client/src/assets/player/p2p-media-loader/hls-plugin.ts

   1 // Thanks https://github.com/streamroot/videojs-hlsjs-plugin
   2 // We duplicated this plugin to choose the hls.js version we want, because streamroot only provide a bundled file
   3
   4 import * as Hlsjs from 'hls.js/dist/hls.light.js'
   5 import videojs from 'video.js'
   6 import { HlsjsConfigHandlerOptions, QualityLevelRepresentation, QualityLevels, VideoJSTechHLS } from '../peertube-videojs-typings'
   7
   8 type ErrorCounts = {
   9   [ type: string ]: number
  10 }
  11
  12 type Metadata = {
  13   levels: Hlsjs.Level[]
  14 }
  15
  16 type CustomAudioTrack = Hlsjs.AudioTrack & { name?: string, lang?: string }
  17
  18 const registerSourceHandler = function (vjs: typeof videojs) {
  19   if (!Hlsjs.isSupported()) {
  20     console.warn('Hls.js is not supported in this browser!')
  21     return
  22   }
  23
  24   const html5 = vjs.getTech('Html5')
  25
  26   if (!html5) {
  27     console.error('Not supported version if video.js')
  28     return
  29   }
  30
  31   // FIXME: typings
  32   (html5 as any).registerSourceHandler({
  33     canHandleSource: function (source: videojs.Tech.SourceObject) {
  34       const hlsTypeRE = /^application\/x-mpegURL|application\/vnd\.apple\.mpegurl$/i
  35       const hlsExtRE = /\.m3u8/i
  36
  37       if (hlsTypeRE.test(source.type)) return 'probably'
  38       if (hlsExtRE.test(source.src)) return 'maybe'
  39
  40       return ''
  41     },
  42
  43     handleSource: function (source: videojs.Tech.SourceObject, tech: VideoJSTechHLS) {
  44       if (tech.hlsProvider) {
  45         tech.hlsProvider.dispose()
  46       }
  47
  48       tech.hlsProvider = new Html5Hlsjs(vjs, source, tech)
  49
  50       return tech.hlsProvider
  51     }
  52   }, 0);
  53
  54   // FIXME: typings
  55   (vjs as any).Html5Hlsjs = Html5Hlsjs
  56 }
  57
  58 function hlsjsConfigHandler (this: videojs.Player, options: HlsjsConfigHandlerOptions) {
  59   const player = this
  60
  61   if (!options) return
  62
  63   if (!player.srOptions_) {
  64     player.srOptions_ = {}
  65   }
  66
  67   if (!player.srOptions_.hlsjsConfig) {
  68     player.srOptions_.hlsjsConfig = options.hlsjsConfig
  69   }
  70
  71   if (!player.srOptions_.captionConfig) {
  72     player.srOptions_.captionConfig = options.captionConfig
  73   }
  74
  75   if (options.levelLabelHandler && !player.srOptions_.levelLabelHandler) {
  76     player.srOptions_.levelLabelHandler = options.levelLabelHandler
  77   }
  78 }
  79
  80 const registerConfigPlugin = function (vjs: typeof videojs) {
  81   // Used in Brightcove since we don't pass options directly there
  82   const registerVjsPlugin = vjs.registerPlugin || vjs.plugin
  83   registerVjsPlugin('hlsjs', hlsjsConfigHandler)
  84 }
  85
  86 class Html5Hlsjs {
  87   private static readonly hooks: { [id: string]: Function[] } = {}
  88
  89   private readonly videoElement: HTMLVideoElement
  90   private readonly errorCounts: ErrorCounts = {}
  91   private readonly player: videojs.Player
  92   private readonly tech: videojs.Tech
  93   private readonly source: videojs.Tech.SourceObject
  94   private readonly vjs: typeof videojs
  95
  96   private hls: Hlsjs & { manualLevel?: number, audioTrack?: any, audioTracks?: CustomAudioTrack[] } // FIXME: typings
  97   private hlsjsConfig: Partial<Hlsjs.Config & { cueHandler: any }> = null
  98
  99   private _duration: number = null
 100   private metadata: Metadata = null
 101   private isLive: boolean = null
 102   private dvrDuration: number = null
 103   private edgeMargin: number = null
 104
 105   private handlers: { [ id in 'play' | 'addtrack' | 'playing' | 'textTracksChange' | 'audioTracksChange' ]: EventListener } = {
 106     play: null,
 107     addtrack: null,
 108     playing: null,
