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.player.duration(options.videoDuration)
 115
 116       this.initializePlayer()
 117       this.runTorrentInfoScheduler()
 118       this.runViewAdd()
 119
 120       if (options.userWatching) this.runUserWatchVideo(options.userWatching)
 121
 122       this.player.one('play', () => {
 123         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 124         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 125       })
 126     })
 127
 128     this.player.on('volumechange', () => {
 129       saveVolumeInStore(this.player.volume())
 130       saveMuteInStore(this.player.muted())
 131     })
 132   }
 133
 134   dispose () {
 135     clearTimeout(this.addTorrentDelay)
 136     clearTimeout(this.qualityObservationTimer)
 137     clearTimeout(this.runAutoQualitySchedulerTimer)
 138
 139     clearInterval(this.videoViewInterval)
 140     clearInterval(this.torrentInfoInterval)
 141     clearInterval(this.autoQualityInterval)
 142
 143     if (this.userWatchingVideoInterval) clearInterval(this.userWatchingVideoInterval)
 144
 145     // Don't need to destroy renderer, video player will be destroyed
 146     this.flushVideoFile(this.currentVideoFile, false)
 147
 148     this.destroyFakeRenderer()
 149   }
 150
 151   getCurrentResolutionId () {
 152     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 153   }
 154
 155   getCurrentResolutionLabel () {
 156     if (!this.currentVideoFile) return ''
 157
 158     const fps = this.currentVideoFile.fps >= 50 ? this.currentVideoFile.fps : ''
 159     return this.currentVideoFile.resolution.label + fps
 160   }
 161
 162   updateVideoFile (
 163     videoFile?: VideoFile,
 164     options: {
 165       forcePlay?: boolean,
 166       seek?: number,
 167       delay?: number
 168     } = {},
 169     done: () => void = () => { /* empty */ }
 170   ) {
 171     // Automatically choose the adapted video file
 172     if (videoFile === undefined) {
 173       const savedAverageBandwidth = getAverageBandwidthInStore()
 174       videoFile = savedAverageBandwidth
 175         ? this.getAppropriateFile(savedAverageBandwidth)
 176         : this.pickAverageVideoFile()
 177     }
 178
 179     // Don't add the same video file once again
 180     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 181       return
 182     }
 183
 184     // Do not display error to user because we will have multiple fallback
 185     this.disableErrorDisplay()
 186
 187     // Hack to "simulate" src link in video.js >= 6
 188     // Without this, we can't play the video after pausing it
 189     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 190     this.player.src = () => true
 191     const oldPlaybackRate = this.player.playbackRate()
 192
 193     const previousVideoFile = this.currentVideoFile
 194     this.currentVideoFile = videoFile
 195
 196     // Don't try on iOS that does not support MediaSource
 197     // Or don't use P2P if webtorrent is disabled
 198     if (this.isIOS() || this.playerRefusedP2P) {
 199       return this.fallbackToHttp(options, () => {
 200         this.player.playbackRate(oldPlaybackRate)
 201         return done()
 202       })
 203     }
 204
 205     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 206       this.player.playbackRate(oldPlaybackRate)
 207       return done()
 208     })
 209
 210     this.trigger('videoFileUpdate')
 211   }
 212
 213   updateResolution (resolutionId: number, delay = 0) {
 214     // Remember player state
 215     const currentTime = this.player.currentTime()
 216     const isPaused = this.player.paused()
 217
 218     // Remove poster to have black background
 219     this.playerElement.poster = ''
 220
 221     // Hide bigPlayButton
 222     if (!isPaused) {
 223       this.player.bigPlayButton.hide()
 224     }
 225
 226     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 227     const options = {
