src/events.ts

import {
  ManifestLoadedData,
  ManifestLoadingData,
  MediaAttachedData,
  MediaAttachingData,
  LevelLoadingData,
  LevelLoadedData,
  ManifestParsedData,
  LevelUpdatedData,
  LevelsUpdatedData,
  FragParsingUserdataData,
  FragDecryptedData,
  FragLoadedData,
  InitPTSFoundData,
  CuesParsedData,
  SubtitleFragProcessedData,
  NonNativeTextTracksData,
  FragLoadingData,
  AudioTrackLoadedData,
  SubtitleTrackLoadedData,
  ErrorData,
  AudioTrackSwitchingData,
  AudioTrackSwitchedData,
  KeyLoadedData,
  KeyLoadingData,
  SubtitleTrackSwitchData,
  SubtitleTracksUpdatedData,
  LevelSwitchedData,
  FragChangedData,
  BufferAppendingData,
  BufferCodecsData,
  FragParsingMetadataData,
  FragParsingInitSegmentData,
  FragBufferedData,
  BufferFlushingData,
  BufferEOSData,
  LevelSwitchingData,
  FPSDropLevelCappingData,
  FPSDropData,
  BufferCreatedData,
  BufferAppendedData,
  LevelPTSUpdatedData,
  FragParsedData,
  AudioTracksUpdatedData,
  FragLoadEmergencyAbortedData,
  BackBufferData,
  LiveBackBufferData,
  TrackLoadingData,
  BufferFlushedData,
} from './types/events';

/**
 * @readonly
 * @enum {string}
 */
export enum Events {
  // Fired before MediaSource is attaching to media element
  MEDIA_ATTACHING = 'hlsMediaAttaching',
  // Fired when MediaSource has been successfully attached to media element
  MEDIA_ATTACHED = 'hlsMediaAttached',
  // Fired before deatching MediaSource from media element
  MEDIA_DETACHING = 'hlsMediaDetaching',
  // Fired when MediaSource has been detached from media element
  MEDIA_DETACHED = 'hlsMediaDetached',
  // Fired when the buffer is going to be reset
  BUFFER_RESET = 'hlsBufferReset',
  // Fired when we know about the codecs that we need buffers for to push into - data: {tracks : { container, codec, levelCodec, initSegment, metadata }}
  BUFFER_CODECS = 'hlsBufferCodecs',
  // fired when sourcebuffers have been created - data: { tracks : tracks }
  BUFFER_CREATED = 'hlsBufferCreated',
  // fired when we append a segment to the buffer - data: { segment: segment object }
  BUFFER_APPENDING = 'hlsBufferAppending',
  // 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}
  BUFFER_APPENDED = 'hlsBufferAppended',
  // fired when the stream is finished and we want to notify the media buffer that there will be no more data - data: { }
  BUFFER_EOS = 'hlsBufferEos',
  // fired when the media buffer should be flushed - data { startOffset, endOffset }
  BUFFER_FLUSHING = 'hlsBufferFlushing',
  // fired when the media buffer has been flushed - data: { }
  BUFFER_FLUSHED = 'hlsBufferFlushed',
  // fired to signal that a manifest loading starts - data: { url : manifestURL}
  MANIFEST_LOADING = 'hlsManifestLoading',
  // fired after manifest has been loaded - data: { levels : [available quality levels], audioTracks : [ available audio tracks ], url : manifestURL, stats : LoaderStats }
  MANIFEST_LOADED = 'hlsManifestLoaded',
  // fired after manifest has been parsed - data: { levels : [available quality levels], firstLevel : index of first quality level appearing in Manifest}
  MANIFEST_PARSED = 'hlsManifestParsed',