 109     textTracksChange: null,
 110     audioTracksChange: null
 111   }
 112
 113   private uiTextTrackHandled = false
 114
 115   constructor (vjs: typeof videojs, source: videojs.Tech.SourceObject, tech: videojs.Tech) {
 116     this.vjs = vjs
 117     this.source = source
 118
 119     this.tech = tech;
 120     (this.tech as any).name_ = 'Hlsjs'
 121
 122     this.videoElement = tech.el() as HTMLVideoElement
 123     this.player = vjs((tech.options_ as any).playerId)
 124
 125     this.videoElement.addEventListener('error', event => {
 126       let errorTxt: string
 127       const mediaError = (event.currentTarget as HTMLVideoElement).error
 128
 129       switch (mediaError.code) {
 130         case mediaError.MEDIA_ERR_ABORTED:
 131           errorTxt = 'You aborted the video playback'
 132           break
 133         case mediaError.MEDIA_ERR_DECODE:
 134           errorTxt = 'The video playback was aborted due to a corruption problem or because the video used features your browser did not support'
 135           this._handleMediaError(mediaError)
 136           break
 137         case mediaError.MEDIA_ERR_NETWORK:
 138           errorTxt = 'A network error caused the video download to fail part-way'
 139           break
 140         case mediaError.MEDIA_ERR_SRC_NOT_SUPPORTED:
 141           errorTxt = 'The video could not be loaded, either because the server or network failed or because the format is not supported'
 142           break
 143
 144         default:
 145           errorTxt = mediaError.message
 146       }
 147
 148       console.error('MEDIA_ERROR: ', errorTxt)
 149     })
 150
 151     this.initialize()
 152   }
 153
 154   duration () {
 155     return this._duration || this.videoElement.duration || 0
 156   }
 157
 158   seekable () {
 159     if (this.hls.media) {
 160       if (!this.isLive) {
 161         return this.vjs.createTimeRanges(0, this.hls.media.duration)
 162       }
 163
 164       // Video.js doesn't seem to like floating point timeranges
 165       const startTime = Math.round(this.hls.media.duration - this.dvrDuration)
 166       const endTime = Math.round(this.hls.media.duration - this.edgeMargin)
 167
 168       return this.vjs.createTimeRanges(startTime, endTime)
 169     }
 170
 171     return this.vjs.createTimeRanges()
 172   }
 173
 174   // See comment for `initialize` method.
 175   dispose () {
 176     this.videoElement.removeEventListener('play', this.handlers.play)
 177     this.videoElement.textTracks.removeEventListener('addtrack', this.handlers.addtrack)
 178     this.videoElement.removeEventListener('playing', this.handlers.playing)
 179
 180     this.player.textTracks().removeEventListener('change', this.handlers.textTracksChange)
 181     this.uiTextTrackHandled = false
 182
 183     this.hls.destroy()
 184   }
 185
 186   static addHook (type: string, callback: Function) {
 187     Html5Hlsjs.hooks[ type ] = this.hooks[ type ] || []
 188     Html5Hlsjs.hooks[ type ].push(callback)
 189   }
 190
 191   static removeHook (type: string, callback: Function) {
 192     if (Html5Hlsjs.hooks[ type ] === undefined) return false
 193
 194     const index = Html5Hlsjs.hooks[ type ].indexOf(callback)
 195     if (index === -1) return false
 196
 197     Html5Hlsjs.hooks[ type ].splice(index, 1)
 198
 199     return true
 200   }
 201
 202   private _executeHooksFor (type: string) {
 203     if (Html5Hlsjs.hooks[ type ] === undefined) {
 204       return
 205     }
 206
 207     // ES3 and IE < 9
 208     for (let i = 0; i < Html5Hlsjs.hooks[ type ].length; i++) {
 209       Html5Hlsjs.hooks[ type ][ i ](this.player, this.hls)
 210     }
 211   }
 212
 213   private _handleMediaError (error: any) {
 214     if (this.errorCounts[ Hlsjs.ErrorTypes.MEDIA_ERROR ] === 1) {
 215       console.info('trying to recover media error')
 216       this.hls.recoverMediaError()
