media/ffmpeg/ffmpeg_common.cc

   1 // Copyright (c) 2012 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 "media/ffmpeg/ffmpeg_common.h"
   6
   7 #include "base/basictypes.h"
   8 #include "base/logging.h"
   9 #include "base/metrics/histogram.h"
  10 #include "base/strings/string_number_conversions.h"
  11 #include "base/strings/string_split.h"
  12 #include "base/strings/string_util.h"
  13 #include "media/base/decoder_buffer.h"
  14 #include "media/base/video_util.h"
  15
  16 namespace media {
  17
  18 // Why FF_INPUT_BUFFER_PADDING_SIZE? FFmpeg assumes all input buffers are
  19 // padded. Check here to ensure FFmpeg only receives data padded to its
  20 // specifications.
  21 static_assert(DecoderBuffer::kPaddingSize >= FF_INPUT_BUFFER_PADDING_SIZE,
  22               "DecoderBuffer padding size does not fit ffmpeg requirement");
  23
  24 // Alignment requirement by FFmpeg for input and output buffers. This need to
  25 // be updated to match FFmpeg when it changes.
  26 #if defined(ARCH_CPU_ARM_FAMILY)
  27 static const int kFFmpegBufferAddressAlignment = 16;
  28 #else
  29 static const int kFFmpegBufferAddressAlignment = 32;
  30 #endif
  31
  32 // Check here to ensure FFmpeg only receives data aligned to its specifications.
  33 static_assert(
  34     DecoderBuffer::kAlignmentSize >= kFFmpegBufferAddressAlignment &&
  35     DecoderBuffer::kAlignmentSize % kFFmpegBufferAddressAlignment == 0,
  36     "DecoderBuffer alignment size does not fit ffmpeg requirement");
  37
  38 // Allows faster SIMD YUV convert. Also, FFmpeg overreads/-writes occasionally.
  39 // See video_get_buffer() in libavcodec/utils.c.
  40 static const int kFFmpegOutputBufferPaddingSize = 16;
  41
  42 static_assert(VideoFrame::kFrameSizePadding >= kFFmpegOutputBufferPaddingSize,
  43               "VideoFrame padding size does not fit ffmpeg requirement");
  44
  45 static_assert(
  46     VideoFrame::kFrameAddressAlignment >= kFFmpegBufferAddressAlignment &&
  47     VideoFrame::kFrameAddressAlignment % kFFmpegBufferAddressAlignment == 0,
  48     "VideoFrame frame address alignment does not fit ffmpeg requirement");
  49
  50 static const AVRational kMicrosBase = { 1, base::Time::kMicrosecondsPerSecond };
  51
  52 base::TimeDelta ConvertFromTimeBase(const AVRational& time_base,
  53                                     int64 timestamp) {
  54   int64 microseconds = av_rescale_q(timestamp, time_base, kMicrosBase);
  55   return base::TimeDelta::FromMicroseconds(microseconds);
  56 }
  57
  58 int64 ConvertToTimeBase(const AVRational& time_base,
  59                         const base::TimeDelta& timestamp) {
  60   return av_rescale_q(timestamp.InMicroseconds(), kMicrosBase, time_base);
  61 }
  62
  63 // Converts an FFmpeg audio codec ID into its corresponding supported codec id.
