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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include <algorithm> | |
6 #include <iterator> | |
7 #include <map> | |
8 #include <string> | |
9 | |
10 #include "base/containers/hash_tables.h" | |
11 #include "base/lazy_instance.h" | |
12 #include "base/logging.h" | |
13 #include "base/stl_util.h" | |
14 #include "base/strings/string_number_conversions.h" | |
15 #include "base/strings/string_split.h" | |
16 #include "base/strings/string_util.h" | |
17 #include "media/base/mime_util.h" | |
18 | |
19 #if defined(OS_ANDROID) | |
20 #include "base/android/build_info.h" | |
21 #endif | |
22 | |
23 namespace media { | |
24 | |
25 // Singleton utility class for mime types. | |
26 class MimeUtil { | |
27 public: | |
28 enum Codec { | |
29 INVALID_CODEC, | |
30 PCM, | |
31 MP3, | |
32 MPEG2_AAC_LC, | |
33 MPEG2_AAC_MAIN, | |
34 MPEG2_AAC_SSR, | |
35 MPEG4_AAC_LC, | |
36 MPEG4_AAC_SBR_v1, | |
37 MPEG4_AAC_SBR_PS_v2, | |
38 VORBIS, | |
39 OPUS, | |
40 H264_BASELINE, | |
41 H264_MAIN, | |
42 H264_HIGH, | |
43 VP8, | |
44 VP9, | |
45 THEORA | |
46 }; | |
47 | |
48 bool IsSupportedMediaMimeType(const std::string& mime_type) const; | |
49 | |
50 bool AreSupportedMediaCodecs(const std::vector<std::string>& codecs) const; | |
51 | |
52 void ParseCodecString(const std::string& codecs, | |
53 std::vector<std::string>* codecs_out, | |
54 bool strip); | |
55 | |
56 bool IsStrictMediaMimeType(const std::string& mime_type) const; | |
57 SupportsType IsSupportedStrictMediaMimeType( | |
58 const std::string& mime_type, | |
59 const std::vector<std::string>& codecs) const; | |
60 | |
61 void RemoveProprietaryMediaTypesAndCodecsForTests(); | |
62 | |
63 private: | |
64 friend struct base::DefaultLazyInstanceTraits<MimeUtil>; | |
65 | |
66 typedef base::hash_set<std::string> MimeMappings; | |
67 | |
68 typedef base::hash_set<int> CodecSet; | |
69 typedef std::map<std::string, CodecSet> StrictMappings; | |
70 struct CodecEntry { | |
71 CodecEntry() : codec(INVALID_CODEC), is_ambiguous(true) {} | |
72 CodecEntry(Codec c, bool ambiguous) : codec(c), is_ambiguous(ambiguous) {} | |
73 Codec codec; | |
74 bool is_ambiguous; | |
75 }; | |
76 typedef std::map<std::string, CodecEntry> StringToCodecMappings; | |
77 | |
78 MimeUtil(); | |
79 | |
80 // Returns IsSupported if all codec IDs in |codecs| are unambiguous | |
81 // and are supported by the platform. MayBeSupported is returned if | |
82 // at least one codec ID in |codecs| is ambiguous but all the codecs | |
83 // are supported by the platform. IsNotSupported is returned if at | |
84 // least one codec ID is not supported by the platform. | |
85 SupportsType AreSupportedCodecs( | |
86 const CodecSet& supported_codecs, | |
87 const std::vector<std::string>& codecs) const; | |
88 | |
89 // For faster lookup, keep hash sets. | |
90 void InitializeMimeTypeMaps(); | |
91 | |
92 // Converts a codec ID into an Codec enum value and indicates | |
93 // whether the conversion was ambiguous. | |
94 // Returns true if this method was able to map |codec_id| to a specific | |
95 // Codec enum value. |codec| and |is_ambiguous| are only valid if true | |
96 // is returned. Otherwise their value is undefined after the call. | |