 217       return
 218     }
 219
 220     if (this.errorCounts[ Hlsjs.ErrorTypes.MEDIA_ERROR ] === 2) {
 221       console.info('2nd try to recover media error (by swapping audio codec')
 222       this.hls.swapAudioCodec()
 223       this.hls.recoverMediaError()
 224       return
 225     }
 226
 227     if (this.errorCounts[ Hlsjs.ErrorTypes.MEDIA_ERROR ] > 2) {
 228       console.info('bubbling media error up to VIDEOJS')
 229       this.tech.error = () => error
 230       this.tech.trigger('error')
 231       return
 232     }
 233   }
 234
 235   private _onError (_event: any, data: Hlsjs.errorData) {
 236     const error: { message: string, code?: number } = {
 237       message: `HLS.js error: ${data.type} - fatal: ${data.fatal} - ${data.details}`
 238     }
 239     console.error(error.message)
 240
 241     // increment/set error count
 242     if (this.errorCounts[ data.type ]) this.errorCounts[ data.type ] += 1
 243     else this.errorCounts[ data.type ] = 1
 244
 245     // Implement simple error handling based on hls.js documentation
 246     // https://github.com/dailymotion/hls.js/blob/master/API.md#fifth-step-error-handling
 247     if (data.fatal) {
 248       switch (data.type) {
 249         case Hlsjs.ErrorTypes.NETWORK_ERROR:
 250           console.info('bubbling network error up to VIDEOJS')
 251           error.code = 2
 252           this.tech.error = () => error as any
 253           this.tech.trigger('error')
 254           break
 255
 256         case Hlsjs.ErrorTypes.MEDIA_ERROR:
 257           error.code = 3
 258           this._handleMediaError(error)
 259           break
 260
 261         default:
 262           // cannot recover
 263           this.hls.destroy()
 264           console.info('bubbling error up to VIDEOJS')
 265           this.tech.error = () => error as any
 266           this.tech.trigger('error')
 267           break
 268       }
 269     }
 270   }
 271
 272   private switchQuality (qualityId: number) {
 273     this.hls.nextLevel = qualityId
 274   }
 275
 276   private _levelLabel (level: Hlsjs.Level) {
 277     if (this.player.srOptions_.levelLabelHandler) {
 278       return this.player.srOptions_.levelLabelHandler(level)
 279     }
 280
 281     if (level.height) return level.height + 'p'
 282     if (level.width) return Math.round(level.width * 9 / 16) + 'p'
 283     if (level.bitrate) return (level.bitrate / 1000) + 'kbps'
 284
 285     return 0
 286   }
 287
 288   private _relayQualityChange (qualityLevels: QualityLevels) {
 289     // Determine if it is "Auto" (all tracks enabled)
 290     let isAuto = true
 291
 292     for (let i = 0; i < qualityLevels.length; i++) {
 293       if (!qualityLevels[ i ]._enabled) {
 294         isAuto = false
 295         break
 296       }
 297     }
 298
 299     // Interact with ME
 300     if (isAuto) {
 301       this.hls.currentLevel = -1
 302       return
 303     }
 304
 305     // Find ID of highest enabled track
 306     let selectedTrack: number
 307
 308     for (selectedTrack = qualityLevels.length - 1; selectedTrack >= 0; selectedTrack--) {
 309       if (qualityLevels[ selectedTrack ]._enabled) {
 310         break
 311       }
 312     }
 313
 314     this.hls.currentLevel = selectedTrack
 315   }
 316
 317   private _handleQualityLevels () {
 318     if (!this.metadata) return
 319
 320     const qualityLevels = this.player.qualityLevels && this.player.qualityLevels()
 321     if (!qualityLevels) return
 322
 323     for (let i = 0; i < this.metadata.levels.length; i++) {
 324       const details = this.metadata.levels[ i ]
 325       const representation: QualityLevelRepresentation = {
 326         id: i,
 327         width: details.width,
 328         height: details.height,
 329         bandwidth: details.bitrate,
 330         bitrate: details.bitrate,
