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

   1 import videojs from 'video.js'
   2 import * as WebTorrent from 'webtorrent'
   3 import { renderVideo } from './video-renderer'
   4 import { LoadedQualityData, PlayerNetworkInfo, WebtorrentPluginOptions } from '../peertube-videojs-typings'
   5 import { getRtcConfig, timeToInt, videoFileMaxByResolution, videoFileMinByResolution, isIOS, isSafari } from '../utils'
   6 import { PeertubeChunkStore } from './peertube-chunk-store'
   7 import {
   8   getAverageBandwidthInStore,
   9   getStoredMute,
  10   getStoredP2PEnabled,
  11   getStoredVolume,
  12   saveAverageBandwidth
  13 } from '../peertube-player-local-storage'
  14 import { VideoFile } from '@shared/models'
  15
  16 const CacheChunkStore = require('cache-chunk-store')
  17
  18 type PlayOptions = {
  19   forcePlay?: boolean,
  20   seek?: number,
  21   delay?: number
  22 }
  23
  24 const Plugin = videojs.getPlugin('plugin')
  25
  26 class WebTorrentPlugin extends Plugin {
  27   readonly videoFiles: VideoFile[]
  28
  29   private readonly playerElement: HTMLVideoElement
  30
  31   private readonly autoplay: boolean = false
  32   private readonly startTime: number = 0
  33   private readonly savePlayerSrcFunction: videojs.Player['src']
  34   private readonly videoDuration: number
  35   private readonly CONSTANTS = {
  36     INFO_SCHEDULER: 1000, // Don't change this
  37     AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
  38     AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
  39     AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
  40     AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
  41     BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5 // Last 5 seconds to build average bandwidth
  42   }
  43
  44   private readonly webtorrent = new WebTorrent({
  45     tracker: {
  46       rtcConfig: getRtcConfig()
  47     },
  48     dht: false
  49   })
  50
  51   private currentVideoFile: VideoFile
  52   private torrent: WebTorrent.Torrent
  53
  54   private renderer: any
  55   private fakeRenderer: any
  56   private destroyingFakeRenderer = false
  57
  58   private autoResolution = true
  59   private autoResolutionPossible = true
  60   private isAutoResolutionObservation = false
  61   private playerRefusedP2P = false
  62
  63   private torrentInfoInterval: any
  64   private autoQualityInterval: any
  65   private addTorrentDelay: any
  66   private qualityObservationTimer: any
  67   private runAutoQualitySchedulerTimer: any
  68
  69   private downloadSpeeds: number[] = []
  70
  71   constructor (player: videojs.Player, options?: WebtorrentPluginOptions) {
  72     super(player)
  73
  74     this.startTime = timeToInt(options.startTime)
  75
  76     // Disable auto play on iOS
  77     this.autoplay = options.autoplay
  78     this.playerRefusedP2P = !getStoredP2PEnabled()
  79
  80     this.videoFiles = options.videoFiles
  81     this.videoDuration = options.videoDuration
  82
  83     this.savePlayerSrcFunction = this.player.src
  84     this.playerElement = options.playerElement
  85
  86     this.player.ready(() => {
  87       const playerOptions = this.player.options_
  88
  89       const volume = getStoredVolume()
  90       if (volume !== undefined) this.player.volume(volume)
  91
  92       const muted = playerOptions.muted !== undefined ? playerOptions.muted : getStoredMute()
  93       if (muted !== undefined) this.player.muted(muted)
  94
  95       this.player.duration(options.videoDuration)
  96
  97       this.initializePlayer()
  98       this.runTorrentInfoScheduler()
  99
 100       this.player.one('play', () => {
 101         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 102         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 103       })
 104     })
 105   }
 106
 107   dispose () {
 108     clearTimeout(this.addTorrentDelay)
 109     clearTimeout(this.qualityObservationTimer)
 110     clearTimeout(this.runAutoQualitySchedulerTimer)
 111
 112     clearInterval(this.torrentInfoInterval)
 113     clearInterval(this.autoQualityInterval)
 114
 115     // Don't need to destroy renderer, video player will be destroyed
 116     this.flushVideoFile(this.currentVideoFile, false)
 117
 118     this.destroyFakeRenderer()
 119   }
 120
 121   getCurrentResolutionId () {
