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

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