client/src/assets/player/webtorrent/webtorrent-plugin.ts

   1 // FIXME: something weird with our path definition in tsconfig and typings
   2 // @ts-ignore
   3 import * as videojs from 'video.js'
   4
   5 import * as WebTorrent from 'webtorrent'
   6 import { VideoFile } from '../../../../../shared/models/videos/video.model'
   7 import { renderVideo } from './video-renderer'
   8 import { LoadedQualityData, PlayerNetworkInfo, VideoJSComponentInterface, WebtorrentPluginOptions } from '../peertube-videojs-typings'
   9 import { getRtcConfig, timeToInt, videoFileMaxByResolution, videoFileMinByResolution } from '../utils'
  10 import { PeertubeChunkStore } from './peertube-chunk-store'
  11 import {
  12   getAverageBandwidthInStore,
  13   getStoredMute,
  14   getStoredVolume,
  15   getStoredWebTorrentEnabled,
  16   saveAverageBandwidth
  17 } from '../peertube-player-local-storage'
  18
  19 const CacheChunkStore = require('cache-chunk-store')
  20
  21 type PlayOptions = {
  22   forcePlay?: boolean,
  23   seek?: number,
  24   delay?: number
  25 }
  26
  27 const Plugin: VideoJSComponentInterface = videojs.getPlugin('plugin')
  28 class WebTorrentPlugin extends Plugin {
  29   private readonly playerElement: HTMLVideoElement
  30
  31   private readonly autoplay: boolean = false
  32   private readonly startTime: number = 0
  33   private readonly savePlayerSrcFunction: Function
  34   private readonly videoFiles: VideoFile[]
  35   private readonly videoDuration: number
  36   private readonly CONSTANTS = {
  37     INFO_SCHEDULER: 1000, // Don't change this
  38     AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
  39     AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
  40     AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
  41     AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
  42     BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5 // Last 5 seconds to build average bandwidth
  43   }
  44
  45   private readonly webtorrent = new WebTorrent({
  46     tracker: {
  47       rtcConfig: getRtcConfig()
  48     },
  49     dht: false
  50   })
  51
  52   private player: any
  53   private currentVideoFile: VideoFile
  54   private torrent: WebTorrent.Torrent
  55
  56   private renderer: any
  57   private fakeRenderer: any
  58   private destroyingFakeRenderer = false
  59
  60   private autoResolution = true
  61   private autoResolutionPossible = true
  62   private isAutoResolutionObservation = false
  63   private playerRefusedP2P = false
  64
  65   private torrentInfoInterval: any
  66   private autoQualityInterval: any
  67   private addTorrentDelay: any
  68   private qualityObservationTimer: any
  69   private runAutoQualitySchedulerTimer: any
  70
  71   private downloadSpeeds: number[] = []
  72
  73   constructor (player: videojs.Player, options: WebtorrentPluginOptions) {
  74     super(player, options)
  75
  76     this.startTime = timeToInt(options.startTime)
  77
  78     // Disable auto play on iOS
  79     this.autoplay = options.autoplay && this.isIOS() === false
  80     this.playerRefusedP2P = !getStoredWebTorrentEnabled()
  81
  82     this.videoFiles = options.videoFiles
  83     this.videoDuration = options.videoDuration
  84
  85     this.savePlayerSrcFunction = this.player.src
  86     this.playerElement = options.playerElement
  87
  88     this.player.ready(() => {
  89       const playerOptions = this.player.options_
  90
  91       const volume = getStoredVolume()
  92       if (volume !== undefined) this.player.volume(volume)
  93
  94       const muted = playerOptions.muted !== undefined ? playerOptions.muted : getStoredMute()
  95       if (muted !== undefined) this.player.muted(muted)
  96
  97       this.player.duration(options.videoDuration)
  98
  99       this.initializePlayer()
 100       this.runTorrentInfoScheduler()
 101
 102       this.player.one('play', () => {
 103         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 104         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 105       })
 106     })
 107   }
 108
 109   dispose () {
 110     clearTimeout(this.addTorrentDelay)
 111     clearTimeout(this.qualityObservationTimer)
 112     clearTimeout(this.runAutoQualitySchedulerTimer)
 113
 114     clearInterval(this.torrentInfoInterval)
 115     clearInterval(this.autoQualityInterval)
 116
