client/src/assets/player/peertube-videojs-plugin.ts

   1 import * as videojs from 'video.js'
   2 import * as WebTorrent from 'webtorrent'
   3 import { VideoFile } from '../../../../shared/models/videos/video.model'
   4 import { renderVideo } from './video-renderer'
   5 import './settings-menu-button'
   6 import { PeertubePluginOptions, UserWatching, VideoJSCaption, VideoJSComponentInterface, videojsUntyped } from './peertube-videojs-typings'
   7 import { isMobile, timeToInt, videoFileMaxByResolution, videoFileMinByResolution } from './utils'
   8 import * as CacheChunkStore from 'cache-chunk-store'
   9 import { PeertubeChunkStore } from './peertube-chunk-store'
  10 import {
  11   getAverageBandwidthInStore,
  12   getStoredMute,
  13   getStoredVolume,
  14   saveAverageBandwidth,
  15   saveMuteInStore,
  16   saveVolumeInStore
  17 } from './peertube-player-local-storage'
  18
  19 const Plugin: VideoJSComponentInterface = videojs.getPlugin('plugin')
  20 class PeerTubePlugin extends Plugin {
  21   private readonly playerElement: HTMLVideoElement
  22
  23   private readonly autoplay: boolean = false
  24   private readonly startTime: number = 0
  25   private readonly savePlayerSrcFunction: Function
  26   private readonly videoFiles: VideoFile[]
  27   private readonly videoViewUrl: string
  28   private readonly videoDuration: number
  29   private readonly CONSTANTS = {
  30     INFO_SCHEDULER: 1000, // Don't change this
  31     AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
  32     AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
  33     AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
  34     AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
  35     BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5, // Last 5 seconds to build average bandwidth
  36     USER_WATCHING_VIDEO_INTERVAL: 5000 // Every 5 seconds, notify the user is watching the video
  37   }
  38
  39   private readonly webtorrent = new WebTorrent({
  40     tracker: {
  41       rtcConfig: {
  42         iceServers: [
  43           {
  44             urls: 'stun:stun.stunprotocol.org'
  45           },
  46           {
  47             urls: 'stun:stun.framasoft.org'
  48           }
  49         ]
  50       }
  51     },
  52     dht: false
  53   })
  54
  55   private player: any
  56   private currentVideoFile: VideoFile
  57   private torrent: WebTorrent.Torrent
  58   private videoCaptions: VideoJSCaption[]
  59
  60   private renderer
  61   private fakeRenderer
  62   private destoyingFakeRenderer = false
  63
  64   private autoResolution = true
  65   private forbidAutoResolution = false
  66   private isAutoResolutionObservation = false
  67
  68   private videoViewInterval
  69   private torrentInfoInterval
  70   private autoQualityInterval
  71   private userWatchingVideoInterval
  72   private addTorrentDelay
  73   private qualityObservationTimer
  74   private runAutoQualitySchedulerTimer
  75
  76   private downloadSpeeds: number[] = []
  77
  78   constructor (player: videojs.Player, options: PeertubePluginOptions) {
  79     super(player, options)
  80
  81     // Disable auto play on iOS
  82     this.autoplay = options.autoplay && this.isIOS() === false
  83
  84     this.startTime = timeToInt(options.startTime)
  85     this.videoFiles = options.videoFiles
  86     this.videoViewUrl = options.videoViewUrl
  87     this.videoDuration = options.videoDuration
  88     this.videoCaptions = options.videoCaptions
  89
  90     this.savePlayerSrcFunction = this.player.src
  91     this.playerElement = options.playerElement
  92
  93     if (this.autoplay === true) this.player.addClass('vjs-has-autoplay')
  94
  95     this.player.ready(() => {
  96       const volume = getStoredVolume()
  97       if (volume !== undefined) this.player.volume(volume)
  98       const muted = getStoredMute()
  99       if (muted !== undefined) this.player.muted(muted)
 100
 101       this.initializePlayer()
 102       this.runTorrentInfoScheduler()
 103       this.runViewAdd()
 104
 105       if (options.userWatching) this.runUserWatchVideo(options.userWatching)
 106
 107       this.player.one('play', () => {
 108         // Don't run immediately scheduler, wait some seconds the TCP connections are made
 109         this.runAutoQualitySchedulerTimer = setTimeout(() => this.runAutoQualityScheduler(), this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 110       })
 111     })
 112
 113     this.player.on('volumechange', () => {
 114       saveVolumeInStore(this.player.volume())
 115       saveMuteInStore(this.player.muted())