 228       forcePlay: false,
 229       delay,
 230       seek: currentTime + (delay / 1000)
 231     }
 232     this.updateVideoFile(newVideoFile, options)
 233   }
 234
 235   flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
 236     if (videoFile !== undefined && this.webtorrent.get(videoFile.magnetUri)) {
 237       if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()
 238
 239       this.webtorrent.remove(videoFile.magnetUri)
 240       console.log('Removed ' + videoFile.magnetUri)
 241     }
 242   }
 243
 244   isAutoResolutionOn () {
 245     return this.autoResolution
 246   }
 247
 248   enableAutoResolution () {
 249     this.autoResolution = true
 250     this.trigger('autoResolutionUpdate')
 251   }
 252
 253   disableAutoResolution (forbid = false) {
 254     if (forbid === true) this.forbidAutoResolution = true
 255
 256     this.autoResolution = false
 257     this.trigger('autoResolutionUpdate')
 258   }
 259
 260   isAutoResolutionForbidden () {
 261     return this.forbidAutoResolution === true
 262   }
 263
 264   getCurrentVideoFile () {
 265     return this.currentVideoFile
 266   }
 267
 268   getTorrent () {
 269     return this.torrent
 270   }
 271
 272   private addTorrent (
 273     magnetOrTorrentUrl: string,
 274     previousVideoFile: VideoFile,
 275     options: PlayOptions,
 276     done: Function
 277   ) {
 278     console.log('Adding ' + magnetOrTorrentUrl + '.')
 279
 280     const oldTorrent = this.torrent
 281     const torrentOptions = {
 282       store: (chunkLength: number, storeOpts: any) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 283         max: 100
 284       })
 285     }
 286
 287     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 288       console.log('Added ' + magnetOrTorrentUrl + '.')
 289
 290       if (oldTorrent) {
 291         // Pause the old torrent
 292         this.stopTorrent(oldTorrent)
 293
 294         // We use a fake renderer so we download correct pieces of the next file
 295         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 296       }
 297
 298       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 299       this.addTorrentDelay = setTimeout(() => {
 300         // We don't need the fake renderer anymore
 301         this.destroyFakeRenderer()
 302
 303         const paused = this.player.paused()
 304
 305         this.flushVideoFile(previousVideoFile)
 306
 307         // Update progress bar (just for the UI), do not wait rendering
 308         if (options.seek) this.player.currentTime(options.seek)
 309
 310         const renderVideoOptions = { autoplay: false, controls: true }
 311         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 312           this.renderer = renderer
 313
 314           if (err) return this.fallbackToHttp(options, done)
 315
 316           return this.tryToPlay(err => {
 317             if (err) return done(err)
 318
 319             if (options.seek) this.seek(options.seek)
 320             if (options.forcePlay === false && paused === true) this.player.pause()
 321
 322             return done()
 323           })
 324         })
 325       }, options.delay || 0)
 326     })
 327
 328     this.torrent.on('error', (err: any) => console.error(err))
 329
 330     this.torrent.on('warning', (err: any) => {
 331       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 332       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 333
 334       // Users don't care about issues with WebRTC, but developers do so log it in the console
 335       if (err.message.indexOf('Ice connection failed') !== -1) {
 336         console.log(err)
 337         return
 338       }
 339
 340       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 341       if (err.message.indexOf('incorrect info hash') !== -1) {
 342         console.error('Incorrect info hash detected, falling back to torrent file.')
