-
Notifications
You must be signed in to change notification settings - Fork 1.4k
/
Copy pathmedia_source_engine.js
2613 lines (2373 loc) · 88.9 KB
/
media_source_engine.js
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
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*! @license
* Shaka Player
* Copyright 2016 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
goog.provide('shaka.media.MediaSourceEngine');
goog.require('goog.asserts');
goog.require('shaka.log');
goog.require('shaka.config.CodecSwitchingStrategy');
goog.require('shaka.media.Capabilities');
goog.require('shaka.media.ContentWorkarounds');
goog.require('shaka.media.ClosedCaptionParser');
goog.require('shaka.media.IClosedCaptionParser');
goog.require('shaka.media.ManifestParser');
goog.require('shaka.media.SegmentReference');
goog.require('shaka.media.TimeRangesUtils');
goog.require('shaka.text.TextEngine');
goog.require('shaka.transmuxer.TransmuxerEngine');
goog.require('shaka.util.BufferUtils');
goog.require('shaka.util.Destroyer');
goog.require('shaka.util.Dom');
goog.require('shaka.util.Error');
goog.require('shaka.util.EventManager');
goog.require('shaka.util.FakeEvent');
goog.require('shaka.util.Functional');
goog.require('shaka.util.IDestroyable');
goog.require('shaka.util.Id3Utils');
goog.require('shaka.util.ManifestParserUtils');
goog.require('shaka.util.MimeUtils');
goog.require('shaka.util.Mp4BoxParsers');
goog.require('shaka.util.Mp4Parser');
goog.require('shaka.util.Platform');
goog.require('shaka.util.PublicPromise');
goog.require('shaka.util.StreamUtils');
goog.require('shaka.util.TsParser');
goog.require('shaka.lcevc.Dec');
/**
* @summary
* MediaSourceEngine wraps all operations on MediaSource and SourceBuffers.
* All asynchronous operations return a Promise, and all operations are
* internally synchronized and serialized as needed. Operations that can
* be done in parallel will be done in parallel.
*
* @implements {shaka.util.IDestroyable}
*/
shaka.media.MediaSourceEngine = class {
/**
* @param {HTMLMediaElement} video The video element, whose source is tied to
* MediaSource during the lifetime of the MediaSourceEngine.
* @param {!shaka.extern.TextDisplayer} textDisplayer
* The text displayer that will be used with the text engine.
* MediaSourceEngine takes ownership of the displayer. When
* MediaSourceEngine is destroyed, it will destroy the displayer.
* @param {!shaka.media.MediaSourceEngine.PlayerInterface} playerInterface
* Interface for common player methods.
* @param {?shaka.lcevc.Dec} [lcevcDec] Optional - LCEVC Decoder Object
*/
constructor(video, textDisplayer, playerInterface, lcevcDec) {
/** @private {HTMLMediaElement} */
this.video_ = video;
/** @private {?shaka.media.MediaSourceEngine.PlayerInterface} */
this.playerInterface_ = playerInterface;
/** @private {?shaka.extern.MediaSourceConfiguration} */
this.config_ = null;
/** @private {shaka.extern.TextDisplayer} */
this.textDisplayer_ = textDisplayer;
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* SourceBuffer>}
*/
this.sourceBuffers_ = {};
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* string>}
*/
this.sourceBufferTypes_ = {};
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* boolean>}
*/
this.expectedEncryption_ = {};
/** @private {shaka.text.TextEngine} */
this.textEngine_ = null;
/** @private {boolean} */
this.segmentRelativeVttTiming_ = false;
/** @private {?shaka.lcevc.Dec} */
this.lcevcDec_ = lcevcDec || null;
/**
* @private {!Object<string,
* !Array<shaka.media.MediaSourceEngine.Operation>>}
*/
this.queues_ = {};
/** @private {shaka.util.EventManager} */
this.eventManager_ = new shaka.util.EventManager();
/** @private {!Object<string, !shaka.extern.Transmuxer>} */
this.transmuxers_ = {};
/** @private {?shaka.media.IClosedCaptionParser} */
this.captionParser_ = null;
/** @private {!shaka.util.PublicPromise} */
this.mediaSourceOpen_ = new shaka.util.PublicPromise();
/** @private {string} */
this.url_ = '';
/** @private {boolean} */
this.playbackHasBegun_ = false;
/** @private {boolean} */
this.streamingAllowed_ = true;
/** @private {boolean} */
this.usingRemotePlayback_ = false;
/** @private {HTMLSourceElement} */
this.source_ = null;
/**
* Fallback source element with direct media URI, used for casting
* purposes.