97 // |is_ambiguous| is true if |codec_id| did not have enough information to | |
98 // unambiguously determine the proper Codec enum value. If |is_ambiguous| | |
99 // is true |codec| contains the best guess for the intended Codec enum value. | |
100 bool StringToCodec(const std::string& codec_id, | |
101 Codec* codec, | |
102 bool* is_ambiguous) const; | |
103 | |
104 // Returns true if |codec| is supported by the platform. | |
105 // Note: This method will return false if the platform supports proprietary | |
106 // codecs but |allow_proprietary_codecs_| is set to false. | |
107 bool IsCodecSupported(Codec codec) const; | |
108 | |
109 // Returns true if |codec| refers to a proprietary codec. | |
110 bool IsCodecProprietary(Codec codec) const; | |
111 | |
112 // Returns true and sets |*default_codec| if |mime_type| has a default codec | |
113 // associated with it. Returns false otherwise and the value of | |
114 // |*default_codec| is undefined. | |
115 bool GetDefaultCodecLowerCase(const std::string& mime_type_lower_case, | |
116 Codec* default_codec) const; | |
117 | |
118 // Returns true if |mime_type_lower_case| has a default codec associated with | |
119 // it and IsCodecSupported() returns true for that particular codec. | |
120 bool IsDefaultCodecSupportedLowerCase( | |
121 const std::string& mime_type_lower_case) const; | |
122 | |
123 MimeMappings media_map_; | |
124 | |
125 // A map of mime_types and hash map of the supported codecs for the mime_type. | |
126 StrictMappings strict_format_map_; | |
127 | |
128 // Keeps track of whether proprietary codec support should be | |
129 // advertised to callers. | |
130 bool allow_proprietary_codecs_; | |
131 | |
132 // Lookup table for string compare based string -> Codec mappings. | |
133 StringToCodecMappings string_to_codec_map_; | |
134 }; // class MimeUtil | |
135 | |
136 // This variable is Leaky because we need to access it from WorkerPool threads. | |
137 static base::LazyInstance<MimeUtil>::Leaky g_mime_util = | |
138 LAZY_INSTANCE_INITIALIZER; | |
139 | |
140 // A list of media types: http://en.wikipedia.org/wiki/Internet_media_type | |
141 // A comprehensive mime type list: http://plugindoc.mozdev.org/winmime.php | |
142 // This set of codecs is supported by all variations of Chromium. | |
143 static const char* const common_media_types[] = { | |
144 // Ogg. | |
145 "audio/ogg", | |
146 "application/ogg", | |
147 #if !defined(OS_ANDROID) // Android doesn't support Ogg Theora. | |
148 "video/ogg", | |
149 #endif | |
150 | |
151 // WebM. | |
152 "video/webm", | |
153 "audio/webm", | |
154 | |
155 // Wav. | |
156 "audio/wav", | |
157 "audio/x-wav", | |
158 | |
159 #if defined(OS_ANDROID) | |
160 // HLS. Supported by Android ICS and above. | |
161 "application/vnd.apple.mpegurl", | |
162 "application/x-mpegurl", | |
163 #endif | |
164 }; | |
165 | |
166 // List of proprietary types only supported by Google Chrome. | |
167 static const char* const proprietary_media_types[] = { | |
168 // MPEG-4. | |
169 "video/mp4", | |
170 "video/x-m4v", | |
171 "audio/mp4", | |
172 "audio/x-m4a", | |
173 | |
174 // MP3. | |
175 "audio/mp3", | |
176 "audio/x-mp3", | |
177 "audio/mpeg", | |
178 "audio/aac", | |
179 | |
180 #if defined(ENABLE_MPEG2TS_STREAM_PARSER) | |