  64 static AudioCodec CodecIDToAudioCodec(AVCodecID codec_id) {
  65   switch (codec_id) {
  66     case AV_CODEC_ID_AAC:
  67       return kCodecAAC;
  68     case AV_CODEC_ID_MP3:
  69       return kCodecMP3;
  70     case AV_CODEC_ID_VORBIS:
  71       return kCodecVorbis;
  72     case AV_CODEC_ID_PCM_U8:
  73     case AV_CODEC_ID_PCM_S16LE:
  74     case AV_CODEC_ID_PCM_S24LE:
  75     case AV_CODEC_ID_PCM_F32LE:
  76       return kCodecPCM;
  77     case AV_CODEC_ID_PCM_S16BE:
  78       return kCodecPCM_S16BE;
  79     case AV_CODEC_ID_PCM_S24BE:
  80       return kCodecPCM_S24BE;
  81     case AV_CODEC_ID_FLAC:
  82       return kCodecFLAC;
  83     case AV_CODEC_ID_AMR_NB:
  84       return kCodecAMR_NB;
  85     case AV_CODEC_ID_AMR_WB:
  86       return kCodecAMR_WB;
  87     case AV_CODEC_ID_GSM_MS:
  88       return kCodecGSM_MS;
  89     case AV_CODEC_ID_PCM_ALAW:
  90       return kCodecPCM_ALAW;
  91     case AV_CODEC_ID_PCM_MULAW:
  92       return kCodecPCM_MULAW;
  93     case AV_CODEC_ID_OPUS:
  94       return kCodecOpus;
  95     case AV_CODEC_ID_ALAC:
  96       return kCodecALAC;
  97     default:
  98       DVLOG(1) << "Unknown audio CodecID: " << codec_id;
  99   }
 100   return kUnknownAudioCodec;
 101 }
 102
 103 static AVCodecID AudioCodecToCodecID(AudioCodec audio_codec,
 104                                      SampleFormat sample_format) {
 105   switch (audio_codec) {
 106     case kCodecAAC:
 107       return AV_CODEC_ID_AAC;
 108     case kCodecALAC:
 109       return AV_CODEC_ID_ALAC;
 110     case kCodecMP3:
 111       return AV_CODEC_ID_MP3;
 112     case kCodecPCM:
 113       switch (sample_format) {
 114         case kSampleFormatU8:
 115           return AV_CODEC_ID_PCM_U8;
 116         case kSampleFormatS16:
 117           return AV_CODEC_ID_PCM_S16LE;
 118         case kSampleFormatS32:
 119           return AV_CODEC_ID_PCM_S24LE;
 120         case kSampleFormatF32:
 121           return AV_CODEC_ID_PCM_F32LE;
 122         default:
 123           DVLOG(1) << "Unsupported sample format: " << sample_format;
 124       }
 125       break;
 126     case kCodecPCM_S16BE:
 127       return AV_CODEC_ID_PCM_S16BE;
 128     case kCodecPCM_S24BE:
 129       return AV_CODEC_ID_PCM_S24BE;
 130     case kCodecVorbis:
 131       return AV_CODEC_ID_VORBIS;
 132     case kCodecFLAC:
 133       return AV_CODEC_ID_FLAC;
 134     case kCodecAMR_NB:
 135       return AV_CODEC_ID_AMR_NB;
 136     case kCodecAMR_WB:
 137       return AV_CODEC_ID_AMR_WB;
 138     case kCodecGSM_MS:
 139       return AV_CODEC_ID_GSM_MS;
 140     case kCodecPCM_ALAW:
 141       return AV_CODEC_ID_PCM_ALAW;
 142     case kCodecPCM_MULAW:
 143       return AV_CODEC_ID_PCM_MULAW;
 144     case kCodecOpus:
 145       return AV_CODEC_ID_OPUS;
 146     default:
 147       DVLOG(1) << "Unknown AudioCodec: " << audio_codec;
 148   }
 149   return AV_CODEC_ID_NONE;
 150 }
 151
 152 // Converts an FFmpeg video codec ID into its corresponding supported codec id.
