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
|
// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/filters/stream_parser_factory.h"
#include <stddef.h>
#include "base/command_line.h"
#include "base/macros.h"
#include "base/metrics/histogram.h"
#include "base/strings/pattern.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "media/base/media.h"
#include "media/base/media_switches.h"
#include "media/formats/mpeg/adts_stream_parser.h"
#include "media/formats/mpeg/mpeg1_audio_stream_parser.h"
#include "media/formats/webm/webm_stream_parser.h"
#include "media/media_features.h"
#if defined(OS_ANDROID)
#include "media/base/android/media_codec_util.h"
#endif
#if defined(USE_PROPRIETARY_CODECS)
#if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
#include "media/formats/mp2t/mp2t_stream_parser.h"
#endif
#include "media/formats/mp4/es_descriptor.h"
#include "media/formats/mp4/mp4_stream_parser.h"
#endif
namespace media {
typedef bool (*CodecIDValidatorFunction)(
const std::string& codecs_id,
const scoped_refptr<MediaLog>& media_log);
struct CodecInfo {
enum Type {
UNKNOWN,
AUDIO,
VIDEO
};
// Update tools/metrics/histograms/histograms.xml if new values are added.
enum HistogramTag {
HISTOGRAM_UNKNOWN,
HISTOGRAM_VP8,
HISTOGRAM_VP9,
HISTOGRAM_VORBIS,
HISTOGRAM_H264,
HISTOGRAM_MPEG2AAC,
HISTOGRAM_MPEG4AAC,
HISTOGRAM_EAC3,
HISTOGRAM_MP3,
HISTOGRAM_OPUS,
HISTOGRAM_HEVC,
HISTOGRAM_AC3,
HISTOGRAM_MAX = HISTOGRAM_AC3 // Must be equal to largest logged entry.
};
const char* pattern;
Type type;
CodecIDValidatorFunction validator;
HistogramTag tag;
};
typedef StreamParser* (*ParserFactoryFunction)(
const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log);
struct SupportedTypeInfo {
const char* type;
const ParserFactoryFunction factory_function;
const CodecInfo** codecs;
};
static const CodecInfo kVP8CodecInfo = { "vp8", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_VP8 };
static const CodecInfo kVP9CodecInfo = { "vp9", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_VP9 };
static const CodecInfo kVorbisCodecInfo = { "vorbis", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_VORBIS };
static const CodecInfo kOpusCodecInfo = { "opus", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_OPUS };
static const CodecInfo* kVideoWebMCodecs[] = {
&kVP8CodecInfo,
&kVP9CodecInfo,
&kVorbisCodecInfo,
&kOpusCodecInfo,
NULL
};
static const CodecInfo* kAudioWebMCodecs[] = {
&kVorbisCodecInfo,
&kOpusCodecInfo,
NULL
};
static StreamParser* BuildWebMParser(const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log) {
return new WebMStreamParser();
}
#if defined(USE_PROPRIETARY_CODECS)
// AAC Object Type IDs that Chrome supports.
static const int kAACLCObjectType = 2;
static const int kAACSBRObjectType = 5;
static const int kAACPSObjectType = 29;
static int GetMP4AudioObjectType(const std::string& codec_id,
const scoped_refptr<MediaLog>& media_log) {
// From RFC 6381 section 3.3 (ISO Base Media File Format Name Space):
// When the first element of a ['codecs' parameter value] is 'mp4a' ...,
// the second element is a hexadecimal representation of the MP4 Registration
// Authority ObjectTypeIndication (OTI). Note that MP4RA uses a leading "0x"
// with these values, which is omitted here and hence implied.
std::vector<base::StringPiece> tokens = base::SplitStringPiece(
codec_id, ".", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
if (tokens.size() == 3 && tokens[0] == "mp4a" && tokens[1] == "40") {
// From RFC 6381 section 3.3:
// One of the OTI values for 'mp4a' is 40 (identifying MPEG-4 audio). For
// this value, the third element identifies the audio ObjectTypeIndication
// (OTI) ... expressed as a decimal number.