* @private {HTMLSourceElement}
*/
this.secondarySource_ = null;
/** @private {MediaSource} */
this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
/** @private {boolean} */
this.reloadingMediaSource_ = false;
/** @type {!shaka.util.Destroyer} */
this.destroyer_ = new shaka.util.Destroyer(() => this.doDestroy_());
/** @private {boolean} */
this.sequenceMode_ = false;
/** @private {string} */
this.manifestType_ = shaka.media.ManifestParser.UNKNOWN;
/** @private {boolean} */
this.ignoreManifestTimestampsInSegmentsMode_ = false;
/** @private {boolean} */
this.attemptTimestampOffsetCalculation_ = false;
/** @private {!shaka.util.PublicPromise<number>} */
this.textSequenceModeOffset_ = new shaka.util.PublicPromise();
/** @private {boolean} */
this.needSplitMuxedContent_ = false;
/** @private {?number} */
this.lastDuration_ = null;
/**
* @private {!Object<shaka.util.ManifestParserUtils.ContentType,
* !shaka.util.TsParser>}
*/
this.tsParsers_ = {};
/** @private {?number} */
this.firstVideoTimestamp_ = null;
/** @private {?number} */
this.firstVideoReferenceStartTime_ = null;
/** @private {?number} */
this.firstAudioTimestamp_ = null;
/** @private {?number} */
this.firstAudioReferenceStartTime_ = null;
/** @private {!shaka.util.PublicPromise<number>} */
this.audioCompensation_ = new shaka.util.PublicPromise();
if (this.video_.remote) {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
this.eventManager_.listen(this.video_.remote, 'connect', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
this.eventManager_.listen(this.video_.remote, 'connecting', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
this.eventManager_.listen(this.video_.remote, 'disconnect', () => {
this.usingRemotePlayback_ = this.video_.remote.state != 'disconnected';
});
}
}
/**
* Create a MediaSource object, attach it to the video element, and return it.
* Resolves the given promise when the MediaSource is ready.
*
* Replaced by unit tests.
*
* @param {!shaka.util.PublicPromise} p
* @return {!MediaSource}
*/
createMediaSource(p) {
this.streamingAllowed_ = true;
/** @type {!MediaSource} */
let mediaSource;
if (window.ManagedMediaSource) {
if (!this.secondarySource_) {
this.video_.disableRemotePlayback = true;
}
mediaSource = new ManagedMediaSource();
this.eventManager_.listen(
mediaSource, 'startstreaming', () => {
shaka.log.info('MMS startstreaming');
this.streamingAllowed_ = true;
});
this.eventManager_.listen(
mediaSource, 'endstreaming', () => {
shaka.log.info('MMS endstreaming');
this.streamingAllowed_ = false;
});
} else {
mediaSource = new MediaSource();
}
// Set up MediaSource on the video element.
this.eventManager_.listenOnce(
mediaSource, 'sourceopen', () => this.onSourceOpen_(p));
// Correctly set when playback has begun.
this.eventManager_.listenOnce(this.video_, 'playing', () => {
this.playbackHasBegun_ = true;
});
// Store the object URL for releasing it later.