 343         const newOptions = { forcePlay: true, seek: options.seek }
 344         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 345       }
 346
 347       // Remote instance is down
 348       if (err.message.indexOf('from xs param') !== -1) {
 349         this.handleError(err)
 350       }
 351
 352       console.warn(err)
 353     })
 354   }
 355
 356   private tryToPlay (done?: (err?: Error) => void) {
 357     if (!done) done = function () { /* empty */ }
 358
 359     const playPromise = this.player.play()
 360     if (playPromise !== undefined) {
 361       return playPromise.then(done)
 362                         .catch((err: Error) => {
 363                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 364                             return
 365                           }
 366
 367                           console.error(err)
 368                           this.player.pause()
 369                           this.player.posterImage.show()
 370                           this.player.removeClass('vjs-has-autoplay')
 371                           this.player.removeClass('vjs-has-big-play-button-clicked')
 372
 373                           return done()
 374                         })
 375     }
 376
 377     return done()
 378   }
 379
 380   private seek (time: number) {
 381     this.player.currentTime(time)
 382     this.player.handleTechSeeked_()
 383   }
 384
 385   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 386     if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
 387     if (this.videoFiles.length === 1) return this.videoFiles[0]
 388
 389     // Don't change the torrent is the play was ended
 390     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 391
 392     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 393
 394     // Limit resolution according to player height
 395     const playerHeight = this.playerElement.offsetHeight as number
 396
 397     // We take the first resolution just above the player height
 398     // Example: player height is 530px, we want the 720p file instead of 480p
 399     let maxResolution = this.videoFiles[0].resolution.id
 400     for (let i = this.videoFiles.length - 1; i >= 0; i--) {
 401       const resolutionId = this.videoFiles[i].resolution.id
 402       if (resolutionId >= playerHeight) {
 403         maxResolution = resolutionId
 404         break
 405       }
 406     }
 407
 408     // Filter videos we can play according to our screen resolution and bandwidth
 409     const filteredFiles = this.videoFiles
 410                               .filter(f => f.resolution.id <= maxResolution)
 411                               .filter(f => {
 412                                 const fileBitrate = (f.size / this.videoDuration)
 413                                 let threshold = fileBitrate
 414
 415                                 // If this is for a higher resolution or an initial load: add a margin
 416                                 if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
 417                                   threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
 418                                 }
 419
 420                                 return averageDownloadSpeed > threshold
 421                               })
 422
 423     // If the download speed is too bad, return the lowest resolution we have
 424     if (filteredFiles.length === 0) return videoFileMinByResolution(this.videoFiles)
 425
 426     return videoFileMaxByResolution(filteredFiles)
 427   }
 428
 429   private getAndSaveActualDownloadSpeed () {
 430     const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
 431     const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
 432     if (lastDownloadSpeeds.length === 0) return -1
 433
 434     const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
 435     const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)
 436
 437     // Save the average bandwidth for future use
 438     saveAverageBandwidth(averageBandwidth)
 439
 440     return averageBandwidth
 441   }
 442
 443   private initializePlayer () {
 444     if (isMobile()) this.player.addClass('vjs-is-mobile')
 445
 446     this.initSmoothProgressBar()
 447
 448     this.initCaptions()
 449
 450     this.alterInactivity()
 451
 452     if (this.autoplay === true) {
 453       this.player.posterImage.hide()
 454
 455       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 456     }
 457
 458     // Proxy first play
 459     const oldPlay = this.player.play.bind(this.player)
 460     this.player.play = () => {
 461       this.player.addClass('vjs-has-big-play-button-clicked')
 462       this.player.play = oldPlay
 463
 464       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 465     }