int audio_object_type;
if (base::StringToInt(tokens[2], &audio_object_type))
return audio_object_type;
}
MEDIA_LOG(DEBUG, media_log) << "Malformed mimetype codec '" << codec_id
<< "'";
return -1;
}
bool ValidateMP4ACodecID(const std::string& codec_id,
const scoped_refptr<MediaLog>& media_log) {
int audio_object_type = GetMP4AudioObjectType(codec_id, media_log);
if (audio_object_type == kAACLCObjectType ||
audio_object_type == kAACSBRObjectType ||
audio_object_type == kAACPSObjectType) {
return true;
}
MEDIA_LOG(DEBUG, media_log) << "Unsupported audio object type "
<< audio_object_type << " in codec '" << codec_id
<< "'";
return false;
}
static const CodecInfo kH264AVC1CodecInfo = { "avc1.*", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_H264 };
static const CodecInfo kH264AVC3CodecInfo = { "avc3.*", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_H264 };
#if BUILDFLAG(ENABLE_HEVC_DEMUXING)
static const CodecInfo kHEVCHEV1CodecInfo = { "hev1.*", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_HEVC };
static const CodecInfo kHEVCHVC1CodecInfo = { "hvc1.*", CodecInfo::VIDEO, NULL,
CodecInfo::HISTOGRAM_HEVC };
#endif
static const CodecInfo kMPEG4AACCodecInfo = { "mp4a.40.*", CodecInfo::AUDIO,
&ValidateMP4ACodecID,
CodecInfo::HISTOGRAM_MPEG4AAC };
static const CodecInfo kMPEG2AACLCCodecInfo = { "mp4a.67", CodecInfo::AUDIO,
NULL,
CodecInfo::HISTOGRAM_MPEG2AAC };
#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
// The 'ac-3' and 'ec-3' are mime codec ids for AC3 and EAC3 according to
// http://www.mp4ra.org/codecs.html
// The object types for AC3 and EAC3 in MP4 container are 0xa5 and 0xa6, so
// according to RFC 6381 this corresponds to codec ids 'mp4a.A5' and 'mp4a.A6'.
// Codec ids with lower case oti (mp4a.a5 and mp4a.a6) are supported for
// backward compatibility.
static const CodecInfo kAC3CodecInfo1 = {"ac-3", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_AC3};
static const CodecInfo kAC3CodecInfo2 = {"mp4a.a5", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_AC3};
static const CodecInfo kAC3CodecInfo3 = {"mp4a.A5", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_AC3};
static const CodecInfo kEAC3CodecInfo1 = {"ec-3", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_EAC3};
static const CodecInfo kEAC3CodecInfo2 = {"mp4a.a6", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_EAC3};
static const CodecInfo kEAC3CodecInfo3 = {"mp4a.A6", CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_EAC3};
#endif
static const CodecInfo* kVideoMP4Codecs[] = {
&kH264AVC1CodecInfo, &kH264AVC3CodecInfo,
#if BUILDFLAG(ENABLE_HEVC_DEMUXING)
&kHEVCHEV1CodecInfo, &kHEVCHVC1CodecInfo,
#endif
&kMPEG4AACCodecInfo, &kMPEG2AACLCCodecInfo, NULL};
static const CodecInfo* kAudioMP4Codecs[] = {&kMPEG4AACCodecInfo,
&kMPEG2AACLCCodecInfo,
#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
&kAC3CodecInfo1,
&kAC3CodecInfo2,
&kAC3CodecInfo3,
&kEAC3CodecInfo1,
&kEAC3CodecInfo2,
&kEAC3CodecInfo3,
#endif
NULL};
static StreamParser* BuildMP4Parser(const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log) {
std::set<int> audio_object_types;
bool has_sbr = false;
for (size_t i = 0; i < codecs.size(); ++i) {
std::string codec_id = codecs[i];
if (base::MatchPattern(codec_id, kMPEG2AACLCCodecInfo.pattern)) {
audio_object_types.insert(mp4::kISO_13818_7_AAC_LC);
} else if (base::MatchPattern(codec_id, kMPEG4AACCodecInfo.pattern)) {
int audio_object_type = GetMP4AudioObjectType(codec_id, media_log);
DCHECK_GT(audio_object_type, 0);
audio_object_types.insert(mp4::kISO_14496_3);
if (audio_object_type == kAACSBRObjectType ||
audio_object_type == kAACPSObjectType) {
has_sbr = true;
break;
}
#if BUILDFLAG(ENABLE_AC3_EAC3_AUDIO_DEMUXING)
} else if (base::MatchPattern(codec_id, kAC3CodecInfo1.pattern) ||
base::MatchPattern(codec_id, kAC3CodecInfo2.pattern) ||
base::MatchPattern(codec_id, kAC3CodecInfo3.pattern)) {
audio_object_types.insert(mp4::kAC3);
