summaryrefslogtreecommitdiff
path: root/dom/media/VideoUtils.cpp
blob: cc8d56146099fa36dc25386ab5a37480af65cae7 (plain)
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
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "VideoUtils.h"

#include "mozilla/Base64.h"
#include "mozilla/TaskQueue.h"
#include "mozilla/Function.h"

#include "MediaContentType.h"
#include "MediaPrefs.h"
#include "MediaResource.h"
#include "TimeUnits.h"
#include "nsMathUtils.h"
#include "nsSize.h"
#include "VorbisUtils.h"
#include "ImageContainer.h"
#include "mozilla/SharedThreadPool.h"
#include "nsIRandomGenerator.h"
#include "nsIServiceManager.h"
#include "nsServiceManagerUtils.h"
#include "nsIConsoleService.h"
#include "nsThreadUtils.h"
#include "nsCharSeparatedTokenizer.h"
#include "nsContentTypeParser.h"

#include <stdint.h>

namespace mozilla {

NS_NAMED_LITERAL_CSTRING(kEMEKeySystemClearkey, "org.w3.clearkey");
NS_NAMED_LITERAL_CSTRING(kEMEKeySystemWidevine, "com.widevine.alpha");

using layers::PlanarYCbCrImage;

CheckedInt64 SaferMultDiv(int64_t aValue, uint32_t aMul, uint32_t aDiv) {
  int64_t major = aValue / aDiv;
  int64_t remainder = aValue % aDiv;
  return CheckedInt64(remainder) * aMul / aDiv + CheckedInt64(major) * aMul;
}

// Converts from number of audio frames to microseconds, given the specified
// audio rate.
CheckedInt64 FramesToUsecs(int64_t aFrames, uint32_t aRate) {
  return SaferMultDiv(aFrames, USECS_PER_S, aRate);
}

media::TimeUnit FramesToTimeUnit(int64_t aFrames, uint32_t aRate) {
  int64_t major = aFrames / aRate;
  int64_t remainder = aFrames % aRate;
  return media::TimeUnit::FromMicroseconds(major) * USECS_PER_S +
    (media::TimeUnit::FromMicroseconds(remainder) * USECS_PER_S) / aRate;
}

// Converts from microseconds to number of audio frames, given the specified
// audio rate.
CheckedInt64 UsecsToFrames(int64_t aUsecs, uint32_t aRate) {
  return SaferMultDiv(aUsecs, aRate, USECS_PER_S);
}

// Format TimeUnit as number of frames at given rate.
CheckedInt64 TimeUnitToFrames(const media::TimeUnit& aTime, uint32_t aRate) {
  return UsecsToFrames(aTime.ToMicroseconds(), aRate);
}

nsresult SecondsToUsecs(double aSeconds, int64_t& aOutUsecs) {
  if (aSeconds * double(USECS_PER_S) > INT64_MAX) {
    return NS_ERROR_FAILURE;
  }
  aOutUsecs = int64_t(aSeconds * double(USECS_PER_S));
  return NS_OK;
}

static int32_t ConditionDimension(float aValue)
{
  // This will exclude NaNs and too-big values.
  if (aValue > 1.0 && aValue <= INT32_MAX)
    return int32_t(NS_round(aValue));
  return 0;
}

void ScaleDisplayByAspectRatio(nsIntSize& aDisplay, float aAspectRatio)
{
  if (aAspectRatio > 1.0) {
    // Increase the intrinsic width
    aDisplay.width = ConditionDimension(aAspectRatio * aDisplay.width);
  } else {
    // Increase the intrinsic height
    aDisplay.height = ConditionDimension(aDisplay.height / aAspectRatio);
  }
}

static int64_t BytesToTime(int64_t offset, int64_t length, int64_t durationUs) {
  NS_ASSERTION(length > 0, "Must have positive length");
  double r = double(offset) / double(length);
  if (r > 1.0)
    r = 1.0;
  return int64_t(double(durationUs) * r);
}

media::TimeIntervals GetEstimatedBufferedTimeRanges(mozilla::MediaResource* aStream,
                                                    int64_t aDurationUsecs)
{
  media::TimeIntervals buffered;
  // Nothing to cache if the media takes 0us to play.
  if (aDurationUsecs <= 0 || !aStream)
    return buffered;

