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{"version":3,"file":"hls.worker.js.map","sources":["src/events.ts","src/errors.ts","src/crypt/aes-crypto.ts","src/crypt/fast-aes-key.ts","src/utils/typed-array.ts","src/crypt/aes-decryptor.ts","src/utils/logger.ts","src/polyfills/number.ts","node_modules/url-toolkit/src/url-toolkit.js","src/loader/fragment.ts","src/demux/id3.ts","src/utils/hex.ts","src/utils/mp4-tools.ts","src/crypt/decrypter.ts","src/types/demuxer.ts","src/demux/dummy-demuxed-track.ts","src/demux/base-audio-demuxer.ts","src/demux/adts.ts","src/demux/aacdemuxer.ts","src/demux/mp4demuxer.ts","src/demux/mpegaudio.ts","src/demux/exp-golomb.ts","src/demux/sample-aes.ts","src/demux/tsdemuxer.ts","src/demux/mp3demuxer.ts","src/remux/aac-helper.ts","src/remux/mp4-generator.ts","src/types/loader.ts","src/utils/timescale-conversion.ts","src/remux/mp4-remuxer.ts","src/demux/transmuxer.ts","src/remux/passthrough-remuxer.ts","node_modules/eventemitter3/index.js","src/demux/transmuxer-worker.ts"],"sourcesContent":["import {\n ManifestLoadedData,\n ManifestLoadingData,\n MediaAttachedData,\n MediaAttachingData,\n LevelLoadingData,\n LevelLoadedData,\n ManifestParsedData,\n LevelUpdatedData,\n LevelsUpdatedData,\n FragParsingUserdataData,\n FragDecryptedData,\n FragLoadedData,\n InitPTSFoundData,\n CuesParsedData,\n SubtitleFragProcessedData,\n NonNativeTextTracksData,\n FragLoadingData,\n AudioTrackLoadedData,\n SubtitleTrackLoadedData,\n ErrorData,\n AudioTrackSwitchingData,\n AudioTrackSwitchedData,\n KeyLoadedData,\n KeyLoadingData,\n SubtitleTrackSwitchData,\n SubtitleTracksUpdatedData,\n LevelSwitchedData,\n FragChangedData,\n BufferAppendingData,\n BufferCodecsData,\n FragParsingMetadataData,\n FragParsingInitSegmentData,\n FragBufferedData,\n BufferFlushingData,\n BufferEOSData,\n LevelSwitchingData,\n FPSDropLevelCappingData,\n FPSDropData,\n BufferCreatedData,\n BufferAppendedData,\n LevelPTSUpdatedData,\n FragParsedData,\n AudioTracksUpdatedData,\n FragLoadEmergencyAbortedData,\n BackBufferData,\n LiveBackBufferData,\n TrackLoadingData,\n BufferFlushedData,\n} from './types/events';\n\nexport enum Events {\n // Fired before MediaSource is attaching to media element\n MEDIA_ATTACHING = 'hlsMediaAttaching',\n // Fired when MediaSource has been successfully attached to media element\n MEDIA_ATTACHED = 'hlsMediaAttached',\n // Fired before detaching MediaSource from media element\n MEDIA_DETACHING = 'hlsMediaDetaching',\n // Fired when MediaSource has been detached from media element\n MEDIA_DETACHED = 'hlsMediaDetached',\n // Fired when the buffer is going to be reset\n BUFFER_RESET = 'hlsBufferReset',\n // Fired when we know about the codecs that we need buffers for to push into - data: {tracks : { container, codec, levelCodec, initSegment, metadata }}\n BUFFER_CODECS = 'hlsBufferCodecs',\n // fired when sourcebuffers have been created - data: { tracks : tracks }\n BUFFER_CREATED = 'hlsBufferCreated',\n // fired when we append a segment to the buffer - data: { segment: segment object }\n BUFFER_APPENDING = 'hlsBufferAppending',\n // fired when we are done with appending a media segment to the buffer - data : { parent : segment parent that triggered BUFFER_APPENDING, pending : nb of segments waiting for appending for this segment parent}\n BUFFER_APPENDED = 'hlsBufferAppended',\n // fired when the stream is finished and we want to notify the media buffer that there will be no more data - data: { }\n BUFFER_EOS = 'hlsBufferEos',\n // fired when the media buffer should be flushed - data { startOffset, endOffset }\n BUFFER_FLUSHING = 'hlsBufferFlushing',\n // fired when the media buffer has been flushed - data: { }\n BUFFER_FLUSHED = 'hlsBufferFlushed',\n // fired to signal that a manifest loading starts - data: { url : manifestURL}\n MANIFEST_LOADING = 'hlsManifestLoading',\n // fired after manifest has been loaded - data: { levels : [available quality levels], audioTracks : [ available audio tracks ], url : manifestURL, stats : LoaderStats }\n MANIFEST_LOADED = 'hlsManifestLoaded',\n // fired after manifest has been parsed - data: { levels : [available quality levels], firstLevel : index of first quality level appearing in Manifest}\n MANIFEST_PARSED = 'hlsManifestParsed',\n // fired when a level switch is requested - data: { level : id of new level }\n LEVEL_SWITCHING = 'hlsLevelSwitching',\n // fired when a level switch is effective - data: { level : id of new level }\n LEVEL_SWITCHED = 'hlsLevelSwitched',\n // fired when a level playlist loading starts - data: { url : level URL, level : id of level being loaded}\n LEVEL_LOADING = 'hlsLevelLoading',\n // fired when a level playlist loading finishes - data: { details : levelDetails object, level : id of loaded level, stats : LoaderStats }\n LEVEL_LOADED = 'hlsLevelLoaded',\n // fired when a level's details have been updated based on previous details, after it has been loaded - data: { details : levelDetails object, level : id of updated level }\n LEVEL_UPDATED = 'hlsLevelUpdated',\n // fired when a level's PTS information has been updated after parsing a fragment - data: { details : levelDetails object, level : id of updated level, drift: PTS drift observed when parsing last fragment }\n LEVEL_PTS_UPDATED = 'hlsLevelPtsUpdated',\n // fired to notify that levels have changed after removing a level - data: { levels : [available quality levels] }\n LEVELS_UPDATED = 'hlsLevelsUpdated',\n // fired to notify that audio track lists has been updated - data: { audioTracks : audioTracks }\n AUDIO_TRACKS_UPDATED = 'hlsAudioTracksUpdated',\n // fired when an audio track switching is requested - data: { id : audio track id }\n AUDIO_TRACK_SWITCHING = 'hlsAudioTrackSwitching',\n // fired when an audio track switch actually occurs - data: { id : audio track id }\n AUDIO_TRACK_SWITCHED = 'hlsAudioTrackSwitched',\n // fired when an audio track loading starts - data: { url : audio track URL, id : audio track id }\n AUDIO_TRACK_LOADING = 'hlsAudioTrackLoading',\n // fired when an audio track loading finishes - data: { details : levelDetails object, id : audio track id, stats : LoaderStats }\n AUDIO_TRACK_LOADED = 'hlsAudioTrackLoaded',\n // fired to notify that subtitle track lists has been updated - data: { subtitleTracks : subtitleTracks }\n SUBTITLE_TRACKS_UPDATED = 'hlsSubtitleTracksUpdated',\n // fired to notify that subtitle tracks were cleared as a result of stopping the media\n SUBTITLE_TRACKS_CLEARED = 'hlsSubtitleTracksCleared',\n // fired when an subtitle track switch occurs - data: { id : subtitle track id }\n SUBTITLE_TRACK_SWITCH = 'hlsSubtitleTrackSwitch',\n // fired when a subtitle track loading starts - data: { url : subtitle track URL, id : subtitle track id }\n SUBTITLE_TRACK_LOADING = 'hlsSubtitleTrackLoading',\n // fired when a subtitle track loading finishes - data: { details : levelDetails object, id : subtitle track id, stats : LoaderStats }\n SUBTITLE_TRACK_LOADED = 'hlsSubtitleTrackLoaded',\n // fired when a subtitle fragment has been processed - data: { success : boolean, frag : the processed frag }\n SUBTITLE_FRAG_PROCESSED = 'hlsSubtitleFragProcessed',\n // fired when a set of VTTCues to be managed externally has been parsed - data: { type: string, track: string, cues: [ VTTCue ] }\n CUES_PARSED = 'hlsCuesParsed',\n // fired when a text track to be managed externally is found - data: { tracks: [ { label: string, kind: string, default: boolean } ] }\n NON_NATIVE_TEXT_TRACKS_FOUND = 'hlsNonNativeTextTracksFound',\n // fired when the first timestamp is found - data: { id : demuxer id, initPTS: initPTS, timescale: timescale, frag : fragment object }\n INIT_PTS_FOUND = 'hlsInitPtsFound',\n // fired when a fragment loading starts - data: { frag : fragment object }\n FRAG_LOADING = 'hlsFragLoading',\n // fired when a fragment loading is progressing - data: { frag : fragment object, { trequest, tfirst, loaded } }\n // FRAG_LOAD_PROGRESS = 'hlsFragLoadProgress',\n // Identifier for fragment load aborting for emergency switch down - data: { frag : fragment object }\n FRAG_LOAD_EMERGENCY_ABORTED = 'hlsFragLoadEmergencyAborted',\n // fired when a fragment loading is completed - data: { frag : fragment object, payload : fragment payload, stats : LoaderStats }\n FRAG_LOADED = 'hlsFragLoaded',\n // fired when a fragment has finished decrypting - data: { id : demuxer id, frag: fragment object, payload : fragment payload, stats : { tstart, tdecrypt } }\n FRAG_DECRYPTED = 'hlsFragDecrypted',\n // fired when Init Segment has been extracted from fragment - data: { id : demuxer id, frag: fragment object, moov : moov MP4 box, codecs : codecs found while parsing fragment }\n FRAG_PARSING_INIT_SEGMENT = 'hlsFragParsingInitSegment',\n // fired when parsing sei text is completed - data: { id : demuxer id, frag: fragment object, samples : [ sei samples pes ] }\n FRAG_PARSING_USERDATA = 'hlsFragParsingUserdata',\n // fired when parsing id3 is completed - data: { id : demuxer id, frag: fragment object, samples : [ id3 samples pes ] }\n FRAG_PARSING_METADATA = 'hlsFragParsingMetadata',\n // fired when data have been extracted from fragment - data: { id : demuxer id, frag: fragment object, data1 : moof MP4 box or TS fragments, data2 : mdat MP4 box or null}\n // FRAG_PARSING_DATA = 'hlsFragParsingData',\n // fired when fragment parsing is completed - data: { id : demuxer id, frag: fragment object }\n FRAG_PARSED = 'hlsFragParsed',\n // fired when fragment remuxed MP4 boxes have all been appended into SourceBuffer - data: { id : demuxer id, frag : fragment object, stats : LoaderStats }\n FRAG_BUFFERED = 'hlsFragBuffered',\n // fired when fragment matching with current media position is changing - data : { id : demuxer id, frag : fragment object }\n FRAG_CHANGED = 'hlsFragChanged',\n // Identifier for a FPS drop event - data: { currentDropped, currentDecoded, totalDroppedFrames }\n FPS_DROP = 'hlsFpsDrop',\n // triggered when FPS drop triggers auto level capping - data: { level, droppedLevel }\n FPS_DROP_LEVEL_CAPPING = 'hlsFpsDropLevelCapping',\n // Identifier for an error event - data: { type : error type, details : error details, fatal : if true, hls.js cannot/will not try to recover, if false, hls.js will try to recover,other error specific data }\n ERROR = 'hlsError',\n // fired when hls.js instance starts destroying. Different from MEDIA_DETACHED as one could want to detach and reattach a media to the instance of hls.js to handle mid-rolls for example - data: { }\n DESTROYING = 'hlsDestroying',\n // fired when a decrypt key loading starts - data: { frag : fragment object }\n KEY_LOADING = 'hlsKeyLoading',\n // fired when a decrypt key loading is completed - data: { frag : fragment object, keyInfo : KeyLoaderInfo }\n KEY_LOADED = 'hlsKeyLoaded',\n // deprecated; please use BACK_BUFFER_REACHED - data : { bufferEnd: number }\n LIVE_BACK_BUFFER_REACHED = 'hlsLiveBackBufferReached',\n // fired when the back buffer is reached as defined by the backBufferLength config option - data : { bufferEnd: number }\n BACK_BUFFER_REACHED = 'hlsBackBufferReached',\n}\n\n/**\n * Defines each Event type and payload by Event name. Used in {@link hls.js#HlsEventEmitter} to strongly type the event listener API.\n */\nexport interface HlsListeners {\n [Events.MEDIA_ATTACHING]: (\n event: Events.MEDIA_ATTACHING,\n data: MediaAttachingData\n ) => void;\n [Events.MEDIA_ATTACHED]: (\n event: Events.MEDIA_ATTACHED,\n data: MediaAttachedData\n ) => void;\n [Events.MEDIA_DETACHING]: (event: Events.MEDIA_DETACHING) => void;\n [Events.MEDIA_DETACHED]: (event: Events.MEDIA_DETACHED) => void;\n [Events.BUFFER_RESET]: (event: Events.BUFFER_RESET) => void;\n [Events.BUFFER_CODECS]: (\n event: Events.BUFFER_CODECS,\n data: BufferCodecsData\n ) => void;\n [Events.BUFFER_CREATED]: (\n event: Events.BUFFER_CREATED,\n data: BufferCreatedData\n ) => void;\n [Events.BUFFER_APPENDING]: (\n event: Events.BUFFER_APPENDING,\n data: BufferAppendingData\n ) => void;\n [Events.BUFFER_APPENDED]: (\n event: Events.BUFFER_APPENDED,\n data: BufferAppendedData\n ) => void;\n [Events.BUFFER_EOS]: (event: Events.BUFFER_EOS, data: BufferEOSData) => void;\n [Events.BUFFER_FLUSHING]: (\n event: Events.BUFFER_FLUSHING,\n data: BufferFlushingData\n ) => void;\n [Events.BUFFER_FLUSHED]: (\n event: Events.BUFFER_FLUSHED,\n data: BufferFlushedData\n ) => void;\n [Events.MANIFEST_LOADING]: (\n event: Events.MANIFEST_LOADING,\n data: ManifestLoadingData\n ) => void;\n [Events.MANIFEST_LOADED]: (\n event: Events.MANIFEST_LOADED,\n data: ManifestLoadedData\n ) => void;\n [Events.MANIFEST_PARSED]: (\n event: Events.MANIFEST_PARSED,\n data: ManifestParsedData\n ) => void;\n [Events.LEVEL_SWITCHING]: (\n event: Events.LEVEL_SWITCHING,\n data: LevelSwitchingData\n ) => void;\n [Events.LEVEL_SWITCHED]: (\n event: Events.LEVEL_SWITCHED,\n data: LevelSwitchedData\n ) => void;\n [Events.LEVEL_LOADING]: (\n event: Events.LEVEL_LOADING,\n data: LevelLoadingData\n ) => void;\n [Events.LEVEL_LOADED]: (\n event: Events.LEVEL_LOADED,\n data: LevelLoadedData\n ) => void;\n [Events.LEVEL_UPDATED]: (\n event: Events.LEVEL_UPDATED,\n data: LevelUpdatedData\n ) => void;\n [Events.LEVEL_PTS_UPDATED]: (\n event: Events.LEVEL_PTS_UPDATED,\n data: LevelPTSUpdatedData\n ) => void;\n [Events.LEVELS_UPDATED]: (\n event: Events.LEVELS_UPDATED,\n data: LevelsUpdatedData\n ) => void;\n [Events.AUDIO_TRACKS_UPDATED]: (\n event: Events.AUDIO_TRACKS_UPDATED,\n data: AudioTracksUpdatedData\n ) => void;\n [Events.AUDIO_TRACK_SWITCHING]: (\n event: Events.AUDIO_TRACK_SWITCHING,\n data: AudioTrackSwitchingData\n ) => void;\n [Events.AUDIO_TRACK_SWITCHED]: (\n event: Events.AUDIO_TRACK_SWITCHED,\n data: AudioTrackSwitchedData\n ) => void;\n [Events.AUDIO_TRACK_LOADING]: (\n event: Events.AUDIO_TRACK_LOADING,\n data: TrackLoadingData\n ) => void;\n [Events.AUDIO_TRACK_LOADED]: (\n event: Events.AUDIO_TRACK_LOADED,\n data: AudioTrackLoadedData\n ) => void;\n [Events.SUBTITLE_TRACKS_UPDATED]: (\n event: Events.SUBTITLE_TRACKS_UPDATED,\n data: SubtitleTracksUpdatedData\n ) => void;\n [Events.SUBTITLE_TRACKS_CLEARED]: (\n event: Events.SUBTITLE_TRACKS_CLEARED\n ) => void;\n [Events.SUBTITLE_TRACK_SWITCH]: (\n event: Events.SUBTITLE_TRACK_SWITCH,\n data: SubtitleTrackSwitchData\n ) => void;\n [Events.SUBTITLE_TRACK_LOADING]: (\n event: Events.SUBTITLE_TRACK_LOADING,\n data: TrackLoadingData\n ) => void;\n [Events.SUBTITLE_TRACK_LOADED]: (\n event: Events.SUBTITLE_TRACK_LOADED,\n data: SubtitleTrackLoadedData\n ) => void;\n [Events.SUBTITLE_FRAG_PROCESSED]: (\n event: Events.SUBTITLE_FRAG_PROCESSED,\n data: SubtitleFragProcessedData\n ) => void;\n [Events.CUES_PARSED]: (\n event: Events.CUES_PARSED,\n data: CuesParsedData\n ) => void;\n [Events.NON_NATIVE_TEXT_TRACKS_FOUND]: (\n event: Events.NON_NATIVE_TEXT_TRACKS_FOUND,\n data: NonNativeTextTracksData\n ) => void;\n [Events.INIT_PTS_FOUND]: (\n event: Events.INIT_PTS_FOUND,\n data: InitPTSFoundData\n ) => void;\n [Events.FRAG_LOADING]: (\n event: Events.FRAG_LOADING,\n data: FragLoadingData\n ) => void;\n // [Events.FRAG_LOAD_PROGRESS]: TodoEventType\n [Events.FRAG_LOAD_EMERGENCY_ABORTED]: (\n event: Events.FRAG_LOAD_EMERGENCY_ABORTED,\n data: FragLoadEmergencyAbortedData\n ) => void;\n [Events.FRAG_LOADED]: (\n event: Events.FRAG_LOADED,\n data: FragLoadedData\n ) => void;\n [Events.FRAG_DECRYPTED]: (\n event: Events.FRAG_DECRYPTED,\n data: FragDecryptedData\n ) => void;\n [Events.FRAG_PARSING_INIT_SEGMENT]: (\n event: Events.FRAG_PARSING_INIT_SEGMENT,\n data: FragParsingInitSegmentData\n ) => void;\n [Events.FRAG_PARSING_USERDATA]: (\n event: Events.FRAG_PARSING_USERDATA,\n data: FragParsingUserdataData\n ) => void;\n [Events.FRAG_PARSING_METADATA]: (\n event: Events.FRAG_PARSING_METADATA,\n data: FragParsingMetadataData\n ) => void;\n // [Events.FRAG_PARSING_DATA]: TodoEventType\n [Events.FRAG_PARSED]: (\n event: Events.FRAG_PARSED,\n data: FragParsedData\n ) => void;\n [Events.FRAG_BUFFERED]: (\n event: Events.FRAG_BUFFERED,\n data: FragBufferedData\n ) => void;\n [Events.FRAG_CHANGED]: (\n event: Events.FRAG_CHANGED,\n data: FragChangedData\n ) => void;\n [Events.FPS_DROP]: (event: Events.FPS_DROP, data: FPSDropData) => void;\n [Events.FPS_DROP_LEVEL_CAPPING]: (\n event: Events.FPS_DROP_LEVEL_CAPPING,\n data: FPSDropLevelCappingData\n ) => void;\n [Events.ERROR]: (event: Events.ERROR, data: ErrorData) => void;\n [Events.DESTROYING]: (event: Events.DESTROYING) => void;\n [Events.KEY_LOADING]: (\n event: Events.KEY_LOADING,\n data: KeyLoadingData\n ) => void;\n [Events.KEY_LOADED]: (event: Events.KEY_LOADED, data: KeyLoadedData) => void;\n [Events.LIVE_BACK_BUFFER_REACHED]: (\n event: Events.LIVE_BACK_BUFFER_REACHED,\n data: LiveBackBufferData\n ) => void;\n [Events.BACK_BUFFER_REACHED]: (\n event: Events.BACK_BUFFER_REACHED,\n data: BackBufferData\n ) => void;\n}\nexport interface HlsEventEmitter {\n on<E extends keyof HlsListeners, Context = undefined>(\n event: E,\n listener: HlsListeners[E],\n context?: Context\n ): void;\n once<E extends keyof HlsListeners, Context = undefined>(\n event: E,\n listener: HlsListeners[E],\n context?: Context\n ): void;\n\n removeAllListeners<E extends keyof HlsListeners>(event?: E): void;\n off<E extends keyof HlsListeners, Context = undefined>(\n event: E,\n listener?: HlsListeners[E],\n context?: Context,\n once?: boolean\n ): void;\n\n listeners<E extends keyof HlsListeners>(event: E): HlsListeners[E][];\n emit<E extends keyof HlsListeners>(\n event: E,\n name: E,\n eventObject: Parameters<HlsListeners[E]>[1]\n ): boolean;\n listenerCount<E extends keyof HlsListeners>(event: E): number;\n}\n","export enum ErrorTypes {\n // Identifier for a network error (loading error / timeout ...)\n NETWORK_ERROR = 'networkError',\n // Identifier for a media Error (video/parsing/mediasource error)\n MEDIA_ERROR = 'mediaError',\n // EME (encrypted media extensions) errors\n KEY_SYSTEM_ERROR = 'keySystemError',\n // Identifier for a mux Error (demuxing/remuxing)\n MUX_ERROR = 'muxError',\n // Identifier for all other errors\n OTHER_ERROR = 'otherError',\n}\n\nexport enum ErrorDetails {\n KEY_SYSTEM_NO_KEYS = 'keySystemNoKeys',\n KEY_SYSTEM_NO_ACCESS = 'keySystemNoAccess',\n KEY_SYSTEM_NO_SESSION = 'keySystemNoSession',\n KEY_SYSTEM_NO_CONFIGURED_LICENSE = 'keySystemNoConfiguredLicense',\n KEY_SYSTEM_LICENSE_REQUEST_FAILED = 'keySystemLicenseRequestFailed',\n KEY_SYSTEM_SERVER_CERTIFICATE_REQUEST_FAILED = 'keySystemServerCertificateRequestFailed',\n KEY_SYSTEM_SERVER_CERTIFICATE_UPDATE_FAILED = 'keySystemServerCertificateUpdateFailed',\n KEY_SYSTEM_SESSION_UPDATE_FAILED = 'keySystemSessionUpdateFailed',\n KEY_SYSTEM_STATUS_OUTPUT_RESTRICTED = 'keySystemStatusOutputRestricted',\n KEY_SYSTEM_STATUS_INTERNAL_ERROR = 'keySystemStatusInternalError',\n // Identifier for a manifest load error - data: { url : faulty URL, response : { code: error code, text: error text }}\n MANIFEST_LOAD_ERROR = 'manifestLoadError',\n // Identifier for a manifest load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}\n MANIFEST_LOAD_TIMEOUT = 'manifestLoadTimeOut',\n // Identifier for a manifest parsing error - data: { url : faulty URL, reason : error reason}\n MANIFEST_PARSING_ERROR = 'manifestParsingError',\n // Identifier for a manifest with only incompatible codecs error - data: { url : faulty URL, reason : error reason}\n MANIFEST_INCOMPATIBLE_CODECS_ERROR = 'manifestIncompatibleCodecsError',\n // Identifier for a level which contains no fragments - data: { url: faulty URL, reason: \"no fragments found in level\", level: index of the bad level }\n LEVEL_EMPTY_ERROR = 'levelEmptyError',\n // Identifier for a level load error - data: { url : faulty URL, response : { code: error code, text: error text }}\n LEVEL_LOAD_ERROR = 'levelLoadError',\n // Identifier for a level load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}\n LEVEL_LOAD_TIMEOUT = 'levelLoadTimeOut',\n // Identifier for a level parse error - data: { url : faulty URL, error: Error, reason: error message }\n LEVEL_PARSING_ERROR = 'levelParsingError',\n // Identifier for a level switch error - data: { level : faulty level Id, event : error description}\n LEVEL_SWITCH_ERROR = 'levelSwitchError',\n // Identifier for an audio track load error - data: { url : faulty URL, response : { code: error code, text: error text }}\n AUDIO_TRACK_LOAD_ERROR = 'audioTrackLoadError',\n // Identifier for an audio track load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}\n AUDIO_TRACK_LOAD_TIMEOUT = 'audioTrackLoadTimeOut',\n // Identifier for a subtitle track load error - data: { url : faulty URL, response : { code: error code, text: error text }}\n SUBTITLE_LOAD_ERROR = 'subtitleTrackLoadError',\n // Identifier for a subtitle track load timeout - data: { url : faulty URL, response : { code: error code, text: error text }}\n SUBTITLE_TRACK_LOAD_TIMEOUT = 'subtitleTrackLoadTimeOut',\n // Identifier for fragment load error - data: { frag : fragment object, response : { code: error code, text: error text }}\n FRAG_LOAD_ERROR = 'fragLoadError',\n // Identifier for fragment load timeout error - data: { frag : fragment object}\n FRAG_LOAD_TIMEOUT = 'fragLoadTimeOut',\n // Identifier for a fragment decryption error event - data: {id : demuxer Id,frag: fragment object, reason : parsing error description }\n FRAG_DECRYPT_ERROR = 'fragDecryptError',\n // Identifier for a fragment parsing error event - data: { id : demuxer Id, reason : parsing error description }\n // will be renamed DEMUX_PARSING_ERROR and switched to MUX_ERROR in the next major release\n FRAG_PARSING_ERROR = 'fragParsingError',\n // Identifier for a fragment or part load skipped because of a GAP tag or attribute\n FRAG_GAP = 'fragGap',\n // Identifier for a remux alloc error event - data: { id : demuxer Id, frag : fragment object, bytes : nb of bytes on which allocation failed , reason : error text }\n REMUX_ALLOC_ERROR = 'remuxAllocError',\n // Identifier for decrypt key load error - data: { frag : fragment object, response : { code: error code, text: error text }}\n KEY_LOAD_ERROR = 'keyLoadError',\n // Identifier for decrypt key load timeout error - data: { frag : fragment object}\n KEY_LOAD_TIMEOUT = 'keyLoadTimeOut',\n // Triggered when an exception occurs while adding a sourceBuffer to MediaSource - data : { error : exception , mimeType : mimeType }\n BUFFER_ADD_CODEC_ERROR = 'bufferAddCodecError',\n // Triggered when source buffer(s) could not be created using level (manifest CODECS attribute), parsed media, or best guess codec(s) - data: { reason : error reason }\n BUFFER_INCOMPATIBLE_CODECS_ERROR = 'bufferIncompatibleCodecsError',\n // Identifier for a buffer append error - data: append error description\n BUFFER_APPEND_ERROR = 'bufferAppendError',\n // Identifier for a buffer appending error event - data: appending error description\n BUFFER_APPENDING_ERROR = 'bufferAppendingError',\n // Identifier for a buffer stalled error event\n BUFFER_STALLED_ERROR = 'bufferStalledError',\n // Identifier for a buffer full event\n BUFFER_FULL_ERROR = 'bufferFullError',\n // Identifier for a buffer seek over hole event\n BUFFER_SEEK_OVER_HOLE = 'bufferSeekOverHole',\n // Identifier for a buffer nudge on stall (playback is stuck although currentTime is in a buffered area)\n BUFFER_NUDGE_ON_STALL = 'bufferNudgeOnStall',\n // Identifier for an internal exception happening inside hls.js while handling an event\n INTERNAL_EXCEPTION = 'internalException',\n // Identifier for an internal call to abort a loader\n INTERNAL_ABORTED = 'aborted',\n // Uncategorized error\n UNKNOWN = 'unknown',\n}\n","export default class AESCrypto {\n private subtle: SubtleCrypto;\n private aesIV: Uint8Array;\n\n constructor(subtle: SubtleCrypto, iv: Uint8Array) {\n this.subtle = subtle;\n this.aesIV = iv;\n }\n\n decrypt(data: ArrayBuffer, key: CryptoKey) {\n return this.subtle.decrypt({ name: 'AES-CBC', iv: this.aesIV }, key, data);\n }\n}\n","export default class FastAESKey {\n private subtle: any;\n private key: ArrayBuffer;\n\n constructor(subtle, key) {\n this.subtle = subtle;\n this.key = key;\n }\n\n expandKey() {\n return this.subtle.importKey('raw', this.key, { name: 'AES-CBC' }, false, [\n 'encrypt',\n 'decrypt',\n ]);\n }\n}\n","export function sliceUint8(\n array: Uint8Array,\n start?: number,\n end?: number\n): Uint8Array {\n // @ts-expect-error This polyfills IE11 usage of Uint8Array slice.\n // It always exists in the TypeScript definition so fails, but it fails at runtime on IE11.\n return Uint8Array.prototype.slice\n ? array.slice(start, end)\n : new Uint8Array(Array.prototype.slice.call(array, start, end));\n}\n","import { sliceUint8 } from '../utils/typed-array';\n\n// PKCS7\nexport function removePadding(array: Uint8Array): Uint8Array {\n const outputBytes = array.byteLength;\n const paddingBytes =\n outputBytes && new DataView(array.buffer).getUint8(outputBytes - 1);\n if (paddingBytes) {\n return sliceUint8(array, 0, outputBytes - paddingBytes);\n }\n return array;\n}\n\nexport default class AESDecryptor {\n private rcon: Array<number> = [\n 0x0, 0x1, 0x2, 0x4, 0x8, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36,\n ];\n private subMix: Array<Uint32Array> = [\n new Uint32Array(256),\n new Uint32Array(256),\n new Uint32Array(256),\n new Uint32Array(256),\n ];\n private invSubMix: Array<Uint32Array> = [\n new Uint32Array(256),\n new Uint32Array(256),\n new Uint32Array(256),\n new Uint32Array(256),\n ];\n private sBox: Uint32Array = new Uint32Array(256);\n private invSBox: Uint32Array = new Uint32Array(256);\n private key: Uint32Array = new Uint32Array(0);\n\n private ksRows: number = 0;\n private keySize: number = 0;\n private keySchedule!: Uint32Array;\n private invKeySchedule!: Uint32Array;\n\n constructor() {\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\n return newArray;\n }\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\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\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\n expandKey(keyBuffer: ArrayBuffer) {\n // convert keyBuffer to Uint32Array\n const key = this.uint8ArrayToUint32Array_(keyBuffer);\n let sameKey = true;\n let offset = 0;\n\n while (offset < key.length && sameKey) {\n sameKey = key[offset] === this.key[offset];\n offset++;\n }\n\n if (sameKey) {\n return;\n }\n\n this.key = key;\n const keySize = (this.keySize = key.length);\n\n if (keySize !== 4 && keySize !== 6 && keySize !