 153 static VideoCodec CodecIDToVideoCodec(AVCodecID codec_id) {
 154   switch (codec_id) {
 155     case AV_CODEC_ID_H264:
 156       return kCodecH264;
 157 #if defined(ENABLE_HEVC_DEMUXING)
 158     case AV_CODEC_ID_HEVC:
 159       return kCodecHEVC;
 160 #endif
 161     case AV_CODEC_ID_THEORA:
 162       return kCodecTheora;
 163     case AV_CODEC_ID_MPEG4:
 164       return kCodecMPEG4;
 165     case AV_CODEC_ID_VP8:
 166       return kCodecVP8;
 167     case AV_CODEC_ID_VP9:
 168       return kCodecVP9;
 169     default:
 170       DVLOG(1) << "Unknown video CodecID: " << codec_id;
 171   }
 172   return kUnknownVideoCodec;
 173 }
 174
 175 AVCodecID VideoCodecToCodecID(VideoCodec video_codec) {
 176   switch (video_codec) {
 177     case kCodecH264:
 178       return AV_CODEC_ID_H264;
 179 #if defined(ENABLE_HEVC_DEMUXING)
 180     case kCodecHEVC:
 181       return AV_CODEC_ID_HEVC;
 182 #endif
 183     case kCodecTheora:
 184       return AV_CODEC_ID_THEORA;
 185     case kCodecMPEG4:
 186       return AV_CODEC_ID_MPEG4;
 187     case kCodecVP8:
 188       return AV_CODEC_ID_VP8;
 189     case kCodecVP9:
 190       return AV_CODEC_ID_VP9;
 191     default:
 192       DVLOG(1) << "Unknown VideoCodec: " << video_codec;
 193   }
 194   return AV_CODEC_ID_NONE;
 195 }
 196
 197 static VideoCodecProfile ProfileIDToVideoCodecProfile(int profile) {
 198   // Clear out the CONSTRAINED & INTRA flags which are strict subsets of the
 199   // corresponding profiles with which they're used.
 200   profile &= ~FF_PROFILE_H264_CONSTRAINED;
 201   profile &= ~FF_PROFILE_H264_INTRA;
 202   switch (profile) {
 203     case FF_PROFILE_H264_BASELINE:
 204       return H264PROFILE_BASELINE;
 205     case FF_PROFILE_H264_MAIN:
 206       return H264PROFILE_MAIN;
 207     case FF_PROFILE_H264_EXTENDED:
 208       return H264PROFILE_EXTENDED;
 209     case FF_PROFILE_H264_HIGH:
 210       return H264PROFILE_HIGH;
 211     case FF_PROFILE_H264_HIGH_10:
 212       return H264PROFILE_HIGH10PROFILE;
 213     case FF_PROFILE_H264_HIGH_422:
 214       return H264PROFILE_HIGH422PROFILE;
 215     case FF_PROFILE_H264_HIGH_444_PREDICTIVE:
 216       return H264PROFILE_HIGH444PREDICTIVEPROFILE;
 217     default:
 218       DVLOG(1) << "Unknown profile id: " << profile;
 219   }
 220   return VIDEO_CODEC_PROFILE_UNKNOWN;
 221 }
 222
 223 static int VideoCodecProfileToProfileID(VideoCodecProfile profile) {
 224   switch (profile) {
 225     case H264PROFILE_BASELINE:
 226       return FF_PROFILE_H264_BASELINE;
 227     case H264PROFILE_MAIN:
 228       return FF_PROFILE_H264_MAIN;
 229     case H264PROFILE_EXTENDED:
 230       return FF_PROFILE_H264_EXTENDED;
 231     case H264PROFILE_HIGH:
 232       return FF_PROFILE_H264_HIGH;
 233     case H264PROFILE_HIGH10PROFILE:
 234       return FF_PROFILE_H264_HIGH_10;
 235     case H264PROFILE_HIGH422PROFILE:
 236       return FF_PROFILE_H264_HIGH_422;
 237     case H264PROFILE_HIGH444PREDICTIVEPROFILE:
 238       return FF_PROFILE_H264_HIGH_444_PREDICTIVE;
 239     default:
 240       DVLOG(1) << "Unknown VideoCodecProfile: " << profile;
 241   }
 242   return FF_PROFILE_UNKNOWN;
 243 }
 244
 245 SampleFormat AVSampleFormatToSampleFormat(AVSampleFormat sample_format) {
 246   switch (sample_format) {
 247     case AV_SAMPLE_FMT_U8:
 248       return kSampleFormatU8;
 249     case AV_SAMPLE_FMT_S16:
 250       return kSampleFormatS16;
 251     case AV_SAMPLE_FMT_S32:
 252       return kSampleFormatS32;
 253     case AV_SAMPLE_FMT_FLT:
 254       return kSampleFormatF32;
 255     case AV_SAMPLE_FMT_S16P:
 256       return kSampleFormatPlanarS16;
 257     case  AV_SAMPLE_FMT_S32P:
 258       return kSampleFormatPlanarS32;
 259     case AV_SAMPLE_FMT_FLTP:
 260       return kSampleFormatPlanarF32;
 261     default:
 262       DVLOG(1) << "Unknown AVSampleFormat: " << sample_format;
 263   }
 264   return kUnknownSampleFormat;
 265 }
 266
