then(decodingInfo => {\n if (!this.hls) {\n return;\n }\n levelInfo.supportedResult = decodingInfo;\n const levels = this.hls.levels;\n const index = levels.indexOf(levelInfo);\n if (decodingInfo.error) {\n logger.warn(`[abr] MediaCapabilities decodingInfo error: \"${decodingInfo.error}\" for level ${index} ${JSON.stringify(decodingInfo)}`);\n } else if (!decodingInfo.supported) {\n logger.warn(`[abr] Unsupported MediaCapabilities decodingInfo result for level ${index} ${JSON.stringify(decodingInfo)}`);\n if (index > -1 && levels.length > 1) {\n logger.log(`[abr] Removing unsupported level ${index}`);\n this.hls.removeLevel(index);\n }\n }\n });\n } else {\n levelInfo.supportedResult = SUPPORTED_INFO_DEFAULT;\n }\n }\n\n // skip candidates which change codec-family or video-range,\n // and which decrease or increase frame-rate for up and down-switch respectfully\n if (currentCodecSet && levelInfo.codecSet !== currentCodecSet || currentVideoRange && levelInfo.videoRange !== currentVideoRange || upSwitch && currentFrameRate > levelInfo.frameRate || !upSwitch && currentFrameRate > 0 && currentFrameRate < levelInfo.frameRate || levelInfo.supportedResult && !((_levelInfo$supportedR = levelInfo.supportedResult.decodingInfoResults) != null && _levelInfo$supportedR[0].smooth)) {\n levelsSkipped.push(i);\n continue;\n }\n const levelDetails = levelInfo.details;\n const avgDuration = (partCurrent ? levelDetails == null ? void 0 : levelDetails.partTarget : levelDetails == null ? void 0 : levelDetails.averagetargetduration) || currentFragDuration;\n let adjustedbw;\n // follow algorithm captured from stagefright :\n // https://android.googlesource.com/platform/frameworks/av/+/master/media/libstagefright/httplive/LiveSession.cpp\n // Pick the highest bandwidth stream below or equal to estimated bandwidth.\n // consider only 80% of the available bandwidth, but if we are switching up,\n // be even more conservative (70%) to avoid overestimating and immediately\n // switching back.\n if (!upSwitch) {\n adjustedbw = bwFactor * currentBw;\n } else {\n adjustedbw = bwUpFactor * currentBw;\n }\n\n // Use average bitrate when starvation delay (buffer length) is gt or eq two segment durations and rebuffering is not expected (maxStarvationDelay > 0)\n const bitrate = currentFragDuration && bufferStarvationDelay >= currentFragDuration * 2 && maxStarvationDelay === 0 ? levels[i].averageBitrate : levels[i].maxBitrate;\n const fetchDuration = this.getTimeToLoadFrag(ttfbEstimateSec, adjustedbw, bitrate * avgDuration, levelDetails === undefined);\n const canSwitchWithinTolerance =\n // if adjusted bw is greater than level bitrate AND\n adjustedbw >= bitrate && (\n // no level change, or new level has no error history\n i === lastLoadedFragLevel || levelInfo.loadError === 0 && levelInfo.fragmentError === 0) && (\n // fragment fetchDuration unknown OR live stream OR fragment fetchDuration less than max allowed fetch duration, then this level matches\n // we don't account for max Fetch Duration for live streams, this is to avoid switching down when near the edge of live sliding window ...\n // special case to support startLevel = -1 (bitrateTest) on live streams : in that case we should not exit loop so that findBestLevel will return -1\n fetchDuration <= ttfbEstimateSec || !isFiniteNumber(fetchDuration) || live && !this.bitrateTestDelay || fetchDuration < maxFetchDuration);\n if (canSwitchWithinTolerance) {\n const forcedAutoLevel = this.forcedAutoLevel;\n if (i !== loadLevel && (forcedAutoLevel === -1 || forcedAutoLevel !== loadLevel)) {\n if (levelsSkipped.length) {\n logger.trace(`[abr] Skipped level(s) ${levelsSkipped.join(',')} of ${maxAutoLevel} max with CODECS and VIDEO-RANGE:\"${levels[levelsSkipped[0]].codecs}\" ${levels[levelsSkipped[0]].videoRange}; not compatible with \"${level.codecs}\" ${currentVideoRange}`);\n }\n logger.info(`[abr] switch candidate:${selectionBaseLevel}->${i} adjustedbw(${Math.round(adjustedbw)})-bitrate=${Math.round(adjustedbw - bitrate)} ttfb:${ttfbEstimateSec.toFixed(1)} avgDuration:${avgDuration.toFixed(1)} maxFetchDuration:${maxFetchDuration.toFixed(1)} fetchDuration:${fetchDuration.toFixed(1)} firstSelection:${firstSelection} codecSet:${currentCodecSet} videoRange:${currentVideoRange} hls.loadLevel:${loadLevel}`);\n }\n if (firstSelection) {\n this.firstSelection = i;\n }\n // as we are looping from highest to lowest, this will return the best achievable quality level\n return i;\n }\n }\n // not enough time budget even with quality level 0 ... rebuffering might happen\n return -1;\n }\n set nextAutoLevel(nextLevel) {\n const {\n maxAutoLevel,\n minAutoLevel\n } = this.hls;\n const value = Math.min(Math.max(nextLevel, minAutoLevel), maxAutoLevel);\n if (this._nextAutoLevel !== value) {\n this.nextAutoLevelKey = '';\n this._nextAutoLevel = value;\n }\n }\n}\n\n/**\n * @ignore\n * Sub-class specialization of EventHandler base class.\n *\n * TaskLoop allows to schedule a task function being called (optionnaly repeatedly) on the main loop,\n * scheduled asynchroneously, avoiding recursive calls in the same tick.\n *\n * The task itself is implemented in `doTick`. It can be requested and called for single execution\n * using the `tick` method.\n *\n * It will be assured that the task execution method (`tick`) only gets called once per main loop \"tick\",\n * no matter how often it gets requested for execution. Execution in further ticks will be scheduled accordingly.\n *\n * If further execution requests have already been scheduled on the next tick, it can be checked with `hasNextTick`,\n * and cancelled with `clearNextTick`.\n *\n * The task can be scheduled as an interval repeatedly with a period as parameter (see `setInterval`, `clearInterval`).\n *\n * Sub-classes need to implement the `doTick` method which will effectively have the task execution routine.\n *\n * Further explanations:\n *\n * The baseclass has a `tick` method that will schedule the doTick call. It may be called synchroneously\n * only for a stack-depth of one. On re-entrant calls, sub-sequent calls are scheduled for next main loop ticks.\n *\n * When the task execution (`tick` method) is called in re-entrant way this is detected and\n * we are limiting the task execution per call stack to exactly one, but scheduling/post-poning further\n * task processing on the next main loop iteration (also known as \"next tick\" in the Node/JS runtime lingo).\n */\nclass TaskLoop {\n constructor() {\n this._boundTick = void 0;\n this._tickTimer = null;\n this._tickInterval = null;\n this._tickCallCount = 0;\n this._boundTick = this.tick.bind(this);\n }\n destroy() {\n this.onHandlerDestroying();\n this.onHandlerDestroyed();\n }\n onHandlerDestroying() {\n // clear all timers before unregistering from event bus\n this.clearNextTick();\n this.clearInterval();\n }\n onHandlerDestroyed() {}\n hasInterval() {\n return !!this._tickInterval;\n }\n hasNextTick() {\n return !!this._tickTimer;\n }\n\n /**\n * @param millis - Interval time (ms)\n * @eturns True when interval has been scheduled, false when already scheduled (no effect)\n */\n setInterval(millis) {\n if (!this._tickInterval) {\n this._tickCallCount = 0;\n this._tickInterval = self.setInterval(this._boundTick, millis);\n return true;\n }\n return false;\n }\n\n /**\n * @returns True when interval was cleared, false when none was set (no effect)\n */\n clearInterval() {\n if (this._tickInterval) {\n self.clearInterval(this._tickInterval);\n this._tickInterval = null;\n return true;\n }\n return false;\n }\n\n /**\n * @returns True when timeout was cleared, false when none was set (no effect)\n */\n clearNextTick() {\n if (this._tickTimer) {\n self.clearTimeout(this._tickTimer);\n this._tickTimer = null;\n return true;\n }\n return false;\n }\n\n /**\n * Will call the subclass doTick implementation in this main loop tick\n * or in the next one (via setTimeout(,0)) in case it has already been called\n * in this tick (in case this is a re-entrant call).\n */\n tick() {\n this._tickCallCount++;\n if (this._tickCallCount === 1) {\n this.doTick();\n // re-entrant call to tick from previous doTick call stack\n // -> schedule a call on the next main loop iteration to process this task processing request\n if (this._tickCallCount > 1) {\n // make sure only one timer exists at any time at max\n this.tickImmediate();\n }\n this._tickCallCount = 0;\n }\n }\n tickImmediate() {\n this.clearNextTick();\n this._tickTimer = self.setTimeout(this._boundTick, 0);\n }\n\n /**\n * For subclass to implement task logic\n * @abstract\n */\n doTick() {}\n}\n\nvar FragmentState = {\n NOT_LOADED: \"NOT_LOADED\",\n APPENDING: \"APPENDING\",\n PARTIAL: \"PARTIAL\",\n OK: \"OK\"\n};\nclass FragmentTracker {\n constructor(hls) {\n this.activePartLists = Object.create(null);\n this.endListFragments = Object.create(null);\n this.fragments = Object.create(null);\n this.timeRanges = Object.create(null);\n this.bufferPadding = 0.2;\n this.hls = void 0;\n this.hasGaps = false;\n this.hls = hls;\n this._registerListeners();\n }\n _registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.BUFFER_APPENDED, this.onBufferAppended, this);\n hls.on(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n hls.on(Events.FRAG_LOADED, this.onFragLoaded, this);\n }\n _unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.BUFFER_APPENDED, this.onBufferAppended, this);\n hls.off(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n hls.off(Events.FRAG_LOADED, this.onFragLoaded, this);\n }\n destroy() {\n this._unregisterListeners();\n // @ts-ignore\n this.fragments =\n // @ts-ignore\n this.activePartLists =\n // @ts-ignore\n this.endListFragments = this.timeRanges = null;\n }\n\n /**\n * Return a Fragment or Part with an appended range that matches the position and levelType\n * Otherwise, return null\n */\n getAppendedFrag(position, levelType) {\n const activeParts = this.activePartLists[levelType];\n if (activeParts) {\n for (let i = activeParts.length; i--;) {\n const activePart = activeParts[i];\n if (!activePart) {\n break;\n }\n const appendedPTS = activePart.end;\n if (activePart.start <= position && appendedPTS !== null && position <= appendedPTS) {\n return activePart;\n }\n }\n }\n return this.getBufferedFrag(position, levelType);\n }\n\n /**\n * Return a buffered Fragment that matches the position and levelType.\n * A buffered Fragment is one whose loading, parsing and appending is done (completed or \"partial\" meaning aborted).\n * If not found any Fragment, return null\n */\n getBufferedFrag(position, levelType) {\n const {\n fragments\n } = this;\n const keys = Object.keys(fragments);\n for (let i = keys.length; i--;) {\n const fragmentEntity = fragments[keys[i]];\n if ((fragmentEntity == null ? void 0 : fragmentEntity.body.type) === levelType && fragmentEntity.buffered) {\n const frag = fragmentEntity.body;\n if (frag.start <= position && position <= frag.end) {\n return frag;\n }\n }\n }\n return null;\n }\n\n /**\n * Partial fragments effected by coded frame eviction will be removed\n * The browser will unload parts of the buffer to free up memory for new buffer data\n * Fragments will need to be reloaded when the buffer is freed up, removing partial fragments will allow them to reload(since there might be parts that are still playable)\n */\n detectEvictedFragments(elementaryStream, timeRange, playlistType, appendedPart) {\n if (this.timeRanges) {\n this.timeRanges[elementaryStream] = timeRange;\n }\n // Check if any flagged fragments have been unloaded\n // excluding anything newer than appendedPartSn\n const appendedPartSn = (appendedPart == null ? void 0 : appendedPart.fragment.sn) || -1;\n Object.keys(this.fragments).forEach(key => {\n const fragmentEntity = this.fragments[key];\n if (!fragmentEntity) {\n return;\n }\n if (appendedPartSn >= fragmentEntity.body.sn) {\n return;\n }\n if (!fragmentEntity.buffered && !fragmentEntity.loaded) {\n if (fragmentEntity.body.type === playlistType) {\n this.removeFragment(fragmentEntity.body);\n }\n return;\n }\n const esData = fragmentEntity.range[elementaryStream];\n if (!esData) {\n return;\n }\n esData.time.some(time => {\n const isNotBuffered = !this.isTimeBuffered(time.startPTS, time.endPTS, timeRange);\n if (isNotBuffered) {\n // Unregister partial fragment as it needs to load again to be reused\n this.removeFragment(fragmentEntity.body);\n }\n return isNotBuffered;\n });\n });\n }\n\n /**\n * Checks if the fragment passed in is loaded in the buffer properly\n * Partially loaded fragments will be registered as a partial fragment\n */\n detectPartialFragments(data) {\n const timeRanges = this.timeRanges;\n const {\n frag,\n part\n } = data;\n if (!timeRanges || frag.sn === 'initSegment') {\n return;\n }\n const fragKey = getFragmentKey(frag);\n const fragmentEntity = this.fragments[fragKey];\n if (!fragmentEntity || fragmentEntity.buffered && frag.gap) {\n return;\n }\n const isFragHint = !frag.relurl;\n Object.keys(timeRanges).forEach(elementaryStream => {\n const streamInfo = frag.elementaryStreams[elementaryStream];\n if (!streamInfo) {\n return;\n }\n const timeRange = timeRanges[elementaryStream];\n const partial = isFragHint || streamInfo.partial === true;\n fragmentEntity.range[elementaryStream] = this.getBufferedTimes(frag, part, partial, timeRange);\n });\n fragmentEntity.loaded = null;\n if (Object.keys(fragmentEntity.range).length) {\n fragmentEntity.buffered = true;\n const endList = fragmentEntity.body.endList = frag.endList || fragmentEntity.body.endList;\n if (endList) {\n this.endListFragments[fragmentEntity.body.type] = fragmentEntity;\n }\n if (!isPartial(fragmentEntity)) {\n // Remove older fragment parts from lookup after frag is tracked as buffered\n this.removeParts(frag.sn - 1, frag.type);\n }\n } else {\n // remove fragment if nothing was appended\n this.removeFragment(fragmentEntity.body);\n }\n }\n removeParts(snToKeep, levelType) {\n const activeParts = this.activePartLists[levelType];\n if (!activeParts) {\n return;\n }\n this.activePartLists[levelType] = activeParts.filter(part => part.fragment.sn >= snToKeep);\n }\n fragBuffered(frag, force) {\n const fragKey = getFragmentKey(frag);\n let fragmentEntity = this.fragments[fragKey];\n if (!fragmentEntity && force) {\n fragmentEntity = this.fragments[fragKey] = {\n body: frag,\n appendedPTS: null,\n loaded: null,\n buffered: false,\n range: Object.create(null)\n };\n if (frag.gap) {\n this.hasGaps = true;\n }\n }\n if (fragmentEntity) {\n fragmentEntity.loaded = null;\n fragmentEntity.buffered = true;\n }\n }\n getBufferedTimes(fragment, part, partial, timeRange) {\n const buffered = {\n time: [],\n partial\n };\n const startPTS = fragment.start;\n const endPTS = fragment.end;\n const minEndPTS = fragment.minEndPTS || endPTS;\n const maxStartPTS = fragment.maxStartPTS || startPTS;\n for (let i = 0; i < timeRange.length; i++) {\n const startTime = timeRange.start(i) - this.bufferPadding;\n const endTime = timeRange.end(i) + this.bufferPadding;\n if (maxStartPTS >= startTime && minEndPTS <= endTime) {\n // Fragment is entirely contained in buffer\n // No need to check the other timeRange times since it's completely playable\n buffered.time.push({\n startPTS: Math.max(startPTS, timeRange.start(i)),\n endPTS: Math.min(endPTS, timeRange.end(i))\n });\n break;\n } else if (startPTS < endTime && endPTS > startTime) {\n const start = Math.max(startPTS, timeRange.start(i));\n const end = Math.min(endPTS, timeRange.end(i));\n if (end > start) {\n buffered.partial = true;\n // Check for intersection with buffer\n // Get playable sections of the fragment\n buffered.time.push({\n startPTS: start,\n endPTS: end\n });\n }\n } else if (endPTS <= startTime) {\n // No need to check the rest of the timeRange as it is in order\n break;\n }\n }\n return buffered;\n }\n\n /**\n * Gets the partial fragment for a certain time\n */\n getPartialFragment(time) {\n let bestFragment = null;\n let timePadding;\n let startTime;\n let endTime;\n let bestOverlap = 0;\n const {\n bufferPadding,\n fragments\n } = this;\n Object.keys(fragments).forEach(key => {\n const fragmentEntity = fragments[key];\n if (!fragmentEntity) {\n return;\n }\n if (isPartial(fragmentEntity)) {\n startTime = fragmentEntity.body.start - bufferPadding;\n endTime = fragmentEntity.body.end + bufferPadding;\n if (time >= startTime && time <= endTime) {\n // Use the fragment that has the most padding from start and end time\n timePadding = Math.min(time - startTime, endTime - time);\n if (bestOverlap <= timePadding) {\n bestFragment = fragmentEntity.body;\n bestOverlap = timePadding;\n }\n }\n }\n });\n return bestFragment;\n }\n isEndListAppended(type) {\n const lastFragmentEntity = this.endListFragments[type];\n return lastFragmentEntity !== undefined && (lastFragmentEntity.buffered || isPartial(lastFragmentEntity));\n }\n getState(fragment) {\n const fragKey = getFragmentKey(fragment);\n const fragmentEntity = this.fragments[fragKey];\n if (fragmentEntity) {\n if (!fragmentEntity.buffered) {\n return FragmentState.APPENDING;\n } else if (isPartial(fragmentEntity)) {\n return FragmentState.PARTIAL;\n } else {\n return FragmentState.OK;\n }\n }\n return FragmentState.NOT_LOADED;\n }\n isTimeBuffered(startPTS, endPTS, timeRange) {\n let startTime;\n let endTime;\n for (let i = 0; i < timeRange.length; i++) {\n startTime = timeRange.start(i) - this.bufferPadding;\n endTime = timeRange.end(i) + this.bufferPadding;\n if (startPTS >= startTime && endPTS <= endTime) {\n return true;\n }\n if (endPTS <= startTime) {\n // No need to check the rest of the timeRange as it is in order\n return false;\n }\n }\n return false;\n }\n onFragLoaded(event, data) {\n const {\n frag,\n part\n } = data;\n // don't track initsegment (for which sn is not a number)\n // don't track frags used for bitrateTest, they're irrelevant.\n if (frag.sn === 'initSegment' || frag.bitrateTest) {\n return;\n }\n\n // Fragment entity `loaded` FragLoadedData is null when loading parts\n const loaded = part ? null : data;\n const fragKey = getFragmentKey(frag);\n this.fragments[fragKey] = {\n body: frag,\n appendedPTS: null,\n loaded,\n buffered: false,\n range: Object.create(null)\n };\n }\n onBufferAppended(event, data) {\n const {\n frag,\n part,\n timeRanges\n } = data;\n if (frag.sn === 'initSegment') {\n return;\n }\n const playlistType = frag.type;\n if (part) {\n let activeParts = this.activePartLists[playlistType];\n if (!activeParts) {\n this.activePartLists[playlistType] = activeParts = [];\n }\n activeParts.push(part);\n }\n // Store the latest timeRanges loaded in the buffer\n this.timeRanges = timeRanges;\n Object.keys(timeRanges).forEach(elementaryStream => {\n const timeRange = timeRanges[elementaryStream];\n this.detectEvictedFragments(elementaryStream, timeRange, playlistType, part);\n });\n }\n onFragBuffered(event, data) {\n this.detectPartialFragments(data);\n }\n hasFragment(fragment) {\n const fragKey = getFragmentKey(fragment);\n return !!this.fragments[fragKey];\n }\n hasParts(type) {\n var _this$activePartLists;\n return !!((_this$activePartLists = this.activePartLists[type]) != null && _this$activePartLists.length);\n }\n removeFragmentsInRange(start, end, playlistType, withGapOnly, unbufferedOnly) {\n if (withGapOnly && !this.hasGaps) {\n return;\n }\n Object.keys(this.fragments).forEach(key => {\n const fragmentEntity = this.fragments[key];\n if (!fragmentEntity) {\n return;\n }\n const frag = fragmentEntity.body;\n if (frag.type !== playlistType || withGapOnly && !frag.gap) {\n return;\n }\n if (frag.start < end && frag.end > start && (fragmentEntity.buffered || unbufferedOnly)) {\n this.removeFragment(frag);\n }\n });\n }\n removeFragment(fragment) {\n const fragKey = getFragmentKey(fragment);\n fragment.stats.loaded = 0;\n fragment.clearElementaryStreamInfo();\n const activeParts = this.activePartLists[fragment.type];\n if (activeParts) {\n const snToRemove = fragment.sn;\n this.activePartLists[fragment.type] = activeParts.filter(part => part.fragment.sn !== snToRemove);\n }\n delete this.fragments[fragKey];\n if (fragment.endList) {\n delete this.endListFragments[fragment.type];\n }\n }\n removeAllFragments() {\n this.fragments = Object.create(null);\n this.endListFragments = Object.create(null);\n this.activePartLists = Object.create(null);\n this.hasGaps = false;\n }\n}\nfunction isPartial(fragmentEntity) {\n var _fragmentEntity$range, _fragmentEntity$range2, _fragmentEntity$range3;\n return fragmentEntity.buffered && (fragmentEntity.body.gap || ((_fragmentEntity$range = fragmentEntity.range.video) == null ? void 0 : _fragmentEntity$range.partial) || ((_fragmentEntity$range2 = fragmentEntity.range.audio) == null ? void 0 : _fragmentEntity$range2.partial) || ((_fragmentEntity$range3 = fragmentEntity.range.audiovideo) == null ? void 0 : _fragmentEntity$range3.partial));\n}\nfunction getFragmentKey(fragment) {\n return `${fragment.type}_${fragment.level}_${fragment.sn}`;\n}\n\n/**\n * Provides methods dealing with buffer length retrieval for example.\n *\n * In general, a helper around HTML5 MediaElement TimeRanges gathered from `buffered` property.\n *\n * Also @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLMediaElement/buffered\n */\n\nconst noopBuffered = {\n length: 0,\n start: () => 0,\n end: () => 0\n};\nclass BufferHelper {\n /**\n * Return true if `media`'s buffered include `position`\n */\n static isBuffered(media, position) {\n try {\n if (media) {\n const buffered = BufferHelper.getBuffered(media);\n for (let i = 0; i < buffered.length; i++) {\n if (position >= buffered.start(i) && position <= buffered.end(i)) {\n return true;\n }\n }\n }\n } catch (error) {\n // this is to catch\n // InvalidStateError: Failed to read the 'buffered' property from 'SourceBuffer':\n // This SourceBuffer has been removed from the parent media source\n }\n return false;\n }\n static bufferInfo(media, pos, maxHoleDuration) {\n try {\n if (media) {\n const vbuffered = BufferHelper.getBuffered(media);\n const buffered = [];\n let i;\n for (i = 0; i < vbuffered.length; i++) {\n buffered.push({\n start: vbuffered.start(i),\n end: vbuffered.end(i)\n });\n }\n return this.bufferedInfo(buffered, pos, maxHoleDuration);\n }\n } catch (error) {\n // this is to catch\n // InvalidStateError: Failed to read the 'buffered' property from 'SourceBuffer':\n // This SourceBuffer has been removed from the parent media source\n }\n return {\n len: 0,\n start: pos,\n end: pos,\n nextStart: undefined\n };\n }\n static bufferedInfo(buffered, pos, maxHoleDuration) {\n pos = Math.max(0, pos);\n // sort on buffer.start/smaller end (IE does not always return sorted buffered range)\n buffered.sort(function (a, b) {\n const diff = a.start - b.start;\n if (diff) {\n return diff;\n } else {\n return b.end - a.end;\n }\n });\n let buffered2 = [];\n if (maxHoleDuration) {\n // there might be some small holes between buffer time range\n // consider that holes smaller than maxHoleDuration are irrelevant and build another\n // buffer time range representations that discards those holes\n for (let i = 0; i < buffered.length; i++) {\n const buf2len = buffered2.length;\n if (buf2len) {\n const buf2end = buffered2[buf2len - 1].end;\n // if small hole (value between 0 or maxHoleDuration ) or overlapping (negative)\n if (buffered[i].start - buf2end < maxHoleDuration) {\n // merge overlapping time ranges\n // update lastRange.end only if smaller than item.end\n // e.g. [ 1, 15] with [ 2,8] => [ 1,15] (no need to modify lastRange.end)\n // whereas [ 1, 8] with [ 2,15] => [ 1,15] ( lastRange should switch from [1,8] to [1,15])\n if (buffered[i].end > buf2end) {\n buffered2[buf2len - 1].end = buffered[i].end;\n }\n } else {\n // big hole\n buffered2.push(buffered[i]);\n }\n } else {\n // first value\n buffered2.push(buffered[i]);\n }\n }\n } else {\n buffered2 = buffered;\n }\n let bufferLen = 0;\n\n // bufferStartNext can possibly be undefined based on the conditional logic below\n let bufferStartNext;\n\n // bufferStart and bufferEnd are buffer boundaries around current video position\n let bufferStart = pos;\n let bufferEnd = pos;\n for (let i = 0; i < buffered2.length; i++) {\n const start = buffered2[i].start;\n const end = buffered2[i].end;\n // logger.log('buf start/end:' + buffered.start(i) + '/' + buffered.end(i));\n if (pos + maxHoleDuration >= start && pos < end) {\n // play position is inside this buffer TimeRange, retrieve end of buffer position and buffer length\n bufferStart = start;\n bufferEnd = end;\n bufferLen = bufferEnd - pos;\n } else if (pos + maxHoleDuration < start) {\n bufferStartNext = start;\n break;\n }\n }\n return {\n len: bufferLen,\n start: bufferStart || 0,\n end: bufferEnd || 0,\n nextStart: bufferStartNext\n };\n }\n\n /**\n * Safe method to get buffered property.\n * SourceBuffer.buffered may throw if SourceBuffer is removed from it's MediaSource\n */\n static getBuffered(media) {\n try {\n return media.buffered;\n } catch (e) {\n logger.log('failed to get media.buffered', e);\n return noopBuffered;\n }\n }\n}\n\nclass ChunkMetadata {\n constructor(level, sn, id, size = 0, part = -1, partial = false) {\n this.level = void 0;\n this.sn = void 0;\n this.part = void 0;\n this.id = void 0;\n this.size = void 0;\n this.partial = void 0;\n this.transmuxing = getNewPerformanceTiming();\n this.buffering = {\n audio: getNewPerformanceTiming(),\n video: getNewPerformanceTiming(),\n audiovideo: getNewPerformanceTiming()\n };\n this.level = level;\n this.sn = sn;\n this.id = id;\n this.size = size;\n this.part = part;\n this.partial = partial;\n }\n}\nfunction getNewPerformanceTiming() {\n return {\n start: 0,\n executeStart: 0,\n executeEnd: 0,\n end: 0\n };\n}\n\nfunction findFirstFragWithCC(fragments, cc) {\n for (let i = 0, len = fragments.length; i < len; i++) {\n var _fragments$i;\n if (((_fragments$i = fragments[i]) == null ? void 0 : _fragments$i.cc) === cc) {\n return fragments[i];\n }\n }\n return null;\n}\nfunction shouldAlignOnDiscontinuities(lastFrag, switchDetails, details) {\n if (switchDetails) {\n if (details.endCC > details.startCC || lastFrag && lastFrag.cc < details.startCC) {\n return true;\n }\n }\n return false;\n}\n\n// Find the first frag in the previous level which matches the CC of the first frag of the new level\nfunction findDiscontinuousReferenceFrag(prevDetails, curDetails) {\n const prevFrags = prevDetails.fragments;\n const curFrags = curDetails.fragments;\n if (!curFrags.length || !prevFrags.length) {\n logger.log('No fragments to align');\n return;\n }\n const prevStartFrag = findFirstFragWithCC(prevFrags, curFrags[0].cc);\n if (!prevStartFrag || prevStartFrag && !prevStartFrag.startPTS) {\n logger.log('No frag in previous level to align on');\n return;\n }\n return prevStartFrag;\n}\nfunction adjustFragmentStart(frag, sliding) {\n if (frag) {\n const start = frag.start + sliding;\n frag.start = frag.startPTS = start;\n frag.endPTS = start + frag.duration;\n }\n}\nfunction adjustSlidingStart(sliding, details) {\n // Update segments\n const fragments = details.fragments;\n for (let i = 0, len = fragments.length; i < len; i++) {\n adjustFragmentStart(fragments[i], sliding);\n }\n // Update LL-HLS parts at the end of the playlist\n if (details.fragmentHint) {\n adjustFragmentStart(details.fragmentHint, sliding);\n }\n details.alignedSliding = true;\n}\n\n/**\n * Using the parameters of the last level, this function computes PTS' of the new fragments so that they form a\n * contiguous stream with the last fragments.\n * The PTS of a fragment lets Hls.js know where it fits into a stream - by knowing every PTS, we know which fragment to\n * download at any given time. PTS is normally computed when the fragment is demuxed, so taking this step saves us time\n * and an extra download.\n * @param lastFrag\n * @param lastLevel\n * @param details\n */\nfunction alignStream(lastFrag, switchDetails, details) {\n if (!switchDetails) {\n return;\n }\n alignDiscontinuities(lastFrag, details, switchDetails);\n if (!details.alignedSliding && switchDetails) {\n // If the PTS wasn't figured out via discontinuity sequence that means there was no CC increase within the level.\n // Aligning via Program Date Time should therefore be reliable, since PDT should be the same within the same\n // discontinuity sequence.\n alignMediaPlaylistByPDT(details, switchDetails);\n }\n if (!details.alignedSliding && switchDetails && !details.skippedSegments) {\n // Try to align on sn so that we pick a better start fragment.\n // Do not perform this on playlists with delta updates as this is only to align levels on switch\n // and adjustSliding only adjusts fragments after skippedSegments.\n adjustSliding(switchDetails, details);\n }\n}\n\n/**\n * Computes the PTS if a new level's fragments using the PTS of a fragment in the last level which shares the same\n * discontinuity sequence.\n * @param lastFrag - The last Fragment which shares the same discontinuity sequence\n * @param lastLevel - The details of the last loaded level\n * @param details - The details of the new level\n */\nfunction alignDiscontinuities(lastFrag, details, switchDetails) {\n if (shouldAlignOnDiscontinuities(lastFrag, switchDetails, details)) {\n const referenceFrag = findDiscontinuousReferenceFrag(switchDetails, details);\n if (referenceFrag && isFiniteNumber(referenceFrag.start)) {\n logger.log(`Adjusting PTS using last level due to CC increase within current level ${details.url}`);\n adjustSlidingStart(referenceFrag.start, details);\n }\n }\n}\n\n/**\n * Ensures appropriate time-alignment between renditions based on PDT.\n * This function assumes the timelines represented in `refDetails` are accurate, including the PDTs\n * for the last discontinuity sequence number shared by both playlists when present,\n * and uses the \"wallclock\"/PDT timeline as a cross-reference to `details`, adjusting the presentation\n * times/timelines of `details` accordingly.\n * Given the asynchronous nature of fetches and initial loads of live `main` and audio/subtitle tracks,\n * the primary purpose of this function is to ensure the \"local timelines\" of audio/subtitle tracks\n * are aligned to the main/video timeline, using PDT as the cross-reference/\"anchor\" that should\n * be consistent across playlists, per the HLS spec.\n * @param details - The details of the rendition you'd like to time-align (e.g. an audio rendition).\n * @param refDetails - The details of the reference rendition with start and PDT times for alignment.\n */\nfunction alignMediaPlaylistByPDT(details, refDetails) {\n if (!details.hasProgramDateTime || !refDetails.hasProgramDateTime) {\n return;\n }\n const fragments = details.fragments;\n const refFragments = refDetails.fragments;\n if (!fragments.length || !refFragments.length) {\n return;\n }\n\n // Calculate a delta to apply to all fragments according to the delta in PDT times and start times\n // of a fragment in the reference details, and a fragment in the target details of the same discontinuity.\n // If a fragment of the same discontinuity was not found use the middle fragment of both.\n let refFrag;\n let frag;\n const targetCC = Math.min(refDetails.endCC, details.endCC);\n if (refDetails.startCC < targetCC && details.startCC < targetCC) {\n refFrag = findFirstFragWithCC(refFragments, targetCC);\n frag = findFirstFragWithCC(fragments, targetCC);\n }\n if (!refFrag || !frag) {\n refFrag = refFragments[Math.floor(refFragments.length / 2)];\n frag = findFirstFragWithCC(fragments, refFrag.cc) || fragments[Math.floor(fragments.length / 2)];\n }\n const refPDT = refFrag.programDateTime;\n const targetPDT = frag.programDateTime;\n if (!refPDT || !targetPDT) {\n return;\n }\n const delta = (targetPDT - refPDT) / 1000 - (frag.start - refFrag.start);\n adjustSlidingStart(delta, details);\n}\n\nconst MIN_CHUNK_SIZE = Math.pow(2, 17); // 128kb\n\nclass FragmentLoader {\n constructor(config) {\n this.config = void 0;\n this.loader = null;\n this.partLoadTimeout = -1;\n this.config = config;\n }\n destroy() {\n if (this.loader) {\n this.loader.destroy();\n this.loader = null;\n }\n }\n abort() {\n if (this.loader) {\n // Abort the loader for current fragment. Only one may load at any given time\n this.loader.abort();\n }\n }\n load(frag, onProgress) {\n const url = frag.url;\n if (!url) {\n return Promise.reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.FRAG_LOAD_ERROR,\n fatal: false,\n frag,\n error: new Error(`Fragment does not have a ${url ? 'part list' : 'url'}`),\n networkDetails: null\n }));\n }\n this.abort();\n const config = this.config;\n const FragmentILoader = config.fLoader;\n const DefaultILoader = config.loader;\n return new Promise((resolve, reject) => {\n if (this.loader) {\n this.loader.destroy();\n }\n if (frag.gap) {\n if (frag.tagList.some(tags => tags[0] === 'GAP')) {\n reject(createGapLoadError(frag));\n return;\n } else {\n // Reset temporary treatment as GAP tag\n frag.gap = false;\n }\n }\n const loader = this.loader = frag.loader = FragmentILoader ? new FragmentILoader(config) : new DefaultILoader(config);\n const loaderContext = createLoaderContext(frag);\n const loadPolicy = getLoaderConfigWithoutReties(config.fragLoadPolicy.default);\n const loaderConfig = {\n loadPolicy,\n timeout: loadPolicy.maxLoadTimeMs,\n maxRetry: 0,\n retryDelay: 0,\n maxRetryDelay: 0,\n highWaterMark: frag.sn === 'initSegment' ? Infinity : MIN_CHUNK_SIZE\n };\n // Assign frag stats to the loader's stats reference\n frag.stats = loader.stats;\n loader.load(loaderContext, loaderConfig, {\n onSuccess: (response, stats, context, networkDetails) => {\n this.resetLoader(frag, loader);\n let payload = response.data;\n if (context.resetIV && frag.decryptdata) {\n frag.decryptdata.iv = new Uint8Array(payload.slice(0, 16));\n payload = payload.slice(16);\n }\n resolve({\n frag,\n part: null,\n payload,\n networkDetails\n });\n },\n onError: (response, context, networkDetails, stats) => {\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.FRAG_LOAD_ERROR,\n fatal: false,\n frag,\n response: _objectSpread2({\n url,\n data: undefined\n }, response),\n error: new Error(`HTTP Error ${response.code} ${response.text}`),\n networkDetails,\n stats\n }));\n },\n onAbort: (stats, context, networkDetails) => {\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.INTERNAL_ABORTED,\n fatal: false,\n frag,\n error: new Error('Aborted'),\n networkDetails,\n stats\n }));\n },\n onTimeout: (stats, context, networkDetails) => {\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.FRAG_LOAD_TIMEOUT,\n fatal: false,\n frag,\n error: new Error(`Timeout after ${loaderConfig.timeout}ms`),\n networkDetails,\n stats\n }));\n },\n onProgress: (stats, context, data, networkDetails) => {\n if (onProgress) {\n onProgress({\n frag,\n part: null,\n payload: data,\n networkDetails\n });\n }\n }\n });\n });\n }\n loadPart(frag, part, onProgress) {\n this.abort();\n const config = this.config;\n const FragmentILoader = config.fLoader;\n const DefaultILoader = config.loader;\n return new Promise((resolve, reject) => {\n if (this.loader) {\n this.loader.destroy();\n }\n if (frag.gap || part.gap) {\n reject(createGapLoadError(frag, part));\n return;\n }\n const loader = this.loader = frag.loader = FragmentILoader ? new FragmentILoader(config) : new DefaultILoader(config);\n const loaderContext = createLoaderContext(frag, part);\n // Should we define another load policy for parts?\n const loadPolicy = getLoaderConfigWithoutReties(config.fragLoadPolicy.default);\n const loaderConfig = {\n loadPolicy,\n timeout: loadPolicy.maxLoadTimeMs,\n maxRetry: 0,\n retryDelay: 0,\n maxRetryDelay: 0,\n highWaterMark: MIN_CHUNK_SIZE\n };\n // Assign part stats to the loader's stats reference\n part.stats = loader.stats;\n loader.load(loaderContext, loaderConfig, {\n onSuccess: (response, stats, context, networkDetails) => {\n this.resetLoader(frag, loader);\n this.updateStatsFromPart(frag, part);\n const partLoadedData = {\n frag,\n part,\n payload: response.data,\n networkDetails\n };\n onProgress(partLoadedData);\n resolve(partLoadedData);\n },\n onError: (response, context, networkDetails, stats) => {\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.FRAG_LOAD_ERROR,\n fatal: false,\n frag,\n part,\n response: _objectSpread2({\n url: loaderContext.url,\n data: undefined\n }, response),\n error: new Error(`HTTP Error ${response.code} ${response.text}`),\n networkDetails,\n stats\n }));\n },\n onAbort: (stats, context, networkDetails) => {\n frag.stats.aborted = part.stats.aborted;\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.INTERNAL_ABORTED,\n fatal: false,\n frag,\n part,\n error: new Error('Aborted'),\n networkDetails,\n stats\n }));\n },\n onTimeout: (stats, context, networkDetails) => {\n this.resetLoader(frag, loader);\n reject(new LoadError({\n type: ErrorTypes.NETWORK_ERROR,\n details: ErrorDetails.FRAG_LOAD_TIMEOUT,\n fatal: false,\n frag,\n part,\n error: new Error(`Timeout after ${loaderConfig.timeout}ms`),\n networkDetails,\n stats\n }));\n }\n });\n });\n }\n updateStatsFromPart(frag, part) {\n const fragStats = frag.stats;\n const partStats = part.stats;\n const partTotal = partStats.total;\n fragStats.loaded += partStats.loaded;\n if (partTotal) {\n const estTotalParts = Math.round(frag.duration / part.duration);\n const estLoadedParts = Math.min(Math.round(fragStats.loaded / partTotal), estTotalParts);\n const estRemainingParts = estTotalParts - estLoadedParts;\n const estRemainingBytes = estRemainingParts * Math.round(fragStats.loaded / estLoadedParts);\n fragStats.total = fragStats.loaded + estRemainingBytes;\n } else {\n fragStats.total = Math.max(fragStats.loaded, fragStats.total);\n }\n const fragLoading = fragStats.loading;\n const partLoading = partStats.loading;\n if (fragLoading.start) {\n // add to fragment loader latency\n fragLoading.first += partLoading.first - partLoading.start;\n } else {\n fragLoading.start = partLoading.start;\n fragLoading.first = partLoading.first;\n }\n fragLoading.end = partLoading.end;\n }\n resetLoader(frag, loader) {\n frag.loader = null;\n if (this.loader === loader) {\n self.clearTimeout(this.partLoadTimeout);\n this.loader = null;\n }\n loader.destroy();\n }\n}\nfunction createLoaderContext(frag, part = null) {\n const segment = part || frag;\n const loaderContext = {\n frag,\n part,\n responseType: 'arraybuffer',\n url: segment.url,\n headers: {},\n rangeStart: 0,\n rangeEnd: 0\n };\n const start = segment.byteRangeStartOffset;\n const end = segment.byteRangeEndOffset;\n if (isFiniteNumber(start) && isFiniteNumber(end)) {\n var _frag$decryptdata;\n let byteRangeStart = start;\n let byteRangeEnd = end;\n if (frag.sn === 'initSegment' && ((_frag$decryptdata = frag.decryptdata) == null ? void 0 : _frag$decryptdata.method) === 'AES-128') {\n // MAP segment encrypted with method 'AES-128', when served with HTTP Range,\n // has the unencrypted size specified in the range.\n // Ref: https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-08#section-6.3.6\n const fragmentLen = end - start;\n if (fragmentLen % 16) {\n byteRangeEnd = end + (16 - fragmentLen % 16);\n }\n if (start !== 0) {\n loaderContext.resetIV = true;\n byteRangeStart = start - 16;\n }\n }\n loaderContext.rangeStart = byteRangeStart;\n loaderContext.rangeEnd = byteRangeEnd;\n }\n return loaderContext;\n}\nfunction createGapLoadError(frag, part) {\n const error = new Error(`GAP ${frag.gap ? 'tag' : 'attribute'} found`);\n const errorData = {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_GAP,\n fatal: false,\n frag,\n error,\n networkDetails: null\n };\n if (part) {\n errorData.part = part;\n }\n (part ? part : frag).stats.aborted = true;\n return new LoadError(errorData);\n}\nclass LoadError extends Error {\n constructor(data) {\n super(data.error.message);\n this.data = void 0;\n this.data = data;\n }\n}\n\nclass AESCrypto {\n constructor(subtle, iv) {\n this.subtle = void 0;\n this.aesIV = void 0;\n this.subtle = subtle;\n this.aesIV = iv;\n }\n decrypt(data, key) {\n return this.subtle.decrypt({\n name: 'AES-CBC',\n iv: this.aesIV\n }, key, data);\n }\n}\n\nclass FastAESKey {\n constructor(subtle, key) {\n this.subtle = void 0;\n this.key = void 0;\n this.subtle = subtle;\n this.key = key;\n }\n expandKey() {\n return this.subtle.importKey('raw', this.key, {\n name: 'AES-CBC'\n }, false, ['encrypt', 'decrypt']);\n }\n}\n\n// PKCS7\nfunction removePadding(array) {\n const outputBytes = array.byteLength;\n const paddingBytes = outputBytes && new DataView(array.buffer).getUint8(outputBytes - 1);\n if (paddingBytes) {\n return sliceUint8(array, 0, outputBytes - paddingBytes);\n }\n return array;\n}\nclass AESDecryptor {\n constructor() {\n this.rcon = [0x0, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36];\n this.subMix = [new Uint32Array(256), new Uint32Array(256), new Uint32Array(256), new Uint32Array(256)];\n this.invSubMix = [new Uint32Array(256), new Uint32Array(256), new Uint32Array(256), new Uint32Array(256)];\n this.sBox = new Uint32Array(256);\n this.invSBox = new Uint32Array(256);\n this.key = new Uint32Array(0);\n this.ksRows = 0;\n this.keySize = 0;\n this.keySchedule = void 0;\n this.invKeySchedule = void 0;\n this.initTable();\n }\n\n // Using view.getUint32() also swaps the byte order.\n uint8ArrayToUint32Array_(arrayBuffer) {\n const view = new DataView(arrayBuffer);\n const newArray = new Uint32Array(4);\n for (let i = 0; i < 4; i++) {\n newArray[i] = view.getUint32(i * 4);\n }\n return newArray;\n }\n initTable() {\n const sBox = this.sBox;\n const invSBox = this.invSBox;\n const subMix = this.subMix;\n const subMix0 = subMix[0];\n const subMix1 = subMix[1];\n const subMix2 = subMix[2];\n const subMix3 = subMix[3];\n const invSubMix = this.invSubMix;\n const invSubMix0 = invSubMix[0];\n const invSubMix1 = invSubMix[1];\n const invSubMix2 = invSubMix[2];\n const invSubMix3 = invSubMix[3];\n const d = new Uint32Array(256);\n let x = 0;\n let xi = 0;\n let i = 0;\n for (i = 0; i < 256; i++) {\n if (i < 128) {\n d[i] = i << 1;\n } else {\n d[i] = i << 1 ^ 0x11b;\n }\n }\n for (i = 0; i < 256; i++) {\n let sx = xi ^ xi << 1 ^ xi << 2 ^ xi << 3 ^ xi << 4;\n sx = sx >>> 8 ^ sx & 0xff ^ 0x63;\n sBox[x] = sx;\n invSBox[sx] = x;\n\n // Compute multiplication\n const x2 = d[x];\n const x4 = d[x2];\n const x8 = d[x4];\n\n // Compute sub/invSub bytes, mix columns tables\n let t = d[sx] * 0x101 ^ sx * 0x1010100;\n subMix0[x] = t << 24 | t >>> 8;\n subMix1[x] = t << 16 | t >>> 16;\n subMix2[x] = t << 8 | t >>> 24;\n subMix3[x] = t;\n\n // Compute inv sub bytes, inv mix columns tables\n t = x8 * 0x1010101 ^ x4 * 0x10001 ^ x2 * 0x101 ^ x * 0x1010100;\n invSubMix0[sx] = t << 24 | t >>> 8;\n invSubMix1[sx] = t << 16 | t >>> 16;\n invSubMix2[sx] = t << 8 | t >>> 24;\n invSubMix3[sx] = t;\n\n // Compute next counter\n if (!x) {\n x = xi = 1;\n } else {\n x = x2 ^ d[d[d[x8 ^ x2]]];\n xi ^= d[d[xi]];\n }\n }\n }\n expandKey(keyBuffer) {\n // convert keyBuffer to Uint32Array\n const key = this.uint8ArrayToUint32Array_(keyBuffer);\n let sameKey = true;\n let offset = 0;\n while (offset < key.length && sameKey) {\n sameKey = key[offset] === this.key[offset];\n offset++;\n }\n if (sameKey) {\n return;\n }\n this.key = key;\n const keySize = this.keySize = key.length;\n if (keySize !== 4 && keySize !== 6 && keySize !== 8) {\n throw new Error('Invalid aes key size=' + keySize);\n }\n const ksRows = this.ksRows = (keySize + 6 + 1) * 4;\n let ksRow;\n let invKsRow;\n const keySchedule = this.keySchedule = new Uint32Array(ksRows);\n const invKeySchedule = this.invKeySchedule = new Uint32Array(ksRows);\n const sbox = this.sBox;\n const rcon = this.rcon;\n const invSubMix = this.invSubMix;\n const invSubMix0 = invSubMix[0];\n const invSubMix1 = invSubMix[1];\n const invSubMix2 = invSubMix[2];\n const invSubMix3 = invSubMix[3];\n let prev;\n let t;\n for (ksRow = 0; ksRow < ksRows; ksRow++) {\n if (ksRow < keySize) {\n prev = keySchedule[ksRow] = key[ksRow];\n continue;\n }\n t = prev;\n if (ksRow % keySize === 0) {\n // Rot word\n t = t << 8 | t >>> 24;\n\n // Sub word\n t = sbox[t >>> 24] << 24 | sbox[t >>> 16 & 0xff] << 16 | sbox[t >>> 8 & 0xff] << 8 | sbox[t & 0xff];\n\n // Mix Rcon\n t ^= rcon[ksRow / keySize | 0] << 24;\n } else if (keySize > 6 && ksRow % keySize === 4) {\n // Sub word\n t = sbox[t >>> 24] << 24 | sbox[t >>> 16 & 0xff] << 16 | sbox[t >>> 8 & 0xff] << 8 | sbox[t & 0xff];\n }\n keySchedule[ksRow] = prev = (keySchedule[ksRow - keySize] ^ t) >>> 0;\n }\n for (invKsRow = 0; invKsRow < ksRows; invKsRow++) {\n ksRow = ksRows - invKsRow;\n if (invKsRow & 3) {\n t = keySchedule[ksRow];\n } else {\n t = keySchedule[ksRow - 4];\n }\n if (invKsRow < 4 || ksRow <= 4) {\n invKeySchedule[invKsRow] = t;\n } else {\n invKeySchedule[invKsRow] = invSubMix0[sbox[t >>> 24]] ^ invSubMix1[sbox[t >>> 16 & 0xff]] ^ invSubMix2[sbox[t >>> 8 & 0xff]] ^ invSubMix3[sbox[t & 0xff]];\n }\n invKeySchedule[invKsRow] = invKeySchedule[invKsRow] >>> 0;\n }\n }\n\n // Adding this as a method greatly improves performance.\n networkToHostOrderSwap(word) {\n return word << 24 | (word & 0xff00) << 8 | (word & 0xff0000) >> 8 | word >>> 24;\n }\n decrypt(inputArrayBuffer, offset, aesIV) {\n const nRounds = this.keySize + 6;\n const invKeySchedule = this.invKeySchedule;\n const invSBOX = this.invSBox;\n const invSubMix = this.invSubMix;\n const invSubMix0 = invSubMix[0];\n const invSubMix1 = invSubMix[1];\n const invSubMix2 = invSubMix[2];\n const invSubMix3 = invSubMix[3];\n const initVector = this.uint8ArrayToUint32Array_(aesIV);\n let initVector0 = initVector[0];\n let initVector1 = initVector[1];\n let initVector2 = initVector[2];\n let initVector3 = initVector[3];\n const inputInt32 = new Int32Array(inputArrayBuffer);\n const outputInt32 = new Int32Array(inputInt32.length);\n let t0, t1, t2, t3;\n let s0, s1, s2, s3;\n let inputWords0, inputWords1, inputWords2, inputWords3;\n let ksRow, i;\n const swapWord = this.networkToHostOrderSwap;\n while (offset < inputInt32.length) {\n inputWords0 = swapWord(inputInt32[offset]);\n inputWords1 = swapWord(inputInt32[offset + 1]);\n inputWords2 = swapWord(inputInt32[offset + 2]);\n inputWords3 = swapWord(inputInt32[offset + 3]);\n s0 = inputWords0 ^ invKeySchedule[0];\n s1 = inputWords3 ^ invKeySchedule[1];\n s2 = inputWords2 ^ invKeySchedule[2];\n s3 = inputWords1 ^ invKeySchedule[3];\n ksRow = 4;\n\n // Iterate through the rounds of decryption\n for (i = 1; i < nRounds; i++) {\n t0 = invSubMix0[s0 >>> 24] ^ invSubMix1[s1 >> 16 & 0xff] ^ invSubMix2[s2 >> 8 & 0xff] ^ invSubMix3[s3 & 0xff] ^ invKeySchedule[ksRow];\n t1 = invSubMix0[s1 >>> 24] ^ invSubMix1[s2 >> 16 & 0xff] ^ invSubMix2[s3 >> 8 & 0xff] ^ invSubMix3[s0 & 0xff] ^ invKeySchedule[ksRow + 1];\n t2 = invSubMix0[s2 >>> 24] ^ invSubMix1[s3 >> 16 & 0xff] ^ invSubMix2[s0 >> 8 & 0xff] ^ invSubMix3[s1 & 0xff] ^ invKeySchedule[ksRow + 2];\n t3 = invSubMix0[s3 >>> 24] ^ invSubMix1[s0 >> 16 & 0xff] ^ invSubMix2[s1 >> 8 & 0xff] ^ invSubMix3[s2 & 0xff] ^ invKeySchedule[ksRow + 3];\n // Update state\n s0 = t0;\n s1 = t1;\n s2 = t2;\n s3 = t3;\n ksRow = ksRow + 4;\n }\n\n // Shift rows, sub bytes, add round key\n t0 = invSBOX[s0 >>> 24] << 24 ^ invSBOX[s1 >> 16 & 0xff] << 16 ^ invSBOX[s2 >> 8 & 0xff] << 8 ^ invSBOX[s3 & 0xff] ^ invKeySchedule[ksRow];\n t1 = invSBOX[s1 >>> 24] << 24 ^ invSBOX[s2 >> 16 & 0xff] << 16 ^ invSBOX[s3 >> 8 & 0xff] << 8 ^ invSBOX[s0 & 0xff] ^ invKeySchedule[ksRow + 1];\n t2 = invSBOX[s2 >>> 24] << 24 ^ invSBOX[s3 >> 16 & 0xff] << 16 ^ invSBOX[s0 >> 8 & 0xff] << 8 ^ invSBOX[s1 & 0xff] ^ invKeySchedule[ksRow + 2];\n t3 = invSBOX[s3 >>> 24] << 24 ^ invSBOX[s0 >> 16 & 0xff] << 16 ^ invSBOX[s1 >> 8 & 0xff] << 8 ^ invSBOX[s2 & 0xff] ^ invKeySchedule[ksRow + 3];\n\n // Write\n outputInt32[offset] = swapWord(t0 ^ initVector0);\n outputInt32[offset + 1] = swapWord(t3 ^ initVector1);\n outputInt32[offset + 2] = swapWord(t2 ^ initVector2);\n outputInt32[offset + 3] = swapWord(t1 ^ initVector3);\n\n // reset initVector to last 4 unsigned int\n initVector0 = inputWords0;\n initVector1 = inputWords1;\n initVector2 = inputWords2;\n initVector3 = inputWords3;\n offset = offset + 4;\n }\n return outputInt32.buffer;\n }\n}\n\nconst CHUNK_SIZE = 16; // 16 bytes, 128 bits\n\nclass Decrypter {\n constructor(config, {\n removePKCS7Padding = true\n } = {}) {\n this.logEnabled = true;\n this.removePKCS7Padding = void 0;\n this.subtle = null;\n this.softwareDecrypter = null;\n this.key = null;\n this.fastAesKey = null;\n this.remainderData = null;\n this.currentIV = null;\n this.currentResult = null;\n this.useSoftware = void 0;\n this.useSoftware = config.enableSoftwareAES;\n this.removePKCS7Padding = removePKCS7Padding;\n // built in decryptor expects PKCS7 padding\n if (removePKCS7Padding) {\n try {\n const browserCrypto = self.crypto;\n if (browserCrypto) {\n this.subtle = browserCrypto.subtle || browserCrypto.webkitSubtle;\n }\n } catch (e) {\n /* no-op */\n }\n }\n this.useSoftware = !this.subtle;\n }\n destroy() {\n this.subtle = null;\n this.softwareDecrypter = null;\n this.key = null;\n this.fastAesKey = null;\n this.remainderData = null;\n this.currentIV = null;\n this.currentResult = null;\n }\n isSync() {\n return this.useSoftware;\n }\n flush() {\n const {\n currentResult,\n remainderData\n } = this;\n if (!currentResult || remainderData) {\n this.reset();\n return null;\n }\n const data = new Uint8Array(currentResult);\n this.reset();\n if (this.removePKCS7Padding) {\n return removePadding(data);\n }\n return data;\n }\n reset() {\n this.currentResult = null;\n this.currentIV = null;\n this.remainderData = null;\n if (this.softwareDecrypter) {\n this.softwareDecrypter = null;\n }\n }\n decrypt(data, key, iv) {\n if (this.useSoftware) {\n return new Promise((resolve, reject) => {\n this.softwareDecrypt(new Uint8Array(data), key, iv);\n const decryptResult = this.flush();\n if (decryptResult) {\n resolve(decryptResult.buffer);\n } else {\n reject(new Error('[softwareDecrypt] Failed to decrypt data'));\n }\n });\n }\n return this.webCryptoDecrypt(new Uint8Array(data), key, iv);\n }\n\n // Software decryption is progressive. Progressive decryption may not return a result on each call. Any cached\n // data is handled in the flush() call\n softwareDecrypt(data, key, iv) {\n const {\n currentIV,\n currentResult,\n remainderData\n } = this;\n this.logOnce('JS AES decrypt');\n // The output is staggered during progressive parsing - the current result is cached, and emitted on the next call\n // This is done in order to strip PKCS7 padding, which is found at the end of each segment. We only know we've reached\n // the end on flush(), but by that time we have already received all bytes for the segment.