client/src/assets/player/peertube-videojs-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 './settings-menu-button'
   9 import { PeertubePluginOptions, UserWatching, VideoJSCaption, VideoJSComponentInterface, videojsUntyped } from './peertube-videojs-typings'
  10 import { isMobile, timeToInt, videoFileMaxByResolution, videoFileMinByResolution } from './utils'
  11 import { PeertubeChunkStore } from './peertube-chunk-store'
  12 import {
  13   getAverageBandwidthInStore,
  14   getStoredMute,
  15   getStoredVolume,
  16   getStoredWebTorrentEnabled,
  17   saveAverageBandwidth,
  18   saveMuteInStore,
  19   saveVolumeInStore
  20 } from './peertube-player-local-storage'
  21
  22 const CacheChunkStore = require('cache-chunk-store')
  23
  24 type PlayOptions = {
  25   forcePlay?: boolean,
  26   seek?: number,
  27   delay?: number
  28 }
  29
  30 const Plugin: VideoJSComponentInterface = videojs.getPlugin('plugin')
  31 class PeerTubePlugin extends Plugin {
  32   private readonly playerElement: HTMLVideoElement
  33
  34   private readonly autoplay: boolean = false
  35   private readonly startTime: number = 0
  36   private readonly savePlayerSrcFunction: Function
  37   private readonly videoFiles: VideoFile[]
  38   private readonly videoViewUrl: string
  39   private readonly videoDuration: number
  40   private readonly CONSTANTS = {
  41     INFO_SCHEDULER: 1000, // Don't change this
  42     AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
  43     AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
  44     AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
  45     AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
  46     BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5, // Last 5 seconds to build average bandwidth
  47     USER_WATCHING_VIDEO_INTERVAL: 5000 // Every 5 seconds, notify the user is watching the video
  48   }
  49
  50   private readonly webtorrent = new WebTorrent({
  51     tracker: {
  52       rtcConfig: {
  53         iceServers: [
  54           {
  55             urls: 'stun:stun.stunprotocol.org'
  56           },
  57           {
  58             urls: 'stun:stun.framasoft.org'
  59           }
  60         ]
  61       }
  62     },
  63     dht: false
  64   })
  65
  66   private player: any
  67   private currentVideoFile: VideoFile
  68   private torrent: WebTorrent.Torrent
  69   private videoCaptions: VideoJSCaption[]
  70
  71   private renderer: any
  72   private fakeRenderer: any
  73   private destoyingFakeRenderer = false
  74
  75   private autoResolution = true
  76   private forbidAutoResolution = false
  77   private isAutoResolutionObservation = false
  78   private playerRefusedP2P = false
  79
  80   private videoViewInterval: any
  81   private torrentInfoInterval: any
  82   private autoQualityInterval: any
  83   private userWatchingVideoInterval: any
  84   private addTorrentDelay: any
  85   private qualityObservationTimer: any
  86   private runAutoQualitySchedulerTimer: any
  87
  88   private downloadSpeeds: number[] = []
  89
  90   constructor (player: videojs.Player, options: PeertubePluginOptions) {
  91     super(player, options)
  92
  93     // Disable auto play on iOS
  94     this.autoplay = options.autoplay && this.isIOS() === false
  95     this.playerRefusedP2P = !getStoredWebTorrentEnabled()
  96
  97     this.startTime = timeToInt(options.startTime)
  98     this.videoFiles = options.videoFiles
  99     this.videoViewUrl = options.videoViewUrl
 100     this.videoDuration = options.videoDuration
 101     this.videoCaptions = options.videoCaptions
 102
 103     this.savePlayerSrcFunction = this.player.src
 104     this.playerElement = options.playerElement
 105
 106     if (this.autoplay === true) this.player.addClass('vjs-has-autoplay')
 107
 108     this.player.ready(() => {
 109       const volume = getStoredVolume()