 267 static AVSampleFormat SampleFormatToAVSampleFormat(SampleFormat sample_format) {
 268   switch (sample_format) {
 269     case kSampleFormatU8:
 270       return AV_SAMPLE_FMT_U8;
 271     case kSampleFormatS16:
 272       return AV_SAMPLE_FMT_S16;
 273     case kSampleFormatS32:
 274       return AV_SAMPLE_FMT_S32;
 275     case kSampleFormatF32:
 276       return AV_SAMPLE_FMT_FLT;
 277     case kSampleFormatPlanarS16:
 278       return AV_SAMPLE_FMT_S16P;
 279     case kSampleFormatPlanarF32:
 280       return AV_SAMPLE_FMT_FLTP;
 281     default:
 282       DVLOG(1) << "Unknown SampleFormat: " << sample_format;
 283   }
 284   return AV_SAMPLE_FMT_NONE;
 285 }
 286
 287 void AVCodecContextToAudioDecoderConfig(const AVCodecContext* codec_context,
 288                                         bool is_encrypted,
 289                                         AudioDecoderConfig* config) {
 290   DCHECK_EQ(codec_context->codec_type, AVMEDIA_TYPE_AUDIO);
 291
 292   AudioCodec codec = CodecIDToAudioCodec(codec_context->codec_id);
 293
 294   SampleFormat sample_format =
 295       AVSampleFormatToSampleFormat(codec_context->sample_fmt);
 296
 297   ChannelLayout channel_layout = ChannelLayoutToChromeChannelLayout(
 298       codec_context->channel_layout, codec_context->channels);
 299
 300   int sample_rate = codec_context->sample_rate;
 301   if (codec == kCodecOpus) {
 302     // |codec_context->sample_fmt| is not set by FFmpeg because Opus decoding is
 303     // not enabled in FFmpeg.  It doesn't matter what value is set here, so long
 304     // as it's valid, the true sample format is selected inside the decoder.
 305     sample_format = kSampleFormatF32;
 306
 307     // Always use 48kHz for OPUS.  Technically we should match to the highest
 308     // supported hardware sample rate among [8, 12, 16, 24, 48] kHz, but we
 309     // don't know the hardware sample rate at this point and those rates are
 310     // rarely used for output.  See the "Input Sample Rate" section of the spec:
 311     // http://tools.ietf.org/html/draft-terriberry-oggopus-01#page-11
 312     sample_rate = 48000;
 313   }
 314
 315   base::TimeDelta seek_preroll;
 316   if (codec_context->seek_preroll > 0) {
 317     seek_preroll = base::TimeDelta::FromMicroseconds(
 318         codec_context->seek_preroll * 1000000.0 / codec_context->sample_rate);
 319   }
 320
 321   config->Initialize(codec,
 322                      sample_format,
 323                      channel_layout,
 324                      sample_rate,
 325                      codec_context->extradata,
 326                      codec_context->extradata_size,
 327                      is_encrypted,
 328                      seek_preroll,
 329                      codec_context->delay);
 330
 331   if (codec != kCodecOpus) {
 332     DCHECK_EQ(av_get_bytes_per_sample(codec_context->sample_fmt) * 8,
 333               config->bits_per_channel());
 334   }
 335 }
 336
 337 void AVStreamToAudioDecoderConfig(const AVStream* stream,
 338                                   AudioDecoderConfig* config) {
 339   bool is_encrypted = false;
 340   AVDictionaryEntry* key = av_dict_get(stream->metadata, "enc_key_id", NULL, 0);
 341   if (key)
 342     is_encrypted = true;
 343   AVCodecContextToAudioDecoderConfig(stream->codec, is_encrypted, config);
 344 }
 345
 346 void AudioDecoderConfigToAVCodecContext(const AudioDecoderConfig& config,
 347                                         AVCodecContext* codec_context) {
 348   codec_context->codec_type = AVMEDIA_TYPE_AUDIO;
 349   codec_context->codec_id = AudioCodecToCodecID(config.codec(),
 350                                                 config.sample_format());
 351   codec_context->sample_fmt = SampleFormatToAVSampleFormat(
 352       config.sample_format());
 353
 354   // TODO(scherkus): should we set |channel_layout|? I'm not sure if FFmpeg uses
 355   // said information to decode.