 117     // Don't need to destroy renderer, video player will be destroyed
 118     this.flushVideoFile(this.currentVideoFile, false)
 119
 120     this.destroyFakeRenderer()
 121   }
 122
 123   getCurrentResolutionId () {
 124     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 125   }
 126
 127   updateVideoFile (
 128     videoFile?: VideoFile,
 129     options: {
 130       forcePlay?: boolean,
 131       seek?: number,
 132       delay?: number
 133     } = {},
 134     done: () => void = () => { /* empty */ }
 135   ) {
 136     // Automatically choose the adapted video file
 137     if (videoFile === undefined) {
 138       const savedAverageBandwidth = getAverageBandwidthInStore()
 139       videoFile = savedAverageBandwidth
 140         ? this.getAppropriateFile(savedAverageBandwidth)
 141         : this.pickAverageVideoFile()
 142     }
 143
 144     // Don't add the same video file once again
 145     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 146       return
 147     }
 148
 149     // Do not display error to user because we will have multiple fallback
 150     this.disableErrorDisplay()
 151
 152     // Hack to "simulate" src link in video.js >= 6
 153     // Without this, we can't play the video after pausing it
 154     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 155     this.player.src = () => true
 156     const oldPlaybackRate = this.player.playbackRate()
 157
 158     const previousVideoFile = this.currentVideoFile
 159     this.currentVideoFile = videoFile
 160
 161     // Don't try on iOS that does not support MediaSource
 162     // Or don't use P2P if webtorrent is disabled
 163     if (this.isIOS() || this.playerRefusedP2P) {
 164       return this.fallbackToHttp(options, () => {
 165         this.player.playbackRate(oldPlaybackRate)
 166         return done()
 167       })
 168     }
 169
 170     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 171       this.player.playbackRate(oldPlaybackRate)
 172       return done()
 173     })
 174
 175     this.changeQuality()
 176     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.currentVideoFile.resolution.id })
 177   }
 178
 179   updateResolution (resolutionId: number, delay = 0) {
 180     // Remember player state
 181     const currentTime = this.player.currentTime()
 182     const isPaused = this.player.paused()
 183
 184     // Remove poster to have black background
 185     this.playerElement.poster = ''
 186
 187     // Hide bigPlayButton
 188     if (!isPaused) {
 189       this.player.bigPlayButton.hide()
 190     }
 191
 192     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 193     const options = {
 194       forcePlay: false,
 195       delay,
 196       seek: currentTime + (delay / 1000)
 197     }
 198     this.updateVideoFile(newVideoFile, options)
 199   }
 200
 201   flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
 202     if (videoFile !== undefined && this.webtorrent.get(videoFile.magnetUri)) {
 203       if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()
 204
 205       this.webtorrent.remove(videoFile.magnetUri)
 206       console.log('Removed ' + videoFile.magnetUri)
 207     }
 208   }
 209
 210   enableAutoResolution () {
 211     this.autoResolution = true
 212     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.getCurrentResolutionId() })
 213   }
 214
 215   disableAutoResolution (forbid = false) {
 216     if (forbid === true) this.autoResolutionPossible = false
 217
 218     this.autoResolution = false
 219     this.trigger('autoResolutionChange', { possible: this.autoResolutionPossible })
 220     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.getCurrentResolutionId() })
 221   }
 222
 223   getTorrent () {
 224     return this.torrent
 225   }
 226
 227   private addTorrent (
 228     magnetOrTorrentUrl: string,
 229     previousVideoFile: VideoFile,
 230     options: PlayOptions,
 231     done: Function
 232   ) {
 233     console.log('Adding ' + magnetOrTorrentUrl + '.')
 234
 235     const oldTorrent = this.torrent
 236     const torrentOptions = {
 237       store: (chunkLength: number, storeOpts: any) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 238         max: 100
 239       })
 240     }
 241
 242     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 243       console.log('Added ' + magnetOrTorrentUrl + '.')