  // fired when a level switch is requested - data: { level : id of new level }
  LEVEL_SWITCHING = 'hlsLevelSwitching',
  // fired when a level switch is effective - data: { level : id of new level }
  LEVEL_SWITCHED = 'hlsLevelSwitched',
  // fired when a level playlist loading starts - data: { url : level URL, level : id of level being loaded}
  LEVEL_LOADING = 'hlsLevelLoading',
  // fired when a level playlist loading finishes - data: { details : levelDetails object, level : id of loaded level, stats : LoaderStats }
  LEVEL_LOADED = 'hlsLevelLoaded',
  // 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 }
  LEVEL_UPDATED = 'hlsLevelUpdated',
  // 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 }
  LEVEL_PTS_UPDATED = 'hlsLevelPtsUpdated',
  // fired to notify that levels have changed after removing a level - data: { levels : [available quality levels] }
  LEVELS_UPDATED = 'hlsLevelsUpdated',
  // fired to notify that audio track lists has been updated - data: { audioTracks : audioTracks }
  AUDIO_TRACKS_UPDATED = 'hlsAudioTracksUpdated',
  // fired when an audio track switching is requested - data: { id : audio track id }
  AUDIO_TRACK_SWITCHING = 'hlsAudioTrackSwitching',
  // fired when an audio track switch actually occurs - data: { id : audio track id }
  AUDIO_TRACK_SWITCHED = 'hlsAudioTrackSwitched',
  // fired when an audio track loading starts - data: { url : audio track URL, id : audio track id }
  AUDIO_TRACK_LOADING = 'hlsAudioTrackLoading',
  // fired when an audio track loading finishes - data: { details : levelDetails object, id : audio track id, stats : LoaderStats }
  AUDIO_TRACK_LOADED = 'hlsAudioTrackLoaded',
  // fired to notify that subtitle track lists has been updated - data: { subtitleTracks : subtitleTracks }
  SUBTITLE_TRACKS_UPDATED = 'hlsSubtitleTracksUpdated',
  // fired to notify that subtitle tracks were cleared as a result of stopping the media
  SUBTITLE_TRACKS_CLEARED = 'hlsSubtitleTracksCleared',
  // fired when an subtitle track switch occurs - data: { id : subtitle track id }
  SUBTITLE_TRACK_SWITCH = 'hlsSubtitleTrackSwitch',
  // fired when a subtitle track loading starts - data: { url : subtitle track URL, id : subtitle track id }
  SUBTITLE_TRACK_LOADING = 'hlsSubtitleTrackLoading',
  // fired when a subtitle track loading finishes - data: { details : levelDetails object, id : subtitle track id, stats : LoaderStats }
  SUBTITLE_TRACK_LOADED = 'hlsSubtitleTrackLoaded',
  // fired when a subtitle fragment has been processed - data: { success : boolean, frag : the processed frag }
  SUBTITLE_FRAG_PROCESSED = 'hlsSubtitleFragProcessed',
  // fired when a set of VTTCues to be managed externally has been parsed - data: { type: string, track: string, cues: [ VTTCue ] }
  CUES_PARSED = 'hlsCuesParsed',
  // fired when a text track to be managed externally is found - data: { tracks: [ { label: string, kind: string, default: boolean } ] }
  NON_NATIVE_TEXT_TRACKS_FOUND = 'hlsNonNativeTextTracksFound',
  // fired when the first timestamp is found - data: { id : demuxer id, initPTS: initPTS, timescale: timescale, frag : fragment object }
  INIT_PTS_FOUND = 'hlsInitPtsFound',
