aboutsummaryrefslogtreecommitdiffhomepage
path: root/client/src/assets/player/peertube-videojs-plugin.ts
blob: 47288c842323b8d2eecfaf06b3fbc80baf5cd36c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
import * as videojs from 'video.js'
import * as WebTorrent from 'webtorrent'
import { VideoFile } from '../../../../shared/models/videos/video.model'
import { renderVideo } from './video-renderer'
import './settings-menu-button'
import { PeertubePluginOptions, VideoJSComponentInterface, videojsUntyped } from './peertube-videojs-typings'
import {
  getAverageBandwidth,
  getStoredMute,
  getStoredVolume, isMobile,
  saveAverageBandwidth,
  saveMuteInStore,
  saveVolumeInStore,
  videoFileMaxByResolution,
  videoFileMinByResolution
} from './utils'
import * as CacheChunkStore from 'cache-chunk-store'
import { PeertubeChunkStore } from './peertube-chunk-store'

const webtorrent = new WebTorrent({
  tracker: {
    rtcConfig: {
      iceServers: [
        {
          urls: 'stun:stun.stunprotocol.org'
        },
        {
          urls: 'stun:stun.framasoft.org'
        }
      ]
    }
  },
  dht: false
})

const Plugin: VideoJSComponentInterface = videojsUntyped.getPlugin('plugin')
class PeerTubePlugin extends Plugin {
  private readonly playerElement: HTMLVideoElement

  private readonly autoplay: boolean = false
  private readonly startTime: number = 0
  private readonly savePlayerSrcFunction: Function
  private readonly videoFiles: VideoFile[]
  private readonly videoViewUrl: string
  private readonly videoDuration: number
  private readonly CONSTANTS = {
    INFO_SCHEDULER: 1000, // Don't change this
    AUTO_QUALITY_SCHEDULER: 3000, // Check quality every 3 seconds
    AUTO_QUALITY_THRESHOLD_PERCENT: 30, // Bandwidth should be 30% more important than a resolution bitrate to change to it
    AUTO_QUALITY_OBSERVATION_TIME: 10000, // Wait 10 seconds after having change the resolution before another check
    AUTO_QUALITY_HIGHER_RESOLUTION_DELAY: 5000, // Buffering higher resolution during 5 seconds
    BANDWIDTH_AVERAGE_NUMBER_OF_VALUES: 5 // Last 5 seconds to build average bandwidth
  }

  private player: any
  private currentVideoFile: VideoFile
  private torrent: WebTorrent.Torrent
  private autoResolution = true
  private isAutoResolutionObservation = false

  private videoViewInterval
  private torrentInfoInterval
  private autoQualityInterval
  private addTorrentDelay
  private qualityObservationTimer
  private runAutoQualitySchedulerTimer

  private downloadSpeeds: number[] = []

  constructor (player: videojs.Player, options: PeertubePluginOptions) {
    super(player, options)

    // Disable auto play on iOS
    this.autoplay = options.autoplay && this.isIOS() === false

    this.startTime = options.startTime
    this.videoFiles = options.videoFiles
    this.videoViewUrl = options.videoViewUrl
    this.videoDuration = options.videoDuration

    this.savePlayerSrcFunction = this.player.src
    // Hack to "simulate" src link in video.js >= 6
    // Without this, we can't play the video after pausing it
    // https://github.com/videojs/video.js/blob/master/src/js/player.js#L1633
    this.player.src = () => true

    this.playerElement = options.playerElement

    if (this.autoplay === true) this.player.addClass('vjs-has-autoplay')

    this.player.ready(() => {
      const volume = getStoredVolume()
      if (volume !== undefined) this.player.volume(volume)
      const muted = getStoredMute()
      if (muted !== undefined) this.player.muted(muted)

      this.initializePlayer()
      this.runTorrentInfoScheduler()
      this.runViewAdd()

      this.player.one('play', () => {
        // Don't run immediately scheduler, wait some seconds the TCP connections are made
        this.runAutoQualitySchedulerTimer = setTimeout(() => {
          this.runAutoQualityScheduler()
        }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
      })
    })

    this.player.on('volumechange', () => {
      saveVolumeInStore(this.player.volume())
      saveMuteInStore(this.player.muted())
    })
  }

  dispose () {
    clearTimeout(this.addTorrentDelay)
    clearTimeout(this.qualityObservationTimer)
    clearTimeout(this.runAutoQualitySchedulerTimer)

    clearInterval(this.videoViewInterval)
    clearInterval(this.torrentInfoInterval)
    clearInterval(this.autoQualityInterval)