\n // Progressive decryption does not work with WebCrypto\n\n if (remainderData) {\n data = appendUint8Array(remainderData, data);\n this.remainderData = null;\n }\n\n // Byte length must be a multiple of 16 (AES-128 = 128 bit blocks = 16 bytes)\n const currentChunk = this.getValidChunk(data);\n if (!currentChunk.length) {\n return null;\n }\n if (currentIV) {\n iv = currentIV;\n }\n let softwareDecrypter = this.softwareDecrypter;\n if (!softwareDecrypter) {\n softwareDecrypter = this.softwareDecrypter = new AESDecryptor();\n }\n softwareDecrypter.expandKey(key);\n const result = currentResult;\n this.currentResult = softwareDecrypter.decrypt(currentChunk.buffer, 0, iv);\n this.currentIV = sliceUint8(currentChunk, -16).buffer;\n if (!result) {\n return null;\n }\n return result;\n }\n webCryptoDecrypt(data, key, iv) {\n if (this.key !== key || !this.fastAesKey) {\n if (!this.subtle) {\n return Promise.resolve(this.onWebCryptoError(data, key, iv));\n }\n this.key = key;\n this.fastAesKey = new FastAESKey(this.subtle, key);\n }\n return this.fastAesKey.expandKey().then(aesKey => {\n // decrypt using web crypto\n if (!this.subtle) {\n return Promise.reject(new Error('web crypto not initialized'));\n }\n this.logOnce('WebCrypto AES decrypt');\n const crypto = new AESCrypto(this.subtle, new Uint8Array(iv));\n return crypto.decrypt(data.buffer, aesKey);\n }).catch(err => {\n logger.warn(`[decrypter]: WebCrypto Error, disable WebCrypto API, ${err.name}: ${err.message}`);\n return this.onWebCryptoError(data, key, iv);\n });\n }\n onWebCryptoError(data, key, iv) {\n this.useSoftware = true;\n this.logEnabled = true;\n this.softwareDecrypt(data, key, iv);\n const decryptResult = this.flush();\n if (decryptResult) {\n return decryptResult.buffer;\n }\n throw new Error('WebCrypto and softwareDecrypt: failed to decrypt data');\n }\n getValidChunk(data) {\n let currentChunk = data;\n const splitPoint = data.length - data.length % CHUNK_SIZE;\n if (splitPoint !== data.length) {\n currentChunk = sliceUint8(data, 0, splitPoint);\n this.remainderData = sliceUint8(data, splitPoint);\n }\n return currentChunk;\n }\n logOnce(msg) {\n if (!this.logEnabled) {\n return;\n }\n logger.log(`[decrypter]: ${msg}`);\n this.logEnabled = false;\n }\n}\n\n/**\n * TimeRanges to string helper\n */\n\nconst TimeRanges = {\n toString: function (r) {\n let log = '';\n const len = r.length;\n for (let i = 0; i < len; i++) {\n log += `[${r.start(i).toFixed(3)}-${r.end(i).toFixed(3)}]`;\n }\n return log;\n }\n};\n\nconst State = {\n STOPPED: 'STOPPED',\n IDLE: 'IDLE',\n KEY_LOADING: 'KEY_LOADING',\n FRAG_LOADING: 'FRAG_LOADING',\n FRAG_LOADING_WAITING_RETRY: 'FRAG_LOADING_WAITING_RETRY',\n WAITING_TRACK: 'WAITING_TRACK',\n PARSING: 'PARSING',\n PARSED: 'PARSED',\n ENDED: 'ENDED',\n ERROR: 'ERROR',\n WAITING_INIT_PTS: 'WAITING_INIT_PTS',\n WAITING_LEVEL: 'WAITING_LEVEL'\n};\nclass BaseStreamController extends TaskLoop {\n constructor(hls, fragmentTracker, keyLoader, logPrefix, playlistType) {\n super();\n this.hls = void 0;\n this.fragPrevious = null;\n this.fragCurrent = null;\n this.fragmentTracker = void 0;\n this.transmuxer = null;\n this._state = State.STOPPED;\n this.playlistType = void 0;\n this.media = null;\n this.mediaBuffer = null;\n this.config = void 0;\n this.bitrateTest = false;\n this.lastCurrentTime = 0;\n this.nextLoadPosition = 0;\n this.startPosition = 0;\n this.startTimeOffset = null;\n this.loadedmetadata = false;\n this.retryDate = 0;\n this.levels = null;\n this.fragmentLoader = void 0;\n this.keyLoader = void 0;\n this.levelLastLoaded = null;\n this.startFragRequested = false;\n this.decrypter = void 0;\n this.initPTS = [];\n this.onvseeking = null;\n this.onvended = null;\n this.logPrefix = '';\n this.log = void 0;\n this.warn = void 0;\n this.playlistType = playlistType;\n this.logPrefix = logPrefix;\n this.log = logger.log.bind(logger, `${logPrefix}:`);\n this.warn = logger.warn.bind(logger, `${logPrefix}:`);\n this.hls = hls;\n this.fragmentLoader = new FragmentLoader(hls.config);\n this.keyLoader = keyLoader;\n this.fragmentTracker = fragmentTracker;\n this.config = hls.config;\n this.decrypter = new Decrypter(hls.config);\n hls.on(Events.MANIFEST_LOADED, this.onManifestLoaded, this);\n }\n doTick() {\n this.onTickEnd();\n }\n onTickEnd() {}\n\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n startLoad(startPosition) {}\n stopLoad() {\n this.fragmentLoader.abort();\n this.keyLoader.abort(this.playlistType);\n const frag = this.fragCurrent;\n if (frag != null && frag.loader) {\n frag.abortRequests();\n this.fragmentTracker.removeFragment(frag);\n }\n this.resetTransmuxer();\n this.fragCurrent = null;\n this.fragPrevious = null;\n this.clearInterval();\n this.clearNextTick();\n this.state = State.STOPPED;\n }\n _streamEnded(bufferInfo, levelDetails) {\n // If playlist is live, there is another buffered range after the current range, nothing buffered, media is detached,\n // of nothing loading/loaded return false\n if (levelDetails.live || bufferInfo.nextStart || !bufferInfo.end || !this.media) {\n return false;\n }\n const partList = levelDetails.partList;\n // Since the last part isn't guaranteed to correspond to the last playlist segment for Low-Latency HLS,\n // check instead if the last part is buffered.\n if (partList != null && partList.length) {\n const lastPart = partList[partList.length - 1];\n\n // Checking the midpoint of the part for potential margin of error and related issues.\n // NOTE: Technically I believe parts could yield content that is < the computed duration (including potential a duration of 0)\n // and still be spec-compliant, so there may still be edge cases here. Likewise, there could be issues in end of stream\n // part mismatches for independent audio and video playlists/segments.\n const lastPartBuffered = BufferHelper.isBuffered(this.media, lastPart.start + lastPart.duration / 2);\n return lastPartBuffered;\n }\n const playlistType = levelDetails.fragments[levelDetails.fragments.length - 1].type;\n return this.fragmentTracker.isEndListAppended(playlistType);\n }\n getLevelDetails() {\n if (this.levels && this.levelLastLoaded !== null) {\n var _this$levelLastLoaded;\n return (_this$levelLastLoaded = this.levelLastLoaded) == null ? void 0 : _this$levelLastLoaded.details;\n }\n }\n onMediaAttached(event, data) {\n const media = this.media = this.mediaBuffer = data.media;\n this.onvseeking = this.onMediaSeeking.bind(this);\n this.onvended = this.onMediaEnded.bind(this);\n media.addEventListener('seeking', this.onvseeking);\n media.addEventListener('ended', this.onvended);\n const config = this.config;\n if (this.levels && config.autoStartLoad && this.state === State.STOPPED) {\n this.startLoad(config.startPosition);\n }\n }\n onMediaDetaching() {\n const media = this.media;\n if (media != null && media.ended) {\n this.log('MSE detaching and video ended, reset startPosition');\n this.startPosition = this.lastCurrentTime = 0;\n }\n\n // remove video listeners\n if (media && this.onvseeking && this.onvended) {\n media.removeEventListener('seeking', this.onvseeking);\n media.removeEventListener('ended', this.onvended);\n this.onvseeking = this.onvended = null;\n }\n if (this.keyLoader) {\n this.keyLoader.detach();\n }\n this.media = this.mediaBuffer = null;\n this.loadedmetadata = false;\n this.fragmentTracker.removeAllFragments();\n this.stopLoad();\n }\n onMediaSeeking() {\n const {\n config,\n fragCurrent,\n media,\n mediaBuffer,\n state\n } = this;\n const currentTime = media ? media.currentTime : 0;\n const bufferInfo = BufferHelper.bufferInfo(mediaBuffer ? mediaBuffer : media, currentTime, config.maxBufferHole);\n this.log(`media seeking to ${isFiniteNumber(currentTime) ? currentTime.toFixed(3) : currentTime}, state: ${state}`);\n if (this.state === State.ENDED) {\n this.resetLoadingState();\n } else if (fragCurrent) {\n // Seeking while frag load is in progress\n const tolerance = config.maxFragLookUpTolerance;\n const fragStartOffset = fragCurrent.start - tolerance;\n const fragEndOffset = fragCurrent.start + fragCurrent.duration + tolerance;\n // if seeking out of buffered range or into new one\n if (!bufferInfo.len || fragEndOffset < bufferInfo.start || fragStartOffset > bufferInfo.end) {\n const pastFragment = currentTime > fragEndOffset;\n // if the seek position is outside the current fragment range\n if (currentTime < fragStartOffset || pastFragment) {\n if (pastFragment && fragCurrent.loader) {\n this.log('seeking outside of buffer while fragment load in progress, cancel fragment load');\n fragCurrent.abortRequests();\n this.resetLoadingState();\n }\n this.fragPrevious = null;\n }\n }\n }\n if (media) {\n // Remove gap fragments\n this.fragmentTracker.removeFragmentsInRange(currentTime, Infinity, this.playlistType, true);\n this.lastCurrentTime = currentTime;\n }\n\n // in case seeking occurs although no media buffered, adjust startPosition and nextLoadPosition to seek target\n if (!this.loadedmetadata && !bufferInfo.len) {\n this.nextLoadPosition = this.startPosition = currentTime;\n }\n\n // Async tick to speed up processing\n this.tickImmediate();\n }\n onMediaEnded() {\n // reset startPosition and lastCurrentTime to restart playback @ stream beginning\n this.startPosition = this.lastCurrentTime = 0;\n }\n onManifestLoaded(event, data) {\n this.startTimeOffset = data.startTimeOffset;\n this.initPTS = [];\n }\n onHandlerDestroying() {\n this.hls.off(Events.MANIFEST_LOADED, this.onManifestLoaded, this);\n this.stopLoad();\n super.onHandlerDestroying();\n // @ts-ignore\n this.hls = null;\n }\n onHandlerDestroyed() {\n this.state = State.STOPPED;\n if (this.fragmentLoader) {\n this.fragmentLoader.destroy();\n }\n if (this.keyLoader) {\n this.keyLoader.destroy();\n }\n if (this.decrypter) {\n this.decrypter.destroy();\n }\n this.hls = this.log = this.warn = this.decrypter = this.keyLoader = this.fragmentLoader = this.fragmentTracker = null;\n super.onHandlerDestroyed();\n }\n loadFragment(frag, level, targetBufferTime) {\n this._loadFragForPlayback(frag, level, targetBufferTime);\n }\n _loadFragForPlayback(frag, level, targetBufferTime) {\n const progressCallback = data => {\n if (this.fragContextChanged(frag)) {\n this.warn(`Fragment ${frag.sn}${data.part ? ' p: ' + data.part.index : ''} of level ${frag.level} was dropped during download.`);\n this.fragmentTracker.removeFragment(frag);\n return;\n }\n frag.stats.chunkCount++;\n this._handleFragmentLoadProgress(data);\n };\n this._doFragLoad(frag, level, targetBufferTime, progressCallback).then(data => {\n if (!data) {\n // if we're here we probably needed to backtrack or are waiting for more parts\n return;\n }\n const state = this.state;\n if (this.fragContextChanged(frag)) {\n if (state === State.FRAG_LOADING || !this.fragCurrent && state === State.PARSING) {\n this.fragmentTracker.removeFragment(frag);\n this.state = State.IDLE;\n }\n return;\n }\n if ('payload' in data) {\n this.log(`Loaded fragment ${frag.sn} of level ${frag.level}`);\n this.hls.trigger(Events.FRAG_LOADED, data);\n }\n\n // Pass through the whole payload; controllers not implementing progressive loading receive data from this callback\n this._handleFragmentLoadComplete(data);\n }).catch(reason => {\n if (this.state === State.STOPPED || this.state === State.ERROR) {\n return;\n }\n this.warn(`Frag error: ${(reason == null ? void 0 : reason.message) || reason}`);\n this.resetFragmentLoading(frag);\n });\n }\n clearTrackerIfNeeded(frag) {\n var _this$mediaBuffer;\n const {\n fragmentTracker\n } = this;\n const fragState = fragmentTracker.getState(frag);\n if (fragState === FragmentState.APPENDING) {\n // Lower the max buffer length and try again\n const playlistType = frag.type;\n const bufferedInfo = this.getFwdBufferInfo(this.mediaBuffer, playlistType);\n const minForwardBufferLength = Math.max(frag.duration, bufferedInfo ? bufferedInfo.len : this.config.maxBufferLength);\n // If backtracking, always remove from the tracker without reducing max buffer length\n const backtrackFragment = this.backtrackFragment;\n const backtracked = backtrackFragment ? frag.sn - backtrackFragment.sn : 0;\n if (backtracked === 1 || this.reduceMaxBufferLength(minForwardBufferLength)) {\n fragmentTracker.removeFragment(frag);\n }\n } else if (((_this$mediaBuffer = this.mediaBuffer) == null ? void 0 : _this$mediaBuffer.buffered.length) === 0) {\n // Stop gap for bad tracker / buffer flush behavior\n fragmentTracker.removeAllFragments();\n } else if (fragmentTracker.hasParts(frag.type)) {\n // In low latency mode, remove fragments for which only some parts were buffered\n fragmentTracker.detectPartialFragments({\n frag,\n part: null,\n stats: frag.stats,\n id: frag.type\n });\n if (fragmentTracker.getState(frag) === FragmentState.PARTIAL) {\n fragmentTracker.removeFragment(frag);\n }\n }\n }\n checkLiveUpdate(details) {\n if (details.updated && !details.live) {\n // Live stream ended, update fragment tracker\n const lastFragment = details.fragments[details.fragments.length - 1];\n this.fragmentTracker.detectPartialFragments({\n frag: lastFragment,\n part: null,\n stats: lastFragment.stats,\n id: lastFragment.type\n });\n }\n if (!details.fragments[0]) {\n details.deltaUpdateFailed = true;\n }\n }\n flushMainBuffer(startOffset, endOffset, type = null) {\n if (!(startOffset - endOffset)) {\n return;\n }\n // When alternate audio is playing, the audio-stream-controller is responsible for the audio buffer. Otherwise,\n // passing a null type flushes both buffers\n const flushScope = {\n startOffset,\n endOffset,\n type\n };\n this.hls.trigger(Events.BUFFER_FLUSHING, flushScope);\n }\n _loadInitSegment(frag, level) {\n this._doFragLoad(frag, level).then(data => {\n if (!data || this.fragContextChanged(frag) || !this.levels) {\n throw new Error('init load aborted');\n }\n return data;\n }).then(data => {\n const {\n hls\n } = this;\n const {\n payload\n } = data;\n const decryptData = frag.decryptdata;\n\n // check to see if the payload needs to be decrypted\n if (payload && payload.byteLength > 0 && decryptData != null && decryptData.key && decryptData.iv && decryptData.method === 'AES-128') {\n const startTime = self.performance.now();\n // decrypt init segment data\n return this.decrypter.decrypt(new Uint8Array(payload), decryptData.key.buffer, decryptData.iv.buffer).catch(err => {\n hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_DECRYPT_ERROR,\n fatal: false,\n error: err,\n reason: err.message,\n frag\n });\n throw err;\n }).then(decryptedData => {\n const endTime = self.performance.now();\n hls.trigger(Events.FRAG_DECRYPTED, {\n frag,\n payload: decryptedData,\n stats: {\n tstart: startTime,\n tdecrypt: endTime\n }\n });\n data.payload = decryptedData;\n return this.completeInitSegmentLoad(data);\n });\n }\n return this.completeInitSegmentLoad(data);\n }).catch(reason => {\n if (this.state === State.STOPPED || this.state === State.ERROR) {\n return;\n }\n this.warn(reason);\n this.resetFragmentLoading(frag);\n });\n }\n completeInitSegmentLoad(data) {\n const {\n levels\n } = this;\n if (!levels) {\n throw new Error('init load aborted, missing levels');\n }\n const stats = data.frag.stats;\n this.state = State.IDLE;\n data.frag.data = new Uint8Array(data.payload);\n stats.parsing.start = stats.buffering.start = self.performance.now();\n stats.parsing.end = stats.buffering.end = self.performance.now();\n this.tick();\n }\n fragContextChanged(frag) {\n const {\n fragCurrent\n } = this;\n return !frag || !fragCurrent || frag.sn !== fragCurrent.sn || frag.level !== fragCurrent.level;\n }\n fragBufferedComplete(frag, part) {\n var _frag$startPTS, _frag$endPTS, _this$fragCurrent, _this$fragPrevious;\n const media = this.mediaBuffer ? this.mediaBuffer : this.media;\n this.log(`Buffered ${frag.type} sn: ${frag.sn}${part ? ' part: ' + part.index : ''} of ${this.playlistType === PlaylistLevelType.MAIN ? 'level' : 'track'} ${frag.level} (frag:[${((_frag$startPTS = frag.startPTS) != null ? _frag$startPTS : NaN).toFixed(3)}-${((_frag$endPTS = frag.endPTS) != null ? _frag$endPTS : NaN).toFixed(3)}] > buffer:${media ? TimeRanges.toString(BufferHelper.getBuffered(media)) : '(detached)'})`);\n if (frag.sn !== 'initSegment') {\n var _this$levels;\n if (frag.type !== PlaylistLevelType.SUBTITLE) {\n const el = frag.elementaryStreams;\n if (!Object.keys(el).some(type => !!el[type])) {\n // empty segment\n this.state = State.IDLE;\n return;\n }\n }\n const level = (_this$levels = this.levels) == null ? void 0 : _this$levels[frag.level];\n if (level != null && level.fragmentError) {\n this.log(`Resetting level fragment error count of ${level.fragmentError} on frag buffered`);\n level.fragmentError = 0;\n }\n }\n this.state = State.IDLE;\n if (!media) {\n return;\n }\n if (!this.loadedmetadata && frag.type == PlaylistLevelType.MAIN && media.buffered.length && ((_this$fragCurrent = this.fragCurrent) == null ? void 0 : _this$fragCurrent.sn) === ((_this$fragPrevious = this.fragPrevious) == null ? void 0 : _this$fragPrevious.sn)) {\n this.loadedmetadata = true;\n this.seekToStartPos();\n }\n this.tick();\n }\n seekToStartPos() {}\n _handleFragmentLoadComplete(fragLoadedEndData) {\n const {\n transmuxer\n } = this;\n if (!transmuxer) {\n return;\n }\n const {\n frag,\n part,\n partsLoaded\n } = fragLoadedEndData;\n // If we did not load parts, or loaded all parts, we have complete (not partial) fragment data\n const complete = !partsLoaded || partsLoaded.length === 0 || partsLoaded.some(fragLoaded => !fragLoaded);\n const chunkMeta = new ChunkMetadata(frag.level, frag.sn, frag.stats.chunkCount + 1, 0, part ? part.index : -1, !complete);\n transmuxer.flush(chunkMeta);\n }\n\n // eslint-disable-next-line @typescript-eslint/no-unused-vars\n _handleFragmentLoadProgress(frag) {}\n _doFragLoad(frag, level, targetBufferTime = null, progressCallback) {\n var _frag$decryptdata;\n const details = level == null ? void 0 : level.details;\n if (!this.levels || !details) {\n throw new Error(`frag load aborted, missing level${details ? '' : ' detail'}s`);\n }\n let keyLoadingPromise = null;\n if (frag.encrypted && !((_frag$decryptdata = frag.decryptdata) != null && _frag$decryptdata.key)) {\n this.log(`Loading key for ${frag.sn} of [${details.startSN}-${details.endSN}], ${this.logPrefix === '[stream-controller]' ? 'level' : 'track'} ${frag.level}`);\n this.state = State.KEY_LOADING;\n this.fragCurrent = frag;\n keyLoadingPromise = this.keyLoader.load(frag).then(keyLoadedData => {\n if (!this.fragContextChanged(keyLoadedData.frag)) {\n this.hls.trigger(Events.KEY_LOADED, keyLoadedData);\n if (this.state === State.KEY_LOADING) {\n this.state = State.IDLE;\n }\n return keyLoadedData;\n }\n });\n this.hls.trigger(Events.KEY_LOADING, {\n frag\n });\n if (this.fragCurrent === null) {\n keyLoadingPromise = Promise.reject(new Error(`frag load aborted, context changed in KEY_LOADING`));\n }\n } else if (!frag.encrypted && details.encryptedFragments.length) {\n this.keyLoader.loadClear(frag, details.encryptedFragments);\n }\n targetBufferTime = Math.max(frag.start, targetBufferTime || 0);\n if (this.config.lowLatencyMode && frag.sn !== 'initSegment') {\n const partList = details.partList;\n if (partList && progressCallback) {\n if (targetBufferTime > frag.end && details.fragmentHint) {\n frag = details.fragmentHint;\n }\n const partIndex = this.getNextPart(partList, frag, targetBufferTime);\n if (partIndex > -1) {\n const part = partList[partIndex];\n this.log(`Loading part sn: ${frag.sn} p: ${part.index} cc: ${frag.cc} of playlist [${details.startSN}-${details.endSN}] parts [0-${partIndex}-${partList.length - 1}] ${this.logPrefix === '[stream-controller]' ? 'level' : 'track'}: ${frag.level}, target: ${parseFloat(targetBufferTime.toFixed(3))}`);\n this.nextLoadPosition = part.start + part.duration;\n this.state = State.FRAG_LOADING;\n let _result;\n if (keyLoadingPromise) {\n _result = keyLoadingPromise.then(keyLoadedData => {\n if (!keyLoadedData || this.fragContextChanged(keyLoadedData.frag)) {\n return null;\n }\n return this.doFragPartsLoad(frag, part, level, progressCallback);\n }).catch(error => this.handleFragLoadError(error));\n } else {\n _result = this.doFragPartsLoad(frag, part, level, progressCallback).catch(error => this.handleFragLoadError(error));\n }\n this.hls.trigger(Events.FRAG_LOADING, {\n frag,\n part,\n targetBufferTime\n });\n if (this.fragCurrent === null) {\n return Promise.reject(new Error(`frag load aborted, context changed in FRAG_LOADING parts`));\n }\n return _result;\n } else if (!frag.url || this.loadedEndOfParts(partList, targetBufferTime)) {\n // Fragment hint has no parts\n return Promise.resolve(null);\n }\n }\n }\n this.log(`Loading fragment ${frag.sn} cc: ${frag.cc} ${details ? 'of [' + details.startSN + '-' + details.endSN + '] ' : ''}${this.logPrefix === '[stream-controller]' ? 'level' : 'track'}: ${frag.level}, target: ${parseFloat(targetBufferTime.toFixed(3))}`);\n // Don't update nextLoadPosition for fragments which are not buffered\n if (isFiniteNumber(frag.sn) && !this.bitrateTest) {\n this.nextLoadPosition = frag.start + frag.duration;\n }\n this.state = State.FRAG_LOADING;\n\n // Load key before streaming fragment data\n const dataOnProgress = this.config.progressive;\n let result;\n if (dataOnProgress && keyLoadingPromise) {\n result = keyLoadingPromise.then(keyLoadedData => {\n if (!keyLoadedData || this.fragContextChanged(keyLoadedData == null ? void 0 : keyLoadedData.frag)) {\n return null;\n }\n return this.fragmentLoader.load(frag, progressCallback);\n }).catch(error => this.handleFragLoadError(error));\n } else {\n // load unencrypted fragment data with progress event,\n // or handle fragment result after key and fragment are finished loading\n result = Promise.all([this.fragmentLoader.load(frag, dataOnProgress ? progressCallback : undefined), keyLoadingPromise]).then(([fragLoadedData]) => {\n if (!dataOnProgress && fragLoadedData && progressCallback) {\n progressCallback(fragLoadedData);\n }\n return fragLoadedData;\n }).catch(error => this.handleFragLoadError(error));\n }\n this.hls.trigger(Events.FRAG_LOADING, {\n frag,\n targetBufferTime\n });\n if (this.fragCurrent === null) {\n return Promise.reject(new Error(`frag load aborted, context changed in FRAG_LOADING`));\n }\n return result;\n }\n doFragPartsLoad(frag, fromPart, level, progressCallback) {\n return new Promise((resolve, reject) => {\n var _level$details;\n const partsLoaded = [];\n const initialPartList = (_level$details = level.details) == null ? void 0 : _level$details.partList;\n const loadPart = part => {\n this.fragmentLoader.loadPart(frag, part, progressCallback).then(partLoadedData => {\n partsLoaded[part.index] = partLoadedData;\n const loadedPart = partLoadedData.part;\n this.hls.trigger(Events.FRAG_LOADED, partLoadedData);\n const nextPart = getPartWith(level, frag.sn, part.index + 1) || findPart(initialPartList, frag.sn, part.index + 1);\n if (nextPart) {\n loadPart(nextPart);\n } else {\n return resolve({\n frag,\n part: loadedPart,\n partsLoaded\n });\n }\n }).catch(reject);\n };\n loadPart(fromPart);\n });\n }\n handleFragLoadError(error) {\n if ('data' in error) {\n const data = error.data;\n if (error.data && data.details === ErrorDetails.INTERNAL_ABORTED) {\n this.handleFragLoadAborted(data.frag, data.part);\n } else {\n this.hls.trigger(Events.ERROR, data);\n }\n } else {\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.OTHER_ERROR,\n details: ErrorDetails.INTERNAL_EXCEPTION,\n err: error,\n error,\n fatal: true\n });\n }\n return null;\n }\n _handleTransmuxerFlush(chunkMeta) {\n const context = this.getCurrentContext(chunkMeta);\n if (!context || this.state !== State.PARSING) {\n if (!this.fragCurrent && this.state !== State.STOPPED && this.state !== State.ERROR) {\n this.state = State.IDLE;\n }\n return;\n }\n const {\n frag,\n part,\n level\n } = context;\n const now = self.performance.now();\n frag.stats.parsing.end = now;\n if (part) {\n part.stats.parsing.end = now;\n }\n this.updateLevelTiming(frag, part, level, chunkMeta.partial);\n }\n getCurrentContext(chunkMeta) {\n const {\n levels,\n fragCurrent\n } = this;\n const {\n level: levelIndex,\n sn,\n part: partIndex\n } = chunkMeta;\n if (!(levels != null && levels[levelIndex])) {\n this.warn(`Levels object was unset while buffering fragment ${sn} of level ${levelIndex}. The current chunk will not be buffered.`);\n return null;\n }\n const level = levels[levelIndex];\n const part = partIndex > -1 ? getPartWith(level, sn, partIndex) : null;\n const frag = part ? part.fragment : getFragmentWithSN(level, sn, fragCurrent);\n if (!frag) {\n return null;\n }\n if (fragCurrent && fragCurrent !== frag) {\n frag.stats = fragCurrent.stats;\n }\n return {\n frag,\n part,\n level\n };\n }\n bufferFragmentData(data, frag, part, chunkMeta, noBacktracking) {\n var _buffer;\n if (!data || this.state !== State.PARSING) {\n return;\n }\n const {\n data1,\n data2\n } = data;\n let buffer = data1;\n if (data1 && data2) {\n // Combine the moof + mdat so that we buffer with a single append\n buffer = appendUint8Array(data1, data2);\n }\n if (!((_buffer = buffer) != null && _buffer.length)) {\n return;\n }\n const segment = {\n type: data.type,\n frag,\n part,\n chunkMeta,\n parent: frag.type,\n data: buffer\n };\n this.hls.trigger(Events.BUFFER_APPENDING, segment);\n if (data.dropped && data.independent && !part) {\n if (noBacktracking) {\n return;\n }\n // Clear buffer so that we reload previous segments sequentially if required\n this.flushBufferGap(frag);\n }\n }\n flushBufferGap(frag) {\n const media = this.media;\n if (!media) {\n return;\n }\n // If currentTime is not buffered, clear the back buffer so that we can backtrack as much as needed\n if (!BufferHelper.isBuffered(media, media.currentTime)) {\n this.flushMainBuffer(0, frag.start);\n return;\n }\n // Remove back-buffer without interrupting playback to allow back tracking\n const currentTime = media.currentTime;\n const bufferInfo = BufferHelper.bufferInfo(media, currentTime, 0);\n const fragDuration = frag.duration;\n const segmentFraction = Math.min(this.config.maxFragLookUpTolerance * 2, fragDuration * 0.25);\n const start = Math.max(Math.min(frag.start - segmentFraction, bufferInfo.end - segmentFraction), currentTime + segmentFraction);\n if (frag.start - start > segmentFraction) {\n this.flushMainBuffer(start, frag.start);\n }\n }\n getFwdBufferInfo(bufferable, type) {\n const pos = this.getLoadPosition();\n if (!isFiniteNumber(pos)) {\n return null;\n }\n return this.getFwdBufferInfoAtPos(bufferable, pos, type);\n }\n getFwdBufferInfoAtPos(bufferable, pos, type) {\n const {\n config: {\n maxBufferHole\n }\n } = this;\n const bufferInfo = BufferHelper.bufferInfo(bufferable, pos, maxBufferHole);\n // Workaround flaw in getting forward buffer when maxBufferHole is smaller than gap at current pos\n if (bufferInfo.len === 0 && bufferInfo.nextStart !== undefined) {\n const bufferedFragAtPos = this.fragmentTracker.getBufferedFrag(pos, type);\n if (bufferedFragAtPos && bufferInfo.nextStart < bufferedFragAtPos.end) {\n return BufferHelper.bufferInfo(bufferable, pos, Math.max(bufferInfo.nextStart, maxBufferHole));\n }\n }\n return bufferInfo;\n }\n getMaxBufferLength(levelBitrate) {\n const {\n config\n } = this;\n let maxBufLen;\n if (levelBitrate) {\n maxBufLen = Math.max(8 * config.maxBufferSize / levelBitrate, config.maxBufferLength);\n } else {\n maxBufLen = config.maxBufferLength;\n }\n return Math.min(maxBufLen, config.maxMaxBufferLength);\n }\n reduceMaxBufferLength(threshold) {\n const config = this.config;\n const minLength = threshold || config.maxBufferLength;\n const reducedLength = config.maxMaxBufferLength / 2;\n if (reducedLength >= minLength) {\n // reduce max buffer length as it might be too high. we do this to avoid loop flushing ...\n config.maxMaxBufferLength = reducedLength;\n this.warn(`Reduce max buffer length to ${reducedLength}s`);\n return true;\n }\n return false;\n }\n getAppendedFrag(position, playlistType = PlaylistLevelType.MAIN) {\n const fragOrPart = this.fragmentTracker.getAppendedFrag(position, PlaylistLevelType.MAIN);\n if (fragOrPart && 'fragment' in fragOrPart) {\n return fragOrPart.fragment;\n }\n return fragOrPart;\n }\n getNextFragment(pos, levelDetails) {\n const fragments = levelDetails.fragments;\n const fragLen = fragments.length;\n if (!fragLen) {\n return null;\n }\n\n // find fragment index, contiguous with end of buffer position\n const {\n config\n } = this;\n const start = fragments[0].start;\n let frag;\n if (levelDetails.live) {\n const initialLiveManifestSize = config.initialLiveManifestSize;\n if (fragLen < initialLiveManifestSize) {\n this.warn(`Not enough fragments to start playback (have: ${fragLen}, need: ${initialLiveManifestSize})`);\n return null;\n }\n // The real fragment start times for a live stream are only known after the PTS range for that level is known.\n // In order to discover the range, we load the best matching fragment for that level and demux it.\n // Do not load using live logic if the starting frag is requested - we want to use getFragmentAtPosition() so that\n // we get the fragment matching that start time\n if (!levelDetails.PTSKnown && !this.startFragRequested && this.startPosition === -1 || pos < start) {\n frag = this.getInitialLiveFragment(levelDetails, fragments);\n this.startPosition = this.nextLoadPosition = frag ? this.hls.liveSyncPosition || frag.start : pos;\n }\n } else if (pos <= start) {\n // VoD playlist: if loadPosition before start of playlist, load first fragment\n frag = fragments[0];\n }\n\n // If we haven't run into any special cases already, just load the fragment most closely matching the requested position\n if (!frag) {\n const end = config.lowLatencyMode ? levelDetails.partEnd : levelDetails.fragmentEnd;\n frag = this.getFragmentAtPosition(pos, end, levelDetails);\n }\n return this.mapToInitFragWhenRequired(frag);\n }\n isLoopLoading(frag, targetBufferTime) {\n const trackerState = this.fragmentTracker.getState(frag);\n return (trackerState === FragmentState.OK || trackerState === FragmentState.PARTIAL && !!frag.gap) && this.nextLoadPosition > targetBufferTime;\n }\n getNextFragmentLoopLoading(frag, levelDetails, bufferInfo, playlistType, maxBufLen) {\n const gapStart = frag.gap;\n const nextFragment = this.getNextFragment(this.nextLoadPosition, levelDetails);\n if (nextFragment === null) {\n return nextFragment;\n }\n frag = nextFragment;\n if (gapStart && frag && !frag.gap && bufferInfo.nextStart) {\n // Media buffered after GAP tags should not make the next buffer timerange exceed forward buffer length\n const nextbufferInfo = this.getFwdBufferInfoAtPos(this.mediaBuffer ? this.mediaBuffer : this.media, bufferInfo.nextStart, playlistType);\n if (nextbufferInfo !== null && bufferInfo.len + nextbufferInfo.len >= maxBufLen) {\n // Returning here might result in not finding an audio and video candiate to skip to\n this.log(`buffer full after gaps in \"${playlistType}\" playlist starting at sn: ${frag.sn}`);\n return null;\n }\n }\n return frag;\n }\n mapToInitFragWhenRequired(frag) {\n // If an initSegment is present, it must be buffered first\n if (frag != null && frag.initSegment && !(frag != null && frag.initSegment.data) && !this.bitrateTest) {\n return frag.initSegment;\n }\n return frag;\n }\n getNextPart(partList, frag, targetBufferTime) {\n let nextPart = -1;\n let contiguous = false;\n let independentAttrOmitted = true;\n for (let i = 0, len = partList.length; i < len; i++) {\n const part = partList[i];\n independentAttrOmitted = independentAttrOmitted && !part.independent;\n if (nextPart > -1 && targetBufferTime < part.start) {\n break;\n }\n const loaded = part.loaded;\n if (loaded) {\n nextPart = -1;\n } else if ((contiguous || part.independent || independentAttrOmitted) && part.fragment === frag) {\n nextPart = i;\n }\n contiguous = loaded;\n }\n return nextPart;\n }\n loadedEndOfParts(partList, targetBufferTime) {\n const lastPart = partList[partList.length - 1];\n return lastPart && targetBufferTime > lastPart.start && lastPart.loaded;\n }\n\n /*\n This method is used find the best matching first fragment for a live playlist. This fragment is used to calculate the\n \"sliding\" of the playlist, which is its offset from the start of playback. After sliding we can compute the real\n start and end times for each fragment in the playlist (after which this method will not need to be called).\n */\n getInitialLiveFragment(levelDetails, fragments) {\n const fragPrevious = this.fragPrevious;\n let frag = null;\n if (fragPrevious) {\n if (levelDetails.hasProgramDateTime) {\n // Prefer using PDT, because it can be accurate enough to choose the correct fragment without knowing the level sliding\n this.log(`Live playlist, switching playlist, load frag with same PDT: ${fragPrevious.programDateTime}`);\n frag = findFragmentByPDT(fragments, fragPrevious.endProgramDateTime, this.config.maxFragLookUpTolerance);\n }\n if (!frag) {\n // SN does not need to be accurate between renditions, but depending on the packaging it may be so.\n const targetSN = fragPrevious.sn + 1;\n if (targetSN >= levelDetails.startSN && targetSN <= levelDetails.endSN) {\n const fragNext = fragments[targetSN - levelDetails.startSN];\n // Ensure that we're staying within the continuity range, since PTS resets upon a new range\n if (fragPrevious.cc === fragNext.cc) {\n frag = fragNext;\n this.log(`Live playlist, switching playlist, load frag with next SN: ${frag.sn}`);\n }\n }\n // It's important to stay within the continuity range if available; otherwise the fragments in the playlist\n // will have the wrong start times\n if (!frag) {\n frag = findFragWithCC(fragments, fragPrevious.cc);\n if (frag) {\n this.log(`Live playlist, switching playlist, load frag with same CC: ${frag.sn}`);\n }\n }\n }\n } else {\n // Find a new start fragment when fragPrevious is null\n const liveStart = this.hls.liveSyncPosition;\n if (liveStart !== null) {\n frag = this.getFragmentAtPosition(liveStart, this.bitrateTest ? levelDetails.fragmentEnd : levelDetails.edge, levelDetails);\n }\n }\n return frag;\n }\n\n /*\n This method finds the best matching fragment given the provided position.\n */\n getFragmentAtPosition(bufferEnd, end, levelDetails) {\n const {\n config\n } = this;\n let {\n fragPrevious\n } = this;\n let {\n fragments,\n endSN\n } = levelDetails;\n const {\n fragmentHint\n } = levelDetails;\n const {\n maxFragLookUpTolerance\n } = config;\n const partList = levelDetails.partList;\n const loadingParts = !!(config.lowLatencyMode && partList != null && partList.length && fragmentHint);\n if (loadingParts && fragmentHint && !this.bitrateTest) {\n // Include incomplete fragment with parts at end\n fragments = fragments.concat(fragmentHint);\n endSN = fragmentHint.sn;\n }\n let frag;\n if (bufferEnd < end) {\n const lookupTolerance = bufferEnd > end - maxFragLookUpTolerance ? 0 : maxFragLookUpTolerance;\n // Remove the tolerance if it would put the bufferEnd past the actual end of stream\n // Uses buffer and sequence number to calculate switch segment (required if using EXT-X-DISCONTINUITY-SEQUENCE)\n frag = findFragmentByPTS(fragPrevious, fragments, bufferEnd, lookupTolerance);\n } else {\n // reach end of playlist\n frag = fragments[fragments.length - 1];\n }\n if (frag) {\n const curSNIdx = frag.sn - levelDetails.startSN;\n // Move fragPrevious forward to support forcing the next fragment to load\n // when the buffer catches up to a previously buffered range.\n const fragState = this.fragmentTracker.getState(frag);\n if (fragState === FragmentState.OK || fragState === FragmentState.PARTIAL && frag.gap) {\n fragPrevious = frag;\n }\n if (fragPrevious && frag.sn === fragPrevious.sn && (!loadingParts || partList[0].fragment.sn > frag.sn)) {\n // Force the next fragment to load if the previous one was already selected. This can occasionally happen with\n // non-uniform fragment durations\n const sameLevel = fragPrevious && frag.level === fragPrevious.level;\n if (sameLevel) {\n const nextFrag = fragments[curSNIdx + 1];\n if (frag.sn < endSN && this.fragmentTracker.getState(nextFrag) !== FragmentState.OK) {\n frag = nextFrag;\n } else {\n frag = null;\n }\n }\n }\n }\n return frag;\n }\n synchronizeToLiveEdge(levelDetails) {\n const {\n config,\n media\n } = this;\n if (!media) {\n return;\n }\n const liveSyncPosition = this.hls.liveSyncPosition;\n const currentTime = media.currentTime;\n const start = levelDetails.fragments[0].start;\n const end = levelDetails.edge;\n const withinSlidingWindow = currentTime >= start - config.maxFragLookUpTolerance && currentTime <= end;\n // Continue if we can seek forward to sync position or if current time is outside of sliding window\n if (liveSyncPosition !== null && media.duration > liveSyncPosition && (currentTime < liveSyncPosition || !withinSlidingWindow)) {\n // Continue if buffer is starving or if current time is behind max latency\n const maxLatency = config.liveMaxLatencyDuration !== undefined ? config.liveMaxLatencyDuration : config.liveMaxLatencyDurationCount * levelDetails.targetduration;\n if (!withinSlidingWindow && media.readyState < 4 || currentTime < end - maxLatency) {\n if (!this.loadedmetadata) {\n this.nextLoadPosition = liveSyncPosition;\n }\n // Only seek if ready and there is not a significant forward buffer available for playback\n if (media.readyState) {\n this.warn(`Playback: ${currentTime.toFixed(3)} is located too far from the end of live sliding playlist: ${end}, reset currentTime to : ${liveSyncPosition.toFixed(3)}`);\n media.currentTime = liveSyncPosition;\n }\n }\n }\n }\n alignPlaylists(details, previousDetails, switchDetails) {\n // FIXME: If not for `shouldAlignOnDiscontinuities` requiring fragPrevious.cc,\n // this could all go in level-helper mergeDetails()\n const length = details.fragments.length;\n if (!length) {\n this.warn(`No fragments in live playlist`);\n return 0;\n }\n const slidingStart = details.fragments[0].start;\n const firstLevelLoad = !previousDetails;\n const aligned = details.alignedSliding && isFiniteNumber(slidingStart);\n if (firstLevelLoad || !aligned && !slidingStart) {\n const {\n fragPrevious\n } = this;\n alignStream(fragPrevious, switchDetails, details);\n const alignedSlidingStart = details.fragments[0].start;\n this.log(`Live playlist sliding: ${alignedSlidingStart.toFixed(2)} start-sn: ${previousDetails ? previousDetails.startSN : 'na'}->${details.startSN} prev-sn: ${fragPrevious ? fragPrevious.sn : 'na'} fragments: ${length}`);\n return alignedSlidingStart;\n }\n return slidingStart;\n }\n waitForCdnTuneIn(details) {\n // Wait for Low-Latency CDN Tune-in to get an updated playlist\n const advancePartLimit = 3;\n return details.live && details.canBlockReload && details.partTarget && details.tuneInGoal > Math.max(details.partHoldBack, details.partTarget * advancePartLimit);\n }\n setStartPosition(details, sliding) {\n // compute start position if set to -1. use it straight away if value is defined\n let startPosition = this.startPosition;\n if (startPosition < sliding) {\n startPosition = -1;\n }\n if (startPosition === -1 || this.lastCurrentTime === -1) {\n // Use Playlist EXT-X-START:TIME-OFFSET when set\n // Prioritize Multivariant Playlist offset so that main, audio, and subtitle stream-controller start times match\n const offsetInMultivariantPlaylist = this.startTimeOffset !== null;\n const startTimeOffset = offsetInMultivariantPlaylist ? this.startTimeOffset : details.startTimeOffset;\n if (startTimeOffset !== null && isFiniteNumber(startTimeOffset)) {\n startPosition = sliding + startTimeOffset;\n if (startTimeOffset < 0) {\n startPosition += details.totalduration;\n }\n startPosition = Math.min(Math.max(sliding, startPosition), sliding + details.totalduration);\n this.log(`Start time offset ${startTimeOffset} found in ${offsetInMultivariantPlaylist ? 'multivariant' : 'media'} playlist, adjust startPosition to ${startPosition}`);\n this.startPosition = startPosition;\n } else if (details.live) {\n // Leave this.startPosition at -1, so that we can use `getInitialLiveFragment` logic when startPosition has\n // not been specified via the config or an as an argument to startLoad (#3736).\n startPosition = this.hls.liveSyncPosition || sliding;\n } else {\n this.startPosition = startPosition = 0;\n }\n this.lastCurrentTime = startPosition;\n }\n this.nextLoadPosition = startPosition;\n }\n getLoadPosition() {\n const {\n media\n } = this;\n // if we have not yet loaded any fragment, start loading from start position\n let pos = 0;\n if (this.loadedmetadata && media) {\n pos = media.currentTime;\n } else if (this.nextLoadPosition) {\n pos = this.nextLoadPosition;\n }\n return pos;\n }\n handleFragLoadAborted(frag, part) {\n if (this.transmuxer && frag.sn !== 'initSegment' && frag.stats.aborted) {\n this.warn(`Fragment ${frag.sn}${part ? ' part ' + part.index : ''} of level ${frag.level} was aborted`);\n this.resetFragmentLoading(frag);\n }\n }\n resetFragmentLoading(frag) {\n if (!this.fragCurrent || !this.fragContextChanged(frag) && this.state !== State.FRAG_LOADING_WAITING_RETRY) {\n this.state = State.IDLE;\n }\n }\n onFragmentOrKeyLoadError(filterType, data) {\n if (data.chunkMeta && !data.frag) {\n const context = this.getCurrentContext(data.chunkMeta);\n if (context) {\n data.frag = context.frag;\n }\n }\n const frag = data.frag;\n // Handle frag error related to caller's filterType\n if (!frag || frag.type !== filterType || !this.levels) {\n return;\n }\n if (this.fragContextChanged(frag)) {\n var _this$fragCurrent2;\n this.warn(`Frag load error must match current frag to retry ${frag.url} > ${(_this$fragCurrent2 = this.fragCurrent) == null ? void 0 : _this$fragCurrent2.url}`);\n return;\n }\n const gapTagEncountered = data.details === ErrorDetails.FRAG_GAP;\n if (gapTagEncountered) {\n this.fragmentTracker.fragBuffered(frag, true);\n }\n // keep retrying until the limit will be reached\n const errorAction = data.errorAction;\n const {\n action,\n retryCount = 0,\n retryConfig\n } = errorAction || {};\n if (errorAction && action === NetworkErrorAction.RetryRequest && retryConfig) {\n this.resetStartWhenNotLoaded(this.levelLastLoaded);\n const delay = getRetryDelay(retryConfig, retryCount);\n this.warn(`Fragment ${frag.sn} of ${filterType} ${frag.level} errored with ${data.details}, retrying loading ${retryCount + 1}/${retryConfig.maxNumRetry} in ${delay}ms`);\n errorAction.resolved = true;\n this.retryDate = self.performance.now() + delay;\n this.state = State.FRAG_LOADING_WAITING_RETRY;\n } else if (retryConfig && errorAction) {\n this.resetFragmentErrors(filterType);\n if (retryCount < retryConfig.maxNumRetry) {\n // Network retry is skipped when level switch is preferred\n if (!gapTagEncountered && action !== NetworkErrorAction.RemoveAlternatePermanently) {\n errorAction.resolved = true;\n }\n } else {\n logger.warn(`${data.details} reached or exceeded max retry (${retryCount})`);\n return;\n }\n } else if ((errorAction == null ? void 0 : errorAction.action) === NetworkErrorAction.SendAlternateToPenaltyBox) {\n this.state = State.WAITING_LEVEL;\n } else {\n this.state = State.ERROR;\n }\n // Perform next async tick sooner to speed up error action resolution\n this.tickImmediate();\n }\n reduceLengthAndFlushBuffer(data) {\n // if in appending state\n if (this.state === State.PARSING || this.state === State.PARSED) {\n const playlistType = data.parent;\n const bufferedInfo = this.getFwdBufferInfo(this.mediaBuffer, playlistType);\n // 0.5 : tolerance needed as some browsers stalls playback before reaching buffered end\n // reduce max buf len if current position is buffered\n const buffered = bufferedInfo && bufferedInfo.len > 0.5;\n if (buffered) {\n this.reduceMaxBufferLength(bufferedInfo.len);\n }\n const flushBuffer = !buffered;\n if (flushBuffer) {\n // current position is not buffered, but browser is still complaining about buffer full error\n // this happens on IE/Edge, refer to https://github.com/video-dev/hls.js/pull/708\n // in that case flush the whole audio buffer to recover\n this.warn(`Buffer full error while media.currentTime is not buffered, flush ${playlistType} buffer`);\n }\n if (data.frag) {\n this.fragmentTracker.removeFragment(data.frag);\n this.nextLoadPosition = data.frag.start;\n }\n this.resetLoadingState();\n return flushBuffer;\n }\n return false;\n }\n resetFragmentErrors(filterType) {\n if (filterType === PlaylistLevelType.AUDIO) {\n // Reset current fragment since audio track audio is essential and may not have a fail-over track\n this.fragCurrent = null;\n }\n // Fragment errors that result in a level switch or redundant fail-over\n // should reset the stream controller state to idle\n if (!this.loadedmetadata) {\n this.startFragRequested = false;\n }\n if (this.state !== State.STOPPED) {\n this.state = State.IDLE;\n }\n }\n afterBufferFlushed(media, bufferType, playlistType) {\n if (!media) {\n return;\n }\n // After successful buffer flushing, filter flushed fragments from bufferedFrags use mediaBuffered instead of media\n // (so that we will check against video.buffered ranges in case of alt audio track)\n const bufferedTimeRanges = BufferHelper.getBuffered(media);\n this.fragmentTracker.detectEvictedFragments(bufferType, bufferedTimeRanges, playlistType);\n if (this.state === State.ENDED) {\n this.resetLoadingState();\n }\n }\n resetLoadingState() {\n this.log('Reset loading state');\n this.fragCurrent = null;\n this.fragPrevious = null;\n this.state = State.IDLE;\n }\n resetStartWhenNotLoaded(level) {\n // if loadedmetadata is not set, it means that first frag request failed\n // in that case, reset startFragRequested flag\n if (!this.loadedmetadata) {\n this.startFragRequested = false;\n const details = level ? level.details : null;\n if (details != null && details.live) {\n // Update the start position and return to IDLE to recover live start\n this.startPosition = -1;\n this.setStartPosition(details, 0);\n this.resetLoadingState();\n } else {\n this.nextLoadPosition = this.startPosition;\n }\n }\n }\n resetWhenMissingContext(chunkMeta) {\n this.warn(`The loading context changed while buffering fragment ${chunkMeta.sn} of level ${chunkMeta.level}. This chunk will not be buffered.`);\n this.removeUnbufferedFrags();\n this.resetStartWhenNotLoaded(this.levelLastLoaded);\n this.resetLoadingState();\n }\n removeUnbufferedFrags(start = 0) {\n this.fragmentTracker.removeFragmentsInRange(start, Infinity, this.playlistType, false, true);\n }\n updateLevelTiming(frag, part, level, partial) {\n var _this$transmuxer;\n const details = level.details;\n if (!details) {\n this.warn('level.details undefined');\n return;\n }\n const parsed = Object.keys(frag.elementaryStreams).reduce((result, type) => {\n const info = frag.elementaryStreams[type];\n if (info) {\n const parsedDuration = info.endPTS - info.startPTS;\n if (parsedDuration <= 0) {\n // Destroy the transmuxer after it's next time offset failed to advance because duration was <= 0.\n // The new transmuxer will be configured with a time offset matching the next fragment start,\n // preventing the timeline from shifting.\n this.warn(`Could not parse fragment ${frag.sn} ${type} duration reliably (${parsedDuration})`);\n return result || false;\n }\n const drift = partial ? 0 : updateFragPTSDTS(details, frag, info.startPTS, info.endPTS, info.startDTS, info.endDTS);\n this.hls.trigger(Events.LEVEL_PTS_UPDATED, {\n details,\n level,\n drift,\n type,\n frag,\n start: info.startPTS,\n end: info.endPTS\n });\n return true;\n }\n return result;\n }, false);\n if (!parsed && ((_this$transmuxer = this.transmuxer) == null ? void 0 : _this$transmuxer.error) === null) {\n const error = new Error(`Found no media in fragment ${frag.sn} of level ${frag.level} resetting transmuxer to fallback to playlist timing`);\n if (level.fragmentError === 0) {\n // Mark and track the odd empty segment as a gap to avoid reloading\n level.fragmentError++;\n frag.gap = true;\n this.fragmentTracker.removeFragment(frag);\n this.fragmentTracker.fragBuffered(frag, true);\n }\n this.warn(error.message);\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: false,\n error,\n frag,\n reason: `Found no media in msn ${frag.sn} of level \"${level.url}\"`\n });\n if (!this.hls) {\n return;\n }\n this.resetTransmuxer();\n // For this error fallthrough. Marking parsed will allow advancing to next fragment.\n }\n this.state = State.PARSED;\n this.hls.trigger(Events.FRAG_PARSED, {\n frag,\n part\n });\n }\n resetTransmuxer() {\n if (this.transmuxer) {\n this.transmuxer.destroy();\n this.transmuxer = null;\n }\n }\n recoverWorkerError(data) {\n if (data.event === 'demuxerWorker') {\n this.fragmentTracker.removeAllFragments();\n this.resetTransmuxer();\n this.resetStartWhenNotLoaded(this.levelLastLoaded);\n this.resetLoadingState();\n }\n }\n set state(nextState) {\n const previousState = this._state;\n if (previousState !== nextState) {\n this._state = nextState;\n this.log(`${previousState}->${nextState}`);\n }\n }\n get state() {\n return this._state;\n }\n}\n\nclass ChunkCache {\n constructor() {\n this.chunks = [];\n this.dataLength = 0;\n }\n push(chunk) {\n this.chunks.push(chunk);\n this.dataLength += chunk.length;\n }\n flush() {\n const {\n chunks,\n dataLength\n } = this;\n let result;\n if (!chunks.length) {\n return new Uint8Array(0);\n } else if (chunks.length === 1) {\n result = chunks[0];\n } else {\n result = concatUint8Arrays(chunks, dataLength);\n }\n this.reset();\n return result;\n }\n reset() {\n this.chunks.length = 0;\n this.dataLength = 0;\n }\n}\nfunction concatUint8Arrays(chunks, dataLength) {\n const result = new Uint8Array(dataLength);\n let offset = 0;\n for (let i = 0; i < chunks.length; i++) {\n const chunk = chunks[i];\n result.set(chunk, offset);\n offset += chunk.length;\n }\n return result;\n}\n\n// ensure the worker ends up in the bundle\n// If the worker should not be included this gets aliased to empty.js\nfunction hasUMDWorker() {\n return typeof __HLS_WORKER_BUNDLE__ === 'function';\n}\nfunction injectWorker() {\n const blob = new self.Blob([`var exports={};var module={exports:exports};function define(f){f()};define.amd=true;(${__HLS_WORKER_BUNDLE__.toString()})(true);`], {\n type: 'text/javascript'\n });\n const objectURL = self.URL.createObjectURL(blob);\n const worker = new self.Worker(objectURL);\n return {\n worker,\n objectURL\n };\n}\nfunction loadWorker(path) {\n const scriptURL = new self.URL(path, self.location.href).href;\n const worker = new self.Worker(scriptURL);\n return {\n worker,\n scriptURL\n };\n}\n\nfunction dummyTrack(type = '', inputTimeScale = 90000) {\n return {\n type,\n id: -1,\n pid: -1,\n inputTimeScale,\n sequenceNumber: -1,\n samples: [],\n dropped: 0\n };\n}\n\nclass BaseAudioDemuxer {\n constructor() {\n this._audioTrack = void 0;\n this._id3Track = void 0;\n this.frameIndex = 0;\n this.cachedData = null;\n this.basePTS = null;\n this.initPTS = null;\n this.lastPTS = null;\n }\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n this._id3Track = {\n type: 'id3',\n id: 3,\n pid: -1,\n inputTimeScale: 90000,\n sequenceNumber: 0,\n samples: [],\n dropped: 0\n };\n }\n resetTimeStamp(deaultTimestamp) {\n this.initPTS = deaultTimestamp;\n this.resetContiguity();\n }\n resetContiguity() {\n this.basePTS = null;\n this.lastPTS = null;\n this.frameIndex = 0;\n }\n canParse(data, offset) {\n return false;\n }\n appendFrame(track, data, offset) {}\n\n // feed incoming data to the front of the parsing pipeline\n demux(data, timeOffset) {\n if (this.cachedData) {\n data = appendUint8Array(this.cachedData, data);\n this.cachedData = null;\n }\n let id3Data = getID3Data(data, 0);\n let offset = id3Data ? id3Data.length : 0;\n let lastDataIndex;\n const track = this._audioTrack;\n const id3Track = this._id3Track;\n const timestamp = id3Data ? getTimeStamp(id3Data) : undefined;\n const length = data.length;\n if (this.basePTS === null || this.frameIndex === 0 && isFiniteNumber(timestamp)) {\n this.basePTS = initPTSFn(timestamp, timeOffset, this.initPTS);\n this.lastPTS = this.basePTS;\n }\n if (this.lastPTS === null) {\n this.lastPTS = this.basePTS;\n }\n\n // more expressive than alternative: id3Data?.length\n if (id3Data && id3Data.length > 0) {\n id3Track.samples.push({\n pts: this.lastPTS,\n dts: this.lastPTS,\n data: id3Data,\n type: MetadataSchema.audioId3,\n duration: Number.POSITIVE_INFINITY\n });\n }\n while (offset < length) {\n if (this.canParse(data, offset)) {\n const frame = this.appendFrame(track, data, offset);\n if (frame) {\n this.frameIndex++;\n this.lastPTS = frame.sample.pts;\n offset += frame.length;\n lastDataIndex = offset;\n } else {\n offset = length;\n }\n } else if (canParse$2(data, offset)) {\n // after a ID3.canParse, a call to ID3.getID3Data *should* always returns some data\n id3Data = getID3Data(data, offset);\n id3Track.samples.push({\n pts: this.lastPTS,\n dts: this.lastPTS,\n data: id3Data,\n type: MetadataSchema.audioId3,\n duration: Number.POSITIVE_INFINITY\n });\n offset += id3Data.length;\n lastDataIndex = offset;\n } else {\n offset++;\n }\n if (offset === length && lastDataIndex !== length) {\n const partialData = sliceUint8(data, lastDataIndex);\n if (this.cachedData) {\n this.cachedData = appendUint8Array(this.cachedData, partialData);\n } else {\n this.cachedData = partialData;\n }\n }\n }\n return {\n audioTrack: track,\n videoTrack: dummyTrack(),\n id3Track,\n textTrack: dummyTrack()\n };\n }\n demuxSampleAes(data, keyData, timeOffset) {\n return Promise.reject(new Error(`[${this}] This demuxer does not support Sample-AES decryption`));\n }\n flush(timeOffset) {\n // Parse cache in case of remaining frames.\n const cachedData = this.cachedData;\n if (cachedData) {\n this.cachedData = null;\n this.demux(cachedData, 0);\n }\n return {\n audioTrack: this._audioTrack,\n videoTrack: dummyTrack(),\n id3Track: this._id3Track,\n textTrack: dummyTrack()\n };\n }\n destroy() {}\n}\n\n/**\n * Initialize PTS\n * \n * use timestamp unless it is undefined, NaN or Infinity\n *