  // fired when a fragment loading starts - data: { frag : fragment object }
  FRAG_LOADING = 'hlsFragLoading',
  // fired when a fragment loading is progressing - data: { frag : fragment object, { trequest, tfirst, loaded } }
  // FRAG_LOAD_PROGRESS = 'hlsFragLoadProgress',
  // Identifier for fragment load aborting for emergency switch down - data: { frag : fragment object }
  FRAG_LOAD_EMERGENCY_ABORTED = 'hlsFragLoadEmergencyAborted',
  // fired when a fragment loading is completed - data: { frag : fragment object, payload : fragment payload, stats : LoaderStats }
  FRAG_LOADED = 'hlsFragLoaded',
  // fired when a fragment has finished decrypting - data: { id : demuxer id, frag: fragment object, payload : fragment payload, stats : { tstart, tdecrypt } }
  FRAG_DECRYPTED = 'hlsFragDecrypted',
  // 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 }
  FRAG_PARSING_INIT_SEGMENT = 'hlsFragParsingInitSegment',
  // fired when parsing sei text is completed - data: { id : demuxer id, frag: fragment object, samples : [ sei samples pes ] }
  FRAG_PARSING_USERDATA = 'hlsFragParsingUserdata',
  // fired when parsing id3 is completed - data: { id : demuxer id, frag: fragment object, samples : [ id3 samples pes ] }
  FRAG_PARSING_METADATA = 'hlsFragParsingMetadata',
  // 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}
  // FRAG_PARSING_DATA = 'hlsFragParsingData',
  // fired when fragment parsing is completed - data: { id : demuxer id, frag: fragment object }
  FRAG_PARSED = 'hlsFragParsed',
  // fired when fragment remuxed MP4 boxes have all been appended into SourceBuffer - data: { id : demuxer id, frag : fragment object, stats : LoaderStats }
  FRAG_BUFFERED = 'hlsFragBuffered',
  // fired when fragment matching with current media position is changing - data : { id : demuxer id, frag : fragment object }
  FRAG_CHANGED = 'hlsFragChanged',
  // Identifier for a FPS drop event - data: { curentDropped, currentDecoded, totalDroppedFrames }
  FPS_DROP = 'hlsFpsDrop',
  // triggered when FPS drop triggers auto level capping - data: { level, droppedlevel }
  FPS_DROP_LEVEL_CAPPING = 'hlsFpsDropLevelCapping',
  // 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 }
  ERROR = 'hlsError',
  // 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: { }
  DESTROYING = 'hlsDestroying',
  // fired when a decrypt key loading starts - data: { frag : fragment object }
  KEY_LOADING = 'hlsKeyLoading',
  // fired when a decrypt key loading is completed - data: { frag : fragment object, payload : key payload, stats : LoaderStats }
  KEY_LOADED = 'hlsKeyLoaded',
  // deprecated; please use BACK_BUFFER_REACHED - data : { bufferEnd: number }
  LIVE_BACK_BUFFER_REACHED = 'hlsLiveBackBufferReached',
  // fired when the back buffer is reached as defined by the backBufferLength config option - data : { bufferEnd: number }
  BACK_BUFFER_REACHED = 'hlsBackBufferReached',
}

export interface HlsListeners {
  [Events.MEDIA_ATTACHING]: (
    event: Events.MEDIA_ATTACHING,
    data: MediaAttachingData
  ) => void;
  [Events.MEDIA_ATTACHED]: (
    event: Events.MEDIA_ATTACHED,
    data: MediaAttachedData
  ) => void;
  [Events.MEDIA_DETACHING]: (event: Events.MEDIA_DETACHING) => void;