 116     })
 117   }
 118
 119   dispose () {
 120     clearTimeout(this.addTorrentDelay)
 121     clearTimeout(this.qualityObservationTimer)
 122     clearTimeout(this.runAutoQualitySchedulerTimer)
 123
 124     clearInterval(this.videoViewInterval)
 125     clearInterval(this.torrentInfoInterval)
 126     clearInterval(this.autoQualityInterval)
 127
 128     if (this.userWatchingVideoInterval) clearInterval(this.userWatchingVideoInterval)
 129
 130     // Don't need to destroy renderer, video player will be destroyed
 131     this.flushVideoFile(this.currentVideoFile, false)
 132
 133     this.destroyFakeRenderer()
 134   }
 135
 136   getCurrentResolutionId () {
 137     return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
 138   }
 139
 140   getCurrentResolutionLabel () {
 141     if (!this.currentVideoFile) return ''
 142
 143     const fps = this.currentVideoFile.fps >= 50 ? this.currentVideoFile.fps : ''
 144     return this.currentVideoFile.resolution.label + fps
 145   }
 146
 147   updateVideoFile (
 148     videoFile?: VideoFile,
 149     options: {
 150       forcePlay?: boolean,
 151       seek?: number,
 152       delay?: number
 153     } = {},
 154     done: () => void = () => { /* empty */ }
 155   ) {
 156     // Automatically choose the adapted video file
 157     if (videoFile === undefined) {
 158       const savedAverageBandwidth = getAverageBandwidthInStore()
 159       videoFile = savedAverageBandwidth
 160         ? this.getAppropriateFile(savedAverageBandwidth)
 161         : this.pickAverageVideoFile()
 162     }
 163
 164     // Don't add the same video file once again
 165     if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
 166       return
 167     }
 168
 169     // Do not display error to user because we will have multiple fallback
 170     this.disableErrorDisplay()
 171
 172     // Hack to "simulate" src link in video.js >= 6
 173     // Without this, we can't play the video after pausing it
 174     // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
 175     this.player.src = () => true
 176     const oldPlaybackRate = this.player.playbackRate()
 177
 178     const previousVideoFile = this.currentVideoFile
 179     this.currentVideoFile = videoFile
 180
 181     this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
 182       this.player.playbackRate(oldPlaybackRate)
 183       return done()
 184     })
 185
 186     this.trigger('videoFileUpdate')
 187   }
 188
 189   updateResolution (resolutionId: number, delay = 0) {
 190     // Remember player state
 191     const currentTime = this.player.currentTime()
 192     const isPaused = this.player.paused()
 193
 194     // Remove poster to have black background
 195     this.playerElement.poster = ''
 196
 197     // Hide bigPlayButton
 198     if (!isPaused) {
 199       this.player.bigPlayButton.hide()
 200     }
 201
 202     const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
 203     const options = {
 204       forcePlay: false,
 205       delay,
 206       seek: currentTime + (delay / 1000)
 207     }
 208     this.updateVideoFile(newVideoFile, options)
 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       console.log('Removed ' + videoFile.magnetUri)
 217     }
 218   }
 219
 220   isAutoResolutionOn () {
 221     return this.autoResolution
 222   }
 223
 224   enableAutoResolution () {
 225     this.autoResolution = true
 226     this.trigger('autoResolutionUpdate')
 227   }
 228
 229   disableAutoResolution (forbid = false) {
 230     if (forbid === true) this.forbidAutoResolution = true
 231
 232     this.autoResolution = false
 233     this.trigger('autoResolutionUpdate')
 234   }
 235
 236   isAutoResolutionForbidden () {
 237     return this.forbidAutoResolution === true
 238   }
 239
 240   getCurrentVideoFile () {
 241     return this.currentVideoFile
 242   }
 243
 244   getTorrent () {
 245     return this.torrent
 246   }
 247
 248   private addTorrent (
 249     magnetOrTorrentUrl: string,
 250     previousVideoFile: VideoFile,
 251     options: {
 252       forcePlay?: boolean,
 253       seek?: number,
 254       delay?: number
 255     },
 256     done: Function
 257   ) {
 258     console.log('Adding ' + magnetOrTorrentUrl + '.')
 259
 260     const oldTorrent = this.torrent
 261     const torrentOptions = {
 262       store: (chunkLength, storeOpts) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
 263         max: 100
 264       })
 265     }
 266
 267     this.torrent = this.webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
 268       console.log('Added ' + magnetOrTorrentUrl + '.')