181 // MPEG-2 TS. | |
182 "video/mp2t", | |
183 #endif | |
184 }; | |
185 | |
186 #if defined(OS_ANDROID) | |
187 static bool IsCodecSupportedOnAndroid(MimeUtil::Codec codec) { | |
188 switch (codec) { | |
189 case MimeUtil::INVALID_CODEC: | |
190 return false; | |
191 | |
192 case MimeUtil::PCM: | |
193 case MimeUtil::MP3: | |
194 case MimeUtil::MPEG4_AAC_LC: | |
195 case MimeUtil::MPEG4_AAC_SBR_v1: | |
196 case MimeUtil::MPEG4_AAC_SBR_PS_v2: | |
197 case MimeUtil::H264_BASELINE: | |
198 case MimeUtil::H264_MAIN: | |
199 case MimeUtil::H264_HIGH: | |
200 case MimeUtil::VP8: | |
201 case MimeUtil::VORBIS: | |
202 return true; | |
203 | |
204 case MimeUtil::MPEG2_AAC_LC: | |
205 case MimeUtil::MPEG2_AAC_MAIN: | |
206 case MimeUtil::MPEG2_AAC_SSR: | |
207 // MPEG-2 variants of AAC are not supported on Android. | |
208 return false; | |
209 | |
210 case MimeUtil::VP9: | |
211 // VP9 is supported only in KitKat+ (API Level 19). | |
212 return base::android::BuildInfo::GetInstance()->sdk_int() >= 19; | |
213 | |
214 case MimeUtil::OPUS: | |
215 // Opus is supported only in Lollipop+ (API Level 21). | |
216 return base::android::BuildInfo::GetInstance()->sdk_int() >= 21; | |
217 | |
218 case MimeUtil::THEORA: | |
219 return false; | |
220 } | |
221 | |
222 return false; | |
223 } | |
224 | |
225 static bool IsMimeTypeSupportedOnAndroid(const std::string& mimeType) { | |
226 // HLS codecs are supported in ICS and above (API level 14) | |
227 if ((!mimeType.compare("application/vnd.apple.mpegurl") || | |
228 !mimeType.compare("application/x-mpegurl")) && | |
229 base::android::BuildInfo::GetInstance()->sdk_int() < 14) { | |
230 return false; | |
231 } | |
232 return true; | |
233 } | |
234 #endif | |
235 | |
236 struct MediaFormatStrict { | |
237 const char* const mime_type; | |
238 const char* const codecs_list; | |
239 }; | |
240 | |
241 // Following is the list of RFC 6381 compliant codecs: | |
242 // mp4a.66 - MPEG-2 AAC MAIN | |
243 // mp4a.67 - MPEG-2 AAC LC | |
244 // mp4a.68 - MPEG-2 AAC SSR | |
245 // mp4a.69 - MPEG-2 extension to MPEG-1 | |
246 // mp4a.6B - MPEG-1 audio | |
247 // mp4a.40.2 - MPEG-4 AAC LC | |
248 // mp4a.40.02 - MPEG-4 AAC LC (leading 0 in aud-oti for compatibility) | |
249 // mp4a.40.5 - MPEG-4 HE-AAC v1 (AAC LC + SBR) | |
250 // mp4a.40.05 - MPEG-4 HE-AAC v1 (AAC LC + SBR) (leading 0 in aud-oti for | |
251 // compatibility) | |
252 // mp4a.40.29 - MPEG-4 HE-AAC v2 (AAC LC + SBR + PS) | |
253 // | |
254 // avc1.42E0xx - H.264 Baseline | |
255 // avc1.4D40xx - H.264 Main | |
256 // avc1.6400xx - H.264 High | |
257 static const char kMP4AudioCodecsExpression[] = | |
258 "mp4a.66,mp4a.67,mp4a.68,mp4a.69,mp4a.6B,mp4a.40.2,mp4a.40.02,mp4a.40.5," | |
259 "mp4a.40.05,mp4a.40.29"; | |
260 static const char kMP4VideoCodecsExpression[] = | |
261 // This is not a complete list of supported avc1 codecs. It is simply used | |
262 // to register support for the corresponding Codec enum. Instead of using | |
263 // strings in these three arrays, we should use the Codec enum values. | |
264 // This will avoid confusion and unnecessary parsing at runtime. | |
265 // kUnambiguousCodecStringMap/kAmbiguousCodecStringMap should be the only | |
266 // mapping from strings to codecs. See crbug.com/461009. | |