 356   codec_context->channels =
 357       ChannelLayoutToChannelCount(config.channel_layout());
 358   codec_context->sample_rate = config.samples_per_second();
 359
 360   if (config.extra_data()) {
 361     codec_context->extradata_size = config.extra_data_size();
 362     codec_context->extradata = reinterpret_cast<uint8_t*>(
 363         av_malloc(config.extra_data_size() + FF_INPUT_BUFFER_PADDING_SIZE));
 364     memcpy(codec_context->extradata, config.extra_data(),
 365            config.extra_data_size());
 366     memset(codec_context->extradata + config.extra_data_size(), '\0',
 367            FF_INPUT_BUFFER_PADDING_SIZE);
 368   } else {
 369     codec_context->extradata = NULL;
 370     codec_context->extradata_size = 0;
 371   }
 372 }
 373
 374 void AVStreamToVideoDecoderConfig(const AVStream* stream,
 375                                   VideoDecoderConfig* config) {
 376   gfx::Size coded_size(stream->codec->coded_width, stream->codec->coded_height);
 377
 378   // TODO(vrk): This assumes decoded frame data starts at (0, 0), which is true
 379   // for now, but may not always be true forever. Fix this in the future.
 380   gfx::Rect visible_rect(stream->codec->width, stream->codec->height);
 381
 382   AVRational aspect_ratio = { 1, 1 };
 383   if (stream->sample_aspect_ratio.num)
 384     aspect_ratio = stream->sample_aspect_ratio;
 385   else if (stream->codec->sample_aspect_ratio.num)
 386     aspect_ratio = stream->codec->sample_aspect_ratio;
 387
 388   VideoCodec codec = CodecIDToVideoCodec(stream->codec->codec_id);
 389
 390   VideoCodecProfile profile = VIDEO_CODEC_PROFILE_UNKNOWN;
 391   if (codec == kCodecVP8)
 392     profile = VP8PROFILE_ANY;
 393   else if (codec == kCodecVP9)
 394     profile = VP9PROFILE_ANY;
 395   else
 396     profile = ProfileIDToVideoCodecProfile(stream->codec->profile);
 397
 398   // Without the FFmpeg h264 decoder, AVFormat is unable to get the profile, so
 399   // default to baseline and let the VDA fail later if it doesn't support the
 400   // real profile. This is alright because if the FFmpeg h264 decoder isn't
 401   // enabled, there is no fallback if the VDA fails.
 402 #if defined(DISABLE_FFMPEG_VIDEO_DECODERS)
 403   if (codec == kCodecH264)
 404     profile = H264PROFILE_BASELINE;
 405 #endif
 406
 407   gfx::Size natural_size = GetNaturalSize(
 408       visible_rect.size(), aspect_ratio.num, aspect_ratio.den);
 409
 410   VideoPixelFormat format =
 411       AVPixelFormatToVideoPixelFormat(stream->codec->pix_fmt);
 412   // The format and coded size may be unknown if FFmpeg is compiled without
 413   // video decoders.