 331         _enabled: true
 332       }
 333
 334       const self = this
 335       representation.enabled = function (this: QualityLevels, level: number, toggle?: boolean) {
 336         // Brightcove switcher works TextTracks-style (enable tracks that it wants to ABR on)
 337         if (typeof toggle === 'boolean') {
 338           this[ level ]._enabled = toggle
 339           self._relayQualityChange(this)
 340         }
 341
 342         return this[ level ]._enabled
 343       }
 344
 345       qualityLevels.addQualityLevel(representation)
 346     }
 347   }
 348
 349   private _notifyVideoQualities () {
 350     if (!this.metadata) return
 351     const cleanTracklist = []
 352
 353     if (this.metadata.levels.length > 1) {
 354       const autoLevel = {
 355         id: -1,
 356         label: 'auto',
 357         selected: this.hls.manualLevel === -1
 358       }
 359       cleanTracklist.push(autoLevel)
 360     }
 361
 362     this.metadata.levels.forEach((level, index) => {
 363       // Don't write in level (shared reference with Hls.js)
 364       const quality = {
 365         id: index,
 366         selected: index === this.hls.manualLevel,
 367         label: this._levelLabel(level)
 368       }
 369
 370       cleanTracklist.push(quality)
 371     })
 372
 373     const payload = {
 374       qualityData: { video: cleanTracklist },
 375       qualitySwitchCallback: this.switchQuality.bind(this)
 376     }
 377
 378     this.tech.trigger('loadedqualitydata', payload)
 379
 380     // Self-de-register so we don't raise the payload multiple times
 381     this.videoElement.removeEventListener('playing', this.handlers.playing)
 382   }
 383
 384   private _updateSelectedAudioTrack () {
 385     const playerAudioTracks = this.tech.audioTracks()
 386     for (let j = 0; j < playerAudioTracks.length; j++) {
 387       // FIXME: typings
 388       if ((playerAudioTracks[ j ] as any).enabled) {
 389         this.hls.audioTrack = j
 390         break
 391       }
 392     }
 393   }
 394
 395   private _onAudioTracks () {
 396     const hlsAudioTracks = this.hls.audioTracks
 397     const playerAudioTracks = this.tech.audioTracks()
 398
 399     if (hlsAudioTracks.length > 1 && playerAudioTracks.length === 0) {
 400       // Add Hls.js audio tracks if not added yet
 401       for (let i = 0; i < hlsAudioTracks.length; i++) {
 402         playerAudioTracks.addTrack(new this.vjs.AudioTrack({
 403           id: i.toString(),
 404           kind: 'alternative',
 405           label: hlsAudioTracks[ i ].name || hlsAudioTracks[ i ].lang,
 406           language: hlsAudioTracks[ i ].lang,
 407           enabled: i === this.hls.audioTrack
 408         }))
 409       }
 410
 411       // Handle audio track change event
 412       this.handlers.audioTracksChange = this._updateSelectedAudioTrack.bind(this)
 413       playerAudioTracks.addEventListener('change', this.handlers.audioTracksChange)
 414     }
 415   }
 416
 417   private _getTextTrackLabel (textTrack: TextTrack) {
 418     // Label here is readable label and is optional (used in the UI so if it is there it should be different)
 419     return textTrack.label ? textTrack.label : textTrack.language
 420   }
 421
 422   private _isSameTextTrack (track1: TextTrack, track2: TextTrack) {
 423     return this._getTextTrackLabel(track1) === this._getTextTrackLabel(track2)
 424       && track1.kind === track2.kind
 425   }
 426
 427   private _updateSelectedTextTrack () {
 428     const playerTextTracks = this.player.textTracks()
 429     let activeTrack: TextTrack = null
 430
 431     for (let j = 0; j < playerTextTracks.length; j++) {
 432       if (playerTextTracks[ j ].mode === 'showing') {
 433         activeTrack = playerTextTracks[ j ]
 434         break
 435       }
 436     }
 437
 438     const hlsjsTracks = this.videoElement.textTracks