 269
 270       if (oldTorrent) {
 271         // Pause the old torrent
 272         this.stopTorrent(oldTorrent)
 273
 274         // We use a fake renderer so we download correct pieces of the next file
 275         if (options.delay) this.renderFileInFakeElement(torrent.files[ 0 ], options.delay)
 276       }
 277
 278       // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
 279       this.addTorrentDelay = setTimeout(() => {
 280         // We don't need the fake renderer anymore
 281         this.destroyFakeRenderer()
 282
 283         const paused = this.player.paused()
 284
 285         this.flushVideoFile(previousVideoFile)
 286
 287         const renderVideoOptions = { autoplay: false, controls: true }
 288         renderVideo(torrent.files[ 0 ], this.playerElement, renderVideoOptions, (err, renderer) => {
 289           this.renderer = renderer
 290
 291           if (err) return this.fallbackToHttp(done)
 292
 293           return this.tryToPlay(err => {
 294             if (err) return done(err)
 295
 296             if (options.seek) this.seek(options.seek)
 297             if (options.forcePlay === false && paused === true) this.player.pause()
 298
 299             return done(err)
 300           })
 301         })
 302       }, options.delay || 0)
 303     })
 304
 305     this.torrent.on('error', err => console.error(err))
 306
 307     this.torrent.on('warning', (err: any) => {
 308       // We don't support HTTP tracker but we don't care -> we use the web socket tracker
 309       if (err.message.indexOf('Unsupported tracker protocol') !== -1) return
 310
 311       // Users don't care about issues with WebRTC, but developers do so log it in the console
 312       if (err.message.indexOf('Ice connection failed') !== -1) {
 313         console.log(err)
 314         return
 315       }
 316
 317       // Magnet hash is not up to date with the torrent file, add directly the torrent file
 318       if (err.message.indexOf('incorrect info hash') !== -1) {
 319         console.error('Incorrect info hash detected, falling back to torrent file.')
 320         const newOptions = { forcePlay: true, seek: options.seek }
 321         return this.addTorrent(this.torrent[ 'xs' ], previousVideoFile, newOptions, done)
 322       }
 323
 324       // Remote instance is down
 325       if (err.message.indexOf('from xs param') !== -1) {
 326         this.handleError(err)
 327       }
 328
 329       console.warn(err)
 330     })
 331   }
 332
 333   private tryToPlay (done?: Function) {
 334     if (!done) done = function () { /* empty */ }
 335
 336     const playPromise = this.player.play()
 337     if (playPromise !== undefined) {
 338       return playPromise.then(done)
 339                         .catch(err => {
 340                           if (err.message.indexOf('The play() request was interrupted by a call to pause()') !== -1) {
 341                             return
 342                           }
 343
 344                           console.error(err)
 345                           this.player.pause()
 346                           this.player.posterImage.show()
 347                           this.player.removeClass('vjs-has-autoplay')
 348                           this.player.removeClass('vjs-has-big-play-button-clicked')
 349
 350                           return done()
 351                         })
 352     }
 353
 354     return done()
 355   }
 356
 357   private seek (time: number) {
 358     this.player.currentTime(time)
 359     this.player.handleTechSeeked_()
 360   }
 361
 362   private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
 363     if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
 364     if (this.videoFiles.length === 1) return this.videoFiles[0]
 365
 366     // Don't change the torrent is the play was ended
 367     if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile
 368
 369     if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()
 370
 371     // Limit resolution according to player height
 372     const playerHeight = this.playerElement.offsetHeight as number
 373
 374     // We take the first resolution just above the player height
 375     // Example: player height is 530px, we want the 720p file instead of 480p
 376     let maxResolution = this.videoFiles[0].resolution.id
 377     for (let i = this.videoFiles.length - 1; i >= 0; i--) {
 378       const resolutionId = this.videoFiles[i].resolution.id
 379       if (resolutionId >= playerHeight) {
 380         maxResolution = resolutionId
 381         break
 382       }
 383     }
 384
 385     // Filter videos we can play according to our screen resolution and bandwidth
 386     const filteredFiles = this.videoFiles
 387                               .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(this.videoFiles)
 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     if (isMobile()) this.player.addClass('vjs-is-mobile')
 422
 423     this.initSmoothProgressBar()
 424
 425     this.initCaptions()
 426
 427     this.alterInactivity()
 428
 429     if (this.autoplay === true) {