this.url_ = shaka.media.MediaSourceEngine.createObjectURL(mediaSource);
this.video_.removeAttribute('src');
if (this.source_) {
this.video_.removeChild(this.source_);
}
if (this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
this.source_ = shaka.util.Dom.createSourceElement(this.url_);
this.video_.appendChild(this.source_);
if (this.secondarySource_) {
this.video_.appendChild(this.secondarySource_);
}
this.video_.load();
return mediaSource;
}
/**
* @param {string} uri
* @param {string} mimeType
*/
addSecondarySource(uri, mimeType) {
if (!this.video_ || !window.ManagedMediaSource || !this.mediaSource_) {
shaka.log.warning(
'Secondary source is used only with ManagedMediaSource');
return;
}
if (this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
this.secondarySource_ = shaka.util.Dom.createSourceElement(uri, mimeType);
this.video_.appendChild(this.secondarySource_);
this.video_.disableRemotePlayback = false;
}
/**
* @param {shaka.util.PublicPromise} p
* @private
*/
onSourceOpen_(p) {
goog.asserts.assert(this.url_, 'Must have object URL');
// Release the object URL that was previously created, to prevent memory
// leak.
// createObjectURL creates a strong reference to the MediaSource object
// inside the browser. Setting the src of the video then creates another
// reference within the video element. revokeObjectURL will remove the
// strong reference to the MediaSource object, and allow it to be
// garbage-collected later.
URL.revokeObjectURL(this.url_);
p.resolve();
}
/**
* Checks if a certain type is supported.
*
* @param {shaka.extern.Stream} stream
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {!Promise<boolean>}
*/
static async isStreamSupported(stream, contentType) {
if (stream.createSegmentIndex) {
await stream.createSegmentIndex();
}
if (!stream.segmentIndex) {
return false;
}
if (stream.segmentIndex.isEmpty()) {
return true;
}
const MimeUtils = shaka.util.MimeUtils;
const TransmuxerEngine = shaka.transmuxer.TransmuxerEngine;
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const StreamUtils = shaka.util.StreamUtils;
const seenCombos = new Set();
// Check each combination of mimeType and codecs within the segment index.
// Unfortunately we cannot use fullMimeTypes, as we ALSO need to check the
// getFullTypeWithAllCodecs (for the sake of the transmuxer) and we have no
// way of going from a full mimeType to a full mimeType with all codecs.
// As this function is only called in debug mode, a little inefficiency is
// acceptable.
for (const ref of stream.segmentIndex) {
const mimeType = ref.mimeType || stream.mimeType || '';
let codecs = ref.codecs || stream.codecs || '';
// Optimization for the case where the codecs and mimetype of the stream
// match the reference.
if (mimeType == stream.mimeType && codecs == stream.codecs) {
continue;
}
// Don't check the same combination of mimetype + codecs twice.
const combo = mimeType + ':' + codecs;
if (seenCombos.has(combo)) {
continue;
}
seenCombos.add(combo);
if (contentType == ContentType.TEXT) {
const fullMimeType = MimeUtils.getFullType(mimeType, codecs);
if (!shaka.text.TextEngine.isTypeSupported(fullMimeType)) {
return false;
}
} else {
if (contentType == ContentType.VIDEO) {
codecs = StreamUtils.getCorrectVideoCodecs(codecs);
} else if (contentType == ContentType.AUDIO) {
codecs = StreamUtils.getCorrectAudioCodecs(codecs, mimeType);
}
const extendedMimeType = MimeUtils.getExtendedType(
stream, mimeType, codecs);
const fullMimeType = MimeUtils.getFullTypeWithAllCodecs(
mimeType, codecs);
if (!shaka.media.Capabilities.isTypeSupported(extendedMimeType) &&
!TransmuxerEngine.isSupported(fullMimeType, stream.type)) {
return false;
}
}
}
return true;
}
/**
* Returns a map of MediaSource support for well-known types.