 244
 245       if (oldTorrent) {
 246         // Pause the old torrent
 247         this.stopTorrent(oldTorrent)
 248
 249         // We use a fake renderer so we download correct pieces of the next file
 250         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 251       }
 252
 253       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 254       this.addTorrentDelay = setTimeout(() => {
 255         // We don't need the fake renderer anymore
 256         this.destroyFakeRenderer()
 257
 258         const paused = this.player.paused()
 259
 260         this.flushVideoFile(previousVideoFile)
 261
 262         // Update progress bar (just for the UI), do not wait rendering
 263         if (options.seek) this.player.currentTime(options.seek)
 264
 265         const renderVideoOptions = { autoplay: false, controls: true }
 266         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 267           this.renderer = renderer
 268
 269           if (err) return this.fallbackToHttp(options, done)
 270
 271           return this.tryToPlay(err => {
 272             if (err) return done(err)
 273
 274             if (options.seek) this.seek(options.seek)
 275             if (options.forcePlay === false && paused === true) this.player.pause()
 276
 277             return done()
 278           })
 279         })
 280       }, options.delay || 0)
 281     })
 282
 283     this.torrent.on('error', (err: any) => console.error(err))
 284
 285     this.torrent.on('warning', (err: any) => {
 286       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 287       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 288
 289       // Users don't care about issues with WebRTC, but developers do so log it in the console
 290       if (err.message.indexOf('Ice connection failed') !== -1) {
 291         console.log(err)
 292         return
 293       }
 294
 295       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 296       if (err.message.indexOf('incorrect info hash') !== -1) {
 297         console.error('Incorrect info hash detected, falling back to torrent file.')
 298         const newOptions = { forcePlay: true, seek: options.seek }
 299         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 300       }
 301
 302       // Remote instance is down
 303       if (err.message.indexOf('from xs param') !== -1) {
 304         this.handleError(err)
 305       }
 306
 307       console.warn(err)
 308     })
 309   }
 310
 311   private tryToPlay (done?: (err?: Error) => void) {
 312     if (!done) done = function () { /* empty */ }
 313
 314     const playPromise = this.player.play()
 315     if (playPromise !== undefined) {
 316       return playPromise.then(done)
 317                         .catch((err: Error) => {
 318                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 319                             return
 320                           }
 321
 322                           console.error(err)
 323                           this.player.pause()
 324                           this.player.posterImage.show()
 325                           this.player.removeClass('vjs-has-autoplay')
 326                           this.player.removeClass('vjs-has-big-play-button-clicked')
 327
 328                           return done()
 329                         })
 330     }
 331
 332     return done()
 333   }
 334
 335   private seek (time: number) {
 336     this.player.currentTime(time)
 337     this.player.handleTechSeeked_()
 338   }
 339
 340   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 341     if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
 342     if (this.videoFiles.length === 1) return this.videoFiles[0]
 343
 344     // Don't change the torrent is the play was ended
 345     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 346
 347     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 348
 349     // Limit resolution according to player height
 350     const playerHeight = this.playerElement.offsetHeight as number
 351
 352     // We take the first resolution just above the player height
 353     // Example: player height is 530px, we want the 720p file instead of 480p
 354     let maxResolution = this.videoFiles[0].resolution.id
 355     for (let i = this.videoFiles.length - 1; i >= 0; i--) {
 356       const resolutionId = this.videoFiles[i].resolution.id
 357       if (resolutionId >= playerHeight) {
 358         maxResolution = resolutionId
 359         break
 360       }
 361     }
 362
 363     // Filter videos we can play according to our screen resolution and bandwidth
 364     const filteredFiles = this.videoFiles
 365                               .filter(f => f.resolution.id <= maxResolution)
 366                               .filter(f => {