    // Don't need to destroy renderer, video player will be destroyed
    this.flushVideoFile(this.currentVideoFile, false)
  }

  getCurrentResolutionId () {
    return this.currentVideoFile ? this.currentVideoFile.resolution.id : -1
  }

  getCurrentResolutionLabel () {
    return this.currentVideoFile ? this.currentVideoFile.resolution.label : ''
  }

  updateVideoFile (
    videoFile?: VideoFile,
    options: {
      forcePlay?: boolean,
      seek?: number,
      delay?: number
    } = {},
    done: () => void = () => { /* empty */ }
  ) {
    // Automatically choose the adapted video file
    if (videoFile === undefined) {
      const savedAverageBandwidth = getAverageBandwidth()
      videoFile = savedAverageBandwidth
        ? this.getAppropriateFile(savedAverageBandwidth)
        : this.pickAverageVideoFile()
    }

    // Don't add the same video file once again
    if (this.currentVideoFile !== undefined && this.currentVideoFile.magnetUri === videoFile.magnetUri) {
      return
    }

    // Do not display error to user because we will have multiple fallback
    this.disableErrorDisplay()

    this.player.src = () => true
    const oldPlaybackRate = this.player.playbackRate()

    const previousVideoFile = this.currentVideoFile
    this.currentVideoFile = videoFile

    this.addTorrent(this.currentVideoFile.magnetUri, previousVideoFile, options, () => {
      this.player.playbackRate(oldPlaybackRate)
      return done()
    })

    this.trigger('videoFileUpdate')
  }

  addTorrent (
    magnetOrTorrentUrl: string,
    previousVideoFile: VideoFile,
    options: {
      forcePlay?: boolean,
      seek?: number,
      delay?: number
    },
    done: Function
  ) {
    console.log('Adding ' + magnetOrTorrentUrl + '.')

    const oldTorrent = this.torrent
    let fakeRenderer
    const torrentOptions = {
      store: (chunkLength, storeOpts) => new CacheChunkStore(new PeertubeChunkStore(chunkLength, storeOpts), {
        max: 100
      })
    }

    this.torrent = webtorrent.add(magnetOrTorrentUrl, torrentOptions, torrent => {
      console.log('Added ' + magnetOrTorrentUrl + '.')

      if (oldTorrent) {
        // Pause the old torrent
        oldTorrent.pause()
        // Pause does not remove actual peers (in particular the webseed peer)
        oldTorrent.removePeer(oldTorrent['ws'])

        // We use a fake renderer so we download correct pieces of the next file
        if (options.delay) {
          const fakeVideoElem = document.createElement('video')
          renderVideo(torrent.files[0], fakeVideoElem, { autoplay: false, controls: false }, (err, renderer) => {
            fakeRenderer = renderer

            if (err) console.error('Cannot render new torrent in fake video element.', err)

            // Load the future file at the correct time
            fakeVideoElem.currentTime = this.player.currentTime() + (options.delay / 2000)
          })
        }
      }