\n */\nconst initPTSFn = (timestamp, timeOffset, initPTS) => {\n if (isFiniteNumber(timestamp)) {\n return timestamp * 90;\n }\n const init90kHz = initPTS ? initPTS.baseTime * 90000 / initPTS.timescale : 0;\n return timeOffset * 90000 + init90kHz;\n};\n\n/**\n * ADTS parser helper\n * @link https://wiki.multimedia.cx/index.php?title=ADTS\n */\nfunction getAudioConfig(observer, data, offset, audioCodec) {\n let adtsObjectType;\n let adtsExtensionSamplingIndex;\n let adtsChannelConfig;\n let config;\n const userAgent = navigator.userAgent.toLowerCase();\n const manifestCodec = audioCodec;\n const adtsSamplingRates = [96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025, 8000, 7350];\n // byte 2\n adtsObjectType = ((data[offset + 2] & 0xc0) >>> 6) + 1;\n const adtsSamplingIndex = (data[offset + 2] & 0x3c) >>> 2;\n if (adtsSamplingIndex > adtsSamplingRates.length - 1) {\n const error = new Error(`invalid ADTS sampling index:${adtsSamplingIndex}`);\n observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: true,\n error,\n reason: error.message\n });\n return;\n }\n adtsChannelConfig = (data[offset + 2] & 0x01) << 2;\n // byte 3\n adtsChannelConfig |= (data[offset + 3] & 0xc0) >>> 6;\n logger.log(`manifest codec:${audioCodec}, ADTS type:${adtsObjectType}, samplingIndex:${adtsSamplingIndex}`);\n // firefox: freq less than 24kHz = AAC SBR (HE-AAC)\n if (/firefox/i.test(userAgent)) {\n if (adtsSamplingIndex >= 6) {\n adtsObjectType = 5;\n config = new Array(4);\n // HE-AAC uses SBR (Spectral Band Replication) , high frequencies are constructed from low frequencies\n // there is a factor 2 between frame sample rate and output sample rate\n // multiply frequency by 2 (see table below, equivalent to substract 3)\n adtsExtensionSamplingIndex = adtsSamplingIndex - 3;\n } else {\n adtsObjectType = 2;\n config = new Array(2);\n adtsExtensionSamplingIndex = adtsSamplingIndex;\n }\n // Android : always use AAC\n } else if (userAgent.indexOf('android') !== -1) {\n adtsObjectType = 2;\n config = new Array(2);\n adtsExtensionSamplingIndex = adtsSamplingIndex;\n } else {\n /* for other browsers (Chrome/Vivaldi/Opera ...)\n always force audio type to be HE-AAC SBR, as some browsers do not support audio codec switch properly (like Chrome ...)\n */\n adtsObjectType = 5;\n config = new Array(4);\n // if (manifest codec is HE-AAC or HE-AACv2) OR (manifest codec not specified AND frequency less than 24kHz)\n if (audioCodec && (audioCodec.indexOf('mp4a.40.29') !== -1 || audioCodec.indexOf('mp4a.40.5') !== -1) || !audioCodec && adtsSamplingIndex >= 6) {\n // HE-AAC uses SBR (Spectral Band Replication) , high frequencies are constructed from low frequencies\n // there is a factor 2 between frame sample rate and output sample rate\n // multiply frequency by 2 (see table below, equivalent to substract 3)\n adtsExtensionSamplingIndex = adtsSamplingIndex - 3;\n } else {\n // if (manifest codec is AAC) AND (frequency less than 24kHz AND nb channel is 1) OR (manifest codec not specified and mono audio)\n // Chrome fails to play back with low frequency AAC LC mono when initialized with HE-AAC. This is not a problem with stereo.\n if (audioCodec && audioCodec.indexOf('mp4a.40.2') !== -1 && (adtsSamplingIndex >= 6 && adtsChannelConfig === 1 || /vivaldi/i.test(userAgent)) || !audioCodec && adtsChannelConfig === 1) {\n adtsObjectType = 2;\n config = new Array(2);\n }\n adtsExtensionSamplingIndex = adtsSamplingIndex;\n }\n }\n /* refer to http://wiki.multimedia.cx/index.php?title=MPEG-4_Audio#Audio_Specific_Config\n ISO 14496-3 (AAC).pdf - Table 1.13 — Syntax of AudioSpecificConfig()\n Audio Profile / Audio Object Type\n 0: Null\n 1: AAC Main\n 2: AAC LC (Low Complexity)\n 3: AAC SSR (Scalable Sample Rate)\n 4: AAC LTP (Long Term Prediction)\n 5: SBR (Spectral Band Replication)\n 6: AAC Scalable\n sampling freq\n 0: 96000 Hz\n 1: 88200 Hz\n 2: 64000 Hz\n 3: 48000 Hz\n 4: 44100 Hz\n 5: 32000 Hz\n 6: 24000 Hz\n 7: 22050 Hz\n 8: 16000 Hz\n 9: 12000 Hz\n 10: 11025 Hz\n 11: 8000 Hz\n 12: 7350 Hz\n 13: Reserved\n 14: Reserved\n 15: frequency is written explictly\n Channel Configurations\n These are the channel configurations:\n 0: Defined in AOT Specifc Config\n 1: 1 channel: front-center\n 2: 2 channels: front-left, front-right\n */\n // audioObjectType = profile => profile, the MPEG-4 Audio Object Type minus 1\n config[0] = adtsObjectType << 3;\n // samplingFrequencyIndex\n config[0] |= (adtsSamplingIndex & 0x0e) >> 1;\n config[1] |= (adtsSamplingIndex & 0x01) << 7;\n // channelConfiguration\n config[1] |= adtsChannelConfig << 3;\n if (adtsObjectType === 5) {\n // adtsExtensionSamplingIndex\n config[1] |= (adtsExtensionSamplingIndex & 0x0e) >> 1;\n config[2] = (adtsExtensionSamplingIndex & 0x01) << 7;\n // adtsObjectType (force to 2, chrome is checking that object type is less than 5 ???\n // https://chromium.googlesource.com/chromium/src.git/+/master/media/formats/mp4/aac.cc\n config[2] |= 2 << 2;\n config[3] = 0;\n }\n return {\n config,\n samplerate: adtsSamplingRates[adtsSamplingIndex],\n channelCount: adtsChannelConfig,\n codec: 'mp4a.40.' + adtsObjectType,\n manifestCodec\n };\n}\nfunction isHeaderPattern$1(data, offset) {\n return data[offset] === 0xff && (data[offset + 1] & 0xf6) === 0xf0;\n}\nfunction getHeaderLength(data, offset) {\n return data[offset + 1] & 0x01 ? 7 : 9;\n}\nfunction getFullFrameLength(data, offset) {\n return (data[offset + 3] & 0x03) << 11 | data[offset + 4] << 3 | (data[offset + 5] & 0xe0) >>> 5;\n}\nfunction canGetFrameLength(data, offset) {\n return offset + 5 < data.length;\n}\nfunction isHeader$1(data, offset) {\n // Look for ADTS header | 1111 1111 | 1111 X00X | where X can be either 0 or 1\n // Layer bits (position 14 and 15) in header should be always 0 for ADTS\n // More info https://wiki.multimedia.cx/index.php?title=ADTS\n return offset + 1 < data.length && isHeaderPattern$1(data, offset);\n}\nfunction canParse$1(data, offset) {\n return canGetFrameLength(data, offset) && isHeaderPattern$1(data, offset) && getFullFrameLength(data, offset) <= data.length - offset;\n}\nfunction probe$1(data, offset) {\n // same as isHeader but we also check that ADTS frame follows last ADTS frame\n // or end of data is reached\n if (isHeader$1(data, offset)) {\n // ADTS header Length\n const headerLength = getHeaderLength(data, offset);\n if (offset + headerLength >= data.length) {\n return false;\n }\n // ADTS frame Length\n const frameLength = getFullFrameLength(data, offset);\n if (frameLength <= headerLength) {\n return false;\n }\n const newOffset = offset + frameLength;\n return newOffset === data.length || isHeader$1(data, newOffset);\n }\n return false;\n}\nfunction initTrackConfig(track, observer, data, offset, audioCodec) {\n if (!track.samplerate) {\n const config = getAudioConfig(observer, data, offset, audioCodec);\n if (!config) {\n return;\n }\n track.config = config.config;\n track.samplerate = config.samplerate;\n track.channelCount = config.channelCount;\n track.codec = config.codec;\n track.manifestCodec = config.manifestCodec;\n logger.log(`parsed codec:${track.codec}, rate:${config.samplerate}, channels:${config.channelCount}`);\n }\n}\nfunction getFrameDuration(samplerate) {\n return 1024 * 90000 / samplerate;\n}\nfunction parseFrameHeader(data, offset) {\n // The protection skip bit tells us if we have 2 bytes of CRC data at the end of the ADTS header\n const headerLength = getHeaderLength(data, offset);\n if (offset + headerLength <= data.length) {\n // retrieve frame size\n const frameLength = getFullFrameLength(data, offset) - headerLength;\n if (frameLength > 0) {\n // logger.log(`AAC frame, offset/length/total/pts:${offset+headerLength}/${frameLength}/${data.byteLength}`);\n return {\n headerLength,\n frameLength\n };\n }\n }\n}\nfunction appendFrame$2(track, data, offset, pts, frameIndex) {\n const frameDuration = getFrameDuration(track.samplerate);\n const stamp = pts + frameIndex * frameDuration;\n const header = parseFrameHeader(data, offset);\n let unit;\n if (header) {\n const {\n frameLength,\n headerLength\n } = header;\n const _length = headerLength + frameLength;\n const missing = Math.max(0, offset + _length - data.length);\n // logger.log(`AAC frame ${frameIndex}, pts:${stamp} length@offset/total: ${frameLength}@${offset+headerLength}/${data.byteLength} missing: ${missing}`);\n if (missing) {\n unit = new Uint8Array(_length - headerLength);\n unit.set(data.subarray(offset + headerLength, data.length), 0);\n } else {\n unit = data.subarray(offset + headerLength, offset + _length);\n }\n const _sample = {\n unit,\n pts: stamp\n };\n if (!missing) {\n track.samples.push(_sample);\n }\n return {\n sample: _sample,\n length: _length,\n missing\n };\n }\n // overflow incomplete header\n const length = data.length - offset;\n unit = new Uint8Array(length);\n unit.set(data.subarray(offset, data.length), 0);\n const sample = {\n unit,\n pts: stamp\n };\n return {\n sample,\n length,\n missing: -1\n };\n}\n\n/**\n * MPEG parser helper\n */\n\nlet chromeVersion$1 = null;\nconst BitratesMap = [32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160];\nconst SamplingRateMap = [44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000];\nconst SamplesCoefficients = [\n// MPEG 2.5\n[0,\n// Reserved\n72,\n// Layer3\n144,\n// Layer2\n12 // Layer1\n],\n// Reserved\n[0,\n// Reserved\n0,\n// Layer3\n0,\n// Layer2\n0 // Layer1\n],\n// MPEG 2\n[0,\n// Reserved\n72,\n// Layer3\n144,\n// Layer2\n12 // Layer1\n],\n// MPEG 1\n[0,\n// Reserved\n144,\n// Layer3\n144,\n// Layer2\n12 // Layer1\n]];\nconst BytesInSlot = [0,\n// Reserved\n1,\n// Layer3\n1,\n// Layer2\n4 // Layer1\n];\nfunction appendFrame$1(track, data, offset, pts, frameIndex) {\n // Using http://www.datavoyage.com/mpgscript/mpeghdr.htm as a reference\n if (offset + 24 > data.length) {\n return;\n }\n const header = parseHeader(data, offset);\n if (header && offset + header.frameLength <= data.length) {\n const frameDuration = header.samplesPerFrame * 90000 / header.sampleRate;\n const stamp = pts + frameIndex * frameDuration;\n const sample = {\n unit: data.subarray(offset, offset + header.frameLength),\n pts: stamp,\n dts: stamp\n };\n track.config = [];\n track.channelCount = header.channelCount;\n track.samplerate = header.sampleRate;\n track.samples.push(sample);\n return {\n sample,\n length: header.frameLength,\n missing: 0\n };\n }\n}\nfunction parseHeader(data, offset) {\n const mpegVersion = data[offset + 1] >> 3 & 3;\n const mpegLayer = data[offset + 1] >> 1 & 3;\n const bitRateIndex = data[offset + 2] >> 4 & 15;\n const sampleRateIndex = data[offset + 2] >> 2 & 3;\n if (mpegVersion !== 1 && bitRateIndex !== 0 && bitRateIndex !== 15 && sampleRateIndex !== 3) {\n const paddingBit = data[offset + 2] >> 1 & 1;\n const channelMode = data[offset + 3] >> 6;\n const columnInBitrates = mpegVersion === 3 ? 3 - mpegLayer : mpegLayer === 3 ? 3 : 4;\n const bitRate = BitratesMap[columnInBitrates * 14 + bitRateIndex - 1] * 1000;\n const columnInSampleRates = mpegVersion === 3 ? 0 : mpegVersion === 2 ? 1 : 2;\n const sampleRate = SamplingRateMap[columnInSampleRates * 3 + sampleRateIndex];\n const channelCount = channelMode === 3 ? 1 : 2; // If bits of channel mode are `11` then it is a single channel (Mono)\n const sampleCoefficient = SamplesCoefficients[mpegVersion][mpegLayer];\n const bytesInSlot = BytesInSlot[mpegLayer];\n const samplesPerFrame = sampleCoefficient * 8 * bytesInSlot;\n const frameLength = Math.floor(sampleCoefficient * bitRate / sampleRate + paddingBit) * bytesInSlot;\n if (chromeVersion$1 === null) {\n const userAgent = navigator.userAgent || '';\n const result = userAgent.match(/Chrome\\/(\\d+)/i);\n chromeVersion$1 = result ? parseInt(result[1]) : 0;\n }\n const needChromeFix = !!chromeVersion$1 && chromeVersion$1 <= 87;\n if (needChromeFix && mpegLayer === 2 && bitRate >= 224000 && channelMode === 0) {\n // Work around bug in Chromium by setting channelMode to dual-channel (01) instead of stereo (00)\n data[offset + 3] = data[offset + 3] | 0x80;\n }\n return {\n sampleRate,\n channelCount,\n frameLength,\n samplesPerFrame\n };\n }\n}\nfunction isHeaderPattern(data, offset) {\n return data[offset] === 0xff && (data[offset + 1] & 0xe0) === 0xe0 && (data[offset + 1] & 0x06) !== 0x00;\n}\nfunction isHeader(data, offset) {\n // Look for MPEG header | 1111 1111 | 111X XYZX | where X can be either 0 or 1 and Y or Z should be 1\n // Layer bits (position 14 and 15) in header should be always different from 0 (Layer I or Layer II or Layer III)\n // More info http://www.mp3-tech.org/programmer/frame_header.html\n return offset + 1 < data.length && isHeaderPattern(data, offset);\n}\nfunction canParse(data, offset) {\n const headerSize = 4;\n return isHeaderPattern(data, offset) && headerSize <= data.length - offset;\n}\nfunction probe(data, offset) {\n // same as isHeader but we also check that MPEG frame follows last MPEG frame\n // or end of data is reached\n if (offset + 1 < data.length && isHeaderPattern(data, offset)) {\n // MPEG header Length\n const headerLength = 4;\n // MPEG frame Length\n const header = parseHeader(data, offset);\n let frameLength = headerLength;\n if (header != null && header.frameLength) {\n frameLength = header.frameLength;\n }\n const newOffset = offset + frameLength;\n return newOffset === data.length || isHeader(data, newOffset);\n }\n return false;\n}\n\n/**\n * AAC demuxer\n */\nclass AACDemuxer extends BaseAudioDemuxer {\n constructor(observer, config) {\n super();\n this.observer = void 0;\n this.config = void 0;\n this.observer = observer;\n this.config = config;\n }\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n super.resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration);\n this._audioTrack = {\n container: 'audio/adts',\n type: 'audio',\n id: 2,\n pid: -1,\n sequenceNumber: 0,\n segmentCodec: 'aac',\n samples: [],\n manifestCodec: audioCodec,\n duration: trackDuration,\n inputTimeScale: 90000,\n dropped: 0\n };\n }\n\n // Source for probe info - https://wiki.multimedia.cx/index.php?title=ADTS\n static probe(data) {\n if (!data) {\n return false;\n }\n\n // Check for the ADTS sync word\n // Look for ADTS header | 1111 1111 | 1111 X00X | where X can be either 0 or 1\n // Layer bits (position 14 and 15) in header should be always 0 for ADTS\n // More info https://wiki.multimedia.cx/index.php?title=ADTS\n const id3Data = getID3Data(data, 0);\n let offset = (id3Data == null ? void 0 : id3Data.length) || 0;\n if (probe(data, offset)) {\n return false;\n }\n for (let length = data.length; offset < length; offset++) {\n if (probe$1(data, offset)) {\n logger.log('ADTS sync word found !');\n return true;\n }\n }\n return false;\n }\n canParse(data, offset) {\n return canParse$1(data, offset);\n }\n appendFrame(track, data, offset) {\n initTrackConfig(track, this.observer, data, offset, track.manifestCodec);\n const frame = appendFrame$2(track, data, offset, this.basePTS, this.frameIndex);\n if (frame && frame.missing === 0) {\n return frame;\n }\n }\n}\n\nconst emsgSchemePattern = /\\/emsg[-/]ID3/i;\nclass MP4Demuxer {\n constructor(observer, config) {\n this.remainderData = null;\n this.timeOffset = 0;\n this.config = void 0;\n this.videoTrack = void 0;\n this.audioTrack = void 0;\n this.id3Track = void 0;\n this.txtTrack = void 0;\n this.config = config;\n }\n resetTimeStamp() {}\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n const videoTrack = this.videoTrack = dummyTrack('video', 1);\n const audioTrack = this.audioTrack = dummyTrack('audio', 1);\n const captionTrack = this.txtTrack = dummyTrack('text', 1);\n this.id3Track = dummyTrack('id3', 1);\n this.timeOffset = 0;\n if (!(initSegment != null && initSegment.byteLength)) {\n return;\n }\n const initData = parseInitSegment(initSegment);\n if (initData.video) {\n const {\n id,\n timescale,\n codec\n } = initData.video;\n videoTrack.id = id;\n videoTrack.timescale = captionTrack.timescale = timescale;\n videoTrack.codec = codec;\n }\n if (initData.audio) {\n const {\n id,\n timescale,\n codec\n } = initData.audio;\n audioTrack.id = id;\n audioTrack.timescale = timescale;\n audioTrack.codec = codec;\n }\n captionTrack.id = RemuxerTrackIdConfig.text;\n videoTrack.sampleDuration = 0;\n videoTrack.duration = audioTrack.duration = trackDuration;\n }\n resetContiguity() {\n this.remainderData = null;\n }\n static probe(data) {\n return hasMoofData(data);\n }\n demux(data, timeOffset) {\n this.timeOffset = timeOffset;\n // Load all data into the avc track. The CMAF remuxer will look for the data in the samples object; the rest of the fields do not matter\n let videoSamples = data;\n const videoTrack = this.videoTrack;\n const textTrack = this.txtTrack;\n if (this.config.progressive) {\n // Split the bytestream into two ranges: one encompassing all data up until the start of the last moof, and everything else.\n // This is done to guarantee that we're sending valid data to MSE - when demuxing progressively, we have no guarantee\n // that the fetch loader gives us flush moof+mdat pairs. If we push jagged data to MSE, it will throw an exception.\n if (this.remainderData) {\n videoSamples = appendUint8Array(this.remainderData, data);\n }\n const segmentedData = segmentValidRange(videoSamples);\n this.remainderData = segmentedData.remainder;\n videoTrack.samples = segmentedData.valid || new Uint8Array();\n } else {\n videoTrack.samples = videoSamples;\n }\n const id3Track = this.extractID3Track(videoTrack, timeOffset);\n textTrack.samples = parseSamples(timeOffset, videoTrack);\n return {\n videoTrack,\n audioTrack: this.audioTrack,\n id3Track,\n textTrack: this.txtTrack\n };\n }\n flush() {\n const timeOffset = this.timeOffset;\n const videoTrack = this.videoTrack;\n const textTrack = this.txtTrack;\n videoTrack.samples = this.remainderData || new Uint8Array();\n this.remainderData = null;\n const id3Track = this.extractID3Track(videoTrack, this.timeOffset);\n textTrack.samples = parseSamples(timeOffset, videoTrack);\n return {\n videoTrack,\n audioTrack: dummyTrack(),\n id3Track,\n textTrack: dummyTrack()\n };\n }\n extractID3Track(videoTrack, timeOffset) {\n const id3Track = this.id3Track;\n if (videoTrack.samples.length) {\n const emsgs = findBox(videoTrack.samples, ['emsg']);\n if (emsgs) {\n emsgs.forEach(data => {\n const emsgInfo = parseEmsg(data);\n if (emsgSchemePattern.test(emsgInfo.schemeIdUri)) {\n const pts = isFiniteNumber(emsgInfo.presentationTime) ? emsgInfo.presentationTime / emsgInfo.timeScale : timeOffset + emsgInfo.presentationTimeDelta / emsgInfo.timeScale;\n let duration = emsgInfo.eventDuration === 0xffffffff ? Number.POSITIVE_INFINITY : emsgInfo.eventDuration / emsgInfo.timeScale;\n // Safari takes anything <= 0.001 seconds and maps it to Infinity\n if (duration <= 0.001) {\n duration = Number.POSITIVE_INFINITY;\n }\n const payload = emsgInfo.payload;\n id3Track.samples.push({\n data: payload,\n len: payload.byteLength,\n dts: pts,\n pts: pts,\n type: MetadataSchema.emsg,\n duration: duration\n });\n }\n });\n }\n }\n return id3Track;\n }\n demuxSampleAes(data, keyData, timeOffset) {\n return Promise.reject(new Error('The MP4 demuxer does not support SAMPLE-AES decryption'));\n }\n destroy() {}\n}\n\nconst getAudioBSID = (data, offset) => {\n // check the bsid to confirm ac-3 | ec-3\n let bsid = 0;\n let numBits = 5;\n offset += numBits;\n const temp = new Uint32Array(1); // unsigned 32 bit for temporary storage\n const mask = new Uint32Array(1); // unsigned 32 bit mask value\n const byte = new Uint8Array(1); // unsigned 8 bit for temporary storage\n while (numBits > 0) {\n byte[0] = data[offset];\n // read remaining bits, upto 8 bits at a time\n const bits = Math.min(numBits, 8);\n const shift = 8 - bits;\n mask[0] = 0xff000000 >>> 24 + shift << shift;\n temp[0] = (byte[0] & mask[0]) >> shift;\n bsid = !bsid ? temp[0] : bsid << bits | temp[0];\n offset += 1;\n numBits -= bits;\n }\n return bsid;\n};\n\nclass AC3Demuxer extends BaseAudioDemuxer {\n constructor(observer) {\n super();\n this.observer = void 0;\n this.observer = observer;\n }\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n super.resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration);\n this._audioTrack = {\n container: 'audio/ac-3',\n type: 'audio',\n id: 2,\n pid: -1,\n sequenceNumber: 0,\n segmentCodec: 'ac3',\n samples: [],\n manifestCodec: audioCodec,\n duration: trackDuration,\n inputTimeScale: 90000,\n dropped: 0\n };\n }\n canParse(data, offset) {\n return offset + 64 < data.length;\n }\n appendFrame(track, data, offset) {\n const frameLength = appendFrame(track, data, offset, this.basePTS, this.frameIndex);\n if (frameLength !== -1) {\n const sample = track.samples[track.samples.length - 1];\n return {\n sample,\n length: frameLength,\n missing: 0\n };\n }\n }\n static probe(data) {\n if (!data) {\n return false;\n }\n const id3Data = getID3Data(data, 0);\n if (!id3Data) {\n return false;\n }\n\n // look for the ac-3 sync bytes\n const offset = id3Data.length;\n if (data[offset] === 0x0b && data[offset + 1] === 0x77 && getTimeStamp(id3Data) !== undefined &&\n // check the bsid to confirm ac-3\n getAudioBSID(data, offset) < 16) {\n return true;\n }\n return false;\n }\n}\nfunction appendFrame(track, data, start, pts, frameIndex) {\n if (start + 8 > data.length) {\n return -1; // not enough bytes left\n }\n if (data[start] !== 0x0b || data[start + 1] !== 0x77) {\n return -1; // invalid magic\n }\n\n // get sample rate\n const samplingRateCode = data[start + 4] >> 6;\n if (samplingRateCode >= 3) {\n return -1; // invalid sampling rate\n }\n const samplingRateMap = [48000, 44100, 32000];\n const sampleRate = samplingRateMap[samplingRateCode];\n\n // get frame size\n const frameSizeCode = data[start + 4] & 0x3f;\n const frameSizeMap = [64, 69, 96, 64, 70, 96, 80, 87, 120, 80, 88, 120, 96, 104, 144, 96, 105, 144, 112, 121, 168, 112, 122, 168, 128, 139, 192, 128, 140, 192, 160, 174, 240, 160, 175, 240, 192, 208, 288, 192, 209, 288, 224, 243, 336, 224, 244, 336, 256, 278, 384, 256, 279, 384, 320, 348, 480, 320, 349, 480, 384, 417, 576, 384, 418, 576, 448, 487, 672, 448, 488, 672, 512, 557, 768, 512, 558, 768, 640, 696, 960, 640, 697, 960, 768, 835, 1152, 768, 836, 1152, 896, 975, 1344, 896, 976, 1344, 1024, 1114, 1536, 1024, 1115, 1536, 1152, 1253, 1728, 1152, 1254, 1728, 1280, 1393, 1920, 1280, 1394, 1920];\n const frameLength = frameSizeMap[frameSizeCode * 3 + samplingRateCode] * 2;\n if (start + frameLength > data.length) {\n return -1;\n }\n\n // get channel count\n const channelMode = data[start + 6] >> 5;\n let skipCount = 0;\n if (channelMode === 2) {\n skipCount += 2;\n } else {\n if (channelMode & 1 && channelMode !== 1) {\n skipCount += 2;\n }\n if (channelMode & 4) {\n skipCount += 2;\n }\n }\n const lfeon = (data[start + 6] << 8 | data[start + 7]) >> 12 - skipCount & 1;\n const channelsMap = [2, 1, 2, 3, 3, 4, 4, 5];\n const channelCount = channelsMap[channelMode] + lfeon;\n\n // build dac3 box\n const bsid = data[start + 5] >> 3;\n const bsmod = data[start + 5] & 7;\n const config = new Uint8Array([samplingRateCode << 6 | bsid << 1 | bsmod >> 2, (bsmod & 3) << 6 | channelMode << 3 | lfeon << 2 | frameSizeCode >> 4, frameSizeCode << 4 & 0xe0]);\n const frameDuration = 1536 / sampleRate * 90000;\n const stamp = pts + frameIndex * frameDuration;\n const unit = data.subarray(start, start + frameLength);\n track.config = config;\n track.channelCount = channelCount;\n track.samplerate = sampleRate;\n track.samples.push({\n unit,\n pts: stamp\n });\n return frameLength;\n}\n\nclass BaseVideoParser {\n constructor() {\n this.VideoSample = null;\n }\n createVideoSample(key, pts, dts, debug) {\n return {\n key,\n frame: false,\n pts,\n dts,\n units: [],\n debug,\n length: 0\n };\n }\n getLastNalUnit(samples) {\n var _VideoSample;\n let VideoSample = this.VideoSample;\n let lastUnit;\n // try to fallback to previous sample if current one is empty\n if (!VideoSample || VideoSample.units.length === 0) {\n VideoSample = samples[samples.length - 1];\n }\n if ((_VideoSample = VideoSample) != null && _VideoSample.units) {\n const units = VideoSample.units;\n lastUnit = units[units.length - 1];\n }\n return lastUnit;\n }\n pushAccessUnit(VideoSample, videoTrack) {\n if (VideoSample.units.length && VideoSample.frame) {\n // if sample does not have PTS/DTS, patch with last sample PTS/DTS\n if (VideoSample.pts === undefined) {\n const samples = videoTrack.samples;\n const nbSamples = samples.length;\n if (nbSamples) {\n const lastSample = samples[nbSamples - 1];\n VideoSample.pts = lastSample.pts;\n VideoSample.dts = lastSample.dts;\n } else {\n // dropping samples, no timestamp found\n videoTrack.dropped++;\n return;\n }\n }\n videoTrack.samples.push(VideoSample);\n }\n if (VideoSample.debug.length) {\n logger.log(VideoSample.pts + '/' + VideoSample.dts + ':' + VideoSample.debug);\n }\n }\n}\n\n/**\n * Parser for exponential Golomb codes, a variable-bitwidth number encoding scheme used by h264.\n */\n\nclass ExpGolomb {\n constructor(data) {\n this.data = void 0;\n this.bytesAvailable = void 0;\n this.word = void 0;\n this.bitsAvailable = void 0;\n this.data = data;\n // the number of bytes left to examine in this.data\n this.bytesAvailable = data.byteLength;\n // the current word being examined\n this.word = 0; // :uint\n // the number of bits left to examine in the current word\n this.bitsAvailable = 0; // :uint\n }\n\n // ():void\n loadWord() {\n const data = this.data;\n const bytesAvailable = this.bytesAvailable;\n const position = data.byteLength - bytesAvailable;\n const workingBytes = new Uint8Array(4);\n const availableBytes = Math.min(4, bytesAvailable);\n if (availableBytes === 0) {\n throw new Error('no bytes available');\n }\n workingBytes.set(data.subarray(position, position + availableBytes));\n this.word = new DataView(workingBytes.buffer).getUint32(0);\n // track the amount of this.data that has been processed\n this.bitsAvailable = availableBytes * 8;\n this.bytesAvailable -= availableBytes;\n }\n\n // (count:int):void\n skipBits(count) {\n let skipBytes; // :int\n count = Math.min(count, this.bytesAvailable * 8 + this.bitsAvailable);\n if (this.bitsAvailable > count) {\n this.word <<= count;\n this.bitsAvailable -= count;\n } else {\n count -= this.bitsAvailable;\n skipBytes = count >> 3;\n count -= skipBytes << 3;\n this.bytesAvailable -= skipBytes;\n this.loadWord();\n this.word <<= count;\n this.bitsAvailable -= count;\n }\n }\n\n // (size:int):uint\n readBits(size) {\n let bits = Math.min(this.bitsAvailable, size); // :uint\n const valu = this.word >>> 32 - bits; // :uint\n if (size > 32) {\n logger.error('Cannot read more than 32 bits at a time');\n }\n this.bitsAvailable -= bits;\n if (this.bitsAvailable > 0) {\n this.word <<= bits;\n } else if (this.bytesAvailable > 0) {\n this.loadWord();\n } else {\n throw new Error('no bits available');\n }\n bits = size - bits;\n if (bits > 0 && this.bitsAvailable) {\n return valu << bits | this.readBits(bits);\n } else {\n return valu;\n }\n }\n\n // ():uint\n skipLZ() {\n let leadingZeroCount; // :uint\n for (leadingZeroCount = 0; leadingZeroCount < this.bitsAvailable; ++leadingZeroCount) {\n if ((this.word & 0x80000000 >>> leadingZeroCount) !== 0) {\n // the first bit of working word is 1\n this.word <<= leadingZeroCount;\n this.bitsAvailable -= leadingZeroCount;\n return leadingZeroCount;\n }\n }\n // we exhausted word and still have not found a 1\n this.loadWord();\n return leadingZeroCount + this.skipLZ();\n }\n\n // ():void\n skipUEG() {\n this.skipBits(1 + this.skipLZ());\n }\n\n // ():void\n skipEG() {\n this.skipBits(1 + this.skipLZ());\n }\n\n // ():uint\n readUEG() {\n const clz = this.skipLZ(); // :uint\n return this.readBits(clz + 1) - 1;\n }\n\n // ():int\n readEG() {\n const valu = this.readUEG(); // :int\n if (0x01 & valu) {\n // the number is odd if the low order bit is set\n return 1 + valu >>> 1; // add 1 to make it even, and divide by 2\n } else {\n return -1 * (valu >>> 1); // divide by two then make it negative\n }\n }\n\n // Some convenience functions\n // :Boolean\n readBoolean() {\n return this.readBits(1) === 1;\n }\n\n // ():int\n readUByte() {\n return this.readBits(8);\n }\n\n // ():int\n readUShort() {\n return this.readBits(16);\n }\n\n // ():int\n readUInt() {\n return this.readBits(32);\n }\n\n /**\n * Advance the ExpGolomb decoder past a scaling list. The scaling\n * list is optionally transmitted as part of a sequence parameter\n * set and is not relevant to transmuxing.\n * @param count the number of entries in this scaling list\n * @see Recommendation ITU-T H.264, Section 7.3.2.1.1.1\n */\n skipScalingList(count) {\n let lastScale = 8;\n let nextScale = 8;\n let deltaScale;\n for (let j = 0; j < count; j++) {\n if (nextScale !== 0) {\n deltaScale = this.readEG();\n nextScale = (lastScale + deltaScale + 256) % 256;\n }\n lastScale = nextScale === 0 ? lastScale : nextScale;\n }\n }\n\n /**\n * Read a sequence parameter set and return some interesting video\n * properties. A sequence parameter set is the H264 metadata that\n * describes the properties of upcoming video frames.\n * @returns an object with configuration parsed from the\n * sequence parameter set, including the dimensions of the\n * associated video frames.\n */\n readSPS() {\n let frameCropLeftOffset = 0;\n let frameCropRightOffset = 0;\n let frameCropTopOffset = 0;\n let frameCropBottomOffset = 0;\n let numRefFramesInPicOrderCntCycle;\n let scalingListCount;\n let i;\n const readUByte = this.readUByte.bind(this);\n const readBits = this.readBits.bind(this);\n const readUEG = this.readUEG.bind(this);\n const readBoolean = this.readBoolean.bind(this);\n const skipBits = this.skipBits.bind(this);\n const skipEG = this.skipEG.bind(this);\n const skipUEG = this.skipUEG.bind(this);\n const skipScalingList = this.skipScalingList.bind(this);\n readUByte();\n const profileIdc = readUByte(); // profile_idc\n readBits(5); // profileCompat constraint_set[0-4]_flag, u(5)\n skipBits(3); // reserved_zero_3bits u(3),\n readUByte(); // level_idc u(8)\n skipUEG(); // seq_parameter_set_id\n // some profiles have more optional data we don't need\n if (profileIdc === 100 || profileIdc === 110 || profileIdc === 122 || profileIdc === 244 || profileIdc === 44 || profileIdc === 83 || profileIdc === 86 || profileIdc === 118 || profileIdc === 128) {\n const chromaFormatIdc = readUEG();\n if (chromaFormatIdc === 3) {\n skipBits(1);\n } // separate_colour_plane_flag\n\n skipUEG(); // bit_depth_luma_minus8\n skipUEG(); // bit_depth_chroma_minus8\n skipBits(1); // qpprime_y_zero_transform_bypass_flag\n if (readBoolean()) {\n // seq_scaling_matrix_present_flag\n scalingListCount = chromaFormatIdc !== 3 ? 8 : 12;\n for (i = 0; i < scalingListCount; i++) {\n if (readBoolean()) {\n // seq_scaling_list_present_flag[ i ]\n if (i < 6) {\n skipScalingList(16);\n } else {\n skipScalingList(64);\n }\n }\n }\n }\n }\n skipUEG(); // log2_max_frame_num_minus4\n const picOrderCntType = readUEG();\n if (picOrderCntType === 0) {\n readUEG(); // log2_max_pic_order_cnt_lsb_minus4\n } else if (picOrderCntType === 1) {\n skipBits(1); // delta_pic_order_always_zero_flag\n skipEG(); // offset_for_non_ref_pic\n skipEG(); // offset_for_top_to_bottom_field\n numRefFramesInPicOrderCntCycle = readUEG();\n for (i = 0; i < numRefFramesInPicOrderCntCycle; i++) {\n skipEG();\n } // offset_for_ref_frame[ i ]\n }\n skipUEG(); // max_num_ref_frames\n skipBits(1); // gaps_in_frame_num_value_allowed_flag\n const picWidthInMbsMinus1 = readUEG();\n const picHeightInMapUnitsMinus1 = readUEG();\n const frameMbsOnlyFlag = readBits(1);\n if (frameMbsOnlyFlag === 0) {\n skipBits(1);\n } // mb_adaptive_frame_field_flag\n\n skipBits(1); // direct_8x8_inference_flag\n if (readBoolean()) {\n // frame_cropping_flag\n frameCropLeftOffset = readUEG();\n frameCropRightOffset = readUEG();\n frameCropTopOffset = readUEG();\n frameCropBottomOffset = readUEG();\n }\n let pixelRatio = [1, 1];\n if (readBoolean()) {\n // vui_parameters_present_flag\n if (readBoolean()) {\n // aspect_ratio_info_present_flag\n const aspectRatioIdc = readUByte();\n switch (aspectRatioIdc) {\n case 1:\n pixelRatio = [1, 1];\n break;\n case 2:\n pixelRatio = [12, 11];\n break;\n case 3:\n pixelRatio = [10, 11];\n break;\n case 4:\n pixelRatio = [16, 11];\n break;\n case 5:\n pixelRatio = [40, 33];\n break;\n case 6:\n pixelRatio = [24, 11];\n break;\n case 7:\n pixelRatio = [20, 11];\n break;\n case 8:\n pixelRatio = [32, 11];\n break;\n case 9:\n pixelRatio = [80, 33];\n break;\n case 10:\n pixelRatio = [18, 11];\n break;\n case 11:\n pixelRatio = [15, 11];\n break;\n case 12:\n pixelRatio = [64, 33];\n break;\n case 13:\n pixelRatio = [160, 99];\n break;\n case 14:\n pixelRatio = [4, 3];\n break;\n case 15:\n pixelRatio = [3, 2];\n break;\n case 16:\n pixelRatio = [2, 1];\n break;\n case 255:\n {\n pixelRatio = [readUByte() << 8 | readUByte(), readUByte() << 8 | readUByte()];\n break;\n }\n }\n }\n }\n return {\n width: Math.ceil((picWidthInMbsMinus1 + 1) * 16 - frameCropLeftOffset * 2 - frameCropRightOffset * 2),\n height: (2 - frameMbsOnlyFlag) * (picHeightInMapUnitsMinus1 + 1) * 16 - (frameMbsOnlyFlag ? 2 : 4) * (frameCropTopOffset + frameCropBottomOffset),\n pixelRatio: pixelRatio\n };\n }\n readSliceType() {\n // skip NALu type\n this.readUByte();\n // discard first_mb_in_slice\n this.readUEG();\n // return slice_type\n return this.readUEG();\n }\n}\n\nclass AvcVideoParser extends BaseVideoParser {\n parseAVCPES(track, textTrack, pes, last, duration) {\n const units = this.parseAVCNALu(track, pes.data);\n let VideoSample = this.VideoSample;\n let push;\n let spsfound = false;\n // free pes.data to save up some memory\n pes.data = null;\n\n // if new NAL units found and last sample still there, let's push ...\n // this helps parsing streams with missing AUD (only do this if AUD never found)\n if (VideoSample && units.length && !track.audFound) {\n this.pushAccessUnit(VideoSample, track);\n VideoSample = this.VideoSample = this.createVideoSample(false, pes.pts, pes.dts, '');\n }\n units.forEach(unit => {\n var _VideoSample2;\n switch (unit.type) {\n // NDR\n case 1:\n {\n let iskey = false;\n push = true;\n const data = unit.data;\n // only check slice type to detect KF in case SPS found in same packet (any keyframe is preceded by SPS ...)\n if (spsfound && data.length > 4) {\n // retrieve slice type by parsing beginning of NAL unit (follow H264 spec, slice_header definition) to detect keyframe embedded in NDR\n const sliceType = new ExpGolomb(data).readSliceType();\n // 2 : I slice, 4 : SI slice, 7 : I slice, 9: SI slice\n // SI slice : A slice that is coded using intra prediction only and using quantisation of the prediction samples.\n // An SI slice can be coded such that its decoded samples can be constructed identically to an SP slice.\n // I slice: A slice that is not an SI slice that is decoded using intra prediction only.\n // if (sliceType === 2 || sliceType === 7) {\n if (sliceType === 2 || sliceType === 4 || sliceType === 7 || sliceType === 9) {\n iskey = true;\n }\n }\n if (iskey) {\n var _VideoSample;\n // if we have non-keyframe data already, that cannot belong to the same frame as a keyframe, so force a push\n if ((_VideoSample = VideoSample) != null && _VideoSample.frame && !VideoSample.key) {\n this.pushAccessUnit(VideoSample, track);\n VideoSample = this.VideoSample = null;\n }\n }\n if (!VideoSample) {\n VideoSample = this.VideoSample = this.createVideoSample(true, pes.pts, pes.dts, '');\n }\n VideoSample.frame = true;\n VideoSample.key = iskey;\n break;\n // IDR\n }\n case 5:\n push = true;\n // handle PES not starting with AUD\n // if we have frame data already, that cannot belong to the same frame, so force a push\n if ((_VideoSample2 = VideoSample) != null && _VideoSample2.frame && !VideoSample.key) {\n this.pushAccessUnit(VideoSample, track);\n VideoSample = this.VideoSample = null;\n }\n if (!VideoSample) {\n VideoSample = this.VideoSample = this.createVideoSample(true, pes.pts, pes.dts, '');\n }\n VideoSample.key = true;\n VideoSample.frame = true;\n break;\n // SEI\n case 6:\n {\n push = true;\n parseSEIMessageFromNALu(unit.data, 1, pes.pts, textTrack.samples);\n break;\n // SPS\n }\n case 7:\n {\n var _track$pixelRatio, _track$pixelRatio2;\n push = true;\n spsfound = true;\n const sps = unit.data;\n const expGolombDecoder = new ExpGolomb(sps);\n const config = expGolombDecoder.readSPS();\n if (!track.sps || track.width !== config.width || track.height !== config.height || ((_track$pixelRatio = track.pixelRatio) == null ? void 0 : _track$pixelRatio[0]) !== config.pixelRatio[0] || ((_track$pixelRatio2 = track.pixelRatio) == null ? void 0 : _track$pixelRatio2[1]) !== config.pixelRatio[1]) {\n track.width = config.width;\n track.height = config.height;\n track.pixelRatio = config.pixelRatio;\n track.sps = [sps];\n track.duration = duration;\n const codecarray = sps.subarray(1, 4);\n let codecstring = 'avc1.';\n for (let i = 0; i < 3; i++) {\n let h = codecarray[i].toString(16);\n if (h.length < 2) {\n h = '0' + h;\n }\n codecstring += h;\n }\n track.codec = codecstring;\n }\n break;\n }\n // PPS\n case 8:\n push = true;\n track.pps = [unit.data];\n break;\n // AUD\n case 9:\n push = true;\n track.audFound = true;\n if (VideoSample) {\n this.pushAccessUnit(VideoSample, track);\n }\n VideoSample = this.VideoSample = this.createVideoSample(false, pes.pts, pes.dts, '');\n break;\n // Filler Data\n case 12:\n push = true;\n break;\n default:\n push = false;\n if (VideoSample) {\n VideoSample.debug += 'unknown NAL ' + unit.type + ' ';\n }\n break;\n }\n if (VideoSample && push) {\n const units = VideoSample.units;\n units.push(unit);\n }\n });\n // if last PES packet, push samples\n if (last && VideoSample) {\n this.pushAccessUnit(VideoSample, track);\n this.VideoSample = null;\n }\n }\n parseAVCNALu(track, array) {\n const len = array.byteLength;\n let state = track.naluState || 0;\n const lastState = state;\n const units = [];\n let i = 0;\n let value;\n let overflow;\n let unitType;\n let lastUnitStart = -1;\n let lastUnitType = 0;\n // logger.log('PES:' + Hex.hexDump(array));\n\n if (state === -1) {\n // special use case where we found 3 or 4-byte start codes exactly at the end of previous PES packet\n lastUnitStart = 0;\n // NALu type is value read from offset 0\n lastUnitType = array[0] & 0x1f;\n state = 0;\n i = 1;\n }\n while (i < len) {\n value = array[i++];\n // optimization. state 0 and 1 are the predominant case. let's handle them outside of the switch/case\n if (!state) {\n state = value ? 0 : 1;\n continue;\n }\n if (state === 1) {\n state = value ? 0 : 2;\n continue;\n }\n // here we have state either equal to 2 or 3\n if (!value) {\n state = 3;\n } else if (value === 1) {\n overflow = i - state - 1;\n if (lastUnitStart >= 0) {\n const unit = {\n data: array.subarray(lastUnitStart, overflow),\n type: lastUnitType\n };\n // logger.log('pushing NALU, type/size:' + unit.type + '/' + unit.data.byteLength);\n units.push(unit);\n } else {\n // lastUnitStart is undefined => this is the first start code found in this PES packet\n // first check if start code delimiter is overlapping between 2 PES packets,\n // ie it started in last packet (lastState not zero)\n // and ended at the beginning of this PES packet (i <= 4 - lastState)\n const lastUnit = this.getLastNalUnit(track.samples);\n if (lastUnit) {\n if (lastState && i <= 4 - lastState) {\n // start delimiter overlapping between PES packets\n // strip start delimiter bytes from the end of last NAL unit\n // check if lastUnit had a state different from zero\n if (lastUnit.state) {\n // strip last bytes\n lastUnit.data = lastUnit.data.subarray(0, lastUnit.data.byteLength - lastState);\n }\n }\n // If NAL units are not starting right at the beginning of the PES packet, push preceding data into previous NAL unit.\n\n if (overflow > 0) {\n // logger.log('first NALU found with overflow:' + overflow);\n lastUnit.data = appendUint8Array(lastUnit.data, array.subarray(0, overflow));\n lastUnit.state = 0;\n }\n }\n }\n // check if we can read unit type\n if (i < len) {\n unitType = array[i] & 0x1f;\n // logger.log('find NALU @ offset:' + i + ',type:' + unitType);\n lastUnitStart = i;\n lastUnitType = unitType;\n state = 0;\n } else {\n // not enough byte to read unit type. let's read it on next PES parsing\n state = -1;\n }\n } else {\n state = 0;\n }\n }\n if (lastUnitStart >= 0 && state >= 0) {\n const unit = {\n data: array.subarray(lastUnitStart, len),\n type: lastUnitType,\n state: state\n };\n units.push(unit);\n // logger.log('pushing NALU, type/size/state:' + unit.type + '/' + unit.data.byteLength + '/' + state);\n }\n // no NALu found\n if (units.length === 0) {\n // append pes.data to previous NAL unit\n const lastUnit = this.getLastNalUnit(track.samples);\n if (lastUnit) {\n lastUnit.data = appendUint8Array(lastUnit.data, array);\n }\n }\n track.naluState = state;\n return units;\n }\n}\n\n/**\n * SAMPLE-AES decrypter\n */\n\nclass SampleAesDecrypter {\n constructor(observer, config, keyData) {\n this.keyData = void 0;\n this.decrypter = void 0;\n this.keyData = keyData;\n this.decrypter = new Decrypter(config, {\n removePKCS7Padding: false\n });\n }\n decryptBuffer(encryptedData) {\n return this.decrypter.decrypt(encryptedData, this.keyData.key.buffer, this.keyData.iv.buffer);\n }\n\n // AAC - encrypt all full 16 bytes blocks starting from offset 16\n decryptAacSample(samples, sampleIndex, callback) {\n const curUnit = samples[sampleIndex].unit;\n if (curUnit.length <= 16) {\n // No encrypted portion in this sample (first 16 bytes is not\n // encrypted, see https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/HLS_Sample_Encryption/Encryption/Encryption.html),\n return;\n }\n const encryptedData = curUnit.subarray(16, curUnit.length - curUnit.length % 16);\n const encryptedBuffer = encryptedData.buffer.slice(encryptedData.byteOffset, encryptedData.byteOffset + encryptedData.length);\n this.decryptBuffer(encryptedBuffer).then(decryptedBuffer => {\n const decryptedData = new Uint8Array(decryptedBuffer);\n curUnit.set(decryptedData, 16);\n if (!this.decrypter.isSync()) {\n this.decryptAacSamples(samples, sampleIndex + 1, callback);\n }\n });\n }\n decryptAacSamples(samples, sampleIndex, callback) {\n for (;; sampleIndex++) {\n if (sampleIndex >= samples.length) {\n callback();\n return;\n }\n if (samples[sampleIndex].unit.length < 32) {\n continue;\n }\n this.decryptAacSample(samples, sampleIndex, callback);\n if (!this.decrypter.isSync()) {\n return;\n }\n }\n }\n\n // AVC - encrypt one 16 bytes block out of ten, starting from offset 32\n getAvcEncryptedData(decodedData) {\n const encryptedDataLen = Math.floor((decodedData.length - 48) / 160) * 16 + 16;\n const encryptedData = new Int8Array(encryptedDataLen);\n let outputPos = 0;\n for (let inputPos = 32; inputPos < decodedData.length - 16; inputPos += 160, outputPos += 16) {\n encryptedData.set(decodedData.subarray(inputPos, inputPos + 16), outputPos);\n }\n return encryptedData;\n }\n getAvcDecryptedUnit(decodedData, decryptedData) {\n const uint8DecryptedData = new Uint8Array(decryptedData);\n let inputPos = 0;\n for (let outputPos = 32; outputPos < decodedData.length - 16; outputPos += 160, inputPos += 16) {\n decodedData.set(uint8DecryptedData.subarray(inputPos, inputPos + 16), outputPos);\n }\n return decodedData;\n }\n decryptAvcSample(samples, sampleIndex, unitIndex, callback, curUnit) {\n const decodedData = discardEPB(curUnit.data);\n const encryptedData = this.getAvcEncryptedData(decodedData);\n this.decryptBuffer(encryptedData.buffer).then(decryptedBuffer => {\n curUnit.data = this.getAvcDecryptedUnit(decodedData, decryptedBuffer);\n if (!this.decrypter.isSync()) {\n this.decryptAvcSamples(samples, sampleIndex, unitIndex + 1, callback);\n }\n });\n }\n decryptAvcSamples(samples, sampleIndex, unitIndex, callback) {\n if (samples instanceof Uint8Array) {\n throw new Error('Cannot decrypt samples of type Uint8Array');\n }\n for (;; sampleIndex++, unitIndex = 0) {\n if (sampleIndex >= samples.length) {\n callback();\n return;\n }\n const curUnits = samples[sampleIndex].units;\n for (;; unitIndex++) {\n if (unitIndex >= curUnits.length) {\n break;\n }\n const curUnit = curUnits[unitIndex];\n if (curUnit.data.length <= 48 || curUnit.type !== 1 && curUnit.type !