  // Special case completely cached files.  This also handles local files.
  if (aStream->IsDataCachedToEndOfResource(0)) {
    buffered +=
      media::TimeInterval(media::TimeUnit::FromMicroseconds(0),
                          media::TimeUnit::FromMicroseconds(aDurationUsecs));
    return buffered;
  }

  int64_t totalBytes = aStream->GetLength();

  // If we can't determine the total size, pretend that we have nothing
  // buffered. This will put us in a state of eternally-low-on-undecoded-data
  // which is not great, but about the best we can do.
  if (totalBytes <= 0)
    return buffered;

  int64_t startOffset = aStream->GetNextCachedData(0);
  while (startOffset >= 0) {
    int64_t endOffset = aStream->GetCachedDataEnd(startOffset);
    // Bytes [startOffset..endOffset] are cached.
    NS_ASSERTION(startOffset >= 0, "Integer underflow in GetBuffered");
    NS_ASSERTION(endOffset >= 0, "Integer underflow in GetBuffered");

    int64_t startUs = BytesToTime(startOffset, totalBytes, aDurationUsecs);
    int64_t endUs = BytesToTime(endOffset, totalBytes, aDurationUsecs);
    if (startUs != endUs) {
      buffered +=
        media::TimeInterval(media::TimeUnit::FromMicroseconds(startUs),

                              media::TimeUnit::FromMicroseconds(endUs));
    }
    startOffset = aStream->GetNextCachedData(endOffset);
  }
  return buffered;
}

void DownmixStereoToMono(mozilla::AudioDataValue* aBuffer,
                         uint32_t aFrames)
{
  MOZ_ASSERT(aBuffer);
  const int channels = 2;
  for (uint32_t fIdx = 0; fIdx < aFrames; ++fIdx) {
#ifdef MOZ_SAMPLE_TYPE_FLOAT32
    float sample = 0.0;
#else
    int sample = 0;
#endif
    // The sample of the buffer would be interleaved.
    sample = (aBuffer[fIdx*channels] + aBuffer[fIdx*channels + 1]) * 0.5;
    aBuffer[fIdx*channels] = aBuffer[fIdx*channels + 1] = sample;
  }
}

bool
IsVideoContentType(const nsCString& aContentType)
{
  NS_NAMED_LITERAL_CSTRING(video, "video");
  if (FindInReadable(video, aContentType)) {
    return true;
  }
  return false;
}

bool
IsValidVideoRegion(const nsIntSize& aFrame, const nsIntRect& aPicture,
                   const nsIntSize& aDisplay)
{
  return
    aFrame.width <= PlanarYCbCrImage::MAX_DIMENSION &&
    aFrame.height <= PlanarYCbCrImage::MAX_DIMENSION &&
    aFrame.width * aFrame.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
    aFrame.width * aFrame.height != 0 &&
    aPicture.width <= PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.x < PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.x + aPicture.width < PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.height <= PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.y < PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.y + aPicture.height < PlanarYCbCrImage::MAX_DIMENSION &&
    aPicture.width * aPicture.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
    aPicture.width * aPicture.height != 0 &&
    aDisplay.width <= PlanarYCbCrImage::MAX_DIMENSION &&
    aDisplay.height <= PlanarYCbCrImage::MAX_DIMENSION &&
    aDisplay.width * aDisplay.height <= MAX_VIDEO_WIDTH * MAX_VIDEO_HEIGHT &&
    aDisplay.width * aDisplay.height != 0;
}

already_AddRefed<SharedThreadPool> GetMediaThreadPool(MediaThreadType aType)
{
  const char *name;
  switch (aType) {
    case MediaThreadType::PLATFORM_DECODER:
      name = "MediaPDecoder";
      break;
    default:
      MOZ_FALLTHROUGH_ASSERT("Unexpected MediaThreadType");
    case MediaThreadType::PLAYBACK:
      name = "MediaPlayback";
      break;
  }
  RefPtr<SharedThreadPool> pool = SharedThreadPool::
    Get(nsDependentCString(name), MediaPrefs::MediaThreadPoolDefaultCount());