== 8) {\n throw new Error('Invalid aes key size=' + keySize);\n }\n\n const ksRows = (this.ksRows = (keySize + 6 + 1) * 4);\n let ksRow;\n let invKsRow;\n\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\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\n let prev;\n let t;\n\n for (ksRow = 0; ksRow < ksRows; ksRow++) {\n if (ksRow < keySize) {\n prev = keySchedule[ksRow] = key[ksRow];\n continue;\n }\n t = prev;\n\n if (ksRow % keySize === 0) {\n // Rot word\n t = (t << 8) | (t >>> 24);\n\n // Sub word\n t =\n (sbox[t >>> 24] << 24) |\n (sbox[(t >>> 16) & 0xff] << 16) |\n (sbox[(t >>> 8) & 0xff] << 8) |\n 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 =\n (sbox[t >>> 24] << 24) |\n (sbox[(t >>> 16) & 0xff] << 16) |\n (sbox[(t >>> 8) & 0xff] << 8) |\n sbox[t & 0xff];\n }\n\n keySchedule[ksRow] = prev = (keySchedule[ksRow - keySize] ^ t) >>> 0;\n }\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\n if (invKsRow < 4 || ksRow <= 4) {\n invKeySchedule[invKsRow] = t;\n } else {\n invKeySchedule[invKsRow] =\n invSubMix0[sbox[t >>> 24]] ^\n invSubMix1[sbox[(t >>> 16) & 0xff]] ^\n invSubMix2[sbox[(t >>> 8) & 0xff]] ^\n invSubMix3[sbox[t & 0xff]];\n }\n\n invKeySchedule[invKsRow] = invKeySchedule[invKsRow] >>> 0;\n }\n }\n\n // Adding this as a method greatly improves performance.\n networkToHostOrderSwap(word) {\n return (\n (word << 24) |\n ((word & 0xff00) << 8) |\n ((word & 0xff0000) >> 8) |\n (word >>> 24)\n );\n }\n\n decrypt(inputArrayBuffer: ArrayBuffer, offset: number, aesIV: ArrayBuffer) {\n const nRounds = this.keySize + 6;\n const invKeySchedule = this.invKeySchedule;\n const invSBOX = this.invSBox;\n\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\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\n const inputInt32 = new Int32Array(inputArrayBuffer);\n const outputInt32 = new Int32Array(inputInt32.length);\n\n let t0, t1, t2, t3;\n let s0, s1, s2, s3;\n let inputWords0, inputWords1, inputWords2, inputWords3;\n\n let ksRow, i;\n const swapWord = this.networkToHostOrderSwap;\n\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\n s0 = inputWords0 ^ invKeySchedule[0];\n s1 = inputWords3 ^ invKeySchedule[1];\n s2 = inputWords2 ^ invKeySchedule[2];\n s3 = inputWords1 ^ invKeySchedule[3];\n\n ksRow = 4;\n\n // Iterate through the rounds of decryption\n for (i = 1; i < nRounds; i++) {\n t0 =\n invSubMix0[s0 >>> 24] ^\n invSubMix1[(s1 >> 16) & 0xff] ^\n invSubMix2[(s2 >> 8) & 0xff] ^\n invSubMix3[s3 & 0xff] ^\n invKeySchedule[ksRow];\n t1 =\n invSubMix0[s1 >>> 24] ^\n invSubMix1[(s2 >> 16) & 0xff] ^\n invSubMix2[(s3 >> 8) & 0xff] ^\n invSubMix3[s0 & 0xff] ^\n invKeySchedule[ksRow + 1];\n t2 =\n invSubMix0[s2 >>> 24] ^\n invSubMix1[(s3 >> 16) & 0xff] ^\n invSubMix2[(s0 >> 8) & 0xff] ^\n invSubMix3[s1 & 0xff] ^\n invKeySchedule[ksRow + 2];\n t3 =\n invSubMix0[s3 >>> 24] ^\n invSubMix1[(s0 >> 16) & 0xff] ^\n invSubMix2[(s1 >> 8) & 0xff] ^\n invSubMix3[s2 & 0xff] ^\n invKeySchedule[ksRow + 3];\n // Update state\n s0 = t0;\n s1 = t1;\n s2 = t2;\n s3 = t3;\n\n ksRow = ksRow + 4;\n }\n\n // Shift rows, sub bytes, add round key\n t0 =\n (invSBOX[s0 >>> 24] << 24) ^\n (invSBOX[(s1 >> 16) & 0xff] << 16) ^\n (invSBOX[(s2 >> 8) & 0xff] << 8) ^\n invSBOX[s3 & 0xff] ^\n invKeySchedule[ksRow];\n t1 =\n (invSBOX[s1 >>> 24] << 24) ^\n (invSBOX[(s2 >> 16) & 0xff] << 16) ^\n (invSBOX[(s3 >> 8) & 0xff] << 8) ^\n invSBOX[s0 & 0xff] ^\n invKeySchedule[ksRow + 1];\n t2 =\n (invSBOX[s2 >>> 24] << 24) ^\n (invSBOX[(s3 >> 16) & 0xff] << 16) ^\n (invSBOX[(s0 >> 8) & 0xff] << 8) ^\n invSBOX[s1 & 0xff] ^\n invKeySchedule[ksRow + 2];\n t3 =\n (invSBOX[s3 >>> 24] << 24) ^\n (invSBOX[(s0 >> 16) & 0xff] << 16) ^\n (invSBOX[(s1 >> 8) & 0xff] << 8) ^\n invSBOX[s2 & 0xff] ^\n 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\n offset = offset + 4;\n }\n\n return outputInt32.buffer;\n }\n}\n","export interface ILogFunction {\n (message?: any, ...optionalParams: any[]): void;\n}\n\nexport interface ILogger {\n trace: ILogFunction;\n debug: ILogFunction;\n log: ILogFunction;\n warn: ILogFunction;\n info: ILogFunction;\n error: ILogFunction;\n}\n\nconst noop: ILogFunction = function () {};\n\nconst fakeLogger: ILogger = {\n trace: noop,\n debug: noop,\n log: noop,\n warn: noop,\n info: noop,\n error: noop,\n};\n\nlet exportedLogger: ILogger = fakeLogger;\n\n// let lastCallTime;\n// function formatMsgWithTimeInfo(type, msg) {\n// const now = Date.now();\n// const diff = lastCallTime ? '+' + (now - lastCallTime) : '0';\n// lastCallTime = now;\n// msg = (new Date(now)).toISOString() + ' | [' + type + '] > ' + msg + ' ( ' + diff + ' ms )';\n// return msg;\n// }\n\nfunction consolePrintFn(type: string): ILogFunction {\n const func: ILogFunction = self.console[type];\n if (func) {\n return func.bind(self.console, `[${type}] >`);\n }\n return noop;\n}\n\nfunction exportLoggerFunctions(\n debugConfig: boolean | ILogger,\n ...functions: string[]\n): void {\n functions.forEach(function (type) {\n exportedLogger[type] = debugConfig[type]\n ? debugConfig[type].bind(debugConfig)\n : consolePrintFn(type);\n });\n}\n\nexport function enableLogs(debugConfig: boolean | ILogger, id: string): void {\n // check that console is available\n if (\n (self.console && debugConfig === true) ||\n typeof debugConfig === 'object'\n ) {\n exportLoggerFunctions(\n debugConfig,\n // Remove out from list here to hard-disable a log-level\n // 'trace',\n 'debug',\n 'log',\n 'info',\n 'warn',\n 'error'\n );\n // Some browsers don't allow to use bind on console object anyway\n // fallback to default if needed\n try {\n exportedLogger.log(\n `Debug logs enabled for \"${id}\" in hls.js version ${__VERSION__}`\n );\n } catch (e) {\n exportedLogger = fakeLogger;\n }\n } else {\n exportedLogger = fakeLogger;\n }\n}\n\nexport const logger: ILogger = exportedLogger;\n","export const isFiniteNumber =\n Number.isFinite ||\n function (value) {\n return typeof value === 'number' && isFinite(value);\n };\n\nexport const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER || 9007199254740991;\n","// see https://tools.ietf.org/html/rfc1808\n\n(function (root) {\n var URL_REGEX =\n /^(?=((?:[a-zA-Z0-9+\\-.]+:)?))\\1(?=((?:\\/\\/[^\\/?#]*)?))\\2(?=((?:(?:[^?#\\/]*\\/)*[^;?#\\/]*)?))\\3((?:;[^?#]*)?)(\\?[^#]*)?(#[^]*)?$/;\n var FIRST_SEGMENT_REGEX = /^(?=([^\\/?#]*))\\1([^]*)$/;\n var SLASH_DOT_REGEX = /(?:\\/|^)\\.(?=\\/)/g;\n var SLASH_DOT_DOT_REGEX = /(?:\\/|^)\\.\\.\\/(?!\\.\\.\\/)[^\\/]*(?=\\/)/g;\n\n var URLToolkit = {\n // If opts.alwaysNormalize is true then the path will always be normalized even when it starts with / or //\n // E.g\n // With opts.alwaysNormalize = false (default, spec compliant)\n // http://a.com/b/cd + /e/f/../g => http://a.com/e/f/../g\n // With opts.alwaysNormalize = true (not spec compliant)\n // http://a.com/b/cd + /e/f/../g => http://a.com/e/g\n buildAbsoluteURL: function (baseURL, relativeURL, opts) {\n opts = opts || {};\n // remove any remaining space and CRLF\n baseURL = baseURL.trim();\n relativeURL = relativeURL.trim();\n if (!relativeURL) {\n // 2a) If the embedded URL is entirely empty, it inherits the\n // entire base URL (i.e., is set equal to the base URL)\n // and we are done.\n if (!opts.alwaysNormalize) {\n return baseURL;\n }\n var basePartsForNormalise = URLToolkit.parseURL(baseURL);\n if (!basePartsForNormalise) {\n throw new Error('Error trying to parse base URL.');\n }\n basePartsForNormalise.path = URLToolkit.normalizePath(\n basePartsForNormalise.path\n );\n return URLToolkit.buildURLFromParts(basePartsForNormalise);\n }\n var relativeParts = URLToolkit.parseURL(relativeURL);\n if (!relativeParts) {\n throw new Error('Error trying to parse relative URL.');\n }\n if (relativeParts.scheme) {\n // 2b) If the embedded URL starts with a scheme name, it is\n // interpreted as an absolute URL and we are done.\n if (!opts.alwaysNormalize) {\n return relativeURL;\n }\n relativeParts.path = URLToolkit.normalizePath(relativeParts.path);\n return URLToolkit.buildURLFromParts(relativeParts);\n }\n var baseParts = URLToolkit.parseURL(baseURL);\n if (!baseParts) {\n throw new Error('Error trying to parse base URL.');\n }\n if (!baseParts.netLoc && baseParts.path && baseParts.path[0] !== '/') {\n // If netLoc missing and path doesn't start with '/', assume everthing before the first '/' is the netLoc\n // This causes 'example.com/a' to be handled as '//example.com/a' instead of '/example.com/a'\n var pathParts = FIRST_SEGMENT_REGEX.exec(baseParts.path);\n baseParts.netLoc = pathParts[1];\n baseParts.path = pathParts[2];\n }\n if (baseParts.netLoc && !baseParts.path) {\n baseParts.path = '/';\n }\n var builtParts = {\n // 2c) Otherwise, the embedded URL inherits the scheme of\n // the base URL.\n scheme: baseParts.scheme,\n netLoc: relativeParts.netLoc,\n path: null,\n params: relativeParts.params,\n query: relativeParts.query,\n fragment: relativeParts.fragment,\n };\n if (!relativeParts.netLoc) {\n // 3) If the embedded URL's <net_loc> is non-empty, we skip to\n // Step 7. Otherwise, the embedded URL inherits the <net_loc>\n // (if any) of the base URL.\n builtParts.netLoc = baseParts.netLoc;\n // 4) If the embedded URL path is preceded by a slash \"/\", the\n // path is not relative and we skip to Step 7.\n if (relativeParts.path[0] !== '/') {\n if (!relativeParts.path) {\n // 5) If the embedded URL path is empty (and not preceded by a\n // slash), then the embedded URL inherits the base URL path\n builtParts.path = baseParts.path;\n // 5a) if the embedded URL's <params> is non-empty, we skip to\n // step 7; otherwise, it inherits the <params> of the base\n // URL (if any) and\n if (!relativeParts.params) {\n builtParts.params = baseParts.params;\n // 5b) if the embedded URL's <query> is non-empty, we skip to\n // step 7; otherwise, it inherits the <query> of the base\n // URL (if any) and we skip to step 7.\n if (!relativeParts.query) {\n builtParts.query = baseParts.query;\n }\n }\n } else {\n // 6) The last segment of the base URL's path (anything\n // following the rightmost slash \"/\", or the entire path if no\n // slash is present) is removed and the embedded URL's path is\n // appended in its place.\n var baseURLPath = baseParts.path;\n var newPath =\n baseURLPath.substring(0, baseURLPath.lastIndexOf('/') + 1) +\n relativeParts.path;\n builtParts.path = URLToolkit.normalizePath(newPath);\n }\n }\n }\n if (builtParts.path === null) {\n builtParts.path = opts.alwaysNormalize\n ? URLToolkit.normalizePath(relativeParts.path)\n : relativeParts.path;\n }\n return URLToolkit.buildURLFromParts(builtParts);\n },\n parseURL: function (url) {\n var parts = URL_REGEX.exec(url);\n if (!parts) {\n return null;\n }\n return {\n scheme: parts[1] || '',\n netLoc: parts[2] || '',\n path: parts[3] || '',\n params: parts[4] || '',\n query: parts[5] || '',\n fragment: parts[6] || '',\n };\n },\n normalizePath: function (path) {\n // The following operations are\n // then applied, in order, to the new path:\n // 6a) All occurrences of \"./\", where \".\" is a complete path\n // segment, are removed.\n // 6b) If the path ends with \".\" as a complete path segment,\n // that \".\" is removed.\n path = path.split('').reverse().join('').replace(SLASH_DOT_REGEX, '');\n // 6c) All occurrences of \"<segment>/../\", where <segment> is a\n // complete path segment not equal to \"..\", are removed.\n // Removal of these path segments is performed iteratively,\n // removing the leftmost matching pattern on each iteration,\n // until no matching pattern remains.\n // 6d) If the path ends with \"<segment>/..\", where <segment> is a\n // complete path segment not equal to \"..\", that\n // \"<segment>/..\" is removed.\n while (\n path.length !== (path = path.replace(SLASH_DOT_DOT_REGEX, '')).length\n ) {}\n return path.split('').reverse().join('');\n },\n buildURLFromParts: function (parts) {\n return (\n parts.scheme +\n parts.netLoc +\n parts.path +\n parts.params +\n parts.query +\n parts.fragment\n );\n },\n };\n\n if (typeof exports === 'object' && typeof module === 'object')\n module.exports = URLToolkit;\n else if (typeof define === 'function' && define.amd)\n define([], function () {\n return URLToolkit;\n });\n else if (typeof exports === 'object') exports['URLToolkit'] = URLToolkit;\n else root['URLToolkit'] = URLToolkit;\n})(this);\n","import { buildAbsoluteURL } from 'url-toolkit';\nimport { LevelKey } from './level-key';\nimport { LoadStats } from './load-stats';\nimport { AttrList } from '../utils/attr-list';\nimport type {\n FragmentLoaderContext,\n KeyLoaderContext,\n Loader,\n PlaylistLevelType,\n} from '../types/loader';\nimport type { KeySystemFormats } from '../utils/mediakeys-helper';\n\nexport const enum ElementaryStreamTypes {\n AUDIO = 'audio',\n VIDEO = 'video',\n AUDIOVIDEO = 'audiovideo',\n}\n\nexport interface ElementaryStreamInfo {\n startPTS: number;\n endPTS: number;\n startDTS: number;\n endDTS: number;\n partial?: boolean;\n}\n\nexport type ElementaryStreams = Record<\n ElementaryStreamTypes,\n ElementaryStreamInfo | null\n>;\n\nexport class BaseSegment {\n private _byteRange: number[] | null = null;\n private _url: string | null = null;\n\n // baseurl is the URL to the playlist\n public readonly baseurl: string;\n // relurl is the portion of the URL that comes from inside the playlist.\n public relurl?: string;\n // Holds the types of data this fragment supports\n public elementaryStreams: ElementaryStreams = {\n [ElementaryStreamTypes.AUDIO]: null,\n [ElementaryStreamTypes.VIDEO]: null,\n [ElementaryStreamTypes.AUDIOVIDEO]: null,\n };\n\n constructor(baseurl: string) {\n this.baseurl = baseurl;\n }\n\n // setByteRange converts a EXT-X-BYTERANGE attribute into a two element array\n setByteRange(value: string, previous?: BaseSegment) {\n const params = value.split('@', 2);\n const byteRange: number[] = [];\n if (params.length === 1) {\n byteRange[0] = previous ? previous.byteRangeEndOffset : 0;\n } else {\n byteRange[0] = parseInt(params[1]);\n }\n byteRange[1] = parseInt(params[0]) + byteRange[0];\n this._byteRange = byteRange;\n }\n\n get byteRange(): number[] {\n if (!this._byteRange) {\n return [];\n }\n\n return this._byteRange;\n }\n\n get byteRangeStartOffset(): number {\n return this.byteRange[0];\n }\n\n get byteRangeEndOffset(): number {\n return this.byteRange[1];\n }\n\n get url(): string {\n if (!this._url && this.baseurl && this.relurl) {\n this._url = buildAbsoluteURL(this.baseurl, this.relurl, {\n alwaysNormalize: true,\n });\n }\n return this._url || '';\n }\n\n set url(value: string) {\n this._url = value;\n }\n}\n\n/**\n * Object representing parsed data from an HLS Segment. Found in {@link hls.js#LevelDetails.fragments}.\n */\nexport class Fragment extends BaseSegment {\n private _decryptdata: LevelKey | null = null;\n\n public rawProgramDateTime: string | null = null;\n public programDateTime: number | null = null;\n public tagList: Array<string[]> = [];\n\n // EXTINF has to be present for a m3u8 to be considered valid\n public duration: number = 0;\n // sn notates the sequence number for a segment, and if set to a string can be 'initSegment'\n public sn: number | 'initSegment' = 0;\n // levelkeys are the EXT-X-KEY tags that apply to this segment for decryption\n // core difference from the private field _decryptdata is the lack of the initialized IV\n // _decryptdata will set the IV for this segment based on the segment number in the fragment\n public levelkeys?: { [key: string]: LevelKey };\n // A string representing the fragment type\n public readonly type: PlaylistLevelType;\n // A reference to the loader. Set while the fragment is loading, and removed afterwards. Used to abort fragment loading\n public loader: Loader<FragmentLoaderContext> | null = null;\n // A reference to the key loader. Set while the key is loading, and removed afterwards. Used to abort key loading\n public keyLoader: Loader<KeyLoaderContext> | null = null;\n // The level/track index to which the fragment belongs\n public level: number = -1;\n // The continuity counter of the fragment\n public cc: number = 0;\n // The starting Presentation Time Stamp (PTS) of the fragment. Set after transmux complete.\n public startPTS?: number;\n // The ending Presentation Time Stamp (PTS) of the fragment. Set after transmux complete.\n public endPTS?: number;\n // The starting Decode Time Stamp (DTS) of the fragment. Set after transmux complete.\n public startDTS!: number;\n // The ending Decode Time Stamp (DTS) of the fragment. Set after transmux complete.\n public endDTS!: number;\n // The start time of the fragment, as listed in the manifest. Updated after transmux complete.\n public start: number = 0;\n // Set by `updateFragPTSDTS` in level-helper\n public deltaPTS?: number;\n // The maximum starting Presentation Time Stamp (audio/video PTS) of the fragment. Set after transmux complete.\n public maxStartPTS?: number;\n // The minimum ending Presentation Time Stamp (audio/video PTS) of the fragment. Set after transmux complete.\n public minEndPTS?: number;\n // Load/parse timing information\n public stats: LoadStats = new LoadStats();\n public urlId: number = 0;\n public data?: Uint8Array;\n // A flag indicating whether the segment was downloaded in order to test bitrate, and was not buffered\n public bitrateTest: boolean = false;\n // #EXTINF segment title\n public title: string | null = null;\n // The Media Initialization Section for this segment\n public initSegment: Fragment | null = null;\n // Fragment is the last fragment in the media playlist\n public endList?: boolean;\n // Fragment is marked by an EXT-X-GAP tag indicating that it does not contain media data and should not be loaded\n public gap?: boolean;\n\n constructor(type: PlaylistLevelType, baseurl: string) {\n super(baseurl);\n this.type = type;\n }\n\n get decryptdata(): LevelKey | null {\n const { levelkeys } = this;\n if (!levelkeys && !this._decryptdata) {\n return null;\n }\n\n if (!this._decryptdata && this.levelkeys && !this.levelkeys.NONE) {\n const key = this.levelkeys.identity;\n if (key) {\n this._decryptdata = key.getDecryptData(this.sn);\n } else {\n const keyFormats = Object.keys(this.levelkeys);\n if (keyFormats.length === 1) {\n return (this._decryptdata = this.levelkeys[\n keyFormats[0]\n ].getDecryptData(this.sn));\n } else {\n // Multiple keys. key-loader to call Fragment.setKeyFormat based on selected key-system.\n }\n }\n }\n\n return this._decryptdata;\n }\n\n get end(): number {\n return this.start + this.duration;\n }\n\n get endProgramDateTime() {\n if (this.programDateTime === null) {\n return null;\n }\n\n if (!Number.isFinite(this.programDateTime)) {\n return null;\n }\n\n const duration = !Number.isFinite(this.duration) ? 0 : this.duration;\n\n return this.programDateTime + duration * 1000;\n }\n\n get encrypted() {\n // At the m3u8-parser level we need to add support for manifest signalled keyformats\n // when we want the fragment to start reporting that it is encrypted.\n // Currently, keyFormat will only be set for identity keys\n if (this._decryptdata?.encrypted) {\n return true;\n } else if (this.levelkeys) {\n const keyFormats = Object.keys(this.levelkeys);\n const len = keyFormats.length;\n if (len > 1 || (len === 1 && this.levelkeys[keyFormats[0]].encrypted)) {\n return true;\n }\n }\n\n return false;\n }\n\n setKeyFormat(keyFormat: KeySystemFormats) {\n if (this.levelkeys) {\n const key = this.levelkeys[keyFormat];\n if (key && !this._decryptdata) {\n this._decryptdata = key.getDecryptData(this.sn);\n }\n }\n }\n\n abortRequests(): void {\n this.loader?.abort();\n this.keyLoader?.abort();\n }\n\n setElementaryStreamInfo(\n type: ElementaryStreamTypes,\n startPTS: number,\n endPTS: number,\n startDTS: number,\n endDTS: number,\n partial: boolean = false\n ) {\n const { elementaryStreams } = this;\n const info = elementaryStreams[type];\n if (!info) {\n elementaryStreams[type] = {\n startPTS,\n endPTS,\n startDTS,\n endDTS,\n partial,\n };\n return;\n }\n\n info.startPTS = Math.min(info.startPTS, startPTS);\n info.endPTS = Math.max(info.endPTS, endPTS);\n info.startDTS = Math.min(info.startDTS, startDTS);\n info.endDTS = Math.max(info.endDTS, endDTS);\n }\n\n clearElementaryStreamInfo() {\n const { elementaryStreams } = this;\n elementaryStreams[ElementaryStreamTypes.AUDIO] = null;\n elementaryStreams[ElementaryStreamTypes.VIDEO] = null;\n elementaryStreams[ElementaryStreamTypes.AUDIOVIDEO] = null;\n }\n}\n\n/**\n * Object representing parsed data from an HLS Partial Segment. Found in {@link hls.js#LevelDetails.partList}.\n */\nexport class Part extends BaseSegment {\n public readonly fragOffset: number = 0;\n public readonly duration: number = 0;\n public readonly gap: boolean = false;\n public readonly independent: boolean = false;\n public readonly relurl: string;\n public readonly fragment: Fragment;\n public readonly index: number;\n public stats: LoadStats = new LoadStats();\n\n constructor(\n partAttrs: AttrList,\n frag: Fragment,\n baseurl: string,\n index: number,\n previous?: Part\n ) {\n super(baseurl);\n this.duration = partAttrs.decimalFloatingPoint('DURATION');\n this.gap = partAttrs.bool('GAP');\n this.independent = partAttrs.bool('INDEPENDENT');\n this.relurl = partAttrs.enumeratedString('URI') as string;\n this.fragment = frag;\n this.index = index;\n const byteRange = partAttrs.enumeratedString('BYTERANGE');\n if (byteRange) {\n this.setByteRange(byteRange, previous);\n }\n if (previous) {\n this.fragOffset = previous.fragOffset + previous.duration;\n }\n }\n\n get start(): number {\n return this.fragment.start + this.fragOffset;\n }\n\n get end(): number {\n return this.start + this.duration;\n }\n\n get loaded(): boolean {\n const { elementaryStreams } = this;\n return !!(\n elementaryStreams.audio ||\n elementaryStreams.video ||\n elementaryStreams.audiovideo\n );\n }\n}\n","type RawFrame = { type: string; size: number; data: Uint8Array };\n\n// breaking up those two types in order to clarify what is happening in the decoding path.\ntype DecodedFrame<T> = { key: string; data: T; info?: any };\nexport type Frame = DecodedFrame<ArrayBuffer | string>;\n\n/**\n * Returns true if an ID3 header can be found at offset in data\n * @param data - The data to search\n * @param offset - The offset at which to start searching\n */\nexport const isHeader = (data: Uint8Array, offset: number): boolean => {\n /*\n * http://id3.org/id3v2.3.0\n * [0] = 'I'\n * [1] = 'D'\n * [2] = '3'\n * [3,4] = {Version}\n * [5] = {Flags}\n * [6-9] = {ID3 Size}\n *\n * An ID3v2 tag can be detected with the following pattern:\n * $49 44 33 yy yy xx zz zz zz zz\n * Where yy is less than $FF, xx is the 'flags' byte and zz is less than $80\n */\n if (offset + 10 <= data.length) {\n // look for 'ID3' identifier\n if (\n data[offset] === 0x49 &&\n data[offset + 1] === 0x44 &&\n data[offset + 2] === 0x33\n ) {\n // check version is within range\n if (data[offset + 3] < 0xff && data[offset + 4] < 0xff) {\n // check size is within range\n if (\n data[offset + 6] < 0x80 &&\n data[offset + 7] < 0x80 &&\n data[offset + 8] < 0x80 &&\n data[offset + 9] < 0x80\n ) {\n return true;\n }\n }\n }\n }\n\n return false;\n};\n\n/**\n * Returns true if an ID3 footer can be found at offset in data\n * @param data - The data to search\n * @param offset - The offset at which to start searching\n */\nexport const isFooter = (data: Uint8Array, offset: number): boolean => {\n /*\n * The footer is a copy of the header, but with a different identifier\n */\n if (offset + 10 <= data.length) {\n // look for '3DI' identifier\n if (\n data[offset] === 0x33 &&\n data[offset + 1] === 0x44 &&\n data[offset + 2] === 0x49\n ) {\n // check version is within range\n if (data[offset + 3] < 0xff && data[offset + 4] < 0xff) {\n // check size is within range\n if (\n data[offset + 6] < 0x80 &&\n data[offset + 7] < 0x80 &&\n data[offset + 8] < 0x80 &&\n data[offset + 9] < 0x80\n ) {\n return true;\n }\n }\n }\n }\n\n return false;\n};\n\n/**\n * Returns any adjacent ID3 tags found in data starting at offset, as one block of data\n * @param data - The data to search in\n * @param offset - The offset at which to start searching\n * @returns the block of data containing any ID3 tags found\n * or *undefined* if no header is found at the starting offset\n */\nexport const getID3Data = (\n data: Uint8Array,\n offset: number\n): Uint8Array | undefined => {\n const front = offset;\n let length = 0;\n\n while (isHeader(data, offset)) {\n // ID3 header is 10 bytes\n length += 10;\n\n const size = readSize(data, offset + 6);\n length += size;\n\n if (isFooter(data, offset + 10)) {\n // ID3 footer is 10 bytes\n length += 10;\n }\n\n offset += length;\n }\n\n if (length > 0) {\n return data.subarray(front, front + length);\n }\n\n return undefined;\n};\n\nconst readSize = (data: Uint8Array, offset: number): number => {\n let size = 0;\n size = (data[offset] & 0x7f) << 21;\n size |= (data[offset + 1] & 0x7f) << 14;\n size |= (data[offset + 2] & 0x7f) << 7;\n size |= data[offset + 3] & 0x7f;\n return size;\n};\n\nexport const canParse = (data: Uint8Array, offset: number): boolean => {\n return (\n isHeader(data, offset) &&\n readSize(data, offset + 6) + 10 <= data.length - offset\n );\n};\n\n/**\n * Searches for the Elementary Stream timestamp found in the ID3 data chunk\n * @param data - Block of data containing one or more ID3 tags\n */\nexport const getTimeStamp = (data: Uint8Array): number | undefined => {\n const frames: Frame[] = getID3Frames(data);\n\n for (let i = 0; i < frames.length; i++) {\n const frame = frames[i];\n\n if (isTimeStampFrame(frame)) {\n return readTimeStamp(frame as DecodedFrame<ArrayBuffer>);\n }\n }\n\n return undefined;\n};\n\n/**\n * Returns true if the ID3 frame is an Elementary Stream timestamp frame\n */\nexport const isTimeStampFrame = (frame: Frame): boolean => {\n return (\n frame &&\n frame.key === 'PRIV' &&\n frame.info === 'com.apple.streaming.transportStreamTimestamp'\n );\n};\n\nconst getFrameData = (data: Uint8Array): RawFrame => {\n /*\n Frame ID $xx xx xx xx (four characters)\n Size $xx xx xx xx\n Flags $xx xx\n */\n const type: string = String.fromCharCode(data[0], data[1], data[2], data[3]);\n const size: number = readSize(data, 4);\n\n // skip frame id, size, and flags\n const offset = 10;\n\n return { type, size, data: data.subarray(offset, offset + size) };\n};\n\n/**\n * Returns an array of ID3 frames found in all the ID3 tags in the id3Data\n * @param id3Data - The ID3 data containing one or more ID3 tags\n */\nexport const getID3Frames = (id3Data: Uint8Array): Frame[] => {\n let offset = 0;\n const frames: Frame[] = [];\n\n while (isHeader(id3Data, offset)) {\n const size = readSize(id3Data, offset + 6);\n // skip past ID3 header\n offset += 10;\n const end = offset + size;\n // loop through frames in the ID3 tag\n while (offset + 8 < end) {\n const frameData: RawFrame = getFrameData(id3Data.subarray(offset));\n const frame: Frame | undefined = decodeFrame(frameData);\n if (frame) {\n frames.push(frame);\n }\n\n // skip frame header and frame data\n offset += frameData.size + 10;\n }\n\n if (isFooter(id3Data, offset)) {\n offset += 10;\n }\n }\n\n return frames;\n};\n\nexport const decodeFrame = (frame: RawFrame): Frame | undefined => {\n if (frame.type === 'PRIV') {\n return decodePrivFrame(frame);\n } else if (frame.type[0] === 'W') {\n return decodeURLFrame(frame);\n }\n\n return decodeTextFrame(frame);\n};\n\nconst decodePrivFrame = (\n frame: RawFrame\n): DecodedFrame<ArrayBuffer> | undefined => {\n /*\n Format: <text string>\\0<binary data>\n */\n if (frame.size < 2) {\n return undefined;\n }\n\n const owner = utf8ArrayToStr(frame.data, true);\n const privateData = new Uint8Array(frame.data.subarray(owner.length + 1));\n\n return { key: frame.type, info: owner, data: privateData.buffer };\n};\n\nconst decodeTextFrame = (frame: RawFrame): DecodedFrame<string> | undefined => {\n if (frame.size < 2) {\n return undefined;\n }\n\n if (frame.type === 'TXXX') {\n /*\n Format:\n [0] = {Text Encoding}\n [1-?] = {Description}\\0{Value}\n */\n let index = 1;\n const description = utf8ArrayToStr(frame.data.subarray(index), true);\n\n index += description.length + 1;\n const value = utf8ArrayToStr(frame.data.subarray(index));\n\n return { key: frame.type, info: description, data: value };\n }\n /*\n Format:\n [0] = {Text Encoding}\n [1-?] = {Value}\n */\n const text = utf8ArrayToStr(frame.data.subarray(1));\n return { key: frame.type, data: text };\n};\n\nconst decodeURLFrame = (frame: RawFrame): DecodedFrame<string> | undefined => {\n if (frame.type === 'WXXX') {\n /*\n Format:\n [0] = {Text Encoding}\n [1-?] = {Description}\\0{URL}\n */\n if (frame.size < 2) {\n return undefined;\n }\n\n let index = 1;\n const description: string = utf8ArrayToStr(\n frame.data.subarray(index),\n true\n );\n\n index += description.length + 1;\n const value: string = utf8ArrayToStr(frame.data.subarray(index));\n\n return { key: frame.type, info: description, data: value };\n }\n /*\n Format:\n [0-?] = {URL}\n */\n const url: string = utf8ArrayToStr(frame.data);\n return { key: frame.type, data: url };\n};\n\nconst readTimeStamp = (\n timeStampFrame: DecodedFrame<ArrayBuffer>\n): number | undefined => {\n if (timeStampFrame.data.byteLength === 8) {\n const data = new Uint8Array(timeStampFrame.data);\n // timestamp is 33 bit expressed as a big-endian eight-octet number,\n // with the upper 31 bits set to zero.