== 5) {\n continue;\n }\n this.decryptAvcSample(samples, sampleIndex, unitIndex, callback, curUnit);\n if (!this.decrypter.isSync()) {\n return;\n }\n }\n }\n }\n}\n\nconst PACKET_LENGTH = 188;\nclass TSDemuxer {\n constructor(observer, config, typeSupported) {\n this.observer = void 0;\n this.config = void 0;\n this.typeSupported = void 0;\n this.sampleAes = null;\n this.pmtParsed = false;\n this.audioCodec = void 0;\n this.videoCodec = void 0;\n this._duration = 0;\n this._pmtId = -1;\n this._videoTrack = void 0;\n this._audioTrack = void 0;\n this._id3Track = void 0;\n this._txtTrack = void 0;\n this.aacOverFlow = null;\n this.remainderData = null;\n this.videoParser = void 0;\n this.observer = observer;\n this.config = config;\n this.typeSupported = typeSupported;\n this.videoParser = new AvcVideoParser();\n }\n static probe(data) {\n const syncOffset = TSDemuxer.syncOffset(data);\n if (syncOffset > 0) {\n logger.warn(`MPEG2-TS detected but first sync word found @ offset ${syncOffset}`);\n }\n return syncOffset !== -1;\n }\n static syncOffset(data) {\n const length = data.length;\n let scanwindow = Math.min(PACKET_LENGTH * 5, length - PACKET_LENGTH) + 1;\n let i = 0;\n while (i < scanwindow) {\n // a TS init segment should contain at least 2 TS packets: PAT and PMT, each starting with 0x47\n let foundPat = false;\n let packetStart = -1;\n let tsPackets = 0;\n for (let j = i; j < length; j += PACKET_LENGTH) {\n if (data[j] === 0x47 && (length - j === PACKET_LENGTH || data[j + PACKET_LENGTH] === 0x47)) {\n tsPackets++;\n if (packetStart === -1) {\n packetStart = j;\n // First sync word found at offset, increase scan length (#5251)\n if (packetStart !== 0) {\n scanwindow = Math.min(packetStart + PACKET_LENGTH * 99, data.length - PACKET_LENGTH) + 1;\n }\n }\n if (!foundPat) {\n foundPat = parsePID(data, j) === 0;\n }\n // Sync word found at 0 with 3 packets, or found at offset least 2 packets up to scanwindow (#5501)\n if (foundPat && tsPackets > 1 && (packetStart === 0 && tsPackets > 2 || j + PACKET_LENGTH > scanwindow)) {\n return packetStart;\n }\n } else if (tsPackets) {\n // Exit if sync word found, but does not contain contiguous packets\n return -1;\n } else {\n break;\n }\n }\n i++;\n }\n return -1;\n }\n\n /**\n * Creates a track model internal to demuxer used to drive remuxing input\n */\n static createTrack(type, duration) {\n return {\n container: type === 'video' || type === 'audio' ? 'video/mp2t' : undefined,\n type,\n id: RemuxerTrackIdConfig[type],\n pid: -1,\n inputTimeScale: 90000,\n sequenceNumber: 0,\n samples: [],\n dropped: 0,\n duration: type === 'audio' ? duration : undefined\n };\n }\n\n /**\n * Initializes a new init segment on the demuxer/remuxer interface. Needed for discontinuities/track-switches (or at stream start)\n * Resets all internal track instances of the demuxer.\n */\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n this.pmtParsed = false;\n this._pmtId = -1;\n this._videoTrack = TSDemuxer.createTrack('video');\n this._audioTrack = TSDemuxer.createTrack('audio', trackDuration);\n this._id3Track = TSDemuxer.createTrack('id3');\n this._txtTrack = TSDemuxer.createTrack('text');\n this._audioTrack.segmentCodec = 'aac';\n\n // flush any partial content\n this.aacOverFlow = null;\n this.remainderData = null;\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this._duration = trackDuration;\n }\n resetTimeStamp() {}\n resetContiguity() {\n const {\n _audioTrack,\n _videoTrack,\n _id3Track\n } = this;\n if (_audioTrack) {\n _audioTrack.pesData = null;\n }\n if (_videoTrack) {\n _videoTrack.pesData = null;\n }\n if (_id3Track) {\n _id3Track.pesData = null;\n }\n this.aacOverFlow = null;\n this.remainderData = null;\n }\n demux(data, timeOffset, isSampleAes = false, flush = false) {\n if (!isSampleAes) {\n this.sampleAes = null;\n }\n let pes;\n const videoTrack = this._videoTrack;\n const audioTrack = this._audioTrack;\n const id3Track = this._id3Track;\n const textTrack = this._txtTrack;\n let videoPid = videoTrack.pid;\n let videoData = videoTrack.pesData;\n let audioPid = audioTrack.pid;\n let id3Pid = id3Track.pid;\n let audioData = audioTrack.pesData;\n let id3Data = id3Track.pesData;\n let unknownPID = null;\n let pmtParsed = this.pmtParsed;\n let pmtId = this._pmtId;\n let len = data.length;\n if (this.remainderData) {\n data = appendUint8Array(this.remainderData, data);\n len = data.length;\n this.remainderData = null;\n }\n if (len < PACKET_LENGTH && !flush) {\n this.remainderData = data;\n return {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack\n };\n }\n const syncOffset = Math.max(0, TSDemuxer.syncOffset(data));\n len -= (len - syncOffset) % PACKET_LENGTH;\n if (len < data.byteLength && !flush) {\n this.remainderData = new Uint8Array(data.buffer, len, data.buffer.byteLength - len);\n }\n\n // loop through TS packets\n let tsPacketErrors = 0;\n for (let start = syncOffset; start < len; start += PACKET_LENGTH) {\n if (data[start] === 0x47) {\n const stt = !!(data[start + 1] & 0x40);\n const pid = parsePID(data, start);\n const atf = (data[start + 3] & 0x30) >> 4;\n\n // if an adaption field is present, its length is specified by the fifth byte of the TS packet header.\n let offset;\n if (atf > 1) {\n offset = start + 5 + data[start + 4];\n // continue if there is only adaptation field\n if (offset === start + PACKET_LENGTH) {\n continue;\n }\n } else {\n offset = start + 4;\n }\n switch (pid) {\n case videoPid:\n if (stt) {\n if (videoData && (pes = parsePES(videoData))) {\n this.videoParser.parseAVCPES(videoTrack, textTrack, pes, false, this._duration);\n }\n videoData = {\n data: [],\n size: 0\n };\n }\n if (videoData) {\n videoData.data.push(data.subarray(offset, start + PACKET_LENGTH));\n videoData.size += start + PACKET_LENGTH - offset;\n }\n break;\n case audioPid:\n if (stt) {\n if (audioData && (pes = parsePES(audioData))) {\n switch (audioTrack.segmentCodec) {\n case 'aac':\n this.parseAACPES(audioTrack, pes);\n break;\n case 'mp3':\n this.parseMPEGPES(audioTrack, pes);\n break;\n case 'ac3':\n {\n this.parseAC3PES(audioTrack, pes);\n }\n break;\n }\n }\n audioData = {\n data: [],\n size: 0\n };\n }\n if (audioData) {\n audioData.data.push(data.subarray(offset, start + PACKET_LENGTH));\n audioData.size += start + PACKET_LENGTH - offset;\n }\n break;\n case id3Pid:\n if (stt) {\n if (id3Data && (pes = parsePES(id3Data))) {\n this.parseID3PES(id3Track, pes);\n }\n id3Data = {\n data: [],\n size: 0\n };\n }\n if (id3Data) {\n id3Data.data.push(data.subarray(offset, start + PACKET_LENGTH));\n id3Data.size += start + PACKET_LENGTH - offset;\n }\n break;\n case 0:\n if (stt) {\n offset += data[offset] + 1;\n }\n pmtId = this._pmtId = parsePAT(data, offset);\n // logger.log('PMT PID:' + this._pmtId);\n break;\n case pmtId:\n {\n if (stt) {\n offset += data[offset] + 1;\n }\n const parsedPIDs = parsePMT(data, offset, this.typeSupported, isSampleAes, this.observer);\n\n // only update track id if track PID found while parsing PMT\n // this is to avoid resetting the PID to -1 in case\n // track PID transiently disappears from the stream\n // this could happen in case of transient missing audio samples for example\n // NOTE this is only the PID of the track as found in TS,\n // but we are not using this for MP4 track IDs.\n videoPid = parsedPIDs.videoPid;\n if (videoPid > 0) {\n videoTrack.pid = videoPid;\n videoTrack.segmentCodec = parsedPIDs.segmentVideoCodec;\n }\n audioPid = parsedPIDs.audioPid;\n if (audioPid > 0) {\n audioTrack.pid = audioPid;\n audioTrack.segmentCodec = parsedPIDs.segmentAudioCodec;\n }\n id3Pid = parsedPIDs.id3Pid;\n if (id3Pid > 0) {\n id3Track.pid = id3Pid;\n }\n if (unknownPID !== null && !pmtParsed) {\n logger.warn(`MPEG-TS PMT found at ${start} after unknown PID '${unknownPID}'. Backtracking to sync byte @${syncOffset} to parse all TS packets.`);\n unknownPID = null;\n // we set it to -188, the += 188 in the for loop will reset start to 0\n start = syncOffset - 188;\n }\n pmtParsed = this.pmtParsed = true;\n break;\n }\n case 0x11:\n case 0x1fff:\n break;\n default:\n unknownPID = pid;\n break;\n }\n } else {\n tsPacketErrors++;\n }\n }\n if (tsPacketErrors > 0) {\n emitParsingError(this.observer, new Error(`Found ${tsPacketErrors} TS packet/s that do not start with 0x47`));\n }\n videoTrack.pesData = videoData;\n audioTrack.pesData = audioData;\n id3Track.pesData = id3Data;\n const demuxResult = {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack\n };\n if (flush) {\n this.extractRemainingSamples(demuxResult);\n }\n return demuxResult;\n }\n flush() {\n const {\n remainderData\n } = this;\n this.remainderData = null;\n let result;\n if (remainderData) {\n result = this.demux(remainderData, -1, false, true);\n } else {\n result = {\n videoTrack: this._videoTrack,\n audioTrack: this._audioTrack,\n id3Track: this._id3Track,\n textTrack: this._txtTrack\n };\n }\n this.extractRemainingSamples(result);\n if (this.sampleAes) {\n return this.decrypt(result, this.sampleAes);\n }\n return result;\n }\n extractRemainingSamples(demuxResult) {\n const {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack\n } = demuxResult;\n const videoData = videoTrack.pesData;\n const audioData = audioTrack.pesData;\n const id3Data = id3Track.pesData;\n // try to parse last PES packets\n let pes;\n if (videoData && (pes = parsePES(videoData))) {\n this.videoParser.parseAVCPES(videoTrack, textTrack, pes, true, this._duration);\n videoTrack.pesData = null;\n } else {\n // either avcData null or PES truncated, keep it for next frag parsing\n videoTrack.pesData = videoData;\n }\n if (audioData && (pes = parsePES(audioData))) {\n switch (audioTrack.segmentCodec) {\n case 'aac':\n this.parseAACPES(audioTrack, pes);\n break;\n case 'mp3':\n this.parseMPEGPES(audioTrack, pes);\n break;\n case 'ac3':\n {\n this.parseAC3PES(audioTrack, pes);\n }\n break;\n }\n audioTrack.pesData = null;\n } else {\n if (audioData != null && audioData.size) {\n logger.log('last AAC PES packet truncated,might overlap between fragments');\n }\n\n // either audioData null or PES truncated, keep it for next frag parsing\n audioTrack.pesData = audioData;\n }\n if (id3Data && (pes = parsePES(id3Data))) {\n this.parseID3PES(id3Track, pes);\n id3Track.pesData = null;\n } else {\n // either id3Data null or PES truncated, keep it for next frag parsing\n id3Track.pesData = id3Data;\n }\n }\n demuxSampleAes(data, keyData, timeOffset) {\n const demuxResult = this.demux(data, timeOffset, true, !this.config.progressive);\n const sampleAes = this.sampleAes = new SampleAesDecrypter(this.observer, this.config, keyData);\n return this.decrypt(demuxResult, sampleAes);\n }\n decrypt(demuxResult, sampleAes) {\n return new Promise(resolve => {\n const {\n audioTrack,\n videoTrack\n } = demuxResult;\n if (audioTrack.samples && audioTrack.segmentCodec === 'aac') {\n sampleAes.decryptAacSamples(audioTrack.samples, 0, () => {\n if (videoTrack.samples) {\n sampleAes.decryptAvcSamples(videoTrack.samples, 0, 0, () => {\n resolve(demuxResult);\n });\n } else {\n resolve(demuxResult);\n }\n });\n } else if (videoTrack.samples) {\n sampleAes.decryptAvcSamples(videoTrack.samples, 0, 0, () => {\n resolve(demuxResult);\n });\n }\n });\n }\n destroy() {\n this._duration = 0;\n }\n parseAACPES(track, pes) {\n let startOffset = 0;\n const aacOverFlow = this.aacOverFlow;\n let data = pes.data;\n if (aacOverFlow) {\n this.aacOverFlow = null;\n const frameMissingBytes = aacOverFlow.missing;\n const sampleLength = aacOverFlow.sample.unit.byteLength;\n // logger.log(`AAC: append overflowing ${sampleLength} bytes to beginning of new PES`);\n if (frameMissingBytes === -1) {\n data = appendUint8Array(aacOverFlow.sample.unit, data);\n } else {\n const frameOverflowBytes = sampleLength - frameMissingBytes;\n aacOverFlow.sample.unit.set(data.subarray(0, frameMissingBytes), frameOverflowBytes);\n track.samples.push(aacOverFlow.sample);\n startOffset = aacOverFlow.missing;\n }\n }\n // look for ADTS header (0xFFFx)\n let offset;\n let len;\n for (offset = startOffset, len = data.length; offset < len - 1; offset++) {\n if (isHeader$1(data, offset)) {\n break;\n }\n }\n // if ADTS header does not start straight from the beginning of the PES payload, raise an error\n if (offset !== startOffset) {\n let reason;\n const recoverable = offset < len - 1;\n if (recoverable) {\n reason = `AAC PES did not start with ADTS header,offset:${offset}`;\n } else {\n reason = 'No ADTS header found in AAC PES';\n }\n emitParsingError(this.observer, new Error(reason), recoverable);\n if (!recoverable) {\n return;\n }\n }\n initTrackConfig(track, this.observer, data, offset, this.audioCodec);\n let pts;\n if (pes.pts !== undefined) {\n pts = pes.pts;\n } else if (aacOverFlow) {\n // if last AAC frame is overflowing, we should ensure timestamps are contiguous:\n // first sample PTS should be equal to last sample PTS + frameDuration\n const frameDuration = getFrameDuration(track.samplerate);\n pts = aacOverFlow.sample.pts + frameDuration;\n } else {\n logger.warn('[tsdemuxer]: AAC PES unknown PTS');\n return;\n }\n\n // scan for aac samples\n let frameIndex = 0;\n let frame;\n while (offset < len) {\n frame = appendFrame$2(track, data, offset, pts, frameIndex);\n offset += frame.length;\n if (!frame.missing) {\n frameIndex++;\n for (; offset < len - 1; offset++) {\n if (isHeader$1(data, offset)) {\n break;\n }\n }\n } else {\n this.aacOverFlow = frame;\n break;\n }\n }\n }\n parseMPEGPES(track, pes) {\n const data = pes.data;\n const length = data.length;\n let frameIndex = 0;\n let offset = 0;\n const pts = pes.pts;\n if (pts === undefined) {\n logger.warn('[tsdemuxer]: MPEG PES unknown PTS');\n return;\n }\n while (offset < length) {\n if (isHeader(data, offset)) {\n const frame = appendFrame$1(track, data, offset, pts, frameIndex);\n if (frame) {\n offset += frame.length;\n frameIndex++;\n } else {\n // logger.log('Unable to parse Mpeg audio frame');\n break;\n }\n } else {\n // nothing found, keep looking\n offset++;\n }\n }\n }\n parseAC3PES(track, pes) {\n {\n const data = pes.data;\n const pts = pes.pts;\n if (pts === undefined) {\n logger.warn('[tsdemuxer]: AC3 PES unknown PTS');\n return;\n }\n const length = data.length;\n let frameIndex = 0;\n let offset = 0;\n let parsed;\n while (offset < length && (parsed = appendFrame(track, data, offset, pts, frameIndex++)) > 0) {\n offset += parsed;\n }\n }\n }\n parseID3PES(id3Track, pes) {\n if (pes.pts === undefined) {\n logger.warn('[tsdemuxer]: ID3 PES unknown PTS');\n return;\n }\n const id3Sample = _extends({}, pes, {\n type: this._videoTrack ? MetadataSchema.emsg : MetadataSchema.audioId3,\n duration: Number.POSITIVE_INFINITY\n });\n id3Track.samples.push(id3Sample);\n }\n}\nfunction parsePID(data, offset) {\n // pid is a 13-bit field starting at the last bit of TS[1]\n return ((data[offset + 1] & 0x1f) << 8) + data[offset + 2];\n}\nfunction parsePAT(data, offset) {\n // skip the PSI header and parse the first PMT entry\n return (data[offset + 10] & 0x1f) << 8 | data[offset + 11];\n}\nfunction parsePMT(data, offset, typeSupported, isSampleAes, observer) {\n const result = {\n audioPid: -1,\n videoPid: -1,\n id3Pid: -1,\n segmentVideoCodec: 'avc',\n segmentAudioCodec: 'aac'\n };\n const sectionLength = (data[offset + 1] & 0x0f) << 8 | data[offset + 2];\n const tableEnd = offset + 3 + sectionLength - 4;\n // to determine where the table is, we have to figure out how\n // long the program info descriptors are\n const programInfoLength = (data[offset + 10] & 0x0f) << 8 | data[offset + 11];\n // advance the offset to the first entry in the mapping table\n offset += 12 + programInfoLength;\n while (offset < tableEnd) {\n const pid = parsePID(data, offset);\n const esInfoLength = (data[offset + 3] & 0x0f) << 8 | data[offset + 4];\n switch (data[offset]) {\n case 0xcf:\n // SAMPLE-AES AAC\n if (!isSampleAes) {\n logEncryptedSamplesFoundInUnencryptedStream('ADTS AAC');\n break;\n }\n /* falls through */\n case 0x0f:\n // ISO/IEC 13818-7 ADTS AAC (MPEG-2 lower bit-rate audio)\n // logger.log('AAC PID:' + pid);\n if (result.audioPid === -1) {\n result.audioPid = pid;\n }\n break;\n\n // Packetized metadata (ID3)\n case 0x15:\n // logger.log('ID3 PID:' + pid);\n if (result.id3Pid === -1) {\n result.id3Pid = pid;\n }\n break;\n case 0xdb:\n // SAMPLE-AES AVC\n if (!isSampleAes) {\n logEncryptedSamplesFoundInUnencryptedStream('H.264');\n break;\n }\n /* falls through */\n case 0x1b:\n // ITU-T Rec. H.264 and ISO/IEC 14496-10 (lower bit-rate video)\n // logger.log('AVC PID:' + pid);\n if (result.videoPid === -1) {\n result.videoPid = pid;\n result.segmentVideoCodec = 'avc';\n }\n break;\n\n // ISO/IEC 11172-3 (MPEG-1 audio)\n // or ISO/IEC 13818-3 (MPEG-2 halved sample rate audio)\n case 0x03:\n case 0x04:\n // logger.log('MPEG PID:' + pid);\n if (!typeSupported.mpeg && !typeSupported.mp3) {\n logger.log('MPEG audio found, not supported in this browser');\n } else if (result.audioPid === -1) {\n result.audioPid = pid;\n result.segmentAudioCodec = 'mp3';\n }\n break;\n case 0xc1:\n // SAMPLE-AES AC3\n if (!isSampleAes) {\n logEncryptedSamplesFoundInUnencryptedStream('AC-3');\n break;\n }\n /* falls through */\n case 0x81:\n {\n if (!typeSupported.ac3) {\n logger.log('AC-3 audio found, not supported in this browser');\n } else if (result.audioPid === -1) {\n result.audioPid = pid;\n result.segmentAudioCodec = 'ac3';\n }\n }\n break;\n case 0x06:\n // stream_type 6 can mean a lot of different things in case of DVB.\n // We need to look at the descriptors. Right now, we're only interested\n // in AC-3 audio, so we do the descriptor parsing only when we don't have\n // an audio PID yet.\n if (result.audioPid === -1 && esInfoLength > 0) {\n let parsePos = offset + 5;\n let remaining = esInfoLength;\n while (remaining > 2) {\n const descriptorId = data[parsePos];\n switch (descriptorId) {\n case 0x6a:\n // DVB Descriptor for AC-3\n {\n if (typeSupported.ac3 !== true) {\n logger.log('AC-3 audio found, not supported in this browser for now');\n } else {\n result.audioPid = pid;\n result.segmentAudioCodec = 'ac3';\n }\n }\n break;\n }\n const descriptorLen = data[parsePos + 1] + 2;\n parsePos += descriptorLen;\n remaining -= descriptorLen;\n }\n }\n break;\n case 0xc2: // SAMPLE-AES EC3\n /* falls through */\n case 0x87:\n emitParsingError(observer, new Error('Unsupported EC-3 in M2TS found'));\n return result;\n case 0x24:\n emitParsingError(observer, new Error('Unsupported HEVC in M2TS found'));\n return result;\n }\n // move to the next table entry\n // skip past the elementary stream descriptors, if present\n offset += esInfoLength + 5;\n }\n return result;\n}\nfunction emitParsingError(observer, error, levelRetry) {\n logger.warn(`parsing error: ${error.message}`);\n observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: false,\n levelRetry,\n error,\n reason: error.message\n });\n}\nfunction logEncryptedSamplesFoundInUnencryptedStream(type) {\n logger.log(`${type} with AES-128-CBC encryption found in unencrypted stream`);\n}\nfunction parsePES(stream) {\n let i = 0;\n let frag;\n let pesLen;\n let pesHdrLen;\n let pesPts;\n let pesDts;\n const data = stream.data;\n // safety check\n if (!stream || stream.size === 0) {\n return null;\n }\n\n // we might need up to 19 bytes to read PES header\n // if first chunk of data is less than 19 bytes, let's merge it with following ones until we get 19 bytes\n // usually only one merge is needed (and this is rare ...)\n while (data[0].length < 19 && data.length > 1) {\n data[0] = appendUint8Array(data[0], data[1]);\n data.splice(1, 1);\n }\n // retrieve PTS/DTS from first fragment\n frag = data[0];\n const pesPrefix = (frag[0] << 16) + (frag[1] << 8) + frag[2];\n if (pesPrefix === 1) {\n pesLen = (frag[4] << 8) + frag[5];\n // if PES parsed length is not zero and greater than total received length, stop parsing. PES might be truncated\n // minus 6 : PES header size\n if (pesLen && pesLen > stream.size - 6) {\n return null;\n }\n const pesFlags = frag[7];\n if (pesFlags & 0xc0) {\n /* PES header described here : http://dvd.sourceforge.net/dvdinfo/pes-hdr.html\n as PTS / DTS is 33 bit we cannot use bitwise operator in JS,\n as Bitwise operators treat their operands as a sequence of 32 bits */\n pesPts = (frag[9] & 0x0e) * 536870912 +\n // 1 << 29\n (frag[10] & 0xff) * 4194304 +\n // 1 << 22\n (frag[11] & 0xfe) * 16384 +\n // 1 << 14\n (frag[12] & 0xff) * 128 +\n // 1 << 7\n (frag[13] & 0xfe) / 2;\n if (pesFlags & 0x40) {\n pesDts = (frag[14] & 0x0e) * 536870912 +\n // 1 << 29\n (frag[15] & 0xff) * 4194304 +\n // 1 << 22\n (frag[16] & 0xfe) * 16384 +\n // 1 << 14\n (frag[17] & 0xff) * 128 +\n // 1 << 7\n (frag[18] & 0xfe) / 2;\n if (pesPts - pesDts > 60 * 90000) {\n logger.warn(`${Math.round((pesPts - pesDts) / 90000)}s delta between PTS and DTS, align them`);\n pesPts = pesDts;\n }\n } else {\n pesDts = pesPts;\n }\n }\n pesHdrLen = frag[8];\n // 9 bytes : 6 bytes for PES header + 3 bytes for PES extension\n let payloadStartOffset = pesHdrLen + 9;\n if (stream.size <= payloadStartOffset) {\n return null;\n }\n stream.size -= payloadStartOffset;\n // reassemble PES packet\n const pesData = new Uint8Array(stream.size);\n for (let j = 0, dataLen = data.length; j < dataLen; j++) {\n frag = data[j];\n let len = frag.byteLength;\n if (payloadStartOffset) {\n if (payloadStartOffset > len) {\n // trim full frag if PES header bigger than frag\n payloadStartOffset -= len;\n continue;\n } else {\n // trim partial frag if PES header smaller than frag\n frag = frag.subarray(payloadStartOffset);\n len -= payloadStartOffset;\n payloadStartOffset = 0;\n }\n }\n pesData.set(frag, i);\n i += len;\n }\n if (pesLen) {\n // payload size : remove PES header + PES extension\n pesLen -= pesHdrLen + 3;\n }\n return {\n data: pesData,\n pts: pesPts,\n dts: pesDts,\n len: pesLen\n };\n }\n return null;\n}\n\n/**\n * MP3 demuxer\n */\nclass MP3Demuxer extends BaseAudioDemuxer {\n resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration) {\n super.resetInitSegment(initSegment, audioCodec, videoCodec, trackDuration);\n this._audioTrack = {\n container: 'audio/mpeg',\n type: 'audio',\n id: 2,\n pid: -1,\n sequenceNumber: 0,\n segmentCodec: 'mp3',\n samples: [],\n manifestCodec: audioCodec,\n duration: trackDuration,\n inputTimeScale: 90000,\n dropped: 0\n };\n }\n static probe(data) {\n if (!data) {\n return false;\n }\n\n // check if data contains ID3 timestamp and MPEG sync word\n // Look for MPEG header | 1111 1111 | 111X XYZX | where X can be either 0 or 1 and Y or Z should be 1\n // Layer bits (position 14 and 15) in header should be always different from 0 (Layer I or Layer II or Layer III)\n // More info http://www.mp3-tech.org/programmer/frame_header.html\n const id3Data = getID3Data(data, 0);\n let offset = (id3Data == null ? void 0 : id3Data.length) || 0;\n\n // Check for ac-3|ec-3 sync bytes and return false if present\n if (id3Data && data[offset] === 0x0b && data[offset + 1] === 0x77 && getTimeStamp(id3Data) !== undefined &&\n // check the bsid to confirm ac-3 or ec-3 (not mp3)\n getAudioBSID(data, offset) <= 16) {\n return false;\n }\n for (let length = data.length; offset < length; offset++) {\n if (probe(data, offset)) {\n logger.log('MPEG Audio sync word found !');\n return true;\n }\n }\n return false;\n }\n canParse(data, offset) {\n return canParse(data, offset);\n }\n appendFrame(track, data, offset) {\n if (this.basePTS === null) {\n return;\n }\n return appendFrame$1(track, data, offset, this.basePTS, this.frameIndex);\n }\n}\n\n/**\n * AAC helper\n */\n\nclass AAC {\n static getSilentFrame(codec, channelCount) {\n switch (codec) {\n case 'mp4a.40.2':\n if (channelCount === 1) {\n return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x23, 0x80]);\n } else if (channelCount === 2) {\n return new Uint8Array([0x21, 0x00, 0x49, 0x90, 0x02, 0x19, 0x00, 0x23, 0x80]);\n } else if (channelCount === 3) {\n return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x8e]);\n } else if (channelCount === 4) {\n return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x80, 0x2c, 0x80, 0x08, 0x02, 0x38]);\n } else if (channelCount === 5) {\n return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x38]);\n } else if (channelCount === 6) {\n return new Uint8Array([0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64, 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x00, 0xb2, 0x00, 0x20, 0x08, 0xe0]);\n }\n break;\n // handle HE-AAC below (mp4a.40.5 / mp4a.40.29)\n default:\n if (channelCount === 1) {\n // ffmpeg -y -f lavfi -i \"aevalsrc=0:d=0.05\" -c:a libfdk_aac -profile:a aac_he -b:a 4k output.aac && hexdump -v -e '16/1 \"0x%x,\" \"\\n\"' -v output.aac\n return new Uint8Array([0x1, 0x40, 0x22, 0x80, 0xa3, 0x4e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0, 0x0, 0x1c, 0x6, 0xf1, 0xc1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5e]);\n } else if (channelCount === 2) {\n // ffmpeg -y -f lavfi -i \"aevalsrc=0|0:d=0.05\" -c:a libfdk_aac -profile:a aac_he_v2 -b:a 4k output.aac && hexdump -v -e '16/1 \"0x%x,\" \"\\n\"' -v output.aac\n return new Uint8Array([0x1, 0x40, 0x22, 0x80, 0xa3, 0x5e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0, 0x0, 0x0, 0x95, 0x0, 0x6, 0xf1, 0xa1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5e]);\n } else if (channelCount === 3) {\n // ffmpeg -y -f lavfi -i \"aevalsrc=0|0|0:d=0.05\" -c:a libfdk_aac -profile:a aac_he_v2 -b:a 4k output.aac && hexdump -v -e '16/1 \"0x%x,\" \"\\n\"' -v output.aac\n return new Uint8Array([0x1, 0x40, 0x22, 0x80, 0xa3, 0x5e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0, 0x0, 0x0, 0x95, 0x0, 0x6, 0xf1, 0xa1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5e]);\n }\n break;\n }\n return undefined;\n }\n}\n\n/**\n * Generate MP4 Box\n */\n\nconst UINT32_MAX = Math.pow(2, 32) - 1;\nclass MP4 {\n static init() {\n MP4.types = {\n avc1: [],\n // codingname\n avcC: [],\n btrt: [],\n dinf: [],\n dref: [],\n esds: [],\n ftyp: [],\n hdlr: [],\n mdat: [],\n mdhd: [],\n mdia: [],\n mfhd: [],\n minf: [],\n moof: [],\n moov: [],\n mp4a: [],\n '.mp3': [],\n dac3: [],\n 'ac-3': [],\n mvex: [],\n mvhd: [],\n pasp: [],\n sdtp: [],\n stbl: [],\n stco: [],\n stsc: [],\n stsd: [],\n stsz: [],\n stts: [],\n tfdt: [],\n tfhd: [],\n traf: [],\n trak: [],\n trun: [],\n trex: [],\n tkhd: [],\n vmhd: [],\n smhd: []\n };\n let i;\n for (i in MP4.types) {\n if (MP4.types.hasOwnProperty(i)) {\n MP4.types[i] = [i.charCodeAt(0), i.charCodeAt(1), i.charCodeAt(2), i.charCodeAt(3)];\n }\n }\n const videoHdlr = new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00,\n // pre_defined\n 0x76, 0x69, 0x64, 0x65,\n // handler_type: 'vide'\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x56, 0x69, 0x64, 0x65, 0x6f, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'VideoHandler'\n ]);\n const audioHdlr = new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00,\n // pre_defined\n 0x73, 0x6f, 0x75, 0x6e,\n // handler_type: 'soun'\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x53, 0x6f, 0x75, 0x6e, 0x64, 0x48, 0x61, 0x6e, 0x64, 0x6c, 0x65, 0x72, 0x00 // name: 'SoundHandler'\n ]);\n MP4.HDLR_TYPES = {\n video: videoHdlr,\n audio: audioHdlr\n };\n const dref = new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x01,\n // entry_count\n 0x00, 0x00, 0x00, 0x0c,\n // entry_size\n 0x75, 0x72, 0x6c, 0x20,\n // 'url' type\n 0x00,\n // version 0\n 0x00, 0x00, 0x01 // entry_flags\n ]);\n const stco = new Uint8Array([0x00,\n // version\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00 // entry_count\n ]);\n MP4.STTS = MP4.STSC = MP4.STCO = stco;\n MP4.STSZ = new Uint8Array([0x00,\n // version\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00,\n // sample_size\n 0x00, 0x00, 0x00, 0x00 // sample_count\n ]);\n MP4.VMHD = new Uint8Array([0x00,\n // version\n 0x00, 0x00, 0x01,\n // flags\n 0x00, 0x00,\n // graphicsmode\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 // opcolor\n ]);\n MP4.SMHD = new Uint8Array([0x00,\n // version\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00,\n // balance\n 0x00, 0x00 // reserved\n ]);\n MP4.STSD = new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x01]); // entry_count\n\n const majorBrand = new Uint8Array([105, 115, 111, 109]); // isom\n const avc1Brand = new Uint8Array([97, 118, 99, 49]); // avc1\n const minorVersion = new Uint8Array([0, 0, 0, 1]);\n MP4.FTYP = MP4.box(MP4.types.ftyp, majorBrand, minorVersion, majorBrand, avc1Brand);\n MP4.DINF = MP4.box(MP4.types.dinf, MP4.box(MP4.types.dref, dref));\n }\n static box(type, ...payload) {\n let size = 8;\n let i = payload.length;\n const len = i;\n // calculate the total size we need to allocate\n while (i--) {\n size += payload[i].byteLength;\n }\n const result = new Uint8Array(size);\n result[0] = size >> 24 & 0xff;\n result[1] = size >> 16 & 0xff;\n result[2] = size >> 8 & 0xff;\n result[3] = size & 0xff;\n result.set(type, 4);\n // copy the payload into the result\n for (i = 0, size = 8; i < len; i++) {\n // copy payload[i] array @ offset size\n result.set(payload[i], size);\n size += payload[i].byteLength;\n }\n return result;\n }\n static hdlr(type) {\n return MP4.box(MP4.types.hdlr, MP4.HDLR_TYPES[type]);\n }\n static mdat(data) {\n return MP4.box(MP4.types.mdat, data);\n }\n static mdhd(timescale, duration) {\n duration *= timescale;\n const upperWordDuration = Math.floor(duration / (UINT32_MAX + 1));\n const lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));\n return MP4.box(MP4.types.mdhd, new Uint8Array([0x01,\n // version 1\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,\n // creation_time\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03,\n // modification_time\n timescale >> 24 & 0xff, timescale >> 16 & 0xff, timescale >> 8 & 0xff, timescale & 0xff,\n // timescale\n upperWordDuration >> 24, upperWordDuration >> 16 & 0xff, upperWordDuration >> 8 & 0xff, upperWordDuration & 0xff, lowerWordDuration >> 24, lowerWordDuration >> 16 & 0xff, lowerWordDuration >> 8 & 0xff, lowerWordDuration & 0xff, 0x55, 0xc4,\n // 'und' language (undetermined)\n 0x00, 0x00]));\n }\n static mdia(track) {\n return MP4.box(MP4.types.mdia, MP4.mdhd(track.timescale, track.duration), MP4.hdlr(track.type), MP4.minf(track));\n }\n static mfhd(sequenceNumber) {\n return MP4.box(MP4.types.mfhd, new Uint8Array([0x00, 0x00, 0x00, 0x00,\n // flags\n sequenceNumber >> 24, sequenceNumber >> 16 & 0xff, sequenceNumber >> 8 & 0xff, sequenceNumber & 0xff // sequence_number\n ]));\n }\n static minf(track) {\n if (track.type === 'audio') {\n return MP4.box(MP4.types.minf, MP4.box(MP4.types.smhd, MP4.SMHD), MP4.DINF, MP4.stbl(track));\n } else {\n return MP4.box(MP4.types.minf, MP4.box(MP4.types.vmhd, MP4.VMHD), MP4.DINF, MP4.stbl(track));\n }\n }\n static moof(sn, baseMediaDecodeTime, track) {\n return MP4.box(MP4.types.moof, MP4.mfhd(sn), MP4.traf(track, baseMediaDecodeTime));\n }\n static moov(tracks) {\n let i = tracks.length;\n const boxes = [];\n while (i--) {\n boxes[i] = MP4.trak(tracks[i]);\n }\n return MP4.box.apply(null, [MP4.types.moov, MP4.mvhd(tracks[0].timescale, tracks[0].duration)].concat(boxes).concat(MP4.mvex(tracks)));\n }\n static mvex(tracks) {\n let i = tracks.length;\n const boxes = [];\n while (i--) {\n boxes[i] = MP4.trex(tracks[i]);\n }\n return MP4.box.apply(null, [MP4.types.mvex, ...boxes]);\n }\n static mvhd(timescale, duration) {\n duration *= timescale;\n const upperWordDuration = Math.floor(duration / (UINT32_MAX + 1));\n const lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));\n const bytes = new Uint8Array([0x01,\n // version 1\n 0x00, 0x00, 0x00,\n // flags\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,\n // creation_time\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03,\n // modification_time\n timescale >> 24 & 0xff, timescale >> 16 & 0xff, timescale >> 8 & 0xff, timescale & 0xff,\n // timescale\n upperWordDuration >> 24, upperWordDuration >> 16 & 0xff, upperWordDuration >> 8 & 0xff, upperWordDuration & 0xff, lowerWordDuration >> 24, lowerWordDuration >> 16 & 0xff, lowerWordDuration >> 8 & 0xff, lowerWordDuration & 0xff, 0x00, 0x01, 0x00, 0x00,\n // 1.0 rate\n 0x01, 0x00,\n // 1.0 volume\n 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,\n // transformation: unity matrix\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n // pre_defined\n 0xff, 0xff, 0xff, 0xff // next_track_ID\n ]);\n return MP4.box(MP4.types.mvhd, bytes);\n }\n static sdtp(track) {\n const samples = track.samples || [];\n const bytes = new Uint8Array(4 + samples.length);\n let i;\n let flags;\n // leave the full box header (4 bytes) all zero\n // write the sample table\n for (i = 0; i < samples.length; i++) {\n flags = samples[i].flags;\n bytes[i + 4] = flags.dependsOn << 4 | flags.isDependedOn << 2 | flags.hasRedundancy;\n }\n return MP4.box(MP4.types.sdtp, bytes);\n }\n static stbl(track) {\n return MP4.box(MP4.types.stbl, MP4.stsd(track), MP4.box(MP4.types.stts, MP4.STTS), MP4.box(MP4.types.stsc, MP4.STSC), MP4.box(MP4.types.stsz, MP4.STSZ), MP4.box(MP4.types.stco, MP4.STCO));\n }\n static avc1(track) {\n let sps = [];\n let pps = [];\n let i;\n let data;\n let len;\n // assemble the SPSs\n\n for (i = 0; i < track.sps.length; i++) {\n data = track.sps[i];\n len = data.byteLength;\n sps.push(len >>> 8 & 0xff);\n sps.push(len & 0xff);\n\n // SPS\n sps = sps.concat(Array.prototype.slice.call(data));\n }\n\n // assemble the PPSs\n for (i = 0; i < track.pps.length; i++) {\n data = track.pps[i];\n len = data.byteLength;\n pps.push(len >>> 8 & 0xff);\n pps.push(len & 0xff);\n pps = pps.concat(Array.prototype.slice.call(data));\n }\n const avcc = MP4.box(MP4.types.avcC, new Uint8Array([0x01,\n // version\n sps[3],\n // profile\n sps[4],\n // profile compat\n sps[5],\n // level\n 0xfc | 3,\n // lengthSizeMinusOne, hard-coded to 4 bytes\n 0xe0 | track.sps.length // 3bit reserved (111) + numOfSequenceParameterSets\n ].concat(sps).concat([track.pps.length // numOfPictureParameterSets\n ]).concat(pps))); // \"PPS\"\n const width = track.width;\n const height = track.height;\n const hSpacing = track.pixelRatio[0];\n const vSpacing = track.pixelRatio[1];\n return MP4.box(MP4.types.avc1, new Uint8Array([0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x01,\n // data_reference_index\n 0x00, 0x00,\n // pre_defined\n 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n // pre_defined\n width >> 8 & 0xff, width & 0xff,\n // width\n height >> 8 & 0xff, height & 0xff,\n // height\n 0x00, 0x48, 0x00, 0x00,\n // horizresolution\n 0x00, 0x48, 0x00, 0x00,\n // vertresolution\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x01,\n // frame_count\n 0x12, 0x64, 0x61, 0x69, 0x6c,\n // dailymotion/hls.js\n 0x79, 0x6d, 0x6f, 0x74, 0x69, 0x6f, 0x6e, 0x2f, 0x68, 0x6c, 0x73, 0x2e, 0x6a, 0x73, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n // compressorname\n 0x00, 0x18,\n // depth = 24\n 0x11, 0x11]),\n // pre_defined = -1\n avcc, MP4.box(MP4.types.btrt, new Uint8Array([0x00, 0x1c, 0x9c, 0x80,\n // bufferSizeDB\n 0x00, 0x2d, 0xc6, 0xc0,\n // maxBitrate\n 0x00, 0x2d, 0xc6, 0xc0])),\n // avgBitrate\n MP4.box(MP4.types.pasp, new Uint8Array([hSpacing >> 24,\n // hSpacing\n hSpacing >> 16 & 0xff, hSpacing >> 8 & 0xff, hSpacing & 0xff, vSpacing >> 24,\n // vSpacing\n vSpacing >> 16 & 0xff, vSpacing >> 8 & 0xff, vSpacing & 0xff])));\n }\n static esds(track) {\n const configlen = track.config.length;\n return new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n\n 0x03,\n // descriptor_type\n 0x17 + configlen,\n // length\n 0x00, 0x01,\n // es_id\n 0x00,\n // stream_priority\n\n 0x04,\n // descriptor_type\n 0x0f + configlen,\n // length\n 0x40,\n // codec : mpeg4_audio\n 0x15,\n // stream_type\n 0x00, 0x00, 0x00,\n // buffer_size\n 0x00, 0x00, 0x00, 0x00,\n // maxBitrate\n 0x00, 0x00, 0x00, 0x00,\n // avgBitrate\n\n 0x05 // descriptor_type\n ].concat([configlen]).concat(track.config).concat([0x06, 0x01, 0x02])); // GASpecificConfig)); // length + audio config descriptor\n }\n static audioStsd(track) {\n const samplerate = track.samplerate;\n return new Uint8Array([0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x01,\n // data_reference_index\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, track.channelCount,\n // channelcount\n 0x00, 0x10,\n // sampleSize:16bits\n 0x00, 0x00, 0x00, 0x00,\n // reserved2\n samplerate >> 8 & 0xff, samplerate & 0xff,\n //\n 0x00, 0x00]);\n }\n static mp4a(track) {\n return MP4.box(MP4.types.mp4a, MP4.audioStsd(track), MP4.box(MP4.types.esds, MP4.esds(track)));\n }\n static mp3(track) {\n return MP4.box(MP4.types['.mp3'], MP4.audioStsd(track));\n }\n static ac3(track) {\n return MP4.box(MP4.types['ac-3'], MP4.audioStsd(track), MP4.box(MP4.types.dac3, track.config));\n }\n static stsd(track) {\n if (track.type === 'audio') {\n if (track.segmentCodec === 'mp3' && track.codec === 'mp3') {\n return MP4.box(MP4.types.stsd, MP4.STSD, MP4.mp3(track));\n }\n if (track.segmentCodec === 'ac3') {\n return MP4.box(MP4.types.stsd, MP4.STSD, MP4.ac3(track));\n }\n return MP4.box(MP4.types.stsd, MP4.STSD, MP4.mp4a(track));\n } else {\n return MP4.box(MP4.types.stsd, MP4.STSD, MP4.avc1(track));\n }\n }\n static tkhd(track) {\n const id = track.id;\n const duration = track.duration * track.timescale;\n const width = track.width;\n const height = track.height;\n const upperWordDuration = Math.floor(duration / (UINT32_MAX + 1));\n const lowerWordDuration = Math.floor(duration % (UINT32_MAX + 1));\n return MP4.box(MP4.types.tkhd, new Uint8Array([0x01,\n // version 1\n 0x00, 0x00, 0x07,\n // flags\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02,\n // creation_time\n 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x03,\n // modification_time\n id >> 24 & 0xff, id >> 16 & 0xff, id >> 8 & 0xff, id & 0xff,\n // track_ID\n 0x00, 0x00, 0x00, 0x00,\n // reserved\n upperWordDuration >> 24, upperWordDuration >> 16 & 0xff, upperWordDuration >> 8 & 0xff, upperWordDuration & 0xff, lowerWordDuration >> 24, lowerWordDuration >> 16 & 0xff, lowerWordDuration >> 8 & 0xff, lowerWordDuration & 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\n // reserved\n 0x00, 0x00,\n // layer\n 0x00, 0x00,\n // alternate_group\n 0x00, 0x00,\n // non-audio track volume\n 0x00, 0x00,\n // reserved\n 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00,\n // transformation: unity matrix\n width >> 8 & 0xff, width & 0xff, 0x00, 0x00,\n // width\n height >> 8 & 0xff, height & 0xff, 0x00, 0x00 // height\n ]));\n }\n static traf(track, baseMediaDecodeTime) {\n const sampleDependencyTable = MP4.sdtp(track);\n const id = track.id;\n const upperWordBaseMediaDecodeTime = Math.floor(baseMediaDecodeTime / (UINT32_MAX + 1));\n const lowerWordBaseMediaDecodeTime = Math.floor(baseMediaDecodeTime % (UINT32_MAX + 1));\n return MP4.box(MP4.types.traf, MP4.box(MP4.types.tfhd, new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n id >> 24, id >> 16 & 0xff, id >> 8 & 0xff, id & 0xff // track_ID\n ])), MP4.box(MP4.types.tfdt, new Uint8Array([0x01,\n // version 1\n 0x00, 0x00, 0x00,\n // flags\n upperWordBaseMediaDecodeTime >> 24, upperWordBaseMediaDecodeTime >> 16 & 0xff, upperWordBaseMediaDecodeTime >> 8 & 0xff, upperWordBaseMediaDecodeTime & 0xff, lowerWordBaseMediaDecodeTime >> 24, lowerWordBaseMediaDecodeTime >> 16 & 0xff, lowerWordBaseMediaDecodeTime >> 8 & 0xff, lowerWordBaseMediaDecodeTime & 0xff])), MP4.trun(track, sampleDependencyTable.length + 16 +\n // tfhd\n 20 +\n // tfdt\n 8 +\n // traf header\n 16 +\n // mfhd\n 8 +\n // moof header\n 8),\n // mdat header\n sampleDependencyTable);\n }\n\n /**\n * Generate a track box.\n * @param track a track definition\n */\n static trak(track) {\n track.duration = track.duration || 0xffffffff;\n return MP4.box(MP4.types.trak, MP4.tkhd(track), MP4.mdia(track));\n }\n static trex(track) {\n const id = track.id;\n return MP4.box(MP4.types.trex, new Uint8Array([0x00,\n // version 0\n 0x00, 0x00, 0x00,\n // flags\n id >> 24, id >> 16 & 0xff, id >> 8 & 0xff, id & 0xff,\n // track_ID\n 0x00, 0x00, 0x00, 0x01,\n // default_sample_description_index\n 0x00, 0x00, 0x00, 0x00,\n // default_sample_duration\n 0x00, 0x00, 0x00, 0x00,\n // default_sample_size\n 0x00, 0x01, 0x00, 0x01 // default_sample_flags\n ]));\n }\n static trun(track, offset) {\n const samples = track.samples || [];\n const len = samples.length;\n const arraylen = 12 + 16 * len;\n const array = new Uint8Array(arraylen);\n let i;\n let sample;\n let duration;\n let size;\n let flags;\n let cts;\n offset += 8 + arraylen;\n array.set([track.type === 'video' ? 0x01 : 0x00,\n // version 1 for video with signed-int sample_composition_time_offset\n 0x00, 0x0f, 0x01,\n // flags\n len >>> 24 & 0xff, len >>> 16 & 0xff, len >>> 8 & 0xff, len & 0xff,\n // sample_count\n offset >>> 24 & 0xff, offset >>> 16 & 0xff, offset >>> 8 & 0xff, offset & 0xff // data_offset\n ], 0);\n for (i = 0; i < len; i++) {\n sample = samples[i];\n duration = sample.duration;\n size = sample.size;\n flags = sample.flags;\n cts = sample.cts;\n array.set([duration >>> 24 & 0xff, duration >>> 16 & 0xff, duration >>> 8 & 0xff, duration & 0xff,\n // sample_duration\n size >>> 24 & 0xff, size >>> 16 & 0xff, size >>> 8 & 0xff, size & 0xff,\n // sample_size\n flags.isLeading << 2 | flags.dependsOn, flags.isDependedOn << 6 | flags.hasRedundancy << 4 | flags.paddingValue << 1 | flags.isNonSync, flags.degradPrio & 0xf0 << 8, flags.degradPrio & 0x0f,\n // sample_flags\n cts >>> 24 & 0xff, cts >>> 16 & 0xff, cts >>> 8 & 0xff, cts & 0xff // sample_composition_time_offset\n ], 12 + 16 * i);\n }\n return MP4.box(MP4.types.trun, array);\n }\n static initSegment(tracks) {\n if (!MP4.types) {\n MP4.init();\n }\n const movie = MP4.moov(tracks);\n const result = appendUint8Array(MP4.FTYP, movie);\n return result;\n }\n}\nMP4.types = void 0;\nMP4.HDLR_TYPES = void 0;\nMP4.STTS = void 0;\nMP4.STSC = void 0;\nMP4.STCO = void 0;\nMP4.STSZ = void 0;\nMP4.VMHD = void 0;\nMP4.SMHD = void 0;\nMP4.STSD = void 0;\nMP4.FTYP = void 0;\nMP4.DINF = void 0;\n\nconst MPEG_TS_CLOCK_FREQ_HZ = 90000;\nfunction toTimescaleFromBase(baseTime, destScale, srcBase = 1, round = false) {\n const result = baseTime * destScale * srcBase; // equivalent to `(value * scale) / (1 / base)`\n return round ? Math.round(result) : result;\n}\nfunction toTimescaleFromScale(baseTime, destScale, srcScale = 1, round = false) {\n return toTimescaleFromBase(baseTime, destScale, 1 / srcScale, round);\n}\nfunction toMsFromMpegTsClock(baseTime, round = false) {\n return toTimescaleFromBase(baseTime, 1000, 1 / MPEG_TS_CLOCK_FREQ_HZ, round);\n}\nfunction toMpegTsClockFromTimescale(baseTime, srcScale = 1) {\n return toTimescaleFromBase(baseTime, MPEG_TS_CLOCK_FREQ_HZ, 1 / srcScale);\n}\n\nconst MAX_SILENT_FRAME_DURATION = 10 * 1000; // 10 seconds\nconst AAC_SAMPLES_PER_FRAME = 1024;\nconst MPEG_AUDIO_SAMPLE_PER_FRAME = 1152;\nconst AC3_SAMPLES_PER_FRAME = 1536;\nlet chromeVersion = null;\nlet safariWebkitVersion = null;\nclass MP4Remuxer {\n constructor(observer, config, typeSupported, vendor = '') {\n this.observer = void 0;\n this.config = void 0;\n this.typeSupported = void 0;\n this.ISGenerated = false;\n this._initPTS = null;\n this._initDTS = null;\n this.nextAvcDts = null;\n this.nextAudioPts = null;\n this.videoSampleDuration = null;\n this.isAudioContiguous = false;\n this.isVideoContiguous = false;\n this.videoTrackConfig = void 0;\n this.observer = observer;\n this.config = config;\n this.typeSupported = typeSupported;\n this.ISGenerated = false;\n if (chromeVersion === null) {\n const userAgent = navigator.userAgent || '';\n const result = userAgent.match(/Chrome\\/(\\d+)/i);\n chromeVersion = result ? parseInt(result[1]) : 0;\n }\n if (safariWebkitVersion === null) {\n const result = navigator.userAgent.match(/Safari\\/(\\d+)/i);\n safariWebkitVersion = result ? parseInt(result[1]) : 0;\n }\n }\n destroy() {\n // @ts-ignore\n this.config = this.videoTrackConfig = this._initPTS = this._initDTS = null;\n }\n resetTimeStamp(defaultTimeStamp) {\n logger.log('[mp4-remuxer]: initPTS & initDTS reset');\n this._initPTS = this._initDTS = defaultTimeStamp;\n }\n resetNextTimestamp() {\n logger.log('[mp4-remuxer]: reset next timestamp');\n this.isVideoContiguous = false;\n this.isAudioContiguous = false;\n }\n resetInitSegment() {\n logger.log('[mp4-remuxer]: ISGenerated flag reset');\n this.ISGenerated = false;\n this.videoTrackConfig = undefined;\n }\n getVideoStartPts(videoSamples) {\n let rolloverDetected = false;\n const startPTS = videoSamples.reduce((minPTS, sample) => {\n const delta = sample.pts - minPTS;\n if (delta < -4294967296) {\n // 2^32, see PTSNormalize for reasoning, but we're hitting a rollover here, and we don't want that to impact the timeOffset calculation\n rolloverDetected = true;\n return normalizePts(minPTS, sample.pts);\n } else if (delta > 0) {\n return minPTS;\n } else {\n return sample.pts;\n }\n }, videoSamples[0].pts);\n if (rolloverDetected) {\n logger.debug('PTS rollover detected');\n }\n return startPTS;\n }\n remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, accurateTimeOffset, flush, playlistType) {\n let video;\n let audio;\n let initSegment;\n let text;\n let id3;\n let independent;\n let audioTimeOffset = timeOffset;\n let videoTimeOffset = timeOffset;\n\n // If we're remuxing audio and video progressively, wait until we've received enough samples for each track before proceeding.\n // This is done to synchronize the audio and video streams. We know if the current segment will have samples if the \"pid\"\n // parameter is greater than -1. The pid is set when the PMT is parsed, which contains the tracks list.\n // However, if the initSegment has already been generated, or we've reached the end of a segment (flush),\n // then we can remux one track without waiting for the other.\n const hasAudio = audioTrack.pid > -1;\n const hasVideo = videoTrack.pid > -1;\n const length = videoTrack.samples.length;\n const enoughAudioSamples = audioTrack.samples.length > 0;\n const enoughVideoSamples = flush && length > 0 || length > 1;\n const canRemuxAvc = (!hasAudio || enoughAudioSamples) && (!hasVideo || enoughVideoSamples) || this.ISGenerated || flush;\n if (canRemuxAvc) {\n if (this.ISGenerated) {\n var _videoTrack$pixelRati, _config$pixelRatio, _videoTrack$pixelRati2, _config$pixelRatio2;\n const config = this.videoTrackConfig;\n if (config && (videoTrack.width !== config.width || videoTrack.height !== config.height || ((_videoTrack$pixelRati = videoTrack.pixelRatio) == null ? void 0 : _videoTrack$pixelRati[0]) !== ((_config$pixelRatio = config.pixelRatio) == null ? void 0 : _config$pixelRatio[0]) || ((_videoTrack$pixelRati2 = videoTrack.pixelRatio) == null ? void 0 : _videoTrack$pixelRati2[1]) !== ((_config$pixelRatio2 = config.pixelRatio) == null ? void 0 : _config$pixelRatio2[1]))) {\n this.resetInitSegment();\n }\n } else {\n initSegment = this.generateIS(audioTrack, videoTrack, timeOffset, accurateTimeOffset);\n }\n const isVideoContiguous = this.isVideoContiguous;\n let firstKeyFrameIndex = -1;\n let firstKeyFramePTS;\n if (enoughVideoSamples) {\n firstKeyFrameIndex = findKeyframeIndex(videoTrack.samples);\n if (!isVideoContiguous && this.config.forceKeyFrameOnDiscontinuity) {\n independent = true;\n if (firstKeyFrameIndex > 0) {\n logger.warn(`[mp4-remuxer]: Dropped ${firstKeyFrameIndex} out of ${length} video samples due to a missing keyframe`);\n const startPTS = this.getVideoStartPts(videoTrack.samples);\n videoTrack.samples = videoTrack.samples.slice(firstKeyFrameIndex);\n videoTrack.dropped += firstKeyFrameIndex;\n videoTimeOffset += (videoTrack.samples[0].pts - startPTS) / videoTrack.inputTimeScale;\n firstKeyFramePTS = videoTimeOffset;\n } else if (firstKeyFrameIndex === -1) {\n logger.warn(`[mp4-remuxer]: No keyframe found out of ${length} video samples`);\n independent = false;\n }\n }\n }\n if (this.ISGenerated) {\n if (enoughAudioSamples && enoughVideoSamples) {\n // timeOffset is expected to be the offset of the first timestamp of this fragment (first DTS)\n // if first audio DTS is not aligned with first video DTS then we need to take that into account\n // when providing timeOffset to remuxAudio / remuxVideo. if we don't do that, there might be a permanent / small\n // drift between audio and video streams\n const startPTS = this.getVideoStartPts(videoTrack.samples);\n const tsDelta = normalizePts(audioTrack.samples[0].pts, startPTS) - startPTS;\n const audiovideoTimestampDelta = tsDelta / videoTrack.inputTimeScale;\n audioTimeOffset += Math.max(0, audiovideoTimestampDelta);\n videoTimeOffset += Math.max(0, -audiovideoTimestampDelta);\n }\n\n // Purposefully remuxing audio before video, so that remuxVideo can use nextAudioPts, which is calculated in remuxAudio.\n if (enoughAudioSamples) {\n // if initSegment was generated without audio samples, regenerate it again\n if (!audioTrack.samplerate) {\n logger.warn('[mp4-remuxer]: regenerate InitSegment as audio detected');\n initSegment = this.generateIS(audioTrack, videoTrack, timeOffset, accurateTimeOffset);\n }\n audio = this.remuxAudio(audioTrack, audioTimeOffset, this.isAudioContiguous, accurateTimeOffset, hasVideo || enoughVideoSamples || playlistType === PlaylistLevelType.AUDIO ? videoTimeOffset : undefined);\n if (enoughVideoSamples) {\n const audioTrackLength = audio ? audio.endPTS - audio.startPTS : 0;\n // if initSegment was generated without video samples, regenerate it again\n if (!videoTrack.inputTimeScale) {\n logger.warn('[mp4-remuxer]: regenerate InitSegment as video detected');\n initSegment = this.generateIS(audioTrack, videoTrack, timeOffset, accurateTimeOffset);\n }\n video = this.remuxVideo(videoTrack, videoTimeOffset, isVideoContiguous, audioTrackLength);\n }\n } else if (enoughVideoSamples) {\n video = this.remuxVideo(videoTrack, videoTimeOffset, isVideoContiguous, 0);\n }\n if (video) {\n video.firstKeyFrame = firstKeyFrameIndex;\n video.independent = firstKeyFrameIndex !