 430       this.player.posterImage.hide()
 431
 432       return this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 433     }
 434
 435     // Don't try on iOS that does not support MediaSource
 436     if (this.isIOS()) {
 437       this.currentVideoFile = this.pickAverageVideoFile()
 438       return this.fallbackToHttp(undefined, false)
 439     }
 440
 441     // Proxy first play
 442     const oldPlay = this.player.play.bind(this.player)
 443     this.player.play = () => {
 444       this.player.addClass('vjs-has-big-play-button-clicked')
 445       this.player.play = oldPlay
 446
 447       this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
 448     }
 449   }
 450
 451   private runAutoQualityScheduler () {
 452     this.autoQualityInterval = setInterval(() => {
 453
 454       // Not initialized or in HTTP fallback
 455       if (this.torrent === undefined || this.torrent === null) return
 456       if (this.isAutoResolutionOn() === false) return
 457       if (this.isAutoResolutionObservation === true) return
 458
 459       const file = this.getAppropriateFile()
 460       let changeResolution = false
 461       let changeResolutionDelay = 0
 462
 463       // Lower resolution
 464       if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
 465         console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
 466         changeResolution = true
 467       } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
 468         console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
 469         changeResolution = true
 470         changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
 471       }
 472
 473       if (changeResolution === true) {
 474         this.updateResolution(file.resolution.id, changeResolutionDelay)
 475
 476         // Wait some seconds in observation of our new resolution
 477         this.isAutoResolutionObservation = true
 478
 479         this.qualityObservationTimer = setTimeout(() => {
 480           this.isAutoResolutionObservation = false
 481         }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
 482       }
 483     }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
 484   }
 485
 486   private isPlayerWaiting () {
 487     return this.player && this.player.hasClass('vjs-waiting')
 488   }
 489
 490   private runTorrentInfoScheduler () {
 491     this.torrentInfoInterval = setInterval(() => {
 492       // Not initialized yet
 493       if (this.torrent === undefined) return
 494
 495       // Http fallback
 496       if (this.torrent === null) return this.trigger('torrentInfo', false)
 497
 498       // this.webtorrent.downloadSpeed because we need to take into account the potential old torrent too
 499       if (this.webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(this.webtorrent.downloadSpeed)
 500
 501       return this.trigger('torrentInfo', {
 502         downloadSpeed: this.torrent.downloadSpeed,
 503         numPeers: this.torrent.numPeers,
 504         uploadSpeed: this.torrent.uploadSpeed,
 505         downloaded: this.torrent.downloaded,
 506         uploaded: this.torrent.uploaded
 507       })
 508     }, this.CONSTANTS.INFO_SCHEDULER)
 509   }
 510
 511   private runViewAdd () {
 512     this.clearVideoViewInterval()
 513
 514     // After 30 seconds (or 3/4 of the video), add a view to the video
 515     let minSecondsToView = 30
 516
 517     if (this.videoDuration < minSecondsToView) minSecondsToView = (this.videoDuration * 3) / 4
 518
 519     let secondsViewed = 0
 520     this.videoViewInterval = setInterval(() => {
 521       if (this.player && !this.player.paused()) {
 522         secondsViewed += 1
 523
 524         if (secondsViewed > minSecondsToView) {
 525           this.clearVideoViewInterval()
 526
 527           this.addViewToVideo().catch(err => console.error(err))
 528         }
 529       }
 530     }, 1000)
 531   }
 532
 533   private runUserWatchVideo (options: UserWatching) {
 534     let lastCurrentTime = 0
 535
 536     this.userWatchingVideoInterval = setInterval(() => {
 537       const currentTime = Math.floor(this.player.currentTime())
 538
 539       if (currentTime - lastCurrentTime >= 1) {
 540         lastCurrentTime = currentTime
 541
 542         this.notifyUserIsWatching(currentTime, options.url, options.authorizationHeader)
 543           .catch(err => console.error('Cannot notify user is watching.', err))
 544       }
 545     }, this.CONSTANTS.USER_WATCHING_VIDEO_INTERVAL)
 546   }
 547
 548   private clearVideoViewInterval () {
 549     if (this.videoViewInterval !== undefined) {
 550       clearInterval(this.videoViewInterval)
 551       this.videoViewInterval = undefined
 552     }
 553   }
 554
 555   private addViewToVideo () {
 556     if (!this.videoViewUrl) return Promise.resolve(undefined)
 557
 558     return fetch(this.videoViewUrl, { method: 'POST' })
 559   }
 560
 561   private notifyUserIsWatching (currentTime: number, url: string, authorizationHeader: string) {
 562     const body = new URLSearchParams()