  [Events.MEDIA_DETACHED]: (event: Events.MEDIA_DETACHED) => void;
  [Events.BUFFER_RESET]: (event: Events.BUFFER_RESET) => void;
  [Events.BUFFER_CODECS]: (
    event: Events.BUFFER_CODECS,
    data: BufferCodecsData
  ) => void;
  [Events.BUFFER_CREATED]: (
    event: Events.BUFFER_CREATED,
    data: BufferCreatedData
  ) => void;
  [Events.BUFFER_APPENDING]: (
    event: Events.BUFFER_APPENDING,
    data: BufferAppendingData
  ) => void;
  [Events.BUFFER_APPENDED]: (
    event: Events.BUFFER_APPENDED,
    data: BufferAppendedData
  ) => void;
  [Events.BUFFER_EOS]: (event: Events.BUFFER_EOS, data: BufferEOSData) => void;
  [Events.BUFFER_FLUSHING]: (
    event: Events.BUFFER_FLUSHING,
    data: BufferFlushingData
  ) => void;
  [Events.BUFFER_FLUSHED]: (
    event: Events.BUFFER_FLUSHED,
    data: BufferFlushedData
  ) => void;
  [Events.MANIFEST_LOADING]: (
    event: Events.MANIFEST_LOADING,
    data: ManifestLoadingData
  ) => void;
  [Events.MANIFEST_LOADED]: (
    event: Events.MANIFEST_LOADED,
    data: ManifestLoadedData
  ) => void;
  [Events.MANIFEST_PARSED]: (
    event: Events.MANIFEST_PARSED,
    data: ManifestParsedData
  ) => void;
  [Events.LEVEL_SWITCHING]: (
    event: Events.LEVEL_SWITCHING,
    data: LevelSwitchingData
  ) => void;
  [Events.LEVEL_SWITCHED]: (
    event: Events.LEVEL_SWITCHED,
    data: LevelSwitchedData
  ) => void;
  [Events.LEVEL_LOADING]: (
    event: Events.LEVEL_LOADING,
    data: LevelLoadingData
  ) => void;
  [Events.LEVEL_LOADED]: (
    event: Events.LEVEL_LOADED,
    data: LevelLoadedData
  ) => void;
  [Events.LEVEL_UPDATED]: (
    event: Events.LEVEL_UPDATED,
    data: LevelUpdatedData
  ) => void;
  [Events.LEVEL_PTS_UPDATED]: (
    event: Events.LEVEL_PTS_UPDATED,
    data: LevelPTSUpdatedData
  ) => void;
  [Events.LEVELS_UPDATED]: (
    event: Events.LEVELS_UPDATED,
    data: LevelsUpdatedData
  ) => void;
  [Events.AUDIO_TRACKS_UPDATED]: (
    event: Events.AUDIO_TRACKS_UPDATED,
    data: AudioTracksUpdatedData
  ) => void;
  [Events.AUDIO_TRACK_SWITCHING]: (
    event: Events.AUDIO_TRACK_SWITCHING,
    data: AudioTrackSwitchingData
  ) => void;
  [Events.AUDIO_TRACK_SWITCHED]: (
    event: Events.AUDIO_TRACK_SWITCHED,
    data: AudioTrackSwitchedData
  ) => void;
  [Events.AUDIO_TRACK_LOADING]: (
    event: Events.AUDIO_TRACK_LOADING,
    data: TrackLoadingData
  ) => void;
  [Events.AUDIO_TRACK_LOADED]: (
    event: Events.AUDIO_TRACK_LOADED,
    data: AudioTrackLoadedData
  ) => void;
  [Events.SUBTITLE_TRACKS_UPDATED]: (
    event: Events.SUBTITLE_TRACKS_UPDATED,
    data: SubtitleTracksUpdatedData
  ) => void;
  [Events.SUBTITLE_TRACKS_CLEARED]: (
    event: Events.SUBTITLE_TRACKS_CLEARED
  ) => void;
  [Events.SUBTITLE_TRACK_SWITCH]: (
    event: Events.SUBTITLE_TRACK_SWITCH,
    data: SubtitleTrackSwitchData
  ) => void;
  [Events.SUBTITLE_TRACK_LOADING]: (
    event: Events.SUBTITLE_TRACK_LOADING,
    data: TrackLoadingData
  ) => void;
  [Events.SUBTITLE_TRACK_LOADED]: (
    event: Events.SUBTITLE_TRACK_LOADED,
    data: SubtitleTrackLoadedData
  ) => void;
  [Events.SUBTITLE_FRAG_PROCESSED]: (