== -1;\n video.firstKeyFramePTS = firstKeyFramePTS;\n }\n }\n }\n\n // Allow ID3 and text to remux, even if more audio/video samples are required\n if (this.ISGenerated && this._initPTS && this._initDTS) {\n if (id3Track.samples.length) {\n id3 = flushTextTrackMetadataCueSamples(id3Track, timeOffset, this._initPTS, this._initDTS);\n }\n if (textTrack.samples.length) {\n text = flushTextTrackUserdataCueSamples(textTrack, timeOffset, this._initPTS);\n }\n }\n return {\n audio,\n video,\n initSegment,\n independent,\n text,\n id3\n };\n }\n generateIS(audioTrack, videoTrack, timeOffset, accurateTimeOffset) {\n const audioSamples = audioTrack.samples;\n const videoSamples = videoTrack.samples;\n const typeSupported = this.typeSupported;\n const tracks = {};\n const _initPTS = this._initPTS;\n let computePTSDTS = !_initPTS || accurateTimeOffset;\n let container = 'audio/mp4';\n let initPTS;\n let initDTS;\n let timescale;\n if (computePTSDTS) {\n initPTS = initDTS = Infinity;\n }\n if (audioTrack.config && audioSamples.length) {\n // let's use audio sampling rate as MP4 time scale.\n // rationale is that there is a integer nb of audio frames per audio sample (1024 for AAC)\n // using audio sampling rate here helps having an integer MP4 frame duration\n // this avoids potential rounding issue and AV sync issue\n audioTrack.timescale = audioTrack.samplerate;\n switch (audioTrack.segmentCodec) {\n case 'mp3':\n if (typeSupported.mpeg) {\n // Chrome and Safari\n container = 'audio/mpeg';\n audioTrack.codec = '';\n } else if (typeSupported.mp3) {\n // Firefox\n audioTrack.codec = 'mp3';\n }\n break;\n case 'ac3':\n audioTrack.codec = 'ac-3';\n break;\n }\n tracks.audio = {\n id: 'audio',\n container: container,\n codec: audioTrack.codec,\n initSegment: audioTrack.segmentCodec === 'mp3' && typeSupported.mpeg ? new Uint8Array(0) : MP4.initSegment([audioTrack]),\n metadata: {\n channelCount: audioTrack.channelCount\n }\n };\n if (computePTSDTS) {\n timescale = audioTrack.inputTimeScale;\n if (!_initPTS || timescale !== _initPTS.timescale) {\n // remember first PTS of this demuxing context. for audio, PTS = DTS\n initPTS = initDTS = audioSamples[0].pts - Math.round(timescale * timeOffset);\n } else {\n computePTSDTS = false;\n }\n }\n }\n if (videoTrack.sps && videoTrack.pps && videoSamples.length) {\n // let's use input time scale as MP4 video timescale\n // we use input time scale straight away to avoid rounding issues on frame duration / cts computation\n videoTrack.timescale = videoTrack.inputTimeScale;\n tracks.video = {\n id: 'main',\n container: 'video/mp4',\n codec: videoTrack.codec,\n initSegment: MP4.initSegment([videoTrack]),\n metadata: {\n width: videoTrack.width,\n height: videoTrack.height\n }\n };\n if (computePTSDTS) {\n timescale = videoTrack.inputTimeScale;\n if (!_initPTS || timescale !== _initPTS.timescale) {\n const startPTS = this.getVideoStartPts(videoSamples);\n const startOffset = Math.round(timescale * timeOffset);\n initDTS = Math.min(initDTS, normalizePts(videoSamples[0].dts, startPTS) - startOffset);\n initPTS = Math.min(initPTS, startPTS - startOffset);\n } else {\n computePTSDTS = false;\n }\n }\n this.videoTrackConfig = {\n width: videoTrack.width,\n height: videoTrack.height,\n pixelRatio: videoTrack.pixelRatio\n };\n }\n if (Object.keys(tracks).length) {\n this.ISGenerated = true;\n if (computePTSDTS) {\n this._initPTS = {\n baseTime: initPTS,\n timescale: timescale\n };\n this._initDTS = {\n baseTime: initDTS,\n timescale: timescale\n };\n } else {\n initPTS = timescale = undefined;\n }\n return {\n tracks,\n initPTS,\n timescale\n };\n }\n }\n remuxVideo(track, timeOffset, contiguous, audioTrackLength) {\n const timeScale = track.inputTimeScale;\n const inputSamples = track.samples;\n const outputSamples = [];\n const nbSamples = inputSamples.length;\n const initPTS = this._initPTS;\n let nextAvcDts = this.nextAvcDts;\n let offset = 8;\n let mp4SampleDuration = this.videoSampleDuration;\n let firstDTS;\n let lastDTS;\n let minPTS = Number.POSITIVE_INFINITY;\n let maxPTS = Number.NEGATIVE_INFINITY;\n let sortSamples = false;\n\n // if parsed fragment is contiguous with last one, let's use last DTS value as reference\n if (!contiguous || nextAvcDts === null) {\n const pts = timeOffset * timeScale;\n const cts = inputSamples[0].pts - normalizePts(inputSamples[0].dts, inputSamples[0].pts);\n if (chromeVersion && nextAvcDts !== null && Math.abs(pts - cts - nextAvcDts) < 15000) {\n // treat as contigous to adjust samples that would otherwise produce video buffer gaps in Chrome\n contiguous = true;\n } else {\n // if not contiguous, let's use target timeOffset\n nextAvcDts = pts - cts;\n }\n }\n\n // PTS is coded on 33bits, and can loop from -2^32 to 2^32\n // PTSNormalize will make PTS/DTS value monotonic, we use last known DTS value as reference value\n const initTime = initPTS.baseTime * timeScale / initPTS.timescale;\n for (let i = 0; i < nbSamples; i++) {\n const sample = inputSamples[i];\n sample.pts = normalizePts(sample.pts - initTime, nextAvcDts);\n sample.dts = normalizePts(sample.dts - initTime, nextAvcDts);\n if (sample.dts < inputSamples[i > 0 ? i - 1 : i].dts) {\n sortSamples = true;\n }\n }\n\n // sort video samples by DTS then PTS then demux id order\n if (sortSamples) {\n inputSamples.sort(function (a, b) {\n const deltadts = a.dts - b.dts;\n const deltapts = a.pts - b.pts;\n return deltadts || deltapts;\n });\n }\n\n // Get first/last DTS\n firstDTS = inputSamples[0].dts;\n lastDTS = inputSamples[inputSamples.length - 1].dts;\n\n // Sample duration (as expected by trun MP4 boxes), should be the delta between sample DTS\n // set this constant duration as being the avg delta between consecutive DTS.\n const inputDuration = lastDTS - firstDTS;\n const averageSampleDuration = inputDuration ? Math.round(inputDuration / (nbSamples - 1)) : mp4SampleDuration || track.inputTimeScale / 30;\n\n // if fragment are contiguous, detect hole/overlapping between fragments\n if (contiguous) {\n // check timestamp continuity across consecutive fragments (this is to remove inter-fragment gap/hole)\n const delta = firstDTS - nextAvcDts;\n const foundHole = delta > averageSampleDuration;\n const foundOverlap = delta < -1;\n if (foundHole || foundOverlap) {\n if (foundHole) {\n logger.warn(`AVC: ${toMsFromMpegTsClock(delta, true)} ms (${delta}dts) hole between fragments detected at ${timeOffset.toFixed(3)}`);\n } else {\n logger.warn(`AVC: ${toMsFromMpegTsClock(-delta, true)} ms (${delta}dts) overlapping between fragments detected at ${timeOffset.toFixed(3)}`);\n }\n if (!foundOverlap || nextAvcDts >= inputSamples[0].pts || chromeVersion) {\n firstDTS = nextAvcDts;\n const firstPTS = inputSamples[0].pts - delta;\n if (foundHole) {\n inputSamples[0].dts = firstDTS;\n inputSamples[0].pts = firstPTS;\n } else {\n for (let i = 0; i < inputSamples.length; i++) {\n if (inputSamples[i].dts > firstPTS) {\n break;\n }\n inputSamples[i].dts -= delta;\n inputSamples[i].pts -= delta;\n }\n }\n logger.log(`Video: Initial PTS/DTS adjusted: ${toMsFromMpegTsClock(firstPTS, true)}/${toMsFromMpegTsClock(firstDTS, true)}, delta: ${toMsFromMpegTsClock(delta, true)} ms`);\n }\n }\n }\n firstDTS = Math.max(0, firstDTS);\n let nbNalu = 0;\n let naluLen = 0;\n let dtsStep = firstDTS;\n for (let i = 0; i < nbSamples; i++) {\n // compute total/avc sample length and nb of NAL units\n const sample = inputSamples[i];\n const units = sample.units;\n const nbUnits = units.length;\n let sampleLen = 0;\n for (let j = 0; j < nbUnits; j++) {\n sampleLen += units[j].data.length;\n }\n naluLen += sampleLen;\n nbNalu += nbUnits;\n sample.length = sampleLen;\n\n // ensure sample monotonic DTS\n if (sample.dts < dtsStep) {\n sample.dts = dtsStep;\n dtsStep += averageSampleDuration / 4 | 0 || 1;\n } else {\n dtsStep = sample.dts;\n }\n minPTS = Math.min(sample.pts, minPTS);\n maxPTS = Math.max(sample.pts, maxPTS);\n }\n lastDTS = inputSamples[nbSamples - 1].dts;\n\n /* concatenate the video data and construct the mdat in place\n (need 8 more bytes to fill length and mpdat type) */\n const mdatSize = naluLen + 4 * nbNalu + 8;\n let mdat;\n try {\n mdat = new Uint8Array(mdatSize);\n } catch (err) {\n this.observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MUX_ERROR,\n details: ErrorDetails.REMUX_ALLOC_ERROR,\n fatal: false,\n error: err,\n bytes: mdatSize,\n reason: `fail allocating video mdat ${mdatSize}`\n });\n return;\n }\n const view = new DataView(mdat.buffer);\n view.setUint32(0, mdatSize);\n mdat.set(MP4.types.mdat, 4);\n let stretchedLastFrame = false;\n let minDtsDelta = Number.POSITIVE_INFINITY;\n let minPtsDelta = Number.POSITIVE_INFINITY;\n let maxDtsDelta = Number.NEGATIVE_INFINITY;\n let maxPtsDelta = Number.NEGATIVE_INFINITY;\n for (let i = 0; i < nbSamples; i++) {\n const VideoSample = inputSamples[i];\n const VideoSampleUnits = VideoSample.units;\n let mp4SampleLength = 0;\n // convert NALU bitstream to MP4 format (prepend NALU with size field)\n for (let j = 0, nbUnits = VideoSampleUnits.length; j < nbUnits; j++) {\n const unit = VideoSampleUnits[j];\n const unitData = unit.data;\n const unitDataLen = unit.data.byteLength;\n view.setUint32(offset, unitDataLen);\n offset += 4;\n mdat.set(unitData, offset);\n offset += unitDataLen;\n mp4SampleLength += 4 + unitDataLen;\n }\n\n // expected sample duration is the Decoding Timestamp diff of consecutive samples\n let ptsDelta;\n if (i < nbSamples - 1) {\n mp4SampleDuration = inputSamples[i + 1].dts - VideoSample.dts;\n ptsDelta = inputSamples[i + 1].pts - VideoSample.pts;\n } else {\n const config = this.config;\n const lastFrameDuration = i > 0 ? VideoSample.dts - inputSamples[i - 1].dts : averageSampleDuration;\n ptsDelta = i > 0 ? VideoSample.pts - inputSamples[i - 1].pts : averageSampleDuration;\n if (config.stretchShortVideoTrack && this.nextAudioPts !== null) {\n // In some cases, a segment's audio track duration may exceed the video track duration.\n // Since we've already remuxed audio, and we know how long the audio track is, we look to\n // see if the delta to the next segment is longer than maxBufferHole.\n // If so, playback would potentially get stuck, so we artificially inflate\n // the duration of the last frame to minimize any potential gap between segments.\n const gapTolerance = Math.floor(config.maxBufferHole * timeScale);\n const deltaToFrameEnd = (audioTrackLength ? minPTS + audioTrackLength * timeScale : this.nextAudioPts) - VideoSample.pts;\n if (deltaToFrameEnd > gapTolerance) {\n // We subtract lastFrameDuration from deltaToFrameEnd to try to prevent any video\n // frame overlap. maxBufferHole should be >> lastFrameDuration anyway.\n mp4SampleDuration = deltaToFrameEnd - lastFrameDuration;\n if (mp4SampleDuration < 0) {\n mp4SampleDuration = lastFrameDuration;\n } else {\n stretchedLastFrame = true;\n }\n logger.log(`[mp4-remuxer]: It is approximately ${deltaToFrameEnd / 90} ms to the next segment; using duration ${mp4SampleDuration / 90} ms for the last video frame.`);\n } else {\n mp4SampleDuration = lastFrameDuration;\n }\n } else {\n mp4SampleDuration = lastFrameDuration;\n }\n }\n const compositionTimeOffset = Math.round(VideoSample.pts - VideoSample.dts);\n minDtsDelta = Math.min(minDtsDelta, mp4SampleDuration);\n maxDtsDelta = Math.max(maxDtsDelta, mp4SampleDuration);\n minPtsDelta = Math.min(minPtsDelta, ptsDelta);\n maxPtsDelta = Math.max(maxPtsDelta, ptsDelta);\n outputSamples.push(new Mp4Sample(VideoSample.key, mp4SampleDuration, mp4SampleLength, compositionTimeOffset));\n }\n if (outputSamples.length) {\n if (chromeVersion) {\n if (chromeVersion < 70) {\n // Chrome workaround, mark first sample as being a Random Access Point (keyframe) to avoid sourcebuffer append issue\n // https://code.google.com/p/chromium/issues/detail?id=229412\n const flags = outputSamples[0].flags;\n flags.dependsOn = 2;\n flags.isNonSync = 0;\n }\n } else if (safariWebkitVersion) {\n // Fix for \"CNN special report, with CC\" in test-streams (Safari browser only)\n // Ignore DTS when frame durations are irregular. Safari MSE does not handle this leading to gaps.\n if (maxPtsDelta - minPtsDelta < maxDtsDelta - minDtsDelta && averageSampleDuration / maxDtsDelta < 0.025 && outputSamples[0].cts === 0) {\n logger.warn('Found irregular gaps in sample duration. Using PTS instead of DTS to determine MP4 sample duration.');\n let dts = firstDTS;\n for (let i = 0, len = outputSamples.length; i < len; i++) {\n const nextDts = dts + outputSamples[i].duration;\n const pts = dts + outputSamples[i].cts;\n if (i < len - 1) {\n const nextPts = nextDts + outputSamples[i + 1].cts;\n outputSamples[i].duration = nextPts - pts;\n } else {\n outputSamples[i].duration = i ? outputSamples[i - 1].duration : averageSampleDuration;\n }\n outputSamples[i].cts = 0;\n dts = nextDts;\n }\n }\n }\n }\n // next AVC sample DTS should be equal to last sample DTS + last sample duration (in PES timescale)\n mp4SampleDuration = stretchedLastFrame || !mp4SampleDuration ? averageSampleDuration : mp4SampleDuration;\n this.nextAvcDts = nextAvcDts = lastDTS + mp4SampleDuration;\n this.videoSampleDuration = mp4SampleDuration;\n this.isVideoContiguous = true;\n const moof = MP4.moof(track.sequenceNumber++, firstDTS, _extends({}, track, {\n samples: outputSamples\n }));\n const type = 'video';\n const data = {\n data1: moof,\n data2: mdat,\n startPTS: minPTS / timeScale,\n endPTS: (maxPTS + mp4SampleDuration) / timeScale,\n startDTS: firstDTS / timeScale,\n endDTS: nextAvcDts / timeScale,\n type,\n hasAudio: false,\n hasVideo: true,\n nb: outputSamples.length,\n dropped: track.dropped\n };\n track.samples = [];\n track.dropped = 0;\n return data;\n }\n getSamplesPerFrame(track) {\n switch (track.segmentCodec) {\n case 'mp3':\n return MPEG_AUDIO_SAMPLE_PER_FRAME;\n case 'ac3':\n return AC3_SAMPLES_PER_FRAME;\n default:\n return AAC_SAMPLES_PER_FRAME;\n }\n }\n remuxAudio(track, timeOffset, contiguous, accurateTimeOffset, videoTimeOffset) {\n const inputTimeScale = track.inputTimeScale;\n const mp4timeScale = track.samplerate ? track.samplerate : inputTimeScale;\n const scaleFactor = inputTimeScale / mp4timeScale;\n const mp4SampleDuration = this.getSamplesPerFrame(track);\n const inputSampleDuration = mp4SampleDuration * scaleFactor;\n const initPTS = this._initPTS;\n const rawMPEG = track.segmentCodec === 'mp3' && this.typeSupported.mpeg;\n const outputSamples = [];\n const alignedWithVideo = videoTimeOffset !== undefined;\n let inputSamples = track.samples;\n let offset = rawMPEG ? 0 : 8;\n let nextAudioPts = this.nextAudioPts || -1;\n\n // window.audioSamples ? window.audioSamples.push(inputSamples.map(s => s.pts)) : (window.audioSamples = [inputSamples.map(s => s.pts)]);\n\n // for audio samples, also consider consecutive fragments as being contiguous (even if a level switch occurs),\n // for sake of clarity:\n // consecutive fragments are frags with\n // - less than 100ms gaps between new time offset (if accurate) and next expected PTS OR\n // - less than 20 audio frames distance\n // contiguous fragments are consecutive fragments from same quality level (same level, new SN = old SN + 1)\n // this helps ensuring audio continuity\n // and this also avoids audio glitches/cut when switching quality, or reporting wrong duration on first audio frame\n const timeOffsetMpegTS = timeOffset * inputTimeScale;\n const initTime = initPTS.baseTime * inputTimeScale / initPTS.timescale;\n this.isAudioContiguous = contiguous = contiguous || inputSamples.length && nextAudioPts > 0 && (accurateTimeOffset && Math.abs(timeOffsetMpegTS - nextAudioPts) < 9000 || Math.abs(normalizePts(inputSamples[0].pts - initTime, timeOffsetMpegTS) - nextAudioPts) < 20 * inputSampleDuration);\n\n // compute normalized PTS\n inputSamples.forEach(function (sample) {\n sample.pts = normalizePts(sample.pts - initTime, timeOffsetMpegTS);\n });\n if (!contiguous || nextAudioPts < 0) {\n // filter out sample with negative PTS that are not playable anyway\n // if we don't remove these negative samples, they will shift all audio samples forward.\n // leading to audio overlap between current / next fragment\n inputSamples = inputSamples.filter(sample => sample.pts >= 0);\n\n // in case all samples have negative PTS, and have been filtered out, return now\n if (!inputSamples.length) {\n return;\n }\n if (videoTimeOffset === 0) {\n // Set the start to 0 to match video so that start gaps larger than inputSampleDuration are filled with silence\n nextAudioPts = 0;\n } else if (accurateTimeOffset && !alignedWithVideo) {\n // When not seeking, not live, and LevelDetails.PTSKnown, use fragment start as predicted next audio PTS\n nextAudioPts = Math.max(0, timeOffsetMpegTS);\n } else {\n // if frags are not contiguous and if we cant trust time offset, let's use first sample PTS as next audio PTS\n nextAudioPts = inputSamples[0].pts;\n }\n }\n\n // If the audio track is missing samples, the frames seem to get \"left-shifted\" within the\n // resulting mp4 segment, causing sync issues and leaving gaps at the end of the audio segment.\n // In an effort to prevent this from happening, we inject frames here where there are gaps.\n // When possible, we inject a silent frame; when that's not possible, we duplicate the last\n // frame.\n\n if (track.segmentCodec === 'aac') {\n const maxAudioFramesDrift = this.config.maxAudioFramesDrift;\n for (let i = 0, nextPts = nextAudioPts; i < inputSamples.length; i++) {\n // First, let's see how far off this frame is from where we expect it to be\n const sample = inputSamples[i];\n const pts = sample.pts;\n const delta = pts - nextPts;\n const duration = Math.abs(1000 * delta / inputTimeScale);\n\n // When remuxing with video, if we're overlapping by more than a duration, drop this sample to stay in sync\n if (delta <= -maxAudioFramesDrift * inputSampleDuration && alignedWithVideo) {\n if (i === 0) {\n logger.warn(`Audio frame @ ${(pts / inputTimeScale).toFixed(3)}s overlaps nextAudioPts by ${Math.round(1000 * delta / inputTimeScale)} ms.`);\n this.nextAudioPts = nextAudioPts = nextPts = pts;\n }\n } // eslint-disable-line brace-style\n\n // Insert missing frames if:\n // 1: We're more than maxAudioFramesDrift frame away\n // 2: Not more than MAX_SILENT_FRAME_DURATION away\n // 3: currentTime (aka nextPtsNorm) is not 0\n // 4: remuxing with video (videoTimeOffset !== undefined)\n else if (delta >= maxAudioFramesDrift * inputSampleDuration && duration < MAX_SILENT_FRAME_DURATION && alignedWithVideo) {\n let missing = Math.round(delta / inputSampleDuration);\n // Adjust nextPts so that silent samples are aligned with media pts. This will prevent media samples from\n // later being shifted if nextPts is based on timeOffset and delta is not a multiple of inputSampleDuration.\n nextPts = pts - missing * inputSampleDuration;\n if (nextPts < 0) {\n missing--;\n nextPts += inputSampleDuration;\n }\n if (i === 0) {\n this.nextAudioPts = nextAudioPts = nextPts;\n }\n logger.warn(`[mp4-remuxer]: Injecting ${missing} audio frame @ ${(nextPts / inputTimeScale).toFixed(3)}s due to ${Math.round(1000 * delta / inputTimeScale)} ms gap.`);\n for (let j = 0; j < missing; j++) {\n const newStamp = Math.max(nextPts, 0);\n let fillFrame = AAC.getSilentFrame(track.manifestCodec || track.codec, track.channelCount);\n if (!fillFrame) {\n logger.log('[mp4-remuxer]: Unable to get silent frame for given audio codec; duplicating last frame instead.');\n fillFrame = sample.unit.subarray();\n }\n inputSamples.splice(i, 0, {\n unit: fillFrame,\n pts: newStamp\n });\n nextPts += inputSampleDuration;\n i++;\n }\n }\n sample.pts = nextPts;\n nextPts += inputSampleDuration;\n }\n }\n let firstPTS = null;\n let lastPTS = null;\n let mdat;\n let mdatSize = 0;\n let sampleLength = inputSamples.length;\n while (sampleLength--) {\n mdatSize += inputSamples[sampleLength].unit.byteLength;\n }\n for (let j = 0, _nbSamples = inputSamples.length; j < _nbSamples; j++) {\n const audioSample = inputSamples[j];\n const unit = audioSample.unit;\n let pts = audioSample.pts;\n if (lastPTS !== null) {\n // If we have more than one sample, set the duration of the sample to the \"real\" duration; the PTS diff with\n // the previous sample\n const prevSample = outputSamples[j - 1];\n prevSample.duration = Math.round((pts - lastPTS) / scaleFactor);\n } else {\n if (contiguous && track.segmentCodec === 'aac') {\n // set PTS/DTS to expected PTS/DTS\n pts = nextAudioPts;\n }\n // remember first PTS of our audioSamples\n firstPTS = pts;\n if (mdatSize > 0) {\n /* concatenate the audio data and construct the mdat in place\n (need 8 more bytes to fill length and mdat type) */\n mdatSize += offset;\n try {\n mdat = new Uint8Array(mdatSize);\n } catch (err) {\n this.observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MUX_ERROR,\n details: ErrorDetails.REMUX_ALLOC_ERROR,\n fatal: false,\n error: err,\n bytes: mdatSize,\n reason: `fail allocating audio mdat ${mdatSize}`\n });\n return;\n }\n if (!rawMPEG) {\n const view = new DataView(mdat.buffer);\n view.setUint32(0, mdatSize);\n mdat.set(MP4.types.mdat, 4);\n }\n } else {\n // no audio samples\n return;\n }\n }\n mdat.set(unit, offset);\n const unitLen = unit.byteLength;\n offset += unitLen;\n // Default the sample's duration to the computed mp4SampleDuration, which will either be 1024 for AAC or 1152 for MPEG\n // In the case that we have 1 sample, this will be the duration. If we have more than one sample, the duration\n // becomes the PTS diff with the previous sample\n outputSamples.push(new Mp4Sample(true, mp4SampleDuration, unitLen, 0));\n lastPTS = pts;\n }\n\n // We could end up with no audio samples if all input samples were overlapping with the previously remuxed ones\n const nbSamples = outputSamples.length;\n if (!nbSamples) {\n return;\n }\n\n // The next audio sample PTS should be equal to last sample PTS + duration\n const lastSample = outputSamples[outputSamples.length - 1];\n this.nextAudioPts = nextAudioPts = lastPTS + scaleFactor * lastSample.duration;\n\n // Set the track samples from inputSamples to outputSamples before remuxing\n const moof = rawMPEG ? new Uint8Array(0) : MP4.moof(track.sequenceNumber++, firstPTS / scaleFactor, _extends({}, track, {\n samples: outputSamples\n }));\n\n // Clear the track samples. This also clears the samples array in the demuxer, since the reference is shared\n track.samples = [];\n const start = firstPTS / inputTimeScale;\n const end = nextAudioPts / inputTimeScale;\n const type = 'audio';\n const audioData = {\n data1: moof,\n data2: mdat,\n startPTS: start,\n endPTS: end,\n startDTS: start,\n endDTS: end,\n type,\n hasAudio: true,\n hasVideo: false,\n nb: nbSamples\n };\n this.isAudioContiguous = true;\n return audioData;\n }\n remuxEmptyAudio(track, timeOffset, contiguous, videoData) {\n const inputTimeScale = track.inputTimeScale;\n const mp4timeScale = track.samplerate ? track.samplerate : inputTimeScale;\n const scaleFactor = inputTimeScale / mp4timeScale;\n const nextAudioPts = this.nextAudioPts;\n // sync with video's timestamp\n const initDTS = this._initDTS;\n const init90kHz = initDTS.baseTime * 90000 / initDTS.timescale;\n const startDTS = (nextAudioPts !== null ? nextAudioPts : videoData.startDTS * inputTimeScale) + init90kHz;\n const endDTS = videoData.endDTS * inputTimeScale + init90kHz;\n // one sample's duration value\n const frameDuration = scaleFactor * AAC_SAMPLES_PER_FRAME;\n // samples count of this segment's duration\n const nbSamples = Math.ceil((endDTS - startDTS) / frameDuration);\n // silent frame\n const silentFrame = AAC.getSilentFrame(track.manifestCodec || track.codec, track.channelCount);\n logger.warn('[mp4-remuxer]: remux empty Audio');\n // Can't remux if we can't generate a silent frame...\n if (!silentFrame) {\n logger.trace('[mp4-remuxer]: Unable to remuxEmptyAudio since we were unable to get a silent frame for given audio codec');\n return;\n }\n const samples = [];\n for (let i = 0; i < nbSamples; i++) {\n const stamp = startDTS + i * frameDuration;\n samples.push({\n unit: silentFrame,\n pts: stamp,\n dts: stamp\n });\n }\n track.samples = samples;\n return this.remuxAudio(track, timeOffset, contiguous, false);\n }\n}\nfunction normalizePts(value, reference) {\n let offset;\n if (reference === null) {\n return value;\n }\n if (reference < value) {\n // - 2^33\n offset = -8589934592;\n } else {\n // + 2^33\n offset = 8589934592;\n }\n /* PTS is 33bit (from 0 to 2^33 -1)\n if diff between value and reference is bigger than half of the amplitude (2^32) then it means that\n PTS looping occured. fill the gap */\n while (Math.abs(value - reference) > 4294967296) {\n value += offset;\n }\n return value;\n}\nfunction findKeyframeIndex(samples) {\n for (let i = 0; i < samples.length; i++) {\n if (samples[i].key) {\n return i;\n }\n }\n return -1;\n}\nfunction flushTextTrackMetadataCueSamples(track, timeOffset, initPTS, initDTS) {\n const length = track.samples.length;\n if (!length) {\n return;\n }\n const inputTimeScale = track.inputTimeScale;\n for (let index = 0; index < length; index++) {\n const sample = track.samples[index];\n // setting id3 pts, dts to relative time\n // using this._initPTS and this._initDTS to calculate relative time\n sample.pts = normalizePts(sample.pts - initPTS.baseTime * inputTimeScale / initPTS.timescale, timeOffset * inputTimeScale) / inputTimeScale;\n sample.dts = normalizePts(sample.dts - initDTS.baseTime * inputTimeScale / initDTS.timescale, timeOffset * inputTimeScale) / inputTimeScale;\n }\n const samples = track.samples;\n track.samples = [];\n return {\n samples\n };\n}\nfunction flushTextTrackUserdataCueSamples(track, timeOffset, initPTS) {\n const length = track.samples.length;\n if (!length) {\n return;\n }\n const inputTimeScale = track.inputTimeScale;\n for (let index = 0; index < length; index++) {\n const sample = track.samples[index];\n // setting text pts, dts to relative time\n // using this._initPTS and this._initDTS to calculate relative time\n sample.pts = normalizePts(sample.pts - initPTS.baseTime * inputTimeScale / initPTS.timescale, timeOffset * inputTimeScale) / inputTimeScale;\n }\n track.samples.sort((a, b) => a.pts - b.pts);\n const samples = track.samples;\n track.samples = [];\n return {\n samples\n };\n}\nclass Mp4Sample {\n constructor(isKeyframe, duration, size, cts) {\n this.size = void 0;\n this.duration = void 0;\n this.cts = void 0;\n this.flags = void 0;\n this.duration = duration;\n this.size = size;\n this.cts = cts;\n this.flags = {\n isLeading: 0,\n isDependedOn: 0,\n hasRedundancy: 0,\n degradPrio: 0,\n dependsOn: isKeyframe ? 2 : 1,\n isNonSync: isKeyframe ? 0 : 1\n };\n }\n}\n\nclass PassThroughRemuxer {\n constructor() {\n this.emitInitSegment = false;\n this.audioCodec = void 0;\n this.videoCodec = void 0;\n this.initData = void 0;\n this.initPTS = null;\n this.initTracks = void 0;\n this.lastEndTime = null;\n }\n destroy() {}\n resetTimeStamp(defaultInitPTS) {\n this.initPTS = defaultInitPTS;\n this.lastEndTime = null;\n }\n resetNextTimestamp() {\n this.lastEndTime = null;\n }\n resetInitSegment(initSegment, audioCodec, videoCodec, decryptdata) {\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this.generateInitSegment(patchEncyptionData(initSegment, decryptdata));\n this.emitInitSegment = true;\n }\n generateInitSegment(initSegment) {\n let {\n audioCodec,\n videoCodec\n } = this;\n if (!(initSegment != null && initSegment.byteLength)) {\n this.initTracks = undefined;\n this.initData = undefined;\n return;\n }\n const initData = this.initData = parseInitSegment(initSegment);\n\n // Get codec from initSegment or fallback to default\n if (initData.audio) {\n audioCodec = getParsedTrackCodec(initData.audio, ElementaryStreamTypes.AUDIO);\n }\n if (initData.video) {\n videoCodec = getParsedTrackCodec(initData.video, ElementaryStreamTypes.VIDEO);\n }\n const tracks = {};\n if (initData.audio && initData.video) {\n tracks.audiovideo = {\n container: 'video/mp4',\n codec: audioCodec + ',' + videoCodec,\n initSegment,\n id: 'main'\n };\n } else if (initData.audio) {\n tracks.audio = {\n container: 'audio/mp4',\n codec: audioCodec,\n initSegment,\n id: 'audio'\n };\n } else if (initData.video) {\n tracks.video = {\n container: 'video/mp4',\n codec: videoCodec,\n initSegment,\n id: 'main'\n };\n } else {\n logger.warn('[passthrough-remuxer.ts]: initSegment does not contain moov or trak boxes.');\n }\n this.initTracks = tracks;\n }\n remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, accurateTimeOffset) {\n var _initData, _initData2;\n let {\n initPTS,\n lastEndTime\n } = this;\n const result = {\n audio: undefined,\n video: undefined,\n text: textTrack,\n id3: id3Track,\n initSegment: undefined\n };\n\n // If we haven't yet set a lastEndDTS, or it was reset, set it to the provided timeOffset. We want to use the\n // lastEndDTS over timeOffset whenever possible; during progressive playback, the media source will not update\n // the media duration (which is what timeOffset is provided as) before we need to process the next chunk.\n if (!isFiniteNumber(lastEndTime)) {\n lastEndTime = this.lastEndTime = timeOffset || 0;\n }\n\n // The binary segment data is added to the videoTrack in the mp4demuxer. We don't check to see if the data is only\n // audio or video (or both); adding it to video was an arbitrary choice.\n const data = videoTrack.samples;\n if (!(data != null && data.length)) {\n return result;\n }\n const initSegment = {\n initPTS: undefined,\n timescale: 1\n };\n let initData = this.initData;\n if (!((_initData = initData) != null && _initData.length)) {\n this.generateInitSegment(data);\n initData = this.initData;\n }\n if (!((_initData2 = initData) != null && _initData2.length)) {\n // We can't remux if the initSegment could not be generated\n logger.warn('[passthrough-remuxer.ts]: Failed to generate initSegment.');\n return result;\n }\n if (this.emitInitSegment) {\n initSegment.tracks = this.initTracks;\n this.emitInitSegment = false;\n }\n const duration = getDuration(data, initData);\n const startDTS = getStartDTS(initData, data);\n const decodeTime = startDTS === null ? timeOffset : startDTS;\n if (isInvalidInitPts(initPTS, decodeTime, timeOffset, duration) || initSegment.timescale !== initPTS.timescale && accurateTimeOffset) {\n initSegment.initPTS = decodeTime - timeOffset;\n if (initPTS && initPTS.timescale === 1) {\n logger.warn(`Adjusting initPTS by ${initSegment.initPTS - initPTS.baseTime}`);\n }\n this.initPTS = initPTS = {\n baseTime: initSegment.initPTS,\n timescale: 1\n };\n }\n const startTime = audioTrack ? decodeTime - initPTS.baseTime / initPTS.timescale : lastEndTime;\n const endTime = startTime + duration;\n offsetStartDTS(initData, data, initPTS.baseTime / initPTS.timescale);\n if (duration > 0) {\n this.lastEndTime = endTime;\n } else {\n logger.warn('Duration parsed from mp4 should be greater than zero');\n this.resetNextTimestamp();\n }\n const hasAudio = !!initData.audio;\n const hasVideo = !!initData.video;\n let type = '';\n if (hasAudio) {\n type += 'audio';\n }\n if (hasVideo) {\n type += 'video';\n }\n const track = {\n data1: data,\n startPTS: startTime,\n startDTS: startTime,\n endPTS: endTime,\n endDTS: endTime,\n type,\n hasAudio,\n hasVideo,\n nb: 1,\n dropped: 0\n };\n result.audio = track.type === 'audio' ? track : undefined;\n result.video = track.type !== 'audio' ? track : undefined;\n result.initSegment = initSegment;\n result.id3 = flushTextTrackMetadataCueSamples(id3Track, timeOffset, initPTS, initPTS);\n if (textTrack.samples.length) {\n result.text = flushTextTrackUserdataCueSamples(textTrack, timeOffset, initPTS);\n }\n return result;\n }\n}\nfunction isInvalidInitPts(initPTS, startDTS, timeOffset, duration) {\n if (initPTS === null) {\n return true;\n }\n // InitPTS is invalid when distance from program would be more than segment duration or a minimum of one second\n const minDuration = Math.max(duration, 1);\n const startTime = startDTS - initPTS.baseTime / initPTS.timescale;\n return Math.abs(startTime - timeOffset) > minDuration;\n}\nfunction getParsedTrackCodec(track, type) {\n const parsedCodec = track == null ? void 0 : track.codec;\n if (parsedCodec && parsedCodec.length > 4) {\n return parsedCodec;\n }\n if (type === ElementaryStreamTypes.AUDIO) {\n if (parsedCodec === 'ec-3' || parsedCodec === 'ac-3' || parsedCodec === 'alac') {\n return parsedCodec;\n }\n if (parsedCodec === 'fLaC' || parsedCodec === 'Opus') {\n // Opting not to get `preferManagedMediaSource` from player config for isSupported() check for simplicity\n const preferManagedMediaSource = false;\n return getCodecCompatibleName(parsedCodec, preferManagedMediaSource);\n }\n const result = 'mp4a.40.5';\n logger.info(`Parsed audio codec \"${parsedCodec}\" or audio object type not handled. Using \"${result}\"`);\n return result;\n }\n // Provide defaults based on codec type\n // This allows for some playback of some fmp4 playlists without CODECS defined in manifest\n logger.warn(`Unhandled video codec \"${parsedCodec}\"`);\n if (parsedCodec === 'hvc1' || parsedCodec === 'hev1') {\n return 'hvc1.1.6.L120.90';\n }\n if (parsedCodec === 'av01') {\n return 'av01.0.04M.08';\n }\n return 'avc1.42e01e';\n}\n\nlet now;\n// performance.now() not available on WebWorker, at least on Safari Desktop\ntry {\n now = self.performance.now.bind(self.performance);\n} catch (err) {\n logger.debug('Unable to use Performance API on this environment');\n now = optionalSelf == null ? void 0 : optionalSelf.Date.now;\n}\nconst muxConfig = [{\n demux: MP4Demuxer,\n remux: PassThroughRemuxer\n}, {\n demux: TSDemuxer,\n remux: MP4Remuxer\n}, {\n demux: AACDemuxer,\n remux: MP4Remuxer\n}, {\n demux: MP3Demuxer,\n remux: MP4Remuxer\n}];\n{\n muxConfig.splice(2, 0, {\n demux: AC3Demuxer,\n remux: MP4Remuxer\n });\n}\nclass Transmuxer {\n constructor(observer, typeSupported, config, vendor, id) {\n this.async = false;\n this.observer = void 0;\n this.typeSupported = void 0;\n this.config = void 0;\n this.vendor = void 0;\n this.id = void 0;\n this.demuxer = void 0;\n this.remuxer = void 0;\n this.decrypter = void 0;\n this.probe = void 0;\n this.decryptionPromise = null;\n this.transmuxConfig = void 0;\n this.currentTransmuxState = void 0;\n this.observer = observer;\n this.typeSupported = typeSupported;\n this.config = config;\n this.vendor = vendor;\n this.id = id;\n }\n configure(transmuxConfig) {\n this.transmuxConfig = transmuxConfig;\n if (this.decrypter) {\n this.decrypter.reset();\n }\n }\n push(data, decryptdata, chunkMeta, state) {\n const stats = chunkMeta.transmuxing;\n stats.executeStart = now();\n let uintData = new Uint8Array(data);\n const {\n currentTransmuxState,\n transmuxConfig\n } = this;\n if (state) {\n this.currentTransmuxState = state;\n }\n const {\n contiguous,\n discontinuity,\n trackSwitch,\n accurateTimeOffset,\n timeOffset,\n initSegmentChange\n } = state || currentTransmuxState;\n const {\n audioCodec,\n videoCodec,\n defaultInitPts,\n duration,\n initSegmentData\n } = transmuxConfig;\n const keyData = getEncryptionType(uintData, decryptdata);\n if (keyData && keyData.method === 'AES-128') {\n const decrypter = this.getDecrypter();\n // Software decryption is synchronous; webCrypto is not\n if (decrypter.isSync()) {\n // Software decryption is progressive. Progressive decryption may not return a result on each call. Any cached\n // data is handled in the flush() call\n let decryptedData = decrypter.softwareDecrypt(uintData, keyData.key.buffer, keyData.iv.buffer);\n // For Low-Latency HLS Parts, decrypt in place, since part parsing is expected on push progress\n const loadingParts = chunkMeta.part > -1;\n if (loadingParts) {\n decryptedData = decrypter.flush();\n }\n if (!decryptedData) {\n stats.executeEnd = now();\n return emptyResult(chunkMeta);\n }\n uintData = new Uint8Array(decryptedData);\n } else {\n this.decryptionPromise = decrypter.webCryptoDecrypt(uintData, keyData.key.buffer, keyData.iv.buffer).then(decryptedData => {\n // Calling push here is important; if flush() is called while this is still resolving, this ensures that\n // the decrypted data has been transmuxed\n const result = this.push(decryptedData, null, chunkMeta);\n this.decryptionPromise = null;\n return result;\n });\n return this.decryptionPromise;\n }\n }\n const resetMuxers = this.needsProbing(discontinuity, trackSwitch);\n if (resetMuxers) {\n const error = this.configureTransmuxer(uintData);\n if (error) {\n logger.warn(`[transmuxer] ${error.message}`);\n this.observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: false,\n error,\n reason: error.message\n });\n stats.executeEnd = now();\n return emptyResult(chunkMeta);\n }\n }\n if (discontinuity || trackSwitch || initSegmentChange || resetMuxers) {\n this.resetInitSegment(initSegmentData, audioCodec, videoCodec, duration, decryptdata);\n }\n if (discontinuity || initSegmentChange || resetMuxers) {\n this.resetInitialTimestamp(defaultInitPts);\n }\n if (!contiguous) {\n this.resetContiguity();\n }\n const result = this.transmux(uintData, keyData, timeOffset, accurateTimeOffset, chunkMeta);\n const currentState = this.currentTransmuxState;\n currentState.contiguous = true;\n currentState.discontinuity = false;\n currentState.trackSwitch = false;\n stats.executeEnd = now();\n return result;\n }\n\n // Due to data caching, flush calls can produce more than one TransmuxerResult (hence the Array type)\n flush(chunkMeta) {\n const stats = chunkMeta.transmuxing;\n stats.executeStart = now();\n const {\n decrypter,\n currentTransmuxState,\n decryptionPromise\n } = this;\n if (decryptionPromise) {\n // Upon resolution, the decryption promise calls push() and returns its TransmuxerResult up the stack. Therefore\n // only flushing is required for async decryption\n return decryptionPromise.then(() => {\n return this.flush(chunkMeta);\n });\n }\n const transmuxResults = [];\n const {\n timeOffset\n } = currentTransmuxState;\n if (decrypter) {\n // The decrypter may have data cached, which needs to be demuxed. In this case we'll have two TransmuxResults\n // This happens in the case that we receive only 1 push call for a segment (either for non-progressive downloads,\n // or for progressive downloads with small segments)\n const decryptedData = decrypter.flush();\n if (decryptedData) {\n // Push always returns a TransmuxerResult if decryptdata is null\n transmuxResults.push(this.push(decryptedData, null, chunkMeta));\n }\n }\n const {\n demuxer,\n remuxer\n } = this;\n if (!demuxer || !remuxer) {\n // If probing failed, then Hls.js has been given content its not able to handle\n stats.executeEnd = now();\n return [emptyResult(chunkMeta)];\n }\n const demuxResultOrPromise = demuxer.flush(timeOffset);\n if (isPromise(demuxResultOrPromise)) {\n // Decrypt final SAMPLE-AES samples\n return demuxResultOrPromise.then(demuxResult => {\n this.flushRemux(transmuxResults, demuxResult, chunkMeta);\n return transmuxResults;\n });\n }\n this.flushRemux(transmuxResults, demuxResultOrPromise, chunkMeta);\n return transmuxResults;\n }\n flushRemux(transmuxResults, demuxResult, chunkMeta) {\n const {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack\n } = demuxResult;\n const {\n accurateTimeOffset,\n timeOffset\n } = this.currentTransmuxState;\n logger.log(`[transmuxer.ts]: Flushed fragment ${chunkMeta.sn}${chunkMeta.part > -1 ? ' p: ' + chunkMeta.part : ''} of level ${chunkMeta.level}`);\n const remuxResult = this.remuxer.remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, accurateTimeOffset, true, this.id);\n transmuxResults.push({\n remuxResult,\n chunkMeta\n });\n chunkMeta.transmuxing.executeEnd = now();\n }\n resetInitialTimestamp(defaultInitPts) {\n const {\n demuxer,\n remuxer\n } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetTimeStamp(defaultInitPts);\n remuxer.resetTimeStamp(defaultInitPts);\n }\n resetContiguity() {\n const {\n demuxer,\n remuxer\n } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetContiguity();\n remuxer.resetNextTimestamp();\n }\n resetInitSegment(initSegmentData, audioCodec, videoCodec, trackDuration, decryptdata) {\n const {\n demuxer,\n remuxer\n } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetInitSegment(initSegmentData, audioCodec, videoCodec, trackDuration);\n remuxer.resetInitSegment(initSegmentData, audioCodec, videoCodec, decryptdata);\n }\n destroy() {\n if (this.demuxer) {\n this.demuxer.destroy();\n this.demuxer = undefined;\n }\n if (this.remuxer) {\n this.remuxer.destroy();\n this.remuxer = undefined;\n }\n }\n transmux(data, keyData, timeOffset, accurateTimeOffset, chunkMeta) {\n let result;\n if (keyData && keyData.method === 'SAMPLE-AES') {\n result = this.transmuxSampleAes(data, keyData, timeOffset, accurateTimeOffset, chunkMeta);\n } else {\n result = this.transmuxUnencrypted(data, timeOffset, accurateTimeOffset, chunkMeta);\n }\n return result;\n }\n transmuxUnencrypted(data, timeOffset, accurateTimeOffset, chunkMeta) {\n const {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack\n } = this.demuxer.demux(data, timeOffset, false, !this.config.progressive);\n const remuxResult = this.remuxer.remux(audioTrack, videoTrack, id3Track, textTrack, timeOffset, accurateTimeOffset, false, this.id);\n return {\n remuxResult,\n chunkMeta\n };\n }\n transmuxSampleAes(data, decryptData, timeOffset, accurateTimeOffset, chunkMeta) {\n return this.demuxer.demuxSampleAes(data, decryptData, timeOffset).then(demuxResult => {\n const remuxResult = this.remuxer.remux(demuxResult.audioTrack, demuxResult.videoTrack, demuxResult.id3Track, demuxResult.textTrack, timeOffset, accurateTimeOffset, false, this.id);\n return {\n remuxResult,\n chunkMeta\n };\n });\n }\n configureTransmuxer(data) {\n const {\n config,\n observer,\n typeSupported,\n vendor\n } = this;\n // probe for content type\n let mux;\n for (let i = 0, len = muxConfig.length; i < len; i++) {\n var _muxConfig$i$demux;\n if ((_muxConfig$i$demux = muxConfig[i].demux) != null && _muxConfig$i$demux.probe(data)) {\n mux = muxConfig[i];\n break;\n }\n }\n if (!mux) {\n return new Error('Failed to find demuxer by probing fragment data');\n }\n // so let's check that current remuxer and demuxer are still valid\n const demuxer = this.demuxer;\n const remuxer = this.remuxer;\n const Remuxer = mux.remux;\n const Demuxer = mux.demux;\n if (!remuxer || !(remuxer instanceof Remuxer)) {\n this.remuxer = new Remuxer(observer, config, typeSupported, vendor);\n }\n if (!demuxer || !(demuxer instanceof Demuxer)) {\n this.demuxer = new Demuxer(observer, config, typeSupported);\n this.probe = Demuxer.probe;\n }\n }\n needsProbing(discontinuity, trackSwitch) {\n // in case of continuity change, or track switch\n // we might switch from content type (AAC container to TS container, or TS to fmp4 for example)\n return !this.demuxer || !this.remuxer || discontinuity || trackSwitch;\n }\n getDecrypter() {\n let decrypter = this.decrypter;\n if (!decrypter) {\n decrypter = this.decrypter = new Decrypter(this.config);\n }\n return decrypter;\n }\n}\nfunction getEncryptionType(data, decryptData) {\n let encryptionType = null;\n if (data.byteLength > 0 && (decryptData == null ? void 0 : decryptData.key) != null && decryptData.iv !== null && decryptData.method != null) {\n encryptionType = decryptData;\n }\n return encryptionType;\n}\nconst emptyResult = chunkMeta => ({\n remuxResult: {},\n chunkMeta\n});\nfunction isPromise(p) {\n return 'then' in p && p.then instanceof Function;\n}\nclass TransmuxConfig {\n constructor(audioCodec, videoCodec, initSegmentData, duration, defaultInitPts) {\n this.audioCodec = void 0;\n this.videoCodec = void 0;\n this.initSegmentData = void 0;\n this.duration = void 0;\n this.defaultInitPts = void 0;\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this.initSegmentData = initSegmentData;\n this.duration = duration;\n this.defaultInitPts = defaultInitPts || null;\n }\n}\nclass TransmuxState {\n constructor(discontinuity, contiguous, accurateTimeOffset, trackSwitch, timeOffset, initSegmentChange) {\n this.discontinuity = void 0;\n this.contiguous = void 0;\n this.accurateTimeOffset = void 0;\n this.trackSwitch = void 0;\n this.timeOffset = void 0;\n this.initSegmentChange = void 0;\n this.discontinuity = discontinuity;\n this.contiguous = contiguous;\n this.accurateTimeOffset = accurateTimeOffset;\n this.trackSwitch = trackSwitch;\n this.timeOffset = timeOffset;\n this.initSegmentChange = initSegmentChange;\n }\n}\n\nvar eventemitter3 = {exports: {}};\n\n(function (module) {\n\n\tvar has = Object.prototype.hasOwnProperty\n\t , prefix = '~';\n\n\t/**\n\t * Constructor to create a storage for our `EE` objects.\n\t * An `Events` instance is a plain object whose properties are event names.\n\t *\n\t * @constructor\n\t * @private\n\t */\n\tfunction Events() {}\n\n\t//\n\t// We try to not inherit from `Object.prototype`. In some engines creating an\n\t// instance in this way is faster than calling `Object.create(null)` directly.\n\t// If `Object.create(null)` is not supported we prefix the event names with a\n\t// character to make sure that the built-in object properties are not\n\t// overridden or used as an attack vector.\n\t//\n\tif (Object.create) {\n\t Events.prototype = Object.create(null);\n\n\t //\n\t // This hack is needed because the `__proto__` property is still inherited in\n\t // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.\n\t //\n\t if (!new Events().__proto__) prefix = false;\n\t}\n\n\t/**\n\t * Representation of a single event listener.\n\t *\n\t * @param {Function} fn The listener function.\n\t * @param {*} context The context to invoke the listener with.\n\t * @param {Boolean} [once=false] Specify if the listener is a one-time listener.\n\t * @constructor\n\t * @private\n\t */\n\tfunction EE(fn, context, once) {\n\t this.fn = fn;\n\t this.context = context;\n\t this.once = once || false;\n\t}\n\n\t/**\n\t * Add a listener for a given event.\n\t *\n\t * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n\t * @param {(String|Symbol)} event The event name.\n\t * @param {Function} fn The listener function.\n\t * @param {*} context The context to invoke the listener with.\n\t * @param {Boolean} once Specify if the listener is a one-time listener.\n\t * @returns {EventEmitter}\n\t * @private\n\t */\n\tfunction addListener(emitter, event, fn, context, once) {\n\t if (typeof fn !== 'function') {\n\t throw new TypeError('The listener must be a function');\n\t }\n\n\t var listener = new EE(fn, context || emitter, once)\n\t , evt = prefix ? prefix + event : event;\n\n\t if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;\n\t else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);\n\t else emitter._events[evt] = [emitter._events[evt], listener];\n\n\t return emitter;\n\t}\n\n\t/**\n\t * Clear event by name.\n\t *\n\t * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n\t * @param {(String|Symbol)} evt The Event name.\n\t * @private\n\t */\n\tfunction clearEvent(emitter, evt) {\n\t if (--emitter._eventsCount === 0) emitter._events = new Events();\n\t else delete emitter._events[evt];\n\t}\n\n\t/**\n\t * Minimal `EventEmitter` interface that is molded against the Node.js\n\t * `EventEmitter` interface.\n\t *\n\t * @constructor\n\t * @public\n\t */\n\tfunction EventEmitter() {\n\t this._events = new Events();\n\t this._eventsCount = 0;\n\t}\n\n\t/**\n\t * Return an array listing the events for which the emitter has registered\n\t * listeners.\n\t *\n\t * @returns {Array}\n\t * @public\n\t */\n\tEventEmitter.prototype.eventNames = function eventNames() {\n\t var names = []\n\t , events\n\t , name;\n\n\t if (this._eventsCount === 0) return names;\n\n\t for (name in (events = this._events)) {\n\t if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);\n\t }\n\n\t if (Object.getOwnPropertySymbols) {\n\t return names.concat(Object.getOwnPropertySymbols(events));\n\t }\n\n\t return names;\n\t};\n\n\t/**\n\t * Return the listeners registered for a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @returns {Array} The registered listeners.\n\t * @public\n\t */\n\tEventEmitter.prototype.listeners = function listeners(event) {\n\t var evt = prefix ? prefix + event : event\n\t , handlers = this._events[evt];\n\n\t if (!handlers) return [];\n\t if (handlers.fn) return [handlers.fn];\n\n\t for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {\n\t ee[i] = handlers[i].fn;\n\t }\n\n\t return ee;\n\t};\n\n\t/**\n\t * Return the number of listeners listening to a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @returns {Number} The number of listeners.\n\t * @public\n\t */\n\tEventEmitter.prototype.listenerCount = function listenerCount(event) {\n\t var evt = prefix ? prefix + event : event\n\t , listeners = this._events[evt];\n\n\t if (!listeners) return 0;\n\t if (listeners.fn) return 1;\n\t return listeners.length;\n\t};\n\n\t/**\n\t * Calls each of the listeners registered for a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @returns {Boolean} `true` if the event had listeners, else `false`.