267 "avc1.42E00A,avc1.4D400A,avc1.64000A," | |
268 "mp4a.66,mp4a.67,mp4a.68,mp4a.69,mp4a.6B,mp4a.40.2,mp4a.40.02,mp4a.40.5," | |
269 "mp4a.40.05,mp4a.40.29"; | |
270 | |
271 // These containers are also included in | |
272 // common_media_types/proprietary_media_types. See crbug.com/461012. | |
273 static const MediaFormatStrict format_codec_mappings[] = { | |
274 {"video/webm", "opus,vorbis,vp8,vp8.0,vp9,vp9.0"}, | |
275 {"audio/webm", "opus,vorbis"}, | |
276 {"audio/wav", "1"}, | |
277 {"audio/x-wav", "1"}, | |
278 // Android does not support Opus in Ogg container. | |
279 #if defined(OS_ANDROID) | |
280 {"video/ogg", "theora,vorbis"}, | |
281 {"audio/ogg", "vorbis"}, | |
282 {"application/ogg", "theora,vorbis"}, | |
283 #else | |
284 {"video/ogg", "opus,theora,vorbis"}, | |
285 {"audio/ogg", "opus,vorbis"}, | |
286 {"application/ogg", "opus,theora,vorbis"}, | |
287 #endif | |
288 {"audio/mpeg", "mp3"}, | |
289 {"audio/mp3", ""}, | |
290 {"audio/x-mp3", ""}, | |
291 {"audio/mp4", kMP4AudioCodecsExpression}, | |
292 {"audio/x-m4a", kMP4AudioCodecsExpression}, | |
293 {"video/mp4", kMP4VideoCodecsExpression}, | |
294 {"video/x-m4v", kMP4VideoCodecsExpression}, | |
295 {"application/x-mpegurl", kMP4VideoCodecsExpression}, | |
296 {"application/vnd.apple.mpegurl", kMP4VideoCodecsExpression}}; | |
297 | |
298 struct CodecIDMappings { | |
299 const char* const codec_id; | |
300 MimeUtil::Codec codec; | |
301 }; | |
302 | |
303 // List of codec IDs that provide enough information to determine the | |
304 // codec and profile being requested. | |
305 // | |
306 // The "mp4a" strings come from RFC 6381. | |
307 static const CodecIDMappings kUnambiguousCodecStringMap[] = { | |
308 {"1", MimeUtil::PCM}, // We only allow this for WAV so it isn't ambiguous. | |
309 // avc1/avc3.XXXXXX may be unambiguous; handled by ParseH264CodecID(). | |
310 {"mp3", MimeUtil::MP3}, | |
311 {"mp4a.66", MimeUtil::MPEG2_AAC_MAIN}, | |
312 {"mp4a.67", MimeUtil::MPEG2_AAC_LC}, | |
313 {"mp4a.68", MimeUtil::MPEG2_AAC_SSR}, | |
314 {"mp4a.69", MimeUtil::MP3}, | |
315 {"mp4a.6B", MimeUtil::MP3}, | |
316 {"mp4a.40.2", MimeUtil::MPEG4_AAC_LC}, | |
317 {"mp4a.40.02", MimeUtil::MPEG4_AAC_LC}, | |
318 {"mp4a.40.5", MimeUtil::MPEG4_AAC_SBR_v1}, | |
319 {"mp4a.40.05", MimeUtil::MPEG4_AAC_SBR_v1}, | |
320 {"mp4a.40.29", MimeUtil::MPEG4_AAC_SBR_PS_v2}, | |
321 {"vorbis", MimeUtil::VORBIS}, | |
322 {"opus", MimeUtil::OPUS}, | |
323 {"vp8", MimeUtil::VP8}, | |
324 {"vp8.0", MimeUtil::VP8}, | |
325 {"vp9", MimeUtil::VP9}, | |
326 {"vp9.0", MimeUtil::VP9}, | |
327 {"theora", MimeUtil::THEORA}}; | |
328 | |
329 // List of codec IDs that are ambiguous and don't provide | |
330 // enough information to determine the codec and profile. | |
331 // The codec in these entries indicate the codec and profile | |
332 // we assume the user is trying to indicate. | |
333 static const CodecIDMappings kAmbiguousCodecStringMap[] = { | |
334 {"mp4a.40", MimeUtil::MPEG4_AAC_LC}, | |
335 {"avc1", MimeUtil::H264_BASELINE}, | |
336 {"avc3", MimeUtil::H264_BASELINE}, | |
337 // avc1/avc3.XXXXXX may be ambiguous; handled by ParseH264CodecID(). | |
338 }; | |
339 | |
340 MimeUtil::MimeUtil() : allow_proprietary_codecs_(false) { | |
341 InitializeMimeTypeMaps(); | |
342 } | |
343 | |