      // Render the video in a few seconds? (on resolution change for example, we wait some seconds of the new video resolution)
      this.addTorrentDelay = setTimeout(() => {
        if (fakeRenderer) {
          if (fakeRenderer.destroy) {
            try {
              fakeRenderer.destroy()
            } catch (err) {
              console.log('Cannot destroy correctly fake renderer.', err)
            }
          }
          fakeRenderer = undefined
        }

        const paused = this.player.paused()

        this.flushVideoFile(previousVideoFile)

        const renderVideoOptions = { autoplay: false, controls: true }
        renderVideo(torrent.files[0], this.playerElement, renderVideoOptions,(err, renderer) => {
          this.renderer = renderer

          if (err) return this.fallbackToHttp(done)

          return this.tryToPlay(err => {
            if (err) return done(err)

            if (options.seek) this.seek(options.seek)
            if (options.forcePlay === false && paused === true) this.player.pause()
          })
        })
      }, options.delay || 0)
    })

    this.torrent.on('error', err => this.handleError(err))

    this.torrent.on('warning', (err: any) => {
      // We don't support HTTP tracker but we don't care -> we use the web socket tracker
      if (err.message.indexOf('Unsupported tracker protocol') !== -1) return

      // Users don't care about issues with WebRTC, but developers do so log it in the console
      if (err.message.indexOf('Ice connection failed') !== -1) {
        console.error(err)
        return
      }

      // Magnet hash is not up to date with the torrent file, add directly the torrent file
      if (err.message.indexOf('incorrect info hash') !== -1) {
        console.error('Incorrect info hash detected, falling back to torrent file.')
        const options = { forcePlay: true }
        return this.addTorrent(this.torrent['xs'], previousVideoFile, options, done)
      }

      return this.handleError(err)
    })
  }

  updateResolution (resolutionId: number, delay = 0) {
    // Remember player state
    const currentTime = this.player.currentTime()
    const isPaused = this.player.paused()

    // Remove poster to have black background
    this.playerElement.poster = ''

    // Hide bigPlayButton
    if (!isPaused) {
      this.player.bigPlayButton.hide()
    }

    const newVideoFile = this.videoFiles.find(f => f.resolution.id === resolutionId)
    const options = {
      forcePlay: false,
      delay,
      seek: currentTime + (delay / 1000)
    }
    this.updateVideoFile(newVideoFile, options)
  }

  flushVideoFile (videoFile: VideoFile, destroyRenderer = true) {
    if (videoFile !== undefined && webtorrent.get(videoFile.magnetUri)) {
      if (destroyRenderer === true && this.renderer && this.renderer.destroy) this.renderer.destroy()

      webtorrent.remove(videoFile.magnetUri)
      console.log('Removed ' + videoFile.magnetUri)
    }
  }

  isAutoResolutionOn () {
    return this.autoResolution
  }

  enableAutoResolution () {
    this.autoResolution = true
    this.trigger('autoResolutionUpdate')
  }

  disableAutoResolution () {
    this.autoResolution = false
    this.trigger('autoResolutionUpdate')
  }

  getCurrentVideoFile () {
    return this.currentVideoFile
  }

  getTorrent () {
    return this.torrent
  }

  private tryToPlay (done?: Function) {
    if (!done) done = function () { /* empty */ }

    const playPromise = this.player.play()
    if (playPromise !== undefined) {
      return playPromise.then(done)
                        .catch(err => {
                          console.error(err)
                          this.player.pause()
                          this.player.posterImage.show()
                          this.player.removeClass('vjs-has-autoplay')
                          this.player.removeClass('vjs-has-big-play-button-clicked')

                          return done()
                        })
    }

    return done()
  }

  private seek (time: number) {
    this.player.currentTime(time)
    this.player.handleTechSeeked_()
  }

  private getAppropriateFile (averageDownloadSpeed?: number): VideoFile {
    if (this.videoFiles === undefined || this.videoFiles.length === 0) return undefined
    if (this.videoFiles.length === 1) return this.videoFiles[0]

    // Don't change the torrent is the play was ended
    if (this.torrent && this.torrent.progress === 1 && this.player.ended()) return this.currentVideoFile

    if (!averageDownloadSpeed) averageDownloadSpeed = this.getAndSaveActualDownloadSpeed()

    // Filter videos we can play according to our bandwidth
    const filteredFiles = this.videoFiles.filter(f => {
      const fileBitrate = (f.size / this.videoDuration)
      let threshold = fileBitrate