 563     body.append('currentTime', currentTime.toString())
 564
 565     const headers = new Headers({ 'Authorization': authorizationHeader })
 566
 567     return fetch(url, { method: 'PUT', body, headers })
 568   }
 569
 570   private fallbackToHttp (done?: Function, play = true) {
 571     this.disableAutoResolution(true)
 572
 573     this.flushVideoFile(this.currentVideoFile, true)
 574     this.torrent = null
 575
 576     // Enable error display now this is our last fallback
 577     this.player.one('error', () => this.enableErrorDisplay())
 578
 579     const httpUrl = this.currentVideoFile.fileUrl
 580     this.player.src = this.savePlayerSrcFunction
 581     this.player.src(httpUrl)
 582     if (play) this.tryToPlay()
 583
 584     if (done) return done()
 585   }
 586
 587   private handleError (err: Error | string) {
 588     return this.player.trigger('customError', { err })
 589   }
 590
 591   private enableErrorDisplay () {
 592     this.player.addClass('vjs-error-display-enabled')
 593   }
 594
 595   private disableErrorDisplay () {
 596     this.player.removeClass('vjs-error-display-enabled')
 597   }
 598
 599   private isIOS () {
 600     return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
 601   }
 602
 603   private alterInactivity () {
 604     let saveInactivityTimeout: number
 605
 606     const disableInactivity = () => {
 607       saveInactivityTimeout = this.player.options_.inactivityTimeout
 608       this.player.options_.inactivityTimeout = 0
 609     }
 610     const enableInactivity = () => {
 611       this.player.options_.inactivityTimeout = saveInactivityTimeout
 612     }
 613
 614     const settingsDialog = this.player.children_.find(c => c.name_ === 'SettingsDialog')
 615
 616     this.player.controlBar.on('mouseenter', () => disableInactivity())
 617     settingsDialog.on('mouseenter', () => disableInactivity())
 618     this.player.controlBar.on('mouseleave', () => enableInactivity())
 619     settingsDialog.on('mouseleave', () => enableInactivity())
 620   }
 621
 622   private pickAverageVideoFile () {
 623     if (this.videoFiles.length === 1) return this.videoFiles[0]
 624
 625     return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
 626   }
 627
 628   private stopTorrent (torrent: WebTorrent.Torrent) {
 629     torrent.pause()
 630     // Pause does not remove actual peers (in particular the webseed peer)
 631     torrent.removePeer(torrent[ 'ws' ])
 632   }
 633
 634   private renderFileInFakeElement (file: WebTorrent.TorrentFile, delay: number) {
 635     this.destoyingFakeRenderer = false
 636
 637     const fakeVideoElem = document.createElement('video')
 638     renderVideo(file, fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
 639       this.fakeRenderer = renderer
 640
 641       // The renderer returns an error when we destroy it, so skip them
 642       if (this.destoyingFakeRenderer === false && err) {
 643         console.error('Cannot render new torrent in fake video element.', err)
 644       }
 645
 646       // Load the future file at the correct time (in delay MS - 2 seconds)
 647       fakeVideoElem.currentTime = this.player.currentTime() + (delay - 2000)
 648     })
 649   }
 650
 651   private destroyFakeRenderer () {
 652     if (this.fakeRenderer) {
 653       this.destoyingFakeRenderer = true
 654
 655       if (this.fakeRenderer.destroy) {
 656         try {
 657           this.fakeRenderer.destroy()
 658         } catch (err) {
 659           console.log('Cannot destroy correctly fake renderer.', err)
 660         }
 661       }
 662       this.fakeRenderer = undefined
 663     }
 664   }
 665
 666   private initCaptions () {
 667     for (const caption of this.videoCaptions) {
 668       this.player.addRemoteTextTrack({
 669         kind: 'captions',
 670         label: caption.label,
 671         language: caption.language,
 672         id: caption.language,
 673         src: caption.src
 674       }, false)
 675     }
 676   }
 677
 678   // Thanks: https://github.com/videojs/video.js/issues/4460#issuecomment-312861657
 679   private initSmoothProgressBar () {
 680     const SeekBar = videojsUntyped.getComponent('SeekBar')
 681     SeekBar.prototype.getPercent = function getPercent () {
 682       // Allows for smooth scrubbing, when player can't keep up.
 683       // const time = (this.player_.scrubbing()) ?
 684       //   this.player_.getCache().currentTime :
 685       //   this.player_.currentTime()
 686       const time = this.player_.currentTime()
 687       const percent = time / this.player_.duration()
 688       return percent >= 1 ? 1 : percent
 689     }
 690     SeekBar.prototype.handleMouseMove = function handleMouseMove (event) {
 691       let newTime = this.calculateDistance(event) * this.player_.duration()
 692       if (newTime === this.player_.duration()) {
 693         newTime = newTime - 0.1
 694       }
 695       this.player_.currentTime(newTime)
 696       this.update()
 697     }
 698   }
 699 }
 700
 701 videojs.registerPlugin('peertube', PeerTubePlugin)
 702 export { PeerTubePlugin }