  // Ensure a larger stack for platform decoder threads
  if (aType == MediaThreadType::PLATFORM_DECODER) {
    const uint32_t minStackSize = 512*1024;
    uint32_t stackSize;
    MOZ_ALWAYS_SUCCEEDS(pool->GetThreadStackSize(&stackSize));
    if (stackSize < minStackSize) {
      MOZ_ALWAYS_SUCCEEDS(pool->SetThreadStackSize(minStackSize));
    }
  }

  return pool.forget();
}

bool
ExtractVPXCodecDetails(const nsAString& aCodec,
                       uint8_t& aProfile,
                       uint8_t& aLevel,
                       uint8_t& aBitDepth)
{
  uint8_t dummyChromaSubsampling = 1;
  VideoColorSpace dummyColorspace;
  return ExtractVPXCodecDetails(aCodec,
                                aProfile,
                                aLevel,
                                aBitDepth,
                                dummyChromaSubsampling,
                                dummyColorspace);
}

bool ExtractVPXCodecDetails(const nsAString& aCodec,
                            uint8_t& aProfile,
                            uint8_t& aLevel,
                            uint8_t& aBitDepth,
                            uint8_t& aChromaSubsampling,
                            VideoColorSpace& aColorSpace)
{
  nsTArray<nsString> fieldsArr;

  // Assign default value.
  aChromaSubsampling = 1;
  
  nsCharSeparatedTokenizer tokenizer(aCodec, '.');
  while (tokenizer.hasMoreTokens()) {
    const nsSubstring& token = tokenizer.nextToken();
    fieldsArr.AppendElement(token);
  }
  auto fourCC = fieldsArr[0];

  if (!fourCC.EqualsLiteral("vp09") && !fourCC.EqualsLiteral("vp08")) {
    // Invalid 4CC
    return false;
  }
  uint8_t *fields[] = { &aProfile, &aLevel, &aBitDepth, &aChromaSubsampling,
                        &aColorSpace.mPrimaryId, &aColorSpace.mTransferId,
                        &aColorSpace.mMatrixId, &aColorSpace.mRangeId };
  int fieldsCount = 0;
  nsresult rv;
  for (int fieldsItr = 1; fieldsItr < fieldsArr.Length(); ++fieldsItr, ++fieldsCount) {
    if (fieldsCount > 7) {
      // No more than 8 fields are expected.
      return false;
    }
    *(fields[fieldsCount]) =
      static_cast<uint8_t>(fieldsArr[fieldsItr].ToInteger(&rv));
    // We got invalid field value, parsing error.
    NS_ENSURE_SUCCESS(rv, false);
  }
  // Mandatory Fields
  // <sample entry 4CC>.<profile>.<level>.<bitDepth>.
  // Optional Fields
  // <chromaSubsampling>.<colourPrimaries>.<transferCharacteristics>.
  // <matrixCoefficients>.<videoFullRangeFlag>
  // First three fields are mandatory(we have parsed 4CC).
  if (fieldsCount < 3) {
    // Invalid number of fields.
    return false;
  }
  // Start to validate the parsing value.

  // profile should be 0,1,2 or 3.
  // See https://www.webmproject.org/vp9/profiles/
  // We don't support more than profile 2
  if (aProfile > 2) {
    // Invalid profile.
    return false;
  }

 // level, See https://www.webmproject.org/vp9/mp4/#semantics_1
  switch (aLevel) {
    case 10:
    case 11:
    case 20:
    case 21:
    case 30:
    case 31:
    case 40:
    case 41:
    case 50:
    case 51:
    case 52:
    case 60:
    case 61:
    case 62:
      break;
    default:
      // Invalid level.
      return false;
  }

  if (aBitDepth != 8 && aBitDepth != 10 && aBitDepth != 12) {
    // Invalid bitDepth:
    return false;
  }

  if (fieldsCount == 3) {
    // No more options.
    return true;
  }

  // chromaSubsampling should be 0,1,2,3...4~7 are reserved.
  if (aChromaSubsampling > 3) {
    return false;
  }

  if (fieldsCount == 4) {
    // No more options.
    return true;
  }

  // It is an integer that is defined by the "Colour primaries"
  // section of ISO/IEC 23001-8:2016 Table 2.
  // We treat reserved value as false case.
  const auto& primaryId = aColorSpace.mPrimaryId;
  if (primaryId == 0 || primaryId == 3 || primaryId > 22) {
    // reserved value.
    return false;
  }
  if (primaryId > 12 && primaryId < 22) {
    // 13~21 are reserved values.
    return false;
  }