 122     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 123   }
 124
 125   updateVideoFile (
 126     videoFile?: VideoFile,
 127     options: {
 128       forcePlay?: boolean,
 129       seek?: number,
 130       delay?: number
 131     } = {},
 132     done: () => void = () => { /* empty */ }
 133   ) {
 134     // Automatically choose the adapted video file
 135     if (videoFile === undefined) {
 136       const savedAverageBandwidth = getAverageBandwidthInStore()
 137       videoFile = savedAverageBandwidth
 138         ? this.getAppropriateFile(savedAverageBandwidth)
 139         : this.pickAverageVideoFile()
 140     }
 141
 142     // Don't add the same video file once again
 143     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 144       return
 145     }
 146
 147     // Do not display error to user because we will have multiple fallback
 148     this.disableErrorDisplay();
 149
 150     // Hack to "simulate" src link in video.js >= 6
 151     // Without this, we can't play the video after pausing it
 152     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 153     (this.player as any).src = () => true
 154     const oldPlaybackRate = this.player.playbackRate()
 155
 156     const previousVideoFile = this.currentVideoFile
 157     this.currentVideoFile = videoFile
 158
 159     // Don't try on iOS that does not support MediaSource
 160     // Or don't use P2P if webtorrent is disabled
 161     if (isIOS() || this.playerRefusedP2P) {
 162       return this.fallbackToHttp(options, () => {
 163         this.player.playbackRate(oldPlaybackRate)
 164         return done()
 165       })
 166     }
 167
 168     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 169       this.player.playbackRate(oldPlaybackRate)
 170       return done()
 171     })
 172
 173     this.changeQuality()
 174     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.currentVideoFile.resolution.id })
 175   }
 176
 177   updateResolution (resolutionId: number, delay = 0) {
 178     // Remember player state
 179     const currentTime = this.player.currentTime()
 180     const isPaused = this.player.paused()
 181
 182     // Hide bigPlayButton
 183     if (!isPaused) {
 184       this.player.bigPlayButton.hide()
 185     }
 186
 187     // Audio-only (resolutionId === 0) gets special treatment
 188     if (resolutionId === 0) {
 189       // Audio-only: show poster, do not auto-hide controls
 190       this.player.addClass('vjs-playing-audio-only-content')
 191       this.player.posterImage.show()
 192     } else {
 193       // Hide poster to have black background
 194       this.player.removeClass('vjs-playing-audio-only-content')
 195       this.player.posterImage.hide()
 196     }
 197
 198     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 199     const options = {
 200       forcePlay: false,
 201       delay,
 202       seek: currentTime + (delay / 1000)
 203     }
 204
 205     this.updateVideoFile(newVideoFile, options)
 206   }
 207
 208   flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
 209     if (videoFile !== undefined && this.webtorrent.get(videoFile.magnetUri)) {
 210       if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()
 211
 212       this.webtorrent.remove(videoFile.magnetUri)
 213       console.log('Removed ' + videoFile.magnetUri)
 214     }
 215   }
 216
 217   enableAutoResolution () {
 218     this.autoResolution = true
 219     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.getCurrentResolutionId() })
 220   }
 221
 222   disableAutoResolution (forbid = false) {
 223     if (forbid === true) this.autoResolutionPossible = false
 224
 225     this.autoResolution = false
 226     this.trigger('autoResolutionChange', { possible: this.autoResolutionPossible })
 227     this.trigger('resolutionChange', { auto: this.autoResolution, resolutionId: this.getCurrentResolutionId() })
 228   }
 229
 230   isAutoResolutionPossible () {
 231     return this.autoResolutionPossible
 232   }
 233
 234   getTorrent () {
 235     return this.torrent
 236   }
 237
 238   getCurrentVideoFile () {
 239     return this.currentVideoFile
 240   }
 241
 242   private addTorrent (
 243     magnetOrTorrentUrl: string,
 244     previousVideoFile: VideoFile,
 245     options: PlayOptions,
 246     done: Function
 247   ) {
 248     console.log('Adding ' + magnetOrTorrentUrl + '.')