\n const pts33Bit = data[3] & 0x1;\n let timestamp =\n (data[4] << 23) + (data[5] << 15) + (data[6] << 7) + data[7];\n timestamp /= 45;\n\n if (pts33Bit) {\n timestamp += 47721858.84;\n } // 2^32 / 90\n\n return Math.round(timestamp);\n }\n\n return undefined;\n};\n\n// http://stackoverflow.com/questions/8936984/uint8array-to-string-in-javascript/22373197\n// http://www.onicos.com/staff/iz/amuse/javascript/expert/utf.txt\n/* utf.js - UTF-8 <=> UTF-16 convertion\n *\n * Copyright (C) 1999 Masanao Izumo <[email protected]>\n * Version: 1.0\n * LastModified: Dec 25 1999\n * This library is free. You can redistribute it and/or modify it.\n */\nexport const utf8ArrayToStr = (\n array: Uint8Array,\n exitOnNull: boolean = false\n): string => {\n const decoder = getTextDecoder();\n if (decoder) {\n const decoded = decoder.decode(array);\n\n if (exitOnNull) {\n // grab up to the first null\n const idx = decoded.indexOf('\\0');\n return idx !== -1 ? decoded.substring(0, idx) : decoded;\n }\n\n // remove any null characters\n return decoded.replace(/\\0/g, '');\n }\n\n const len = array.length;\n let c;\n let char2;\n let char3;\n let out = '';\n let i = 0;\n while (i < len) {\n c = array[i++];\n if (c === 0x00 && exitOnNull) {\n return out;\n } else if (c === 0x00 || c === 0x03) {\n // If the character is 3 (END_OF_TEXT) or 0 (NULL) then skip it\n continue;\n }\n switch (c >> 4) {\n case 0:\n case 1:\n case 2:\n case 3:\n case 4:\n case 5:\n case 6:\n case 7:\n // 0xxxxxxx\n out += String.fromCharCode(c);\n break;\n case 12:\n case 13:\n // 110x xxxx 10xx xxxx\n char2 = array[i++];\n out += String.fromCharCode(((c & 0x1f) << 6) | (char2 & 0x3f));\n break;\n case 14:\n // 1110 xxxx 10xx xxxx 10xx xxxx\n char2 = array[i++];\n char3 = array[i++];\n out += String.fromCharCode(\n ((c & 0x0f) << 12) | ((char2 & 0x3f) << 6) | ((char3 & 0x3f) << 0)\n );\n break;\n default:\n }\n }\n return out;\n};\n\nexport const testables = {\n decodeTextFrame: decodeTextFrame,\n};\n\nlet decoder: TextDecoder;\n\nfunction getTextDecoder() {\n if (!decoder && typeof self.TextDecoder !== 'undefined') {\n decoder = new self.TextDecoder('utf-8');\n }\n\n return decoder;\n}\n","/**\n * hex dump helper class\n */\n\nconst Hex = {\n hexDump: function (array: Uint8Array) {\n let str = '';\n for (let i = 0; i < array.length; i++) {\n let h = array[i].toString(16);\n if (h.length < 2) {\n h = '0' + h;\n }\n\n str += h;\n }\n return str;\n },\n};\n\nexport default Hex;\n","import { ElementaryStreamTypes } from '../loader/fragment';\nimport { sliceUint8 } from './typed-array';\nimport { utf8ArrayToStr } from '../demux/id3';\nimport { logger } from '../utils/logger';\nimport Hex from './hex';\nimport type { PassthroughTrack, UserdataSample } from '../types/demuxer';\nimport type { DecryptData } from '../loader/level-key';\n\nconst UINT32_MAX = Math.pow(2, 32) - 1;\nconst push = [].push;\n\n// We are using fixed track IDs for driving the MP4 remuxer\n// instead of following the TS PIDs.\n// There is no reason not to do this and some browsers/SourceBuffer-demuxers\n// may not like if there are TrackID \"switches\"\n// See https://github.com/video-dev/hls.js/issues/1331\n// Here we are mapping our internal track types to constant MP4 track IDs\n// With MSE currently one can only have one track of each, and we are muxing\n// whatever video/audio rendition in them.\nexport const RemuxerTrackIdConfig = {\n video: 1,\n audio: 2,\n id3: 3,\n text: 4,\n};\n\nexport function bin2str(data: Uint8Array): string {\n return String.fromCharCode.apply(null, data);\n}\n\nexport function readUint16(buffer: Uint8Array, offset: number): number {\n const val = (buffer[offset] << 8) | buffer[offset + 1];\n return val < 0 ? 65536 + val : val;\n}\n\nexport function readUint32(buffer: Uint8Array, offset: number): number {\n const val = readSint32(buffer, offset);\n return val < 0 ? 4294967296 + val : val;\n}\n\nexport function readSint32(buffer: Uint8Array, offset: number): number {\n return (\n (buffer[offset] << 24) |\n (buffer[offset + 1] << 16) |\n (buffer[offset + 2] << 8) |\n buffer[offset + 3]\n );\n}\n\nexport function writeUint32(buffer: Uint8Array, offset: number, value: number) {\n buffer[offset] = value >> 24;\n buffer[offset + 1] = (value >> 16) & 0xff;\n buffer[offset + 2] = (value >> 8) & 0xff;\n buffer[offset + 3] = value & 0xff;\n}\n\n// Find the data for a box specified by its path\nexport function findBox(data: Uint8Array, path: string[]): Uint8Array[] {\n const results = [] as Uint8Array[];\n if (!path.length) {\n // short-circuit the search for empty paths\n return results;\n }\n const end = data.byteLength;\n\n for (let i = 0; i < end; ) {\n const size = readUint32(data, i);\n const type = bin2str(data.subarray(i + 4, i + 8));\n const endbox = size > 1 ? i + size : end;\n\n if (type === path[0]) {\n if (path.length === 1) {\n // this is the end of the path and we've found the box we were\n // looking for\n results.push(data.subarray(i + 8, endbox));\n } else {\n // recursively search for the next box along the path\n const subresults = findBox(data.subarray(i + 8, endbox), path.slice(1));\n if (subresults.length) {\n push.apply(results, subresults);\n }\n }\n }\n i = endbox;\n }\n\n // we've finished searching all of data\n return results;\n}\n\ntype SidxInfo = {\n earliestPresentationTime: number;\n timescale: number;\n version: number;\n referencesCount: number;\n references: any[];\n};\n\nexport function parseSegmentIndex(sidx: Uint8Array): SidxInfo | null {\n const references: any[] = [];\n\n const version = sidx[0];\n\n // set initial offset, we skip the reference ID (not needed)\n let index = 8;\n\n const timescale = readUint32(sidx, index);\n index += 4;\n\n // TODO: parse earliestPresentationTime and firstOffset\n // usually zero in our case\n const earliestPresentationTime = 0;\n const firstOffset = 0;\n\n if (version === 0) {\n index += 8;\n } else {\n index += 16;\n }\n\n // skip reserved\n index += 2;\n\n let startByte = sidx.length + firstOffset;\n\n const referencesCount = readUint16(sidx, index);\n index += 2;\n\n for (let i = 0; i < referencesCount; i++) {\n let referenceIndex = index;\n\n const referenceInfo = readUint32(sidx, referenceIndex);\n referenceIndex += 4;\n\n const referenceSize = referenceInfo & 0x7fffffff;\n const referenceType = (referenceInfo & 0x80000000) >>> 31;\n\n if (referenceType === 1) {\n logger.warn('SIDX has hierarchical references (not supported)');\n return null;\n }\n\n const subsegmentDuration = readUint32(sidx, referenceIndex);\n referenceIndex += 4;\n\n references.push({\n referenceSize,\n subsegmentDuration, // unscaled\n info: {\n duration: subsegmentDuration / timescale,\n start: startByte,\n end: startByte + referenceSize - 1,\n },\n });\n\n startByte += referenceSize;\n\n // Skipping 1 bit for |startsWithSap|, 3 bits for |sapType|, and 28 bits\n // for |sapDelta|.\n referenceIndex += 4;\n\n // skip to next ref\n index = referenceIndex;\n }\n\n return {\n earliestPresentationTime,\n timescale,\n version,\n referencesCount,\n references,\n };\n}\n\n/**\n * Parses an MP4 initialization segment and extracts stream type and\n * timescale values for any declared tracks. Timescale values indicate the\n * number of clock ticks per second to assume for time-based values\n * elsewhere in the MP4.\n *\n * To determine the start time of an MP4, you need two pieces of\n * information: the timescale unit and the earliest base media decode\n * time. Multiple timescales can be specified within an MP4 but the\n * base media decode time is always expressed in the timescale from\n * the media header box for the track:\n * ```\n * moov > trak > mdia > mdhd.timescale\n * moov > trak > mdia > hdlr\n * ```\n * @param initSegment the bytes of the init segment\n * @returns a hash of track type to timescale values or null if\n * the init segment is malformed.\n */\n\nexport interface InitDataTrack {\n timescale: number;\n id: number;\n codec: string;\n}\n\ntype HdlrType = ElementaryStreamTypes.AUDIO | ElementaryStreamTypes.VIDEO;\n\nexport interface InitData extends Array<any> {\n [index: number]:\n | {\n timescale: number;\n type: HdlrType;\n default?: {\n duration: number;\n flags: number;\n };\n }\n | undefined;\n audio?: InitDataTrack;\n video?: InitDataTrack;\n caption?: InitDataTrack;\n}\n\nexport function parseInitSegment(initSegment: Uint8Array): InitData {\n const result: InitData = [];\n const traks = findBox(initSegment, ['moov', 'trak']);\n for (let i = 0; i < traks.length; i++) {\n const trak = traks[i];\n const tkhd = findBox(trak, ['tkhd'])[0];\n if (tkhd) {\n let version = tkhd[0];\n let index = version === 0 ? 12 : 20;\n const trackId = readUint32(tkhd, index);\n const mdhd = findBox(trak, ['mdia', 'mdhd'])[0];\n if (mdhd) {\n version = mdhd[0];\n index = version === 0 ? 12 : 20;\n const timescale = readUint32(mdhd, index);\n const hdlr = findBox(trak, ['mdia', 'hdlr'])[0];\n if (hdlr) {\n const hdlrType = bin2str(hdlr.subarray(8, 12));\n const type: HdlrType | undefined = {\n soun: ElementaryStreamTypes.AUDIO as const,\n vide: ElementaryStreamTypes.VIDEO as const,\n }[hdlrType];\n if (type) {\n // Parse codec details\n const stsd = findBox(trak, ['mdia', 'minf', 'stbl', 'stsd'])[0];\n let codec;\n if (stsd) {\n codec = bin2str(stsd.subarray(12, 16));\n // TODO: Parse codec details to be able to build MIME type.\n // stsd.start += 8;\n // const codecBox = findBox(stsd, [codec])[0];\n // if (codecBox) {\n // TODO: Codec parsing support for avc1, mp4a, hevc, av01...\n // }\n }\n result[trackId] = { timescale, type };\n result[type] = { timescale, id: trackId, codec };\n }\n }\n }\n }\n }\n\n const trex = findBox(initSegment, ['moov', 'mvex', 'trex']);\n trex.forEach((trex) => {\n const trackId = readUint32(trex, 4);\n const track = result[trackId];\n if (track) {\n track.default = {\n duration: readUint32(trex, 12),\n flags: readUint32(trex, 20),\n };\n }\n });\n\n return result;\n}\n\nexport function patchEncyptionData(\n initSegment: Uint8Array | undefined,\n decryptdata: DecryptData | null\n): Uint8Array | undefined {\n if (!initSegment || !decryptdata) {\n return initSegment;\n }\n const keyId = decryptdata.keyId;\n if (keyId && decryptdata.isCommonEncryption) {\n const traks = findBox(initSegment, ['moov', 'trak']);\n traks.forEach((trak) => {\n const stsd = findBox(trak, ['mdia', 'minf', 'stbl', 'stsd'])[0];\n\n // skip the sample entry count\n const sampleEntries = stsd.subarray(8);\n let encBoxes = findBox(sampleEntries, ['enca']);\n const isAudio = encBoxes.length > 0;\n if (!isAudio) {\n encBoxes = findBox(sampleEntries, ['encv']);\n }\n encBoxes.forEach((enc) => {\n const encBoxChildren = isAudio ? enc.subarray(28) : enc.subarray(78);\n const sinfBoxes = findBox(encBoxChildren, ['sinf']);\n sinfBoxes.forEach((sinf) => {\n const tenc = parseSinf(sinf);\n if (tenc) {\n // Look for default key id (keyID offset is always 8 within the tenc box):\n const tencKeyId = tenc.subarray(8, 24);\n if (!tencKeyId.some((b) => b !== 0)) {\n logger.log(\n `[eme] Patching keyId in 'enc${\n isAudio ? 'a' : 'v'\n }>sinf>>tenc' box: ${Hex.hexDump(tencKeyId)} -> ${Hex.hexDump(\n keyId\n )}`\n );\n tenc.set(keyId, 8);\n }\n }\n });\n });\n });\n }\n\n return initSegment;\n}\n\nexport function parseSinf(sinf: Uint8Array): Uint8Array | null {\n const schm = findBox(sinf, ['schm'])[0];\n if (schm) {\n const scheme = bin2str(schm.subarray(4, 8));\n if (scheme === 'cbcs' || scheme === 'cenc') {\n return findBox(sinf, ['schi', 'tenc'])[0];\n }\n }\n logger.error(`[eme] missing 'schm' box`);\n return null;\n}\n\n/**\n * Determine the base media decode start time, in seconds, for an MP4\n * fragment. If multiple fragments are specified, the earliest time is\n * returned.\n *\n * The base media decode time can be parsed from track fragment\n * metadata:\n * ```\n * moof > traf > tfdt.baseMediaDecodeTime\n * ```\n * It requires the timescale value from the mdhd to interpret.\n *\n * @param initData - a hash of track type to timescale values\n * @param fmp4 - the bytes of the mp4 fragment\n * @returns the earliest base media decode start time for the\n * fragment, in seconds\n */\nexport function getStartDTS(\n initData: InitData,\n fmp4: Uint8Array\n): number | null {\n // we need info from two children of each track fragment box\n return findBox(fmp4, ['moof', 'traf']).reduce(\n (result: number | null, traf) => {\n const tfdt = findBox(traf, ['tfdt'])[0];\n const version = tfdt[0];\n const start = findBox(traf, ['tfhd']).reduce(\n (result: number | null, tfhd) => {\n // get the track id from the tfhd\n const id = readUint32(tfhd, 4);\n const track = initData[id];\n if (track) {\n let baseTime = readUint32(tfdt, 4);\n if (version === 1) {\n // If value is too large, assume signed 64-bit. Negative track fragment decode times are invalid, but they exist in the wild.\n // This prevents large values from being used for initPTS, which can cause playlist sync issues.\n // https://github.com/video-dev/hls.js/issues/5303\n if (baseTime === UINT32_MAX) {\n logger.warn(\n `[mp4-demuxer]: Ignoring assumed invalid signed 64-bit track fragment decode time`\n );\n return result;\n }\n baseTime *= UINT32_MAX + 1;\n baseTime += readUint32(tfdt, 8);\n }\n // assume a 90kHz clock if no timescale was specified\n const scale = track.timescale || 90e3;\n // convert base time to seconds\n const startTime = baseTime / scale;\n if (\n isFinite(startTime) &&\n (result === null || startTime < result)\n ) {\n return startTime;\n }\n }\n return result;\n },\n null\n );\n if (\n start !== null &&\n isFinite(start) &&\n (result === null || start < result)\n ) {\n return start;\n }\n return result;\n },\n null\n );\n}\n\n/*\n For Reference:\n aligned(8) class TrackFragmentHeaderBox\n extends FullBox(‘tfhd’, 0, tf_flags){\n unsigned int(32) track_ID;\n // all the following are optional fields\n unsigned int(64) base_data_offset;\n unsigned int(32) sample_description_index;\n unsigned int(32) default_sample_duration;\n unsigned int(32) default_sample_size;\n unsigned int(32) default_sample_flags\n }\n */\nexport function getDuration(data: Uint8Array, initData: InitData) {\n let rawDuration = 0;\n let videoDuration = 0;\n let audioDuration = 0;\n const trafs = findBox(data, ['moof', 'traf']);\n for (let i = 0; i < trafs.length; i++) {\n const traf = trafs[i];\n // There is only one tfhd & trun per traf\n // This is true for CMAF style content, and we should perhaps check the ftyp\n // and only look for a single trun then, but for ISOBMFF we should check\n // for multiple track runs.\n const tfhd = findBox(traf, ['tfhd'])[0];\n // get the track id from the tfhd\n const id = readUint32(tfhd, 4);\n const track = initData[id];\n if (!track) {\n continue;\n }\n const trackDefault = track.default;\n const tfhdFlags = readUint32(tfhd, 0) | trackDefault?.flags!;\n let sampleDuration: number | undefined = trackDefault?.duration;\n if (tfhdFlags & 0x000008) {\n // 0x000008 indicates the presence of the default_sample_duration field\n if (tfhdFlags & 0x000002) {\n // 0x000002 indicates the presence of the sample_description_index field, which precedes default_sample_duration\n // If present, the default_sample_duration exists at byte offset 12\n sampleDuration = readUint32(tfhd, 12);\n } else {\n // Otherwise, the duration is at byte offset 8\n sampleDuration = readUint32(tfhd, 8);\n }\n }\n // assume a 90kHz clock if no timescale was specified\n const timescale = track.timescale || 90e3;\n const truns = findBox(traf, ['trun']);\n for (let j = 0; j < truns.length; j++) {\n rawDuration = computeRawDurationFromSamples(truns[j]);\n if (!rawDuration && sampleDuration) {\n const sampleCount = readUint32(truns[j], 4);\n rawDuration = sampleDuration * sampleCount;\n }\n if (track.type === ElementaryStreamTypes.VIDEO) {\n videoDuration += rawDuration / timescale;\n } else if (track.type === ElementaryStreamTypes.AUDIO) {\n audioDuration += rawDuration / timescale;\n }\n }\n }\n if (videoDuration === 0 && audioDuration === 0) {\n // If duration samples are not available in the traf use sidx subsegment_duration\n let sidxDuration = 0;\n const sidxs = findBox(data, ['sidx']);\n for (let i = 0; i < sidxs.length; i++) {\n const sidx = parseSegmentIndex(sidxs[i]);\n if (sidx?.references) {\n sidxDuration += sidx.references.reduce(\n (dur, ref) => dur + ref.info.duration || 0,\n 0\n );\n }\n }\n\n return sidxDuration;\n }\n if (videoDuration) {\n return videoDuration;\n }\n return audioDuration;\n}\n\n/*\n For Reference:\n aligned(8) class TrackRunBox\n extends FullBox(‘trun’, version, tr_flags) {\n unsigned int(32) sample_count;\n // the following are optional fields\n signed int(32) data_offset;\n unsigned int(32) first_sample_flags;\n // all fields in the following array are optional\n {\n unsigned int(32) sample_duration;\n unsigned int(32) sample_size;\n unsigned int(32) sample_flags\n if (version == 0)\n { unsigned int(32)\n else\n { signed int(32)\n }[ sample_count ]\n }\n */\nexport function computeRawDurationFromSamples(trun): number {\n const flags = readUint32(trun, 0);\n // Flags are at offset 0, non-optional sample_count is at offset 4. Therefore we start 8 bytes in.\n // Each field is an int32, which is 4 bytes\n let offset = 8;\n // data-offset-present flag\n if (flags & 0x000001) {\n offset += 4;\n }\n // first-sample-flags-present flag\n if (flags & 0x000004) {\n offset += 4;\n }\n\n let duration = 0;\n const sampleCount = readUint32(trun, 4);\n for (let i = 0; i < sampleCount; i++) {\n // sample-duration-present flag\n if (flags & 0x000100) {\n const sampleDuration = readUint32(trun, offset);\n duration += sampleDuration;\n offset += 4;\n }\n // sample-size-present flag\n if (flags & 0x000200) {\n offset += 4;\n }\n // sample-flags-present flag\n if (flags & 0x000400) {\n offset += 4;\n }\n // sample-composition-time-offsets-present flag\n if (flags & 0x000800) {\n offset += 4;\n }\n }\n return duration;\n}\n\nexport function offsetStartDTS(\n initData: InitData,\n fmp4: Uint8Array,\n timeOffset: number\n) {\n findBox(fmp4, ['moof', 'traf']).forEach((traf) => {\n findBox(traf, ['tfhd']).forEach((tfhd) => {\n // get the track id from the tfhd\n const id = readUint32(tfhd, 4);\n const track = initData[id];\n if (!track) {\n return;\n }\n // assume a 90kHz clock if no timescale was specified\n const timescale = track.timescale || 90e3;\n // get the base media decode time from the tfdt\n findBox(traf, ['tfdt']).forEach((tfdt) => {\n const version = tfdt[0];\n let baseMediaDecodeTime = readUint32(tfdt, 4);\n\n if (version === 0) {\n baseMediaDecodeTime -= timeOffset * timescale;\n baseMediaDecodeTime = Math.max(baseMediaDecodeTime, 0);\n writeUint32(tfdt, 4, baseMediaDecodeTime);\n } else {\n baseMediaDecodeTime *= Math.pow(2, 32);\n baseMediaDecodeTime += readUint32(tfdt, 8);\n baseMediaDecodeTime -= timeOffset * timescale;\n baseMediaDecodeTime = Math.max(baseMediaDecodeTime, 0);\n const upper = Math.floor(baseMediaDecodeTime / (UINT32_MAX + 1));\n const lower = Math.floor(baseMediaDecodeTime % (UINT32_MAX + 1));\n writeUint32(tfdt, 4, upper);\n writeUint32(tfdt, 8, lower);\n }\n });\n });\n });\n}\n\n// TODO: Check if the last moof+mdat pair is part of the valid range\nexport function segmentValidRange(data: Uint8Array): SegmentedRange {\n const segmentedRange: SegmentedRange = {\n valid: null,\n remainder: null,\n };\n\n const moofs = findBox(data, ['moof']);\n if (!moofs) {\n return segmentedRange;\n } else if (moofs.length < 2) {\n segmentedRange.remainder = data;\n return segmentedRange;\n }\n const last = moofs[moofs.length - 1];\n // Offset by 8 bytes; findBox offsets the start by as much\n segmentedRange.valid = sliceUint8(data, 0, last.byteOffset - 8);\n segmentedRange.remainder = sliceUint8(data, last.byteOffset - 8);\n return segmentedRange;\n}\n\nexport interface SegmentedRange {\n valid: Uint8Array | null;\n remainder: Uint8Array | null;\n}\n\nexport function appendUint8Array(\n data1: Uint8Array,\n data2: Uint8Array\n): Uint8Array {\n const temp = new Uint8Array(data1.length + data2.length);\n temp.set(data1);\n temp.set(data2, data1.length);\n\n return temp;\n}\n\nexport interface IEmsgParsingData {\n schemeIdUri: string;\n value: string;\n timeScale: number;\n presentationTimeDelta?: number;\n presentationTime?: number;\n eventDuration: number;\n id: number;\n payload: Uint8Array;\n}\n\nexport function parseSamples(\n timeOffset: number,\n track: PassthroughTrack\n): UserdataSample[] {\n const seiSamples = [] as UserdataSample[];\n const videoData = track.samples;\n const timescale = track.timescale;\n const trackId = track.id;\n let isHEVCFlavor = false;\n\n const moofs = findBox(videoData, ['moof']);\n moofs.map((moof) => {\n const moofOffset = moof.byteOffset - 8;\n const trafs = findBox(moof, ['traf']);\n trafs.map((traf) => {\n // get the base media decode time from the tfdt\n const baseTime = findBox(traf, ['tfdt']).map((tfdt) => {\n const version = tfdt[0];\n let result = readUint32(tfdt, 4);\n if (version === 1) {\n result *= Math.pow(2, 32);\n result += readUint32(tfdt, 8);\n }\n return result / timescale;\n })[0];\n\n if (baseTime !== undefined) {\n timeOffset = baseTime;\n }\n\n return findBox(traf, ['tfhd']).map((tfhd) => {\n const id = readUint32(tfhd, 4);\n const tfhdFlags = readUint32(tfhd, 0) & 0xffffff;\n const baseDataOffsetPresent = (tfhdFlags & 0x000001) !== 0;\n const sampleDescriptionIndexPresent = (tfhdFlags & 0x000002) !== 0;\n const defaultSampleDurationPresent = (tfhdFlags & 0x000008) !== 0;\n let defaultSampleDuration = 0;\n const defaultSampleSizePresent = (tfhdFlags & 0x000010) !== 0;\n let defaultSampleSize = 0;\n const defaultSampleFlagsPresent = (tfhdFlags & 0x000020) !== 0;\n let tfhdOffset = 8;\n\n if (id === trackId) {\n if (baseDataOffsetPresent) {\n tfhdOffset += 8;\n }\n if (sampleDescriptionIndexPresent) {\n tfhdOffset += 4;\n }\n if (defaultSampleDurationPresent) {\n defaultSampleDuration = readUint32(tfhd, tfhdOffset);\n tfhdOffset += 4;\n }\n if (defaultSampleSizePresent) {\n defaultSampleSize = readUint32(tfhd, tfhdOffset);\n tfhdOffset += 4;\n }\n if (defaultSampleFlagsPresent) {\n tfhdOffset += 4;\n }\n if (track.type === 'video') {\n isHEVCFlavor = isHEVC(track.codec);\n }\n\n findBox(traf, ['trun']).map((trun) => {\n const version = trun[0];\n const flags = readUint32(trun, 0) & 0xffffff;\n const dataOffsetPresent = (flags & 0x000001) !== 0;\n let dataOffset = 0;\n const firstSampleFlagsPresent = (flags & 0x000004) !== 0;\n const sampleDurationPresent = (flags & 0x000100) !== 0;\n let sampleDuration = 0;\n const sampleSizePresent = (flags & 0x000200) !== 0;\n let sampleSize = 0;\n const sampleFlagsPresent = (flags & 0x000400) !== 0;\n const sampleCompositionOffsetsPresent = (flags & 0x000800) !== 0;\n let compositionOffset = 0;\n const sampleCount = readUint32(trun, 4);\n let trunOffset = 8; // past version, flags, and sample count\n\n if (dataOffsetPresent) {\n dataOffset = readUint32(trun, trunOffset);\n trunOffset += 4;\n }\n if (firstSampleFlagsPresent) {\n trunOffset += 4;\n }\n\n let sampleOffset = dataOffset + moofOffset;\n\n for (let ix = 0; ix < sampleCount; ix++) {\n if (sampleDurationPresent) {\n sampleDuration = readUint32(trun, trunOffset);\n trunOffset += 4;\n } else {\n sampleDuration = defaultSampleDuration;\n }\n if (sampleSizePresent) {\n sampleSize = readUint32(trun, trunOffset);\n trunOffset += 4;\n } else {\n sampleSize = defaultSampleSize;\n }\n if (sampleFlagsPresent) {\n trunOffset += 4;\n }\n if (sampleCompositionOffsetsPresent) {\n if (version === 0) {\n compositionOffset = readUint32(trun, trunOffset);\n } else {\n compositionOffset = readSint32(trun, trunOffset);\n }\n trunOffset += 4;\n }\n if (track.type === ElementaryStreamTypes.VIDEO) {\n let naluTotalSize = 0;\n while (naluTotalSize < sampleSize) {\n const naluSize = readUint32(videoData, sampleOffset);\n sampleOffset += 4;\n if (isSEIMessage(isHEVCFlavor, videoData[sampleOffset])) {\n const data = videoData.subarray(\n sampleOffset,\n sampleOffset + naluSize\n );\n parseSEIMessageFromNALu(\n data,\n isHEVCFlavor ? 