344 SupportsType MimeUtil::AreSupportedCodecs( | |
345 const CodecSet& supported_codecs, | |
346 const std::vector<std::string>& codecs) const { | |
347 DCHECK(!supported_codecs.empty()); | |
348 DCHECK(!codecs.empty()); | |
349 | |
350 SupportsType result = IsSupported; | |
351 for (size_t i = 0; i < codecs.size(); ++i) { | |
352 bool is_ambiguous = true; | |
353 Codec codec = INVALID_CODEC; | |
354 if (!StringToCodec(codecs[i], &codec, &is_ambiguous)) | |
355 return IsNotSupported; | |
356 | |
357 if (!IsCodecSupported(codec) || | |
358 supported_codecs.find(codec) == supported_codecs.end()) { | |
359 return IsNotSupported; | |
360 } | |
361 | |
362 if (is_ambiguous) | |
363 result = MayBeSupported; | |
364 } | |
365 | |
366 return result; | |
367 } | |
368 | |
369 void MimeUtil::InitializeMimeTypeMaps() { | |
370 // Initialize the supported media types. | |
371 for (size_t i = 0; i < arraysize(common_media_types); ++i) { | |
372 #if defined(OS_ANDROID) | |
373 if (!IsMimeTypeSupportedOnAndroid(common_media_types[i])) | |
374 continue; | |
375 #endif | |
376 media_map_.insert(common_media_types[i]); | |
377 } | |
378 #if defined(USE_PROPRIETARY_CODECS) | |
379 allow_proprietary_codecs_ = true; | |
380 for (size_t i = 0; i < arraysize(proprietary_media_types); ++i) | |
381 media_map_.insert(proprietary_media_types[i]); | |
382 #endif | |
383 | |
384 for (size_t i = 0; i < arraysize(kUnambiguousCodecStringMap); ++i) { | |
385 string_to_codec_map_[kUnambiguousCodecStringMap[i].codec_id] = | |
386 CodecEntry(kUnambiguousCodecStringMap[i].codec, false); | |
387 } | |
388 | |
389 for (size_t i = 0; i < arraysize(kAmbiguousCodecStringMap); ++i) { | |
390 string_to_codec_map_[kAmbiguousCodecStringMap[i].codec_id] = | |
391 CodecEntry(kAmbiguousCodecStringMap[i].codec, true); | |
392 } | |
393 | |
394 // Initialize the strict supported media types. | |
395 for (size_t i = 0; i < arraysize(format_codec_mappings); ++i) { | |
396 std::vector<std::string> mime_type_codecs; | |
397 ParseCodecString(format_codec_mappings[i].codecs_list, | |
398 &mime_type_codecs, | |
399 false); | |
400 | |
401 CodecSet codecs; | |
402 for (size_t j = 0; j < mime_type_codecs.size(); ++j) { | |
403 Codec codec = INVALID_CODEC; | |
404 bool is_ambiguous = true; | |
405 CHECK(StringToCodec(mime_type_codecs[j], &codec, &is_ambiguous)); | |
406 DCHECK(!is_ambiguous); | |
407 codecs.insert(codec); | |
408 } | |
409 | |
410 strict_format_map_[format_codec_mappings[i].mime_type] = codecs; | |
411 } | |
412 } | |
413 | |
414 bool MimeUtil::IsSupportedMediaMimeType(const std::string& mime_type) const { | |
415 return media_map_.find(base::StringToLowerASCII(mime_type)) != | |
416 media_map_.end(); | |
417 } | |
418 | |
419 bool MimeUtil::AreSupportedMediaCodecs( | |
420 const std::vector<std::string>& codecs) const { | |
421 for (size_t i = 0; i < codecs.size(); ++i) { | |
422 Codec codec = INVALID_CODEC; | |
423 bool is_ambiguous = true; | |
424 if (!StringToCodec(codecs[i], &codec, &is_ambiguous) || | |
425 !IsCodecSupported(codec)) { | |
426 return false; | |
427 } | |
428 } | |
429 return true; | |
430 } | |
431 | |
432 void MimeUtil::ParseCodecString(const std::string& codecs, | |
433 std::vector<std::string>* codecs_out, | |
434 bool strip) { | |