\n\t * @public\n\t */\n\tEventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {\n\t var evt = prefix ? prefix + event : event;\n\n\t if (!this._events[evt]) return false;\n\n\t var listeners = this._events[evt]\n\t , len = arguments.length\n\t , args\n\t , i;\n\n\t if (listeners.fn) {\n\t if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);\n\n\t switch (len) {\n\t case 1: return listeners.fn.call(listeners.context), true;\n\t case 2: return listeners.fn.call(listeners.context, a1), true;\n\t case 3: return listeners.fn.call(listeners.context, a1, a2), true;\n\t case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;\n\t case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;\n\t case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;\n\t }\n\n\t for (i = 1, args = new Array(len -1); i < len; i++) {\n\t args[i - 1] = arguments[i];\n\t }\n\n\t listeners.fn.apply(listeners.context, args);\n\t } else {\n\t var length = listeners.length\n\t , j;\n\n\t for (i = 0; i < length; i++) {\n\t if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);\n\n\t switch (len) {\n\t case 1: listeners[i].fn.call(listeners[i].context); break;\n\t case 2: listeners[i].fn.call(listeners[i].context, a1); break;\n\t case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;\n\t case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;\n\t default:\n\t if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {\n\t args[j - 1] = arguments[j];\n\t }\n\n\t listeners[i].fn.apply(listeners[i].context, args);\n\t }\n\t }\n\t }\n\n\t return true;\n\t};\n\n\t/**\n\t * Add a listener for a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @param {Function} fn The listener function.\n\t * @param {*} [context=this] The context to invoke the listener with.\n\t * @returns {EventEmitter} `this`.\n\t * @public\n\t */\n\tEventEmitter.prototype.on = function on(event, fn, context) {\n\t return addListener(this, event, fn, context, false);\n\t};\n\n\t/**\n\t * Add a one-time listener for a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @param {Function} fn The listener function.\n\t * @param {*} [context=this] The context to invoke the listener with.\n\t * @returns {EventEmitter} `this`.\n\t * @public\n\t */\n\tEventEmitter.prototype.once = function once(event, fn, context) {\n\t return addListener(this, event, fn, context, true);\n\t};\n\n\t/**\n\t * Remove the listeners of a given event.\n\t *\n\t * @param {(String|Symbol)} event The event name.\n\t * @param {Function} fn Only remove the listeners that match this function.\n\t * @param {*} context Only remove the listeners that have this context.\n\t * @param {Boolean} once Only remove one-time listeners.\n\t * @returns {EventEmitter} `this`.\n\t * @public\n\t */\n\tEventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {\n\t var evt = prefix ? prefix + event : event;\n\n\t if (!this._events[evt]) return this;\n\t if (!fn) {\n\t clearEvent(this, evt);\n\t return this;\n\t }\n\n\t var listeners = this._events[evt];\n\n\t if (listeners.fn) {\n\t if (\n\t listeners.fn === fn &&\n\t (!once || listeners.once) &&\n\t (!context || listeners.context === context)\n\t ) {\n\t clearEvent(this, evt);\n\t }\n\t } else {\n\t for (var i = 0, events = [], length = listeners.length; i < length; i++) {\n\t if (\n\t listeners[i].fn !== fn ||\n\t (once && !listeners[i].once) ||\n\t (context && listeners[i].context !== context)\n\t ) {\n\t events.push(listeners[i]);\n\t }\n\t }\n\n\t //\n\t // Reset the array, or remove it completely if we have no more listeners.\n\t //\n\t if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;\n\t else clearEvent(this, evt);\n\t }\n\n\t return this;\n\t};\n\n\t/**\n\t * Remove all listeners, or those of the specified event.\n\t *\n\t * @param {(String|Symbol)} [event] The event name.\n\t * @returns {EventEmitter} `this`.\n\t * @public\n\t */\n\tEventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {\n\t var evt;\n\n\t if (event) {\n\t evt = prefix ? prefix + event : event;\n\t if (this._events[evt]) clearEvent(this, evt);\n\t } else {\n\t this._events = new Events();\n\t this._eventsCount = 0;\n\t }\n\n\t return this;\n\t};\n\n\t//\n\t// Alias methods names because people roll like that.\n\t//\n\tEventEmitter.prototype.off = EventEmitter.prototype.removeListener;\n\tEventEmitter.prototype.addListener = EventEmitter.prototype.on;\n\n\t//\n\t// Expose the prefix.\n\t//\n\tEventEmitter.prefixed = prefix;\n\n\t//\n\t// Allow `EventEmitter` to be imported as module namespace.\n\t//\n\tEventEmitter.EventEmitter = EventEmitter;\n\n\t//\n\t// Expose the module.\n\t//\n\t{\n\t module.exports = EventEmitter;\n\t} \n} (eventemitter3));\n\nvar eventemitter3Exports = eventemitter3.exports;\nvar EventEmitter = /*@__PURE__*/getDefaultExportFromCjs(eventemitter3Exports);\n\nclass TransmuxerInterface {\n constructor(hls, id, onTransmuxComplete, onFlush) {\n this.error = null;\n this.hls = void 0;\n this.id = void 0;\n this.observer = void 0;\n this.frag = null;\n this.part = null;\n this.useWorker = void 0;\n this.workerContext = null;\n this.onwmsg = void 0;\n this.transmuxer = null;\n this.onTransmuxComplete = void 0;\n this.onFlush = void 0;\n const config = hls.config;\n this.hls = hls;\n this.id = id;\n this.useWorker = !!config.enableWorker;\n this.onTransmuxComplete = onTransmuxComplete;\n this.onFlush = onFlush;\n const forwardMessage = (ev, data) => {\n data = data || {};\n data.frag = this.frag;\n data.id = this.id;\n if (ev === Events.ERROR) {\n this.error = data.error;\n }\n this.hls.trigger(ev, data);\n };\n\n // forward events to main thread\n this.observer = new EventEmitter();\n this.observer.on(Events.FRAG_DECRYPTED, forwardMessage);\n this.observer.on(Events.ERROR, forwardMessage);\n const MediaSource = getMediaSource(config.preferManagedMediaSource) || {\n isTypeSupported: () => false\n };\n const m2tsTypeSupported = {\n mpeg: MediaSource.isTypeSupported('audio/mpeg'),\n mp3: MediaSource.isTypeSupported('audio/mp4; codecs=\"mp3\"'),\n ac3: MediaSource.isTypeSupported('audio/mp4; codecs=\"ac-3\"') \n };\n if (this.useWorker && typeof Worker !== 'undefined') {\n const canCreateWorker = config.workerPath || hasUMDWorker();\n if (canCreateWorker) {\n try {\n if (config.workerPath) {\n logger.log(`loading Web Worker ${config.workerPath} for \"${id}\"`);\n this.workerContext = loadWorker(config.workerPath);\n } else {\n logger.log(`injecting Web Worker for \"${id}\"`);\n this.workerContext = injectWorker();\n }\n this.onwmsg = event => this.onWorkerMessage(event);\n const {\n worker\n } = this.workerContext;\n worker.addEventListener('message', this.onwmsg);\n worker.onerror = event => {\n const error = new Error(`${event.message} (${event.filename}:${event.lineno})`);\n config.enableWorker = false;\n logger.warn(`Error in \"${id}\" Web Worker, fallback to inline`);\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.OTHER_ERROR,\n details: ErrorDetails.INTERNAL_EXCEPTION,\n fatal: false,\n event: 'demuxerWorker',\n error\n });\n };\n worker.postMessage({\n cmd: 'init',\n typeSupported: m2tsTypeSupported,\n vendor: '',\n id: id,\n config: JSON.stringify(config)\n });\n } catch (err) {\n logger.warn(`Error setting up \"${id}\" Web Worker, fallback to inline`, err);\n this.resetWorker();\n this.error = null;\n this.transmuxer = new Transmuxer(this.observer, m2tsTypeSupported, config, '', id);\n }\n return;\n }\n }\n this.transmuxer = new Transmuxer(this.observer, m2tsTypeSupported, config, '', id);\n }\n resetWorker() {\n if (this.workerContext) {\n const {\n worker,\n objectURL\n } = this.workerContext;\n if (objectURL) {\n // revoke the Object URL that was used to create transmuxer worker, so as not to leak it\n self.URL.revokeObjectURL(objectURL);\n }\n worker.removeEventListener('message', this.onwmsg);\n worker.onerror = null;\n worker.terminate();\n this.workerContext = null;\n }\n }\n destroy() {\n if (this.workerContext) {\n this.resetWorker();\n this.onwmsg = undefined;\n } else {\n const transmuxer = this.transmuxer;\n if (transmuxer) {\n transmuxer.destroy();\n this.transmuxer = null;\n }\n }\n const observer = this.observer;\n if (observer) {\n observer.removeAllListeners();\n }\n this.frag = null;\n // @ts-ignore\n this.observer = null;\n // @ts-ignore\n this.hls = null;\n }\n push(data, initSegmentData, audioCodec, videoCodec, frag, part, duration, accurateTimeOffset, chunkMeta, defaultInitPTS) {\n var _frag$initSegment, _lastFrag$initSegment;\n chunkMeta.transmuxing.start = self.performance.now();\n const {\n transmuxer\n } = this;\n const timeOffset = part ? part.start : frag.start;\n // TODO: push \"clear-lead\" decrypt data for unencrypted fragments in streams with encrypted ones\n const decryptdata = frag.decryptdata;\n const lastFrag = this.frag;\n const discontinuity = !(lastFrag && frag.cc === lastFrag.cc);\n const trackSwitch = !(lastFrag && chunkMeta.level === lastFrag.level);\n const snDiff = lastFrag ? chunkMeta.sn - lastFrag.sn : -1;\n const partDiff = this.part ? chunkMeta.part - this.part.index : -1;\n const progressive = snDiff === 0 && chunkMeta.id > 1 && chunkMeta.id === (lastFrag == null ? void 0 : lastFrag.stats.chunkCount);\n const contiguous = !trackSwitch && (snDiff === 1 || snDiff === 0 && (partDiff === 1 || progressive && partDiff <= 0));\n const now = self.performance.now();\n if (trackSwitch || snDiff || frag.stats.parsing.start === 0) {\n frag.stats.parsing.start = now;\n }\n if (part && (partDiff || !contiguous)) {\n part.stats.parsing.start = now;\n }\n const initSegmentChange = !(lastFrag && ((_frag$initSegment = frag.initSegment) == null ? void 0 : _frag$initSegment.url) === ((_lastFrag$initSegment = lastFrag.initSegment) == null ? void 0 : _lastFrag$initSegment.url));\n const state = new TransmuxState(discontinuity, contiguous, accurateTimeOffset, trackSwitch, timeOffset, initSegmentChange);\n if (!contiguous || discontinuity || initSegmentChange) {\n logger.log(`[transmuxer-interface, ${frag.type}]: Starting new transmux session for sn: ${chunkMeta.sn} p: ${chunkMeta.part} level: ${chunkMeta.level} id: ${chunkMeta.id}\n discontinuity: ${discontinuity}\n trackSwitch: ${trackSwitch}\n contiguous: ${contiguous}\n accurateTimeOffset: ${accurateTimeOffset}\n timeOffset: ${timeOffset}\n initSegmentChange: ${initSegmentChange}`);\n const config = new TransmuxConfig(audioCodec, videoCodec, initSegmentData, duration, defaultInitPTS);\n this.configureTransmuxer(config);\n }\n this.frag = frag;\n this.part = part;\n\n // Frags with sn of 'initSegment' are not transmuxed\n if (this.workerContext) {\n // post fragment payload as transferable objects for ArrayBuffer (no copy)\n this.workerContext.worker.postMessage({\n cmd: 'demux',\n data,\n decryptdata,\n chunkMeta,\n state\n }, data instanceof ArrayBuffer ? [data] : []);\n } else if (transmuxer) {\n const transmuxResult = transmuxer.push(data, decryptdata, chunkMeta, state);\n if (isPromise(transmuxResult)) {\n transmuxer.async = true;\n transmuxResult.then(data => {\n this.handleTransmuxComplete(data);\n }).catch(error => {\n this.transmuxerError(error, chunkMeta, 'transmuxer-interface push error');\n });\n } else {\n transmuxer.async = false;\n this.handleTransmuxComplete(transmuxResult);\n }\n }\n }\n flush(chunkMeta) {\n chunkMeta.transmuxing.start = self.performance.now();\n const {\n transmuxer\n } = this;\n if (this.workerContext) {\n this.workerContext.worker.postMessage({\n cmd: 'flush',\n chunkMeta\n });\n } else if (transmuxer) {\n let transmuxResult = transmuxer.flush(chunkMeta);\n const asyncFlush = isPromise(transmuxResult);\n if (asyncFlush || transmuxer.async) {\n if (!isPromise(transmuxResult)) {\n transmuxResult = Promise.resolve(transmuxResult);\n }\n transmuxResult.then(data => {\n this.handleFlushResult(data, chunkMeta);\n }).catch(error => {\n this.transmuxerError(error, chunkMeta, 'transmuxer-interface flush error');\n });\n } else {\n this.handleFlushResult(transmuxResult, chunkMeta);\n }\n }\n }\n transmuxerError(error, chunkMeta, reason) {\n if (!this.hls) {\n return;\n }\n this.error = error;\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n chunkMeta,\n frag: this.frag || undefined,\n fatal: false,\n error,\n err: error,\n reason\n });\n }\n handleFlushResult(results, chunkMeta) {\n results.forEach(result => {\n this.handleTransmuxComplete(result);\n });\n this.onFlush(chunkMeta);\n }\n onWorkerMessage(event) {\n const data = event.data;\n if (!(data != null && data.event)) {\n logger.warn(`worker message received with no ${data ? 'event name' : 'data'}`);\n return;\n }\n const hls = this.hls;\n if (!this.hls) {\n return;\n }\n switch (data.event) {\n case 'init':\n {\n var _this$workerContext;\n const objectURL = (_this$workerContext = this.workerContext) == null ? void 0 : _this$workerContext.objectURL;\n if (objectURL) {\n // revoke the Object URL that was used to create transmuxer worker, so as not to leak it\n self.URL.revokeObjectURL(objectURL);\n }\n break;\n }\n case 'transmuxComplete':\n {\n this.handleTransmuxComplete(data.data);\n break;\n }\n case 'flush':\n {\n this.onFlush(data.data);\n break;\n }\n\n // pass logs from the worker thread to the main logger\n case 'workerLog':\n if (logger[data.data.logType]) {\n logger[data.data.logType](data.data.message);\n }\n break;\n default:\n {\n data.data = data.data || {};\n data.data.frag = this.frag;\n data.data.id = this.id;\n hls.trigger(data.event, data.data);\n break;\n }\n }\n }\n configureTransmuxer(config) {\n const {\n transmuxer\n } = this;\n if (this.workerContext) {\n this.workerContext.worker.postMessage({\n cmd: 'configure',\n config\n });\n } else if (transmuxer) {\n transmuxer.configure(config);\n }\n }\n handleTransmuxComplete(result) {\n result.chunkMeta.transmuxing.end = self.performance.now();\n this.onTransmuxComplete(result);\n }\n}\n\nfunction subtitleOptionsIdentical(trackList1, trackList2) {\n if (trackList1.length !== trackList2.length) {\n return false;\n }\n for (let i = 0; i < trackList1.length; i++) {\n if (!mediaAttributesIdentical(trackList1[i].attrs, trackList2[i].attrs)) {\n return false;\n }\n }\n return true;\n}\nfunction mediaAttributesIdentical(attrs1, attrs2, customAttributes) {\n // Media options with the same rendition ID must be bit identical\n const stableRenditionId = attrs1['STABLE-RENDITION-ID'];\n if (stableRenditionId && !customAttributes) {\n return stableRenditionId === attrs2['STABLE-RENDITION-ID'];\n }\n // When rendition ID is not present, compare attributes\n return !(customAttributes || ['LANGUAGE', 'NAME', 'CHARACTERISTICS', 'AUTOSELECT', 'DEFAULT', 'FORCED', 'ASSOC-LANGUAGE']).some(subtitleAttribute => attrs1[subtitleAttribute] !== attrs2[subtitleAttribute]);\n}\nfunction subtitleTrackMatchesTextTrack(subtitleTrack, textTrack) {\n return textTrack.label.toLowerCase() === subtitleTrack.name.toLowerCase() && (!textTrack.language || textTrack.language.toLowerCase() === (subtitleTrack.lang || '').toLowerCase());\n}\n\nconst TICK_INTERVAL$2 = 100; // how often to tick in ms\n\nclass AudioStreamController extends BaseStreamController {\n constructor(hls, fragmentTracker, keyLoader) {\n super(hls, fragmentTracker, keyLoader, '[audio-stream-controller]', PlaylistLevelType.AUDIO);\n this.videoBuffer = null;\n this.videoTrackCC = -1;\n this.waitingVideoCC = -1;\n this.bufferedTrack = null;\n this.switchingTrack = null;\n this.trackId = -1;\n this.waitingData = null;\n this.mainDetails = null;\n this.flushing = false;\n this.bufferFlushed = false;\n this.cachedTrackLoadedData = null;\n this._registerListeners();\n }\n onHandlerDestroying() {\n this._unregisterListeners();\n super.onHandlerDestroying();\n this.mainDetails = null;\n this.bufferedTrack = null;\n this.switchingTrack = null;\n }\n _registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.on(Events.AUDIO_TRACKS_UPDATED, this.onAudioTracksUpdated, this);\n hls.on(Events.AUDIO_TRACK_SWITCHING, this.onAudioTrackSwitching, this);\n hls.on(Events.AUDIO_TRACK_LOADED, this.onAudioTrackLoaded, this);\n hls.on(Events.ERROR, this.onError, this);\n hls.on(Events.BUFFER_RESET, this.onBufferReset, this);\n hls.on(Events.BUFFER_CREATED, this.onBufferCreated, this);\n hls.on(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.on(Events.BUFFER_FLUSHED, this.onBufferFlushed, this);\n hls.on(Events.INIT_PTS_FOUND, this.onInitPtsFound, this);\n hls.on(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n }\n _unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.off(Events.AUDIO_TRACKS_UPDATED, this.onAudioTracksUpdated, this);\n hls.off(Events.AUDIO_TRACK_SWITCHING, this.onAudioTrackSwitching, this);\n hls.off(Events.AUDIO_TRACK_LOADED, this.onAudioTrackLoaded, this);\n hls.off(Events.ERROR, this.onError, this);\n hls.off(Events.BUFFER_RESET, this.onBufferReset, this);\n hls.off(Events.BUFFER_CREATED, this.onBufferCreated, this);\n hls.off(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.off(Events.BUFFER_FLUSHED, this.onBufferFlushed, this);\n hls.off(Events.INIT_PTS_FOUND, this.onInitPtsFound, this);\n hls.off(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n }\n\n // INIT_PTS_FOUND is triggered when the video track parsed in the stream-controller has a new PTS value\n onInitPtsFound(event, {\n frag,\n id,\n initPTS,\n timescale\n }) {\n // Always update the new INIT PTS\n // Can change due level switch\n if (id === 'main') {\n const cc = frag.cc;\n this.initPTS[frag.cc] = {\n baseTime: initPTS,\n timescale\n };\n this.log(`InitPTS for cc: ${cc} found from main: ${initPTS}`);\n this.videoTrackCC = cc;\n // If we are waiting, tick immediately to unblock audio fragment transmuxing\n if (this.state === State.WAITING_INIT_PTS) {\n this.tick();\n }\n }\n }\n startLoad(startPosition) {\n if (!this.levels) {\n this.startPosition = startPosition;\n this.state = State.STOPPED;\n return;\n }\n const lastCurrentTime = this.lastCurrentTime;\n this.stopLoad();\n this.setInterval(TICK_INTERVAL$2);\n if (lastCurrentTime > 0 && startPosition === -1) {\n this.log(`Override startPosition with lastCurrentTime @${lastCurrentTime.toFixed(3)}`);\n startPosition = lastCurrentTime;\n this.state = State.IDLE;\n } else {\n this.loadedmetadata = false;\n this.state = State.WAITING_TRACK;\n }\n this.nextLoadPosition = this.startPosition = this.lastCurrentTime = startPosition;\n this.tick();\n }\n doTick() {\n switch (this.state) {\n case State.IDLE:\n this.doTickIdle();\n break;\n case State.WAITING_TRACK:\n {\n var _levels$trackId;\n const {\n levels,\n trackId\n } = this;\n const details = levels == null ? void 0 : (_levels$trackId = levels[trackId]) == null ? void 0 : _levels$trackId.details;\n if (details) {\n if (this.waitForCdnTuneIn(details)) {\n break;\n }\n this.state = State.WAITING_INIT_PTS;\n }\n break;\n }\n case State.FRAG_LOADING_WAITING_RETRY:\n {\n var _this$media;\n const now = performance.now();\n const retryDate = this.retryDate;\n // if current time is gt than retryDate, or if media seeking let's switch to IDLE state to retry loading\n if (!retryDate || now >= retryDate || (_this$media = this.media) != null && _this$media.seeking) {\n const {\n levels,\n trackId\n } = this;\n this.log('RetryDate reached, switch back to IDLE state');\n this.resetStartWhenNotLoaded((levels == null ? void 0 : levels[trackId]) || null);\n this.state = State.IDLE;\n }\n break;\n }\n case State.WAITING_INIT_PTS:\n {\n // Ensure we don't get stuck in the WAITING_INIT_PTS state if the waiting frag CC doesn't match any initPTS\n const waitingData = this.waitingData;\n if (waitingData) {\n const {\n frag,\n part,\n cache,\n complete\n } = waitingData;\n if (this.initPTS[frag.cc] !== undefined) {\n this.waitingData = null;\n this.waitingVideoCC = -1;\n this.state = State.FRAG_LOADING;\n const payload = cache.flush();\n const data = {\n frag,\n part,\n payload,\n networkDetails: null\n };\n this._handleFragmentLoadProgress(data);\n if (complete) {\n super._handleFragmentLoadComplete(data);\n }\n } else if (this.videoTrackCC !== this.waitingVideoCC) {\n // Drop waiting fragment if videoTrackCC has changed since waitingFragment was set and initPTS was not found\n this.log(`Waiting fragment cc (${frag.cc}) cancelled because video is at cc ${this.videoTrackCC}`);\n this.clearWaitingFragment();\n } else {\n // Drop waiting fragment if an earlier fragment is needed\n const pos = this.getLoadPosition();\n const bufferInfo = BufferHelper.bufferInfo(this.mediaBuffer, pos, this.config.maxBufferHole);\n const waitingFragmentAtPosition = fragmentWithinToleranceTest(bufferInfo.end, this.config.maxFragLookUpTolerance, frag);\n if (waitingFragmentAtPosition < 0) {\n this.log(`Waiting fragment cc (${frag.cc}) @ ${frag.start} cancelled because another fragment at ${bufferInfo.end} is needed`);\n this.clearWaitingFragment();\n }\n }\n } else {\n this.state = State.IDLE;\n }\n }\n }\n this.onTickEnd();\n }\n clearWaitingFragment() {\n const waitingData = this.waitingData;\n if (waitingData) {\n this.fragmentTracker.removeFragment(waitingData.frag);\n this.waitingData = null;\n this.waitingVideoCC = -1;\n this.state = State.IDLE;\n }\n }\n resetLoadingState() {\n this.clearWaitingFragment();\n super.resetLoadingState();\n }\n onTickEnd() {\n const {\n media\n } = this;\n if (!(media != null && media.readyState)) {\n // Exit early if we don't have media or if the media hasn't buffered anything yet (readyState 0)\n return;\n }\n this.lastCurrentTime = media.currentTime;\n }\n doTickIdle() {\n const {\n hls,\n levels,\n media,\n trackId\n } = this;\n const config = hls.config;\n\n // 1. if video not attached AND\n // start fragment already requested OR start frag prefetch not enabled\n // 2. if tracks or track not loaded and selected\n // then exit loop\n // => if media not attached but start frag prefetch is enabled and start frag not requested yet, we will not exit loop\n if (!media && (this.startFragRequested || !config.startFragPrefetch) || !(levels != null && levels[trackId])) {\n return;\n }\n const levelInfo = levels[trackId];\n const trackDetails = levelInfo.details;\n if (!trackDetails || trackDetails.live && this.levelLastLoaded !== levelInfo || this.waitForCdnTuneIn(trackDetails)) {\n this.state = State.WAITING_TRACK;\n return;\n }\n const bufferable = this.mediaBuffer ? this.mediaBuffer : this.media;\n if (this.bufferFlushed && bufferable) {\n this.bufferFlushed = false;\n this.afterBufferFlushed(bufferable, ElementaryStreamTypes.AUDIO, PlaylistLevelType.AUDIO);\n }\n const bufferInfo = this.getFwdBufferInfo(bufferable, PlaylistLevelType.AUDIO);\n if (bufferInfo === null) {\n return;\n }\n const {\n bufferedTrack,\n switchingTrack\n } = this;\n if (!switchingTrack && this._streamEnded(bufferInfo, trackDetails)) {\n hls.trigger(Events.BUFFER_EOS, {\n type: 'audio'\n });\n this.state = State.ENDED;\n return;\n }\n const mainBufferInfo = this.getFwdBufferInfo(this.videoBuffer ? this.videoBuffer : this.media, PlaylistLevelType.MAIN);\n const bufferLen = bufferInfo.len;\n const maxBufLen = this.getMaxBufferLength(mainBufferInfo == null ? void 0 : mainBufferInfo.len);\n const fragments = trackDetails.fragments;\n const start = fragments[0].start;\n let targetBufferTime = this.flushing ? this.getLoadPosition() : bufferInfo.end;\n if (switchingTrack && media) {\n const pos = this.getLoadPosition();\n // STABLE\n if (bufferedTrack && !mediaAttributesIdentical(switchingTrack.attrs, bufferedTrack.attrs)) {\n targetBufferTime = pos;\n }\n // if currentTime (pos) is less than alt audio playlist start time, it means that alt audio is ahead of currentTime\n if (trackDetails.PTSKnown && pos < start) {\n // if everything is buffered from pos to start or if audio buffer upfront, let's seek to start\n if (bufferInfo.end > start || bufferInfo.nextStart) {\n this.log('Alt audio track ahead of main track, seek to start of alt audio track');\n media.currentTime = start + 0.05;\n }\n }\n }\n\n // if buffer length is less than maxBufLen, or near the end, find a fragment to load\n if (bufferLen >= maxBufLen && !switchingTrack && targetBufferTime < fragments[fragments.length - 1].start) {\n return;\n }\n let frag = this.getNextFragment(targetBufferTime, trackDetails);\n let atGap = false;\n // Avoid loop loading by using nextLoadPosition set for backtracking and skipping consecutive GAP tags\n if (frag && this.isLoopLoading(frag, targetBufferTime)) {\n atGap = !!frag.gap;\n frag = this.getNextFragmentLoopLoading(frag, trackDetails, bufferInfo, PlaylistLevelType.MAIN, maxBufLen);\n }\n if (!frag) {\n this.bufferFlushed = true;\n return;\n }\n\n // Buffer audio up to one target duration ahead of main buffer\n const atBufferSyncLimit = mainBufferInfo && frag.start > mainBufferInfo.end + trackDetails.targetduration;\n if (atBufferSyncLimit ||\n // Or wait for main buffer after buffing some audio\n !(mainBufferInfo != null && mainBufferInfo.len) && bufferInfo.len) {\n // Check fragment-tracker for main fragments since GAP segments do not show up in bufferInfo\n const mainFrag = this.getAppendedFrag(frag.start, PlaylistLevelType.MAIN);\n if (mainFrag === null) {\n return;\n }\n // Bridge gaps in main buffer\n atGap || (atGap = !!mainFrag.gap || !!atBufferSyncLimit && mainBufferInfo.len === 0);\n if (atBufferSyncLimit && !atGap || atGap && bufferInfo.nextStart && bufferInfo.nextStart < mainFrag.end) {\n return;\n }\n }\n this.loadFragment(frag, levelInfo, targetBufferTime);\n }\n getMaxBufferLength(mainBufferLength) {\n const maxConfigBuffer = super.getMaxBufferLength();\n if (!mainBufferLength) {\n return maxConfigBuffer;\n }\n return Math.min(Math.max(maxConfigBuffer, mainBufferLength), this.config.maxMaxBufferLength);\n }\n onMediaDetaching() {\n this.videoBuffer = null;\n this.bufferFlushed = this.flushing = false;\n super.onMediaDetaching();\n }\n onAudioTracksUpdated(event, {\n audioTracks\n }) {\n // Reset tranxmuxer is essential for large context switches (Content Steering)\n this.resetTransmuxer();\n this.levels = audioTracks.map(mediaPlaylist => new Level(mediaPlaylist));\n }\n onAudioTrackSwitching(event, data) {\n // if any URL found on new audio track, it is an alternate audio track\n const altAudio = !!data.url;\n this.trackId = data.id;\n const {\n fragCurrent\n } = this;\n if (fragCurrent) {\n fragCurrent.abortRequests();\n this.removeUnbufferedFrags(fragCurrent.start);\n }\n this.resetLoadingState();\n // destroy useless transmuxer when switching audio to main\n if (!altAudio) {\n this.resetTransmuxer();\n } else {\n // switching to audio track, start timer if not already started\n this.setInterval(TICK_INTERVAL$2);\n }\n\n // should we switch tracks ?\n if (altAudio) {\n this.switchingTrack = data;\n // main audio track are handled by stream-controller, just do something if switching to alt audio track\n this.state = State.IDLE;\n this.flushAudioIfNeeded(data);\n } else {\n this.switchingTrack = null;\n this.bufferedTrack = data;\n this.state = State.STOPPED;\n }\n this.tick();\n }\n onManifestLoading() {\n this.fragmentTracker.removeAllFragments();\n this.startPosition = this.lastCurrentTime = 0;\n this.bufferFlushed = this.flushing = false;\n this.levels = this.mainDetails = this.waitingData = this.bufferedTrack = this.cachedTrackLoadedData = this.switchingTrack = null;\n this.startFragRequested = false;\n this.trackId = this.videoTrackCC = this.waitingVideoCC = -1;\n }\n onLevelLoaded(event, data) {\n this.mainDetails = data.details;\n if (this.cachedTrackLoadedData !== null) {\n this.hls.trigger(Events.AUDIO_TRACK_LOADED, this.cachedTrackLoadedData);\n this.cachedTrackLoadedData = null;\n }\n }\n onAudioTrackLoaded(event, data) {\n var _track$details;\n if (this.mainDetails == null) {\n this.cachedTrackLoadedData = data;\n return;\n }\n const {\n levels\n } = this;\n const {\n details: newDetails,\n id: trackId\n } = data;\n if (!levels) {\n this.warn(`Audio tracks were reset while loading level ${trackId}`);\n return;\n }\n this.log(`Audio track ${trackId} loaded [${newDetails.startSN},${newDetails.endSN}]${newDetails.lastPartSn ? `[part-${newDetails.lastPartSn}-${newDetails.lastPartIndex}]` : ''},duration:${newDetails.totalduration}`);\n const track = levels[trackId];\n let sliding = 0;\n if (newDetails.live || (_track$details = track.details) != null && _track$details.live) {\n this.checkLiveUpdate(newDetails);\n const mainDetails = this.mainDetails;\n if (newDetails.deltaUpdateFailed || !mainDetails) {\n return;\n }\n if (!track.details && newDetails.hasProgramDateTime && mainDetails.hasProgramDateTime) {\n // Make sure our audio rendition is aligned with the \"main\" rendition, using\n // pdt as our reference times.\n alignMediaPlaylistByPDT(newDetails, mainDetails);\n sliding = newDetails.fragments[0].start;\n } else {\n var _this$levelLastLoaded;\n sliding = this.alignPlaylists(newDetails, track.details, (_this$levelLastLoaded = this.levelLastLoaded) == null ? void 0 : _this$levelLastLoaded.details);\n }\n }\n track.details = newDetails;\n this.levelLastLoaded = track;\n\n // compute start position if we are aligned with the main playlist\n if (!this.startFragRequested && (this.mainDetails || !newDetails.live)) {\n this.setStartPosition(this.mainDetails || newDetails, sliding);\n }\n // only switch back to IDLE state if we were waiting for track to start downloading a new fragment\n if (this.state === State.WAITING_TRACK && !this.waitForCdnTuneIn(newDetails)) {\n this.state = State.IDLE;\n }\n\n // trigger handler right now\n this.tick();\n }\n _handleFragmentLoadProgress(data) {\n var _frag$initSegment;\n const {\n frag,\n part,\n payload\n } = data;\n const {\n config,\n trackId,\n levels\n } = this;\n if (!levels) {\n this.warn(`Audio tracks were reset while fragment load was in progress. Fragment ${frag.sn} of level ${frag.level} will not be buffered`);\n return;\n }\n const track = levels[trackId];\n if (!track) {\n this.warn('Audio track is undefined on fragment load progress');\n return;\n }\n const details = track.details;\n if (!details) {\n this.warn('Audio track details undefined on fragment load progress');\n this.removeUnbufferedFrags(frag.start);\n return;\n }\n const audioCodec = config.defaultAudioCodec || track.audioCodec || 'mp4a.40.2';\n let transmuxer = this.transmuxer;\n if (!transmuxer) {\n transmuxer = this.transmuxer = new TransmuxerInterface(this.hls, PlaylistLevelType.AUDIO, this._handleTransmuxComplete.bind(this), this._handleTransmuxerFlush.bind(this));\n }\n\n // Check if we have video initPTS\n // If not we need to wait for it\n const initPTS = this.initPTS[frag.cc];\n const initSegmentData = (_frag$initSegment = frag.initSegment) == null ? void 0 : _frag$initSegment.data;\n if (initPTS !== undefined) {\n // this.log(`Transmuxing ${sn} of [${details.startSN} ,${details.endSN}],track ${trackId}`);\n // time Offset is accurate if level PTS is known, or if playlist is not sliding (not live)\n const accurateTimeOffset = false; // details.PTSKnown || !details.live;\n const partIndex = part ? part.index : -1;\n const partial = partIndex !== -1;\n const chunkMeta = new ChunkMetadata(frag.level, frag.sn, frag.stats.chunkCount, payload.byteLength, partIndex, partial);\n transmuxer.push(payload, initSegmentData, audioCodec, '', frag, part, details.totalduration, accurateTimeOffset, chunkMeta, initPTS);\n } else {\n this.log(`Unknown video PTS for cc ${frag.cc}, waiting for video PTS before demuxing audio frag ${frag.sn} of [${details.startSN} ,${details.endSN}],track ${trackId}`);\n const {\n cache\n } = this.waitingData = this.waitingData || {\n frag,\n part,\n cache: new ChunkCache(),\n complete: false\n };\n cache.push(new Uint8Array(payload));\n this.waitingVideoCC = this.videoTrackCC;\n this.state = State.WAITING_INIT_PTS;\n }\n }\n _handleFragmentLoadComplete(fragLoadedData) {\n if (this.waitingData) {\n this.waitingData.complete = true;\n return;\n }\n super._handleFragmentLoadComplete(fragLoadedData);\n }\n onBufferReset( /* event: Events.BUFFER_RESET */\n ) {\n // reset reference to sourcebuffers\n this.mediaBuffer = this.videoBuffer = null;\n this.loadedmetadata = false;\n }\n onBufferCreated(event, data) {\n const audioTrack = data.tracks.audio;\n if (audioTrack) {\n this.mediaBuffer = audioTrack.buffer || null;\n }\n if (data.tracks.video) {\n this.videoBuffer = data.tracks.video.buffer || null;\n }\n }\n onFragBuffered(event, data) {\n const {\n frag,\n part\n } = data;\n if (frag.type !== PlaylistLevelType.AUDIO) {\n if (!this.loadedmetadata && frag.type === PlaylistLevelType.MAIN) {\n const bufferable = this.videoBuffer || this.media;\n if (bufferable) {\n const bufferedTimeRanges = BufferHelper.getBuffered(bufferable);\n if (bufferedTimeRanges.length) {\n this.loadedmetadata = true;\n }\n }\n }\n return;\n }\n if (this.fragContextChanged(frag)) {\n // If a level switch was requested while a fragment was buffering, it will emit the FRAG_BUFFERED event upon completion\n // Avoid setting state back to IDLE or concluding the audio switch; otherwise, the switched-to track will not buffer\n this.warn(`Fragment ${frag.sn}${part ? ' p: ' + part.index : ''} of level ${frag.level} finished buffering, but was aborted. state: ${this.state}, audioSwitch: ${this.switchingTrack ? this.switchingTrack.name : 'false'}`);\n return;\n }\n if (frag.sn !== 'initSegment') {\n this.fragPrevious = frag;\n const track = this.switchingTrack;\n if (track) {\n this.bufferedTrack = track;\n this.switchingTrack = null;\n this.hls.trigger(Events.AUDIO_TRACK_SWITCHED, _objectSpread2({}, track));\n }\n }\n this.fragBufferedComplete(frag, part);\n }\n onError(event, data) {\n var _data$context;\n if (data.fatal) {\n this.state = State.ERROR;\n return;\n }\n switch (data.details) {\n case ErrorDetails.FRAG_GAP:\n case ErrorDetails.FRAG_PARSING_ERROR:\n case ErrorDetails.FRAG_DECRYPT_ERROR:\n case ErrorDetails.FRAG_LOAD_ERROR:\n case ErrorDetails.FRAG_LOAD_TIMEOUT:\n case ErrorDetails.KEY_LOAD_ERROR:\n case ErrorDetails.KEY_LOAD_TIMEOUT:\n this.onFragmentOrKeyLoadError(PlaylistLevelType.AUDIO, data);\n break;\n case ErrorDetails.AUDIO_TRACK_LOAD_ERROR:\n case ErrorDetails.AUDIO_TRACK_LOAD_TIMEOUT:\n case ErrorDetails.LEVEL_PARSING_ERROR:\n // in case of non fatal error while loading track, if not retrying to load track, switch back to IDLE\n if (!data.levelRetry && this.state === State.WAITING_TRACK && ((_data$context = data.context) == null ? void 0 : _data$context.type) === PlaylistContextType.AUDIO_TRACK) {\n this.state = State.IDLE;\n }\n break;\n case ErrorDetails.BUFFER_APPEND_ERROR:\n case ErrorDetails.BUFFER_FULL_ERROR:\n if (!data.parent || data.parent !== 'audio') {\n return;\n }\n if (data.details === ErrorDetails.BUFFER_APPEND_ERROR) {\n this.resetLoadingState();\n return;\n }\n if (this.reduceLengthAndFlushBuffer(data)) {\n this.bufferedTrack = null;\n super.flushMainBuffer(0, Number.POSITIVE_INFINITY, 'audio');\n }\n break;\n case ErrorDetails.INTERNAL_EXCEPTION:\n this.recoverWorkerError(data);\n break;\n }\n }\n onBufferFlushing(event, {\n type\n }) {\n if (type !== ElementaryStreamTypes.VIDEO) {\n this.flushing = true;\n }\n }\n onBufferFlushed(event, {\n type\n }) {\n if (type !== ElementaryStreamTypes.VIDEO) {\n this.flushing = false;\n this.bufferFlushed = true;\n if (this.state === State.ENDED) {\n this.state = State.IDLE;\n }\n const mediaBuffer = this.mediaBuffer || this.media;\n if (mediaBuffer) {\n this.afterBufferFlushed(mediaBuffer, type, PlaylistLevelType.AUDIO);\n this.tick();\n }\n }\n }\n _handleTransmuxComplete(transmuxResult) {\n var _id3$samples;\n const id = 'audio';\n const {\n hls\n } = this;\n const {\n remuxResult,\n chunkMeta\n } = transmuxResult;\n const context = this.getCurrentContext(chunkMeta);\n if (!context) {\n this.resetWhenMissingContext(chunkMeta);\n return;\n }\n const {\n frag,\n part,\n level\n } = context;\n const {\n details\n } = level;\n const {\n audio,\n text,\n id3,\n initSegment\n } = remuxResult;\n\n // Check if the current fragment has been aborted. We check this by first seeing if we're still playing the current level.\n // If we are, subsequently check if the currently loading fragment (fragCurrent) has changed.\n if (this.fragContextChanged(frag) || !details) {\n this.fragmentTracker.removeFragment(frag);\n return;\n }\n this.state = State.PARSING;\n if (this.switchingTrack && audio) {\n this.completeAudioSwitch(this.switchingTrack);\n }\n if (initSegment != null && initSegment.tracks) {\n const mapFragment = frag.initSegment || frag;\n this._bufferInitSegment(level, initSegment.tracks, mapFragment, chunkMeta);\n hls.trigger(Events.FRAG_PARSING_INIT_SEGMENT, {\n frag: mapFragment,\n id,\n tracks: initSegment.tracks\n });\n // Only flush audio from old audio tracks when PTS is known on new audio track\n }\n if (audio) {\n const {\n startPTS,\n endPTS,\n startDTS,\n endDTS\n } = audio;\n if (part) {\n part.elementaryStreams[ElementaryStreamTypes.AUDIO] = {\n startPTS,\n endPTS,\n startDTS,\n endDTS\n };\n }\n frag.setElementaryStreamInfo(ElementaryStreamTypes.AUDIO, startPTS, endPTS, startDTS, endDTS);\n this.bufferFragmentData(audio, frag, part, chunkMeta);\n }\n if (id3 != null && (_id3$samples = id3.samples) != null && _id3$samples.length) {\n const emittedID3 = _extends({\n id,\n frag,\n details\n }, id3);\n hls.trigger(Events.FRAG_PARSING_METADATA, emittedID3);\n }\n if (text) {\n const emittedText = _extends({\n id,\n frag,\n details\n }, text);\n hls.trigger(Events.FRAG_PARSING_USERDATA, emittedText);\n }\n }\n _bufferInitSegment(currentLevel, tracks, frag, chunkMeta) {\n if (this.state !== State.PARSING) {\n return;\n }\n // delete any video track found on audio transmuxer\n if (tracks.video) {\n delete tracks.video;\n }\n\n // include levelCodec in audio and video tracks\n const track = tracks.audio;\n if (!track) {\n return;\n }\n track.id = 'audio';\n const variantAudioCodecs = currentLevel.audioCodec;\n this.log(`Init audio buffer, container:${track.container}, codecs[level/parsed]=[${variantAudioCodecs}/${track.codec}]`);\n // SourceBuffer will use track.levelCodec if defined\n if (variantAudioCodecs && variantAudioCodecs.split(',').length === 1) {\n track.levelCodec = variantAudioCodecs;\n }\n this.hls.trigger(Events.BUFFER_CODECS, tracks);\n const initSegment = track.initSegment;\n if (initSegment != null && initSegment.byteLength) {\n const segment = {\n type: 'audio',\n frag,\n part: null,\n chunkMeta,\n parent: frag.type,\n data: initSegment\n };\n this.hls.trigger(Events.BUFFER_APPENDING, segment);\n }\n // trigger handler right now\n this.tickImmediate();\n }\n loadFragment(frag, track, targetBufferTime) {\n // only load if fragment is not loaded or if in audio switch\n const fragState = this.fragmentTracker.getState(frag);\n this.fragCurrent = frag;\n\n // we force a frag loading in audio switch as fragment tracker might not have evicted previous frags in case of quick audio switch\n if (this.switchingTrack || fragState === FragmentState.NOT_LOADED || fragState === FragmentState.PARTIAL) {\n var _track$details2;\n if (frag.sn === 'initSegment') {\n this._loadInitSegment(frag, track);\n } else if ((_track$details2 = track.details) != null && _track$details2.live && !this.initPTS[frag.cc]) {\n this.log(`Waiting for video PTS in continuity counter ${frag.cc} of live stream before loading audio fragment ${frag.sn} of level ${this.trackId}`);\n this.state = State.WAITING_INIT_PTS;\n const mainDetails = this.mainDetails;\n if (mainDetails && mainDetails.fragments[0].start !== track.details.fragments[0].start) {\n alignMediaPlaylistByPDT(track.details, mainDetails);\n }\n } else {\n this.startFragRequested = true;\n super.loadFragment(frag, track, targetBufferTime);\n }\n } else {\n this.clearTrackerIfNeeded(frag);\n }\n }\n flushAudioIfNeeded(switchingTrack) {\n const {\n media,\n bufferedTrack\n } = this;\n const bufferedAttributes = bufferedTrack == null ? void 0 : bufferedTrack.attrs;\n const switchAttributes = switchingTrack.attrs;\n if (media && bufferedAttributes && (bufferedAttributes.CHANNELS !== switchAttributes.CHANNELS || bufferedTrack.name !== switchingTrack.name || bufferedTrack.lang !== switchingTrack.lang)) {\n this.log('Switching audio track : flushing all audio');\n super.flushMainBuffer(0, Number.POSITIVE_INFINITY, 'audio');\n this.bufferedTrack = null;\n }\n }\n completeAudioSwitch(switchingTrack) {\n const {\n hls\n } = this;\n this.flushAudioIfNeeded(switchingTrack);\n this.bufferedTrack = switchingTrack;\n this.switchingTrack = null;\n hls.trigger(Events.AUDIO_TRACK_SWITCHED, _objectSpread2({}, switchingTrack));\n }\n}\n\nclass AudioTrackController extends BasePlaylistController {\n constructor(hls) {\n super(hls, '[audio-track-controller]');\n this.tracks = [];\n this.groupIds = null;\n this.tracksInGroup = [];\n this.trackId = -1;\n this.currentTrack = null;\n this.selectDefaultTrack = true;\n this.registerListeners();\n }\n registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.on(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.on(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.on(Events.AUDIO_TRACK_LOADED, this.onAudioTrackLoaded, this);\n hls.on(Events.ERROR, this.onError, this);\n }\n unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.off(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.off(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.off(Events.AUDIO_TRACK_LOADED, this.onAudioTrackLoaded, this);\n hls.off(Events.ERROR, this.onError, this);\n }\n destroy() {\n this.unregisterListeners();\n this.tracks.length = 0;\n this.tracksInGroup.length = 0;\n this.currentTrack = null;\n super.destroy();\n }\n onManifestLoading() {\n this.tracks = [];\n this.tracksInGroup = [];\n this.groupIds = null;\n this.currentTrack = null;\n this.trackId = -1;\n this.selectDefaultTrack = true;\n }\n onManifestParsed(event, data) {\n this.tracks = data.audioTracks || [];\n }\n onAudioTrackLoaded(event, data) {\n const {\n id,\n groupId,\n details\n } = data;\n const trackInActiveGroup = this.tracksInGroup[id];\n if (!trackInActiveGroup || trackInActiveGroup.groupId !== groupId) {\n this.warn(`Audio track with id:${id} and group:${groupId} not found in active group ${trackInActiveGroup == null ? void 0 : trackInActiveGroup.groupId}`);\n return;\n }\n const curDetails = trackInActiveGroup.details;\n trackInActiveGroup.details = data.details;\n this.log(`Audio track ${id} \"${trackInActiveGroup.name}\" lang:${trackInActiveGroup.lang} group:${groupId} loaded [${details.startSN}-${details.endSN}]`);\n if (id === this.trackId) {\n this.playlistLoaded(id, data, curDetails);\n }\n }\n onLevelLoading(event, data) {\n this.switchLevel(data.level);\n }\n onLevelSwitching(event, data) {\n this.switchLevel(data.level);\n }\n switchLevel(levelIndex) {\n const levelInfo = this.hls.levels[levelIndex];\n if (!levelInfo) {\n return;\n }\n const audioGroups = levelInfo.audioGroups || null;\n const currentGroups = this.groupIds;\n let currentTrack = this.currentTrack;\n if (!audioGroups || (currentGroups == null ? void 0 : currentGroups.length) !== (audioGroups == null ? void 0 : audioGroups.length) || audioGroups != null && audioGroups.some(groupId => (currentGroups == null ? void 0 : currentGroups.indexOf(groupId)) === -1)) {\n this.groupIds = audioGroups;\n this.trackId = -1;\n this.currentTrack = null;\n const audioTracks = this.tracks.filter(track => !audioGroups || audioGroups.indexOf(track.groupId) !== -1);\n if (audioTracks.length) {\n // Disable selectDefaultTrack if there are no default tracks\n if (this.selectDefaultTrack && !audioTracks.some(track => track.default)) {\n this.selectDefaultTrack = false;\n }\n // track.id should match hls.audioTracks index\n audioTracks.forEach((track, i) => {\n track.id = i;\n });\n } else if (!currentTrack && !this.tracksInGroup.length) {\n // Do not dispatch AUDIO_TRACKS_UPDATED when there were and are no tracks\n return;\n }\n this.tracksInGroup = audioTracks;\n\n // Find preferred track\n const audioPreference = this.hls.config.audioPreference;\n if (!currentTrack && audioPreference) {\n const groupIndex = findMatchingOption(audioPreference, audioTracks, audioMatchPredicate);\n if (groupIndex > -1) {\n currentTrack = audioTracks[groupIndex];\n } else {\n const allIndex = findMatchingOption(audioPreference, this.tracks);\n currentTrack = this.tracks[allIndex];\n }\n }\n\n // Select initial track\n let trackId = this.findTrackId(currentTrack);\n if (trackId === -1 && currentTrack) {\n trackId = this.findTrackId(null);\n }\n\n // Dispatch events and load track if needed\n const audioTracksUpdated = {\n audioTracks\n };\n this.log(`Updating audio tracks, ${audioTracks.length} track(s) found in group(s): ${audioGroups == null ? void 0 : audioGroups.join(',')}`);\n this.hls.trigger(Events.AUDIO_TRACKS_UPDATED, audioTracksUpdated);\n const selectedTrackId = this.trackId;\n if (trackId !== -1 && selectedTrackId === -1) {\n this.setAudioTrack(trackId);\n } else if (audioTracks.length && selectedTrackId === -1) {\n var _this$groupIds;\n const error = new Error(`No audio track selected for current audio group-ID(s): ${(_this$groupIds = this.groupIds) == null ? void 0 : _this$groupIds.join(',')} track count: ${audioTracks.length}`);\n this.warn(error.message);\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.AUDIO_TRACK_LOAD_ERROR,\n fatal: true,\n error\n });\n }\n } else if (this.shouldReloadPlaylist(currentTrack)) {\n // Retry playlist loading if no playlist is or has been loaded yet\n this.setAudioTrack(this.trackId);\n }\n }\n onError(event, data) {\n if (data.fatal || !data.context) {\n return;\n }\n if (data.context.type === PlaylistContextType.AUDIO_TRACK && data.context.id === this.trackId && (!this.groupIds || this.groupIds.indexOf(data.context.groupId) !== -1)) {\n this.requestScheduled = -1;\n this.checkRetry(data);\n }\n }\n get allAudioTracks() {\n return this.tracks;\n }\n get audioTracks() {\n return this.tracksInGroup;\n }\n get audioTrack() {\n return this.trackId;\n }\n set audioTrack(newId) {\n // If audio track is selected from API then don't choose from the manifest default track\n this.selectDefaultTrack = false;\n this.setAudioTrack(newId);\n }\n setAudioOption(audioOption) {\n const hls = this.hls;\n hls.config.audioPreference = audioOption;\n if (audioOption) {\n const allAudioTracks = this.allAudioTracks;\n this.selectDefaultTrack = false;\n if (allAudioTracks.length) {\n // First see if current option matches (no switch op)\n const currentTrack = this.currentTrack;\n if (currentTrack && matchesOption(audioOption, currentTrack, audioMatchPredicate)) {\n return currentTrack;\n }\n // Find option in available tracks (tracksInGroup)\n const groupIndex = findMatchingOption(audioOption, this.tracksInGroup, audioMatchPredicate);\n if (groupIndex > -1) {\n const track = this.tracksInGroup[groupIndex];\n this.setAudioTrack(groupIndex);\n return track;\n } else if (currentTrack) {\n // Find option in nearest level audio group\n let searchIndex = hls.loadLevel;\n if (searchIndex === -1) {\n searchIndex = hls.firstAutoLevel;\n }\n const switchIndex = findClosestLevelWithAudioGroup(audioOption, hls.levels, allAudioTracks, searchIndex, audioMatchPredicate);\n if (switchIndex === -1) {\n // could not find matching variant\n return null;\n }\n // and switch level to acheive the audio group switch\n hls.nextLoadLevel = switchIndex;\n }\n if (audioOption.channels || audioOption.audioCodec) {\n // Could not find a match with codec / channels predicate\n // Find a match without channels or codec\n const withoutCodecAndChannelsMatch = findMatchingOption(audioOption, allAudioTracks);\n if (withoutCodecAndChannelsMatch > -1) {\n return allAudioTracks[withoutCodecAndChannelsMatch];\n }\n }\n }\n }\n return null;\n }\n setAudioTrack(newId) {\n const tracks = this.tracksInGroup;\n\n // check if level idx is valid\n if (newId < 0 || newId >= tracks.length) {\n this.warn(`Invalid audio track id: ${newId}`);\n return;\n }\n\n // stopping live reloading timer if any\n this.clearTimer();\n this.selectDefaultTrack = false;\n const lastTrack = this.currentTrack;\n const track = tracks[newId];\n const trackLoaded = track.details && !track.details.live;\n if (newId === this.trackId && track === lastTrack && trackLoaded) {\n return;\n }\n this.log(`Switching to audio-track ${newId} \"${track.name}\" lang:${track.lang} group:${track.groupId} channels:${track.channels}`);\n this.trackId = newId;\n this.currentTrack = track;\n this.hls.trigger(Events.AUDIO_TRACK_SWITCHING, _objectSpread2({}, track));\n // Do not reload track unless live\n if (trackLoaded) {\n return;\n }\n const hlsUrlParameters = this.switchParams(track.url, lastTrack == null ? void 0 : lastTrack.details, track.details);\n this.loadPlaylist(hlsUrlParameters);\n }\n findTrackId(currentTrack) {\n const audioTracks = this.tracksInGroup;\n for (let i = 0; i < audioTracks.length; i++) {\n const track = audioTracks[i];\n if (this.selectDefaultTrack && !track.default) {\n continue;\n }\n if (!currentTrack || matchesOption(currentTrack, track, audioMatchPredicate)) {\n return i;\n }\n }\n if (currentTrack) {\n const {\n name,\n lang,\n assocLang,\n characteristics,\n audioCodec,\n channels\n } = currentTrack;\n for (let i = 0; i < audioTracks.length; i++) {\n const track = audioTracks[i];\n if (matchesOption({\n name,\n lang,\n assocLang,\n characteristics,\n audioCodec,\n channels\n }, track, audioMatchPredicate)) {\n return i;\n }\n }\n for (let i = 0; i < audioTracks.length; i++) {\n const track = audioTracks[i];\n if (mediaAttributesIdentical(currentTrack.attrs, track.attrs, ['LANGUAGE', 'ASSOC-LANGUAGE', 'CHARACTERISTICS'])) {\n return i;\n }\n }\n for (let i = 0; i < audioTracks.length; i++) {\n const track = audioTracks[i];\n if (mediaAttributesIdentical(currentTrack.attrs, track.attrs, ['LANGUAGE'])) {\n return i;\n }\n }\n }\n return -1;\n }\n loadPlaylist(hlsUrlParameters) {\n const audioTrack = this.currentTrack;\n if (this.shouldLoadPlaylist(audioTrack) && audioTrack) {\n super.loadPlaylist();\n const id = audioTrack.id;\n const groupId = audioTrack.groupId;\n let url = audioTrack.url;\n if (hlsUrlParameters) {\n try {\n url = hlsUrlParameters.addDirectives(url);\n } catch (error) {\n this.warn(`Could not construct new URL with HLS Delivery Directives: ${error}`);\n }\n }\n // track not retrieved yet, or live playlist we need to (re)load it\n this.log(`loading audio-track playlist ${id} \"${audioTrack.name}\" lang:${audioTrack.lang} group:${groupId}`);\n this.clearTimer();\n this.hls.trigger(Events.AUDIO_TRACK_LOADING, {\n url,\n id,\n groupId,\n deliveryDirectives: hlsUrlParameters || null\n });\n }\n }\n}\n\nconst TICK_INTERVAL$1 = 500; // how often to tick in ms\n\nclass SubtitleStreamController extends BaseStreamController {\n constructor(hls, fragmentTracker, keyLoader) {\n super(hls, fragmentTracker, keyLoader, '[subtitle-stream-controller]', PlaylistLevelType.SUBTITLE);\n this.currentTrackId = -1;\n this.tracksBuffered = [];\n this.mainDetails = null;\n this._registerListeners();\n }\n onHandlerDestroying() {\n this._unregisterListeners();\n super.onHandlerDestroying();\n this.mainDetails = null;\n }\n _registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.on(Events.ERROR, this.onError, this);\n hls.on(Events.SUBTITLE_TRACKS_UPDATED, this.onSubtitleTracksUpdated, this);\n hls.on(Events.SUBTITLE_TRACK_SWITCH, this.onSubtitleTrackSwitch, this);\n hls.on(Events.SUBTITLE_TRACK_LOADED, this.onSubtitleTrackLoaded, this);\n hls.on(Events.SUBTITLE_FRAG_PROCESSED, this.onSubtitleFragProcessed, this);\n hls.on(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.on(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n }\n _unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.LEVEL_LOADED, this.onLevelLoaded, this);\n hls.off(Events.ERROR, this.onError, this);\n hls.off(Events.SUBTITLE_TRACKS_UPDATED, this.onSubtitleTracksUpdated, this);\n hls.off(Events.SUBTITLE_TRACK_SWITCH, this.onSubtitleTrackSwitch, this);\n hls.off(Events.SUBTITLE_TRACK_LOADED, this.onSubtitleTrackLoaded, this);\n hls.off(Events.SUBTITLE_FRAG_PROCESSED, this.onSubtitleFragProcessed, this);\n hls.off(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.off(Events.FRAG_BUFFERED, this.onFragBuffered, this);\n }\n startLoad(startPosition) {\n this.stopLoad();\n this.state = State.IDLE;\n this.setInterval(TICK_INTERVAL$1);\n this.nextLoadPosition = this.startPosition = this.lastCurrentTime = startPosition;\n this.tick();\n }\n onManifestLoading() {\n this.mainDetails = null;\n this.fragmentTracker.removeAllFragments();\n }\n onMediaDetaching() {\n this.tracksBuffered = [];\n super.onMediaDetaching();\n }\n onLevelLoaded(event, data) {\n this.mainDetails = data.details;\n }\n onSubtitleFragProcessed(event, data) {\n const {\n frag,\n success\n } = data;\n this.fragPrevious = frag;\n this.state = State.IDLE;\n if (!success) {\n return;\n }\n const buffered = this.tracksBuffered[this.currentTrackId];\n if (!buffered) {\n return;\n }\n\n // Create/update a buffered array matching the interface used by BufferHelper.bufferedInfo\n // so we can re-use the logic used to detect how much has been buffered\n let timeRange;\n const fragStart = frag.start;\n for (let i = 0; i < buffered.length; i++) {\n if (fragStart >= buffered[i].start && fragStart <= buffered[i].end) {\n timeRange = buffered[i];\n break;\n }\n }\n const fragEnd = frag.start + frag.duration;\n if (timeRange) {\n timeRange.end = fragEnd;\n } else {\n timeRange = {\n start: fragStart,\n end: fragEnd\n };\n buffered.push(timeRange);\n }\n this.fragmentTracker.fragBuffered(frag);\n this.fragBufferedComplete(frag, null);\n }\n onBufferFlushing(event, data) {\n const {\n startOffset,\n endOffset\n } = data;\n if (startOffset === 0 && endOffset !