*
* @return {!Object<string, boolean>}
*/
static probeSupport() {
const testMimeTypes = [
// MP4 types
'video/mp4; codecs="avc1.42E01E"',
'video/mp4; codecs="avc3.42E01E"',
'video/mp4; codecs="hev1.1.6.L93.90"',
'video/mp4; codecs="hvc1.1.6.L93.90"',
'video/mp4; codecs="hev1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
'video/mp4; codecs="hvc1.2.4.L153.B0"; eotf="smpte2084"', // HDR HEVC
'video/mp4; codecs="vp9"',
'video/mp4; codecs="vp09.00.10.08"',
'video/mp4; codecs="av01.0.01M.08"',
'video/mp4; codecs="dvh1.05.01"',
'video/mp4; codecs="dvh1.20.01"',
'audio/mp4; codecs="mp4a.40.2"',
'audio/mp4; codecs="ac-3"',
'audio/mp4; codecs="ec-3"',
'audio/mp4; codecs="ac-4.02.01.01"',
'audio/mp4; codecs="opus"',
'audio/mp4; codecs="flac"',
'audio/mp4; codecs="dtsc"', // DTS Digital Surround
'audio/mp4; codecs="dtse"', // DTS Express
'audio/mp4; codecs="dtsx"', // DTS:X
// WebM types
'video/webm; codecs="vp8"',
'video/webm; codecs="vp9"',
'video/webm; codecs="vp09.00.10.08"',
'audio/webm; codecs="vorbis"',
'audio/webm; codecs="opus"',
// MPEG2 TS types (video/ is also used for audio: https://bit.ly/TsMse)
'video/mp2t; codecs="avc1.42E01E"',
'video/mp2t; codecs="avc3.42E01E"',
'video/mp2t; codecs="hvc1.1.6.L93.90"',
'video/mp2t; codecs="mp4a.40.2"',
'video/mp2t; codecs="ac-3"',
'video/mp2t; codecs="ec-3"',
// WebVTT types
'text/vtt',
'application/mp4; codecs="wvtt"',
// TTML types
'application/ttml+xml',
'application/mp4; codecs="stpp"',
// Containerless types
...shaka.util.MimeUtils.RAW_FORMATS,
];
const support = {};
for (const type of testMimeTypes) {
if (shaka.text.TextEngine.isTypeSupported(type)) {
support[type] = true;
} else if (shaka.util.Platform.supportsMediaSource()) {
support[type] = shaka.media.Capabilities.isTypeSupported(type) ||
shaka.transmuxer.TransmuxerEngine.isSupported(type);
} else {
support[type] = shaka.util.Platform.supportsMediaType(type);
}
const basicType = type.split(';')[0];
support[basicType] = support[basicType] || support[type];
}
return support;
}
/** @override */
destroy() {
return this.destroyer_.destroy();
}
/** @private */
async doDestroy_() {
const Functional = shaka.util.Functional;
const cleanup = [];
for (const contentType in this.queues_) {
// Make a local copy of the queue and the first item.
const q = this.queues_[contentType];
const inProgress = q[0];
// Drop everything else out of the original queue.
this.queues_[contentType] = q.slice(0, 1);
// We will wait for this item to complete/fail.
if (inProgress) {
cleanup.push(inProgress.p.catch(Functional.noop));
}
// The rest will be rejected silently if possible.
for (const item of q.slice(1)) {
item.p.reject(shaka.util.Destroyer.destroyedError());
}
}
if (this.textEngine_) {
cleanup.push(this.textEngine_.destroy());
}
await Promise.all(cleanup);
for (const contentType in this.transmuxers_) {
this.transmuxers_[contentType].destroy();
}
if (this.eventManager_) {
this.eventManager_.release();
this.eventManager_ = null;
}
if (this.video_ && this.secondarySource_) {
this.video_.removeChild(this.secondarySource_);
}
if (this.video_ && this.source_) {
// "unload" the video element.