435 std::string no_quote_codecs; | |
436 base::TrimString(codecs, "\"", &no_quote_codecs); | |
437 base::SplitString(no_quote_codecs, ',', codecs_out); | |
438 | |
439 if (!strip) | |
440 return; | |
441 | |
442 // Strip everything past the first '.' | |
443 for (std::vector<std::string>::iterator it = codecs_out->begin(); | |
444 it != codecs_out->end(); | |
445 ++it) { | |
446 size_t found = it->find_first_of('.'); | |
447 if (found != std::string::npos) | |
448 it->resize(found); | |
449 } | |
450 } | |
451 | |
452 bool MimeUtil::IsStrictMediaMimeType(const std::string& mime_type) const { | |
453 return strict_format_map_.find(base::StringToLowerASCII(mime_type)) != | |
454 strict_format_map_.end(); | |
455 } | |
456 | |
457 SupportsType MimeUtil::IsSupportedStrictMediaMimeType( | |
458 const std::string& mime_type, | |
459 const std::vector<std::string>& codecs) const { | |
460 const std::string mime_type_lower_case = base::StringToLowerASCII(mime_type); | |
461 StrictMappings::const_iterator it_strict_map = | |
462 strict_format_map_.find(mime_type_lower_case); | |
463 if (it_strict_map == strict_format_map_.end()) | |
464 return codecs.empty() ? MayBeSupported : IsNotSupported; | |
465 | |
466 if (it_strict_map->second.empty()) { | |
467 // We get here if the mimetype does not expect a codecs parameter. | |
468 return (codecs.empty() && | |
469 IsDefaultCodecSupportedLowerCase(mime_type_lower_case)) | |
470 ? IsSupported | |
471 : IsNotSupported; | |
472 } | |
473 | |
474 if (codecs.empty()) { | |
475 // We get here if the mimetype expects to get a codecs parameter, | |
476 // but didn't get one. If |mime_type_lower_case| does not have a default | |
477 // codec the best we can do is say "maybe" because we don't have enough | |
478 // information. | |
479 Codec default_codec = INVALID_CODEC; | |
480 if (!GetDefaultCodecLowerCase(mime_type_lower_case, &default_codec)) | |
481 return MayBeSupported; | |
482 | |
483 return IsCodecSupported(default_codec) ? IsSupported : IsNotSupported; | |
484 } | |
485 | |
486 return AreSupportedCodecs(it_strict_map->second, codecs); | |
487 } | |
488 | |
489 void MimeUtil::RemoveProprietaryMediaTypesAndCodecsForTests() { | |
490 for (size_t i = 0; i < arraysize(proprietary_media_types); ++i) { | |
491 media_map_.erase(proprietary_media_types[i]); | |
492 } | |
493 allow_proprietary_codecs_ = false; | |
494 } | |
495 | |
496 // Returns true iff |profile_str| conforms to hex string "42y0", where y is one | |
497 // of [8..F]. Requiring constraint_set0_flag be set and profile_idc be 0x42 is | |
498 // taken from ISO-14496-10 7.3.2.1, 7.4.2.1, and Annex A.2.1. | |
499 // | |
500 // |profile_str| is the first four characters of the H.264 suffix string | |
501 // (ignoring the last 2 characters of the full 6 character suffix that are | |
502 // level_idc). From ISO-14496-10 7.3.2.1, it consists of: | |
503 // 8 bits: profile_idc: required to be 0x42 here. | |
504 // 1 bit: constraint_set0_flag : required to be true here. | |
505 // 1 bit: constraint_set1_flag : ignored here. | |
506 // 1 bit: constraint_set2_flag : ignored here. | |
507 // 1 bit: constraint_set3_flag : ignored here. | |
508 // 4 bits: reserved : required to be 0 here. | |
509 // | |