== Number.POSITIVE_INFINITY) {\n const endOffsetSubtitles = endOffset - 1;\n if (endOffsetSubtitles <= 0) {\n return;\n }\n data.endOffsetSubtitles = Math.max(0, endOffsetSubtitles);\n this.tracksBuffered.forEach(buffered => {\n for (let i = 0; i < buffered.length;) {\n if (buffered[i].end <= endOffsetSubtitles) {\n buffered.shift();\n continue;\n } else if (buffered[i].start < endOffsetSubtitles) {\n buffered[i].start = endOffsetSubtitles;\n } else {\n break;\n }\n i++;\n }\n });\n this.fragmentTracker.removeFragmentsInRange(startOffset, endOffsetSubtitles, PlaylistLevelType.SUBTITLE);\n }\n }\n onFragBuffered(event, data) {\n if (!this.loadedmetadata && data.frag.type === PlaylistLevelType.MAIN) {\n var _this$media;\n if ((_this$media = this.media) != null && _this$media.buffered.length) {\n this.loadedmetadata = true;\n }\n }\n }\n\n // If something goes wrong, proceed to next frag, if we were processing one.\n onError(event, data) {\n const frag = data.frag;\n if ((frag == null ? void 0 : frag.type) === PlaylistLevelType.SUBTITLE) {\n if (data.details === ErrorDetails.FRAG_GAP) {\n this.fragmentTracker.fragBuffered(frag, true);\n }\n if (this.fragCurrent) {\n this.fragCurrent.abortRequests();\n }\n if (this.state !== State.STOPPED) {\n this.state = State.IDLE;\n }\n }\n }\n\n // Got all new subtitle levels.\n onSubtitleTracksUpdated(event, {\n subtitleTracks\n }) {\n if (this.levels && subtitleOptionsIdentical(this.levels, subtitleTracks)) {\n this.levels = subtitleTracks.map(mediaPlaylist => new Level(mediaPlaylist));\n return;\n }\n this.tracksBuffered = [];\n this.levels = subtitleTracks.map(mediaPlaylist => {\n const level = new Level(mediaPlaylist);\n this.tracksBuffered[level.id] = [];\n return level;\n });\n this.fragmentTracker.removeFragmentsInRange(0, Number.POSITIVE_INFINITY, PlaylistLevelType.SUBTITLE);\n this.fragPrevious = null;\n this.mediaBuffer = null;\n }\n onSubtitleTrackSwitch(event, data) {\n var _this$levels;\n this.currentTrackId = data.id;\n if (!((_this$levels = this.levels) != null && _this$levels.length) || this.currentTrackId === -1) {\n this.clearInterval();\n return;\n }\n\n // Check if track has the necessary details to load fragments\n const currentTrack = this.levels[this.currentTrackId];\n if (currentTrack != null && currentTrack.details) {\n this.mediaBuffer = this.mediaBufferTimeRanges;\n } else {\n this.mediaBuffer = null;\n }\n if (currentTrack) {\n this.setInterval(TICK_INTERVAL$1);\n }\n }\n\n // Got a new set of subtitle fragments.\n onSubtitleTrackLoaded(event, data) {\n var _track$details;\n const {\n currentTrackId,\n levels\n } = this;\n const {\n details: newDetails,\n id: trackId\n } = data;\n if (!levels) {\n this.warn(`Subtitle tracks were reset while loading level ${trackId}`);\n return;\n }\n const track = levels[trackId];\n if (trackId >= levels.length || !track) {\n return;\n }\n this.log(`Subtitle track ${trackId} loaded [${newDetails.startSN},${newDetails.endSN}]${newDetails.lastPartSn ? `[part-${newDetails.lastPartSn}-${newDetails.lastPartIndex}]` : ''},duration:${newDetails.totalduration}`);\n this.mediaBuffer = this.mediaBufferTimeRanges;\n let sliding = 0;\n if (newDetails.live || (_track$details = track.details) != null && _track$details.live) {\n const mainDetails = this.mainDetails;\n if (newDetails.deltaUpdateFailed || !mainDetails) {\n return;\n }\n const mainSlidingStartFragment = mainDetails.fragments[0];\n if (!track.details) {\n if (newDetails.hasProgramDateTime && mainDetails.hasProgramDateTime) {\n alignMediaPlaylistByPDT(newDetails, mainDetails);\n sliding = newDetails.fragments[0].start;\n } else if (mainSlidingStartFragment) {\n // line up live playlist with main so that fragments in range are loaded\n sliding = mainSlidingStartFragment.start;\n addSliding(newDetails, sliding);\n }\n } else {\n var _this$levelLastLoaded;\n sliding = this.alignPlaylists(newDetails, track.details, (_this$levelLastLoaded = this.levelLastLoaded) == null ? void 0 : _this$levelLastLoaded.details);\n if (sliding === 0 && mainSlidingStartFragment) {\n // realign with main when there is no overlap with last refresh\n sliding = mainSlidingStartFragment.start;\n addSliding(newDetails, sliding);\n }\n }\n }\n track.details = newDetails;\n this.levelLastLoaded = track;\n if (trackId !== currentTrackId) {\n return;\n }\n if (!this.startFragRequested && (this.mainDetails || !newDetails.live)) {\n this.setStartPosition(this.mainDetails || newDetails, sliding);\n }\n\n // trigger handler right now\n this.tick();\n\n // If playlist is misaligned because of bad PDT or drift, delete details to resync with main on reload\n if (newDetails.live && !this.fragCurrent && this.media && this.state === State.IDLE) {\n const foundFrag = findFragmentByPTS(null, newDetails.fragments, this.media.currentTime, 0);\n if (!foundFrag) {\n this.warn('Subtitle playlist not aligned with playback');\n track.details = undefined;\n }\n }\n }\n _handleFragmentLoadComplete(fragLoadedData) {\n const {\n frag,\n payload\n } = fragLoadedData;\n const decryptData = frag.decryptdata;\n const hls = this.hls;\n if (this.fragContextChanged(frag)) {\n return;\n }\n // check to see if the payload needs to be decrypted\n if (payload && payload.byteLength > 0 && decryptData != null && decryptData.key && decryptData.iv && decryptData.method === 'AES-128') {\n const startTime = performance.now();\n // decrypt the subtitles\n this.decrypter.decrypt(new Uint8Array(payload), decryptData.key.buffer, decryptData.iv.buffer).catch(err => {\n hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_DECRYPT_ERROR,\n fatal: false,\n error: err,\n reason: err.message,\n frag\n });\n throw err;\n }).then(decryptedData => {\n const endTime = performance.now();\n hls.trigger(Events.FRAG_DECRYPTED, {\n frag,\n payload: decryptedData,\n stats: {\n tstart: startTime,\n tdecrypt: endTime\n }\n });\n }).catch(err => {\n this.warn(`${err.name}: ${err.message}`);\n this.state = State.IDLE;\n });\n }\n }\n doTick() {\n if (!this.media) {\n this.state = State.IDLE;\n return;\n }\n if (this.state === State.IDLE) {\n const {\n currentTrackId,\n levels\n } = this;\n const track = levels == null ? void 0 : levels[currentTrackId];\n if (!track || !levels.length || !track.details) {\n return;\n }\n const {\n config\n } = this;\n const currentTime = this.getLoadPosition();\n const bufferedInfo = BufferHelper.bufferedInfo(this.tracksBuffered[this.currentTrackId] || [], currentTime, config.maxBufferHole);\n const {\n end: targetBufferTime,\n len: bufferLen\n } = bufferedInfo;\n const mainBufferInfo = this.getFwdBufferInfo(this.media, PlaylistLevelType.MAIN);\n const trackDetails = track.details;\n const maxBufLen = this.getMaxBufferLength(mainBufferInfo == null ? void 0 : mainBufferInfo.len) + trackDetails.levelTargetDuration;\n if (bufferLen > maxBufLen) {\n return;\n }\n const fragments = trackDetails.fragments;\n const fragLen = fragments.length;\n const end = trackDetails.edge;\n let foundFrag = null;\n const fragPrevious = this.fragPrevious;\n if (targetBufferTime < end) {\n const tolerance = config.maxFragLookUpTolerance;\n const lookupTolerance = targetBufferTime > end - tolerance ? 0 : tolerance;\n foundFrag = findFragmentByPTS(fragPrevious, fragments, Math.max(fragments[0].start, targetBufferTime), lookupTolerance);\n if (!foundFrag && fragPrevious && fragPrevious.start < fragments[0].start) {\n foundFrag = fragments[0];\n }\n } else {\n foundFrag = fragments[fragLen - 1];\n }\n if (!foundFrag) {\n return;\n }\n foundFrag = this.mapToInitFragWhenRequired(foundFrag);\n if (foundFrag.sn !== 'initSegment') {\n // Load earlier fragment in same discontinuity to make up for misaligned playlists and cues that extend beyond end of segment\n const curSNIdx = foundFrag.sn - trackDetails.startSN;\n const prevFrag = fragments[curSNIdx - 1];\n if (prevFrag && prevFrag.cc === foundFrag.cc && this.fragmentTracker.getState(prevFrag) === FragmentState.NOT_LOADED) {\n foundFrag = prevFrag;\n }\n }\n if (this.fragmentTracker.getState(foundFrag) === FragmentState.NOT_LOADED) {\n // only load if fragment is not loaded\n this.loadFragment(foundFrag, track, targetBufferTime);\n }\n }\n }\n getMaxBufferLength(mainBufferLength) {\n const maxConfigBuffer = super.getMaxBufferLength();\n if (!mainBufferLength) {\n return maxConfigBuffer;\n }\n return Math.max(maxConfigBuffer, mainBufferLength);\n }\n loadFragment(frag, level, targetBufferTime) {\n this.fragCurrent = frag;\n if (frag.sn === 'initSegment') {\n this._loadInitSegment(frag, level);\n } else {\n this.startFragRequested = true;\n super.loadFragment(frag, level, targetBufferTime);\n }\n }\n get mediaBufferTimeRanges() {\n return new BufferableInstance(this.tracksBuffered[this.currentTrackId] || []);\n }\n}\nclass BufferableInstance {\n constructor(timeranges) {\n this.buffered = void 0;\n const getRange = (name, index, length) => {\n index = index >>> 0;\n if (index > length - 1) {\n throw new DOMException(`Failed to execute '${name}' on 'TimeRanges': The index provided (${index}) is greater than the maximum bound (${length})`);\n }\n return timeranges[index][name];\n };\n this.buffered = {\n get length() {\n return timeranges.length;\n },\n end(index) {\n return getRange('end', index, timeranges.length);\n },\n start(index) {\n return getRange('start', index, timeranges.length);\n }\n };\n }\n}\n\nclass SubtitleTrackController extends BasePlaylistController {\n constructor(hls) {\n super(hls, '[subtitle-track-controller]');\n this.media = null;\n this.tracks = [];\n this.groupIds = null;\n this.tracksInGroup = [];\n this.trackId = -1;\n this.currentTrack = null;\n this.selectDefaultTrack = true;\n this.queuedDefaultTrack = -1;\n this.asyncPollTrackChange = () => this.pollTrackChange(0);\n this.useTextTrackPolling = false;\n this.subtitlePollingInterval = -1;\n this._subtitleDisplay = true;\n this.onTextTracksChanged = () => {\n if (!this.useTextTrackPolling) {\n self.clearInterval(this.subtitlePollingInterval);\n }\n // Media is undefined when switching streams via loadSource()\n if (!this.media || !this.hls.config.renderTextTracksNatively) {\n return;\n }\n let textTrack = null;\n const tracks = filterSubtitleTracks(this.media.textTracks);\n for (let i = 0; i < tracks.length; i++) {\n if (tracks[i].mode === 'hidden') {\n // Do not break in case there is a following track with showing.\n textTrack = tracks[i];\n } else if (tracks[i].mode === 'showing') {\n textTrack = tracks[i];\n break;\n }\n }\n\n // Find internal track index for TextTrack\n const trackId = this.findTrackForTextTrack(textTrack);\n if (this.subtitleTrack !== trackId) {\n this.setSubtitleTrack(trackId);\n }\n };\n this.registerListeners();\n }\n destroy() {\n this.unregisterListeners();\n this.tracks.length = 0;\n this.tracksInGroup.length = 0;\n this.currentTrack = null;\n this.onTextTracksChanged = this.asyncPollTrackChange = null;\n super.destroy();\n }\n get subtitleDisplay() {\n return this._subtitleDisplay;\n }\n set subtitleDisplay(value) {\n this._subtitleDisplay = value;\n if (this.trackId > -1) {\n this.toggleTrackModes();\n }\n }\n registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.on(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.on(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.on(Events.SUBTITLE_TRACK_LOADED, this.onSubtitleTrackLoaded, this);\n hls.on(Events.ERROR, this.onError, this);\n }\n unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MEDIA_ATTACHED, this.onMediaAttached, this);\n hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.off(Events.LEVEL_LOADING, this.onLevelLoading, this);\n hls.off(Events.LEVEL_SWITCHING, this.onLevelSwitching, this);\n hls.off(Events.SUBTITLE_TRACK_LOADED, this.onSubtitleTrackLoaded, this);\n hls.off(Events.ERROR, this.onError, this);\n }\n\n // Listen for subtitle track change, then extract the current track ID.\n onMediaAttached(event, data) {\n this.media = data.media;\n if (!this.media) {\n return;\n }\n if (this.queuedDefaultTrack > -1) {\n this.subtitleTrack = this.queuedDefaultTrack;\n this.queuedDefaultTrack = -1;\n }\n this.useTextTrackPolling = !(this.media.textTracks && 'onchange' in this.media.textTracks);\n if (this.useTextTrackPolling) {\n this.pollTrackChange(500);\n } else {\n this.media.textTracks.addEventListener('change', this.asyncPollTrackChange);\n }\n }\n pollTrackChange(timeout) {\n self.clearInterval(this.subtitlePollingInterval);\n this.subtitlePollingInterval = self.setInterval(this.onTextTracksChanged, timeout);\n }\n onMediaDetaching() {\n if (!this.media) {\n return;\n }\n self.clearInterval(this.subtitlePollingInterval);\n if (!this.useTextTrackPolling) {\n this.media.textTracks.removeEventListener('change', this.asyncPollTrackChange);\n }\n if (this.trackId > -1) {\n this.queuedDefaultTrack = this.trackId;\n }\n const textTracks = filterSubtitleTracks(this.media.textTracks);\n // Clear loaded cues on media detachment from tracks\n textTracks.forEach(track => {\n clearCurrentCues(track);\n });\n // Disable all subtitle tracks before detachment so when reattached only tracks in that content are enabled.\n this.subtitleTrack = -1;\n this.media = null;\n }\n onManifestLoading() {\n this.tracks = [];\n this.groupIds = null;\n this.tracksInGroup = [];\n this.trackId = -1;\n this.currentTrack = null;\n this.selectDefaultTrack = true;\n }\n\n // Fired whenever a new manifest is loaded.\n onManifestParsed(event, data) {\n this.tracks = data.subtitleTracks;\n }\n onSubtitleTrackLoaded(event, data) {\n const {\n id,\n groupId,\n details\n } = data;\n const trackInActiveGroup = this.tracksInGroup[id];\n if (!trackInActiveGroup || trackInActiveGroup.groupId !== groupId) {\n this.warn(`Subtitle track with id:${id} and group:${groupId} not found in active group ${trackInActiveGroup == null ? void 0 : trackInActiveGroup.groupId}`);\n return;\n }\n const curDetails = trackInActiveGroup.details;\n trackInActiveGroup.details = data.details;\n this.log(`Subtitle track ${id} \"${trackInActiveGroup.name}\" lang:${trackInActiveGroup.lang} group:${groupId} loaded [${details.startSN}-${details.endSN}]`);\n if (id === this.trackId) {\n this.playlistLoaded(id, data, curDetails);\n }\n }\n onLevelLoading(event, data) {\n this.switchLevel(data.level);\n }\n onLevelSwitching(event, data) {\n this.switchLevel(data.level);\n }\n switchLevel(levelIndex) {\n const levelInfo = this.hls.levels[levelIndex];\n if (!levelInfo) {\n return;\n }\n const subtitleGroups = levelInfo.subtitleGroups || null;\n const currentGroups = this.groupIds;\n let currentTrack = this.currentTrack;\n if (!subtitleGroups || (currentGroups == null ? void 0 : currentGroups.length) !== (subtitleGroups == null ? void 0 : subtitleGroups.length) || subtitleGroups != null && subtitleGroups.some(groupId => (currentGroups == null ? void 0 : currentGroups.indexOf(groupId)) === -1)) {\n this.groupIds = subtitleGroups;\n this.trackId = -1;\n this.currentTrack = null;\n const subtitleTracks = this.tracks.filter(track => !subtitleGroups || subtitleGroups.indexOf(track.groupId) !== -1);\n if (subtitleTracks.length) {\n // Disable selectDefaultTrack if there are no default tracks\n if (this.selectDefaultTrack && !subtitleTracks.some(track => track.default)) {\n this.selectDefaultTrack = false;\n }\n // track.id should match hls.audioTracks index\n subtitleTracks.forEach((track, i) => {\n track.id = i;\n });\n } else if (!currentTrack && !this.tracksInGroup.length) {\n // Do not dispatch SUBTITLE_TRACKS_UPDATED when there were and are no tracks\n return;\n }\n this.tracksInGroup = subtitleTracks;\n\n // Find preferred track\n const subtitlePreference = this.hls.config.subtitlePreference;\n if (!currentTrack && subtitlePreference) {\n this.selectDefaultTrack = false;\n const groupIndex = findMatchingOption(subtitlePreference, subtitleTracks);\n if (groupIndex > -1) {\n currentTrack = subtitleTracks[groupIndex];\n } else {\n const allIndex = findMatchingOption(subtitlePreference, this.tracks);\n currentTrack = this.tracks[allIndex];\n }\n }\n\n // Select initial track\n let trackId = this.findTrackId(currentTrack);\n if (trackId === -1 && currentTrack) {\n trackId = this.findTrackId(null);\n }\n\n // Dispatch events and load track if needed\n const subtitleTracksUpdated = {\n subtitleTracks\n };\n this.log(`Updating subtitle tracks, ${subtitleTracks.length} track(s) found in \"${subtitleGroups == null ? void 0 : subtitleGroups.join(',')}\" group-id`);\n this.hls.trigger(Events.SUBTITLE_TRACKS_UPDATED, subtitleTracksUpdated);\n if (trackId !== -1 && this.trackId === -1) {\n this.setSubtitleTrack(trackId);\n }\n } else if (this.shouldReloadPlaylist(currentTrack)) {\n // Retry playlist loading if no playlist is or has been loaded yet\n this.setSubtitleTrack(this.trackId);\n }\n }\n findTrackId(currentTrack) {\n const tracks = this.tracksInGroup;\n const selectDefault = this.selectDefaultTrack;\n for (let i = 0; i < tracks.length; i++) {\n const track = tracks[i];\n if (selectDefault && !track.default || !selectDefault && !currentTrack) {\n continue;\n }\n if (!currentTrack || matchesOption(track, currentTrack)) {\n return i;\n }\n }\n if (currentTrack) {\n for (let i = 0; i < tracks.length; i++) {\n const track = tracks[i];\n if (mediaAttributesIdentical(currentTrack.attrs, track.attrs, ['LANGUAGE', 'ASSOC-LANGUAGE', 'CHARACTERISTICS'])) {\n return i;\n }\n }\n for (let i = 0; i < tracks.length; i++) {\n const track = tracks[i];\n if (mediaAttributesIdentical(currentTrack.attrs, track.attrs, ['LANGUAGE'])) {\n return i;\n }\n }\n }\n return -1;\n }\n findTrackForTextTrack(textTrack) {\n if (textTrack) {\n const tracks = this.tracksInGroup;\n for (let i = 0; i < tracks.length; i++) {\n const track = tracks[i];\n if (subtitleTrackMatchesTextTrack(track, textTrack)) {\n return i;\n }\n }\n }\n return -1;\n }\n onError(event, data) {\n if (data.fatal || !data.context) {\n return;\n }\n if (data.context.type === PlaylistContextType.SUBTITLE_TRACK && data.context.id === this.trackId && (!this.groupIds || this.groupIds.indexOf(data.context.groupId) !== -1)) {\n this.checkRetry(data);\n }\n }\n get allSubtitleTracks() {\n return this.tracks;\n }\n\n /** get alternate subtitle tracks list from playlist **/\n get subtitleTracks() {\n return this.tracksInGroup;\n }\n\n /** get/set index of the selected subtitle track (based on index in subtitle track lists) **/\n get subtitleTrack() {\n return this.trackId;\n }\n set subtitleTrack(newId) {\n this.selectDefaultTrack = false;\n this.setSubtitleTrack(newId);\n }\n setSubtitleOption(subtitleOption) {\n this.hls.config.subtitlePreference = subtitleOption;\n if (subtitleOption) {\n const allSubtitleTracks = this.allSubtitleTracks;\n this.selectDefaultTrack = false;\n if (allSubtitleTracks.length) {\n // First see if current option matches (no switch op)\n const currentTrack = this.currentTrack;\n if (currentTrack && matchesOption(subtitleOption, currentTrack)) {\n return currentTrack;\n }\n // Find option in current group\n const groupIndex = findMatchingOption(subtitleOption, this.tracksInGroup);\n if (groupIndex > -1) {\n const track = this.tracksInGroup[groupIndex];\n this.setSubtitleTrack(groupIndex);\n return track;\n } else if (currentTrack) {\n // If this is not the initial selection return null\n // option should have matched one in active group\n return null;\n } else {\n // Find the option in all tracks for initial selection\n const allIndex = findMatchingOption(subtitleOption, allSubtitleTracks);\n if (allIndex > -1) {\n return allSubtitleTracks[allIndex];\n }\n }\n }\n }\n return null;\n }\n loadPlaylist(hlsUrlParameters) {\n super.loadPlaylist();\n const currentTrack = this.currentTrack;\n if (this.shouldLoadPlaylist(currentTrack) && currentTrack) {\n const id = currentTrack.id;\n const groupId = currentTrack.groupId;\n let url = currentTrack.url;\n if (hlsUrlParameters) {\n try {\n url = hlsUrlParameters.addDirectives(url);\n } catch (error) {\n this.warn(`Could not construct new URL with HLS Delivery Directives: ${error}`);\n }\n }\n this.log(`Loading subtitle playlist for id ${id}`);\n this.hls.trigger(Events.SUBTITLE_TRACK_LOADING, {\n url,\n id,\n groupId,\n deliveryDirectives: hlsUrlParameters || null\n });\n }\n }\n\n /**\n * Disables the old subtitleTrack and sets current mode on the next subtitleTrack.\n * This operates on the DOM textTracks.\n * A value of -1 will disable all subtitle tracks.\n */\n toggleTrackModes() {\n const {\n media\n } = this;\n if (!media) {\n return;\n }\n const textTracks = filterSubtitleTracks(media.textTracks);\n const currentTrack = this.currentTrack;\n let nextTrack;\n if (currentTrack) {\n nextTrack = textTracks.filter(textTrack => subtitleTrackMatchesTextTrack(currentTrack, textTrack))[0];\n if (!nextTrack) {\n this.warn(`Unable to find subtitle TextTrack with name \"${currentTrack.name}\" and language \"${currentTrack.lang}\"`);\n }\n }\n [].slice.call(textTracks).forEach(track => {\n if (track.mode !== 'disabled' && track !== nextTrack) {\n track.mode = 'disabled';\n }\n });\n if (nextTrack) {\n const mode = this.subtitleDisplay ? 'showing' : 'hidden';\n if (nextTrack.mode !== mode) {\n nextTrack.mode = mode;\n }\n }\n }\n\n /**\n * This method is responsible for validating the subtitle index and periodically reloading if live.\n * Dispatches the SUBTITLE_TRACK_SWITCH event, which instructs the subtitle-stream-controller to load the selected track.\n */\n setSubtitleTrack(newId) {\n const tracks = this.tracksInGroup;\n\n // setting this.subtitleTrack will trigger internal logic\n // if media has not been attached yet, it will fail\n // we keep a reference to the default track id\n // and we'll set subtitleTrack when onMediaAttached is triggered\n if (!this.media) {\n this.queuedDefaultTrack = newId;\n return;\n }\n\n // exit if track id as already set or invalid\n if (newId < -1 || newId >= tracks.length || !isFiniteNumber(newId)) {\n this.warn(`Invalid subtitle track id: ${newId}`);\n return;\n }\n\n // stopping live reloading timer if any\n this.clearTimer();\n this.selectDefaultTrack = false;\n const lastTrack = this.currentTrack;\n const track = tracks[newId] || null;\n this.trackId = newId;\n this.currentTrack = track;\n this.toggleTrackModes();\n if (!track) {\n // switch to -1\n this.hls.trigger(Events.SUBTITLE_TRACK_SWITCH, {\n id: newId\n });\n return;\n }\n const trackLoaded = !!track.details && !track.details.live;\n if (newId === this.trackId && track === lastTrack && trackLoaded) {\n return;\n }\n this.log(`Switching to subtitle-track ${newId}` + (track ? ` \"${track.name}\" lang:${track.lang} group:${track.groupId}` : ''));\n const {\n id,\n groupId = '',\n name,\n type,\n url\n } = track;\n this.hls.trigger(Events.SUBTITLE_TRACK_SWITCH, {\n id,\n groupId,\n name,\n type,\n url\n });\n const hlsUrlParameters = this.switchParams(track.url, lastTrack == null ? void 0 : lastTrack.details, track.details);\n this.loadPlaylist(hlsUrlParameters);\n }\n}\n\nclass BufferOperationQueue {\n constructor(sourceBufferReference) {\n this.buffers = void 0;\n this.queues = {\n video: [],\n audio: [],\n audiovideo: []\n };\n this.buffers = sourceBufferReference;\n }\n append(operation, type, pending) {\n const queue = this.queues[type];\n queue.push(operation);\n if (queue.length === 1 && !pending) {\n this.executeNext(type);\n }\n }\n insertAbort(operation, type) {\n const queue = this.queues[type];\n queue.unshift(operation);\n this.executeNext(type);\n }\n appendBlocker(type) {\n let execute;\n const promise = new Promise(resolve => {\n execute = resolve;\n });\n const operation = {\n execute,\n onStart: () => {},\n onComplete: () => {},\n onError: () => {}\n };\n this.append(operation, type);\n return promise;\n }\n executeNext(type) {\n const queue = this.queues[type];\n if (queue.length) {\n const operation = queue[0];\n try {\n // Operations are expected to result in an 'updateend' event being fired. If not, the queue will lock. Operations\n // which do not end with this event must call _onSBUpdateEnd manually\n operation.execute();\n } catch (error) {\n logger.warn(`[buffer-operation-queue]: Exception executing \"${type}\" SourceBuffer operation: ${error}`);\n operation.onError(error);\n\n // Only shift the current operation off, otherwise the updateend handler will do this for us\n const sb = this.buffers[type];\n if (!(sb != null && sb.updating)) {\n this.shiftAndExecuteNext(type);\n }\n }\n }\n }\n shiftAndExecuteNext(type) {\n this.queues[type].shift();\n this.executeNext(type);\n }\n current(type) {\n return this.queues[type][0];\n }\n}\n\nconst VIDEO_CODEC_PROFILE_REPLACE = /(avc[1234]|hvc1|hev1|dvh[1e]|vp09|av01)(?:\\.[^.,]+)+/;\nclass BufferController {\n constructor(hls) {\n // The level details used to determine duration, target-duration and live\n this.details = null;\n // cache the self generated object url to detect hijack of video tag\n this._objectUrl = null;\n // A queue of buffer operations which require the SourceBuffer to not be updating upon execution\n this.operationQueue = void 0;\n // References to event listeners for each SourceBuffer, so that they can be referenced for event removal\n this.listeners = void 0;\n this.hls = void 0;\n // The number of BUFFER_CODEC events received before any sourceBuffers are created\n this.bufferCodecEventsExpected = 0;\n // The total number of BUFFER_CODEC events received\n this._bufferCodecEventsTotal = 0;\n // A reference to the attached media element\n this.media = null;\n // A reference to the active media source\n this.mediaSource = null;\n // Last MP3 audio chunk appended\n this.lastMpegAudioChunk = null;\n this.appendSource = void 0;\n // counters\n this.appendErrors = {\n audio: 0,\n video: 0,\n audiovideo: 0\n };\n this.tracks = {};\n this.pendingTracks = {};\n this.sourceBuffer = void 0;\n this.log = void 0;\n this.warn = void 0;\n this.error = void 0;\n this._onEndStreaming = event => {\n if (!this.hls) {\n return;\n }\n this.hls.pauseBuffering();\n };\n this._onStartStreaming = event => {\n if (!this.hls) {\n return;\n }\n this.hls.resumeBuffering();\n };\n // Keep as arrow functions so that we can directly reference these functions directly as event listeners\n this._onMediaSourceOpen = () => {\n const {\n media,\n mediaSource\n } = this;\n this.log('Media source opened');\n if (media) {\n media.removeEventListener('emptied', this._onMediaEmptied);\n this.updateMediaElementDuration();\n this.hls.trigger(Events.MEDIA_ATTACHED, {\n media,\n mediaSource: mediaSource\n });\n }\n if (mediaSource) {\n // once received, don't listen anymore to sourceopen event\n mediaSource.removeEventListener('sourceopen', this._onMediaSourceOpen);\n }\n this.checkPendingTracks();\n };\n this._onMediaSourceClose = () => {\n this.log('Media source closed');\n };\n this._onMediaSourceEnded = () => {\n this.log('Media source ended');\n };\n this._onMediaEmptied = () => {\n const {\n mediaSrc,\n _objectUrl\n } = this;\n if (mediaSrc !== _objectUrl) {\n logger.error(`Media element src was set while attaching MediaSource (${_objectUrl} > ${mediaSrc})`);\n }\n };\n this.hls = hls;\n const logPrefix = '[buffer-controller]';\n this.appendSource = isManagedMediaSource(getMediaSource(hls.config.preferManagedMediaSource));\n this.log = logger.log.bind(logger, logPrefix);\n this.warn = logger.warn.bind(logger, logPrefix);\n this.error = logger.error.bind(logger, logPrefix);\n this._initSourceBuffer();\n this.registerListeners();\n }\n hasSourceTypes() {\n return this.getSourceBufferTypes().length > 0 || Object.keys(this.pendingTracks).length > 0;\n }\n destroy() {\n this.unregisterListeners();\n this.details = null;\n this.lastMpegAudioChunk = null;\n // @ts-ignore\n this.hls = null;\n }\n registerListeners() {\n const {\n hls\n } = this;\n hls.on(Events.MEDIA_ATTACHING, this.onMediaAttaching, this);\n hls.on(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.on(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.on(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.on(Events.BUFFER_RESET, this.onBufferReset, this);\n hls.on(Events.BUFFER_APPENDING, this.onBufferAppending, this);\n hls.on(Events.BUFFER_CODECS, this.onBufferCodecs, this);\n hls.on(Events.BUFFER_EOS, this.onBufferEos, this);\n hls.on(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.on(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n hls.on(Events.FRAG_PARSED, this.onFragParsed, this);\n hls.on(Events.FRAG_CHANGED, this.onFragChanged, this);\n }\n unregisterListeners() {\n const {\n hls\n } = this;\n hls.off(Events.MEDIA_ATTACHING, this.onMediaAttaching, this);\n hls.off(Events.MEDIA_DETACHING, this.onMediaDetaching, this);\n hls.off(Events.MANIFEST_LOADING, this.onManifestLoading, this);\n hls.off(Events.MANIFEST_PARSED, this.onManifestParsed, this);\n hls.off(Events.BUFFER_RESET, this.onBufferReset, this);\n hls.off(Events.BUFFER_APPENDING, this.onBufferAppending, this);\n hls.off(Events.BUFFER_CODECS, this.onBufferCodecs, this);\n hls.off(Events.BUFFER_EOS, this.onBufferEos, this);\n hls.off(Events.BUFFER_FLUSHING, this.onBufferFlushing, this);\n hls.off(Events.LEVEL_UPDATED, this.onLevelUpdated, this);\n hls.off(Events.FRAG_PARSED, this.onFragParsed, this);\n hls.off(Events.FRAG_CHANGED, this.onFragChanged, this);\n }\n _initSourceBuffer() {\n this.sourceBuffer = {};\n this.operationQueue = new BufferOperationQueue(this.sourceBuffer);\n this.listeners = {\n audio: [],\n video: [],\n audiovideo: []\n };\n this.appendErrors = {\n audio: 0,\n video: 0,\n audiovideo: 0\n };\n this.lastMpegAudioChunk = null;\n }\n onManifestLoading() {\n this.bufferCodecEventsExpected = this._bufferCodecEventsTotal = 0;\n this.details = null;\n }\n onManifestParsed(event, data) {\n // in case of alt audio 2 BUFFER_CODECS events will be triggered, one per stream controller\n // sourcebuffers will be created all at once when the expected nb of tracks will be reached\n // in case alt audio is not used, only one BUFFER_CODEC event will be fired from main stream controller\n // it will contain the expected nb of source buffers, no need to compute it\n let codecEvents = 2;\n if (data.audio && !data.video || !data.altAudio || !true) {\n codecEvents = 1;\n }\n this.bufferCodecEventsExpected = this._bufferCodecEventsTotal = codecEvents;\n this.log(`${this.bufferCodecEventsExpected} bufferCodec event(s) expected`);\n }\n onMediaAttaching(event, data) {\n const media = this.media = data.media;\n const MediaSource = getMediaSource(this.appendSource);\n if (media && MediaSource) {\n var _ms$constructor;\n const ms = this.mediaSource = new MediaSource();\n this.log(`created media source: ${(_ms$constructor = ms.constructor) == null ? void 0 : _ms$constructor.name}`);\n // MediaSource listeners are arrow functions with a lexical scope, and do not need to be bound\n ms.addEventListener('sourceopen', this._onMediaSourceOpen);\n ms.addEventListener('sourceended', this._onMediaSourceEnded);\n ms.addEventListener('sourceclose', this._onMediaSourceClose);\n if (this.appendSource) {\n ms.addEventListener('startstreaming', this._onStartStreaming);\n ms.addEventListener('endstreaming', this._onEndStreaming);\n }\n\n // cache the locally generated object url\n const objectUrl = this._objectUrl = self.URL.createObjectURL(ms);\n // link video and media Source\n if (this.appendSource) {\n try {\n media.removeAttribute('src');\n // ManagedMediaSource will not open without disableRemotePlayback set to false or source alternatives\n const MMS = self.ManagedMediaSource;\n media.disableRemotePlayback = media.disableRemotePlayback || MMS && ms instanceof MMS;\n removeSourceChildren(media);\n addSource(media, objectUrl);\n media.load();\n } catch (error) {\n media.src = objectUrl;\n }\n } else {\n media.src = objectUrl;\n }\n media.addEventListener('emptied', this._onMediaEmptied);\n }\n }\n onMediaDetaching() {\n const {\n media,\n mediaSource,\n _objectUrl\n } = this;\n if (mediaSource) {\n this.log('media source detaching');\n if (mediaSource.readyState === 'open') {\n try {\n // endOfStream could trigger exception if any sourcebuffer is in updating state\n // we don't really care about checking sourcebuffer state here,\n // as we are anyway detaching the MediaSource\n // let's just avoid this exception to propagate\n mediaSource.endOfStream();\n } catch (err) {\n this.warn(`onMediaDetaching: ${err.message} while calling endOfStream`);\n }\n }\n // Clean up the SourceBuffers by invoking onBufferReset\n this.onBufferReset();\n mediaSource.removeEventListener('sourceopen', this._onMediaSourceOpen);\n mediaSource.removeEventListener('sourceended', this._onMediaSourceEnded);\n mediaSource.removeEventListener('sourceclose', this._onMediaSourceClose);\n if (this.appendSource) {\n mediaSource.removeEventListener('startstreaming', this._onStartStreaming);\n mediaSource.removeEventListener('endstreaming', this._onEndStreaming);\n }\n\n // Detach properly the MediaSource from the HTMLMediaElement as\n // suggested in https://github.com/w3c/media-source/issues/53.\n if (media) {\n media.removeEventListener('emptied', this._onMediaEmptied);\n if (_objectUrl) {\n self.URL.revokeObjectURL(_objectUrl);\n }\n\n // clean up video tag src only if it's our own url. some external libraries might\n // hijack the video tag and change its 'src' without destroying the Hls instance first\n if (this.mediaSrc === _objectUrl) {\n media.removeAttribute('src');\n if (this.appendSource) {\n removeSourceChildren(media);\n }\n media.load();\n } else {\n this.warn('media|source.src was changed by a third party - skip cleanup');\n }\n }\n this.mediaSource = null;\n this.media = null;\n this._objectUrl = null;\n this.bufferCodecEventsExpected = this._bufferCodecEventsTotal;\n this.pendingTracks = {};\n this.tracks = {};\n }\n this.hls.trigger(Events.MEDIA_DETACHED, undefined);\n }\n onBufferReset() {\n this.getSourceBufferTypes().forEach(type => {\n this.resetBuffer(type);\n });\n this._initSourceBuffer();\n }\n resetBuffer(type) {\n const sb = this.sourceBuffer[type];\n try {\n if (sb) {\n var _this$mediaSource;\n this.removeBufferListeners(type);\n // Synchronously remove the SB from the map before the next call in order to prevent an async function from\n // accessing it\n this.sourceBuffer[type] = undefined;\n if ((_this$mediaSource = this.mediaSource) != null && _this$mediaSource.sourceBuffers.length) {\n this.mediaSource.removeSourceBuffer(sb);\n }\n }\n } catch (err) {\n this.warn(`onBufferReset ${type}`, err);\n }\n }\n onBufferCodecs(event, data) {\n const sourceBufferCount = this.getSourceBufferTypes().length;\n const trackNames = Object.keys(data);\n trackNames.forEach(trackName => {\n if (sourceBufferCount) {\n // check if SourceBuffer codec needs to change\n const track = this.tracks[trackName];\n if (track && typeof track.buffer.changeType === 'function') {\n var _trackCodec;\n const {\n id,\n codec,\n levelCodec,\n container,\n metadata\n } = data[trackName];\n const currentCodecFull = pickMostCompleteCodecName(track.codec, track.levelCodec);\n const currentCodec = currentCodecFull == null ? void 0 : currentCodecFull.replace(VIDEO_CODEC_PROFILE_REPLACE, '$1');\n let trackCodec = pickMostCompleteCodecName(codec, levelCodec);\n const nextCodec = (_trackCodec = trackCodec) == null ? void 0 : _trackCodec.replace(VIDEO_CODEC_PROFILE_REPLACE, '$1');\n if (trackCodec && currentCodec !== nextCodec) {\n if (trackName.slice(0, 5) === 'audio') {\n trackCodec = getCodecCompatibleName(trackCodec, this.appendSource);\n }\n const mimeType = `${container};codecs=${trackCodec}`;\n this.appendChangeType(trackName, mimeType);\n this.log(`switching codec ${currentCodecFull} to ${trackCodec}`);\n this.tracks[trackName] = {\n buffer: track.buffer,\n codec,\n container,\n levelCodec,\n metadata,\n id\n };\n }\n }\n } else {\n // if source buffer(s) not created yet, appended buffer tracks in this.pendingTracks\n this.pendingTracks[trackName] = data[trackName];\n }\n });\n\n // if sourcebuffers already created, do nothing ...\n if (sourceBufferCount) {\n return;\n }\n const bufferCodecEventsExpected = Math.max(this.bufferCodecEventsExpected - 1, 0);\n if (this.bufferCodecEventsExpected !== bufferCodecEventsExpected) {\n this.log(`${bufferCodecEventsExpected} bufferCodec event(s) expected ${trackNames.join(',')}`);\n this.bufferCodecEventsExpected = bufferCodecEventsExpected;\n }\n if (this.mediaSource && this.mediaSource.readyState === 'open') {\n this.checkPendingTracks();\n }\n }\n appendChangeType(type, mimeType) {\n const {\n operationQueue\n } = this;\n const operation = {\n execute: () => {\n const sb = this.sourceBuffer[type];\n if (sb) {\n this.log(`changing ${type} sourceBuffer type to ${mimeType}`);\n sb.changeType(mimeType);\n }\n operationQueue.shiftAndExecuteNext(type);\n },\n onStart: () => {},\n onComplete: () => {},\n onError: error => {\n this.warn(`Failed to change ${type} SourceBuffer type`, error);\n }\n };\n operationQueue.append(operation, type, !!this.pendingTracks[type]);\n }\n onBufferAppending(event, eventData) {\n const {\n hls,\n operationQueue,\n tracks\n } = this;\n const {\n data,\n type,\n frag,\n part,\n chunkMeta\n } = eventData;\n const chunkStats = chunkMeta.buffering[type];\n const bufferAppendingStart = self.performance.now();\n chunkStats.start = bufferAppendingStart;\n const fragBuffering = frag.stats.buffering;\n const partBuffering = part ? part.stats.buffering : null;\n if (fragBuffering.start === 0) {\n fragBuffering.start = bufferAppendingStart;\n }\n if (partBuffering && partBuffering.start === 0) {\n partBuffering.start = bufferAppendingStart;\n }\n\n // TODO: Only update timestampOffset when audio/mpeg fragment or part is not contiguous with previously appended\n // Adjusting `SourceBuffer.timestampOffset` (desired point in the timeline where the next frames should be appended)\n // in Chrome browser when we detect MPEG audio container and time delta between level PTS and `SourceBuffer.timestampOffset`\n // is greater than 100ms (this is enough to handle seek for VOD or level change for LIVE videos).\n // More info here: https://github.com/video-dev/hls.js/issues/332#issuecomment-257986486\n const audioTrack = tracks.audio;\n let checkTimestampOffset = false;\n if (type === 'audio' && (audioTrack == null ? void 0 : audioTrack.container) === 'audio/mpeg') {\n checkTimestampOffset = !this.lastMpegAudioChunk || chunkMeta.id === 1 || this.lastMpegAudioChunk.sn !== chunkMeta.sn;\n this.lastMpegAudioChunk = chunkMeta;\n }\n const fragStart = frag.start;\n const operation = {\n execute: () => {\n chunkStats.executeStart = self.performance.now();\n if (checkTimestampOffset) {\n const sb = this.sourceBuffer[type];\n if (sb) {\n const delta = fragStart - sb.timestampOffset;\n if (Math.abs(delta) >= 0.1) {\n this.log(`Updating audio SourceBuffer timestampOffset to ${fragStart} (delta: ${delta}) sn: ${frag.sn})`);\n sb.timestampOffset = fragStart;\n }\n }\n }\n this.appendExecutor(data, type);\n },\n onStart: () => {\n // logger.debug(`[buffer-controller]: ${type} SourceBuffer updatestart`);\n },\n onComplete: () => {\n // logger.debug(`[buffer-controller]: ${type} SourceBuffer updateend`);\n const end = self.performance.now();\n chunkStats.executeEnd = chunkStats.end = end;\n if (fragBuffering.first === 0) {\n fragBuffering.first = end;\n }\n if (partBuffering && partBuffering.first === 0) {\n partBuffering.first = end;\n }\n const {\n sourceBuffer\n } = this;\n const timeRanges = {};\n for (const type in sourceBuffer) {\n timeRanges[type] = BufferHelper.getBuffered(sourceBuffer[type]);\n }\n this.appendErrors[type] = 0;\n if (type === 'audio' || type === 'video') {\n this.appendErrors.audiovideo = 0;\n } else {\n this.appendErrors.audio = 0;\n this.appendErrors.video = 0;\n }\n this.hls.trigger(Events.BUFFER_APPENDED, {\n type,\n frag,\n part,\n chunkMeta,\n parent: frag.type,\n timeRanges\n });\n },\n onError: error => {\n // in case any error occured while appending, put back segment in segments table\n const event = {\n type: ErrorTypes.MEDIA_ERROR,\n parent: frag.type,\n details: ErrorDetails.BUFFER_APPEND_ERROR,\n sourceBufferName: type,\n frag,\n part,\n chunkMeta,\n error,\n err: error,\n fatal: false\n };\n if (error.code === DOMException.QUOTA_EXCEEDED_ERR) {\n // QuotaExceededError: http://www.w3.org/TR/html5/infrastructure.html#quotaexceedederror\n // let's stop appending any segments, and report BUFFER_FULL_ERROR error\n event.details = ErrorDetails.BUFFER_FULL_ERROR;\n } else {\n const appendErrorCount = ++this.appendErrors[type];\n event.details = ErrorDetails.BUFFER_APPEND_ERROR;\n /* with UHD content, we could get loop of quota exceeded error until\n browser is able to evict some data from sourcebuffer. Retrying can help recover.\n */\n this.warn(`Failed ${appendErrorCount}/${hls.config.appendErrorMaxRetry} times to append segment in \"${type}\" sourceBuffer`);\n if (appendErrorCount >= hls.config.appendErrorMaxRetry) {\n event.fatal = true;\n }\n }\n hls.trigger(Events.ERROR, event);\n }\n };\n operationQueue.append(operation, type, !!this.pendingTracks[type]);\n }\n onBufferFlushing(event, data) {\n const {\n operationQueue\n } = this;\n const flushOperation = type => ({\n execute: this.removeExecutor.bind(this, type, data.startOffset, data.endOffset),\n onStart: () => {\n // logger.debug(`[buffer-controller]: Started flushing ${data.startOffset} -> ${data.endOffset} for ${type} Source Buffer`);\n },\n onComplete: () => {\n // logger.debug(`[buffer-controller]: Finished flushing ${data.startOffset} -> ${data.endOffset} for ${type} Source Buffer`);\n this.hls.trigger(Events.BUFFER_FLUSHED, {\n type\n });\n },\n onError: error => {\n this.warn(`Failed to remove from ${type} SourceBuffer`, error);\n }\n });\n if (data.type) {\n operationQueue.append(flushOperation(data.type), data.type);\n } else {\n this.getSourceBufferTypes().forEach(type => {\n operationQueue.append(flushOperation(type), type);\n });\n }\n }\n onFragParsed(event, data) {\n const {\n frag,\n part\n } = data;\n const buffersAppendedTo = [];\n const elementaryStreams = part ? part.elementaryStreams : frag.elementaryStreams;\n if (elementaryStreams[ElementaryStreamTypes.AUDIOVIDEO]) {\n buffersAppendedTo.push('audiovideo');\n } else {\n if (elementaryStreams[ElementaryStreamTypes.AUDIO]) {\n buffersAppendedTo.push('audio');\n }\n if (elementaryStreams[ElementaryStreamTypes.VIDEO]) {\n buffersAppendedTo.push('video');\n }\n }\n const onUnblocked = () => {\n const now = self.performance.now();\n frag.stats.buffering.end = now;\n if (part) {\n part.stats.buffering.end = now;\n }\n const stats = part ? part.stats : frag.stats;\n this.hls.trigger(Events.FRAG_BUFFERED, {\n frag,\n part,\n stats,\n id: frag.type\n });\n };\n if (buffersAppendedTo.length === 0) {\n this.warn(`Fragments must have at least one ElementaryStreamType set. type: ${frag.type} level: ${frag.level} sn: ${frag.sn}`);\n }\n this.blockBuffers(onUnblocked, buffersAppendedTo);\n }\n onFragChanged(event, data) {\n this.trimBuffers();\n }\n\n // on BUFFER_EOS mark matching sourcebuffer(s) as ended and trigger checkEos()\n // an undefined data.type will mark all buffers as EOS.\n onBufferEos(event, data) {\n const ended = this.getSourceBufferTypes().reduce((acc, type) => {\n const sb = this.sourceBuffer[type];\n if (sb && (!data.type || data.type === type)) {\n sb.ending = true;\n if (!sb.ended) {\n sb.ended = true;\n this.log(`${type} sourceBuffer now EOS`);\n }\n }\n return acc && !!(!sb || sb.ended);\n }, true);\n if (ended) {\n this.log(`Queueing mediaSource.endOfStream()`);\n this.blockBuffers(() => {\n this.getSourceBufferTypes().forEach(type => {\n const sb = this.sourceBuffer[type];\n if (sb) {\n sb.ending = false;\n }\n });\n const {\n mediaSource\n } = this;\n if (!mediaSource || mediaSource.readyState !== 'open') {\n if (mediaSource) {\n this.log(`Could not call mediaSource.endOfStream(). mediaSource.readyState: ${mediaSource.readyState}`);\n }\n return;\n }\n this.log(`Calling mediaSource.endOfStream()`);\n // Allow this to throw and be caught by the enqueueing function\n mediaSource.endOfStream();\n });\n }\n }\n onLevelUpdated(event, {\n details\n }) {\n if (!details.fragments.length) {\n return;\n }\n this.details = details;\n if (this.getSourceBufferTypes().length) {\n this.blockBuffers(this.updateMediaElementDuration.bind(this));\n } else {\n this.updateMediaElementDuration();\n }\n }\n trimBuffers() {\n const {\n hls,\n details,\n media\n } = this;\n if (!media || details === null) {\n return;\n }\n const sourceBufferTypes = this.getSourceBufferTypes();\n if (!sourceBufferTypes.length) {\n return;\n }\n const config = hls.config;\n const currentTime = media.currentTime;\n const targetDuration = details.levelTargetDuration;\n\n // Support for deprecated liveBackBufferLength\n const backBufferLength = details.live && config.liveBackBufferLength !