2 : 1,\n timeOffset + compositionOffset / timescale,\n seiSamples\n );\n }\n sampleOffset += naluSize;\n naluTotalSize += naluSize + 4;\n }\n }\n\n timeOffset += sampleDuration / timescale;\n }\n });\n }\n });\n });\n });\n return seiSamples;\n}\n\nfunction isHEVC(codec: string) {\n if (!codec) {\n return false;\n }\n const delimit = codec.indexOf('.');\n const baseCodec = delimit < 0 ? codec : codec.substring(0, delimit);\n return (\n baseCodec === 'hvc1' ||\n baseCodec === 'hev1' ||\n // Dolby Vision\n baseCodec === 'dvh1' ||\n baseCodec === 'dvhe'\n );\n}\n\nfunction isSEIMessage(isHEVCFlavor: boolean, naluHeader: number) {\n if (isHEVCFlavor) {\n const naluType = (naluHeader >> 1) & 0x3f;\n return naluType === 39 || naluType === 40;\n } else {\n const naluType = naluHeader & 0x1f;\n return naluType === 6;\n }\n}\n\nexport function parseSEIMessageFromNALu(\n unescapedData: Uint8Array,\n headerSize: number,\n pts: number,\n samples: UserdataSample[]\n) {\n const data = discardEPB(unescapedData);\n let seiPtr = 0;\n // skip nal header\n seiPtr += headerSize;\n let payloadType = 0;\n let payloadSize = 0;\n let endOfCaptions = false;\n let b = 0;\n\n while (seiPtr < data.length) {\n payloadType = 0;\n do {\n if (seiPtr >= data.length) {\n break;\n }\n b = data[seiPtr++];\n payloadType += b;\n } while (b === 0xff);\n\n // Parse payload size.\n payloadSize = 0;\n do {\n if (seiPtr >= data.length) {\n break;\n }\n b = data[seiPtr++];\n payloadSize += b;\n } while (b === 0xff);\n\n const leftOver = data.length - seiPtr;\n\n if (!endOfCaptions && payloadType === 4 && seiPtr < data.length) {\n endOfCaptions = true;\n\n const countryCode = data[seiPtr++];\n if (countryCode === 181) {\n const providerCode = readUint16(data, seiPtr);\n seiPtr += 2;\n\n if (providerCode === 49) {\n const userStructure = readUint32(data, seiPtr);\n seiPtr += 4;\n\n if (userStructure === 0x47413934) {\n const userDataType = data[seiPtr++];\n\n // Raw CEA-608 bytes wrapped in CEA-708 packet\n if (userDataType === 3) {\n const firstByte = data[seiPtr++];\n const totalCCs = 0x1f & firstByte;\n const enabled = 0x40 & firstByte;\n const totalBytes = enabled ? 2 + totalCCs * 3 : 0;\n const byteArray = new Uint8Array(totalBytes);\n if (enabled) {\n byteArray[0] = firstByte;\n for (let i = 1; i < totalBytes; i++) {\n byteArray[i] = data[seiPtr++];\n }\n }\n\n samples.push({\n type: userDataType,\n payloadType,\n pts,\n bytes: byteArray,\n });\n }\n }\n }\n }\n } else if (payloadType === 5 && payloadSize < leftOver) {\n endOfCaptions = true;\n\n if (payloadSize > 16) {\n const uuidStrArray: Array<string> = [];\n for (let i = 0; i < 16; i++) {\n const b = data[seiPtr++].toString(16);\n uuidStrArray.push(b.length == 1 ? '0' + b : b);\n\n if (i === 3 || i === 5 || i === 7 || i === 9) {\n uuidStrArray.push('-');\n }\n }\n const length = payloadSize - 16;\n const userDataBytes = new Uint8Array(length);\n for (let i = 0; i < length; i++) {\n userDataBytes[i] = data[seiPtr++];\n }\n\n samples.push({\n payloadType,\n pts,\n uuid: uuidStrArray.join(''),\n userData: utf8ArrayToStr(userDataBytes),\n userDataBytes,\n });\n }\n } else if (payloadSize < leftOver) {\n seiPtr += payloadSize;\n } else if (payloadSize > leftOver) {\n break;\n }\n }\n}\n\n/**\n * remove Emulation Prevention bytes from a RBSP\n */\nexport function discardEPB(data: Uint8Array): Uint8Array {\n const length = data.byteLength;\n const EPBPositions = [] as Array<number>;\n let i = 1;\n\n // Find all `Emulation Prevention Bytes`\n while (i < length - 2) {\n if (data[i] === 0 && data[i + 1] === 0 && data[i + 2] === 0x03) {\n EPBPositions.push(i + 2);\n i += 2;\n } else {\n i++;\n }\n }\n\n // If no Emulation Prevention Bytes were found just return the original\n // array\n if (EPBPositions.length === 0) {\n return data;\n }\n\n // Create a new array to hold the NAL unit data\n const newLength = length - EPBPositions.length;\n const newData = new Uint8Array(newLength);\n let sourceIndex = 0;\n\n for (i = 0; i < newLength; sourceIndex++, i++) {\n if (sourceIndex === EPBPositions[0]) {\n // Skip this byte\n sourceIndex++;\n // Remove this position index\n EPBPositions.shift();\n }\n newData[i] = data[sourceIndex];\n }\n return newData;\n}\n\nexport function parseEmsg(data: Uint8Array): IEmsgParsingData {\n const version = data[0];\n let schemeIdUri: string = '';\n let value: string = '';\n let timeScale: number = 0;\n let presentationTimeDelta: number = 0;\n let presentationTime: number = 0;\n let eventDuration: number = 0;\n let id: number = 0;\n let offset: number = 0;\n\n if (version === 0) {\n while (bin2str(data.subarray(offset, offset + 1)) !== '\\0') {\n schemeIdUri += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n }\n\n schemeIdUri += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n\n while (bin2str(data.subarray(offset, offset + 1)) !== '\\0') {\n value += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n }\n\n value += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n\n timeScale = readUint32(data, 12);\n presentationTimeDelta = readUint32(data, 16);\n eventDuration = readUint32(data, 20);\n id = readUint32(data, 24);\n offset = 28;\n } else if (version === 1) {\n offset += 4;\n timeScale = readUint32(data, offset);\n offset += 4;\n const leftPresentationTime = readUint32(data, offset);\n offset += 4;\n const rightPresentationTime = readUint32(data, offset);\n offset += 4;\n presentationTime = 2 ** 32 * leftPresentationTime + rightPresentationTime;\n if (!Number.isSafeInteger(presentationTime)) {\n presentationTime = Number.MAX_SAFE_INTEGER;\n logger.warn(\n 'Presentation time exceeds safe integer limit and wrapped to max safe integer in parsing emsg box'\n );\n }\n\n eventDuration = readUint32(data, offset);\n offset += 4;\n id = readUint32(data, offset);\n offset += 4;\n\n while (bin2str(data.subarray(offset, offset + 1)) !== '\\0') {\n schemeIdUri += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n }\n\n schemeIdUri += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n\n while (bin2str(data.subarray(offset, offset + 1)) !== '\\0') {\n value += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n }\n\n value += bin2str(data.subarray(offset, offset + 1));\n offset += 1;\n }\n const payload = data.subarray(offset, data.byteLength);\n\n return {\n schemeIdUri,\n value,\n timeScale,\n presentationTime,\n presentationTimeDelta,\n eventDuration,\n id,\n payload,\n };\n}\n\nexport function mp4Box(type: ArrayLike<number>, ...payload: Uint8Array[]) {\n const len = payload.length;\n let size = 8;\n let i = len;\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 for (i = 0, size = 8; i < len; i++) {\n result.set(payload[i], size);\n size += payload[i].byteLength;\n }\n return result;\n}\n\nexport function mp4pssh(\n systemId: Uint8Array,\n keyids: Array<Uint8Array> | null,\n data: Uint8Array\n) {\n if (systemId.byteLength !== 16) {\n throw new RangeError('Invalid system id');\n }\n let version;\n let kids;\n if (keyids) {\n version = 1;\n kids = new Uint8Array(keyids.length * 16);\n for (let ix = 0; ix < keyids.length; ix++) {\n const k = keyids[ix]; // uint8array\n if (k.byteLength !== 16) {\n throw new RangeError('Invalid key');\n }\n kids.set(k, ix * 16);\n }\n } else {\n version = 0;\n kids = new Uint8Array();\n }\n let kidCount;\n if (version > 0) {\n kidCount = new Uint8Array(4);\n if (keyids!.length > 0) {\n new DataView(kidCount.buffer).setUint32(0, keyids!.length, false);\n }\n } else {\n kidCount = new Uint8Array();\n }\n const dataSize = new Uint8Array(4);\n if (data && data.byteLength > 0) {\n new DataView(dataSize.buffer).setUint32(0, data.byteLength, false);\n }\n return mp4Box(\n [112, 115, 115, 104],\n new Uint8Array([\n version,\n 0x00,\n 0x00,\n 0x00, // Flags\n ]),\n systemId, // 16 bytes\n kidCount,\n kids,\n dataSize,\n data || new Uint8Array()\n );\n}\n\nexport function parsePssh(initData: ArrayBuffer) {\n if (!(initData instanceof ArrayBuffer) || initData.byteLength < 32) {\n return null;\n }\n const result = {\n version: 0,\n systemId: '',\n kids: null as null | Uint8Array[],\n data: null as null | Uint8Array,\n };\n const view = new DataView(initData);\n const boxSize = view.getUint32(0);\n if (initData.byteLength !== boxSize && boxSize > 44) {\n return null;\n }\n const type = view.getUint32(4);\n if (type !== 0x70737368) {\n return null;\n }\n result.version = view.getUint32(8) >>> 24;\n if (result.version > 1) {\n return null;\n }\n result.systemId = Hex.hexDump(new Uint8Array(initData, 12, 16));\n const dataSizeOrKidCount = view.getUint32(28);\n if (result.version === 0) {\n if (boxSize - 32 < dataSizeOrKidCount) {\n return null;\n }\n result.data = new Uint8Array(initData, 32, dataSizeOrKidCount);\n } else if (result.version === 1) {\n result.kids = [];\n for (let i = 0; i < dataSizeOrKidCount; i++) {\n result.kids.push(new Uint8Array(initData, 32 + i * 16, 16));\n }\n }\n return result;\n}\n","import AESCrypto from './aes-crypto';\nimport FastAESKey from './fast-aes-key';\nimport AESDecryptor, { removePadding } from './aes-decryptor';\nimport { logger } from '../utils/logger';\nimport { appendUint8Array } from '../utils/mp4-tools';\nimport { sliceUint8 } from '../utils/typed-array';\nimport type { HlsConfig } from '../config';\n\nconst CHUNK_SIZE = 16; // 16 bytes, 128 bits\n\nexport default class Decrypter {\n private logEnabled: boolean = true;\n private removePKCS7Padding: boolean;\n private subtle: SubtleCrypto | null = null;\n private softwareDecrypter: AESDecryptor | null = null;\n private key: ArrayBuffer | null = null;\n private fastAesKey: FastAESKey | null = null;\n private remainderData: Uint8Array | null = null;\n private currentIV: ArrayBuffer | null = null;\n private currentResult: ArrayBuffer | null = null;\n private useSoftware: boolean;\n\n constructor(config: HlsConfig, { removePKCS7Padding = true } = {}) {\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 =\n browserCrypto.subtle ||\n ((browserCrypto as any).webkitSubtle as SubtleCrypto);\n }\n } catch (e) {\n /* no-op */\n }\n }\n if (this.subtle === null) {\n this.useSoftware = true;\n }\n }\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\n public isSync() {\n return this.useSoftware;\n }\n\n public flush(): Uint8Array | null {\n const { currentResult, remainderData } = 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\n public reset() {\n this.currentResult = null;\n this.currentIV = null;\n this.remainderData = null;\n if (this.softwareDecrypter) {\n this.softwareDecrypter = null;\n }\n }\n\n public decrypt(\n data: Uint8Array | ArrayBuffer,\n key: ArrayBuffer,\n iv: ArrayBuffer\n ): Promise<ArrayBuffer> {\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 public softwareDecrypt(\n data: Uint8Array,\n key: ArrayBuffer,\n iv: ArrayBuffer\n ): ArrayBuffer | null {\n const { currentIV, currentResult, remainderData } = 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\n if (currentIV) {\n iv = currentIV;\n }\n\n let softwareDecrypter = this.softwareDecrypter;\n if (!softwareDecrypter) {\n softwareDecrypter = this.softwareDecrypter = new AESDecryptor();\n }\n softwareDecrypter.expandKey(key);\n\n const result = currentResult;\n\n this.currentResult = softwareDecrypter.decrypt(currentChunk.buffer, 0, iv);\n this.currentIV = sliceUint8(currentChunk, -16).buffer;\n\n if (!result) {\n return null;\n }\n return result;\n }\n\n public webCryptoDecrypt(\n data: Uint8Array,\n key: ArrayBuffer,\n iv: ArrayBuffer\n ): Promise<ArrayBuffer> {\n const subtle = this.subtle;\n if (this.key !== key || !this.fastAesKey) {\n this.key = key;\n this.fastAesKey = new FastAESKey(subtle, key);\n }\n return this.fastAesKey\n .expandKey()\n .then((aesKey) => {\n // decrypt using web crypto\n if (!subtle) {\n return Promise.reject(new Error('web crypto not initialized'));\n }\n this.logOnce('WebCrypto AES decrypt');\n const crypto = new AESCrypto(subtle, new Uint8Array(iv));\n return crypto.decrypt(data.buffer, aesKey);\n })\n .catch((err) => {\n logger.warn(\n `[decrypter]: WebCrypto Error, disable WebCrypto API, ${err.name}: ${err.message}`\n );\n\n return this.onWebCryptoError(data, key, iv);\n });\n }\n\n private onWebCryptoError(data, key, iv): ArrayBuffer | never {\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\n private getValidChunk(data: Uint8Array): Uint8Array {\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\n private logOnce(msg: string) {\n if (!this.logEnabled) {\n return;\n }\n logger.log(`[decrypter]: ${msg}`);\n this.logEnabled = false;\n }\n}\n","import type { RationalTimestamp } from '../utils/timescale-conversion';\n\nexport interface Demuxer {\n demux(\n data: Uint8Array,\n timeOffset: number,\n isSampleAes?: boolean,\n flush?: boolean\n ): DemuxerResult;\n demuxSampleAes(\n data: Uint8Array,\n keyData: KeyData,\n timeOffset: number\n ): Promise<DemuxerResult>;\n flush(timeOffset?: number): DemuxerResult | Promise<DemuxerResult>;\n destroy(): void;\n resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number\n );\n resetTimeStamp(defaultInitPTS?: RationalTimestamp | null): void;\n resetContiguity(): void;\n}\n\nexport interface DemuxerResult {\n audioTrack: DemuxedAudioTrack;\n videoTrack: DemuxedVideoTrack;\n id3Track: DemuxedMetadataTrack;\n textTrack: DemuxedUserdataTrack;\n}\n\nexport interface DemuxedTrack {\n type: string;\n id: number;\n pid: number;\n inputTimeScale: number;\n sequenceNumber: number;\n samples:\n | AudioSample[]\n | AvcSample[]\n | MetadataSample[]\n | UserdataSample[]\n | Uint8Array;\n timescale?: number;\n container?: string;\n dropped: number;\n duration?: number;\n pesData?: ElementaryStreamData | null;\n codec?: string;\n}\n\nexport interface PassthroughTrack extends DemuxedTrack {\n sampleDuration: number;\n samples: Uint8Array;\n timescale: number;\n duration: number;\n codec: string;\n}\nexport interface DemuxedAudioTrack extends DemuxedTrack {\n config?: number[];\n samplerate?: number;\n segmentCodec?: string;\n channelCount?: number;\n manifestCodec?: string;\n samples: AudioSample[];\n}\n\nexport interface DemuxedVideoTrack extends DemuxedTrack {\n width?: number;\n height?: number;\n pixelRatio?: [number, number];\n audFound?: boolean;\n pps?: Uint8Array[];\n sps?: Uint8Array[];\n naluState?: number;\n samples: AvcSample[] | Uint8Array;\n}\n\nexport interface DemuxedAvcTrack extends DemuxedVideoTrack {\n samples: AvcSample[];\n}\n\nexport interface DemuxedMetadataTrack extends DemuxedTrack {\n samples: MetadataSample[];\n}\n\nexport interface DemuxedUserdataTrack extends DemuxedTrack {\n samples: UserdataSample[];\n}\n\nexport const enum MetadataSchema {\n audioId3 = 'org.id3',\n dateRange = 'com.apple.quicktime.HLS',\n emsg = 'https://aomedia.org/emsg/ID3',\n}\nexport interface MetadataSample {\n pts: number;\n dts: number;\n duration: number;\n len?: number;\n data: Uint8Array;\n type: MetadataSchema;\n}\n\nexport interface UserdataSample {\n pts: number;\n bytes?: Uint8Array;\n type?: number;\n payloadType?: number;\n uuid?: string;\n userData?: string;\n userDataBytes?: Uint8Array;\n}\n\nexport interface AvcSample {\n dts: number;\n pts: number;\n key: boolean;\n frame: boolean;\n units: AvcSampleUnit[];\n debug: string;\n length: number;\n}\n\nexport interface AvcSampleUnit {\n data: Uint8Array;\n type: number;\n}\n\nexport type AudioSample = {\n unit: Uint8Array;\n pts: number;\n};\n\nexport type AudioFrame = {\n sample: AudioSample;\n length: number;\n missing: number;\n};\n\nexport interface ElementaryStreamData {\n data: Uint8Array[];\n size: number;\n}\n\nexport interface KeyData {\n method: string;\n key: Uint8Array;\n iv: Uint8Array;\n}\n","import type { DemuxedTrack } from '../types/demuxer';\n\nexport function dummyTrack(type = '', inputTimeScale = 90000): DemuxedTrack {\n return {\n type,\n id: -1,\n pid: -1,\n inputTimeScale,\n sequenceNumber: -1,\n samples: [],\n dropped: 0,\n };\n}\n","import * as ID3 from '../demux/id3';\nimport {\n DemuxerResult,\n Demuxer,\n DemuxedAudioTrack,\n AudioFrame,\n DemuxedMetadataTrack,\n DemuxedVideoTrack,\n DemuxedUserdataTrack,\n KeyData,\n MetadataSchema,\n} from '../types/demuxer';\nimport { dummyTrack } from './dummy-demuxed-track';\nimport { appendUint8Array } from '../utils/mp4-tools';\nimport { sliceUint8 } from '../utils/typed-array';\nimport { RationalTimestamp } from '../utils/timescale-conversion';\n\nclass BaseAudioDemuxer implements Demuxer {\n protected _audioTrack!: DemuxedAudioTrack;\n protected _id3Track!: DemuxedMetadataTrack;\n protected frameIndex: number = 0;\n protected cachedData: Uint8Array | null = null;\n protected basePTS: number | null = null;\n protected initPTS: RationalTimestamp | null = null;\n protected lastPTS: number | null = null;\n\n resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number\n ) {\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\n resetTimeStamp(deaultTimestamp: RationalTimestamp | null) {\n this.initPTS = deaultTimestamp;\n this.resetContiguity();\n }\n\n resetContiguity(): void {\n this.basePTS = null;\n this.lastPTS = null;\n this.frameIndex = 0;\n }\n\n canParse(data: Uint8Array, offset: number): boolean {\n return false;\n }\n\n appendFrame(\n track: DemuxedAudioTrack,\n data: Uint8Array,\n offset: number\n ): AudioFrame | void {}\n\n // feed incoming data to the front of the parsing pipeline\n demux(data: Uint8Array, timeOffset: number): DemuxerResult {\n if (this.cachedData) {\n data = appendUint8Array(this.cachedData, data);\n this.cachedData = null;\n }\n\n let id3Data: Uint8Array | undefined = ID3.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 ? ID3.getTimeStamp(id3Data) : undefined;\n const length = data.length;\n\n if (\n this.basePTS === null ||\n (this.frameIndex === 0 && Number.isFinite(timestamp))\n ) {\n this.basePTS = initPTSFn(timestamp, timeOffset, this.initPTS);\n this.lastPTS = this.basePTS;\n }\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\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 (ID3.canParse(data, offset)) {\n // after a ID3.canParse, a call to ID3.getID3Data *should* always returns some data\n id3Data = ID3.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\n return {\n audioTrack: track,\n videoTrack: dummyTrack() as DemuxedVideoTrack,\n id3Track,\n textTrack: dummyTrack() as DemuxedUserdataTrack,\n };\n }\n\n demuxSampleAes(\n data: Uint8Array,\n keyData: KeyData,\n timeOffset: number\n ): Promise<DemuxerResult> {\n return Promise.reject(\n new Error(`[${this}] This demuxer does not support Sample-AES decryption`)\n );\n }\n\n flush(timeOffset: number): DemuxerResult {\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\n return {\n audioTrack: this._audioTrack,\n videoTrack: dummyTrack() as DemuxedVideoTrack,\n id3Track: this._id3Track,\n textTrack: dummyTrack() as DemuxedUserdataTrack,\n };\n }\n\n destroy() {}\n}\n\n/**\n * Initialize PTS\n * <p>\n * use timestamp unless it is undefined, NaN or Infinity\n * </p>\n */\nexport const initPTSFn = (\n timestamp: number | undefined,\n timeOffset: number,\n initPTS: RationalTimestamp | null\n): number => {\n if (Number.isFinite(timestamp as number)) {\n return timestamp! * 90;\n }\n const init90kHz = initPTS\n ? (initPTS.baseTime * 90000) / initPTS.timescale\n : 0;\n return timeOffset * 90000 + init90kHz;\n};\nexport default BaseAudioDemuxer;\n","/**\n * ADTS parser helper\n * @link https://wiki.multimedia.cx/index.php?title=ADTS\n */\nimport { logger } from '../utils/logger';\nimport { ErrorTypes, ErrorDetails } from '../errors';\nimport type { HlsEventEmitter } from '../events';\nimport { Events } from '../events';\nimport type {\n DemuxedAudioTrack,\n AudioFrame,\n AudioSample,\n} from '../types/demuxer';\n\ntype AudioConfig = {\n config: number[];\n samplerate: number;\n channelCount: number;\n codec: string;\n manifestCodec: string;\n};\n\ntype FrameHeader = {\n headerLength: number;\n frameLength: number;\n};\n\nexport function getAudioConfig(\n observer,\n data: Uint8Array,\n offset: number,\n audioCodec: string\n): AudioConfig | void {\n let adtsObjectType: number;\n let adtsExtensionSamplingIndex: number;\n let adtsChannelConfig: number;\n let config: number[];\n const userAgent = navigator.userAgent.toLowerCase();\n const manifestCodec = audioCodec;\n const adtsSamplingRates = [\n 96000, 88200, 64000, 48000, 44100, 32000, 24000, 22050, 16000, 12000, 11025,\n 8000, 7350,\n ];\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 observer.trigger(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: true,\n reason: `invalid ADTS sampling index:${adtsSamplingIndex}`,\n });\n return;\n }\n adtsChannelConfig = (data[offset + 2] & 0x01) << 2;\n // byte 3\n adtsChannelConfig |= (data[offset + 3] & 0xc0) >>> 6;\n logger.log(\n `manifest codec:${audioCodec}, ADTS type:${adtsObjectType}, samplingIndex:${adtsSamplingIndex}`\n );\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 (\n (audioCodec &&\n (audioCodec.indexOf('mp4a.40.29') !== -1 ||\n audioCodec.indexOf('mp4a.40.5') !== -1)) ||\n (!audioCodec && adtsSamplingIndex >= 6)\n ) {\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 (\n (audioCodec &&\n audioCodec.indexOf('mp4a.40.2') !== -1 &&\n ((adtsSamplingIndex >= 6 && adtsChannelConfig === 1) ||\n /vivaldi/i.test(userAgent))) ||\n (!audioCodec && adtsChannelConfig === 1)\n ) {\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}\n\nexport function isHeaderPattern(data: Uint8Array, offset: number): boolean {\n return data[offset] === 0xff && (data[offset + 1] & 0xf6) === 0xf0;\n}\n\nexport function getHeaderLength(data: Uint8Array, offset: number): number {\n return data[offset + 1] & 0x01 ? 7 : 9;\n}\n\nexport function getFullFrameLength(data: Uint8Array, offset: number): number {\n return (\n ((data[offset + 3] & 0x03) << 11) |\n (data[offset + 4] << 3) |\n ((data[offset + 5] & 0xe0) >>> 5)\n );\n}\n\nexport function canGetFrameLength(data: Uint8Array, offset: number): boolean {\n return offset + 5 < data.length;\n}\n\nexport function isHeader(data: Uint8Array, offset: number): boolean {\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(data, offset);\n}\n\nexport function canParse(data: Uint8Array, offset: number): boolean {\n return (\n canGetFrameLength(data, offset) &&\n isHeaderPattern(data, offset) &&\n getFullFrameLength(data, offset) <= data.length - offset\n );\n}\n\nexport function probe(data: Uint8Array, offset: number): boolean {\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(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\n const newOffset = offset + frameLength;\n return newOffset === data.length || isHeader(data, newOffset);\n }\n return false;\n}\n\nexport function initTrackConfig(\n track: DemuxedAudioTrack,\n observer: HlsEventEmitter,\n data: Uint8Array,\n offset: number,\n audioCodec: string\n) {\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(\n `parsed codec:${track.codec}, rate:${config.samplerate}, channels:${config.channelCount}`\n );\n }\n}\n\nexport function getFrameDuration(samplerate: number): number {\n return (1024 * 90000) / samplerate;\n}\n\nexport function parseFrameHeader(\n data: Uint8Array,\n offset: number\n): FrameHeader | void {\n // The protection skip bit tells us if we have 2 bytes of CRC data at the end of the ADTS header\n const headerLength = getHeaderLength(data, offset);\n if (offset + headerLength <= data.length) {\n // retrieve frame size\n const frameLength = getFullFrameLength(data, offset) - headerLength;\n if (frameLength > 0) {\n // logger.log(`AAC frame, offset/length/total/pts:${offset+headerLength}/${frameLength}/${data.byteLength}`);\n return { headerLength, frameLength };\n }\n }\n}\n\nexport function appendFrame(\n track: DemuxedAudioTrack,\n data: Uint8Array,\n offset: number,\n pts: number,\n frameIndex: number\n): AudioFrame {\n const frameDuration = getFrameDuration(track.samplerate as number);\n const stamp = pts + frameIndex * frameDuration;\n const header = parseFrameHeader(data, offset);\n let unit: Uint8Array;\n if (header) {\n const { frameLength, headerLength } = 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\n const sample: AudioSample = {\n unit,\n pts: stamp,\n };\n if (!missing) {\n track.samples.push(sample as AudioSample);\n }\n\n return { sample, length, missing };\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: AudioSample = {\n unit,\n pts: stamp,\n };\n return { sample, length, missing: -1 };\n}\n","/**\n * AAC demuxer\n */\nimport BaseAudioDemuxer from './base-audio-demuxer';\nimport * as ADTS from './adts';\nimport { logger } from '../utils/logger';\nimport * as ID3 from '../demux/id3';\nimport type { HlsEventEmitter } from '../events';\nimport type { HlsConfig } from '../config';\n\nclass AACDemuxer extends BaseAudioDemuxer {\n private readonly observer: HlsEventEmitter;\n private readonly config: HlsConfig;\n\n constructor(observer, config) {\n super();\n this.observer = observer;\n this.config = config;\n }\n\n resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number\n ) {\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): boolean {\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 = ID3.getID3Data(data, 0) || [];\n let offset = id3Data.length;\n\n for (let length = data.length; offset < length; offset++) {\n if (ADTS.probe(data, offset)) {\n logger.log('ADTS sync word found !');\n return true;\n }\n }\n return false;\n }\n\n canParse(data, offset) {\n return ADTS.canParse(data, offset);\n }\n\n appendFrame(track, data, offset) {\n ADTS.initTrackConfig(\n track,\n this.observer,\n data,\n offset,\n track.manifestCodec\n );\n const frame = ADTS.appendFrame(\n track,\n data,\n offset,\n this.basePTS as number,\n this.frameIndex\n );\n if (frame && frame.missing === 0) {\n return frame;\n }\n }\n}\n\nexport default AACDemuxer;\n","/**\n * MP4 demuxer\n */\nimport {\n Demuxer,\n DemuxerResult,\n PassthroughTrack,\n DemuxedAudioTrack,\n DemuxedUserdataTrack,\n DemuxedMetadataTrack,\n KeyData,\n MetadataSchema,\n} from '../types/demuxer';\nimport {\n findBox,\n segmentValidRange,\n appendUint8Array,\n parseEmsg,\n parseSamples,\n parseInitSegment,\n RemuxerTrackIdConfig,\n} from '../utils/mp4-tools';\nimport { dummyTrack } from './dummy-demuxed-track';\nimport type { HlsEventEmitter } from '../events';\nimport type { HlsConfig } from '../config';\n\nconst emsgSchemePattern = /\\/emsg[-/]ID3/i;\n\nclass MP4Demuxer implements Demuxer {\n private remainderData: Uint8Array | null = null;\n private timeOffset: number = 0;\n private config: HlsConfig;\n private videoTrack?: PassthroughTrack;\n private audioTrack?: DemuxedAudioTrack;\n private id3Track?: DemuxedMetadataTrack;\n private txtTrack?: DemuxedUserdataTrack;\n\n constructor(observer: HlsEventEmitter, config: HlsConfig) {\n this.config = config;\n }\n\n public resetTimeStamp() {}\n\n public resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number\n ) {\n const videoTrack = (this.videoTrack = dummyTrack(\n 'video',\n 1\n ) as PassthroughTrack);\n const audioTrack = (this.audioTrack = dummyTrack(\n 'audio',\n 1\n ) as DemuxedAudioTrack);\n const captionTrack = (this.txtTrack = dummyTrack(\n 'text',\n 1\n ) as DemuxedUserdataTrack);\n\n this.id3Track = dummyTrack('id3', 1) as DemuxedMetadataTrack;\n this.timeOffset = 0;\n\n if (!initSegment?.byteLength) {\n return;\n }\n const initData = parseInitSegment(initSegment);\n\n if (initData.video) {\n const { id, timescale, codec } = initData.video;\n videoTrack.id = id;\n videoTrack.timescale = captionTrack.timescale = timescale;\n videoTrack.codec = codec;\n }\n\n if (initData.audio) {\n const { id, timescale, codec } = initData.audio;\n audioTrack.id = id;\n audioTrack.timescale = timescale;\n audioTrack.codec = codec;\n }\n\n captionTrack.id = RemuxerTrackIdConfig.text;\n videoTrack.sampleDuration = 0;\n videoTrack.duration = audioTrack.duration = trackDuration;\n }\n\n public resetContiguity(): void {\n this.remainderData = null;\n }\n\n static probe(data: Uint8Array) {\n // ensure we find a moof box in the first 16 kB\n data = data.length > 16384 ? data.subarray(0, 16384) : data;\n return findBox(data, ['moof']).length > 0;\n }\n\n public demux(data: Uint8Array, timeOffset: number): DemuxerResult {\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 as PassthroughTrack;\n const textTrack = this.txtTrack as DemuxedUserdataTrack;\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\n const id3Track = this.extractID3Track(videoTrack, timeOffset);\n textTrack.samples = parseSamples(timeOffset, videoTrack);\n\n return {\n videoTrack,\n audioTrack: this.audioTrack as DemuxedAudioTrack,\n id3Track,\n textTrack: this.txtTrack as DemuxedUserdataTrack,\n };\n }\n\n public flush() {\n const timeOffset = this.timeOffset;\n const videoTrack = this.videoTrack as PassthroughTrack;\n const textTrack = this.txtTrack as DemuxedUserdataTrack;\n videoTrack.samples = this.remainderData || new Uint8Array();\n this.remainderData = null;\n\n const id3Track = this.extractID3Track(videoTrack, this.timeOffset);\n textTrack.samples = parseSamples(timeOffset, videoTrack);\n\n return {\n videoTrack,\n audioTrack: dummyTrack() as DemuxedAudioTrack,\n id3Track,\n textTrack: dummyTrack() as DemuxedUserdataTrack,\n };\n }\n\n private extractID3Track(\n videoTrack: PassthroughTrack,\n timeOffset: number\n ): DemuxedMetadataTrack {\n const id3Track = this.id3Track as DemuxedMetadataTrack;\n if (videoTrack.samples.length) {\n const emsgs = findBox(videoTrack.samples, ['emsg']);\n if (emsgs) {\n emsgs.forEach((data: Uint8Array) => {\n const emsgInfo = parseEmsg(data);\n if (emsgSchemePattern.test(emsgInfo.schemeIdUri)) {\n const pts = Number.isFinite(emsgInfo.presentationTime)\n ? emsgInfo.presentationTime! / emsgInfo.timeScale\n : timeOffset +\n emsgInfo.presentationTimeDelta! / emsgInfo.timeScale;\n let duration =\n emsgInfo.eventDuration === 0xffffffff\n ? Number.POSITIVE_INFINITY\n : 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\n demuxSampleAes(\n data: Uint8Array,\n keyData: KeyData,\n timeOffset: number\n ): Promise<DemuxerResult> {\n return Promise.reject(\n new Error('The MP4 demuxer does not support SAMPLE-AES decryption')\n );\n }\n\n destroy() {}\n}\n\nexport default MP4Demuxer;\n","/**\n * MPEG parser helper\n */\nimport { DemuxedAudioTrack } from '../types/demuxer';\n\nlet chromeVersion: number | null = null;\n\nconst BitratesMap = [\n 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448, 32, 48, 56,\n 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384, 32, 40, 48, 56, 64, 80,\n 96, 112, 128, 160, 192, 224, 256, 320, 32, 48, 56, 64, 80, 96, 112, 128, 144,\n 160, 176, 192, 224, 256, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144,\n 160,\n];\n\nconst SamplingRateMap = [\n 44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000,\n];\n\nconst SamplesCoefficients = [\n // MPEG 2.5\n [\n 0, // Reserved\n 72, // Layer3\n 144, // Layer2\n 12, // Layer1\n ],\n // Reserved\n [\n 0, // Reserved\n 0, // Layer3\n 0, // Layer2\n 0, // Layer1\n ],\n // MPEG 2\n [\n 0, // Reserved\n 72, // Layer3\n 144, // Layer2\n 12, // Layer1\n ],\n // MPEG 1\n [\n 0, // Reserved\n 144, // Layer3\n 144, // Layer2\n 12, // Layer1\n ],\n];\n\nconst BytesInSlot = [\n 0, // Reserved\n 1, // Layer3\n 1, // Layer2\n 4, // Layer1\n];\n\nexport function appendFrame(\n track: DemuxedAudioTrack,\n data: Uint8Array,\n offset: number,\n pts: number,\n frameIndex: number\n) {\n // Using http://www.datavoyage.com/mpgscript/mpeghdr.htm as a reference\n if (offset + 24 > data.length) {\n return;\n }\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\n track.config = [];\n track.channelCount = header.channelCount;\n track.samplerate = header.sampleRate;\n track.samples.push(sample);\n\n return { sample, length: header.frameLength, missing: 0 };\n }\n}\n\nexport function parseHeader(data: Uint8Array, offset: number) {\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 (\n mpegVersion !== 1 &&\n bitRateIndex !== 0 &&\n bitRateIndex !== 15 &&\n sampleRateIndex !== 3\n ) {\n const paddingBit = (data[offset + 2] >> 1) & 1;\n const channelMode = data[offset + 3] >> 6;\n const columnInBitrates =\n mpegVersion === 3 ? 3 - mpegLayer : mpegLayer === 3 ? 3 : 4;\n const bitRate =\n BitratesMap[columnInBitrates * 14 + bitRateIndex - 1] * 1000;\n const columnInSampleRates =\n mpegVersion === 3 ? 0 : mpegVersion === 2 ? 1 : 2;\n const sampleRate =\n 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 =\n Math.floor((sampleCoefficient * bitRate) / sampleRate + paddingBit) *\n bytesInSlot;\n\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 const needChromeFix = !!chromeVersion && chromeVersion <= 87;\n\n if (\n needChromeFix &&\n mpegLayer === 2 &&\n bitRate >= 224000 &&\n channelMode === 0\n ) {\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\n return { sampleRate, channelCount, frameLength, samplesPerFrame };\n }\n}\n\nexport function isHeaderPattern(data: Uint8Array, offset: number): boolean {\n return (\n data[offset] === 0xff &&\n (data[offset + 1] & 0xe0) === 0xe0 &&\n (data[offset + 1] & 0x06) !== 0x00\n );\n}\n\nexport function isHeader(data: Uint8Array, offset: number): boolean {\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}\n\nexport function canParse(data: Uint8Array, offset: number): boolean {\n const headerSize = 4;\n\n return isHeaderPattern(data, offset) && headerSize <= data.length - offset;\n}\n\nexport function probe(data: Uint8Array, offset: number): boolean {\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?.frameLength) {\n frameLength = header.frameLength;\n }\n\n const newOffset = offset + frameLength;\n return newOffset === data.length || isHeader(data, newOffset);\n }\n return false;\n}\n","/**\n * Parser for exponential Golomb codes, a variable-bitwidth number encoding scheme used by h264.\n */\n\nimport { logger } from '../utils/logger';\n\nclass ExpGolomb {\n private data: Uint8Array;\n public bytesAvailable: number;\n private word: number;\n private bitsAvailable: number;\n\n constructor(data: Uint8Array) {\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(): void {\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\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: number): void {\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: number): number {\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\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\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(): number {\n let leadingZeroCount; // :uint\n for (\n leadingZeroCount = 0;\n leadingZeroCount < this.bitsAvailable;\n ++leadingZeroCount\n ) {\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(): void {\n this.skipBits(1 + this.skipLZ());\n }\n\n // ():void\n skipEG(): void {\n this.skipBits(1 + this.skipLZ());\n }\n\n // ():uint\n readUEG(): number {\n const clz = this.skipLZ(); // :uint\n return this.readBits(clz + 1) - 1;\n }\n\n // ():int\n readEG(): number {\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(): boolean {\n return this.readBits(1) === 1;\n }\n\n // ():int\n readUByte(): number {\n return this.readBits(8);\n }\n\n // ():int\n readUShort(): number {\n return this.readBits(16);\n }\n\n // ():int\n readUInt(): number {\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: number): void {\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 width: number;\n height: number;\n pixelRatio: [number, number];\n } {\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\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 (\n profileIdc === 100 ||\n profileIdc === 110 ||\n profileIdc === 122 ||\n profileIdc === 244 ||\n profileIdc === 44 ||\n profileIdc === 83 ||\n profileIdc === 86 ||\n profileIdc === 118 ||\n profileIdc === 128\n ) {\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: [number, number] = [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 pixelRatio = [\n (readUByte() << 8) | readUByte(),\n (readUByte() << 8) | readUByte(),\n ];\n break;\n }\n }\n }\n }\n return {\n width: Math.ceil(\n (picWidthInMbsMinus1 + 1) * 16 -\n frameCropLeftOffset * 2 -\n frameCropRightOffset * 2\n ),\n height:\n (2 - frameMbsOnlyFlag) * (picHeightInMapUnitsMinus1 + 1) * 16 -\n (frameMbsOnlyFlag ? 2 : 4) *\n (frameCropTopOffset + frameCropBottomOffset),\n pixelRatio: pixelRatio,\n };\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\nexport default ExpGolomb;\n","/**\n * SAMPLE-AES decrypter\n */\n\nimport { HlsConfig } from '../config';\nimport Decrypter from '../crypt/decrypter';\nimport { HlsEventEmitter } from '../events';\nimport type {\n AudioSample,\n AvcSample,\n AvcSampleUnit,\n DemuxedVideoTrack,\n KeyData,\n} from '../types/demuxer';\nimport { discardEPB } from '../utils/mp4-tools';\n\nclass SampleAesDecrypter {\n private keyData: KeyData;\n private decrypter: Decrypter;\n\n constructor(observer: HlsEventEmitter, config: HlsConfig, keyData: KeyData) {\n this.keyData = keyData;\n this.decrypter = new Decrypter(config, {\n removePKCS7Padding: false,\n });\n }\n\n decryptBuffer(encryptedData: Uint8Array | ArrayBuffer): Promise<ArrayBuffer> {\n return this.decrypter.decrypt(\n encryptedData,\n this.keyData.key.buffer,\n this.keyData.iv.buffer\n );\n }\n\n // AAC - encrypt all full 16 bytes blocks starting from offset 16\n private decryptAacSample(\n samples: AudioSample[],\n sampleIndex: number,\n callback: () => void\n ) {\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(\n 16,\n curUnit.length - (curUnit.length % 16)\n );\n const encryptedBuffer = encryptedData.buffer.slice(\n encryptedData.byteOffset,\n encryptedData.byteOffset + encryptedData.length\n );\n\n this.decryptBuffer(encryptedBuffer).then((decryptedBuffer: ArrayBuffer) => {\n const decryptedData = new Uint8Array(decryptedBuffer);\n curUnit.set(decryptedData, 16);\n\n if (!this.decrypter.isSync()) {\n this.decryptAacSamples(samples, sampleIndex + 1, callback);\n }\n });\n }\n\n decryptAacSamples(\n samples: AudioSample[],\n sampleIndex: number,\n callback: () => void\n ) {\n for (; ; sampleIndex++) {\n if (sampleIndex >= samples.length) {\n callback();\n return;\n }\n\n if (samples[sampleIndex].unit.length < 32) {\n continue;\n }\n\n this.decryptAacSample(samples, sampleIndex, callback);\n\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: Uint8Array) {\n const encryptedDataLen =\n Math.floor((decodedData.length - 48) / 160) * 16 + 16;\n const encryptedData = new Int8Array(encryptedDataLen);\n let outputPos = 0;\n for (\n let inputPos = 32;\n inputPos < decodedData.length - 16;\n inputPos += 160, outputPos += 16\n ) {\n encryptedData.set(\n decodedData.subarray(inputPos, inputPos + 16),\n outputPos\n );\n }\n\n return encryptedData;\n }\n\n getAvcDecryptedUnit(\n decodedData: Uint8Array,\n decryptedData: ArrayLike<number> | ArrayBuffer | SharedArrayBuffer\n ) {\n const uint8DecryptedData = new Uint8Array(decryptedData);\n let inputPos = 0;\n for (\n let outputPos = 32;\n outputPos < decodedData.length - 16;\n outputPos += 160, inputPos += 16\n ) {\n decodedData.set(\n uint8DecryptedData.subarray(inputPos, inputPos + 16),\n outputPos\n );\n }\n\n return decodedData;\n }\n\n decryptAvcSample(\n samples: AvcSample[],\n sampleIndex: number,\n unitIndex: number,\n callback: () => void,\n curUnit: AvcSampleUnit\n ) {\n const decodedData = discardEPB(curUnit.data);\n const encryptedData = this.getAvcEncryptedData(decodedData);\n\n this.decryptBuffer(encryptedData.buffer).then(\n (decryptedBuffer: ArrayBuffer) => {\n curUnit.data = this.getAvcDecryptedUnit(decodedData, decryptedBuffer);\n\n if (!this.decrypter.isSync()) {\n this.decryptAvcSamples(samples, sampleIndex, unitIndex + 1, callback);\n }\n }\n );\n }\n\n decryptAvcSamples(\n samples: DemuxedVideoTrack['samples'],\n sampleIndex: number,\n unitIndex: number,\n callback: () => void\n ) {\n if (samples instanceof Uint8Array) {\n throw new Error('Cannot decrypt samples of type Uint8Array');\n }\n\n for (; ; sampleIndex++, unitIndex = 0) {\n if (sampleIndex >= samples.length) {\n callback();\n return;\n }\n\n const curUnits = samples[sampleIndex].units;\n for (; ; unitIndex++) {\n if (unitIndex >= curUnits.length) {\n break;\n }\n\n const curUnit = curUnits[unitIndex];\n if (\n curUnit.data.length <= 48 ||\n (curUnit.type !== 1 && curUnit.type !== 5)\n ) {\n continue;\n }\n\n this.decryptAvcSample(\n samples,\n sampleIndex,\n unitIndex,\n callback,\n curUnit\n );\n\n if (!this.decrypter.isSync()) {\n return;\n }\n }\n }\n }\n}\n\nexport default SampleAesDecrypter;\n","/**\n * highly optimized TS demuxer:\n * parse PAT, PMT\n * extract PES packet from audio and video PIDs\n * extract AVC/H264 NAL units and AAC/ADTS samples from PES packet\n * trigger the remuxer upon parsing completion\n * it also tries to workaround as best as it can audio codec switch (HE-AAC to AAC and vice versa), without having to restart the MediaSource.\n * it also controls the remuxing process :\n * upon discontinuity or level switch detection, it will also notifies the remuxer so that it can reset its state.\n */\n\nimport * as ADTS from './adts';\nimport * as MpegAudio from './mpegaudio';\nimport ExpGolomb from './exp-golomb';\nimport SampleAesDecrypter from './sample-aes';\nimport { Events } from '../events';\nimport {\n appendUint8Array,\n parseSEIMessageFromNALu,\n RemuxerTrackIdConfig,\n} from '../utils/mp4-tools';\nimport { logger } from '../utils/logger';\nimport { ErrorTypes, ErrorDetails } from '../errors';\nimport type { HlsConfig } from '../config';\nimport type { HlsEventEmitter } from '../events';\nimport {\n DemuxedAvcTrack,\n DemuxedAudioTrack,\n DemuxedTrack,\n Demuxer,\n DemuxerResult,\n AvcSample,\n DemuxedMetadataTrack,\n DemuxedUserdataTrack,\n ElementaryStreamData,\n KeyData,\n MetadataSchema,\n} from '../types/demuxer';\nimport { AudioFrame } from '../types/demuxer';\n\ntype ParsedTimestamp = {\n pts?: number;\n dts?: number;\n};\n\ntype PES = ParsedTimestamp & {\n data: Uint8Array;\n len: number;\n};\n\ntype ParsedAvcSample = ParsedTimestamp & Omit<AvcSample, 'pts' | 'dts'>;\n\nexport interface TypeSupported {\n mpeg: boolean;\n mp3: boolean;\n mp4: boolean;\n}\n\nconst PACKET_LENGTH = 188;\n\nclass TSDemuxer implements Demuxer {\n private readonly observer: HlsEventEmitter;\n private readonly config: HlsConfig;\n private typeSupported: TypeSupported;\n\n private sampleAes: SampleAesDecrypter | null = null;\n private pmtParsed: boolean = false;\n private audioCodec?: string;\n private videoCodec?: string;\n private _duration: number = 0;\n private _pmtId: number = -1;\n\n private _avcTrack?: DemuxedAvcTrack;\n private _audioTrack?: DemuxedAudioTrack;\n private _id3Track?: DemuxedMetadataTrack;\n private _txtTrack?: DemuxedUserdataTrack;\n private aacOverFlow: AudioFrame | null = null;\n private avcSample: ParsedAvcSample | null = null;\n private remainderData: Uint8Array | null = null;\n\n constructor(\n observer: HlsEventEmitter,\n config: HlsConfig,\n typeSupported: TypeSupported\n ) {\n this.observer = observer;\n this.config = config;\n this.typeSupported = typeSupported;\n }\n\n static probe(data: Uint8Array) {\n const syncOffset = TSDemuxer.syncOffset(data);\n if (syncOffset > 0) {\n logger.warn(\n `MPEG2-TS detected but first sync word found @ offset ${syncOffset}`\n );\n }\n return syncOffset !== -1;\n }\n\n static syncOffset(data: Uint8Array): number {\n const length = data.length;\n let scanwindow =\n Math.min(PACKET_LENGTH * 5, data.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) {\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 =\n Math.min(\n packetStart + PACKET_LENGTH * 99,\n data.length - PACKET_LENGTH\n ) + 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 (\n foundPat &&\n tsPackets > 1 &&\n ((packetStart === 0 && tsPackets > 2) ||\n j + PACKET_LENGTH > scanwindow)\n ) {\n return packetStart;\n }\n } else if (tsPackets) {\n // Exit if sync word found, but does not contain contiguous packets (#5501)\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(\n type: 'audio' | 'video' | 'id3' | 'text',\n duration?: number\n ): DemuxedTrack {\n return {\n container:\n 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 public resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string,\n videoCodec: string,\n trackDuration: number\n ) {\n this.pmtParsed = false;\n this._pmtId = -1;\n\n this._avcTrack = TSDemuxer.createTrack('video') as DemuxedAvcTrack;\n this._audioTrack = TSDemuxer.createTrack(\n 'audio',\n trackDuration\n ) as DemuxedAudioTrack;\n this._id3Track = TSDemuxer.createTrack('id3') as DemuxedMetadataTrack;\n this._txtTrack = TSDemuxer.createTrack('text') as DemuxedUserdataTrack;\n this._audioTrack.segmentCodec = 'aac';\n\n // flush any partial content\n this.aacOverFlow = null;\n this.avcSample = null;\n this.remainderData = null;\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this._duration = trackDuration;\n }\n\n public resetTimeStamp() {}\n\n public resetContiguity(): void {\n const { _audioTrack, _avcTrack, _id3Track } = this;\n if (_audioTrack) {\n _audioTrack.pesData = null;\n }\n if (_avcTrack) {\n _avcTrack.pesData = null;\n }\n if (_id3Track) {\n _id3Track.pesData = null;\n }\n this.aacOverFlow = null;\n this.avcSample = null;\n this.remainderData = null;\n }\n\n public demux(\n data: Uint8Array,\n timeOffset: number,\n isSampleAes = false,\n flush = false\n ): DemuxerResult {\n if (!isSampleAes) {\n this.sampleAes = null;\n }\n\n let pes: PES | null;\n\n const videoTrack = this._avcTrack as DemuxedAvcTrack;\n const audioTrack = this._audioTrack as DemuxedAudioTrack;\n const id3Track = this._id3Track as DemuxedMetadataTrack;\n const textTrack = this._txtTrack as DemuxedUserdataTrack;\n\n let avcId = videoTrack.pid;\n let avcData = videoTrack.pesData;\n let audioId = audioTrack.pid;\n let id3Id = id3Track.pid;\n let audioData = audioTrack.pesData;\n let id3Data = id3Track.pesData;\n let unknownPID: number | null = null;\n let pmtParsed = this.pmtParsed;\n let pmtId = this._pmtId;\n\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\n if (len < PACKET_LENGTH && !flush) {\n this.remainderData = data;\n return {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack,\n };\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(\n data.buffer,\n len,\n data.buffer.byteLength - len\n );\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: number;\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 avcId:\n if (stt) {\n if (avcData && (pes = parsePES(avcData))) {\n this.parseAVCPES(videoTrack, textTrack, pes, false);\n }\n\n avcData = { data: [], size: 0 };\n }\n if (avcData) {\n avcData.data.push(data.subarray(offset, start + PACKET_LENGTH));\n avcData.size += start + PACKET_LENGTH - offset;\n }\n break;\n case audioId:\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 }\n }\n audioData = { data: [], size: 0 };\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 id3Id:\n if (stt) {\n if (id3Data && (pes = parsePES(id3Data))) {\n this.parseID3PES(id3Track, pes);\n }\n\n id3Data = { data: [], size: 0 };\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\n pmtId = this._pmtId = parsePAT(data, offset);\n // logger.log('PMT PID:' + this._pmtId);\n break;\n case pmtId: {\n if (stt) {\n offset += data[offset] + 1;\n }\n\n const parsedPIDs = parsePMT(\n data,\n offset,\n this.typeSupported,\n isSampleAes\n );\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 avcId = parsedPIDs.avc;\n if (avcId > 0) {\n videoTrack.pid = avcId;\n }\n\n audioId = parsedPIDs.audio;\n if (audioId > 0) {\n audioTrack.pid = audioId;\n audioTrack.segmentCodec = parsedPIDs.segmentCodec;\n }\n id3Id = parsedPIDs.id3;\n if (id3Id > 0) {\n id3Track.pid = id3Id;\n }\n\n if (unknownPID !== null && !pmtParsed) {\n logger.warn(\n `MPEG-TS PMT found at ${start} after unknown PID '${unknownPID}'. Backtracking to sync byte @${syncOffset} to parse all TS packets.`\n );\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\n if (tsPacketErrors > 0) {\n const error = new Error(\n `Found ${tsPacketErrors} TS packet/s that do not start with 0x47`\n );\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 }\n\n videoTrack.pesData = avcData;\n audioTrack.pesData = audioData;\n id3Track.pesData = id3Data;\n\n const demuxResult: DemuxerResult = {\n audioTrack,\n videoTrack,\n id3Track,\n textTrack,\n };\n\n if (flush) {\n this.extractRemainingSamples(demuxResult);\n }\n\n return demuxResult;\n }\n\n public flush(): DemuxerResult | Promise<DemuxerResult> {\n const { remainderData } = this;\n this.remainderData = null;\n let result: DemuxerResult;\n if (remainderData) {\n result = this.demux(remainderData, -1, false, true);\n } else {\n result = {\n videoTrack: this._avcTrack as DemuxedAvcTrack,\n audioTrack: this._audioTrack as DemuxedAudioTrack,\n id3Track: this._id3Track as DemuxedMetadataTrack,\n textTrack: this._txtTrack as DemuxedUserdataTrack,\n };\n }\n this.extractRemainingSamples(result);\n if (this.sampleAes) {\n return this.decrypt(result, this.sampleAes);\n }\n return result;\n }\n\n private extractRemainingSamples(demuxResult: DemuxerResult) {\n const { audioTrack, videoTrack, id3Track, textTrack } = demuxResult;\n const avcData = videoTrack.pesData;\n const audioData = audioTrack.pesData;\n const id3Data = id3Track.pesData;\n // try to parse last PES packets\n let pes: PES | null;\n if (avcData && (pes = parsePES(avcData))) {\n this.parseAVCPES(\n videoTrack as DemuxedAvcTrack,\n textTrack as DemuxedUserdataTrack,\n pes,\n true\n );\n videoTrack.pesData = null;\n } else {\n // either avcData null or PES truncated, keep it for next frag parsing\n videoTrack.pesData = avcData;\n }\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 }\n audioTrack.pesData = null;\n } else {\n if (audioData?.size) {\n logger.log(\n 'last AAC PES packet truncated,might overlap between fragments'\n );\n }\n\n // either audioData null or PES truncated, keep it for next frag parsing\n audioTrack.pesData = audioData;\n }\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\n public demuxSampleAes(\n data: Uint8Array,\n keyData: KeyData,\n timeOffset: number\n ): Promise<DemuxerResult> {\n const demuxResult = this.demux(\n data,\n timeOffset,\n true,\n !this.config.progressive\n );\n const sampleAes = (this.sampleAes = new SampleAesDecrypter(\n this.observer,\n this.config,\n keyData\n ));\n return this.decrypt(demuxResult, sampleAes);\n }\n\n private decrypt(\n demuxResult: DemuxerResult,\n sampleAes: SampleAesDecrypter\n ): Promise<DemuxerResult> {\n return new Promise((resolve) => {\n const { audioTrack, videoTrack } = 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\n public destroy() {\n this._duration = 0;\n }\n\n private parseAVCPES(\n track: DemuxedAvcTrack,\n textTrack: DemuxedUserdataTrack,\n pes: PES,\n last: boolean\n ) {\n const units = this.parseAVCNALu(track, pes.data);\n const debug = false;\n let avcSample = this.avcSample;\n let push: boolean;\n let spsfound = false;\n // free pes.data to save up some memory\n (pes as any).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 (avcSample && units.length && !track.audFound) {\n pushAccessUnit(avcSample, track);\n avcSample = this.avcSample = createAVCSample(false, pes.pts, pes.dts, '');\n }\n\n units.forEach((unit) => {\n switch (unit.type) {\n // NDR\n case 1: {\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 (\n sliceType === 2 ||\n sliceType === 4 ||\n sliceType === 7 ||\n sliceType === 9\n ) {\n iskey = true;\n }\n }\n if (iskey) {\n // if we have non-keyframe data already, that cannot belong to the same frame as a keyframe, so force a push\n if (avcSample?.frame && !avcSample.key) {\n pushAccessUnit(avcSample, track);\n avcSample = this.avcSample = null;\n }\n }\n if (!avcSample) {\n avcSample = this.avcSample = createAVCSample(\n true,\n pes.pts,\n pes.dts,\n ''\n );\n }\n\n if (debug) {\n avcSample.debug += 'NDR ';\n }\n\n avcSample.frame = true;\n avcSample.key = iskey;\n break;\n // IDR\n }\n case 5:\n push = true;\n // handle PES not starting with AUD\n // if we have non-keyframe data already, that cannot belong to the same frame as a keyframe, so force a push\n if (avcSample?.frame && !avcSample.key) {\n pushAccessUnit(avcSample, track);\n avcSample = this.avcSample = null;\n }\n if (!avcSample) {\n avcSample = this.avcSample = createAVCSample(\n true,\n pes.pts,\n pes.dts,\n ''\n );\n }\n\n if (debug) {\n avcSample.debug += 'IDR ';\n }\n\n avcSample.key = true;\n avcSample.frame = true;\n break;\n // SEI\n case 6: {\n push = true;\n if (debug && avcSample) {\n avcSample.debug += 'SEI ';\n }\n parseSEIMessageFromNALu(\n unit.data,\n 1,\n pes.pts as number,\n textTrack.samples\n );\n break;\n // SPS\n }\n case 7:\n push = true;\n spsfound = true;\n if (debug && avcSample) {\n avcSample.debug += 'SPS ';\n }\n\n if (!track.sps) {\n const sps = unit.data;\n const expGolombDecoder = new ExpGolomb(sps);\n const config = expGolombDecoder.readSPS();\n track.width = config.width;\n track.height = config.height;\n track.pixelRatio = config.pixelRatio;\n track.sps = [sps];\n track.duration = this._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\n codecstring += h;\n }\n track.codec = codecstring;\n }\n break;\n // PPS\n case 8:\n push = true;\n if (debug && avcSample) {\n avcSample.debug += 'PPS ';\n }\n\n if (!track.pps) {\n track.pps = [unit.data];\n }\n\n break;\n // AUD\n case 9:\n push = false;\n track.audFound = true;\n if (avcSample) {\n pushAccessUnit(avcSample, track);\n }\n\n avcSample = this.avcSample = createAVCSample(\n false,\n pes.pts,\n pes.dts,\n debug ? 