510 // The spec indicates other ways, not implemented here, that a |profile_str| | |
511 // can indicate a baseline conforming decoder is sufficient for decode in Annex | |
512 // A.2.1: "[profile_idc not necessarily 0x42] with constraint_set0_flag set and | |
513 // in which level_idc and constraint_set3_flag represent a level less than or | |
514 // equal to the specified level." | |
515 static bool IsValidH264BaselineProfile(const std::string& profile_str) { | |
516 uint32 constraint_set_bits; | |
517 if (profile_str.size() != 4 || | |
518 profile_str[0] != '4' || | |
519 profile_str[1] != '2' || | |
520 profile_str[3] != '0' || | |
521 !base::HexStringToUInt(base::StringPiece(profile_str.c_str() + 2, 1), | |
522 &constraint_set_bits)) { | |
523 return false; | |
524 } | |
525 | |
526 return constraint_set_bits >= 8; | |
527 } | |
528 | |
529 static bool IsValidH264Level(const std::string& level_str) { | |
530 uint32 level; | |
531 if (level_str.size() != 2 || !base::HexStringToUInt(level_str, &level)) | |
532 return false; | |
533 | |
534 // Valid levels taken from Table A-1 in ISO-14496-10. | |
535 // Essentially |level_str| is toHex(10 * level). | |
536 return ((level >= 10 && level <= 13) || | |
537 (level >= 20 && level <= 22) || | |
538 (level >= 30 && level <= 32) || | |
539 (level >= 40 && level <= 42) || | |
540 (level >= 50 && level <= 51)); | |
541 } | |
542 | |
543 // Handle parsing H.264 codec IDs as outlined in RFC 6381 and ISO-14496-10. | |
544 // avc1.42y0xx, y >= 8 - H.264 Baseline | |
545 // avc1.4D40xx - H.264 Main | |
546 // avc1.6400xx - H.264 High | |
547 // | |
548 // avc1.xxxxxx & avc3.xxxxxx are considered ambiguous forms that are trying to | |
549 // signal H.264 Baseline. For example, the idc_level, profile_idc and | |
550 // constraint_set3_flag pieces may explicitly require decoder to conform to | |
551 // baseline profile at the specified level (see Annex A and constraint_set0 in | |
552 // ISO-14496-10). | |
553 static bool ParseH264CodecID(const std::string& codec_id, | |
554 MimeUtil::Codec* codec, | |
555 bool* is_ambiguous) { | |
556 // Make sure we have avc1.xxxxxx or avc3.xxxxxx | |
557 if (codec_id.size() != 11 || | |
558 (!StartsWithASCII(codec_id, "avc1.", true) && | |
559 !StartsWithASCII(codec_id, "avc3.", true))) { | |
560 return false; | |
561 } | |
562 | |
563 std::string profile = StringToUpperASCII(codec_id.substr(5, 4)); | |
564 if (IsValidH264BaselineProfile(profile)) { | |
565 *codec = MimeUtil::H264_BASELINE; | |
566 } else if (profile == "4D40") { | |
567 *codec = MimeUtil::H264_MAIN; | |
568 } else if (profile == "6400") { | |
569 *codec = MimeUtil::H264_HIGH; | |
570 } else { | |
571 *codec = MimeUtil::H264_BASELINE; | |
572 *is_ambiguous = true; | |
573 return true; | |
574 } | |
575 | |
576 *is_ambiguous = !IsValidH264Level(StringToUpperASCII(codec_id.substr(9))); | |
577 return true; | |
578 } | |
579 | |
580 bool MimeUtil::StringToCodec(const std::string& codec_id, | |
581 Codec* codec, | |
582 bool* is_ambiguous) const { | |
583 StringToCodecMappings::const_iterator itr = | |
584 string_to_codec_map_.find(codec_id); | |
585 if (itr != string_to_codec_map_.end()) { | |
586 *codec = itr->second.codec; | |
587 *is_ambiguous = itr->second.is_ambiguous; | |
588 return true; | |