      // If this is for a higher resolution or an initial load: add a margin
      if (!this.currentVideoFile || f.resolution.id > this.currentVideoFile.resolution.id) {
        threshold += ((fileBitrate * this.CONSTANTS.AUTO_QUALITY_THRESHOLD_PERCENT) / 100)
      }

      return averageDownloadSpeed > threshold
    })

    // If the download speed is too bad, return the lowest resolution we have
    if (filteredFiles.length === 0) return videoFileMinByResolution(this.videoFiles)

    return videoFileMaxByResolution(filteredFiles)
  }

  private getAndSaveActualDownloadSpeed () {
    const start = Math.max(this.downloadSpeeds.length - this.CONSTANTS.BANDWIDTH_AVERAGE_NUMBER_OF_VALUES, 0)
    const lastDownloadSpeeds = this.downloadSpeeds.slice(start, this.downloadSpeeds.length)
    if (lastDownloadSpeeds.length === 0) return -1

    const sum = lastDownloadSpeeds.reduce((a, b) => a + b)
    const averageBandwidth = Math.round(sum / lastDownloadSpeeds.length)

    // Save the average bandwidth for future use
    saveAverageBandwidth(averageBandwidth)

    return averageBandwidth
  }

  private initializePlayer () {
    if (isMobile()) this.player.addClass('vjs-is-mobile')

    this.initSmoothProgressBar()

    this.alterInactivity()

    if (this.autoplay === true) {
      this.player.posterImage.hide()

      this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
    } else {
      // Don't try on iOS that does not support MediaSource
      if (this.isIOS()) {
        this.currentVideoFile = this.pickAverageVideoFile()
        return this.fallbackToHttp(undefined, false)
      }

      // Proxy first play
      const oldPlay = this.player.play.bind(this.player)
      this.player.play = () => {
        this.player.addClass('vjs-has-big-play-button-clicked')
        this.player.play = oldPlay

        this.updateVideoFile(undefined, { forcePlay: true, seek: this.startTime })
      }
    }
  }

  private runAutoQualityScheduler () {
    this.autoQualityInterval = setInterval(() => {

      // Not initialized or in HTTP fallback
      if (this.torrent === undefined || this.torrent === null) return
      if (this.isAutoResolutionOn() === false) return
      if (this.isAutoResolutionObservation === true) return

      const file = this.getAppropriateFile()
      let changeResolution = false
      let changeResolutionDelay = 0

      // Lower resolution
      if (this.isPlayerWaiting() && file.resolution.id < this.currentVideoFile.resolution.id) {
        console.log('Downgrading automatically the resolution to: %s', file.resolution.label)
        changeResolution = true
      } else if (file.resolution.id > this.currentVideoFile.resolution.id) { // Higher resolution
        console.log('Upgrading automatically the resolution to: %s', file.resolution.label)
        changeResolution = true
        changeResolutionDelay = this.CONSTANTS.AUTO_QUALITY_HIGHER_RESOLUTION_DELAY
      }

      if (changeResolution === true) {
        this.updateResolution(file.resolution.id, changeResolutionDelay)

        // Wait some seconds in observation of our new resolution
        this.isAutoResolutionObservation = true

        this.qualityObservationTimer = setTimeout(() => {
          this.isAutoResolutionObservation = false
        }, this.CONSTANTS.AUTO_QUALITY_OBSERVATION_TIME)
      }
    }, this.CONSTANTS.AUTO_QUALITY_SCHEDULER)
  }

  private isPlayerWaiting () {
    return this.player && this.player.hasClass('vjs-waiting')
  }

  private runTorrentInfoScheduler () {
    this.torrentInfoInterval = setInterval(() => {
      // Not initialized yet
      if (this.torrent === undefined) return

      // Http fallback
      if (this.torrent === null) return this.trigger('torrentInfo', false)