this.video_.removeChild(this.source_);
this.video_.load();
this.video_.disableRemotePlayback = false;
}
this.video_ = null;
this.source_ = null;
this.secondarySource_ = null;
this.config_ = null;
this.mediaSource_ = null;
this.textEngine_ = null;
this.textDisplayer_ = null;
this.sourceBuffers_ = {};
this.transmuxers_ = {};
this.captionParser_ = null;
if (goog.DEBUG) {
for (const contentType in this.queues_) {
goog.asserts.assert(
this.queues_[contentType].length == 0,
contentType + ' queue should be empty after destroy!');
}
}
this.queues_ = {};
// This object is owned by Player
this.lcevcDec_ = null;
this.tsParsers_ = {};
this.playerInterface_ = null;
}
/**
* @return {!Promise} Resolved when MediaSource is open and attached to the
* media element. This process is actually initiated by the constructor.
*/
open() {
return this.mediaSourceOpen_;
}
/**
* Initialize MediaSourceEngine.
*
* Note that it is not valid to call this multiple times, except to add or
* reinitialize text streams.
*
* @param {!Map<shaka.util.ManifestParserUtils.ContentType,
* shaka.extern.Stream>} streamsByType
* A map of content types to streams. All streams must be supported
* according to MediaSourceEngine.isStreamSupported.
* @param {boolean=} sequenceMode
* If true, the media segments are appended to the SourceBuffer in strict
* sequence.
* @param {string=} manifestType
* Indicates the type of the manifest.
* @param {boolean=} ignoreManifestTimestampsInSegmentsMode
* If true, don't adjust the timestamp offset to account for manifest
* segment durations being out of sync with segment durations. In other
* words, assume that there are no gaps in the segments when appending
* to the SourceBuffer, even if the manifest and segment times disagree.
* Indicates if the manifest has text streams.
*
* @return {!Promise}
*/
async init(streamsByType, sequenceMode=false,
manifestType=shaka.media.ManifestParser.UNKNOWN,
ignoreManifestTimestampsInSegmentsMode=false) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
await this.mediaSourceOpen_;
if (this.ended() || this.closed()) {
shaka.log.alwaysError('Expected MediaSource to be open during init(); ' +
'reopening the media source.');
this.mediaSourceOpen_ = new shaka.util.PublicPromise();
this.mediaSource_ = this.createMediaSource(this.mediaSourceOpen_);
await this.mediaSourceOpen_;
}
this.sequenceMode_ = sequenceMode;
this.manifestType_ = manifestType;
this.ignoreManifestTimestampsInSegmentsMode_ =
ignoreManifestTimestampsInSegmentsMode;
this.attemptTimestampOffsetCalculation_ = !this.sequenceMode_ &&
this.manifestType_ == shaka.media.ManifestParser.HLS &&
!this.ignoreManifestTimestampsInSegmentsMode_;
this.tsParsers_ = {};
this.firstVideoTimestamp_ = null;
this.firstVideoReferenceStartTime_ = null;
this.firstAudioTimestamp_ = null;
this.firstAudioReferenceStartTime_ = null;
this.audioCompensation_ = new shaka.util.PublicPromise();
for (const contentType of streamsByType.keys()) {
const stream = streamsByType.get(contentType);
// eslint-disable-next-line no-await-in-loop
await this.initSourceBuffer_(contentType, stream, stream.codecs);
if (this.needSplitMuxedContent_) {
this.queues_[ContentType.AUDIO] = [];
this.queues_[ContentType.VIDEO] = [];
} else {
this.queues_[contentType] = [];
}
}
const audio = streamsByType.get(ContentType.AUDIO);
if (audio && audio.isAudioMuxedInVideo) {
this.needSplitMuxedContent_ = true;
}
}
/**
* Initialize a specific SourceBuffer.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {shaka.extern.Stream} stream
* @param {string} codecs
* @return {!Promise}
* @private
*/