589 } | |
590 | |
591 // If |codec_id| is not in |string_to_codec_map_|, then we assume that it is | |
592 // an H.264 codec ID because currently those are the only ones that can't be | |
593 // stored in the |string_to_codec_map_| and require parsing. | |
594 return ParseH264CodecID(codec_id, codec, is_ambiguous); | |
595 } | |
596 | |
597 bool MimeUtil::IsCodecSupported(Codec codec) const { | |
598 DCHECK_NE(codec, INVALID_CODEC); | |
599 | |
600 #if defined(OS_ANDROID) | |
601 if (!IsCodecSupportedOnAndroid(codec)) | |
602 return false; | |
603 #endif | |
604 | |
605 return allow_proprietary_codecs_ || !IsCodecProprietary(codec); | |
606 } | |
607 | |
608 bool MimeUtil::IsCodecProprietary(Codec codec) const { | |
609 switch (codec) { | |
610 case INVALID_CODEC: | |
611 case MP3: | |
612 case MPEG2_AAC_LC: | |
613 case MPEG2_AAC_MAIN: | |
614 case MPEG2_AAC_SSR: | |
615 case MPEG4_AAC_LC: | |
616 case MPEG4_AAC_SBR_v1: | |
617 case MPEG4_AAC_SBR_PS_v2: | |
618 case H264_BASELINE: | |
619 case H264_MAIN: | |
620 case H264_HIGH: | |
621 return true; | |
622 | |
623 case PCM: | |
624 case VORBIS: | |
625 case OPUS: | |
626 case VP8: | |
627 case VP9: | |
628 case THEORA: | |
629 return false; | |
630 } | |
631 | |
632 return true; | |
633 } | |
634 | |
635 bool MimeUtil::GetDefaultCodecLowerCase(const std::string& mime_type_lower_case, | |
636 Codec* default_codec) const { | |
637 if (mime_type_lower_case == "audio/mpeg" || | |
638 mime_type_lower_case == "audio/mp3" || | |
639 mime_type_lower_case == "audio/x-mp3") { | |
640 *default_codec = MimeUtil::MP3; | |
641 return true; | |
642 } | |
643 | |
644 return false; | |
645 } | |
646 | |
647 bool MimeUtil::IsDefaultCodecSupportedLowerCase( | |
648 const std::string& mime_type_lower_case) const { | |
649 Codec default_codec = Codec::INVALID_CODEC; | |
650 if (!GetDefaultCodecLowerCase(mime_type_lower_case, &default_codec)) | |
651 return false; | |
652 return IsCodecSupported(default_codec); | |
653 } | |
654 | |
Ryan Sleevi
2015/02/26 00:59:42
Everything above here should be in an unnamed name
| |
655 bool IsSupportedMediaMimeType(const std::string& mime_type) { | |
656 return g_mime_util.Get().IsSupportedMediaMimeType(mime_type); | |
657 } | |
658 | |
659 bool AreSupportedMediaCodecs(const std::vector<std::string>& codecs) { | |
660 return g_mime_util.Get().AreSupportedMediaCodecs(codecs); | |
661 } | |
662 | |
663 bool IsStrictMediaMimeType(const std::string& mime_type) { | |
664 return g_mime_util.Get().IsStrictMediaMimeType(mime_type); | |
665 } | |
666 | |
667 SupportsType IsSupportedStrictMediaMimeType( | |
668 const std::string& mime_type, | |
669 const std::vector<std::string>& codecs) { | |
670 return g_mime_util.Get().IsSupportedStrictMediaMimeType(mime_type, codecs); | |
671 } | |
672 | |
673 void ParseCodecString(const std::string& codecs, | |
674 std::vector<std::string>* codecs_out, | |
675 const bool strip) { | |
676 g_mime_util.Get().ParseCodecString(codecs, codecs_out, strip); | |
677 } | |
678 | |
679 void RemoveProprietaryMediaTypesAndCodecsForTests() { | |
680 g_mime_util.Get().RemoveProprietaryMediaTypesAndCodecsForTests(); | |
681 } | |
682 | |
683 } // namespace media | |
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