'AUD ' : ''\n );\n break;\n // Filler Data\n case 12:\n push = true;\n break;\n default:\n push = false;\n if (avcSample) {\n avcSample.debug += 'unknown NAL ' + unit.type + ' ';\n }\n\n break;\n }\n if (avcSample && push) {\n const units = avcSample.units;\n units.push(unit);\n }\n });\n // if last PES packet, push samples\n if (last && avcSample) {\n pushAccessUnit(avcSample, track);\n this.avcSample = null;\n }\n }\n\n private getLastNalUnit(samples: AvcSample[]) {\n let avcSample = this.avcSample;\n let lastUnit;\n // try to fallback to previous sample if current one is empty\n if (!avcSample || avcSample.units.length === 0) {\n avcSample = samples[samples.length - 1];\n }\n if (avcSample?.units) {\n const units = avcSample.units;\n lastUnit = units[units.length - 1];\n }\n return lastUnit;\n }\n\n private parseAVCNALu(\n track: DemuxedAvcTrack,\n array: Uint8Array\n ): Array<{\n data: Uint8Array;\n type: number;\n state?: number;\n }> {\n const len = array.byteLength;\n let state = track.naluState || 0;\n const lastState = state;\n const units = [] as Array<{\n data: Uint8Array;\n type: number;\n state?: number;\n }>;\n let i = 0;\n let value;\n let overflow;\n let unitType;\n let lastUnitStart = -1;\n let lastUnitType: number = 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\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 if (lastUnitStart >= 0) {\n const unit = {\n data: array.subarray(lastUnitStart, i - state - 1),\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(\n 0,\n lastUnit.data.byteLength - lastState\n );\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 overflow = i - state - 1;\n if (overflow > 0) {\n // logger.log('first NALU found with overflow:' + overflow);\n const tmp = new Uint8Array(lastUnit.data.byteLength + overflow);\n tmp.set(lastUnit.data, 0);\n tmp.set(array.subarray(0, overflow), lastUnit.data.byteLength);\n lastUnit.data = tmp;\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 const tmp = new Uint8Array(lastUnit.data.byteLength + array.byteLength);\n tmp.set(lastUnit.data, 0);\n tmp.set(array, lastUnit.data.byteLength);\n lastUnit.data = tmp;\n }\n }\n track.naluState = state;\n return units;\n }\n\n private parseAACPES(track: DemuxedAudioTrack, pes: 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 ${sampleLength} bytes to beginning of new PES`);\n if (frameMissingBytes === -1) {\n const tmp = new Uint8Array(sampleLength + data.byteLength);\n tmp.set(aacOverFlow.sample.unit, 0);\n tmp.set(data, sampleLength);\n data = tmp;\n } else {\n const frameOverflowBytes = sampleLength - frameMissingBytes;\n aacOverFlow.sample.unit.set(\n data.subarray(0, frameMissingBytes),\n frameOverflowBytes\n );\n track.samples.push(aacOverFlow.sample);\n startOffset = aacOverFlow.missing;\n }\n }\n // look for ADTS header (0xFFFx)\n let offset: number;\n let len: number;\n for (offset = startOffset, len = data.length; offset < len - 1; offset++) {\n if (ADTS.isHeader(data, offset)) {\n break;\n }\n }\n // if ADTS header does not start straight from the beginning of the PES payload, raise an error\n if (offset !== startOffset) {\n let reason: string;\n const recoverable = offset < len - 1;\n if (recoverable) {\n reason = `AAC PES did not start with ADTS header,offset:${offset}`;\n } else {\n reason = 'No ADTS header found in AAC PES';\n }\n const error = new Error(reason);\n logger.warn(`parsing error: ${reason}`);\n this.observer.emit(Events.ERROR, Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n fatal: false,\n levelRetry: recoverable,\n error,\n reason,\n });\n if (!recoverable) {\n return;\n }\n }\n\n ADTS.initTrackConfig(\n track,\n this.observer,\n data,\n offset,\n this.audioCodec as string\n );\n\n let pts: number;\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 = ADTS.getFrameDuration(track.samplerate as number);\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 = ADTS.appendFrame(track, data, offset, pts, frameIndex);\n offset += frame.length;\n if (!frame.missing) {\n frameIndex++;\n for (; offset < len - 1; offset++) {\n if (ADTS.isHeader(data, offset)) {\n break;\n }\n }\n } else {\n this.aacOverFlow = frame;\n break;\n }\n }\n }\n\n private parseMPEGPES(track: DemuxedAudioTrack, pes: 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\n while (offset < length) {\n if (MpegAudio.isHeader(data, offset)) {\n const frame = MpegAudio.appendFrame(\n track,\n data,\n offset,\n pts,\n frameIndex\n );\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\n private parseID3PES(id3Track: DemuxedMetadataTrack, pes: PES) {\n if (pes.pts === undefined) {\n logger.warn('[tsdemuxer]: ID3 PES unknown PTS');\n return;\n }\n const id3Sample = Object.assign({}, pes as Required<PES>, {\n type: this._avcTrack ? MetadataSchema.emsg : MetadataSchema.audioId3,\n duration: Number.POSITIVE_INFINITY,\n });\n id3Track.samples.push(id3Sample);\n }\n}\n\nfunction createAVCSample(\n key: boolean,\n pts: number | undefined,\n dts: number | undefined,\n debug: string\n): ParsedAvcSample {\n return {\n key,\n frame: false,\n pts,\n dts,\n units: [],\n debug,\n length: 0,\n };\n}\n\nfunction parsePID(data: Uint8Array, offset: number): number {\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}\n\nfunction parsePAT(data: Uint8Array, offset: number): number {\n // skip the PSI header and parse the first PMT entry\n return ((data[offset + 10] & 0x1f) << 8) | data[offset + 11];\n}\n\nfunction parsePMT(\n data: Uint8Array,\n offset: number,\n typeSupported: TypeSupported,\n isSampleAes: boolean\n) {\n const result = { audio: -1, avc: -1, id3: -1, segmentCodec: 'aac' };\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 =\n ((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 switch (data[offset]) {\n case 0xcf: // SAMPLE-AES AAC\n if (!isSampleAes) {\n logger.log(\n 'ADTS AAC with AES-128-CBC frame encryption found in unencrypted stream'\n );\n break;\n }\n /* falls through */\n case 0x0f: // ISO/IEC 13818-7 ADTS AAC (MPEG-2 lower bit-rate audio)\n // logger.log('AAC PID:' + pid);\n if (result.audio === -1) {\n result.audio = pid;\n }\n\n break;\n\n // Packetized metadata (ID3)\n case 0x15:\n // logger.log('ID3 PID:' + pid);\n if (result.id3 === -1) {\n result.id3 = pid;\n }\n\n break;\n\n case 0xdb: // SAMPLE-AES AVC\n if (!isSampleAes) {\n logger.log(\n 'H.264 with AES-128-CBC slice encryption found in unencrypted stream'\n );\n break;\n }\n /* falls through */\n case 0x1b: // ITU-T Rec. H.264 and ISO/IEC 14496-10 (lower bit-rate video)\n // logger.log('AVC PID:' + pid);\n if (result.avc === -1) {\n result.avc = pid;\n }\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 !== true && typeSupported.mp3 !== true) {\n logger.log('MPEG audio found, not supported in this browser');\n } else if (result.audio === -1) {\n result.audio = pid;\n result.segmentCodec = 'mp3';\n }\n break;\n\n case 0x24:\n logger.warn('Unsupported HEVC stream type found');\n break;\n\n default:\n // logger.log('unknown stream type:' + data[offset]);\n break;\n }\n // move to the next table entry\n // skip past the elementary stream descriptors, if present\n offset += (((data[offset + 3] & 0x0f) << 8) | data[offset + 4]) + 5;\n }\n return result;\n}\n\nfunction parsePES(stream: ElementaryStreamData): PES | null {\n let i = 0;\n let frag: Uint8Array;\n let pesLen: number;\n let pesHdrLen: number;\n let pesPts: number | undefined;\n let pesDts: number | undefined;\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 const newData = new Uint8Array(data[0].length + data[1].length);\n newData.set(data[0]);\n newData.set(data[1], data[0].length);\n data[0] = newData;\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\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 =\n (frag[9] & 0x0e) * 536870912 + // 1 << 29\n (frag[10] & 0xff) * 4194304 + // 1 << 22\n (frag[11] & 0xfe) * 16384 + // 1 << 14\n (frag[12] & 0xff) * 128 + // 1 << 7\n (frag[13] & 0xfe) / 2;\n\n if (pesFlags & 0x40) {\n pesDts =\n (frag[14] & 0x0e) * 536870912 + // 1 << 29\n (frag[15] & 0xff) * 4194304 + // 1 << 22\n (frag[16] & 0xfe) * 16384 + // 1 << 14\n (frag[17] & 0xff) * 128 + // 1 << 7\n (frag[18] & 0xfe) / 2;\n\n if (pesPts - pesDts > 60 * 90000) {\n logger.warn(\n `${Math.round(\n (pesPts - pesDts) / 90000\n )}s delta between PTS and DTS, align them`\n );\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 { data: pesData, pts: pesPts, dts: pesDts, len: pesLen };\n }\n return null;\n}\n\nfunction pushAccessUnit(avcSample: ParsedAvcSample, avcTrack: DemuxedAvcTrack) {\n if (avcSample.units.length && avcSample.frame) {\n // if sample does not have PTS/DTS, patch with last sample PTS/DTS\n if (avcSample.pts === undefined) {\n const samples = avcTrack.samples;\n const nbSamples = samples.length;\n if (nbSamples) {\n const lastSample = samples[nbSamples - 1];\n avcSample.pts = lastSample.pts;\n avcSample.dts = lastSample.dts;\n } else {\n // dropping samples, no timestamp found\n avcTrack.dropped++;\n return;\n }\n }\n avcTrack.samples.push(avcSample as AvcSample);\n }\n if (avcSample.debug.length) {\n logger.log(avcSample.pts + '/' + avcSample.dts + ':' + avcSample.debug);\n }\n}\n\nexport default TSDemuxer;\n","/**\n * MP3 demuxer\n */\nimport BaseAudioDemuxer from './base-audio-demuxer';\nimport * as ID3 from '../demux/id3';\nimport { logger } from '../utils/logger';\nimport * as MpegAudio from './mpegaudio';\n\nclass MP3Demuxer extends BaseAudioDemuxer {\n resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number\n ) {\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\n static probe(data): boolean {\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 = ID3.getID3Data(data, 0) || [];\n let offset = id3Data.length;\n\n for (let length = data.length; offset < length; offset++) {\n if (MpegAudio.probe(data, offset)) {\n logger.log('MPEG Audio sync word found !');\n return true;\n }\n }\n return false;\n }\n\n canParse(data, offset) {\n return MpegAudio.canParse(data, offset);\n }\n\n appendFrame(track, data, offset) {\n if (this.basePTS === null) {\n return;\n }\n return MpegAudio.appendFrame(\n track,\n data,\n offset,\n this.basePTS,\n this.frameIndex\n );\n }\n}\n\nexport default MP3Demuxer;\n","/**\n * AAC helper\n */\n\nclass AAC {\n static getSilentFrame(\n codec?: string,\n channelCount?: number\n ): Uint8Array | undefined {\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([\n 0x21, 0x00, 0x49, 0x90, 0x02, 0x19, 0x00, 0x23, 0x80,\n ]);\n } else if (channelCount === 3) {\n return new Uint8Array([\n 0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64,\n 0x00, 0x8e,\n ]);\n } else if (channelCount === 4) {\n return new Uint8Array([\n 0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64,\n 0x00, 0x80, 0x2c, 0x80, 0x08, 0x02, 0x38,\n ]);\n } else if (channelCount === 5) {\n return new Uint8Array([\n 0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64,\n 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x38,\n ]);\n } else if (channelCount === 6) {\n return new Uint8Array([\n 0x00, 0xc8, 0x00, 0x80, 0x20, 0x84, 0x01, 0x26, 0x40, 0x08, 0x64,\n 0x00, 0x82, 0x30, 0x04, 0x99, 0x00, 0x21, 0x90, 0x02, 0x00, 0xb2,\n 0x00, 0x20, 0x08, 0xe0,\n ]);\n }\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([\n 0x1, 0x40, 0x22, 0x80, 0xa3, 0x4e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0,\n 0x0, 0x1c, 0x6, 0xf1, 0xc1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5e,\n ]);\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([\n 0x1, 0x40, 0x22, 0x80, 0xa3, 0x5e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0,\n 0x0, 0x0, 0x95, 0x0, 0x6, 0xf1, 0xa1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5e,\n ]);\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([\n 0x1, 0x40, 0x22, 0x80, 0xa3, 0x5e, 0xe6, 0x80, 0xba, 0x8, 0x0, 0x0,\n 0x0, 0x0, 0x95, 0x0, 0x6, 0xf1, 0xa1, 0xa, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a, 0x5a,\n 0x5a, 0x5e,\n ]);\n }\n break;\n }\n return undefined;\n }\n}\n\nexport default AAC;\n","/**\n * Generate MP4 Box\n */\n\ntype HdlrTypes = {\n video: Uint8Array;\n audio: Uint8Array;\n};\n\nconst UINT32_MAX = Math.pow(2, 32) - 1;\n\nclass MP4 {\n public static types: Record<string, number[]>;\n private static HDLR_TYPES: HdlrTypes;\n private static STTS: Uint8Array;\n private static STSC: Uint8Array;\n private static STCO: Uint8Array;\n private static STSZ: Uint8Array;\n private static VMHD: Uint8Array;\n private static SMHD: Uint8Array;\n private static STSD: Uint8Array;\n private static FTYP: Uint8Array;\n private static DINF: Uint8Array;\n\n static init() {\n MP4.types = {\n avc1: [], // 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 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\n let i: string;\n for (i in MP4.types) {\n if (MP4.types.hasOwnProperty(i)) {\n MP4.types[i] = [\n i.charCodeAt(0),\n i.charCodeAt(1),\n i.charCodeAt(2),\n i.charCodeAt(3),\n ];\n }\n }\n\n const videoHdlr = new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00, // pre_defined\n 0x76,\n 0x69,\n 0x64,\n 0x65, // handler_type: 'vide'\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x56,\n 0x69,\n 0x64,\n 0x65,\n 0x6f,\n 0x48,\n 0x61,\n 0x6e,\n 0x64,\n 0x6c,\n 0x65,\n 0x72,\n 0x00, // name: 'VideoHandler'\n ]);\n\n const audioHdlr = new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00, // pre_defined\n 0x73,\n 0x6f,\n 0x75,\n 0x6e, // handler_type: 'soun'\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x53,\n 0x6f,\n 0x75,\n 0x6e,\n 0x64,\n 0x48,\n 0x61,\n 0x6e,\n 0x64,\n 0x6c,\n 0x65,\n 0x72,\n 0x00, // name: 'SoundHandler'\n ]);\n\n MP4.HDLR_TYPES = {\n video: videoHdlr,\n audio: audioHdlr,\n };\n\n const dref = new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x01, // entry_count\n 0x00,\n 0x00,\n 0x00,\n 0x0c, // entry_size\n 0x75,\n 0x72,\n 0x6c,\n 0x20, // 'url' type\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x01, // entry_flags\n ]);\n\n const stco = new Uint8Array([\n 0x00, // version\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00, // entry_count\n ]);\n\n MP4.STTS = MP4.STSC = MP4.STCO = stco;\n\n MP4.STSZ = new Uint8Array([\n 0x00, // version\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00, // sample_size\n 0x00,\n 0x00,\n 0x00,\n 0x00, // sample_count\n ]);\n MP4.VMHD = new Uint8Array([\n 0x00, // version\n 0x00,\n 0x00,\n 0x01, // flags\n 0x00,\n 0x00, // graphicsmode\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // opcolor\n ]);\n MP4.SMHD = new Uint8Array([\n 0x00, // version\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00, // balance\n 0x00,\n 0x00, // reserved\n ]);\n\n MP4.STSD = new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x01,\n ]); // 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\n MP4.FTYP = MP4.box(\n MP4.types.ftyp,\n majorBrand,\n minorVersion,\n majorBrand,\n avc1Brand\n );\n MP4.DINF = MP4.box(MP4.types.dinf, MP4.box(MP4.types.dref, dref));\n }\n\n static box(type, ...payload: Uint8Array[]) {\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\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\n static hdlr(type) {\n return MP4.box(MP4.types.hdlr, MP4.HDLR_TYPES[type]);\n }\n\n static mdat(data) {\n return MP4.box(MP4.types.mdat, data);\n }\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(\n MP4.types.mdhd,\n new Uint8Array([\n 0x01, // version 1\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x02, // creation_time\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x03, // modification_time\n (timescale >> 24) & 0xff,\n (timescale >> 16) & 0xff,\n (timescale >> 8) & 0xff,\n timescale & 0xff, // timescale\n upperWordDuration >> 24,\n (upperWordDuration >> 16) & 0xff,\n (upperWordDuration >> 8) & 0xff,\n upperWordDuration & 0xff,\n lowerWordDuration >> 24,\n (lowerWordDuration >> 16) & 0xff,\n (lowerWordDuration >> 8) & 0xff,\n lowerWordDuration & 0xff,\n 0x55,\n 0xc4, // 'und' language (undetermined)\n 0x00,\n 0x00,\n ])\n );\n }\n\n static mdia(track) {\n return MP4.box(\n MP4.types.mdia,\n MP4.mdhd(track.timescale, track.duration),\n MP4.hdlr(track.type),\n MP4.minf(track)\n );\n }\n\n static mfhd(sequenceNumber) {\n return MP4.box(\n MP4.types.mfhd,\n new Uint8Array([\n 0x00,\n 0x00,\n 0x00,\n 0x00, // flags\n sequenceNumber >> 24,\n (sequenceNumber >> 16) & 0xff,\n (sequenceNumber >> 8) & 0xff,\n sequenceNumber & 0xff, // sequence_number\n ])\n );\n }\n\n static minf(track) {\n if (track.type === 'audio') {\n return MP4.box(\n MP4.types.minf,\n MP4.box(MP4.types.smhd, MP4.SMHD),\n MP4.DINF,\n MP4.stbl(track)\n );\n } else {\n return MP4.box(\n MP4.types.minf,\n MP4.box(MP4.types.vmhd, MP4.VMHD),\n MP4.DINF,\n MP4.stbl(track)\n );\n }\n }\n\n static moof(sn, baseMediaDecodeTime, track) {\n return MP4.box(\n MP4.types.moof,\n MP4.mfhd(sn),\n MP4.traf(track, baseMediaDecodeTime)\n );\n }\n\n static moov(tracks) {\n let i = tracks.length;\n const boxes: Uint8Array[] = [];\n\n while (i--) {\n boxes[i] = MP4.trak(tracks[i]);\n }\n\n return MP4.box.apply(\n null,\n [MP4.types.moov, MP4.mvhd(tracks[0].timescale, tracks[0].duration)]\n .concat(boxes)\n .concat(MP4.mvex(tracks))\n );\n }\n\n static mvex(tracks) {\n let i = tracks.length;\n const boxes: Uint8Array[] = [];\n\n while (i--) {\n boxes[i] = MP4.trex(tracks[i]);\n }\n\n return MP4.box.apply(null, [MP4.types.mvex, ...boxes]);\n }\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([\n 0x01, // version 1\n 0x00,\n 0x00,\n 0x00, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x02, // creation_time\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x03, // modification_time\n (timescale >> 24) & 0xff,\n (timescale >> 16) & 0xff,\n (timescale >> 8) & 0xff,\n timescale & 0xff, // timescale\n upperWordDuration >> 24,\n (upperWordDuration >> 16) & 0xff,\n (upperWordDuration >> 8) & 0xff,\n upperWordDuration & 0xff,\n lowerWordDuration >> 24,\n (lowerWordDuration >> 16) & 0xff,\n (lowerWordDuration >> 8) & 0xff,\n lowerWordDuration & 0xff,\n 0x00,\n 0x01,\n 0x00,\n 0x00, // 1.0 rate\n 0x01,\n 0x00, // 1.0 volume\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x01,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x40,\n 0x00,\n 0x00,\n 0x00, // transformation: unity matrix\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // pre_defined\n 0xff,\n 0xff,\n 0xff,\n 0xff, // next_track_ID\n ]);\n return MP4.box(MP4.types.mvhd, bytes);\n }\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] =\n (flags.dependsOn << 4) |\n (flags.isDependedOn << 2) |\n flags.hasRedundancy;\n }\n\n return MP4.box(MP4.types.sdtp, bytes);\n }\n\n static stbl(track) {\n return MP4.box(\n MP4.types.stbl,\n MP4.stsd(track),\n MP4.box(MP4.types.stts, MP4.STTS),\n MP4.box(MP4.types.stsc, MP4.STSC),\n MP4.box(MP4.types.stsz, MP4.STSZ),\n MP4.box(MP4.types.stco, MP4.STCO)\n );\n }\n\n static avc1(track) {\n let sps: number[] = [];\n let pps: number[] = [];\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\n pps = pps.concat(Array.prototype.slice.call(data));\n }\n\n const avcc = MP4.box(\n MP4.types.avcC,\n new Uint8Array(\n [\n 0x01, // version\n sps[3], // profile\n sps[4], // profile compat\n sps[5], // level\n 0xfc | 3, // lengthSizeMinusOne, hard-coded to 4 bytes\n 0xe0 | track.sps.length, // 3bit reserved (111) + numOfSequenceParameterSets\n ]\n .concat(sps)\n .concat([\n track.pps.length, // numOfPictureParameterSets\n ])\n .concat(pps)\n )\n ); // \"PPS\"\n const width = track.width;\n const height = track.height;\n const hSpacing = track.pixelRatio[0];\n const vSpacing = track.pixelRatio[1];\n\n return MP4.box(\n MP4.types.avc1,\n new Uint8Array([\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01, // data_reference_index\n 0x00,\n 0x00, // pre_defined\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // pre_defined\n (width >> 8) & 0xff,\n width & 0xff, // width\n (height >> 8) & 0xff,\n height & 0xff, // height\n 0x00,\n 0x48,\n 0x00,\n 0x00, // horizresolution\n 0x00,\n 0x48,\n 0x00,\n 0x00, // vertresolution\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01, // frame_count\n 0x12,\n 0x64,\n 0x61,\n 0x69,\n 0x6c, // dailymotion/hls.js\n 0x79,\n 0x6d,\n 0x6f,\n 0x74,\n 0x69,\n 0x6f,\n 0x6e,\n 0x2f,\n 0x68,\n 0x6c,\n 0x73,\n 0x2e,\n 0x6a,\n 0x73,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // compressorname\n 0x00,\n 0x18, // depth = 24\n 0x11,\n 0x11,\n ]), // pre_defined = -1\n avcc,\n MP4.box(\n MP4.types.btrt,\n new Uint8Array([\n 0x00,\n 0x1c,\n 0x9c,\n 0x80, // bufferSizeDB\n 0x00,\n 0x2d,\n 0xc6,\n 0xc0, // maxBitrate\n 0x00,\n 0x2d,\n 0xc6,\n 0xc0,\n ])\n ), // avgBitrate\n MP4.box(\n MP4.types.pasp,\n new Uint8Array([\n hSpacing >> 24, // hSpacing\n (hSpacing >> 16) & 0xff,\n (hSpacing >> 8) & 0xff,\n hSpacing & 0xff,\n vSpacing >> 24, // vSpacing\n (vSpacing >> 16) & 0xff,\n (vSpacing >> 8) & 0xff,\n vSpacing & 0xff,\n ])\n )\n );\n }\n\n static esds(track) {\n const configlen = track.config.length;\n return new Uint8Array(\n [\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n\n 0x03, // descriptor_type\n 0x17 + configlen, // length\n 0x00,\n 0x01, // es_id\n 0x00, // stream_priority\n\n 0x04, // descriptor_type\n 0x0f + configlen, // length\n 0x40, // codec : mpeg4_audio\n 0x15, // stream_type\n 0x00,\n 0x00,\n 0x00, // buffer_size\n 0x00,\n 0x00,\n 0x00,\n 0x00, // maxBitrate\n 0x00,\n 0x00,\n 0x00,\n 0x00, // avgBitrate\n\n 0x05, // descriptor_type\n ]\n .concat([configlen])\n .concat(track.config)\n .concat([0x06, 0x01, 0x02])\n ); // GASpecificConfig)); // length + audio config descriptor\n }\n\n static mp4a(track) {\n const samplerate = track.samplerate;\n return MP4.box(\n MP4.types.mp4a,\n new Uint8Array([\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01, // data_reference_index\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n track.channelCount, // channelcount\n 0x00,\n 0x10, // sampleSize:16bits\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved2\n (samplerate >> 8) & 0xff,\n samplerate & 0xff, //\n 0x00,\n 0x00,\n ]),\n MP4.box(MP4.types.esds, MP4.esds(track))\n );\n }\n\n static mp3(track) {\n const samplerate = track.samplerate;\n return MP4.box(\n MP4.types['.mp3'],\n new Uint8Array([\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01, // data_reference_index\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n track.channelCount, // channelcount\n 0x00,\n 0x10, // sampleSize:16bits\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved2\n (samplerate >> 8) & 0xff,\n samplerate & 0xff, //\n 0x00,\n 0x00,\n ])\n );\n }\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\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\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(\n MP4.types.tkhd,\n new Uint8Array([\n 0x01, // version 1\n 0x00,\n 0x00,\n 0x07, // flags\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x02, // creation_time\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x03, // modification_time\n (id >> 24) & 0xff,\n (id >> 16) & 0xff,\n (id >> 8) & 0xff,\n id & 0xff, // track_ID\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n upperWordDuration >> 24,\n (upperWordDuration >> 16) & 0xff,\n (upperWordDuration >> 8) & 0xff,\n upperWordDuration & 0xff,\n lowerWordDuration >> 24,\n (lowerWordDuration >> 16) & 0xff,\n (lowerWordDuration >> 8) & 0xff,\n lowerWordDuration & 0xff,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x00, // layer\n 0x00,\n 0x00, // alternate_group\n 0x00,\n 0x00, // non-audio track volume\n 0x00,\n 0x00, // reserved\n 0x00,\n 0x01,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x01,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x00,\n 0x40,\n 0x00,\n 0x00,\n 0x00, // transformation: unity matrix\n (width >> 8) & 0xff,\n width & 0xff,\n 0x00,\n 0x00, // width\n (height >> 8) & 0xff,\n height & 0xff,\n 0x00,\n 0x00, // height\n ])\n );\n }\n\n static traf(track, baseMediaDecodeTime) {\n const sampleDependencyTable = MP4.sdtp(track);\n const id = track.id;\n const upperWordBaseMediaDecodeTime = Math.floor(\n baseMediaDecodeTime / (UINT32_MAX + 1)\n );\n const lowerWordBaseMediaDecodeTime = Math.floor(\n baseMediaDecodeTime % (UINT32_MAX + 1)\n );\n return MP4.box(\n MP4.types.traf,\n MP4.box(\n MP4.types.tfhd,\n new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n id >> 24,\n (id >> 16) & 0xff,\n (id >> 8) & 0xff,\n id & 0xff, // track_ID\n ])\n ),\n MP4.box(\n MP4.types.tfdt,\n new Uint8Array([\n 0x01, // version 1\n 0x00,\n 0x00,\n 0x00, // flags\n upperWordBaseMediaDecodeTime >> 24,\n (upperWordBaseMediaDecodeTime >> 16) & 0xff,\n (upperWordBaseMediaDecodeTime >> 8) & 0xff,\n upperWordBaseMediaDecodeTime & 0xff,\n lowerWordBaseMediaDecodeTime >> 24,\n (lowerWordBaseMediaDecodeTime >> 16) & 0xff,\n (lowerWordBaseMediaDecodeTime >> 8) & 0xff,\n lowerWordBaseMediaDecodeTime & 0xff,\n ])\n ),\n MP4.trun(\n track,\n sampleDependencyTable.length +\n 16 + // tfhd\n 20 + // tfdt\n 8 + // traf header\n 16 + // mfhd\n 8 + // moof header\n 8\n ), // mdat header\n sampleDependencyTable\n );\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\n static trex(track) {\n const id = track.id;\n return MP4.box(\n MP4.types.trex,\n new Uint8Array([\n 0x00, // version 0\n 0x00,\n 0x00,\n 0x00, // flags\n id >> 24,\n (id >> 16) & 0xff,\n (id >> 8) & 0xff,\n id & 0xff, // track_ID\n 0x00,\n 0x00,\n 0x00,\n 0x01, // default_sample_description_index\n 0x00,\n 0x00,\n 0x00,\n 0x00, // default_sample_duration\n 0x00,\n 0x00,\n 0x00,\n 0x00, // default_sample_size\n 0x00,\n 0x01,\n 0x00,\n 0x01, // default_sample_flags\n ])\n );\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(\n [\n track.type === 'video' ? 