  if (fieldsCount == 5) {
    // No more options.
    return true;
  }

  // It is an integer that is defined by the
  // "Transfer characteristics" section of ISO/IEC 23001-8:2016 Table 3.
  // We treat reserved value as false case.
  const auto& transferId = aColorSpace.mTransferId;
  if (transferId == 0 || transferId == 3 || transferId > 18) {
    // reserved value.
    return false;
  }

  if (fieldsCount == 6) {
    // No more options.
    return true;
  }

  // It is an integer that is defined by the
  // "Matrix coefficients" section of ISO/IEC 23001-8:2016 Table 4.
  // We treat reserved value as false case.
  const auto& matrixId = aColorSpace.mMatrixId;
  if (matrixId == 3 || matrixId > 11) {
    return false;
  }

  // If matrixCoefficients is 0 (RGB), then chroma subsampling MUST be 3 (4:4:4).
  if (matrixId == 0 && aChromaSubsampling != 3) {
    return false;
  }

  if (fieldsCount == 7) {
    // No more options.
    return true;
  }

  // videoFullRangeFlag indicates the black level and range of the luma and
  // chroma signals. 0 = legal range (e.g. 16-235 for 8 bit sample depth);
  // 1 = full range (e.g. 0-255 for 8-bit sample depth).
  const auto& rangeId = aColorSpace.mRangeId;
  return rangeId <= 1;
}

bool
ExtractH264CodecDetails(const nsAString& aCodec,
                        int16_t& aProfile,
                        int16_t& aLevel)
{
  // H.264 codecs parameters have a type defined as avcN.PPCCLL, where
  // N = avc type. avc3 is avcc with SPS & PPS implicit (within stream)
  // PP = profile_idc, CC = constraint_set flags, LL = level_idc.
  // We ignore the constraint_set flags, as it's not clear from any
  // documentation what constraints the platform decoders support.
  // See http://blog.pearce.org.nz/2013/11/what-does-h264avc1-codecs-parameters.html
  // for more details.
  if (aCodec.Length() != strlen("avc1.PPCCLL")) {
    return false;
  }

  // Verify the codec starts with "avc1." or "avc3.".
  const nsAString& sample = Substring(aCodec, 0, 5);
  if (!sample.EqualsASCII("avc1.") && !sample.EqualsASCII("avc3.")) {
    return false;
  }

  // Extract the profile_idc and level_idc.
  nsresult rv = NS_OK;
  aProfile = PromiseFlatString(Substring(aCodec, 5, 2)).ToInteger(&rv, 16);
  NS_ENSURE_SUCCESS(rv, false);

  aLevel = PromiseFlatString(Substring(aCodec, 9, 2)).ToInteger(&rv, 16);
  NS_ENSURE_SUCCESS(rv, false);

  if (aLevel == 9) {
    aLevel = H264_LEVEL_1_b;
  } else if (aLevel <= 5) {
    aLevel *= 10;
  }

  return true;
}

nsresult
GenerateRandomName(nsCString& aOutSalt, uint32_t aLength)
{
  nsresult rv;
  nsCOMPtr<nsIRandomGenerator> rg =
    do_GetService("@mozilla.org/security/random-generator;1", &rv);
  if (NS_FAILED(rv)) return rv;

  // For each three bytes of random data we will get four bytes of ASCII.
  const uint32_t requiredBytesLength =
    static_cast<uint32_t>((aLength + 3) / 4 * 3);

  uint8_t* buffer;
  rv = rg->GenerateRandomBytes(requiredBytesLength, &buffer);
  if (NS_FAILED(rv)) return rv;

  nsAutoCString temp;
  nsDependentCSubstring randomData(reinterpret_cast<const char*>(buffer),
                                   requiredBytesLength);
  rv = Base64Encode(randomData, temp);
  free(buffer);
  buffer = nullptr;
  if (NS_FAILED (rv)) return rv;

  aOutSalt = temp;
  return NS_OK;
}

nsresult
GenerateRandomPathName(nsCString& aOutSalt, uint32_t aLength)
{
  nsresult rv = GenerateRandomName(aOutSalt, aLength);
  if (NS_FAILED(rv)) return rv;