 110       if (volume !== undefined) this.player.volume(volume)
 111       const muted = getStoredMute()
 112       if (muted !== undefined) this.player.muted(muted)
 113
 114       this.initializePlayer()
 115       this.runTorrentInfoScheduler()
 116       this.runViewAdd()
 117
 118       if (options.userWatching) this.runUserWatchVideo(options.userWatching)
 119
 120       this.player.one('play', () => {
 121         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 122         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 123       })
 124     })
 125
 126     this.player.on('volumechange', () => {
 127       saveVolumeInStore(this.player.volume())
 128       saveMuteInStore(this.player.muted())
 129     })
 130   }
 131
 132   dispose () {
 133     clearTimeout(this.addTorrentDelay)
 134     clearTimeout(this.qualityObservationTimer)
 135     clearTimeout(this.runAutoQualitySchedulerTimer)
 136
 137     clearInterval(this.videoViewInterval)
 138     clearInterval(this.torrentInfoInterval)
 139     clearInterval(this.autoQualityInterval)
 140
 141     if (this.userWatchingVideoInterval) clearInterval(this.userWatchingVideoInterval)
 142
 143     // Don't need to destroy renderer, video player will be destroyed
 144     this.flushVideoFile(this.currentVideoFile, false)
 145
 146     this.destroyFakeRenderer()
 147   }
 148
 149   getCurrentResolutionId () {
 150     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 151   }
 152
 153   getCurrentResolutionLabel () {
 154     if (!this.currentVideoFile) return ''
 155
 156     const fps = this.currentVideoFile.fps >= 50 ? this.currentVideoFile.fps : ''
 157     return this.currentVideoFile.resolution.label + fps
 158   }
 159
 160   updateVideoFile (
 161     videoFile?: VideoFile,
 162     options: {
 163       forcePlay?: boolean,
 164       seek?: number,
 165       delay?: number
 166     } = {},
 167     done: () => void = () => { /* empty */ }
 168   ) {
 169     // Automatically choose the adapted video file
 170     if (videoFile === undefined) {
 171       const savedAverageBandwidth = getAverageBandwidthInStore()
 172       videoFile = savedAverageBandwidth
 173         ? this.getAppropriateFile(savedAverageBandwidth)
 174         : this.pickAverageVideoFile()
 175     }
 176
 177     // Don't add the same video file once again
 178     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 179       return
 180     }
 181
 182     // Do not display error to user because we will have multiple fallback
 183     this.disableErrorDisplay()
 184
 185     // Hack to "simulate" src link in video.js >= 6
 186     // Without this, we can't play the video after pausing it
 187     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 188     this.player.src = () => true
 189     const oldPlaybackRate = this.player.playbackRate()
 190
 191     const previousVideoFile = this.currentVideoFile
 192     this.currentVideoFile = videoFile
 193
 194     // Don't try on iOS that does not support MediaSource
 195     // Or don't use P2P if webtorrent is disabled
 196     if (this.isIOS() || this.playerRefusedP2P) {
 197       return this.fallbackToHttp(options, () => {
 198         this.player.playbackRate(oldPlaybackRate)
 199         return done()
 200       })
 201     }
 202
 203     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 204       this.player.playbackRate(oldPlaybackRate)
 205       return done()
 206     })
 207
 208     this.trigger('videoFileUpdate')
 209   }
 210
 211   updateResolution (resolutionId: number, delay = 0) {
 212     // Remember player state
 213     const currentTime = this.player.currentTime()
 214     const isPaused = this.player.paused()
 215
 216     // Remove poster to have black background
 217     this.playerElement.poster = ''
 218
 219     // Hide bigPlayButton
 220     if (!isPaused) {