== null ? config.liveBackBufferLength : config.backBufferLength;\n if (isFiniteNumber(backBufferLength) && backBufferLength > 0) {\n const maxBackBufferLength = Math.max(backBufferLength, targetDuration);\n const targetBackBufferPosition = Math.floor(currentTime / targetDuration) * targetDuration - maxBackBufferLength;\n this.flushBackBuffer(currentTime, targetDuration, targetBackBufferPosition);\n }\n if (isFiniteNumber(config.frontBufferFlushThreshold) && config.frontBufferFlushThreshold > 0) {\n const frontBufferLength = Math.max(config.maxBufferLength, config.frontBufferFlushThreshold);\n const maxFrontBufferLength = Math.max(frontBufferLength, targetDuration);\n const targetFrontBufferPosition = Math.floor(currentTime / targetDuration) * targetDuration + maxFrontBufferLength;\n this.flushFrontBuffer(currentTime, targetDuration, targetFrontBufferPosition);\n }\n }\n flushBackBuffer(currentTime, targetDuration, targetBackBufferPosition) {\n const {\n details,\n sourceBuffer\n } = this;\n const sourceBufferTypes = this.getSourceBufferTypes();\n sourceBufferTypes.forEach(type => {\n const sb = sourceBuffer[type];\n if (sb) {\n const buffered = BufferHelper.getBuffered(sb);\n // when target buffer start exceeds actual buffer start\n if (buffered.length > 0 && targetBackBufferPosition > buffered.start(0)) {\n this.hls.trigger(Events.BACK_BUFFER_REACHED, {\n bufferEnd: targetBackBufferPosition\n });\n\n // Support for deprecated event:\n if (details != null && details.live) {\n this.hls.trigger(Events.LIVE_BACK_BUFFER_REACHED, {\n bufferEnd: targetBackBufferPosition\n });\n } else if (sb.ended && buffered.end(buffered.length - 1) - currentTime < targetDuration * 2) {\n this.log(`Cannot flush ${type} back buffer while SourceBuffer is in ended state`);\n return;\n }\n this.hls.trigger(Events.BUFFER_FLUSHING, {\n startOffset: 0,\n endOffset: targetBackBufferPosition,\n type\n });\n }\n }\n });\n }\n flushFrontBuffer(currentTime, targetDuration, targetFrontBufferPosition) {\n const {\n sourceBuffer\n } = this;\n const sourceBufferTypes = this.getSourceBufferTypes();\n sourceBufferTypes.forEach(type => {\n const sb = sourceBuffer[type];\n if (sb) {\n const buffered = BufferHelper.getBuffered(sb);\n const numBufferedRanges = buffered.length;\n // The buffer is either empty or contiguous\n if (numBufferedRanges < 2) {\n return;\n }\n const bufferStart = buffered.start(numBufferedRanges - 1);\n const bufferEnd = buffered.end(numBufferedRanges - 1);\n // No flush if we can tolerate the current buffer length or the current buffer range we would flush is contiguous with current position\n if (targetFrontBufferPosition > bufferStart || currentTime >= bufferStart && currentTime <= bufferEnd) {\n return;\n } else if (sb.ended && currentTime - bufferEnd < 2 * targetDuration) {\n this.log(`Cannot flush ${type} front buffer while SourceBuffer is in ended state`);\n return;\n }\n this.hls.trigger(Events.BUFFER_FLUSHING, {\n startOffset: bufferStart,\n endOffset: Infinity,\n type\n });\n }\n });\n }\n\n /**\n * Update Media Source duration to current level duration or override to Infinity if configuration parameter\n * 'liveDurationInfinity` is set to `true`\n * More details: https://github.com/video-dev/hls.js/issues/355\n */\n updateMediaElementDuration() {\n if (!this.details || !this.media || !this.mediaSource || this.mediaSource.readyState !== 'open') {\n return;\n }\n const {\n details,\n hls,\n media,\n mediaSource\n } = this;\n const levelDuration = details.fragments[0].start + details.totalduration;\n const mediaDuration = media.duration;\n const msDuration = isFiniteNumber(mediaSource.duration) ? mediaSource.duration : 0;\n if (details.live && hls.config.liveDurationInfinity) {\n // Override duration to Infinity\n mediaSource.duration = Infinity;\n this.updateSeekableRange(details);\n } else if (levelDuration > msDuration && levelDuration > mediaDuration || !isFiniteNumber(mediaDuration)) {\n // levelDuration was the last value we set.\n // not using mediaSource.duration as the browser may tweak this value\n // only update Media Source duration if its value increase, this is to avoid\n // flushing already buffered portion when switching between quality level\n this.log(`Updating Media Source duration to ${levelDuration.toFixed(3)}`);\n mediaSource.duration = levelDuration;\n }\n }\n updateSeekableRange(levelDetails) {\n const mediaSource = this.mediaSource;\n const fragments = levelDetails.fragments;\n const len = fragments.length;\n if (len && levelDetails.live && mediaSource != null && mediaSource.setLiveSeekableRange) {\n const start = Math.max(0, fragments[0].start);\n const end = Math.max(start, start + levelDetails.totalduration);\n this.log(`Media Source duration is set to ${mediaSource.duration}. Setting seekable range to ${start}-${end}.`);\n mediaSource.setLiveSeekableRange(start, end);\n }\n }\n checkPendingTracks() {\n const {\n bufferCodecEventsExpected,\n operationQueue,\n pendingTracks\n } = this;\n\n // Check if we've received all of the expected bufferCodec events. When none remain, create all the sourceBuffers at once.\n // This is important because the MSE spec allows implementations to throw QuotaExceededErrors if creating new sourceBuffers after\n // data has been appended to existing ones.\n // 2 tracks is the max (one for audio, one for video). If we've reach this max go ahead and create the buffers.\n const pendingTracksCount = Object.keys(pendingTracks).length;\n if (pendingTracksCount && (!bufferCodecEventsExpected || pendingTracksCount === 2 || 'audiovideo' in pendingTracks)) {\n // ok, let's create them now !\n this.createSourceBuffers(pendingTracks);\n this.pendingTracks = {};\n // append any pending segments now !\n const buffers = this.getSourceBufferTypes();\n if (buffers.length) {\n this.hls.trigger(Events.BUFFER_CREATED, {\n tracks: this.tracks\n });\n buffers.forEach(type => {\n operationQueue.executeNext(type);\n });\n } else {\n const error = new Error('could not create source buffer for media codec(s)');\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.BUFFER_INCOMPATIBLE_CODECS_ERROR,\n fatal: true,\n error,\n reason: error.message\n });\n }\n }\n }\n createSourceBuffers(tracks) {\n const {\n sourceBuffer,\n mediaSource\n } = this;\n if (!mediaSource) {\n throw Error('createSourceBuffers called when mediaSource was null');\n }\n for (const trackName in tracks) {\n if (!sourceBuffer[trackName]) {\n var _track$levelCodec;\n const track = tracks[trackName];\n if (!track) {\n throw Error(`source buffer exists for track ${trackName}, however track does not`);\n }\n // use levelCodec as first priority unless it contains multiple comma-separated codec values\n let codec = ((_track$levelCodec = track.levelCodec) == null ? void 0 : _track$levelCodec.indexOf(',')) === -1 ? track.levelCodec : track.codec;\n if (codec) {\n if (trackName.slice(0, 5) === 'audio') {\n codec = getCodecCompatibleName(codec, this.appendSource);\n }\n }\n const mimeType = `${track.container};codecs=${codec}`;\n this.log(`creating sourceBuffer(${mimeType})`);\n try {\n const sb = sourceBuffer[trackName] = mediaSource.addSourceBuffer(mimeType);\n const sbName = trackName;\n this.addBufferListener(sbName, 'updatestart', this._onSBUpdateStart);\n this.addBufferListener(sbName, 'updateend', this._onSBUpdateEnd);\n this.addBufferListener(sbName, 'error', this._onSBUpdateError);\n // ManagedSourceBuffer bufferedchange event\n if (this.appendSource) {\n this.addBufferListener(sbName, 'bufferedchange', (type, event) => {\n // If media was ejected check for a change. Added ranges are redundant with changes on 'updateend' event.\n const removedRanges = event.removedRanges;\n if (removedRanges != null && removedRanges.length) {\n this.hls.trigger(Events.BUFFER_FLUSHED, {\n type: trackName\n });\n }\n });\n }\n this.tracks[trackName] = {\n buffer: sb,\n codec: codec,\n container: track.container,\n levelCodec: track.levelCodec,\n metadata: track.metadata,\n id: track.id\n };\n } catch (err) {\n this.error(`error while trying to add sourceBuffer: ${err.message}`);\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.BUFFER_ADD_CODEC_ERROR,\n fatal: false,\n error: err,\n sourceBufferName: trackName,\n mimeType: mimeType\n });\n }\n }\n }\n }\n get mediaSrc() {\n var _this$media;\n const media = ((_this$media = this.media) == null ? void 0 : _this$media.firstChild) || this.media;\n return media == null ? void 0 : media.src;\n }\n _onSBUpdateStart(type) {\n const {\n operationQueue\n } = this;\n const operation = operationQueue.current(type);\n operation.onStart();\n }\n _onSBUpdateEnd(type) {\n var _this$mediaSource2;\n if (((_this$mediaSource2 = this.mediaSource) == null ? void 0 : _this$mediaSource2.readyState) === 'closed') {\n this.resetBuffer(type);\n return;\n }\n const {\n operationQueue\n } = this;\n const operation = operationQueue.current(type);\n operation.onComplete();\n operationQueue.shiftAndExecuteNext(type);\n }\n _onSBUpdateError(type, event) {\n var _this$mediaSource3;\n const error = new Error(`${type} SourceBuffer error. MediaSource readyState: ${(_this$mediaSource3 = this.mediaSource) == null ? void 0 : _this$mediaSource3.readyState}`);\n this.error(`${error}`, event);\n // according to http://www.w3.org/TR/media-source/#sourcebuffer-append-error\n // SourceBuffer errors are not necessarily fatal; if so, the HTMLMediaElement will fire an error event\n this.hls.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.BUFFER_APPENDING_ERROR,\n sourceBufferName: type,\n error,\n fatal: false\n });\n // updateend is always fired after error, so we'll allow that to shift the current operation off of the queue\n const operation = this.operationQueue.current(type);\n if (operation) {\n operation.onError(error);\n }\n }\n\n // This method must result in an updateend event; if remove is not called, _onSBUpdateEnd must be called manually\n removeExecutor(type, startOffset, endOffset) {\n const {\n media,\n mediaSource,\n operationQueue,\n sourceBuffer\n } = this;\n const sb = sourceBuffer[type];\n if (!media || !mediaSource || !sb) {\n this.warn(`Attempting to remove from the ${type} SourceBuffer, but it does not exist`);\n operationQueue.shiftAndExecuteNext(type);\n return;\n }\n const mediaDuration = isFiniteNumber(media.duration) ? media.duration : Infinity;\n const msDuration = isFiniteNumber(mediaSource.duration) ? mediaSource.duration : Infinity;\n const removeStart = Math.max(0, startOffset);\n const removeEnd = Math.min(endOffset, mediaDuration, msDuration);\n if (removeEnd > removeStart && (!sb.ending || sb.ended)) {\n sb.ended = false;\n this.log(`Removing [${removeStart},${removeEnd}] from the ${type} SourceBuffer`);\n sb.remove(removeStart, removeEnd);\n } else {\n // Cycle the queue\n operationQueue.shiftAndExecuteNext(type);\n }\n }\n\n // This method must result in an updateend event; if append is not called, _onSBUpdateEnd must be called manually\n appendExecutor(data, type) {\n const sb = this.sourceBuffer[type];\n if (!sb) {\n if (!this.pendingTracks[type]) {\n throw new Error(`Attempting to append to the ${type} SourceBuffer, but it does not exist`);\n }\n return;\n }\n sb.ended = false;\n sb.appendBuffer(data);\n }\n\n // Enqueues an operation to each SourceBuffer queue which, upon execution, resolves a promise. When all promises\n // resolve, the onUnblocked function is executed. Functions calling this method do not need to unblock the queue\n // upon completion, since we already do it here\n blockBuffers(onUnblocked, buffers = this.getSourceBufferTypes()) {\n if (!buffers.length) {\n this.log('Blocking operation requested, but no SourceBuffers exist');\n Promise.resolve().then(onUnblocked);\n return;\n }\n const {\n operationQueue\n } = this;\n\n // logger.debug(`[buffer-controller]: Blocking ${buffers} SourceBuffer`);\n const blockingOperations = buffers.map(type => operationQueue.appendBlocker(type));\n Promise.all(blockingOperations).then(() => {\n // logger.debug(`[buffer-controller]: Blocking operation resolved; unblocking ${buffers} SourceBuffer`);\n onUnblocked();\n buffers.forEach(type => {\n const sb = this.sourceBuffer[type];\n // Only cycle the queue if the SB is not updating. There's a bug in Chrome which sets the SB updating flag to\n // true when changing the MediaSource duration (https://bugs.chromium.org/p/chromium/issues/detail?id=959359&can=2&q=mediasource%20duration)\n // While this is a workaround, it's probably useful to have around\n if (!(sb != null && sb.updating)) {\n operationQueue.shiftAndExecuteNext(type);\n }\n });\n });\n }\n getSourceBufferTypes() {\n return Object.keys(this.sourceBuffer);\n }\n addBufferListener(type, event, fn) {\n const buffer = this.sourceBuffer[type];\n if (!buffer) {\n return;\n }\n const listener = fn.bind(this, type);\n this.listeners[type].push({\n event,\n listener\n });\n buffer.addEventListener(event, listener);\n }\n removeBufferListeners(type) {\n const buffer = this.sourceBuffer[type];\n if (!buffer) {\n return;\n }\n this.listeners[type].forEach(l => {\n buffer.removeEventListener(l.event, l.listener);\n });\n }\n}\nfunction removeSourceChildren(node) {\n const sourceChildren = node.querySelectorAll('source');\n [].slice.call(sourceChildren).forEach(source => {\n node.removeChild(source);\n });\n}\nfunction addSource(media, url) {\n const source = self.document.createElement('source');\n source.type = 'video/mp4';\n source.src = url;\n media.appendChild(source);\n}\n\n/**\n *\n * This code was ported from the dash.js project at:\n * https://github.com/Dash-Industry-Forum/dash.js/blob/development/externals/cea608-parser.js\n * https://github.com/Dash-Industry-Forum/dash.js/commit/8269b26a761e0853bb21d78780ed945144ecdd4d#diff-71bc295a2d6b6b7093a1d3290d53a4b2\n *\n * The original copyright appears below:\n *\n * The copyright in this software is being made available under the BSD License,\n * included below. This software may be subject to other third party and contributor\n * rights, including patent rights, and no such rights are granted under this license.\n *\n * Copyright (c) 2015-2016, DASH Industry Forum.\n * All rights reserved.\n *\n * Redistribution and use in source and binary forms, with or without modification,\n * are permitted provided that the following conditions are met:\n * 1. Redistributions of source code must retain the above copyright notice, this\n * list of conditions and the following disclaimer.\n * * Redistributions in binary form must reproduce the above copyright notice,\n * this list of conditions and the following disclaimer in the documentation and/or\n * other materials provided with the distribution.\n * 2. Neither the name of Dash Industry Forum nor the names of its\n * contributors may be used to endorse or promote products derived from this software\n * without specific prior written permission.\n *\n * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS AS IS AND ANY\n * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED\n * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.\n * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,\n * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT\n * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR\n * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,\n * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n * POSSIBILITY OF SUCH DAMAGE.\n */\n/**\n * Exceptions from regular ASCII. CodePoints are mapped to UTF-16 codes\n */\n\nconst specialCea608CharsCodes = {\n 0x2a: 0xe1,\n // lowercase a, acute accent\n 0x5c: 0xe9,\n // lowercase e, acute accent\n 0x5e: 0xed,\n // lowercase i, acute accent\n 0x5f: 0xf3,\n // lowercase o, acute accent\n 0x60: 0xfa,\n // lowercase u, acute accent\n 0x7b: 0xe7,\n // lowercase c with cedilla\n 0x7c: 0xf7,\n // division symbol\n 0x7d: 0xd1,\n // uppercase N tilde\n 0x7e: 0xf1,\n // lowercase n tilde\n 0x7f: 0x2588,\n // Full block\n // THIS BLOCK INCLUDES THE 16 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS\n // THAT COME FROM HI BYTE=0x11 AND LOW BETWEEN 0x30 AND 0x3F\n // THIS MEANS THAT \\x50 MUST BE ADDED TO THE VALUES\n 0x80: 0xae,\n // Registered symbol (R)\n 0x81: 0xb0,\n // degree sign\n 0x82: 0xbd,\n // 1/2 symbol\n 0x83: 0xbf,\n // Inverted (open) question mark\n 0x84: 0x2122,\n // Trademark symbol (TM)\n 0x85: 0xa2,\n // Cents symbol\n 0x86: 0xa3,\n // Pounds sterling\n 0x87: 0x266a,\n // Music 8'th note\n 0x88: 0xe0,\n // lowercase a, grave accent\n 0x89: 0x20,\n // transparent space (regular)\n 0x8a: 0xe8,\n // lowercase e, grave accent\n 0x8b: 0xe2,\n // lowercase a, circumflex accent\n 0x8c: 0xea,\n // lowercase e, circumflex accent\n 0x8d: 0xee,\n // lowercase i, circumflex accent\n 0x8e: 0xf4,\n // lowercase o, circumflex accent\n 0x8f: 0xfb,\n // lowercase u, circumflex accent\n // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS\n // THAT COME FROM HI BYTE=0x12 AND LOW BETWEEN 0x20 AND 0x3F\n 0x90: 0xc1,\n // capital letter A with acute\n 0x91: 0xc9,\n // capital letter E with acute\n 0x92: 0xd3,\n // capital letter O with acute\n 0x93: 0xda,\n // capital letter U with acute\n 0x94: 0xdc,\n // capital letter U with diaresis\n 0x95: 0xfc,\n // lowercase letter U with diaeresis\n 0x96: 0x2018,\n // opening single quote\n 0x97: 0xa1,\n // inverted exclamation mark\n 0x98: 0x2a,\n // asterisk\n 0x99: 0x2019,\n // closing single quote\n 0x9a: 0x2501,\n // box drawings heavy horizontal\n 0x9b: 0xa9,\n // copyright sign\n 0x9c: 0x2120,\n // Service mark\n 0x9d: 0x2022,\n // (round) bullet\n 0x9e: 0x201c,\n // Left double quotation mark\n 0x9f: 0x201d,\n // Right double quotation mark\n 0xa0: 0xc0,\n // uppercase A, grave accent\n 0xa1: 0xc2,\n // uppercase A, circumflex\n 0xa2: 0xc7,\n // uppercase C with cedilla\n 0xa3: 0xc8,\n // uppercase E, grave accent\n 0xa4: 0xca,\n // uppercase E, circumflex\n 0xa5: 0xcb,\n // capital letter E with diaresis\n 0xa6: 0xeb,\n // lowercase letter e with diaresis\n 0xa7: 0xce,\n // uppercase I, circumflex\n 0xa8: 0xcf,\n // uppercase I, with diaresis\n 0xa9: 0xef,\n // lowercase i, with diaresis\n 0xaa: 0xd4,\n // uppercase O, circumflex\n 0xab: 0xd9,\n // uppercase U, grave accent\n 0xac: 0xf9,\n // lowercase u, grave accent\n 0xad: 0xdb,\n // uppercase U, circumflex\n 0xae: 0xab,\n // left-pointing double angle quotation mark\n 0xaf: 0xbb,\n // right-pointing double angle quotation mark\n // THIS BLOCK INCLUDES THE 32 EXTENDED (TWO-BYTE) LINE 21 CHARACTERS\n // THAT COME FROM HI BYTE=0x13 AND LOW BETWEEN 0x20 AND 0x3F\n 0xb0: 0xc3,\n // Uppercase A, tilde\n 0xb1: 0xe3,\n // Lowercase a, tilde\n 0xb2: 0xcd,\n // Uppercase I, acute accent\n 0xb3: 0xcc,\n // Uppercase I, grave accent\n 0xb4: 0xec,\n // Lowercase i, grave accent\n 0xb5: 0xd2,\n // Uppercase O, grave accent\n 0xb6: 0xf2,\n // Lowercase o, grave accent\n 0xb7: 0xd5,\n // Uppercase O, tilde\n 0xb8: 0xf5,\n // Lowercase o, tilde\n 0xb9: 0x7b,\n // Open curly brace\n 0xba: 0x7d,\n // Closing curly brace\n 0xbb: 0x5c,\n // Backslash\n 0xbc: 0x5e,\n // Caret\n 0xbd: 0x5f,\n // Underscore\n 0xbe: 0x7c,\n // Pipe (vertical line)\n 0xbf: 0x223c,\n // Tilde operator\n 0xc0: 0xc4,\n // Uppercase A, umlaut\n 0xc1: 0xe4,\n // Lowercase A, umlaut\n 0xc2: 0xd6,\n // Uppercase O, umlaut\n 0xc3: 0xf6,\n // Lowercase o, umlaut\n 0xc4: 0xdf,\n // Esszett (sharp S)\n 0xc5: 0xa5,\n // Yen symbol\n 0xc6: 0xa4,\n // Generic currency sign\n 0xc7: 0x2503,\n // Box drawings heavy vertical\n 0xc8: 0xc5,\n // Uppercase A, ring\n 0xc9: 0xe5,\n // Lowercase A, ring\n 0xca: 0xd8,\n // Uppercase O, stroke\n 0xcb: 0xf8,\n // Lowercase o, strok\n 0xcc: 0x250f,\n // Box drawings heavy down and right\n 0xcd: 0x2513,\n // Box drawings heavy down and left\n 0xce: 0x2517,\n // Box drawings heavy up and right\n 0xcf: 0x251b // Box drawings heavy up and left\n};\n\n/**\n * Utils\n */\nconst getCharForByte = byte => String.fromCharCode(specialCea608CharsCodes[byte] || byte);\nconst NR_ROWS = 15;\nconst NR_COLS = 100;\n// Tables to look up row from PAC data\nconst rowsLowCh1 = {\n 0x11: 1,\n 0x12: 3,\n 0x15: 5,\n 0x16: 7,\n 0x17: 9,\n 0x10: 11,\n 0x13: 12,\n 0x14: 14\n};\nconst rowsHighCh1 = {\n 0x11: 2,\n 0x12: 4,\n 0x15: 6,\n 0x16: 8,\n 0x17: 10,\n 0x13: 13,\n 0x14: 15\n};\nconst rowsLowCh2 = {\n 0x19: 1,\n 0x1a: 3,\n 0x1d: 5,\n 0x1e: 7,\n 0x1f: 9,\n 0x18: 11,\n 0x1b: 12,\n 0x1c: 14\n};\nconst rowsHighCh2 = {\n 0x19: 2,\n 0x1a: 4,\n 0x1d: 6,\n 0x1e: 8,\n 0x1f: 10,\n 0x1b: 13,\n 0x1c: 15\n};\nconst backgroundColors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'black', 'transparent'];\nclass CaptionsLogger {\n constructor() {\n this.time = null;\n this.verboseLevel = 0;\n }\n log(severity, msg) {\n if (this.verboseLevel >= severity) {\n const m = typeof msg === 'function' ? msg() : msg;\n logger.log(`${this.time} [${severity}] ${m}`);\n }\n }\n}\nconst numArrayToHexArray = function numArrayToHexArray(numArray) {\n const hexArray = [];\n for (let j = 0; j < numArray.length; j++) {\n hexArray.push(numArray[j].toString(16));\n }\n return hexArray;\n};\nclass PenState {\n constructor() {\n this.foreground = 'white';\n this.underline = false;\n this.italics = false;\n this.background = 'black';\n this.flash = false;\n }\n reset() {\n this.foreground = 'white';\n this.underline = false;\n this.italics = false;\n this.background = 'black';\n this.flash = false;\n }\n setStyles(styles) {\n const attribs = ['foreground', 'underline', 'italics', 'background', 'flash'];\n for (let i = 0; i < attribs.length; i++) {\n const style = attribs[i];\n if (styles.hasOwnProperty(style)) {\n this[style] = styles[style];\n }\n }\n }\n isDefault() {\n return this.foreground === 'white' && !this.underline && !this.italics && this.background === 'black' && !this.flash;\n }\n equals(other) {\n return this.foreground === other.foreground && this.underline === other.underline && this.italics === other.italics && this.background === other.background && this.flash === other.flash;\n }\n copy(newPenState) {\n this.foreground = newPenState.foreground;\n this.underline = newPenState.underline;\n this.italics = newPenState.italics;\n this.background = newPenState.background;\n this.flash = newPenState.flash;\n }\n toString() {\n return 'color=' + this.foreground + ', underline=' + this.underline + ', italics=' + this.italics + ', background=' + this.background + ', flash=' + this.flash;\n }\n}\n\n/**\n * Unicode character with styling and background.\n * @constructor\n */\nclass StyledUnicodeChar {\n constructor() {\n this.uchar = ' ';\n this.penState = new PenState();\n }\n reset() {\n this.uchar = ' ';\n this.penState.reset();\n }\n setChar(uchar, newPenState) {\n this.uchar = uchar;\n this.penState.copy(newPenState);\n }\n setPenState(newPenState) {\n this.penState.copy(newPenState);\n }\n equals(other) {\n return this.uchar === other.uchar && this.penState.equals(other.penState);\n }\n copy(newChar) {\n this.uchar = newChar.uchar;\n this.penState.copy(newChar.penState);\n }\n isEmpty() {\n return this.uchar === ' ' && this.penState.isDefault();\n }\n}\n\n/**\n * CEA-608 row consisting of NR_COLS instances of StyledUnicodeChar.\n * @constructor\n */\nclass Row {\n constructor(logger) {\n this.chars = [];\n this.pos = 0;\n this.currPenState = new PenState();\n this.cueStartTime = null;\n this.logger = void 0;\n for (let i = 0; i < NR_COLS; i++) {\n this.chars.push(new StyledUnicodeChar());\n }\n this.logger = logger;\n }\n equals(other) {\n for (let i = 0; i < NR_COLS; i++) {\n if (!this.chars[i].equals(other.chars[i])) {\n return false;\n }\n }\n return true;\n }\n copy(other) {\n for (let i = 0; i < NR_COLS; i++) {\n this.chars[i].copy(other.chars[i]);\n }\n }\n isEmpty() {\n let empty = true;\n for (let i = 0; i < NR_COLS; i++) {\n if (!this.chars[i].isEmpty()) {\n empty = false;\n break;\n }\n }\n return empty;\n }\n\n /**\n * Set the cursor to a valid column.\n */\n setCursor(absPos) {\n if (this.pos !== absPos) {\n this.pos = absPos;\n }\n if (this.pos < 0) {\n this.logger.log(3, 'Negative cursor position ' + this.pos);\n this.pos = 0;\n } else if (this.pos > NR_COLS) {\n this.logger.log(3, 'Too large cursor position ' + this.pos);\n this.pos = NR_COLS;\n }\n }\n\n /**\n * Move the cursor relative to current position.\n */\n moveCursor(relPos) {\n const newPos = this.pos + relPos;\n if (relPos > 1) {\n for (let i = this.pos + 1; i < newPos + 1; i++) {\n this.chars[i].setPenState(this.currPenState);\n }\n }\n this.setCursor(newPos);\n }\n\n /**\n * Backspace, move one step back and clear character.\n */\n backSpace() {\n this.moveCursor(-1);\n this.chars[this.pos].setChar(' ', this.currPenState);\n }\n insertChar(byte) {\n if (byte >= 0x90) {\n // Extended char\n this.backSpace();\n }\n const char = getCharForByte(byte);\n if (this.pos >= NR_COLS) {\n this.logger.log(0, () => 'Cannot insert ' + byte.toString(16) + ' (' + char + ') at position ' + this.pos + '. Skipping it!');\n return;\n }\n this.chars[this.pos].setChar(char, this.currPenState);\n this.moveCursor(1);\n }\n clearFromPos(startPos) {\n let i;\n for (i = startPos; i < NR_COLS; i++) {\n this.chars[i].reset();\n }\n }\n clear() {\n this.clearFromPos(0);\n this.pos = 0;\n this.currPenState.reset();\n }\n clearToEndOfRow() {\n this.clearFromPos(this.pos);\n }\n getTextString() {\n const chars = [];\n let empty = true;\n for (let i = 0; i < NR_COLS; i++) {\n const char = this.chars[i].uchar;\n if (char !== ' ') {\n empty = false;\n }\n chars.push(char);\n }\n if (empty) {\n return '';\n } else {\n return chars.join('');\n }\n }\n setPenStyles(styles) {\n this.currPenState.setStyles(styles);\n const currChar = this.chars[this.pos];\n currChar.setPenState(this.currPenState);\n }\n}\n\n/**\n * Keep a CEA-608 screen of 32x15 styled characters\n * @constructor\n */\nclass CaptionScreen {\n constructor(logger) {\n this.rows = [];\n this.currRow = NR_ROWS - 1;\n this.nrRollUpRows = null;\n this.lastOutputScreen = null;\n this.logger = void 0;\n for (let i = 0; i < NR_ROWS; i++) {\n this.rows.push(new Row(logger));\n }\n this.logger = logger;\n }\n reset() {\n for (let i = 0; i < NR_ROWS; i++) {\n this.rows[i].clear();\n }\n this.currRow = NR_ROWS - 1;\n }\n equals(other) {\n let equal = true;\n for (let i = 0; i < NR_ROWS; i++) {\n if (!this.rows[i].equals(other.rows[i])) {\n equal = false;\n break;\n }\n }\n return equal;\n }\n copy(other) {\n for (let i = 0; i < NR_ROWS; i++) {\n this.rows[i].copy(other.rows[i]);\n }\n }\n isEmpty() {\n let empty = true;\n for (let i = 0; i < NR_ROWS; i++) {\n if (!this.rows[i].isEmpty()) {\n empty = false;\n break;\n }\n }\n return empty;\n }\n backSpace() {\n const row = this.rows[this.currRow];\n row.backSpace();\n }\n clearToEndOfRow() {\n const row = this.rows[this.currRow];\n row.clearToEndOfRow();\n }\n\n /**\n * Insert a character (without styling) in the current row.\n */\n insertChar(char) {\n const row = this.rows[this.currRow];\n row.insertChar(char);\n }\n setPen(styles) {\n const row = this.rows[this.currRow];\n row.setPenStyles(styles);\n }\n moveCursor(relPos) {\n const row = this.rows[this.currRow];\n row.moveCursor(relPos);\n }\n setCursor(absPos) {\n this.logger.log(2, 'setCursor: ' + absPos);\n const row = this.rows[this.currRow];\n row.setCursor(absPos);\n }\n setPAC(pacData) {\n this.logger.log(2, () => 'pacData = ' + JSON.stringify(pacData));\n let newRow = pacData.row - 1;\n if (this.nrRollUpRows && newRow < this.nrRollUpRows - 1) {\n newRow = this.nrRollUpRows - 1;\n }\n\n // Make sure this only affects Roll-up Captions by checking this.nrRollUpRows\n if (this.nrRollUpRows && this.currRow !== newRow) {\n // clear all rows first\n for (let i = 0; i < NR_ROWS; i++) {\n this.rows[i].clear();\n }\n\n // Copy this.nrRollUpRows rows from lastOutputScreen and place it in the newRow location\n // topRowIndex - the start of rows to copy (inclusive index)\n const topRowIndex = this.currRow + 1 - this.nrRollUpRows;\n // We only copy if the last position was already shown.\n // We use the cueStartTime value to check this.\n const lastOutputScreen = this.lastOutputScreen;\n if (lastOutputScreen) {\n const prevLineTime = lastOutputScreen.rows[topRowIndex].cueStartTime;\n const time = this.logger.time;\n if (prevLineTime !== null && time !== null && prevLineTime < time) {\n for (let i = 0; i < this.nrRollUpRows; i++) {\n this.rows[newRow - this.nrRollUpRows + i + 1].copy(lastOutputScreen.rows[topRowIndex + i]);\n }\n }\n }\n }\n this.currRow = newRow;\n const row = this.rows[this.currRow];\n if (pacData.indent !== null) {\n const indent = pacData.indent;\n const prevPos = Math.max(indent - 1, 0);\n row.setCursor(pacData.indent);\n pacData.color = row.chars[prevPos].penState.foreground;\n }\n const styles = {\n foreground: pacData.color,\n underline: pacData.underline,\n italics: pacData.italics,\n background: 'black',\n flash: false\n };\n this.setPen(styles);\n }\n\n /**\n * Set background/extra foreground, but first do back_space, and then insert space (backwards compatibility).\n */\n setBkgData(bkgData) {\n this.logger.log(2, () => 'bkgData = ' + JSON.stringify(bkgData));\n this.backSpace();\n this.setPen(bkgData);\n this.insertChar(0x20); // Space\n }\n setRollUpRows(nrRows) {\n this.nrRollUpRows = nrRows;\n }\n rollUp() {\n if (this.nrRollUpRows === null) {\n this.logger.log(3, 'roll_up but nrRollUpRows not set yet');\n return; // Not properly setup\n }\n this.logger.log(1, () => this.getDisplayText());\n const topRowIndex = this.currRow + 1 - this.nrRollUpRows;\n const topRow = this.rows.splice(topRowIndex, 1)[0];\n topRow.clear();\n this.rows.splice(this.currRow, 0, topRow);\n this.logger.log(2, 'Rolling up');\n // this.logger.log(VerboseLevel.TEXT, this.get_display_text())\n }\n\n /**\n * Get all non-empty rows with as unicode text.\n */\n getDisplayText(asOneRow) {\n asOneRow = asOneRow || false;\n const displayText = [];\n let text = '';\n let rowNr = -1;\n for (let i = 0; i < NR_ROWS; i++) {\n const rowText = this.rows[i].getTextString();\n if (rowText) {\n rowNr = i + 1;\n if (asOneRow) {\n displayText.push('Row ' + rowNr + \": '\" + rowText + \"'\");\n } else {\n displayText.push(rowText.trim());\n }\n }\n }\n if (displayText.length > 0) {\n if (asOneRow) {\n text = '[' + displayText.join(' | ') + ']';\n } else {\n text = displayText.join('\\n');\n }\n }\n return text;\n }\n getTextAndFormat() {\n return this.rows;\n }\n}\n\n// var modes = ['MODE_ROLL-UP', 'MODE_POP-ON', 'MODE_PAINT-ON', 'MODE_TEXT'];\n\nclass Cea608Channel {\n constructor(channelNumber, outputFilter, logger) {\n this.chNr = void 0;\n this.outputFilter = void 0;\n this.mode = void 0;\n this.verbose = void 0;\n this.displayedMemory = void 0;\n this.nonDisplayedMemory = void 0;\n this.lastOutputScreen = void 0;\n this.currRollUpRow = void 0;\n this.writeScreen = void 0;\n this.cueStartTime = void 0;\n this.logger = void 0;\n this.chNr = channelNumber;\n this.outputFilter = outputFilter;\n this.mode = null;\n this.verbose = 0;\n this.displayedMemory = new CaptionScreen(logger);\n this.nonDisplayedMemory = new CaptionScreen(logger);\n this.lastOutputScreen = new CaptionScreen(logger);\n this.currRollUpRow = this.displayedMemory.rows[NR_ROWS - 1];\n this.writeScreen = this.displayedMemory;\n this.mode = null;\n this.cueStartTime = null; // Keeps track of where a cue started.\n this.logger = logger;\n }\n reset() {\n this.mode = null;\n this.displayedMemory.reset();\n this.nonDisplayedMemory.reset();\n this.lastOutputScreen.reset();\n this.outputFilter.reset();\n this.currRollUpRow = this.displayedMemory.rows[NR_ROWS - 1];\n this.writeScreen = this.displayedMemory;\n this.mode = null;\n this.cueStartTime = null;\n }\n getHandler() {\n return this.outputFilter;\n }\n setHandler(newHandler) {\n this.outputFilter = newHandler;\n }\n setPAC(pacData) {\n this.writeScreen.setPAC(pacData);\n }\n setBkgData(bkgData) {\n this.writeScreen.setBkgData(bkgData);\n }\n setMode(newMode) {\n if (newMode === this.mode) {\n return;\n }\n this.mode = newMode;\n this.logger.log(2, () => 'MODE=' + newMode);\n if (this.mode === 'MODE_POP-ON') {\n this.writeScreen = this.nonDisplayedMemory;\n } else {\n this.writeScreen = this.displayedMemory;\n this.writeScreen.reset();\n }\n if (this.mode !== 'MODE_ROLL-UP') {\n this.displayedMemory.nrRollUpRows = null;\n this.nonDisplayedMemory.nrRollUpRows = null;\n }\n this.mode = newMode;\n }\n insertChars(chars) {\n for (let i = 0; i < chars.length; i++) {\n this.writeScreen.insertChar(chars[i]);\n }\n const screen = this.writeScreen === this.displayedMemory ? 'DISP' : 'NON_DISP';\n this.logger.log(2, () => screen + ': ' + this.writeScreen.getDisplayText(true));\n if (this.mode === 'MODE_PAINT-ON' || this.mode === 'MODE_ROLL-UP') {\n this.logger.log(1, () => 'DISPLAYED: ' + this.displayedMemory.getDisplayText(true));\n this.outputDataUpdate();\n }\n }\n ccRCL() {\n // Resume Caption Loading (switch mode to Pop On)\n this.logger.log(2, 'RCL - Resume Caption Loading');\n this.setMode('MODE_POP-ON');\n }\n ccBS() {\n // BackSpace\n this.logger.log(2, 'BS - BackSpace');\n if (this.mode === 'MODE_TEXT') {\n return;\n }\n this.writeScreen.backSpace();\n if (this.writeScreen === this.displayedMemory) {\n this.outputDataUpdate();\n }\n }\n ccAOF() {\n // Reserved (formerly Alarm Off)\n }\n ccAON() {\n // Reserved (formerly Alarm On)\n }\n ccDER() {\n // Delete to End of Row\n this.logger.log(2, 'DER- Delete to End of Row');\n this.writeScreen.clearToEndOfRow();\n this.outputDataUpdate();\n }\n ccRU(nrRows) {\n // Roll-Up Captions-2,3,or 4 Rows\n this.logger.log(2, 'RU(' + nrRows + ') - Roll Up');\n this.writeScreen = this.displayedMemory;\n this.setMode('MODE_ROLL-UP');\n this.writeScreen.setRollUpRows(nrRows);\n }\n ccFON() {\n // Flash On\n this.logger.log(2, 'FON - Flash On');\n this.writeScreen.setPen({\n flash: true\n });\n }\n ccRDC() {\n // Resume Direct Captioning (switch mode to PaintOn)\n this.logger.log(2, 'RDC - Resume Direct Captioning');\n this.setMode('MODE_PAINT-ON');\n }\n ccTR() {\n // Text Restart in text mode (not supported, however)\n this.logger.log(2, 'TR');\n this.setMode('MODE_TEXT');\n }\n ccRTD() {\n // Resume Text Display in Text mode (not supported, however)\n this.logger.log(2, 'RTD');\n this.setMode('MODE_TEXT');\n }\n ccEDM() {\n // Erase Displayed Memory\n this.logger.log(2, 'EDM - Erase Displayed Memory');\n this.displayedMemory.reset();\n this.outputDataUpdate(true);\n }\n ccCR() {\n // Carriage Return\n this.logger.log(2, 'CR - Carriage Return');\n this.writeScreen.rollUp();\n this.outputDataUpdate(true);\n }\n ccENM() {\n // Erase Non-Displayed Memory\n this.logger.log(2, 'ENM - Erase Non-displayed Memory');\n this.nonDisplayedMemory.reset();\n }\n ccEOC() {\n // End of Caption (Flip Memories)\n this.logger.log(2, 'EOC - End Of Caption');\n if (this.mode === 'MODE_POP-ON') {\n const tmp = this.displayedMemory;\n this.displayedMemory = this.nonDisplayedMemory;\n this.nonDisplayedMemory = tmp;\n this.writeScreen = this.nonDisplayedMemory;\n this.logger.log(1, () => 'DISP: ' + this.displayedMemory.getDisplayText());\n }\n this.outputDataUpdate(true);\n }\n ccTO(nrCols) {\n // Tab Offset 1,2, or 3 columns\n this.logger.log(2, 'TO(' + nrCols + ') - Tab Offset');\n this.writeScreen.moveCursor(nrCols);\n }\n ccMIDROW(secondByte) {\n // Parse MIDROW command\n const styles = {\n flash: false\n };\n styles.underline = secondByte % 2 === 1;\n styles.italics = secondByte >= 0x2e;\n if (!styles.italics) {\n const colorIndex = Math.floor(secondByte / 2) - 0x10;\n const colors = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta'];\n styles.foreground = colors[colorIndex];\n } else {\n styles.foreground = 'white';\n }\n this.logger.log(2, 'MIDROW: ' + JSON.stringify(styles));\n this.writeScreen.setPen(styles);\n }\n outputDataUpdate(dispatch = false) {\n const time = this.logger.time;\n if (time === null) {\n return;\n }\n if (this.outputFilter) {\n if (this.cueStartTime === null && !this.displayedMemory.isEmpty()) {\n // Start of a new cue\n this.cueStartTime = time;\n } else {\n if (!this.displayedMemory.equals(this.lastOutputScreen)) {\n this.outputFilter.newCue(this.cueStartTime, time, this.lastOutputScreen);\n if (dispatch && this.outputFilter.dispatchCue) {\n this.outputFilter.dispatchCue();\n }\n this.cueStartTime = this.displayedMemory.isEmpty() ? null : time;\n }\n }\n this.lastOutputScreen.copy(this.displayedMemory);\n }\n }\n cueSplitAtTime(t) {\n if (this.outputFilter) {\n if (!this.displayedMemory.isEmpty()) {\n if (this.outputFilter.newCue) {\n this.outputFilter.newCue(this.cueStartTime, t, this.displayedMemory);\n }\n this.cueStartTime = t;\n }\n }\n }\n}\n\n// Will be 1 or 2 when parsing captions\n\nclass Cea608Parser {\n constructor(field, out1, out2) {\n this.channels = void 0;\n this.currentChannel = 0;\n this.cmdHistory = createCmdHistory();\n this.logger = void 0;\n const logger = this.logger = new CaptionsLogger();\n this.channels = [null, new Cea608Channel(field, out1, logger), new Cea608Channel(field + 1, out2, logger)];\n }\n getHandler(channel) {\n return this.channels[channel].getHandler();\n }\n setHandler(channel, newHandler) {\n this.channels[channel].setHandler(newHandler);\n }\n\n /**\n * Add data for time t in forms of list of bytes (unsigned ints). The bytes are treated as pairs.\n */\n addData(time, byteList) {\n this.logger.time = time;\n for (let i = 0; i < byteList.length; i += 2) {\n const a = byteList[i] & 0x7f;\n const b = byteList[i + 1] & 0x7f;\n let cmdFound = false;\n let charsFound = null;\n if (a === 0 && b === 0) {\n continue;\n } else {\n this.logger.log(3, () => '[' + numArrayToHexArray([byteList[i], byteList[i + 1]]) + '] -> (' + numArrayToHexArray([a, b]) + ')');\n }\n const cmdHistory = this.cmdHistory;\n const isControlCode = a >= 0x10 && a <= 0x1f;\n if (isControlCode) {\n // Skip redundant control codes\n if (hasCmdRepeated(a, b, cmdHistory)) {\n setLastCmd(null, null, cmdHistory);\n this.logger.log(3, () => 'Repeated command (' + numArrayToHexArray([a, b]) + ') is dropped');\n continue;\n }\n setLastCmd(a, b, this.cmdHistory);\n cmdFound = this.parseCmd(a, b);\n if (!cmdFound) {\n cmdFound = this.parseMidrow(a, b);\n }\n if (!cmdFound) {\n cmdFound = this.parsePAC(a, b);\n }\n if (!cmdFound) {\n cmdFound = this.parseBackgroundAttributes(a, b);\n }\n } else {\n setLastCmd(null, null, cmdHistory);\n }\n if (!cmdFound) {\n charsFound = this.parseChars(a, b);\n if (charsFound) {\n const currChNr = this.currentChannel;\n if (currChNr && currChNr > 0) {\n const channel = this.channels[currChNr];\n channel.insertChars(charsFound);\n } else {\n this.logger.log(2, 'No channel found yet. TEXT-MODE?');\n }\n }\n }\n if (!cmdFound && !charsFound) {\n this.logger.log(2, () => \"Couldn't parse cleaned data \" + numArrayToHexArray([a, b]) + ' orig: ' + numArrayToHexArray([byteList[i], byteList[i + 1]]));\n }\n }\n }\n\n /**\n * Parse Command.\n * @returns True if a command was found\n */\n parseCmd(a, b) {\n const cond1 = (a === 0x14 || a === 0x1c || a === 0x15 || a === 0x1d) && b >= 0x20 && b <= 0x2f;\n const cond2 = (a === 0x17 || a === 0x1f) && b >= 0x21 && b <= 0x23;\n if (!(cond1 || cond2)) {\n return false;\n }\n const chNr = a === 0x14 || a === 0x15 || a === 0x17 ? 1 : 2;\n const channel = this.channels[chNr];\n if (a === 0x14 || a === 0x15 || a === 0x1c || a === 0x1d) {\n if (b === 0x20) {\n channel.ccRCL();\n } else if (b === 0x21) {\n channel.ccBS();\n } else if (b === 0x22) {\n channel.ccAOF();\n } else if (b === 0x23) {\n channel.ccAON();\n } else if (b === 0x24) {\n channel.ccDER();\n } else if (b === 0x25) {\n channel.ccRU(2);\n } else if (b === 0x26) {\n channel.ccRU(3);\n } else if (b === 0x27) {\n channel.ccRU(4);\n } else if (b === 0x28) {\n channel.ccFON();\n } else if (b === 0x29) {\n channel.ccRDC();\n } else if (b === 0x2a) {\n channel.ccTR();\n } else if (b === 0x2b) {\n channel.ccRTD();\n } else if (b === 0x2c) {\n channel.ccEDM();\n } else if (b === 0x2d) {\n channel.ccCR();\n } else if (b === 0x2e) {\n channel.ccENM();\n } else if (b === 0x2f) {\n channel.ccEOC();\n }\n } else {\n // a == 0x17 || a == 0x1F\n channel.ccTO(b - 0x20);\n }\n this.currentChannel = chNr;\n return true;\n }\n\n /**\n * Parse midrow styling command\n */\n parseMidrow(a, b) {\n let chNr = 0;\n if ((a === 0x11 || a === 0x19) && b >= 0x20 && b <= 0x2f) {\n if (a === 0x11) {\n chNr = 1;\n } else {\n chNr = 2;\n }\n if (chNr !== this.currentChannel) {\n this.logger.log(0, 'Mismatch channel in midrow parsing');\n return false;\n }\n const channel = this.channels[chNr];\n if (!channel) {\n return false;\n }\n channel.ccMIDROW(b);\n this.logger.log(3, () => 'MIDROW (' + numArrayToHexArray([a, b]) + ')');\n return true;\n }\n return false;\n }\n\n /**\n * Parse Preable Access Codes (Table 53).\n * @returns {Boolean} Tells if PAC found\n */\n parsePAC(a, b) {\n let row;\n const case1 = (a >= 0x11 && a <= 0x17 || a >= 0x19 && a <= 0x1f) && b >= 0x40 && b <= 0x7f;\n const case2 = (a === 0x10 || a === 0x18) && b >= 0x40 && b <= 0x5f;\n if (!(case1 || case2)) {\n return false;\n }\n const chNr = a <= 0x17 ? 1 : 2;\n if (b >= 0x40 && b <= 0x5f) {\n row = chNr === 1 ? rowsLowCh1[a] : rowsLowCh2[a];\n } else {\n // 0x60 <= b <= 0x7F\n row = chNr === 1 ? rowsHighCh1[a] : rowsHighCh2[a];\n }\n const channel = this.channels[chNr];\n if (!channel) {\n return false;\n }\n channel.setPAC(this.interpretPAC(row, b));\n this.currentChannel = chNr;\n return true;\n }\n\n /**\n * Interpret the second byte of the pac, and return the information.\n * @returns pacData with style parameters\n */\n interpretPAC(row, byte) {\n let pacIndex;\n const pacData = {\n color: null,\n italics: false,\n indent: null,\n underline: false,\n row: row\n };\n if (byte > 0x5f) {\n pacIndex = byte - 0x60;\n } else {\n pacIndex = byte - 0x40;\n }\n pacData.underline = (pacIndex & 1) === 1;\n if (pacIndex <= 0xd) {\n pacData.color = ['white', 'green', 'blue', 'cyan', 'red', 'yellow', 'magenta', 'white'][Math.floor(pacIndex / 2)];\n } else if (pacIndex <= 0xf) {\n pacData.italics = true;\n pacData.color = 'white';\n } else {\n pacData.indent = Math.floor((pacIndex - 0x10) / 2) * 4;\n }\n return pacData; // Note that row has zero offset. The spec uses 1.\n }\n\n /**\n * Parse characters.\n * @returns An array with 1 to 2 codes corresponding to chars, if found. null otherwise.\n */\n parseChars(a, b) {\n let channelNr;\n let charCodes = null;\n let charCode1 = null;\n if (a >= 0x19) {\n channelNr = 2;\n charCode1 = a - 8;\n } else {\n channelNr = 1;\n charCode1 = a;\n }\n if (charCode1 >= 0x11 && charCode1 <= 0x13) {\n // Special character\n let oneCode;\n if (charCode1 === 0x11) {\n oneCode = b + 0x50;\n } else if (charCode1 === 0x12) {\n oneCode = b + 0x70;\n } else {\n oneCode = b + 0x90;\n }\n this.logger.log(2, () => \"Special char '\" + getCharForByte(oneCode) + \"' in channel \" + channelNr);\n charCodes = [oneCode];\n } else if (a >= 0x20 && a <= 0x7f) {\n charCodes = b === 0 ? [a] : [a, b];\n }\n if (charCodes) {\n this.logger.log(3, () => 'Char codes = ' + numArrayToHexArray(charCodes).join(','));\n }\n return charCodes;\n }\n\n /**\n * Parse extended background attributes as well as new foreground color black.\n * @returns True if background attributes are found\n */\n parseBackgroundAttributes(a, b) {\n const case1 = (a === 0x10 || a === 0x18) && b >= 0x20 && b <= 0x2f;\n const case2 = (a === 0x17 || a === 0x1f) && b >= 0x2d && b <= 0x2f;\n if (!(case1 || case2)) {\n return false;\n }\n let index;\n const bkgData = {};\n if (a === 0x10 || a === 0x18) {\n index = Math.floor((b - 0x20) / 2);\n bkgData.background = backgroundColors[index];\n if (b % 2 === 1) {\n bkgData.background = bkgData.background + '_semi';\n }\n } else if (b === 0x2d) {\n bkgData.background = 'transparent';\n } else {\n bkgData.foreground = 'black';\n if (b === 0x2f) {\n bkgData.underline = true;\n }\n }\n const chNr = a <= 0x17 ? 1 : 2;\n const channel = this.channels[chNr];\n channel.setBkgData(bkgData);\n return true;\n }\n\n /**\n * Reset state of parser and its channels.\n */\n reset() {\n for (let i = 0; i < Object.keys(this.channels).length; i++) {\n const channel = this.channels[i];\n if (channel) {\n channel.reset();\n }\n }\n setLastCmd(null, null, this.cmdHistory);\n }\n\n /**\n * Trigger the generation of a cue, and the start of a new one if displayScreens are not empty.\n */\n cueSplitAtTime(t) {\n for (let i = 0; i < this.channels.length; i++) {\n const channel = this.channels[i];\n if (channel) {\n channel.cueSplitAtTime(t);\n }\n }\n }\n}\nfunction setLastCmd(a, b, cmdHistory) {\n cmdHistory.a = a;\n cmdHistory.b = b;\n}\nfunction hasCmdRepeated(a, b, cmdHistory) {\n return cmdHistory.a === a && cmdHistory.b === b;\n}\nfunction createCmdHistory() {\n return {\n a: null,\n b: null\n };\n}\n\nclass OutputFilter {\n constructor(timelineController, trackName) {\n this.timelineController = void 0;\n this.cueRanges = [];\n this.trackName = void 0;\n this.startTime = null;\n this.endTime = null;\n this.screen = null;\n this.timelineController = timelineController;\n this.trackName = trackName;\n }\n dispatchCue() {\n if (this.startTime === null) {\n return;\n }\n this.timelineController.addCues(this.trackName, this.startTime, this.endTime, this.screen, this.cueRanges);\n this.startTime = null;\n }\n newCue(startTime, endTime, screen) {\n if (this.startTime === null || this.startTime > startTime) {\n this.startTime = startTime;\n }\n this.endTime = endTime;\n this.screen = screen;\n this.timelineController.createCaptionsTrack(this.trackName);\n }\n reset() {\n this.cueRanges = [];\n this.startTime = null;\n }\n}\n\n/**\n * Copyright 2013 vtt.js Contributors\n *\n * Licensed under the Apache License, Version 2.0 (the 'License');\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n * http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an 'AS IS' BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nvar VTTCue = (function () {\n if (optionalSelf != null && optionalSelf.VTTCue) {\n return self.VTTCue;\n }\n const AllowedDirections = ['', 'lr', 'rl'];\n const AllowedAlignments = ['start', 'middle', 'end', 'left', 'right'];\n function isAllowedValue(allowed, value) {\n if (typeof value !== 'string') {\n return false;\n }\n // necessary for assuring the generic conforms to the Array interface\n if (!Array.isArray(allowed)) {\n return false;\n }\n // reset the type so that the next narrowing works well\n const lcValue = value.toLowerCase();\n // use the allow list to narrow the type to a specific subset of strings\n if (~allowed.indexOf(lcValue)) {\n return lcValue;\n }\n return false;\n }\n function findDirectionSetting(value) {\n return isAllowedValue(AllowedDirections, value);\n }\n function findAlignSetting(value) {\n return isAllowedValue(AllowedAlignments, value);\n }\n function extend(obj, ...rest) {\n let i = 1;\n for (; i < arguments.length; i++) {\n const cobj = arguments[i];\n for (const p in cobj) {\n obj[p] = cobj[p];\n }\n }\n return obj;\n }\n function VTTCue(startTime, endTime, text) {\n const cue = this;\n const baseObj = {\n enumerable: true\n };\n /**\n * Shim implementation specific properties. These properties are not in\n * the spec.\n */\n\n // Lets us know when the VTTCue's data has changed in such a way that we need\n // to recompute its display state. This lets us compute its display state\n // lazily.\n cue.hasBeenReset = false;\n\n /**\n * VTTCue and TextTrackCue properties\n * http://dev.w3.org/html5/webvtt/#vttcue-interface\n */\n\n let _id = '';\n let _pauseOnExit = false;\n let _startTime = startTime;\n let _endTime = endTime;\n let _text = text;\n let _region = null;\n let _vertical = '';\n let _snapToLines = true;\n let _line = 'auto';\n let _lineAlign = 'start';\n let _position = 50;\n let _positionAlign = 'middle';\n let _size = 50;\n let _align = 'middle';\n Object.defineProperty(cue, 'id', extend({}, baseObj, {\n get: function () {\n return _id;\n },\n set: function (value) {\n _id = '' + value;\n }\n }));\n Object.defineProperty(cue, 'pauseOnExit', extend({}, baseObj, {\n get: function () {\n return _pauseOnExit;\n },\n set: function (value) {\n _pauseOnExit = !!value;\n }\n }));\n Object.defineProperty(cue, 'startTime', extend({}, baseObj, {\n get: function () {\n return _startTime;\n },\n set: function (value) {\n if (typeof value !== 'number') {\n throw new TypeError('Start time must be set to a number.');\n }\n _startTime = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'endTime', extend({}, baseObj, {\n get: function () {\n return _endTime;\n },\n set: function (value) {\n if (typeof value !== 'number') {\n throw new TypeError('End time must be set to a number.');\n }\n _endTime = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'text', extend({}, baseObj, {\n get: function () {\n return _text;\n },\n set: function (value) {\n _text = '' + value;\n this.hasBeenReset = true;\n }\n }));\n\n // todo: implement VTTRegion polyfill?\n Object.defineProperty(cue, 'region', extend({}, baseObj, {\n get: function () {\n return _region;\n },\n set: function (value) {\n _region = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'vertical', extend({}, baseObj, {\n get: function () {\n return _vertical;\n },\n set: function (value) {\n const setting = findDirectionSetting(value);\n // Have to check for false because the setting an be an empty string.\n if (setting === false) {\n throw new SyntaxError('An invalid or illegal string was specified.');\n }\n _vertical = setting;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'snapToLines', extend({}, baseObj, {\n get: function () {\n return _snapToLines;\n },\n set: function (value) {\n _snapToLines = !!value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'line', extend({}, baseObj, {\n get: function () {\n return _line;\n },\n set: function (value) {\n if (typeof value !== 'number' && value !== 'auto') {\n throw new SyntaxError('An invalid number or illegal string was specified.');\n }\n _line = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'lineAlign', extend({}, baseObj, {\n get: function () {\n return _lineAlign;\n },\n set: function (value) {\n const setting = findAlignSetting(value);\n if (!setting) {\n throw new SyntaxError('An invalid or illegal string was specified.');\n }\n _lineAlign = setting;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'position', extend({}, baseObj, {\n get: function () {\n return _position;\n },\n set: function (value) {\n if (value < 0 || value > 100) {\n throw new Error('Position must be between 0 and 100.');\n }\n _position = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'positionAlign', extend({}, baseObj, {\n get: function () {\n return _positionAlign;\n },\n set: function (value) {\n const setting = findAlignSetting(value);\n if (!setting) {\n throw new SyntaxError('An invalid or illegal string was specified.');\n }\n _positionAlign = setting;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'size', extend({}, baseObj, {\n get: function () {\n return _size;\n },\n set: function (value) {\n if (value < 0 || value > 100) {\n throw new Error('Size must be between 0 and 100.');\n }\n _size = value;\n this.hasBeenReset = true;\n }\n }));\n Object.defineProperty(cue, 'align', extend({}, baseObj, {\n get: function () {\n return _align;\n },\n set: function (value) {\n const setting = findAlignSetting(value);\n if (!setting) {\n throw new SyntaxError('An invalid or illegal string was specified.');\n }\n _align = setting;\n this.hasBeenReset = true;\n }\n }));\n\n /**\n * Other