 439     for (let k = 0; k < hlsjsTracks.length; k++) {
 440       if (hlsjsTracks[ k ].kind === 'subtitles' || hlsjsTracks[ k ].kind === 'captions') {
 441         hlsjsTracks[ k ].mode = activeTrack && this._isSameTextTrack(hlsjsTracks[ k ], activeTrack)
 442           ? 'showing'
 443           : 'disabled'
 444       }
 445     }
 446   }
 447
 448   private _startLoad () {
 449     this.hls.startLoad(-1)
 450     this.videoElement.removeEventListener('play', this.handlers.play)
 451   }
 452
 453   private _oneLevelObjClone (obj: object) {
 454     const result = {}
 455     const objKeys = Object.keys(obj)
 456     for (let i = 0; i < objKeys.length; i++) {
 457       result[ objKeys[ i ] ] = obj[ objKeys[ i ] ]
 458     }
 459
 460     return result
 461   }
 462
 463   private _filterDisplayableTextTracks (textTracks: TextTrackList) {
 464     const displayableTracks = []
 465
 466     // Filter out tracks that is displayable (captions or subtitles)
 467     for (let idx = 0; idx < textTracks.length; idx++) {
 468       if (textTracks[ idx ].kind === 'subtitles' || textTracks[ idx ].kind === 'captions') {
 469         displayableTracks.push(textTracks[ idx ])
 470       }
 471     }
 472
 473     return displayableTracks
 474   }
 475
 476   private _updateTextTrackList () {
 477     const displayableTracks = this._filterDisplayableTextTracks(this.videoElement.textTracks)
 478     const playerTextTracks = this.player.textTracks()
 479
 480     // Add stubs to make the caption switcher shows up
 481     // Adding the Hls.js text track in will make us have double captions
 482     for (let idx = 0; idx < displayableTracks.length; idx++) {
 483       let isAdded = false
 484
 485       for (let jdx = 0; jdx < playerTextTracks.length; jdx++) {
 486         if (this._isSameTextTrack(displayableTracks[ idx ], playerTextTracks[ jdx ])) {
 487           isAdded = true
 488           break
 489         }
 490       }
 491
 492       if (!isAdded) {
 493         const hlsjsTextTrack = displayableTracks[ idx ]
 494         this.player.addRemoteTextTrack({
 495           kind: hlsjsTextTrack.kind as videojs.TextTrack.Kind,
 496           label: this._getTextTrackLabel(hlsjsTextTrack),
 497           language: hlsjsTextTrack.language,
 498           srclang: hlsjsTextTrack.language
 499         }, false)
 500       }
 501     }
 502
 503     // Handle UI switching
 504     this._updateSelectedTextTrack()
 505
 506     if (!this.uiTextTrackHandled) {
 507       this.handlers.textTracksChange = this._updateSelectedTextTrack.bind(this)
 508       playerTextTracks.addEventListener('change', this.handlers.textTracksChange)
 509
 510       this.uiTextTrackHandled = true
 511     }
 512   }
 513
 514   private _onMetaData (_event: any, data: Hlsjs.manifestLoadedData) {
 515     // This could arrive before 'loadedqualitydata' handlers is registered, remember it so we can raise it later
 516     this.metadata = data as any
 517     this._handleQualityLevels()
 518   }
 519
 520   private _createCueHandler (captionConfig: any) {
 521     return {
 522       newCue: (track: any, startTime: number, endTime: number, captionScreen: { rows: any[] }) => {
 523         let row: any
 524         let cue: VTTCue
 525         let text: string
 526         const VTTCue = (window as any).VTTCue || (window as any).TextTrackCue
 527
 528         for (let r = 0; r < captionScreen.rows.length; r++) {
 529           row = captionScreen.rows[ r ]
 530           text = ''
 531
 532           if (!row.isEmpty()) {
 533             for (let c = 0; c < row.chars.length; c++) {
 534               text += row.chars[ c ].ucharj
 535             }
 536
 537             cue = new VTTCue(startTime, endTime, text.trim())
 538
 539             // typeof null === 'object'
 540             if (captionConfig != null && typeof captionConfig === 'object') {