      // webtorrent.downloadSpeed because we need to take into account the potential old torrent too
      if (webtorrent.downloadSpeed !== 0) this.downloadSpeeds.push(webtorrent.downloadSpeed)

      return this.trigger('torrentInfo', {
        downloadSpeed: this.torrent.downloadSpeed,
        numPeers: this.torrent.numPeers,
        uploadSpeed: this.torrent.uploadSpeed
      })
    }, this.CONSTANTS.INFO_SCHEDULER)
  }

  private runViewAdd () {
    this.clearVideoViewInterval()

    // After 30 seconds (or 3/4 of the video), add a view to the video
    let minSecondsToView = 30

    if (this.videoDuration < minSecondsToView) minSecondsToView = (this.videoDuration * 3) / 4

    let secondsViewed = 0
    this.videoViewInterval = setInterval(() => {
      if (this.player && !this.player.paused()) {
        secondsViewed += 1

        if (secondsViewed > minSecondsToView) {
          this.clearVideoViewInterval()

          this.addViewToVideo().catch(err => console.error(err))
        }
      }
    }, 1000)
  }

  private clearVideoViewInterval () {
    if (this.videoViewInterval !== undefined) {
      clearInterval(this.videoViewInterval)
      this.videoViewInterval = undefined
    }
  }

  private addViewToVideo () {
    return fetch(this.videoViewUrl, { method: 'POST' })
  }

  private fallbackToHttp (done?: Function, play = true) {
    this.flushVideoFile(this.currentVideoFile, true)
    this.torrent = null

    // Enable error display now this is our last fallback
    this.player.one('error', () => this.enableErrorDisplay())

    const httpUrl = this.currentVideoFile.fileUrl
    this.player.src = this.savePlayerSrcFunction
    this.player.src(httpUrl)
    if (play) this.tryToPlay()

    if (done) return done()
  }

  private handleError (err: Error | string) {
    return this.player.trigger('customError', { err })
  }

  private enableErrorDisplay () {
    this.player.addClass('vjs-error-display-enabled')
  }

  private disableErrorDisplay () {
    this.player.removeClass('vjs-error-display-enabled')
  }

  private isIOS () {
    return !!navigator.platform && /iPad|iPhone|iPod/.test(navigator.platform)
  }

  private alterInactivity () {
    let saveInactivityTimeout: number

    const disableInactivity = () => {
      saveInactivityTimeout = this.player.options_.inactivityTimeout
      this.player.options_.inactivityTimeout = 0
    }
    const enableInactivity = () => {
      this.player.options_.inactivityTimeout = saveInactivityTimeout
    }

    const settingsDialog = this.player.children_.find(c => c.name_ === 'SettingsDialog')

    this.player.controlBar.on('mouseenter', () => disableInactivity())
    settingsDialog.on('mouseenter', () => disableInactivity())
    this.player.controlBar.on('mouseleave', () => enableInactivity())
    settingsDialog.on('mouseleave', () => enableInactivity())
  }

  private pickAverageVideoFile () {
    if (this.videoFiles.length === 1) return this.videoFiles[0]

    return this.videoFiles[Math.floor(this.videoFiles.length / 2)]
  }

  // Thanks: https://github.com/videojs/video.js/issues/4460#issuecomment-312861657
  private initSmoothProgressBar () {
    const SeekBar = videojsUntyped.getComponent('SeekBar')
    SeekBar.prototype.getPercent = function getPercent () {
      // Allows for smooth scrubbing, when player can't keep up.
      // const time = (this.player_.scrubbing()) ?
      //   this.player_.getCache().currentTime :
      //   this.player_.currentTime()
      const time = this.player_.currentTime()
      const percent = time / this.player_.duration()
      return percent >= 1 ? 1 : percent
    }
    SeekBar.prototype.handleMouseMove = function handleMouseMove (event) {
      let newTime = this.calculateDistance(event) * this.player_.duration()
      if (newTime === this.player_.duration()) {
        newTime = newTime - 0.1
      }
      this.player_.currentTime(newTime)
      this.update()
    }
  }
}

videojsUntyped.registerPlugin('peertube', PeerTubePlugin)
export { PeerTubePlugin }