 221       this.player.bigPlayButton.hide()
 222     }
 223
 224     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 225     const options = {
 226       forcePlay: false,
 227       delay,
 228       seek: currentTime + (delay / 1000)
 229     }
 230     this.updateVideoFile(newVideoFile, options)
 231   }
 232
 233   flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
 234     if (videoFile !== undefined && this.webtorrent.get(videoFile.magnetUri)) {
 235       if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()
 236
 237       this.webtorrent.remove(videoFile.magnetUri)
 238       console.log('Removed ' + videoFile.magnetUri)
 239     }
 240   }
 241
 242   isAutoResolutionOn () {
 243     return this.autoResolution
 244   }
 245
 246   enableAutoResolution () {
 247     this.autoResolution = true
 248     this.trigger('autoResolutionUpdate')
 249   }
 250
 251   disableAutoResolution (forbid = false) {
 252     if (forbid === true) this.forbidAutoResolution = true
 253
 254     this.autoResolution = false
 255     this.trigger('autoResolutionUpdate')
 256   }
 257
 258   isAutoResolutionForbidden () {
 259     return this.forbidAutoResolution === true
 260   }
 261
 262   getCurrentVideoFile () {
 263     return this.currentVideoFile
 264   }
 265
 266   getTorrent () {
 267     return this.torrent
 268   }
 269
 270   private addTorrent (
 271     magnetOrTorrentUrl: string,
 272     previousVideoFile: VideoFile,
 273     options: PlayOptions,
 274     done: Function
 275   ) {
 276     console.log('Adding ' + magnetOrTorrentUrl + '.')
 277
 278     const oldTorrent = this.torrent
 279     const torrentOptions = {
 280       store: (chunkLength: number, storeOpts: any) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 281         max: 100
 282       })
 283     }
 284
 285     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 286       console.log('Added ' + magnetOrTorrentUrl + '.')
 287
 288       if (oldTorrent) {
 289         // Pause the old torrent
 290         this.stopTorrent(oldTorrent)
 291
 292         // We use a fake renderer so we download correct pieces of the next file
 293         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 294       }
 295
 296       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 297       this.addTorrentDelay = setTimeout(() => {
 298         // We don't need the fake renderer anymore
 299         this.destroyFakeRenderer()
 300
 301         const paused = this.player.paused()
 302
 303         this.flushVideoFile(previousVideoFile)
 304
 305         const renderVideoOptions = { autoplay: false, controls: true }
 306         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 307           this.renderer = renderer
 308
 309           if (err) return this.fallbackToHttp(options, done)
 310
 311           return this.tryToPlay(err => {
 312             if (err) return done(err)
 313
 314             if (options.seek) this.seek(options.seek)
 315             if (options.forcePlay === false && paused === true) this.player.pause()
 316
 317             return done()
 318           })
 319         })
 320       }, options.delay || 0)
 321     })
 322
 323     this.torrent.on('error', (err: any) => console.error(err))
 324
 325     this.torrent.on('warning', (err: any) => {
 326       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 327       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 328
 329       // Users don't care about issues with WebRTC, but developers do so log it in the console
 330       if (err.message.indexOf('Ice connection failed') !== -1) {
 331         console.log(err)
 332         return
 333       }
 334
 335       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 336       if (err.message.indexOf('incorrect info hash') !== -1) {
 337         console.error('Incorrect info hash detected, falling back to torrent file.')