    event: Events.SUBTITLE_FRAG_PROCESSED,
    data: SubtitleFragProcessedData
  ) => void;
  [Events.CUES_PARSED]: (
    event: Events.CUES_PARSED,
    data: CuesParsedData
  ) => void;
  [Events.NON_NATIVE_TEXT_TRACKS_FOUND]: (
    event: Events.NON_NATIVE_TEXT_TRACKS_FOUND,
    data: NonNativeTextTracksData
  ) => void;
  [Events.INIT_PTS_FOUND]: (
    event: Events.INIT_PTS_FOUND,
    data: InitPTSFoundData
  ) => void;
  [Events.FRAG_LOADING]: (
    event: Events.FRAG_LOADING,
    data: FragLoadingData
  ) => void;
  // [Events.FRAG_LOAD_PROGRESS]: TodoEventType
  [Events.FRAG_LOAD_EMERGENCY_ABORTED]: (
    event: Events.FRAG_LOAD_EMERGENCY_ABORTED,
    data: FragLoadEmergencyAbortedData
  ) => void;
  [Events.FRAG_LOADED]: (
    event: Events.FRAG_LOADED,
    data: FragLoadedData
  ) => void;
  [Events.FRAG_DECRYPTED]: (
    event: Events.FRAG_DECRYPTED,
    data: FragDecryptedData
  ) => void;
  [Events.FRAG_PARSING_INIT_SEGMENT]: (
    event: Events.FRAG_PARSING_INIT_SEGMENT,
    data: FragParsingInitSegmentData
  ) => void;
  [Events.FRAG_PARSING_USERDATA]: (
    event: Events.FRAG_PARSING_USERDATA,
    data: FragParsingUserdataData
  ) => void;
  [Events.FRAG_PARSING_METADATA]: (
    event: Events.FRAG_PARSING_METADATA,
    data: FragParsingMetadataData
  ) => void;
  // [Events.FRAG_PARSING_DATA]: TodoEventType
  [Events.FRAG_PARSED]: (
    event: Events.FRAG_PARSED,
    data: FragParsedData
  ) => void;
  [Events.FRAG_BUFFERED]: (
    event: Events.FRAG_BUFFERED,
    data: FragBufferedData
  ) => void;
  [Events.FRAG_CHANGED]: (
    event: Events.FRAG_CHANGED,
    data: FragChangedData
  ) => void;
  [Events.FPS_DROP]: (event: Events.FPS_DROP, data: FPSDropData) => void;
  [Events.FPS_DROP_LEVEL_CAPPING]: (
    event: Events.FPS_DROP_LEVEL_CAPPING,
    data: FPSDropLevelCappingData
  ) => void;
  [Events.ERROR]: (event: Events.ERROR, data: ErrorData) => void;
  [Events.DESTROYING]: (event: Events.DESTROYING) => void;
  [Events.KEY_LOADING]: (
    event: Events.KEY_LOADING,
    data: KeyLoadingData
  ) => void;
  [Events.KEY_LOADED]: (event: Events.KEY_LOADED, data: KeyLoadedData) => void;
  [Events.LIVE_BACK_BUFFER_REACHED]: (
    event: Events.LIVE_BACK_BUFFER_REACHED,
    data: LiveBackBufferData
  ) => void;
  [Events.BACK_BUFFER_REACHED]: (
    event: Events.BACK_BUFFER_REACHED,
    data: BackBufferData
  ) => void;
}
export interface HlsEventEmitter {
  on<E extends keyof HlsListeners, Context = undefined>(
    event: E,
    listener: HlsListeners[E],
    context?: Context
  ): void;
  once<E extends keyof HlsListeners, Context = undefined>(
    event: E,
    listener: HlsListeners[E],
    context?: Context
  ): void;

  removeAllListeners<E extends keyof HlsListeners>(event?: E): void;
  off<E extends keyof HlsListeners, Context = undefined>(
    event: E,
    listener?: HlsListeners[E],
    context?: Context,
    once?: boolean
  ): void;

  listeners<E extends keyof HlsListeners>(event: E): HlsListeners[E][];
  emit<E extends keyof HlsListeners>(
    event: E,
    name: E,
    eventObject: Parameters<HlsListeners[E]>[1]
  ): boolean;
  listenerCount<E extends keyof HlsListeners>(event: E): number;
}