} else if (base::MatchPattern(codec_id, kEAC3CodecInfo1.pattern) ||
base::MatchPattern(codec_id, kEAC3CodecInfo2.pattern) ||
base::MatchPattern(codec_id, kEAC3CodecInfo3.pattern)) {
audio_object_types.insert(mp4::kEAC3);
#endif
}
}
return new mp4::MP4StreamParser(audio_object_types, has_sbr);
}
static const CodecInfo kMP3CodecInfo = { NULL, CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_MP3 };
static const CodecInfo* kAudioMP3Codecs[] = {
&kMP3CodecInfo,
NULL
};
static StreamParser* BuildMP3Parser(const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log) {
return new MPEG1AudioStreamParser();
}
static const CodecInfo kADTSCodecInfo = { NULL, CodecInfo::AUDIO, NULL,
CodecInfo::HISTOGRAM_MPEG4AAC };
static const CodecInfo* kAudioADTSCodecs[] = {
&kADTSCodecInfo,
NULL
};
static StreamParser* BuildADTSParser(const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log) {
return new ADTSStreamParser();
}
#if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
static const CodecInfo* kVideoMP2TCodecs[] = {
&kH264AVC1CodecInfo,
&kH264AVC3CodecInfo,
&kMPEG4AACCodecInfo,
&kMPEG2AACLCCodecInfo,
NULL
};
static StreamParser* BuildMP2TParser(const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log) {
bool has_sbr = false;
for (size_t i = 0; i < codecs.size(); ++i) {
std::string codec_id = codecs[i];
if (base::MatchPattern(codec_id, kMPEG4AACCodecInfo.pattern)) {
int audio_object_type = GetMP4AudioObjectType(codec_id, media_log);
if (audio_object_type == kAACSBRObjectType ||
audio_object_type == kAACPSObjectType) {
has_sbr = true;
}
}
}
return new media::mp2t::Mp2tStreamParser(has_sbr);
}
#endif
#endif
static const SupportedTypeInfo kSupportedTypeInfo[] = {
{"video/webm", &BuildWebMParser, kVideoWebMCodecs},
{"audio/webm", &BuildWebMParser, kAudioWebMCodecs},
#if defined(USE_PROPRIETARY_CODECS)
{"audio/aac", &BuildADTSParser, kAudioADTSCodecs},
{"audio/mpeg", &BuildMP3Parser, kAudioMP3Codecs},
{"video/mp4", &BuildMP4Parser, kVideoMP4Codecs},
{"audio/mp4", &BuildMP4Parser, kAudioMP4Codecs},
#if BUILDFLAG(ENABLE_MSE_MPEG2TS_STREAM_PARSER)
{"video/mp2t", &BuildMP2TParser, kVideoMP2TCodecs},
#endif
#endif
};
// Verify that |codec_info| is supported on this platform.
//
// Returns true if |codec_info| is a valid audio/video codec and is allowed.
// |audio_codecs| has |codec_info|.tag added to its list if |codec_info| is an
// audio codec. |audio_codecs| may be NULL, in which case it is not updated.
// |video_codecs| has |codec_info|.tag added to its list if |codec_info| is a
// video codec. |video_codecs| may be NULL, in which case it is not updated.
//
// Returns false otherwise, and |audio_codecs| and |video_codecs| not touched.
static bool VerifyCodec(
const CodecInfo* codec_info,
std::vector<CodecInfo::HistogramTag>* audio_codecs,
std::vector<CodecInfo::HistogramTag>* video_codecs) {
switch (codec_info->type) {
case CodecInfo::AUDIO:
if (audio_codecs)
audio_codecs->push_back(codec_info->tag);
return true;
case CodecInfo::VIDEO:
#if defined(OS_ANDROID)
// TODO(wolenetz, dalecurtis): This should instead use MimeUtil() to avoid
// duplication of subtle Android behavior. http://crbug.com/587303.
if (codec_info->tag == CodecInfo::HISTOGRAM_H264) {
if (media::IsUnifiedMediaPipelineEnabledForMse() &&
!media::HasPlatformDecoderSupport()) {
return false;
}
if (!MediaCodecUtil::IsMediaCodecAvailable())
return false;
}
if (codec_info->tag == CodecInfo::HISTOGRAM_VP8 &&
!media::MediaCodecUtil::IsVp8DecoderAvailable() &&
!media::IsUnifiedMediaPipelineEnabledForMse()) {
return false;
}
if (codec_info->tag == CodecInfo::HISTOGRAM_VP9 &&
!media::PlatformHasVp9Support() &&
!media::IsUnifiedMediaPipelineEnabledForMse()) {
return false;
}
if (codec_info->tag == CodecInfo::HISTOGRAM_OPUS &&
!media::PlatformHasOpusSupport() &&
!media::IsUnifiedMediaPipelineEnabledForMse()) {
return false;
}
#endif
if (video_codecs)
video_codecs->push_back(codec_info->tag);
return true;
default:
// Not audio or video, so skip it.