0x01 : 0x00, // version 1 for video with signed-int sample_composition_time_offset\n 0x00,\n 0x0f,\n 0x01, // flags\n (len >>> 24) & 0xff,\n (len >>> 16) & 0xff,\n (len >>> 8) & 0xff,\n len & 0xff, // sample_count\n (offset >>> 24) & 0xff,\n (offset >>> 16) & 0xff,\n (offset >>> 8) & 0xff,\n offset & 0xff, // data_offset\n ],\n 0\n );\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(\n [\n (duration >>> 24) & 0xff,\n (duration >>> 16) & 0xff,\n (duration >>> 8) & 0xff,\n duration & 0xff, // sample_duration\n (size >>> 24) & 0xff,\n (size >>> 16) & 0xff,\n (size >>> 8) & 0xff,\n size & 0xff, // sample_size\n (flags.isLeading << 2) | flags.dependsOn,\n (flags.isDependedOn << 6) |\n (flags.hasRedundancy << 4) |\n (flags.paddingValue << 1) |\n flags.isNonSync,\n flags.degradPrio & (0xf0 << 8),\n flags.degradPrio & 0x0f, // sample_flags\n (cts >>> 24) & 0xff,\n (cts >>> 16) & 0xff,\n (cts >>> 8) & 0xff,\n cts & 0xff, // sample_composition_time_offset\n ],\n 12 + 16 * i\n );\n }\n return MP4.box(MP4.types.trun, array);\n }\n\n static initSegment(tracks) {\n if (!MP4.types) {\n MP4.init();\n }\n\n const movie = MP4.moov(tracks);\n const result = new Uint8Array(MP4.FTYP.byteLength + movie.byteLength);\n result.set(MP4.FTYP);\n result.set(movie, MP4.FTYP.byteLength);\n return result;\n }\n}\n\nexport default MP4;\n","import type { LoaderConfig } from '../config';\nimport type { Fragment } from '../loader/fragment';\nimport type { Part } from '../loader/fragment';\nimport type { KeyLoaderInfo } from '../loader/key-loader';\nimport type { LevelDetails } from '../loader/level-details';\nimport type { HlsUrlParameters } from './level';\n\nexport interface LoaderContext {\n // target URL\n url: string;\n // loader response type (arraybuffer or default response type for playlist)\n responseType: string;\n // headers\n headers?: Record<string, string>;\n // start byte range offset\n rangeStart?: number;\n // end byte range offset\n rangeEnd?: number;\n // true if onProgress should report partial chunk of loaded content\n progressData?: boolean;\n}\n\nexport interface FragmentLoaderContext extends LoaderContext {\n frag: Fragment;\n part: Part | null;\n resetIV?: boolean;\n}\n\nexport interface KeyLoaderContext extends LoaderContext {\n keyInfo: KeyLoaderInfo;\n frag: Fragment;\n}\n\nexport interface LoaderConfiguration {\n // LoaderConfig policy that overrides required settings\n loadPolicy: LoaderConfig;\n /**\n * @deprecated use LoaderConfig timeoutRetry and errorRetry maxNumRetry\n */\n // Max number of load retries\n maxRetry: number;\n /**\n * @deprecated use LoaderConfig maxTimeToFirstByteMs and maxLoadTimeMs\n */\n // Timeout after which `onTimeOut` callback will be triggered\n // when loading has not finished after that delay\n timeout: number;\n /**\n * @deprecated use LoaderConfig timeoutRetry and errorRetry retryDelayMs\n */\n // Delay between an I/O error and following connection retry (ms).\n // This to avoid spamming the server\n retryDelay: number;\n /**\n * @deprecated use LoaderConfig timeoutRetry and errorRetry maxRetryDelayMs\n */\n // max connection retry delay (ms)\n maxRetryDelay: number;\n // When streaming progressively, this is the minimum chunk size required to emit a PROGRESS event\n highWaterMark?: number;\n}\n\nexport interface LoaderResponse {\n url: string;\n data?: string | ArrayBuffer | Object;\n // Errors can include HTTP status code and error message\n // Successful responses should include status code 200\n code?: number;\n text?: string;\n}\n\nexport interface LoaderStats {\n aborted: boolean;\n loaded: number;\n retry: number;\n total: number;\n chunkCount: number;\n bwEstimate: number;\n loading: HlsProgressivePerformanceTiming;\n parsing: HlsPerformanceTiming;\n buffering: HlsProgressivePerformanceTiming;\n}\n\nexport interface HlsPerformanceTiming {\n start: number;\n end: number;\n}\n\nexport interface HlsChunkPerformanceTiming extends HlsPerformanceTiming {\n executeStart: number;\n executeEnd: number;\n}\n\nexport interface HlsProgressivePerformanceTiming extends HlsPerformanceTiming {\n first: number;\n}\n\nexport type LoaderOnSuccess<T extends LoaderContext> = (\n response: LoaderResponse,\n stats: LoaderStats,\n context: T,\n networkDetails: any\n) => void;\n\nexport type LoaderOnProgress<T extends LoaderContext> = (\n stats: LoaderStats,\n context: T,\n data: string | ArrayBuffer,\n networkDetails: any\n) => void;\n\nexport type LoaderOnError<T extends LoaderContext> = (\n error: {\n // error status code\n code: number;\n // error description\n text: string;\n },\n context: T,\n networkDetails: any,\n stats: LoaderStats\n) => void;\n\nexport type LoaderOnTimeout<T extends LoaderContext> = (\n stats: LoaderStats,\n context: T,\n networkDetails: any\n) => void;\n\nexport type LoaderOnAbort<T extends LoaderContext> = (\n stats: LoaderStats,\n context: T,\n networkDetails: any\n) => void;\n\nexport interface LoaderCallbacks<T extends LoaderContext> {\n onSuccess: LoaderOnSuccess<T>;\n onError: LoaderOnError<T>;\n onTimeout: LoaderOnTimeout<T>;\n onAbort?: LoaderOnAbort<T>;\n onProgress?: LoaderOnProgress<T>;\n}\n\nexport interface Loader<T extends LoaderContext> {\n destroy(): void;\n abort(): void;\n load(\n context: LoaderContext,\n config: LoaderConfiguration,\n callbacks: LoaderCallbacks<T>\n ): void;\n /**\n * `getCacheAge()` is called by hls.js to get the duration that a given object\n * has been sitting in a cache proxy when playing live. If implemented,\n * this should return a value in seconds.\n *\n * For HTTP based loaders, this should return the contents of the \"age\" header.\n *\n * @returns time object being lodaded\n */\n getCacheAge?: () => number | null;\n getResponseHeader?: (name: string) => string | null;\n context: T;\n stats: LoaderStats;\n}\n\nexport const enum PlaylistContextType {\n MANIFEST = 'manifest',\n LEVEL = 'level',\n AUDIO_TRACK = 'audioTrack',\n SUBTITLE_TRACK = 'subtitleTrack',\n}\n\nexport const enum PlaylistLevelType {\n MAIN = 'main',\n AUDIO = 'audio',\n SUBTITLE = 'subtitle',\n}\n\nexport interface PlaylistLoaderContext extends LoaderContext {\n type: PlaylistContextType;\n // the level index to load\n level: number | null;\n // level or track id from LevelLoadingData / TrackLoadingData\n id: number | null;\n // track group id\n groupId?: string;\n // internal representation of a parsed m3u8 level playlist\n levelDetails?: LevelDetails;\n // Blocking playlist request delivery directives (or null id none were added to playlist url\n deliveryDirectives: HlsUrlParameters | null;\n}\n","const MPEG_TS_CLOCK_FREQ_HZ = 90000;\n\nexport type RationalTimestamp = {\n baseTime: number; // ticks\n timescale: number; // ticks per second\n};\n\nexport function toTimescaleFromBase(\n baseTime: number,\n destScale: number,\n srcBase: number = 1,\n round: boolean = false\n): number {\n const result = baseTime * destScale * srcBase; // equivalent to `(value * scale) / (1 / base)`\n return round ? Math.round(result) : result;\n}\n\nexport function toTimescaleFromScale(\n baseTime: number,\n destScale: number,\n srcScale: number = 1,\n round: boolean = false\n): number {\n return toTimescaleFromBase(baseTime, destScale, 1 / srcScale, round);\n}\n\nexport function toMsFromMpegTsClock(\n baseTime: number,\n round: boolean = false\n): number {\n return toTimescaleFromBase(baseTime, 1000, 1 / MPEG_TS_CLOCK_FREQ_HZ, round);\n}\n\nexport function toMpegTsClockFromTimescale(\n baseTime: number,\n srcScale: number = 1\n): number {\n return toTimescaleFromBase(baseTime, MPEG_TS_CLOCK_FREQ_HZ, 1 / srcScale);\n}\n","import AAC from './aac-helper';\nimport MP4 from './mp4-generator';\nimport type { HlsEventEmitter } from '../events';\nimport { Events } from '../events';\nimport { ErrorTypes, ErrorDetails } from '../errors';\nimport { logger } from '../utils/logger';\nimport {\n InitSegmentData,\n Remuxer,\n RemuxerResult,\n RemuxedMetadata,\n RemuxedTrack,\n RemuxedUserdata,\n} from '../types/remuxer';\nimport { PlaylistLevelType } from '../types/loader';\nimport {\n RationalTimestamp,\n toMsFromMpegTsClock,\n} from '../utils/timescale-conversion';\nimport type {\n AudioSample,\n AvcSample,\n DemuxedAudioTrack,\n DemuxedAvcTrack,\n DemuxedMetadataTrack,\n DemuxedUserdataTrack,\n} from '../types/demuxer';\nimport type { TrackSet } from '../types/track';\nimport type { SourceBufferName } from '../types/buffer';\nimport type { Fragment } from '../loader/fragment';\nimport type { HlsConfig } from '../config';\n\nconst MAX_SILENT_FRAME_DURATION = 10 * 1000; // 10 seconds\nconst AAC_SAMPLES_PER_FRAME = 1024;\nconst MPEG_AUDIO_SAMPLE_PER_FRAME = 1152;\n\nlet chromeVersion: number | null = null;\nlet safariWebkitVersion: number | null = null;\n\nexport default class MP4Remuxer implements Remuxer {\n private observer: HlsEventEmitter;\n private config: HlsConfig;\n private typeSupported: any;\n private ISGenerated: boolean = false;\n private _initPTS: RationalTimestamp | null = null;\n private _initDTS: RationalTimestamp | null = null;\n private nextAvcDts: number | null = null;\n private nextAudioPts: number | null = null;\n private videoSampleDuration: number | null = null;\n private isAudioContiguous: boolean = false;\n private isVideoContiguous: boolean = false;\n\n constructor(\n observer: HlsEventEmitter,\n config: HlsConfig,\n typeSupported,\n vendor = ''\n ) {\n this.observer = observer;\n this.config = config;\n this.typeSupported = typeSupported;\n this.ISGenerated = false;\n\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\n destroy() {}\n\n resetTimeStamp(defaultTimeStamp: RationalTimestamp | null) {\n logger.log('[mp4-remuxer]: initPTS & initDTS reset');\n this._initPTS = this._initDTS = defaultTimeStamp;\n }\n\n resetNextTimestamp() {\n logger.log('[mp4-remuxer]: reset next timestamp');\n this.isVideoContiguous = false;\n this.isAudioContiguous = false;\n }\n\n resetInitSegment() {\n logger.log('[mp4-remuxer]: ISGenerated flag reset');\n this.ISGenerated = false;\n }\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\n remux(\n audioTrack: DemuxedAudioTrack,\n videoTrack: DemuxedAvcTrack,\n id3Track: DemuxedMetadataTrack,\n textTrack: DemuxedUserdataTrack,\n timeOffset: number,\n accurateTimeOffset: boolean,\n flush: boolean,\n playlistType: PlaylistLevelType\n ): RemuxerResult {\n let video: RemuxedTrack | undefined;\n let audio: RemuxedTrack | undefined;\n let initSegment: InitSegmentData | undefined;\n let text: RemuxedUserdata | undefined;\n let id3: RemuxedMetadata | undefined;\n let independent: boolean | undefined;\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 =\n ((!hasAudio || enoughAudioSamples) &&\n (!hasVideo || enoughVideoSamples)) ||\n this.ISGenerated ||\n flush;\n\n if (canRemuxAvc) {\n if (!this.ISGenerated) {\n initSegment = this.generateIS(\n audioTrack,\n videoTrack,\n timeOffset,\n accurateTimeOffset\n );\n }\n\n const isVideoContiguous = this.isVideoContiguous;\n let firstKeyFrameIndex = -1;\n let firstKeyFramePTS;\n\n if (enoughVideoSamples) {\n firstKeyFrameIndex = findKeyframeIndex(videoTrack.samples);\n if (!isVideoContiguous && this.config.forceKeyFrameOnDiscontinuity) {\n independent = true;\n if (firstKeyFrameIndex > 0) {\n logger.warn(\n `[mp4-remuxer]: Dropped ${firstKeyFrameIndex} out of ${length} video samples due to a missing keyframe`\n );\n const startPTS = this.getVideoStartPts(videoTrack.samples);\n videoTrack.samples = videoTrack.samples.slice(firstKeyFrameIndex);\n videoTrack.dropped += firstKeyFrameIndex;\n videoTimeOffset +=\n (videoTrack.samples[0].pts - startPTS) /\n videoTrack.inputTimeScale;\n firstKeyFramePTS = videoTimeOffset;\n } else if (firstKeyFrameIndex === -1) {\n logger.warn(\n `[mp4-remuxer]: No keyframe found out of ${length} video samples`\n );\n independent = false;\n }\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 =\n 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(\n '[mp4-remuxer]: regenerate InitSegment as audio detected'\n );\n initSegment = this.generateIS(\n audioTrack,\n videoTrack,\n timeOffset,\n accurateTimeOffset\n );\n }\n audio = this.remuxAudio(\n audioTrack,\n audioTimeOffset,\n this.isAudioContiguous,\n accurateTimeOffset,\n hasVideo ||\n enoughVideoSamples ||\n playlistType === PlaylistLevelType.AUDIO\n ? videoTimeOffset\n : undefined\n );\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(\n '[mp4-remuxer]: regenerate InitSegment as video detected'\n );\n initSegment = this.generateIS(\n audioTrack,\n videoTrack,\n timeOffset,\n accurateTimeOffset\n );\n }\n video = this.remuxVideo(\n videoTrack,\n videoTimeOffset,\n isVideoContiguous,\n audioTrackLength\n );\n }\n } else if (enoughVideoSamples) {\n video = this.remuxVideo(\n videoTrack,\n videoTimeOffset,\n isVideoContiguous,\n 0\n );\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(\n id3Track,\n timeOffset,\n this._initPTS,\n this._initDTS\n );\n }\n\n if (textTrack.samples.length) {\n text = flushTextTrackUserdataCueSamples(\n textTrack,\n timeOffset,\n this._initPTS\n );\n }\n }\n\n return {\n audio,\n video,\n initSegment,\n independent,\n text,\n id3,\n };\n }\n\n generateIS(\n audioTrack: DemuxedAudioTrack,\n videoTrack: DemuxedAvcTrack,\n timeOffset: number,\n accurateTimeOffset: boolean\n ): InitSegmentData | undefined {\n const audioSamples = audioTrack.samples;\n const videoSamples = videoTrack.samples;\n const typeSupported = this.typeSupported;\n const tracks: TrackSet = {};\n const _initPTS = this._initPTS;\n let computePTSDTS = !_initPTS || accurateTimeOffset;\n let container = 'audio/mp4';\n let initPTS: number | undefined;\n let initDTS: number | undefined;\n let timescale: number | undefined;\n\n if (computePTSDTS) {\n initPTS = initDTS = Infinity;\n }\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 }\n tracks.audio = {\n id: 'audio',\n container: container,\n codec: audioTrack.codec,\n initSegment:\n audioTrack.segmentCodec === 'mp3' && typeSupported.mpeg\n ? new Uint8Array(0)\n : 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 =\n audioSamples[0].pts - Math.round(timescale * timeOffset);\n } else {\n computePTSDTS = false;\n }\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(\n initDTS as number,\n normalizePts(videoSamples[0].dts, startPTS) - startOffset\n );\n initPTS = Math.min(initPTS as number, startPTS - startOffset);\n } else {\n computePTSDTS = false;\n }\n }\n }\n\n if (Object.keys(tracks).length) {\n this.ISGenerated = true;\n if (computePTSDTS) {\n this._initPTS = {\n baseTime: initPTS as number,\n timescale: timescale as number,\n };\n this._initDTS = {\n baseTime: initDTS as number,\n timescale: timescale as number,\n };\n } else {\n initPTS = timescale = undefined;\n }\n\n return {\n tracks,\n initPTS,\n timescale,\n };\n }\n }\n\n remuxVideo(\n track: DemuxedAvcTrack,\n timeOffset: number,\n contiguous: boolean,\n audioTrackLength: number\n ): RemuxedTrack | undefined {\n const timeScale: number = track.inputTimeScale;\n const inputSamples: Array<AvcSample> = track.samples;\n const outputSamples: Array<Mp4Sample> = [];\n const nbSamples = inputSamples.length;\n const initPTS = this._initPTS as RationalTimestamp;\n let nextAvcDts = this.nextAvcDts;\n let offset = 8;\n let mp4SampleDuration = this.videoSampleDuration;\n let firstDTS;\n let lastDTS;\n let minPTS: number = Number.POSITIVE_INFINITY;\n let maxPTS: number = 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 =\n inputSamples[0].pts -\n normalizePts(inputSamples[0].dts, inputSamples[0].pts);\n // if not contiguous, let's use target timeOffset\n nextAvcDts = pts - cts;\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\n ? Math.round(inputDuration / (nbSamples - 1))\n : 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(\n `AVC: ${toMsFromMpegTsClock(\n delta,\n true\n )} ms (${delta}dts) hole between fragments detected, filling it`\n );\n } else {\n logger.warn(\n `AVC: ${toMsFromMpegTsClock(\n -delta,\n true\n )} ms (${delta}dts) overlapping between fragments detected`\n );\n }\n if (!foundOverlap || nextAvcDts >= inputSamples[0].pts) {\n firstDTS = nextAvcDts;\n const firstPTS = inputSamples[0].pts - delta;\n inputSamples[0].dts = firstDTS;\n inputSamples[0].pts = firstPTS;\n logger.log(\n `Video: First PTS/DTS adjusted: ${toMsFromMpegTsClock(\n firstPTS,\n true\n )}/${toMsFromMpegTsClock(\n firstDTS,\n true\n )}, delta: ${toMsFromMpegTsClock(delta, true)} ms`\n );\n }\n }\n }\n\n firstDTS = Math.max(0, firstDTS);\n\n let nbNalu = 0;\n let naluLen = 0;\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\n naluLen += sampleLen;\n nbNalu += nbUnits;\n sample.length = sampleLen;\n\n // ensure sample monotonic DTS\n sample.dts = Math.max(sample.dts, firstDTS);\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\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 avcSample = inputSamples[i];\n const avcSampleUnits = avcSample.units;\n let mp4SampleLength = 0;\n // convert NALU bitstream to MP4 format (prepend NALU with size field)\n for (let j = 0, nbUnits = avcSampleUnits.length; j < nbUnits; j++) {\n const unit = avcSampleUnits[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 - avcSample.dts;\n ptsDelta = inputSamples[i + 1].pts - avcSample.pts;\n } else {\n const config = this.config;\n const lastFrameDuration =\n i > 0\n ? avcSample.dts - inputSamples[i - 1].dts\n : averageSampleDuration;\n ptsDelta =\n i > 0\n ? avcSample.pts - inputSamples[i - 1].pts\n : 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 =\n (audioTrackLength\n ? minPTS + audioTrackLength * timeScale\n : this.nextAudioPts) - avcSample.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(\n `[mp4-remuxer]: It is approximately ${\n deltaToFrameEnd / 90\n } ms to the next segment; using duration ${\n mp4SampleDuration / 90\n } ms for the last video frame.`\n );\n } else {\n mp4SampleDuration = lastFrameDuration;\n }\n } else {\n mp4SampleDuration = lastFrameDuration;\n }\n }\n const compositionTimeOffset = Math.round(avcSample.pts - avcSample.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\n outputSamples.push(\n new Mp4Sample(\n avcSample.key,\n mp4SampleDuration,\n mp4SampleLength,\n compositionTimeOffset\n )\n );\n }\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 (\n maxPtsDelta - minPtsDelta < maxDtsDelta - minDtsDelta &&\n averageSampleDuration / maxDtsDelta < 0.025 &&\n outputSamples[0].cts === 0\n ) {\n logger.warn(\n 'Found irregular gaps in sample duration. Using PTS instead of DTS to determine MP4 sample duration.'\n );\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\n ? outputSamples[i - 1].duration\n : 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 =\n stretchedLastFrame || !mp4SampleDuration\n ? averageSampleDuration\n : mp4SampleDuration;\n this.nextAvcDts = nextAvcDts = lastDTS + mp4SampleDuration;\n this.videoSampleDuration = mp4SampleDuration;\n this.isVideoContiguous = true;\n const moof = MP4.moof(\n track.sequenceNumber++,\n firstDTS,\n Object.assign({}, track, {\n samples: outputSamples,\n })\n );\n const type: SourceBufferName = '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 as number) / 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\n remuxAudio(\n track: DemuxedAudioTrack,\n timeOffset: number,\n contiguous: boolean,\n accurateTimeOffset: boolean,\n videoTimeOffset?: number\n ): RemuxedTrack | undefined {\n const inputTimeScale: number = track.inputTimeScale;\n const mp4timeScale: number = track.samplerate\n ? track.samplerate\n : inputTimeScale;\n const scaleFactor: number = inputTimeScale / mp4timeScale;\n const mp4SampleDuration: number =\n track.segmentCodec === 'aac'\n ? AAC_SAMPLES_PER_FRAME\n : MPEG_AUDIO_SAMPLE_PER_FRAME;\n const inputSampleDuration: number = mp4SampleDuration * scaleFactor;\n const initPTS = this._initPTS as RationalTimestamp;\n const rawMPEG: boolean =\n track.segmentCodec === 'mp3' && this.typeSupported.mpeg;\n const outputSamples: Array<Mp4Sample> = [];\n const alignedWithVideo = videoTimeOffset !== undefined;\n\n let inputSamples: Array<AudioSample> = track.samples;\n let offset: number = rawMPEG ? 0 : 8;\n let nextAudioPts: number = 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 =\n contiguous ||\n ((inputSamples.length &&\n nextAudioPts > 0 &&\n ((accurateTimeOffset &&\n Math.abs(timeOffsetMpegTS - nextAudioPts) < 9000) ||\n Math.abs(\n normalizePts(inputSamples[0].pts - initTime, timeOffsetMpegTS) -\n nextAudioPts\n ) <\n 20 * inputSampleDuration)) as boolean);\n\n // compute normalized PTS\n inputSamples.forEach(function (sample) {\n sample.pts = normalizePts(sample.pts - initTime, timeOffsetMpegTS);\n });\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\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 (\n delta <= -maxAudioFramesDrift * inputSampleDuration &&\n alignedWithVideo\n ) {\n if (i === 0) {\n logger.warn(\n `Audio frame @ ${(pts / inputTimeScale).toFixed(\n 3\n )}s overlaps nextAudioPts by ${Math.round(\n (1000 * delta) / inputTimeScale\n )} ms.`\n );\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 (\n delta >= maxAudioFramesDrift * inputSampleDuration &&\n duration < MAX_SILENT_FRAME_DURATION &&\n alignedWithVideo\n ) {\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(\n `[mp4-remuxer]: Injecting ${missing} audio frame @ ${(\n nextPts / inputTimeScale\n ).toFixed(3)}s due to ${Math.round(\n (1000 * delta) / inputTimeScale\n )} ms gap.`\n );\n for (let j = 0; j < missing; j++) {\n const newStamp = Math.max(nextPts as number, 0);\n let fillFrame = AAC.getSilentFrame(\n track.manifestCodec || track.codec,\n track.channelCount\n );\n if (!fillFrame) {\n logger.log(\n '[mp4-remuxer]: Unable to get silent frame for given audio codec; duplicating last frame instead.'\n );\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: number | null = null;\n let lastPTS: number | null = null;\n let mdat: any;\n let mdatSize: number = 0;\n let sampleLength: number = 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 =\n lastPTS! + scaleFactor * lastSample.duration;\n\n // Set the track samples from inputSamples to outputSamples before remuxing\n const moof = rawMPEG\n ? new Uint8Array(0)\n : MP4.moof(\n track.sequenceNumber++,\n firstPTS! / scaleFactor,\n Object.assign({}, track, { 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: SourceBufferName = '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\n this.isAudioContiguous = true;\n return audioData;\n }\n\n remuxEmptyAudio(\n track: DemuxedAudioTrack,\n timeOffset: number,\n contiguous: boolean,\n videoData: Fragment\n ): RemuxedTrack | undefined {\n const inputTimeScale: number = track.inputTimeScale;\n const mp4timeScale: number = track.samplerate\n ? track.samplerate\n : inputTimeScale;\n const scaleFactor: number = inputTimeScale / mp4timeScale;\n const nextAudioPts: number | null = this.nextAudioPts;\n // sync with video's timestamp\n const initDTS = this._initDTS as RationalTimestamp;\n const init90kHz = (initDTS.baseTime * 90000) / initDTS.timescale;\n const startDTS: number =\n (nextAudioPts !== null\n ? nextAudioPts\n : videoData.startDTS * inputTimeScale) + init90kHz;\n const endDTS: number = videoData.endDTS * inputTimeScale + init90kHz;\n // one sample's duration value\n const frameDuration: number = scaleFactor * AAC_SAMPLES_PER_FRAME;\n // samples count of this segment's duration\n const nbSamples: number = Math.ceil((endDTS - startDTS) / frameDuration);\n // silent frame\n const silentFrame: Uint8Array | undefined = AAC.getSilentFrame(\n track.manifestCodec || track.codec,\n track.channelCount\n );\n\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(\n '[mp4-remuxer]: Unable to remuxEmptyAudio since we were unable to get a silent frame for given audio codec'\n );\n return;\n }\n\n const samples: Array<any> = [];\n for (let i = 0; i < nbSamples; i++) {\n const stamp = startDTS + i * frameDuration;\n samples.push({ unit: silentFrame, pts: stamp, dts: stamp });\n }\n track.samples = samples;\n\n return this.remuxAudio(track, timeOffset, contiguous, false);\n }\n}\n\nexport function normalizePts(value: number, reference: number | null): number {\n let offset;\n if (reference === null) {\n return value;\n }\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\n return value;\n}\n\nfunction findKeyframeIndex(samples: Array<AvcSample>): number {\n for (let i = 0; i < samples.length; i++) {\n if (samples[i].key) {\n return i;\n }\n }\n return -1;\n}\n\nexport function flushTextTrackMetadataCueSamples(\n track: DemuxedMetadataTrack,\n timeOffset: number,\n initPTS: RationalTimestamp,\n initDTS: RationalTimestamp\n): RemuxedMetadata | undefined {\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 =\n normalizePts(\n sample.pts - (initPTS.baseTime * inputTimeScale) / initPTS.timescale,\n timeOffset * inputTimeScale\n ) / inputTimeScale;\n sample.dts =\n normalizePts(\n sample.dts - (initDTS.baseTime * inputTimeScale) / initDTS.timescale,\n timeOffset * inputTimeScale\n ) / inputTimeScale;\n }\n const samples = track.samples;\n track.samples = [];\n return {\n samples,\n };\n}\n\nexport function flushTextTrackUserdataCueSamples(\n track: DemuxedUserdataTrack,\n timeOffset: number,\n initPTS: RationalTimestamp\n): RemuxedUserdata | undefined {\n const length = track.samples.length;\n if (!length) {\n return;\n }\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 =\n normalizePts(\n sample.pts - (initPTS.baseTime * inputTimeScale) / initPTS.timescale,\n timeOffset * inputTimeScale\n ) / 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}\n\nclass Mp4Sample {\n public size: number;\n public duration: number;\n public cts: number;\n public flags: Mp4SampleFlags;\n\n constructor(\n isKeyframe: boolean,\n duration: number,\n size: number,\n cts: number\n ) {\n this.duration = duration;\n this.size = size;\n this.cts = cts;\n this.flags = new Mp4SampleFlags(isKeyframe);\n }\n}\n\nclass Mp4SampleFlags {\n public isLeading: 0 = 0;\n public isDependedOn: 0 = 0;\n public hasRedundancy: 0 = 0;\n public degradPrio: 0 = 0;\n public dependsOn: 1 | 2 = 1;\n public isNonSync: 0 | 1 = 1;\n\n constructor(isKeyframe) {\n this.dependsOn = isKeyframe ? 2 : 1;\n this.isNonSync = isKeyframe ? 0 : 1;\n }\n}\n","import type { HlsEventEmitter } from '../events';\nimport { Events } from '../events';\nimport { ErrorTypes, ErrorDetails } from '../errors';\nimport Decrypter from '../crypt/decrypter';\nimport AACDemuxer from '../demux/aacdemuxer';\nimport MP4Demuxer from '../demux/mp4demuxer';\nimport TSDemuxer, { TypeSupported } from '../demux/tsdemuxer';\nimport MP3Demuxer from '../demux/mp3demuxer';\nimport MP4Remuxer from '../remux/mp4-remuxer';\nimport PassThroughRemuxer from '../remux/passthrough-remuxer';\nimport { logger } from '../utils/logger';\nimport type { Demuxer, DemuxerResult, KeyData } from '../types/demuxer';\nimport type { Remuxer } from '../types/remuxer';\nimport type { TransmuxerResult, ChunkMetadata } from '../types/transmuxer';\nimport type { HlsConfig } from '../config';\nimport type { DecryptData } from '../loader/level-key';\nimport type { PlaylistLevelType } from '../types/loader';\nimport type { RationalTimestamp } from '../utils/timescale-conversion';\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 = typeof self !