async initSourceBuffer_(contentType, stream, codecs) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
goog.asserts.assert(
await shaka.media.MediaSourceEngine.isStreamSupported(
stream, contentType),
'Type negotiation should happen before MediaSourceEngine.init!');
let mimeType = shaka.util.MimeUtils.getFullType(
stream.mimeType, codecs);
if (contentType == ContentType.TEXT) {
this.reinitText(mimeType, this.sequenceMode_, stream.external);
} else {
let needTransmux = this.config_.forceTransmux;
if (!shaka.media.Capabilities.isTypeSupported(mimeType) ||
(!this.sequenceMode_ &&
shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType))) {
needTransmux = true;
}
const mimeTypeWithAllCodecs =
shaka.util.MimeUtils.getFullTypeWithAllCodecs(
stream.mimeType, codecs);
if (needTransmux) {
const audioCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
ContentType.AUDIO, (codecs || '').split(','));
const videoCodec = shaka.util.ManifestParserUtils.guessCodecsSafe(
ContentType.VIDEO, (codecs || '').split(','));
if (audioCodec && videoCodec) {
this.needSplitMuxedContent_ = true;
await this.initSourceBuffer_(ContentType.AUDIO, stream, audioCodec);
await this.initSourceBuffer_(ContentType.VIDEO, stream, videoCodec);
return;
}
const transmuxerPlugin = shaka.transmuxer.TransmuxerEngine
.findTransmuxer(mimeTypeWithAllCodecs);
if (transmuxerPlugin) {
const transmuxer = transmuxerPlugin();
this.transmuxers_[contentType] = transmuxer;
mimeType =
transmuxer.convertCodecs(contentType, mimeTypeWithAllCodecs);
}
}
const type = this.addExtraFeaturesToMimeType_(mimeType);
this.destroyer_.ensureNotDestroyed();
let sourceBuffer;
try {
sourceBuffer = this.mediaSource_.addSourceBuffer(type);
} catch (exception) {
throw new shaka.util.Error(
shaka.util.Error.Severity.CRITICAL,
shaka.util.Error.Category.MEDIA,
shaka.util.Error.Code.MEDIA_SOURCE_OPERATION_THREW,
exception,
'The mediaSource_ status was ' + this.mediaSource_.readyState +
' expected \'open\'',
null);
}
if (this.sequenceMode_) {
sourceBuffer.mode =
shaka.media.MediaSourceEngine.SourceBufferMode_.SEQUENCE;
}
this.eventManager_.listen(
sourceBuffer, 'error',
() => this.onError_(contentType));
this.eventManager_.listen(
sourceBuffer, 'updateend',
() => this.onUpdateEnd_(contentType));
this.sourceBuffers_[contentType] = sourceBuffer;
this.sourceBufferTypes_[contentType] = mimeType;
this.expectedEncryption_[contentType] = !!stream.drmInfos.length;
}
}
/**
* Called by the Player to provide an updated configuration any time it
* changes. Must be called at least once before init().
*
* @param {shaka.extern.MediaSourceConfiguration} config
*/
configure(config) {
this.config_ = config;
if (this.textEngine_) {
this.textEngine_.setModifyCueCallback(config.modifyCueCallback);
}
}
/**
* Indicate if the streaming is allowed by MediaSourceEngine.
* If we using MediaSource we always returns true.
*
* @return {boolean}
*/
isStreamingAllowed() {
return this.streamingAllowed_ && !this.usingRemotePlayback_ &&
!this.reloadingMediaSource_;
}
/**
* Reinitialize the TextEngine for a new text type.
* @param {string} mimeType
* @param {boolean} sequenceMode
* @param {boolean} external
*/
reinitText(mimeType, sequenceMode, external) {
if (!this.textEngine_) {
this.textEngine_ = new shaka.text.TextEngine(this.textDisplayer_);
if (this.textEngine_) {
this.textEngine_.setModifyCueCallback(this.config_.modifyCueCallback);
}
}
this.textEngine_.initParser(mimeType, sequenceMode,
external || this.segmentRelativeVttTiming_, this.manifestType_);
}
/**
* @return {boolean} True if the MediaSource is in an "ended" state, or if the
* object has been destroyed.