  // Base64 characters are alphanumeric (a-zA-Z0-9) and '+' and '/', so we need
  // to replace illegal characters -- notably '/'
  aOutSalt.ReplaceChar(FILE_PATH_SEPARATOR FILE_ILLEGAL_CHARACTERS, '_');
  return NS_OK;
}

already_AddRefed<TaskQueue>
CreateMediaDecodeTaskQueue()
{
  RefPtr<TaskQueue> queue = new TaskQueue(
    GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER));
  return queue.forget();
}

void
SimpleTimer::Cancel() {
  if (mTimer) {
#ifdef DEBUG
    nsCOMPtr<nsIEventTarget> target;
    mTimer->GetTarget(getter_AddRefs(target));
    nsCOMPtr<nsIThread> thread(do_QueryInterface(target));
    MOZ_ASSERT(NS_GetCurrentThread() == thread);
#endif
    mTimer->Cancel();
    mTimer = nullptr;
  }
  mTask = nullptr;
}

NS_IMETHODIMP
SimpleTimer::Notify(nsITimer *timer) {
  RefPtr<SimpleTimer> deathGrip(this);
  if (mTask) {
    mTask->Run();
    mTask = nullptr;
  }
  return NS_OK;
}

nsresult
SimpleTimer::Init(nsIRunnable* aTask, uint32_t aTimeoutMs, nsIThread* aTarget)
{
  nsresult rv;

  // Get target thread first, so we don't have to cancel the timer if it fails.
  nsCOMPtr<nsIThread> target;
  if (aTarget) {
    target = aTarget;
  } else {
    rv = NS_GetMainThread(getter_AddRefs(target));
    if (NS_FAILED(rv)) {
      return rv;
    }
  }

  nsCOMPtr<nsITimer> timer = do_CreateInstance(NS_TIMER_CONTRACTID, &rv);
  if (NS_FAILED(rv)) {
    return rv;
  }
  // Note: set target before InitWithCallback in case the timer fires before
  // we change the event target.
  rv = timer->SetTarget(aTarget);
  if (NS_FAILED(rv)) {
    timer->Cancel();
    return rv;
  }
  rv = timer->InitWithCallback(this, aTimeoutMs, nsITimer::TYPE_ONE_SHOT);
  if (NS_FAILED(rv)) {
    return rv;
  }

  mTimer = timer.forget();
  mTask = aTask;
  return NS_OK;
}

NS_IMPL_ISUPPORTS(SimpleTimer, nsITimerCallback)

already_AddRefed<SimpleTimer>
SimpleTimer::Create(nsIRunnable* aTask, uint32_t aTimeoutMs, nsIThread* aTarget)
{
  RefPtr<SimpleTimer> t(new SimpleTimer());
  if (NS_FAILED(t->Init(aTask, aTimeoutMs, aTarget))) {
    return nullptr;
  }
  return t.forget();
}

void
LogToBrowserConsole(const nsAString& aMsg)
{
  if (!NS_IsMainThread()) {
    nsString msg(aMsg);
    nsCOMPtr<nsIRunnable> task =
      NS_NewRunnableFunction([msg]() { LogToBrowserConsole(msg); });
    NS_DispatchToMainThread(task.forget(), NS_DISPATCH_NORMAL);
    return;
  }
  nsCOMPtr<nsIConsoleService> console(
    do_GetService("@mozilla.org/consoleservice;1"));
  if (!console) {
    NS_WARNING("Failed to log message to console.");
    return;
  }
  nsAutoString msg(aMsg);
  console->LogStringMessage(msg.get());
}

bool
ParseCodecsString(const nsAString& aCodecs, nsTArray<nsString>& aOutCodecs)
{
  aOutCodecs.Clear();
  bool expectMoreTokens = false;
  nsCharSeparatedTokenizer tokenizer(aCodecs, ',');
  while (tokenizer.hasMoreTokens()) {
    const nsSubstring& token = tokenizer.nextToken();
    expectMoreTokens = tokenizer.separatorAfterCurrentToken();
    aOutCodecs.AppendElement(token);
  }
  if (expectMoreTokens) {
    // Last codec name was empty
    return false;
  }
  return true;
}