 466   }
 467
 468   private runAutoQualityScheduler () {
 469     this.autoQualityInterval = setInterval(() => {
 470
 471       // Not initialized or in HTTP fallback
 472       if (this.torrent === undefined || this.torrent === null) return
 473       if (this.isAutoResolutionOn() === false) return
 474       if (this.isAutoResolutionObservation === true) return
 475
 476       const file = this.getAppropriateFile()
 477       let changeResolution = false
 478       let changeResolutionDelay = 0
 479
 480       // Lower resolution
 481       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 482         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 483         changeResolution = true
 484       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 485         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 486         changeResolution = true
 487         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 488       }
 489
 490       if (changeResolution === true) {
 491         this.updateResolution(file.resolution.id, changeResolutionDelay)
 492
 493         // Wait some seconds in observation of our new resolution
 494         this.isAutoResolutionObservation = true
 495
 496         this.qualityObservationTimer = setTimeout(() => {
 497           this.isAutoResolutionObservation = false
 498         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 499       }
 500     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 501   }
 502
 503   private isPlayerWaiting () {
 504     return this.player && this.player.hasClass('vjs-waiting')
 505   }
 506
 507   private runTorrentInfoScheduler () {
 508     this.torrentInfoInterval = setInterval(() => {
 509       // Not initialized yet
 510       if (this.torrent === undefined) return
 511
 512       // Http fallback
 513       if (this.torrent === null) return this.trigger('torrentInfo', false)
 514
 515       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 516       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 517
 518       return this.trigger('torrentInfo', {
 519         downloadSpeed: this.torrent.downloadSpeed,
 520         numPeers: this.torrent.numPeers,
 521         uploadSpeed: this.torrent.uploadSpeed,
 522         downloaded: this.torrent.downloaded,
 523         uploaded: this.torrent.uploaded
 524       })
 525     }, this.CONSTANTS.INFO_SCHEDULER)
 526   }
 527
 528   private runViewAdd () {
 529     this.clearVideoViewInterval()
 530
 531     // After 30 seconds (or 3/4 of the video), add a view to the video
 532     let minSecondsToView = 30
 533
 534     if (this.videoDuration < minSecondsToView) minSecondsToView = (this.videoDuration * 3) / 4
 535
 536     let secondsViewed = 0
 537     this.videoViewInterval = setInterval(() => {
 538       if (this.player && !this.player.paused()) {
 539         secondsViewed += 1
 540
 541         if (secondsViewed > minSecondsToView) {
 542           this.clearVideoViewInterval()
 543
 544           this.addViewToVideo().catch(err => console.error(err))
 545         }
 546       }
 547     }, 1000)
 548   }
 549
 550   private runUserWatchVideo (options: UserWatching) {
 551     let lastCurrentTime = 0
 552
 553     this.userWatchingVideoInterval = setInterval(() => {
 554       const currentTime = Math.floor(this.player.currentTime())
 555
 556       if (currentTime - lastCurrentTime >= 1) {
 557         lastCurrentTime = currentTime
 558
 559         this.notifyUserIsWatching(currentTime, options.url, options.authorizationHeader)
 560           .catch(err => console.error('Cannot notify user is watching.', err))
 561       }
 562     }, this.CONSTANTS.USER_WATCHING_VIDEO_INTERVAL)
 563   }
 564
 565   private clearVideoViewInterval () {
 566     if (this.videoViewInterval !== undefined) {
 567       clearInterval(this.videoViewInterval)
 568       this.videoViewInterval = undefined
 569     }
 570   }
 571
 572   private addViewToVideo () {
 573     if (!this.videoViewUrl) return Promise.resolve(undefined)
 574
 575     return fetch(this.videoViewUrl, { method: 'POST' })
 576   }
 577
 578   private notifyUserIsWatching (currentTime: number, url: string, authorizationHeader: string) {
 579     const body = new URLSearchParams()
 580     body.append('currentTime', currentTime.toString())
 581
 582     const headers = new Headers({ 'Authorization': authorizationHeader })
 583
 584     return fetch(url, { method: 'PUT', body, headers })
 585   }
 586
 587   private fallbackToHttp (options: PlayOptions, done?: Function) {
 588     const paused = this.player.paused()
 589
 590     this.disableAutoResolution(true)
 591
 592     this.flushVideoFile(this.currentVideoFile, true)
 593     this.torrent = null
 594
 595     // Enable error display now this is our last fallback