 367                                 const fileBitrate = (f.size / this.videoDuration)
 368                                 let threshold = fileBitrate
 369
 370                                 // If this is for a higher resolution or an initial load: add a margin
 371                                 if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
 372                                   threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
 373                                 }
 374
 375                                 return averageDownloadSpeed > threshold
 376                               })
 377
 378     // If the download speed is too bad, return the lowest resolution we have
 379     if (filteredFiles.length === 0) return videoFileMinByResolution(this.videoFiles)
 380
 381     return videoFileMaxByResolution(filteredFiles)
 382   }
 383
 384   private getAndSaveActualDownloadSpeed () {
 385     const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
 386     const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
 387     if (lastDownloadSpeeds.length === 0) return -1
 388
 389     const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
 390     const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)
 391
 392     // Save the average bandwidth for future use
 393     saveAverageBandwidth(averageBandwidth)
 394
 395     return averageBandwidth
 396   }
 397
 398   private initializePlayer () {
 399     this.buildQualities()
 400
 401     if (this.autoplay === true) {
 402       this.player.posterImage.hide()
 403
 404       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 405     }
 406
 407     // Proxy first play
 408     const oldPlay = this.player.play.bind(this.player)
 409     this.player.play = () => {
 410       this.player.addClass('vjs-has-big-play-button-clicked')
 411       this.player.play = oldPlay
 412
 413       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 414     }
 415   }
 416
 417   private runAutoQualityScheduler () {
 418     this.autoQualityInterval = setInterval(() => {
 419
 420       // Not initialized or in HTTP fallback
 421       if (this.torrent === undefined || this.torrent === null) return
 422       if (this.autoResolution === false) return
 423       if (this.isAutoResolutionObservation === true) return
 424
 425       const file = this.getAppropriateFile()
 426       let changeResolution = false
 427       let changeResolutionDelay = 0
 428
 429       // Lower resolution
 430       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 431         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 432         changeResolution = true
 433       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 434         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 435         changeResolution = true
 436         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 437       }
 438
 439       if (changeResolution === true) {
 440         this.updateResolution(file.resolution.id, changeResolutionDelay)
 441
 442         // Wait some seconds in observation of our new resolution
 443         this.isAutoResolutionObservation = true
 444
 445         this.qualityObservationTimer = setTimeout(() => {
 446           this.isAutoResolutionObservation = false
 447         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 448       }
 449     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 450   }
 451
 452   private isPlayerWaiting () {
 453     return this.player && this.player.hasClass('vjs-waiting')
 454   }
 455
 456   private runTorrentInfoScheduler () {
 457     this.torrentInfoInterval = setInterval(() => {
 458       // Not initialized yet
 459       if (this.torrent === undefined) return
 460
 461       // Http fallback
 462       if (this.torrent === null) return this.player.trigger('p2pInfo', false)
 463
 464       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 465       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 466
 467       return this.player.trigger('p2pInfo', {
 468         http: {
 469           downloadSpeed: 0,
 470           uploadSpeed: 0,
 471           downloaded: 0,
 472           uploaded: 0
 473         },
 474         p2p: {
 475           downloadSpeed: this.torrent.downloadSpeed,
 476           numPeers: this.torrent.numPeers,
 477           uploadSpeed: this.torrent.uploadSpeed,
 478           downloaded: this.torrent.downloaded,
 479           uploaded: this.torrent.uploaded
 480         }
 481       } as PlayerNetworkInfo)
 482     }, this.CONSTANTS.INFO_SCHEDULER)
 483   }
 484
 485   private fallbackToHttp (options: PlayOptions, done?: Function) {
 486     const paused = this.player.paused()
 487
 488     this.disableAutoResolution(true)