 249
 250     const oldTorrent = this.torrent
 251     const torrentOptions = {
 252       // Don't use arrow function: it breaks webtorrent (that uses `new` keyword)
 253       store: function (chunkLength: number, storeOpts: any) {
 254         return new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 255           max: 100
 256         })
 257       }
 258     }
 259
 260     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 261       console.log('Added ' + magnetOrTorrentUrl + '.')
 262
 263       if (oldTorrent) {
 264         // Pause the old torrent
 265         this.stopTorrent(oldTorrent)
 266
 267         // We use a fake renderer so we download correct pieces of the next file
 268         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 269       }
 270
 271       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 272       this.addTorrentDelay = setTimeout(() => {
 273         // We don't need the fake renderer anymore
 274         this.destroyFakeRenderer()
 275
 276         const paused = this.player.paused()
 277
 278         this.flushVideoFile(previousVideoFile)
 279
 280         // Update progress bar (just for the UI), do not wait rendering
 281         if (options.seek) this.player.currentTime(options.seek)
 282
 283         const renderVideoOptions = { autoplay: false, controls: true }
 284         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 285           this.renderer = renderer
 286
 287           if (err) return this.fallbackToHttp(options, done)
 288
 289           return this.tryToPlay(err => {
 290             if (err) return done(err)
 291
 292             if (options.seek) this.seek(options.seek)
 293             if (options.forcePlay === false && paused === true) this.player.pause()
 294
 295             return done()
 296           })
 297         })
 298       }, options.delay || 0)
 299     })
 300
 301     this.torrent.on('error', (err: any) => console.error(err))
 302
 303     this.torrent.on('warning', (err: any) => {
 304       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 305       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 306
 307       // Users don't care about issues with WebRTC, but developers do so log it in the console
 308       if (err.message.indexOf('Ice connection failed') !== -1) {
 309         console.log(err)
 310         return
 311       }
 312
 313       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 314       if (err.message.indexOf('incorrect info hash') !== -1) {
 315         console.error('Incorrect info hash detected, falling back to torrent file.')
 316         const newOptions = { forcePlay: true, seek: options.seek }
 317         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 318       }
 319
 320       // Remote instance is down
 321       if (err.message.indexOf('from xs param') !== -1) {
 322         this.handleError(err)
 323       }
 324
 325       console.warn(err)
 326     })
 327   }
 328
 329   private tryToPlay (done?: (err?: Error) => void) {
 330     if (!done) done = function () { /* empty */ }
 331
 332     const playPromise = this.player.play()
 333     if (playPromise !== undefined) {
 334       return playPromise.then(() => done())
 335                         .catch((err: Error) => {
 336                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 337                             return
 338                           }
 339
 340                           console.error(err)
 341                           this.player.pause()
 342                           this.player.posterImage.show()
 343                           this.player.removeClass('vjs-has-autoplay')
 344                           this.player.removeClass('vjs-has-big-play-button-clicked')
 345                           this.player.removeClass('vjs-playing-audio-only-content')
 346
 347                           return done()
 348                         })
 349     }
 350
 351     return done()
 352   }
 353
 354   private seek (time: number) {
 355     this.player.currentTime(time)
 356     this.player.handleTechSeeked_()
 357   }
 358
 359   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 360     if (this.videoFiles === undefined) return undefined
 361
 362     const files = this.videoFiles.filter(f => f.resolution.id !== 0)
 363
 364     if (files.length === 0) return undefined
 365     if (files.length === 1) return files[0]
 366
 367     // Don't change the torrent if the player ended
 368     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 369
 370     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 371
 372     // Limit resolution according to player height
 373     const playerHeight = this.playerElement.offsetHeight
 374
 375     // We take the first resolution just above the player height
 376     // Example: player height is 530px, we want the 720p file instead of 480p
 377     let maxResolution = files[0].resolution.id