 596     this.player.one('error', () => this.enableErrorDisplay())
 597
 598     const httpUrl = this.currentVideoFile.fileUrl
 599     this.player.src = this.savePlayerSrcFunction
 600     this.player.src(httpUrl)
 601
 602     return this.tryToPlay(err => {
 603       if (err && done) return done(err)
 604
 605       if (options.seek) this.seek(options.seek)
 606       if (options.forcePlay === false && paused === true) this.player.pause()
 607
 608       if (done) return done()
 609     })
 610   }
 611
 612   private handleError (err: Error | string) {
 613     return this.player.trigger('customError', { err })
 614   }
 615
 616   private enableErrorDisplay () {
 617     this.player.addClass('vjs-error-display-enabled')
 618   }
 619
 620   private disableErrorDisplay () {
 621     this.player.removeClass('vjs-error-display-enabled')
 622   }
 623
 624   private isIOS () {
 625     return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
 626   }
 627
 628   private alterInactivity () {
 629     let saveInactivityTimeout: number
 630
 631     const disableInactivity = () => {
 632       saveInactivityTimeout = this.player.options_.inactivityTimeout
 633       this.player.options_.inactivityTimeout = 0
 634     }
 635     const enableInactivity = () => {
 636       this.player.options_.inactivityTimeout = saveInactivityTimeout
 637     }
 638
 639     const settingsDialog = this.player.children_.find((c: any) => c.name_ === 'SettingsDialog')
 640
 641     this.player.controlBar.on('mouseenter', () => disableInactivity())
 642     settingsDialog.on('mouseenter', () => disableInactivity())
 643     this.player.controlBar.on('mouseleave', () => enableInactivity())
 644     settingsDialog.on('mouseleave', () => enableInactivity())
 645   }
 646
 647   private pickAverageVideoFile () {
 648     if (this.videoFiles.length === 1) return this.videoFiles[0]
 649
 650     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 651   }
 652
 653   private stopTorrent (torrent: WebTorrent.Torrent) {
 654     torrent.pause()
 655     // Pause does not remove actual peers (in particular the webseed peer)
 656     torrent.removePeer(torrent[ 'ws' ])
 657   }
 658
 659   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 660     this.destoyingFakeRenderer = false
 661
 662     const fakeVideoElem = document.createElement('video')
 663     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 664       this.fakeRenderer = renderer
 665
 666       // The renderer returns an error when we destroy it, so skip them
 667       if (this.destoyingFakeRenderer === false && err) {
 668         console.error('Cannot render new torrent in fake video element.', err)
 669       }
 670
 671       // Load the future file at the correct time (in delay MS - 2 seconds)
 672       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 673     })
 674   }
 675
 676   private destroyFakeRenderer () {
 677     if (this.fakeRenderer) {
 678       this.destoyingFakeRenderer = true
 679
 680       if (this.fakeRenderer.destroy) {
 681         try {
 682           this.fakeRenderer.destroy()
 683         } catch (err) {
 684           console.log('Cannot destroy correctly fake renderer.', err)
 685         }
 686       }
 687       this.fakeRenderer = undefined
 688     }
 689   }
 690
 691   private initCaptions () {
 692     for (const caption of this.videoCaptions) {
 693       this.player.addRemoteTextTrack({
 694         kind: 'captions',
 695         label: caption.label,
 696         language: caption.language,
 697         id: caption.language,
 698         src: caption.src
 699       }, false)
 700     }
 701   }
 702
 703   // Thanks: https://github.com/videojs/video.js/issues/4460#issuecomment-312861657
 704   private initSmoothProgressBar () {
 705     const SeekBar = videojsUntyped.getComponent('SeekBar')
 706     SeekBar.prototype.getPercent = function getPercent () {
 707       // Allows for smooth scrubbing, when player can't keep up.
 708       // const time = (this.player_.scrubbing()) ?
 709       //   this.player_.getCache().currentTime :
 710       //   this.player_.currentTime()
 711       const time = this.player_.currentTime()
 712       const percent = time / this.player_.duration()
 713       return percent >= 1 ? 1 : percent
 714     }
 715     SeekBar.prototype.handleMouseMove = function handleMouseMove (event: any) {
 716       let newTime = this.calculateDistance(event) * this.player_.duration()
 717       if (newTime === this.player_.duration()) {
 718         newTime = newTime - 0.1
 719       }
 720       this.player_.currentTime(newTime)
 721       this.update()
 722     }
 723   }
 724 }
 725
 726 videojs.registerPlugin('peertube', PeerTubePlugin)
 727 export { PeerTubePlugin }