 338         const newOptions = { forcePlay: true, seek: options.seek }
 339         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 340       }
 341
 342       // Remote instance is down
 343       if (err.message.indexOf('from xs param') !== -1) {
 344         this.handleError(err)
 345       }
 346
 347       console.warn(err)
 348     })
 349   }
 350
 351   private tryToPlay (done?: (err?: Error) => void) {
 352     if (!done) done = function () { /* empty */ }
 353
 354     const playPromise = this.player.play()
 355     if (playPromise !== undefined) {
 356       return playPromise.then(done)
 357                         .catch((err: Error) => {
 358                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 359                             return
 360                           }
 361
 362                           console.error(err)
 363                           this.player.pause()
 364                           this.player.posterImage.show()
 365                           this.player.removeClass('vjs-has-autoplay')
 366                           this.player.removeClass('vjs-has-big-play-button-clicked')
 367
 368                           return done()
 369                         })
 370     }
 371
 372     return done()
 373   }
 374
 375   private seek (time: number) {
 376     this.player.currentTime(time)
 377     this.player.handleTechSeeked_()
 378   }
 379
 380   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 381     if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
 382     if (this.videoFiles.length === 1) return this.videoFiles[0]
 383
 384     // Don't change the torrent is the play was ended
 385     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 386
 387     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 388
 389     // Limit resolution according to player height
 390     const playerHeight = this.playerElement.offsetHeight as number
 391
 392     // We take the first resolution just above the player height
 393     // Example: player height is 530px, we want the 720p file instead of 480p
 394     let maxResolution = this.videoFiles[0].resolution.id
 395     for (let i = this.videoFiles.length - 1; i >= 0; i--) {
 396       const resolutionId = this.videoFiles[i].resolution.id
 397       if (resolutionId >= playerHeight) {
 398         maxResolution = resolutionId
 399         break
 400       }
 401     }
 402
 403     // Filter videos we can play according to our screen resolution and bandwidth
 404     const filteredFiles = this.videoFiles
 405                               .filter(f => f.resolution.id <= maxResolution)
 406                               .filter(f => {
 407                                 const fileBitrate = (f.size / this.videoDuration)
 408                                 let threshold = fileBitrate
 409
 410                                 // If this is for a higher resolution or an initial load: add a margin
 411                                 if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
 412                                   threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
 413                                 }
 414
 415                                 return averageDownloadSpeed > threshold
 416                               })
 417
 418     // If the download speed is too bad, return the lowest resolution we have
 419     if (filteredFiles.length === 0) return videoFileMinByResolution(this.videoFiles)
 420
 421     return videoFileMaxByResolution(filteredFiles)
 422   }
 423
 424   private getAndSaveActualDownloadSpeed () {
 425     const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
 426     const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
 427     if (lastDownloadSpeeds.length === 0) return -1
 428
 429     const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
 430     const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)
 431
 432     // Save the average bandwidth for future use
 433     saveAverageBandwidth(averageBandwidth)
 434
 435     return averageBandwidth
 436   }
 437
 438   private initializePlayer () {
 439     if (isMobile()) this.player.addClass('vjs-is-mobile')
 440
 441     this.initSmoothProgressBar()
 442
 443     this.initCaptions()
 444
 445     this.alterInactivity()
 446
 447     if (this.autoplay === true) {
 448       this.player.posterImage.hide()
 449
 450       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 451     }
 452
 453     // Proxy first play
 454     const oldPlay = this.player.play.bind(this.player)
 455     this.player.play = () => {
 456       this.player.addClass('vjs-has-big-play-button-clicked')
 457       this.player.play = oldPlay
 458