 378     for (let i = files.length - 1; i >= 0; i--) {
 379       const resolutionId = files[i].resolution.id
 380       if (resolutionId !== 0 && resolutionId >= playerHeight) {
 381         maxResolution = resolutionId
 382         break
 383       }
 384     }
 385
 386     // Filter videos we can play according to our screen resolution and bandwidth
 387     const filteredFiles = files.filter(f => f.resolution.id <= maxResolution)
 388                                .filter(f => {
 389                                  const fileBitrate = (f.size / this.videoDuration)
 390                                  let threshold = fileBitrate
 391
 392                                  // If this is for a higher resolution or an initial load: add a margin
 393                                  if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
 394                                    threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
 395                                  }
 396
 397                                  return averageDownloadSpeed > threshold
 398                                })
 399
 400     // If the download speed is too bad, return the lowest resolution we have
 401     if (filteredFiles.length === 0) return videoFileMinByResolution(files)
 402
 403     return videoFileMaxByResolution(filteredFiles)
 404   }
 405
 406   private getAndSaveActualDownloadSpeed () {
 407     const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
 408     const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
 409     if (lastDownloadSpeeds.length === 0) return -1
 410
 411     const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
 412     const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)
 413
 414     // Save the average bandwidth for future use
 415     saveAverageBandwidth(averageBandwidth)
 416
 417     return averageBandwidth
 418   }
 419
 420   private initializePlayer () {
 421     this.buildQualities()
 422
 423     if (this.autoplay) {
 424       this.player.posterImage.hide()
 425
 426       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 427     }
 428
 429     // Proxy first play
 430     const oldPlay = this.player.play.bind(this.player);
 431     (this.player as any).play = () => {
 432       this.player.addClass('vjs-has-big-play-button-clicked')
 433       this.player.play = oldPlay
 434
 435       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 436     }
 437   }
 438
 439   private runAutoQualityScheduler () {
 440     this.autoQualityInterval = setInterval(() => {
 441
 442       // Not initialized or in HTTP fallback
 443       if (this.torrent === undefined || this.torrent === null) return
 444       if (this.autoResolution === false) return
 445       if (this.isAutoResolutionObservation === true) return
 446
 447       const file = this.getAppropriateFile()
 448       let changeResolution = false
 449       let changeResolutionDelay = 0
 450
 451       // Lower resolution
 452       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 453         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 454         changeResolution = true
 455       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 456         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 457         changeResolution = true
 458         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 459       }
 460
 461       if (changeResolution === true) {
 462         this.updateResolution(file.resolution.id, changeResolutionDelay)
 463
 464         // Wait some seconds in observation of our new resolution
 465         this.isAutoResolutionObservation = true
 466
 467         this.qualityObservationTimer = setTimeout(() => {
 468           this.isAutoResolutionObservation = false
 469         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 470       }
 471     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 472   }
 473
 474   private isPlayerWaiting () {
 475     return this.player && this.player.hasClass('vjs-waiting')
 476   }
 477
 478   private runTorrentInfoScheduler () {
 479     this.torrentInfoInterval = setInterval(() => {
 480       // Not initialized yet
 481       if (this.torrent === undefined) return
 482
 483       // Http fallback
 484       if (this.torrent === null) return this.player.trigger('p2pInfo', false)
 485
 486       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 487       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 488
 489       return this.player.trigger('p2pInfo', {
 490         source: 'webtorrent',
 491         http: {
 492           downloadSpeed: 0,
 493           uploadSpeed: 0,
 494           downloaded: 0,
 495           uploaded: 0
 496         },
 497         p2p: {
 498           downloadSpeed: this.torrent.downloadSpeed,
 499           numPeers: this.torrent.numPeers,
 500           uploadSpeed: this.torrent.uploadSpeed,
 501           downloaded: this.torrent.downloaded,