DVLOG(1) << "CodecInfo type of " << codec_info->type
<< " should not be specified in a SupportedTypes list";
return false;
}
}
// Checks to see if the specified |type| and |codecs| list are supported.
//
// Returns true if |type| and all codecs listed in |codecs| are supported.
// |factory_function| contains a function that can build a StreamParser for this
// type. Value may be NULL, in which case it is not touched.
// |audio_codecs| is updated with the appropriate HistogramTags for matching
// audio codecs specified in |codecs|. Value may be NULL, in which case it is
// not touched.
// |video_codecs| is updated with the appropriate HistogramTags for matching
// video codecs specified in |codecs|. Value may be NULL, in which case it is
// not touched.
//
// Returns false otherwise. The values of |factory_function|, |audio_codecs|,
// and |video_codecs| are undefined.
static bool CheckTypeAndCodecs(
const std::string& type,
const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log,
ParserFactoryFunction* factory_function,
std::vector<CodecInfo::HistogramTag>* audio_codecs,
std::vector<CodecInfo::HistogramTag>* video_codecs) {
// Search for the SupportedTypeInfo for |type|.
for (size_t i = 0; i < arraysize(kSupportedTypeInfo); ++i) {
const SupportedTypeInfo& type_info = kSupportedTypeInfo[i];
if (type == type_info.type) {
if (codecs.empty()) {
const CodecInfo* codec_info = type_info.codecs[0];
if (codec_info && !codec_info->pattern &&
VerifyCodec(codec_info, audio_codecs, video_codecs)) {
if (factory_function)
*factory_function = type_info.factory_function;
return true;
}
MEDIA_LOG(DEBUG, media_log)
<< "A codecs parameter must be provided for '" << type << "'";
return false;
}
// Make sure all the codecs specified in |codecs| are
// in the supported type info.
for (size_t j = 0; j < codecs.size(); ++j) {
// Search the type info for a match.
bool found_codec = false;
std::string codec_id = codecs[j];
for (int k = 0; type_info.codecs[k]; ++k) {
if (base::MatchPattern(codec_id, type_info.codecs[k]->pattern) &&
(!type_info.codecs[k]->validator ||
type_info.codecs[k]->validator(codec_id, media_log))) {
found_codec =
VerifyCodec(type_info.codecs[k], audio_codecs, video_codecs);
break; // Since only 1 pattern will match, no need to check others.
}
}
if (!found_codec) {
MEDIA_LOG(DEBUG, media_log) << "Codec '" << codec_id
<< "' is not supported for '" << type
<< "'";
return false;
}
}
if (factory_function)
*factory_function = type_info.factory_function;
// All codecs were supported by this |type|.
return true;
}
}
// |type| didn't match any of the supported types.
return false;
}
bool StreamParserFactory::IsTypeSupported(
const std::string& type, const std::vector<std::string>& codecs) {
return CheckTypeAndCodecs(type, codecs, new MediaLog(), NULL, NULL, NULL);
}
scoped_ptr<StreamParser> StreamParserFactory::Create(
const std::string& type,
const std::vector<std::string>& codecs,
const scoped_refptr<MediaLog>& media_log,
bool* has_audio,
bool* has_video) {
scoped_ptr<StreamParser> stream_parser;
ParserFactoryFunction factory_function;
std::vector<CodecInfo::HistogramTag> audio_codecs;
std::vector<CodecInfo::HistogramTag> video_codecs;
*has_audio = false;
*has_video = false;
if (CheckTypeAndCodecs(type, codecs, media_log, &factory_function,
&audio_codecs, &video_codecs)) {
*has_audio = !audio_codecs.empty();
*has_video = !video_codecs.empty();
// Log the number of codecs specified, as well as the details on each one.
UMA_HISTOGRAM_COUNTS_100("Media.MSE.NumberOfTracks", codecs.size());
for (size_t i = 0; i < audio_codecs.size(); ++i) {
UMA_HISTOGRAM_ENUMERATION("Media.MSE.AudioCodec",
audio_codecs[i],
CodecInfo::HISTOGRAM_MAX + 1);
}
for (size_t i = 0; i < video_codecs.size(); ++i) {
UMA_HISTOGRAM_ENUMERATION("Media.MSE.VideoCodec",
video_codecs[i],
CodecInfo::HISTOGRAM_MAX + 1);
}
stream_parser.reset(factory_function(codecs, media_log));
}
return stream_parser;
}
} // namespace media
|