 489
 490     this.flushVideoFile(this.currentVideoFile, true)
 491     this.torrent = null
 492
 493     // Enable error display now this is our last fallback
 494     this.player.one('error', () => this.enableErrorDisplay())
 495
 496     const httpUrl = this.currentVideoFile.fileUrl
 497     this.player.src = this.savePlayerSrcFunction
 498     this.player.src(httpUrl)
 499
 500     this.changeQuality()
 501
 502     // We changed the source, so reinit captions
 503     this.player.trigger('sourcechange')
 504
 505     return this.tryToPlay(err => {
 506       if (err && done) return done(err)
 507
 508       if (options.seek) this.seek(options.seek)
 509       if (options.forcePlay === false && paused === true) this.player.pause()
 510
 511       if (done) return done()
 512     })
 513   }
 514
 515   private handleError (err: Error | string) {
 516     return this.player.trigger('customError', { err })
 517   }
 518
 519   private enableErrorDisplay () {
 520     this.player.addClass('vjs-error-display-enabled')
 521   }
 522
 523   private disableErrorDisplay () {
 524     this.player.removeClass('vjs-error-display-enabled')
 525   }
 526
 527   private isIOS () {
 528     return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
 529   }
 530
 531   private pickAverageVideoFile () {
 532     if (this.videoFiles.length === 1) return this.videoFiles[0]
 533
 534     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 535   }
 536
 537   private stopTorrent (torrent: WebTorrent.Torrent) {
 538     torrent.pause()
 539     // Pause does not remove actual peers (in particular the webseed peer)
 540     torrent.removePeer(torrent[ 'ws' ])
 541   }
 542
 543   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 544     this.destroyingFakeRenderer = false
 545
 546     const fakeVideoElem = document.createElement('video')
 547     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 548       this.fakeRenderer = renderer
 549
 550       // The renderer returns an error when we destroy it, so skip them
 551       if (this.destroyingFakeRenderer === false && err) {
 552         console.error('Cannot render new torrent in fake video element.', err)
 553       }
 554
 555       // Load the future file at the correct time (in delay MS - 2 seconds)
 556       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 557     })
 558   }
 559
 560   private destroyFakeRenderer () {
 561     if (this.fakeRenderer) {
 562       this.destroyingFakeRenderer = true
 563
 564       if (this.fakeRenderer.destroy) {
 565         try {
 566           this.fakeRenderer.destroy()
 567         } catch (err) {
 568           console.log('Cannot destroy correctly fake renderer.', err)
 569         }
 570       }
 571       this.fakeRenderer = undefined
 572     }
 573   }
 574
 575   private buildQualities () {
 576     const qualityLevelsPayload = []
 577
 578     for (const file of this.videoFiles) {
 579       const representation = {
 580         id: file.resolution.id,
 581         label: this.buildQualityLabel(file),
 582         height: file.resolution.id,
 583         _enabled: true
 584       }
 585
 586       this.player.qualityLevels().addQualityLevel(representation)
 587
 588       qualityLevelsPayload.push({
 589         id: representation.id,
 590         label: representation.label,
 591         selected: false
 592       })
 593     }
 594
 595     const payload: LoadedQualityData = {
 596       qualitySwitchCallback: (d: any) => this.qualitySwitchCallback(d),
 597       qualityData: {
 598         video: qualityLevelsPayload
 599       }
 600     }
 601     this.player.tech_.trigger('loadedqualitydata', payload)
 602   }
 603
 604   private buildQualityLabel (file: VideoFile) {
 605     let label = file.resolution.label
 606
 607     if (file.fps && file.fps >= 50) {
 608       label += file.fps
 609     }
 610
 611     return label
 612   }
 613
 614   private qualitySwitchCallback (id: number) {
 615     if (id === -1) {
 616       if (this.autoResolutionPossible === true) this.enableAutoResolution()
 617       return
 618     }
 619
 620     this.disableAutoResolution()
 621     this.updateResolution(id)
 622   }
 623
 624   private changeQuality () {
 625     const resolutionId = this.currentVideoFile.resolution.id
 626     const qualityLevels = this.player.qualityLevels()
 627
 628     if (resolutionId === -1) {
 629       qualityLevels.selectedIndex = -1
 630       return
 631     }
 632
 633     for (let i = 0; i < qualityLevels; i++) {
 634       const q = this.player.qualityLevels[i]
 635       if (q.height === resolutionId) qualityLevels.selectedIndex = i
 636     }
 637   }
 638 }
 639
 640 videojs.registerPlugin('webtorrent', WebTorrentPlugin)
 641 export { WebTorrentPlugin }