 541               // Copy client overridden property into the cue object
 542               const configKeys = Object.keys(captionConfig)
 543
 544               for (let k = 0; k < configKeys.length; k++) {
 545                 cue[ configKeys[ k ] ] = captionConfig[ configKeys[ k ] ]
 546               }
 547             }
 548             track.addCue(cue)
 549             if (endTime === startTime) track.addCue(new VTTCue(endTime + 5, ''))
 550           }
 551         }
 552       }
 553     }
 554   }
 555
 556   private _initHlsjs () {
 557     const techOptions = this.tech.options_ as HlsjsConfigHandlerOptions
 558     const srOptions_ = this.player.srOptions_
 559
 560     const hlsjsConfigRef = srOptions_ && srOptions_.hlsjsConfig || techOptions.hlsjsConfig
 561     // Hls.js will write to the reference thus change the object for later streams
 562     this.hlsjsConfig = hlsjsConfigRef ? this._oneLevelObjClone(hlsjsConfigRef) : {}
 563
 564     if ([ '', 'auto' ].includes(this.videoElement.preload) && !this.videoElement.autoplay && this.hlsjsConfig.autoStartLoad === undefined) {
 565       this.hlsjsConfig.autoStartLoad = false
 566     }
 567
 568     const captionConfig = srOptions_ && srOptions_.captionConfig || techOptions.captionConfig
 569     if (captionConfig) {
 570       this.hlsjsConfig.cueHandler = this._createCueHandler(captionConfig)
 571     }
 572
 573     // If the user explicitly sets autoStartLoad to false, we're not going to enter the if block above
 574     // That's why we have a separate if block here to set the 'play' listener
 575     if (this.hlsjsConfig.autoStartLoad === false) {
 576       this.handlers.play = this._startLoad.bind(this)
 577       this.videoElement.addEventListener('play', this.handlers.play)
 578     }
 579
 580     // _notifyVideoQualities sometimes runs before the quality picker event handler is registered -> no video switcher
 581     this.handlers.playing = this._notifyVideoQualities.bind(this)
 582     this.videoElement.addEventListener('playing', this.handlers.playing)
 583
 584     this.hls = new Hlsjs(this.hlsjsConfig)
 585
 586     this._executeHooksFor('beforeinitialize')
 587
 588     this.hls.on(Hlsjs.Events.ERROR, (event, data) => this._onError(event, data))
 589     this.hls.on(Hlsjs.Events.AUDIO_TRACKS_UPDATED, () => this._onAudioTracks())
 590     this.hls.on(Hlsjs.Events.MANIFEST_PARSED, (event, data) => this._onMetaData(event, data as any)) // FIXME: typings
 591     this.hls.on(Hlsjs.Events.LEVEL_LOADED, (event, data) => {
 592       // The DVR plugin will auto seek to "live edge" on start up
 593       if (this.hlsjsConfig.liveSyncDuration) {
 594         this.edgeMargin = this.hlsjsConfig.liveSyncDuration
 595       } else if (this.hlsjsConfig.liveSyncDurationCount) {
 596         this.edgeMargin = this.hlsjsConfig.liveSyncDurationCount * data.details.targetduration
 597       }
 598
 599       this.isLive = data.details.live
 600       this.dvrDuration = data.details.totalduration
 601       this._duration = this.isLive ? Infinity : data.details.totalduration
 602     })
 603     this.hls.once(Hlsjs.Events.FRAG_LOADED, () => {
 604       // Emit custom 'loadedmetadata' event for parity with `videojs-contrib-hls`
 605       // Ref: https://github.com/videojs/videojs-contrib-hls#loadedmetadata
 606       this.tech.trigger('loadedmetadata')
 607     })
 608
 609     this.hls.attachMedia(this.videoElement)
 610
 611     this.handlers.addtrack = this._updateTextTrackList.bind(this)
 612     this.videoElement.textTracks.addEventListener('addtrack', this.handlers.addtrack)
 613
 614     this.hls.loadSource(this.source.src)
 615   }
 616
 617   private initialize () {
 618     this._initHlsjs()
 619   }
 620 }
 621
 622 export {
 623   Html5Hlsjs,
 624   registerSourceHandler,
 625   registerConfigPlugin
 626 }