bool
ParseMIMETypeString(const nsAString& aMIMEType,
                    nsString& aOutContainerType,
                    nsTArray<nsString>& aOutCodecs)
{
  nsContentTypeParser parser(aMIMEType);
  nsresult rv = parser.GetType(aOutContainerType);
  if (NS_FAILED(rv)) {
    return false;
  }

  nsString codecsStr;
  parser.GetParameter("codecs", codecsStr);
  return ParseCodecsString(codecsStr, aOutCodecs);
}

template <int N>
static bool
StartsWith(const nsACString& string, const char (&prefix)[N])
{
    if (N - 1 > string.Length()) {
      return false;
    }
    return memcmp(string.Data(), prefix, N - 1) == 0;
}

bool
IsH264CodecString(const nsAString& aCodec)
{
  int16_t profile = 0;
  int16_t level = 0;
  return ExtractH264CodecDetails(aCodec, profile, level);
}

bool
IsAACCodecString(const nsAString& aCodec)
{
  return
    aCodec.EqualsLiteral("mp4a.40.2") || // MPEG4 AAC-LC
    aCodec.EqualsLiteral("mp4a.40.5") || // MPEG4 HE-AAC
    aCodec.EqualsLiteral("mp4a.67") || // MPEG2 AAC-LC
    aCodec.EqualsLiteral("mp4a.40.29");  // MPEG4 HE-AACv2
}

bool
IsVP8CodecString(const nsAString& aCodec)
{
  uint8_t profile = 0;
  uint8_t level = 0;
  uint8_t bitDepth = 0;
  return aCodec.EqualsLiteral("vp8") ||
         aCodec.EqualsLiteral("vp8.0") ||
         (StartsWith(NS_ConvertUTF16toUTF8(aCodec), "vp08") &&
          ExtractVPXCodecDetails(aCodec, profile, level, bitDepth));
}

bool
IsVP9CodecString(const nsAString& aCodec)
{
  uint8_t profile = 0;
  uint8_t level = 0;
  uint8_t bitDepth = 0;
  return aCodec.EqualsLiteral("vp9") ||
         aCodec.EqualsLiteral("vp9.0") ||
         (StartsWith(NS_ConvertUTF16toUTF8(aCodec), "vp09") &&
          ExtractVPXCodecDetails(aCodec, profile, level, bitDepth));
}

#ifdef MOZ_AV1
bool
IsAV1CodecString(const nsAString& aCodec)
{
  return aCodec.EqualsLiteral("av1") ||
    StartsWith(NS_ConvertUTF16toUTF8(aCodec), "av01");
}
#endif

UniquePtr<TrackInfo>
CreateTrackInfoWithMIMEType(const nsACString& aCodecMIMEType)
{
  UniquePtr<TrackInfo> trackInfo;
  if (StartsWith(aCodecMIMEType, "audio/")) {
    trackInfo.reset(new AudioInfo());
    trackInfo->mMimeType = aCodecMIMEType;
  } else if (StartsWith(aCodecMIMEType, "video/")) {
    trackInfo.reset(new VideoInfo());
    trackInfo->mMimeType = aCodecMIMEType;
  }
  return trackInfo;
}

UniquePtr<TrackInfo>
CreateTrackInfoWithMIMETypeAndContentTypeExtraParameters(
  const nsACString& aCodecMIMEType,
  const MediaContentType& aContentType)
{
  UniquePtr<TrackInfo> trackInfo = CreateTrackInfoWithMIMEType(aCodecMIMEType);
  if (trackInfo) {
    VideoInfo* videoInfo = trackInfo->GetAsVideoInfo();
    if (videoInfo) {
      Maybe<int32_t> maybeWidth = aContentType.GetWidth();
      if (maybeWidth && *maybeWidth > 0) {
        videoInfo->mImage.width = *maybeWidth;
      }
      Maybe<int32_t> maybeHeight = aContentType.GetHeight();
      if (maybeHeight && *maybeHeight > 0) {
        videoInfo->mImage.height = *maybeHeight;
      }
    }
  }
  return trackInfo;
}

} // end namespace mozilla