 459       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 460     }
 461   }
 462
 463   private runAutoQualityScheduler () {
 464     this.autoQualityInterval = setInterval(() => {
 465
 466       // Not initialized or in HTTP fallback
 467       if (this.torrent === undefined || this.torrent === null) return
 468       if (this.isAutoResolutionOn() === false) return
 469       if (this.isAutoResolutionObservation === true) return
 470
 471       const file = this.getAppropriateFile()
 472       let changeResolution = false
 473       let changeResolutionDelay = 0
 474
 475       // Lower resolution
 476       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 477         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 478         changeResolution = true
 479       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 480         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 481         changeResolution = true
 482         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 483       }
 484
 485       if (changeResolution === true) {
 486         this.updateResolution(file.resolution.id, changeResolutionDelay)
 487
 488         // Wait some seconds in observation of our new resolution
 489         this.isAutoResolutionObservation = true
 490
 491         this.qualityObservationTimer = setTimeout(() => {
 492           this.isAutoResolutionObservation = false
 493         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 494       }
 495     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 496   }
 497
 498   private isPlayerWaiting () {
 499     return this.player && this.player.hasClass('vjs-waiting')
 500   }
 501
 502   private runTorrentInfoScheduler () {
 503     this.torrentInfoInterval = setInterval(() => {
 504       // Not initialized yet
 505       if (this.torrent === undefined) return
 506
 507       // Http fallback
 508       if (this.torrent === null) return this.trigger('torrentInfo', false)
 509
 510       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 511       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 512
 513       return this.trigger('torrentInfo', {
 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     }, this.CONSTANTS.INFO_SCHEDULER)
 521   }
 522
 523   private runViewAdd () {
 524     this.clearVideoViewInterval()
 525
 526     // After 30 seconds (or 3/4 of the video), add a view to the video
 527     let minSecondsToView = 30
 528
 529     if (this.videoDuration < minSecondsToView) minSecondsToView = (this.videoDuration * 3) / 4
 530
 531     let secondsViewed = 0
 532     this.videoViewInterval = setInterval(() => {
 533       if (this.player && !this.player.paused()) {
 534         secondsViewed += 1
 535
 536         if (secondsViewed > minSecondsToView) {
 537           this.clearVideoViewInterval()
 538
 539           this.addViewToVideo().catch(err => console.error(err))
 540         }
 541       }
 542     }, 1000)
 543   }
 544
 545   private runUserWatchVideo (options: UserWatching) {
 546     let lastCurrentTime = 0
 547
 548     this.userWatchingVideoInterval = setInterval(() => {
 549       const currentTime = Math.floor(this.player.currentTime())
 550
 551       if (currentTime - lastCurrentTime >= 1) {
 552         lastCurrentTime = currentTime
 553
 554         this.notifyUserIsWatching(currentTime, options.url, options.authorizationHeader)
 555           .catch(err => console.error('Cannot notify user is watching.', err))
 556       }
 557     }, this.CONSTANTS.USER_WATCHING_VIDEO_INTERVAL)
 558   }
 559
 560   private clearVideoViewInterval () {
 561     if (this.videoViewInterval !== undefined) {
 562       clearInterval(this.videoViewInterval)
 563       this.videoViewInterval = undefined
 564     }
 565   }
 566
 567   private addViewToVideo () {
 568     if (!this.videoViewUrl) return Promise.resolve(undefined)
 569
 570     return fetch(this.videoViewUrl, { method: 'POST' })
 571   }
 572
 573   private notifyUserIsWatching (currentTime: number, url: string, authorizationHeader: string) {
 574     const body = new URLSearchParams()
 575     body.append('currentTime', currentTime.toString())
 576
 577     const headers = new Headers({ 'Authorization': authorizationHeader })
 578
 579     return fetch(url, { method: 'PUT', body, headers })
 580   }
 581
 582   private fallbackToHttp (options: PlayOptions, done?: Function) {
 583     const paused = this.player.paused()
 584
 585     this.disableAutoResolution(true)
 586
 587     this.flushVideoFile(this.currentVideoFile, true)
 588     this.torrent = null
 589
 590     // Enable error display now this is our last fallback
 591     this.player.one('error', () => this.enableErrorDisplay())