 502           uploaded: this.torrent.uploaded
 503         }
 504       } as PlayerNetworkInfo)
 505     }, this.CONSTANTS.INFO_SCHEDULER)
 506   }
 507
 508   private fallbackToHttp (options: PlayOptions, done?: Function) {
 509     const paused = this.player.paused()
 510
 511     this.disableAutoResolution(true)
 512
 513     this.flushVideoFile(this.currentVideoFile, true)
 514     this.torrent = null
 515
 516     // Enable error display now this is our last fallback
 517     this.player.one('error', () => this.enableErrorDisplay())
 518
 519     const httpUrl = this.currentVideoFile.fileUrl
 520     this.player.src = this.savePlayerSrcFunction
 521     this.player.src(httpUrl)
 522
 523     this.changeQuality()
 524
 525     // We changed the source, so reinit captions
 526     this.player.trigger('sourcechange')
 527
 528     return this.tryToPlay(err => {
 529       if (err && done) return done(err)
 530
 531       if (options.seek) this.seek(options.seek)
 532       if (options.forcePlay === false && paused === true) this.player.pause()
 533
 534       if (done) return done()
 535     })
 536   }
 537
 538   private handleError (err: Error | string) {
 539     return this.player.trigger('customError', { err })
 540   }
 541
 542   private enableErrorDisplay () {
 543     this.player.addClass('vjs-error-display-enabled')
 544   }
 545
 546   private disableErrorDisplay () {
 547     this.player.removeClass('vjs-error-display-enabled')
 548   }
 549
 550   private pickAverageVideoFile () {
 551     if (this.videoFiles.length === 1) return this.videoFiles[0]
 552
 553     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 554   }
 555
 556   private stopTorrent (torrent: WebTorrent.Torrent) {
 557     torrent.pause()
 558     // Pause does not remove actual peers (in particular the webseed peer)
 559     torrent.removePeer(torrent[ 'ws' ])
 560   }
 561
 562   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 563     this.destroyingFakeRenderer = false
 564
 565     const fakeVideoElem = document.createElement('video')
 566     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 567       this.fakeRenderer = renderer
 568
 569       // The renderer returns an error when we destroy it, so skip them
 570       if (this.destroyingFakeRenderer === false && err) {
 571         console.error('Cannot render new torrent in fake video element.', err)
 572       }
 573
 574       // Load the future file at the correct time (in delay MS - 2 seconds)
 575       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 576     })
 577   }
 578
 579   private destroyFakeRenderer () {
 580     if (this.fakeRenderer) {
 581       this.destroyingFakeRenderer = true
 582
 583       if (this.fakeRenderer.destroy) {
 584         try {
 585           this.fakeRenderer.destroy()
 586         } catch (err) {
 587           console.log('Cannot destroy correctly fake renderer.', err)
 588         }
 589       }
 590       this.fakeRenderer = undefined
 591     }
 592   }
 593
 594   private buildQualities () {
 595     const qualityLevelsPayload = []
 596
 597     for (const file of this.videoFiles) {
 598       const representation = {
 599         id: file.resolution.id,
 600         label: this.buildQualityLabel(file),
 601         height: file.resolution.id,
 602         _enabled: true
 603       }
 604
 605       this.player.qualityLevels().addQualityLevel(representation)
 606
 607       qualityLevelsPayload.push({
 608         id: representation.id,
 609         label: representation.label,
 610         selected: false
 611       })
 612     }
 613
 614     const payload: LoadedQualityData = {
 615       qualitySwitchCallback: (d: any) => this.qualitySwitchCallback(d),
 616       qualityData: {
 617         video: qualityLevelsPayload
 618       }
 619     }
 620     this.player.tech(true).trigger('loadedqualitydata', payload)
 621   }
 622
 623   private buildQualityLabel (file: VideoFile) {
 624     let label = file.resolution.label
 625
 626     if (file.fps && file.fps >= 50) {
 627       label += file.fps
 628     }
 629
 630     return label
 631   }
 632
 633   private qualitySwitchCallback (id: number) {
 634     if (id === -1) {
 635       if (this.autoResolutionPossible === true) this.enableAutoResolution()
 636       return
 637     }
 638
 639     this.disableAutoResolution()
 640     this.updateResolution(id)
 641   }
 642
 643   private changeQuality () {
 644     const resolutionId = this.currentVideoFile.resolution.id
 645     const qualityLevels = this.player.qualityLevels()
 646
 647     if (resolutionId === -1) {
 648       qualityLevels.selectedIndex = -1
 649       return
 650     }
 651
 652     for (let i = 0; i < qualityLevels.length; i++) {
 653       const q = qualityLevels[i]
 654       if (q.height === resolutionId) qualityLevels.selectedIndex_ = i
 655     }
 656   }
 657 }
 658
 659 videojs.registerPlugin('webtorrent', WebTorrentPlugin)
 660 export { WebTorrentPlugin }