*/
ended() {
if (this.reloadingMediaSource_) {
return false;
}
return this.mediaSource_ ? this.mediaSource_.readyState == 'ended' : true;
}
/**
* @return {boolean} True if the MediaSource is in an "closed" state, or if
* the object has been destroyed.
*/
closed() {
if (this.reloadingMediaSource_) {
return false;
}
return this.mediaSource_ ? this.mediaSource_.readyState == 'closed' : true;
}
/**
* Gets the first timestamp in buffer for the given content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {?number} The timestamp in seconds, or null if nothing is buffered.
*/
bufferStart(contentType) {
if (!Object.keys(this.sourceBuffers_).length) {
return null;
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferStart();
}
return shaka.media.TimeRangesUtils.bufferStart(
this.getBuffered_(contentType));
}
/**
* Gets the last timestamp in buffer for the given content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {?number} The timestamp in seconds, or null if nothing is buffered.
*/
bufferEnd(contentType) {
if (!Object.keys(this.sourceBuffers_).length) {
return null;
}
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferEnd();
}
return shaka.media.TimeRangesUtils.bufferEnd(
this.getBuffered_(contentType));
}
/**
* Determines if the given time is inside the buffered range of the given
* content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {number} time Playhead time
* @return {boolean}
*/
isBuffered(contentType, time) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.isBuffered(time);
} else {
const buffered = this.getBuffered_(contentType);
return shaka.media.TimeRangesUtils.isBuffered(buffered, time);
}
}
/**
* Computes how far ahead of the given timestamp is buffered for the given
* content type.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {number} time
* @return {number} The amount of time buffered ahead in seconds.
*/
bufferedAheadOf(contentType, time) {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
if (contentType == ContentType.TEXT) {
return this.textEngine_.bufferedAheadOf(time);
} else {
const buffered = this.getBuffered_(contentType);
return shaka.media.TimeRangesUtils.bufferedAheadOf(buffered, time);
}
}
/**
* Returns info about what is currently buffered.
* @return {shaka.extern.BufferedInfo}
*/
getBufferedInfo() {
const ContentType = shaka.util.ManifestParserUtils.ContentType;
const TimeRangesUtils = shaka.media.TimeRangesUtils;
const info = {
total: this.reloadingMediaSource_ ? [] :
TimeRangesUtils.getBufferedInfo(this.video_.buffered),
audio:
TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.AUDIO)),
video:
TimeRangesUtils.getBufferedInfo(this.getBuffered_(ContentType.VIDEO)),
text: [],
};
if (this.textEngine_) {
const start = this.textEngine_.bufferStart();
const end = this.textEngine_.bufferEnd();
if (start != null && end != null) {
info.text.push({start: start, end: end});
}
}
return info;
}
/**
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @return {TimeRanges} The buffered ranges for the given content type, or
* null if the buffered ranges could not be obtained.
* @private
*/
getBuffered_(contentType) {
if (this.reloadingMediaSource_ || this.usingRemotePlayback_) {
return null;
}
try {
return this.sourceBuffers_[contentType].buffered;
} catch (exception) {
if (contentType in this.sourceBuffers_) {
// Note: previous MediaSource errors may cause access to |buffered| to
// throw.
shaka.log.error('failed to get buffered range for ' + contentType,
exception);
}
return null;
}
}
/**
* Create a new closed caption parser. This will ONLY be replaced by tests as
* a way to inject fake closed caption parser instances.
*
* @param {string} mimeType
* @return {!shaka.media.IClosedCaptionParser}
*/
getCaptionParser(mimeType) {
return new shaka.media.ClosedCaptionParser(mimeType);
}
/**
* This method is only public for testing.