 592
 593     const httpUrl = this.currentVideoFile.fileUrl
 594     this.player.src = this.savePlayerSrcFunction
 595     this.player.src(httpUrl)
 596
 597     return this.tryToPlay(err => {
 598       if (err && done) return done(err)
 599
 600       if (options.seek) this.seek(options.seek)
 601       if (options.forcePlay === false && paused === true) this.player.pause()
 602
 603       if (done) return done()
 604     })
 605   }
 606
 607   private handleError (err: Error | string) {
 608     return this.player.trigger('customError', { err })
 609   }
 610
 611   private enableErrorDisplay () {
 612     this.player.addClass('vjs-error-display-enabled')
 613   }
 614
 615   private disableErrorDisplay () {
 616     this.player.removeClass('vjs-error-display-enabled')
 617   }
 618
 619   private isIOS () {
 620     return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
 621   }
 622
 623   private alterInactivity () {
 624     let saveInactivityTimeout: number
 625
 626     const disableInactivity = () => {
 627       saveInactivityTimeout = this.player.options_.inactivityTimeout
 628       this.player.options_.inactivityTimeout = 0
 629     }
 630     const enableInactivity = () => {
 631       this.player.options_.inactivityTimeout = saveInactivityTimeout
 632     }
 633
 634     const settingsDialog = this.player.children_.find((c: any) => c.name_ === 'SettingsDialog')
 635
 636     this.player.controlBar.on('mouseenter', () => disableInactivity())
 637     settingsDialog.on('mouseenter', () => disableInactivity())
 638     this.player.controlBar.on('mouseleave', () => enableInactivity())
 639     settingsDialog.on('mouseleave', () => enableInactivity())
 640   }
 641
 642   private pickAverageVideoFile () {
 643     if (this.videoFiles.length === 1) return this.videoFiles[0]
 644
 645     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 646   }
 647
 648   private stopTorrent (torrent: WebTorrent.Torrent) {
 649     torrent.pause()
 650     // Pause does not remove actual peers (in particular the webseed peer)
 651     torrent.removePeer(torrent[ 'ws' ])
 652   }
 653
 654   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 655     this.destoyingFakeRenderer = false
 656
 657     const fakeVideoElem = document.createElement('video')
 658     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 659       this.fakeRenderer = renderer
 660
 661       // The renderer returns an error when we destroy it, so skip them
 662       if (this.destoyingFakeRenderer === false && err) {
 663         console.error('Cannot render new torrent in fake video element.', err)
 664       }
 665
 666       // Load the future file at the correct time (in delay MS - 2 seconds)
 667       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 668     })
 669   }
 670
 671   private destroyFakeRenderer () {
 672     if (this.fakeRenderer) {
 673       this.destoyingFakeRenderer = true
 674
 675       if (this.fakeRenderer.destroy) {
 676         try {
 677           this.fakeRenderer.destroy()
 678         } catch (err) {
 679           console.log('Cannot destroy correctly fake renderer.', err)
 680         }
 681       }
 682       this.fakeRenderer = undefined
 683     }
 684   }
 685
 686   private initCaptions () {
 687     for (const caption of this.videoCaptions) {
 688       this.player.addRemoteTextTrack({
 689         kind: 'captions',
 690         label: caption.label,
 691         language: caption.language,
 692         id: caption.language,
 693         src: caption.src
 694       }, false)
 695     }
 696   }
 697
 698   // Thanks: https://github.com/videojs/video.js/issues/4460#issuecomment-312861657
 699   private initSmoothProgressBar () {
 700     const SeekBar = videojsUntyped.getComponent('SeekBar')
 701     SeekBar.prototype.getPercent = function getPercent () {
 702       // Allows for smooth scrubbing, when player can't keep up.
 703       // const time = (this.player_.scrubbing()) ?
 704       //   this.player_.getCache().currentTime :
 705       //   this.player_.currentTime()
 706       const time = this.player_.currentTime()
 707       const percent = time / this.player_.duration()
 708       return percent >= 1 ? 1 : percent
 709     }
 710     SeekBar.prototype.handleMouseMove = function handleMouseMove (event: any) {
 711       let newTime = this.calculateDistance(event) * this.player_.duration()
 712       if (newTime === this.player_.duration()) {
 713         newTime = newTime - 0.1
 714       }
 715       this.player_.currentTime(newTime)
 716       this.update()
 717     }
 718   }
 719 }
 720
 721 videojs.registerPlugin('peertube', PeerTubePlugin)
 722 export { PeerTubePlugin }