== 'undefined' && self.Date.now;\n}\n\ntype MuxConfig =\n | { demux: typeof MP4Demuxer; remux: typeof PassThroughRemuxer }\n | { demux: typeof TSDemuxer; remux: typeof MP4Remuxer }\n | { demux: typeof AACDemuxer; remux: typeof MP4Remuxer }\n | { demux: typeof MP3Demuxer; remux: typeof MP4Remuxer };\n\nconst muxConfig: MuxConfig[] = [\n { demux: MP4Demuxer, remux: PassThroughRemuxer },\n { demux: TSDemuxer, remux: MP4Remuxer },\n { demux: AACDemuxer, remux: MP4Remuxer },\n { demux: MP3Demuxer, remux: MP4Remuxer },\n];\n\nexport default class Transmuxer {\n public async: boolean = false;\n private observer: HlsEventEmitter;\n private typeSupported: TypeSupported;\n private config: HlsConfig;\n private vendor: string;\n private id: PlaylistLevelType;\n private demuxer?: Demuxer;\n private remuxer?: Remuxer;\n private decrypter?: Decrypter;\n private probe!: Function;\n private decryptionPromise: Promise<TransmuxerResult> | null = null;\n private transmuxConfig!: TransmuxConfig;\n private currentTransmuxState!: TransmuxState;\n\n constructor(\n observer: HlsEventEmitter,\n typeSupported: TypeSupported,\n config: HlsConfig,\n vendor: string,\n id: PlaylistLevelType\n ) {\n this.observer = observer;\n this.typeSupported = typeSupported;\n this.config = config;\n this.vendor = vendor;\n this.id = id;\n }\n\n configure(transmuxConfig: TransmuxConfig) {\n this.transmuxConfig = transmuxConfig;\n if (this.decrypter) {\n this.decrypter.reset();\n }\n }\n\n push(\n data: ArrayBuffer,\n decryptdata: DecryptData | null,\n chunkMeta: ChunkMetadata,\n state?: TransmuxState\n ): TransmuxerResult | Promise<TransmuxerResult> {\n const stats = chunkMeta.transmuxing;\n stats.executeStart = now();\n\n let uintData: Uint8Array = new Uint8Array(data);\n const { currentTransmuxState, transmuxConfig } = this;\n if (state) {\n this.currentTransmuxState = state;\n }\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\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(\n uintData,\n keyData.key.buffer,\n keyData.iv.buffer\n );\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\n .webCryptoDecrypt(uintData, keyData.key.buffer, keyData.iv.buffer)\n .then((decryptedData): TransmuxerResult => {\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(\n decryptedData,\n null,\n chunkMeta\n ) as TransmuxerResult;\n this.decryptionPromise = null;\n return result;\n });\n return this.decryptionPromise!;\n }\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\n if (discontinuity || trackSwitch || initSegmentChange || resetMuxers) {\n this.resetInitSegment(\n initSegmentData,\n audioCodec,\n videoCodec,\n duration,\n decryptdata\n );\n }\n\n if (discontinuity || initSegmentChange || resetMuxers) {\n this.resetInitialTimestamp(defaultInitPts);\n }\n\n if (!contiguous) {\n this.resetContiguity();\n }\n\n const result = this.transmux(\n uintData,\n keyData,\n timeOffset,\n accurateTimeOffset,\n chunkMeta\n );\n const currentState = this.currentTransmuxState;\n\n currentState.contiguous = true;\n currentState.discontinuity = false;\n currentState.trackSwitch = false;\n\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(\n chunkMeta: ChunkMetadata\n ): TransmuxerResult[] | Promise<TransmuxerResult[]> {\n const stats = chunkMeta.transmuxing;\n stats.executeStart = now();\n\n const { decrypter, currentTransmuxState, decryptionPromise } = this;\n\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\n const transmuxResults: TransmuxerResult[] = [];\n const { timeOffset } = 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(\n this.push(decryptedData, null, chunkMeta) as TransmuxerResult\n );\n }\n }\n\n const { demuxer, remuxer } = 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\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\n this.flushRemux(transmuxResults, demuxResultOrPromise, chunkMeta);\n return transmuxResults;\n }\n\n private flushRemux(\n transmuxResults: TransmuxerResult[],\n demuxResult: DemuxerResult,\n chunkMeta: ChunkMetadata\n ) {\n const { audioTrack, videoTrack, id3Track, textTrack } = demuxResult;\n const { accurateTimeOffset, timeOffset } = this.currentTransmuxState;\n logger.log(\n `[transmuxer.ts]: Flushed fragment ${chunkMeta.sn}${\n chunkMeta.part > -1 ? ' p: ' + chunkMeta.part : ''\n } of level ${chunkMeta.level}`\n );\n const remuxResult = this.remuxer!.remux(\n audioTrack,\n videoTrack,\n id3Track,\n textTrack,\n timeOffset,\n accurateTimeOffset,\n true,\n this.id\n );\n transmuxResults.push({\n remuxResult,\n chunkMeta,\n });\n\n chunkMeta.transmuxing.executeEnd = now();\n }\n\n resetInitialTimestamp(defaultInitPts: RationalTimestamp | null) {\n const { demuxer, remuxer } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetTimeStamp(defaultInitPts);\n remuxer.resetTimeStamp(defaultInitPts);\n }\n\n resetContiguity() {\n const { demuxer, remuxer } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetContiguity();\n remuxer.resetNextTimestamp();\n }\n\n resetInitSegment(\n initSegmentData: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n trackDuration: number,\n decryptdata: DecryptData | null\n ) {\n const { demuxer, remuxer } = this;\n if (!demuxer || !remuxer) {\n return;\n }\n demuxer.resetInitSegment(\n initSegmentData,\n audioCodec,\n videoCodec,\n trackDuration\n );\n remuxer.resetInitSegment(\n initSegmentData,\n audioCodec,\n videoCodec,\n decryptdata\n );\n }\n\n destroy(): void {\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\n private transmux(\n data: Uint8Array,\n keyData: KeyData | null,\n timeOffset: number,\n accurateTimeOffset: boolean,\n chunkMeta: ChunkMetadata\n ): TransmuxerResult | Promise<TransmuxerResult> {\n let result: TransmuxerResult | Promise<TransmuxerResult>;\n if (keyData && keyData.method === 'SAMPLE-AES') {\n result = this.transmuxSampleAes(\n data,\n keyData,\n timeOffset,\n accurateTimeOffset,\n chunkMeta\n );\n } else {\n result = this.transmuxUnencrypted(\n data,\n timeOffset,\n accurateTimeOffset,\n chunkMeta\n );\n }\n return result;\n }\n\n private transmuxUnencrypted(\n data: Uint8Array,\n timeOffset: number,\n accurateTimeOffset: boolean,\n chunkMeta: ChunkMetadata\n ): TransmuxerResult {\n const { audioTrack, videoTrack, id3Track, textTrack } = (\n this.demuxer as Demuxer\n ).demux(data, timeOffset, false, !this.config.progressive);\n const remuxResult = this.remuxer!.remux(\n audioTrack,\n videoTrack,\n id3Track,\n textTrack,\n timeOffset,\n accurateTimeOffset,\n false,\n this.id\n );\n return {\n remuxResult,\n chunkMeta,\n };\n }\n\n private transmuxSampleAes(\n data: Uint8Array,\n decryptData: KeyData,\n timeOffset: number,\n accurateTimeOffset: boolean,\n chunkMeta: ChunkMetadata\n ): Promise<TransmuxerResult> {\n return (this.demuxer as Demuxer)\n .demuxSampleAes(data, decryptData, timeOffset)\n .then((demuxResult) => {\n const remuxResult = this.remuxer!.remux(\n demuxResult.audioTrack,\n demuxResult.videoTrack,\n demuxResult.id3Track,\n demuxResult.textTrack,\n timeOffset,\n accurateTimeOffset,\n false,\n this.id\n );\n return {\n remuxResult,\n chunkMeta,\n };\n });\n }\n\n private configureTransmuxer(data: Uint8Array): void | Error {\n const { config, observer, typeSupported, vendor } = this;\n // probe for content type\n let mux;\n for (let i = 0, len = muxConfig.length; i < len; i++) {\n if (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: MuxConfig['remux'] = mux.remux;\n const Demuxer: MuxConfig['demux'] = 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\n private needsProbing(discontinuity: boolean, trackSwitch: boolean): boolean {\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\n private getDecrypter(): Decrypter {\n let decrypter = this.decrypter;\n if (!decrypter) {\n decrypter = this.decrypter = new Decrypter(this.config);\n }\n return decrypter;\n }\n}\n\nfunction getEncryptionType(\n data: Uint8Array,\n decryptData: DecryptData | null\n): KeyData | null {\n let encryptionType: KeyData | null = null;\n if (\n data.byteLength > 0 &&\n decryptData != null &&\n decryptData.key != null &&\n decryptData.iv !== null &&\n decryptData.method != null\n ) {\n encryptionType = decryptData as KeyData;\n }\n return encryptionType;\n}\n\nconst emptyResult = (chunkMeta): TransmuxerResult => ({\n remuxResult: {},\n chunkMeta,\n});\n\nexport function isPromise<T>(p: Promise<T> | any): p is Promise<T> {\n return 'then' in p && p.then instanceof Function;\n}\n\nexport class TransmuxConfig {\n public audioCodec?: string;\n public videoCodec?: string;\n public initSegmentData?: Uint8Array;\n public duration: number;\n public defaultInitPts: RationalTimestamp | null;\n\n constructor(\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n initSegmentData: Uint8Array | undefined,\n duration: number,\n defaultInitPts?: RationalTimestamp\n ) {\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this.initSegmentData = initSegmentData;\n this.duration = duration;\n this.defaultInitPts = defaultInitPts || null;\n }\n}\n\nexport class TransmuxState {\n public discontinuity: boolean;\n public contiguous: boolean;\n public accurateTimeOffset: boolean;\n public trackSwitch: boolean;\n public timeOffset: number;\n public initSegmentChange: boolean;\n\n constructor(\n discontinuity: boolean,\n contiguous: boolean,\n accurateTimeOffset: boolean,\n trackSwitch: boolean,\n timeOffset: number,\n initSegmentChange: boolean\n ) {\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","import {\n flushTextTrackMetadataCueSamples,\n flushTextTrackUserdataCueSamples,\n} from './mp4-remuxer';\nimport {\n InitData,\n InitDataTrack,\n patchEncyptionData,\n} from '../utils/mp4-tools';\nimport {\n getDuration,\n getStartDTS,\n offsetStartDTS,\n parseInitSegment,\n} from '../utils/mp4-tools';\nimport { ElementaryStreamTypes } from '../loader/fragment';\nimport { logger } from '../utils/logger';\nimport type { TrackSet } from '../types/track';\nimport type {\n InitSegmentData,\n RemuxedTrack,\n Remuxer,\n RemuxerResult,\n} from '../types/remuxer';\nimport type {\n DemuxedAudioTrack,\n DemuxedMetadataTrack,\n DemuxedUserdataTrack,\n PassthroughTrack,\n} from '../types/demuxer';\nimport type { DecryptData } from '../loader/level-key';\nimport type { RationalTimestamp } from '../utils/timescale-conversion';\n\nclass PassThroughRemuxer implements Remuxer {\n private emitInitSegment: boolean = false;\n private audioCodec?: string;\n private videoCodec?: string;\n private initData?: InitData;\n private initPTS: RationalTimestamp | null = null;\n private initTracks?: TrackSet;\n private lastEndTime: number | null = null;\n\n public destroy() {}\n\n public resetTimeStamp(defaultInitPTS: RationalTimestamp | null) {\n this.initPTS = defaultInitPTS;\n this.lastEndTime = null;\n }\n\n public resetNextTimestamp() {\n this.lastEndTime = null;\n }\n\n public resetInitSegment(\n initSegment: Uint8Array | undefined,\n audioCodec: string | undefined,\n videoCodec: string | undefined,\n decryptdata: DecryptData | null\n ) {\n this.audioCodec = audioCodec;\n this.videoCodec = videoCodec;\n this.generateInitSegment(patchEncyptionData(initSegment, decryptdata));\n this.emitInitSegment = true;\n }\n\n private generateInitSegment(initSegment: Uint8Array | undefined): void {\n let { audioCodec, videoCodec } = this;\n if (!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 (!audioCodec) {\n audioCodec = getParsedTrackCodec(\n initData.audio,\n ElementaryStreamTypes.AUDIO\n );\n }\n\n if (!videoCodec) {\n videoCodec = getParsedTrackCodec(\n initData.video,\n ElementaryStreamTypes.VIDEO\n );\n }\n\n const tracks: TrackSet = {};\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(\n '[passthrough-remuxer.ts]: initSegment does not contain moov or trak boxes.'\n );\n }\n this.initTracks = tracks;\n }\n\n public remux(\n audioTrack: DemuxedAudioTrack,\n videoTrack: PassthroughTrack,\n id3Track: DemuxedMetadataTrack,\n textTrack: DemuxedUserdataTrack,\n timeOffset: number,\n accurateTimeOffset: boolean\n ): RemuxerResult {\n let { initPTS, lastEndTime } = this;\n const result: RemuxerResult = {\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 (!Number.isFinite(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?.length) {\n return result;\n }\n\n const initSegment: InitSegmentData = {\n initPTS: undefined,\n timescale: 1,\n };\n let initData = this.initData;\n if (!initData?.length) {\n this.generateInitSegment(data);\n initData = this.initData;\n }\n if (!initData?.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 as TrackSet;\n this.emitInitSegment = false;\n }\n\n const duration = getDuration(data, initData);\n const startDTS = getStartDTS(initData, data);\n const decodeTime = startDTS === null ? timeOffset : startDTS;\n if (\n isInvalidInitPts(initPTS, decodeTime, timeOffset, duration) ||\n (initSegment.timescale !== initPTS.timescale && accurateTimeOffset)\n ) {\n initSegment.initPTS = decodeTime - timeOffset;\n if (initPTS && initPTS.timescale === 1) {\n logger.warn(\n `Adjusting initPTS by ${initSegment.initPTS - initPTS.baseTime}`\n );\n }\n this.initPTS = initPTS = {\n baseTime: initSegment.initPTS,\n timescale: 1,\n };\n }\n\n const startTime = audioTrack\n ? decodeTime - initPTS.baseTime / initPTS.timescale\n : (lastEndTime as number);\n const endTime = startTime + duration;\n offsetStartDTS(initData, data, initPTS.baseTime / initPTS.timescale);\n\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\n const hasAudio = !!initData.audio;\n const hasVideo = !!initData.video;\n\n let type: any = '';\n if (hasAudio) {\n type += 'audio';\n }\n\n if (hasVideo) {\n type += 'video';\n }\n\n const track: RemuxedTrack = {\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\n result.audio = track.type === 'audio' ? track : undefined;\n result.video = track.type !== 'audio' ? track : undefined;\n result.initSegment = initSegment;\n result.id3 = flushTextTrackMetadataCueSamples(\n id3Track,\n timeOffset,\n initPTS,\n initPTS\n );\n\n if (textTrack.samples.length) {\n result.text = flushTextTrackUserdataCueSamples(\n textTrack,\n timeOffset,\n initPTS\n );\n }\n\n return result;\n }\n}\n\nfunction isInvalidInitPts(\n initPTS: RationalTimestamp | null,\n startDTS: number,\n timeOffset: number,\n duration: number\n): initPTS is null {\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}\n\nfunction getParsedTrackCodec(\n track: InitDataTrack | undefined,\n type: ElementaryStreamTypes.AUDIO | ElementaryStreamTypes.VIDEO\n): string {\n const parsedCodec = track?.codec;\n if (parsedCodec && parsedCodec.length > 4) {\n return parsedCodec;\n }\n // Since mp4-tools cannot parse full codec string (see 'TODO: Parse codec details'... in mp4-tools)\n // Provide defaults based on codec type\n // This allows for some playback of some fmp4 playlists without CODECS defined in manifest\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 if (parsedCodec === 'avc1' || type === ElementaryStreamTypes.VIDEO) {\n return 'avc1.42e01e';\n }\n return 'mp4a.40.5';\n}\nexport default PassThroughRemuxer;\n","'use strict';\n\nvar has = Object.prototype.hasOwnProperty\n , prefix = '~';\n\n/**\n * Constructor to create a storage for our `EE` objects.\n * An `Events` instance is a plain object whose properties are event names.\n *\n * @constructor\n * @private\n */\nfunction Events() {}\n\n//\n// We try to not inherit from `Object.prototype`. In some engines creating an\n// instance in this way is faster than calling `Object.create(null)` directly.\n// If `Object.create(null)` is not supported we prefix the event names with a\n// character to make sure that the built-in object properties are not\n// overridden or used as an attack vector.\n//\nif (Object.create) {\n Events.prototype = Object.create(null);\n\n //\n // This hack is needed because the `__proto__` property is still inherited in\n // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.\n //\n if (!new Events().__proto__) prefix = false;\n}\n\n/**\n * Representation of a single event listener.\n *\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} [once=false] Specify if the listener is a one-time listener.\n * @constructor\n * @private\n */\nfunction EE(fn, context, once) {\n this.fn = fn;\n this.context = context;\n this.once = once || false;\n}\n\n/**\n * Add a listener for a given event.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} context The context to invoke the listener with.\n * @param {Boolean} once Specify if the listener is a one-time listener.\n * @returns {EventEmitter}\n * @private\n */\nfunction addListener(emitter, event, fn, context, once) {\n if (typeof fn !== 'function') {\n throw new TypeError('The listener must be a function');\n }\n\n var listener = new EE(fn, context || emitter, once)\n , evt = prefix ? prefix + event : event;\n\n if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;\n else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);\n else emitter._events[evt] = [emitter._events[evt], listener];\n\n return emitter;\n}\n\n/**\n * Clear event by name.\n *\n * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.\n * @param {(String|Symbol)} evt The Event name.\n * @private\n */\nfunction clearEvent(emitter, evt) {\n if (--emitter._eventsCount === 0) emitter._events = new Events();\n else delete emitter._events[evt];\n}\n\n/**\n * Minimal `EventEmitter` interface that is molded against the Node.js\n * `EventEmitter` interface.\n *\n * @constructor\n * @public\n */\nfunction EventEmitter() {\n this._events = new Events();\n this._eventsCount = 0;\n}\n\n/**\n * Return an array listing the events for which the emitter has registered\n * listeners.\n *\n * @returns {Array}\n * @public\n */\nEventEmitter.prototype.eventNames = function eventNames() {\n var names = []\n , events\n , name;\n\n if (this._eventsCount === 0) return names;\n\n for (name in (events = this._events)) {\n if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);\n }\n\n if (Object.getOwnPropertySymbols) {\n return names.concat(Object.getOwnPropertySymbols(events));\n }\n\n return names;\n};\n\n/**\n * Return the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Array} The registered listeners.\n * @public\n */\nEventEmitter.prototype.listeners = function listeners(event) {\n var evt = prefix ? prefix + event : event\n , handlers = this._events[evt];\n\n if (!handlers) return [];\n if (handlers.fn) return [handlers.fn];\n\n for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {\n ee[i] = handlers[i].fn;\n }\n\n return ee;\n};\n\n/**\n * Return the number of listeners listening to a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Number} The number of listeners.\n * @public\n */\nEventEmitter.prototype.listenerCount = function listenerCount(event) {\n var evt = prefix ? prefix + event : event\n , listeners = this._events[evt];\n\n if (!listeners) return 0;\n if (listeners.fn) return 1;\n return listeners.length;\n};\n\n/**\n * Calls each of the listeners registered for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @returns {Boolean} `true` if the event had listeners, else `false`.\n * @public\n */\nEventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {\n var evt = prefix ? prefix + event : event;\n\n if (!this._events[evt]) return false;\n\n var listeners = this._events[evt]\n , len = arguments.length\n , args\n , i;\n\n if (listeners.fn) {\n if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);\n\n switch (len) {\n case 1: return listeners.fn.call(listeners.context), true;\n case 2: return listeners.fn.call(listeners.context, a1), true;\n case 3: return listeners.fn.call(listeners.context, a1, a2), true;\n case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;\n case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;\n case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;\n }\n\n for (i = 1, args = new Array(len -1); i < len; i++) {\n args[i - 1] = arguments[i];\n }\n\n listeners.fn.apply(listeners.context, args);\n } else {\n var length = listeners.length\n , j;\n\n for (i = 0; i < length; i++) {\n if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);\n\n switch (len) {\n case 1: listeners[i].fn.call(listeners[i].context); break;\n case 2: listeners[i].fn.call(listeners[i].context, a1); break;\n case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;\n case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;\n default:\n if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {\n args[j - 1] = arguments[j];\n }\n\n listeners[i].fn.apply(listeners[i].context, args);\n }\n }\n }\n\n return true;\n};\n\n/**\n * Add a listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.on = function on(event, fn, context) {\n return addListener(this, event, fn, context, false);\n};\n\n/**\n * Add a one-time listener for a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn The listener function.\n * @param {*} [context=this] The context to invoke the listener with.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.once = function once(event, fn, context) {\n return addListener(this, event, fn, context, true);\n};\n\n/**\n * Remove the listeners of a given event.\n *\n * @param {(String|Symbol)} event The event name.\n * @param {Function} fn Only remove the listeners that match this function.\n * @param {*} context Only remove the listeners that have this context.\n * @param {Boolean} once Only remove one-time listeners.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {\n var evt = prefix ? prefix + event : event;\n\n if (!this._events[evt]) return this;\n if (!fn) {\n clearEvent(this, evt);\n return this;\n }\n\n var listeners = this._events[evt];\n\n if (listeners.fn) {\n if (\n listeners.fn === fn &&\n (!once || listeners.once) &&\n (!context || listeners.context === context)\n ) {\n clearEvent(this, evt);\n }\n } else {\n for (var i = 0, events = [], length = listeners.length; i < length; i++) {\n if (\n listeners[i].fn !== fn ||\n (once && !listeners[i].once) ||\n (context && listeners[i].context !== context)\n ) {\n events.push(listeners[i]);\n }\n }\n\n //\n // Reset the array, or remove it completely if we have no more listeners.\n //\n if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;\n else clearEvent(this, evt);\n }\n\n return this;\n};\n\n/**\n * Remove all listeners, or those of the specified event.\n *\n * @param {(String|Symbol)} [event] The event name.\n * @returns {EventEmitter} `this`.\n * @public\n */\nEventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {\n var evt;\n\n if (event) {\n evt = prefix ? prefix + event : event;\n if (this._events[evt]) clearEvent(this, evt);\n } else {\n this._events = new Events();\n this._eventsCount = 0;\n }\n\n return this;\n};\n\n//\n// Alias methods names because people roll like that.\n//\nEventEmitter.prototype.off = EventEmitter.prototype.removeListener;\nEventEmitter.prototype.addListener = EventEmitter.prototype.on;\n\n//\n// Expose the prefix.\n//\nEventEmitter.prefixed = prefix;\n\n//\n// Allow `EventEmitter` to be imported as module namespace.\n//\nEventEmitter.EventEmitter = EventEmitter;\n\n//\n// Expose the module.\n//\nif ('undefined' !== typeof module) {\n module.exports = EventEmitter;\n}\n","import Transmuxer, { isPromise } from '../demux/transmuxer';\nimport { Events } from '../events';\nimport { ILogFunction, enableLogs, logger } from '../utils/logger';\nimport { EventEmitter } from 'eventemitter3';\nimport { ErrorDetails, ErrorTypes } from '../errors';\nimport type { RemuxedTrack, RemuxerResult } from '../types/remuxer';\nimport type { TransmuxerResult, ChunkMetadata } from '../types/transmuxer';\n\nif (typeof __IN_WORKER__ !== 'undefined' && __IN_WORKER__) {\n startWorker(self);\n}\n\nfunction startWorker(self) {\n const observer = new EventEmitter();\n const forwardMessage = (ev, data) => {\n self.postMessage({ event: ev, data: data });\n };\n\n // forward events to main thread\n observer.on(Events.FRAG_DECRYPTED, forwardMessage);\n observer.on(Events.ERROR, forwardMessage);\n\n // forward logger events to main thread\n const forwardWorkerLogs = () => {\n for (const logFn in logger) {\n const func: ILogFunction = (message?) => {\n forwardMessage('workerLog', {\n logType: logFn,\n message,\n });\n };\n\n logger[logFn] = func;\n }\n };\n\n self.addEventListener('message', (ev) => {\n const data = ev.data;\n switch (data.cmd) {\n case 'init': {\n const config = JSON.parse(data.config);\n self.transmuxer = new Transmuxer(\n observer,\n data.typeSupported,\n config,\n data.vendor,\n data.id\n );\n enableLogs(config.debug, data.id);\n forwardWorkerLogs();\n forwardMessage('init', null);\n break;\n }\n case 'configure': {\n self.transmuxer.configure(data.config);\n break;\n }\n case 'demux': {\n const transmuxResult: TransmuxerResult | Promise<TransmuxerResult> =\n self.transmuxer.push(\n data.data,\n data.decryptdata,\n data.chunkMeta,\n data.state\n );\n if (isPromise(transmuxResult)) {\n self.transmuxer.async = true;\n transmuxResult\n .then((data) => {\n emitTransmuxComplete(self, data);\n })\n .catch((error) => {\n forwardMessage(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n chunkMeta: data.chunkMeta,\n fatal: false,\n error,\n err: error,\n reason: `transmuxer-worker push error`,\n });\n });\n } else {\n self.transmuxer.async = false;\n emitTransmuxComplete(self, transmuxResult);\n }\n break;\n }\n case 'flush': {\n const id = data.chunkMeta;\n let transmuxResult = self.transmuxer.flush(id);\n const asyncFlush = isPromise(transmuxResult);\n if (asyncFlush || self.transmuxer.async) {\n if (!isPromise(transmuxResult)) {\n transmuxResult = Promise.resolve(transmuxResult);\n }\n transmuxResult\n .then((results: Array<TransmuxerResult>) => {\n handleFlushResult(self, results as Array<TransmuxerResult>, id);\n })\n .catch((error) => {\n forwardMessage(Events.ERROR, {\n type: ErrorTypes.MEDIA_ERROR,\n details: ErrorDetails.FRAG_PARSING_ERROR,\n chunkMeta: data.chunkMeta,\n fatal: false,\n error,\n err: error,\n reason: `transmuxer-worker flush error`,\n });\n });\n } else {\n handleFlushResult(\n self,\n transmuxResult as Array<TransmuxerResult>,\n id\n );\n }\n break;\n }\n default:\n break;\n }\n });\n}\n\nfunction emitTransmuxComplete(\n self: any,\n transmuxResult: TransmuxerResult\n): boolean {\n if (isEmptyResult(transmuxResult.remuxResult)) {\n return false;\n }\n const transferable: Array<ArrayBuffer> = [];\n const { audio, video } = transmuxResult.remuxResult;\n if (audio) {\n addToTransferable(transferable, audio);\n }\n if (video) {\n addToTransferable(transferable, video);\n }\n self.postMessage(\n { event: 'transmuxComplete', data: transmuxResult },\n transferable\n );\n return true;\n}\n\n// Converts data to a transferable object https://developers.google.com/web/updates/2011/12/Transferable-Objects-Lightning-Fast)\n// in order to minimize message passing overhead\nfunction addToTransferable(\n transferable: Array<ArrayBuffer>,\n track: RemuxedTrack\n) {\n if (track.data1) {\n transferable.push(track.data1.buffer);\n }\n if (track.data2) {\n transferable.push(track.data2.buffer);\n }\n}\n\nfunction handleFlushResult(\n self: any,\n results: Array<TransmuxerResult>,\n chunkMeta: ChunkMetadata\n) {\n const parsed = results.reduce(\n (parsed, result) => emitTransmuxComplete(self, result) || parsed,\n false\n );\n if (!parsed) {\n // Emit at 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