*
* @param {shaka.util.ManifestParserUtils.ContentType} contentType
* @param {!BufferSource} data
* @param {!shaka.media.SegmentReference} reference The segment reference
* we are appending
* @param {shaka.extern.Stream} stream
* @param {!string} mimeType
* @return {{timestamp: ?number, metadata: !Array<shaka.extern.ID3Metadata>}}
*/
getTimestampAndDispatchMetadata(contentType, data, reference, stream,
mimeType) {
let timestamp = null;
let metadata = [];
const uint8ArrayData = shaka.util.BufferUtils.toUint8(data);
if (shaka.util.MimeUtils.RAW_FORMATS.includes(mimeType)) {
const frames = shaka.util.Id3Utils.getID3Frames(uint8ArrayData);
if (frames.length && reference) {
const metadataTimestamp = frames.find((frame) => {
return frame.description ===
'com.apple.streaming.transportStreamTimestamp';
});
if (metadataTimestamp) {
timestamp = Math.round(metadataTimestamp.data) / 1000;
}
/** @private {shaka.extern.ID3Metadata} */
const id3Metadata = {
cueTime: reference.startTime,
data: uint8ArrayData,
frames: frames,
dts: reference.startTime,
pts: reference.startTime,
};
this.playerInterface_.onMetadata(
[id3Metadata], /* offset= */ 0, reference.endTime);
}
} else if (mimeType.includes('/mp4') &&
reference &&
reference.initSegmentReference &&
reference.initSegmentReference.timescale) {
const timescale = reference.initSegmentReference.timescale;
if (!isNaN(timescale)) {
const hasEmsg = ((stream.emsgSchemeIdUris != null &&
stream.emsgSchemeIdUris.length > 0) ||
this.config_.dispatchAllEmsgBoxes);
const Mp4Parser = shaka.util.Mp4Parser;
let startTime = 0;
let parsedMedia = false;
const parser = new Mp4Parser();
if (hasEmsg) {
parser.fullBox('emsg', (box) =>
this.parseEMSG_(reference, stream.emsgSchemeIdUris, box));
}
parser.fullBox('prft', (box) => this.parsePrft_(timescale, box))
.box('moof', Mp4Parser.children)
.box('traf', Mp4Parser.children)
.fullBox('tfdt', (box) => {
if (!parsedMedia) {
goog.asserts.assert(
box.version == 0 || box.version == 1,
'TFDT version can only be 0 or 1');
const parsed = shaka.util.Mp4BoxParsers.parseTFDTInaccurate(
box.reader, box.version);
startTime = parsed.baseMediaDecodeTime / timescale;
parsedMedia = true;
if (!hasEmsg) {
box.parser.stop();
}
}
}).parse(data, /* partialOkay= */ true);
if (parsedMedia && reference.timestampOffset == 0) {
timestamp = startTime;
}
}
} else if (!mimeType.includes('/mp4') && !mimeType.includes('/webm') &&
shaka.util.TsParser.probe(uint8ArrayData)) {
if (!this.tsParsers_[contentType]) {
this.tsParsers_[contentType] = new shaka.util.TsParser();
} else {
this.tsParsers_[contentType].clearData();
}
const tsParser = this.tsParsers_[contentType].parse(uint8ArrayData);
const startTime = tsParser.getStartTime(contentType);
if (startTime != null) {
timestamp = startTime;
}
metadata = tsParser.getMetadata();
}
return {timestamp, metadata};
}
/**
* Parse the EMSG box from a MP4 container.
*
* @param {!shaka.media.SegmentReference} reference
* @param {?Array<string>} emsgSchemeIdUris Array of emsg
* scheme_id_uri for which emsg boxes should be parsed.
* @param {!shaka.extern.ParsedBox} box
* @private
* https://dashif-documents.azurewebsites.net/Events/master/event.html#emsg-format
* aligned(8) class DASHEventMessageBox
* extends FullBox(‘emsg’, version, flags = 0){
* if (version==0) {
* string scheme_id_uri;
* string value;