 414 #if defined(DISABLE_FFMPEG_VIDEO_DECODERS)
 415   if (format == PIXEL_FORMAT_UNKNOWN)
 416     format = PIXEL_FORMAT_YV12;
 417   if (coded_size == gfx::Size(0, 0))
 418     coded_size = visible_rect.size();
 419 #endif
 420
 421   if (codec == kCodecVP9) {
 422     // TODO(tomfinegan): libavcodec doesn't know about VP9.
 423     format = PIXEL_FORMAT_YV12;
 424     coded_size = visible_rect.size();
 425   }
 426
 427   // Pad out |coded_size| for subsampled YUV formats.
 428   if (format != PIXEL_FORMAT_YV24) {
 429     coded_size.set_width((coded_size.width() + 1) / 2 * 2);
 430     if (format != PIXEL_FORMAT_YV16)
 431       coded_size.set_height((coded_size.height() + 1) / 2 * 2);
 432   }
 433
 434   bool is_encrypted = false;
 435   AVDictionaryEntry* key = av_dict_get(stream->metadata, "enc_key_id", NULL, 0);
 436   if (key)
 437     is_encrypted = true;
 438
 439   AVDictionaryEntry* webm_alpha =
 440       av_dict_get(stream->metadata, "alpha_mode", NULL, 0);
 441   if (webm_alpha && !strcmp(webm_alpha->value, "1")) {
 442     format = PIXEL_FORMAT_YV12A;
 443   }
 444
 445   // Prefer the color space found by libavcodec if available.
 446   ColorSpace color_space = AVColorSpaceToColorSpace(stream->codec->colorspace,
 447                                                     stream->codec->color_range);
 448   if (color_space == COLOR_SPACE_UNSPECIFIED) {
 449     // Otherwise, assume that SD video is usually Rec.601, and HD is usually
 450     // Rec.709.
 451     color_space = (natural_size.height() < 720) ? COLOR_SPACE_SD_REC601
 452                                                 : COLOR_SPACE_HD_REC709;
 453   }
 454
 455   config->Initialize(codec, profile, format, color_space, coded_size,
 456                      visible_rect, natural_size, stream->codec->extradata,
 457                      stream->codec->extradata_size, is_encrypted);
 458 }
 459
 460 void VideoDecoderConfigToAVCodecContext(
 461     const VideoDecoderConfig& config,
 462     AVCodecContext* codec_context) {
 463   codec_context->codec_type = AVMEDIA_TYPE_VIDEO;
 464   codec_context->codec_id = VideoCodecToCodecID(config.codec());
 465   codec_context->profile = VideoCodecProfileToProfileID(config.profile());
 466   codec_context->coded_width = config.coded_size().width();
 467   codec_context->coded_height = config.coded_size().height();
 468   codec_context->pix_fmt = VideoPixelFormatToAVPixelFormat(config.format());
 469   if (config.color_space() == COLOR_SPACE_JPEG)
 470     codec_context->color_range = AVCOL_RANGE_JPEG;
 471
 472   if (config.extra_data()) {
 473     codec_context->extradata_size = config.extra_data_size();
 474     codec_context->extradata = reinterpret_cast<uint8_t*>(
 475         av_malloc(config.extra_data_size() + FF_INPUT_BUFFER_PADDING_SIZE));
 476     memcpy(codec_context->extradata, config.extra_data(),
 477            config.extra_data_size());
 478     memset(codec_context->extradata + config.extra_data_size(), '\0',
 479            FF_INPUT_BUFFER_PADDING_SIZE);
 480   } else {
 481     codec_context->extradata = NULL;
 482     codec_context->extradata_size = 0;
 483   }
 484 }
 485
 486 ChannelLayout ChannelLayoutToChromeChannelLayout(int64_t layout, int channels) {
 487   switch (layout) {
 488     case AV_CH_LAYOUT_MONO:
 489       return CHANNEL_LAYOUT_MONO;
 490     case AV_CH_LAYOUT_STEREO:
 491       return CHANNEL_LAYOUT_STEREO;
 492     case AV_CH_LAYOUT_2_1:
 493       return CHANNEL_LAYOUT_2_1;
 494     case AV_CH_LAYOUT_SURROUND:
 495       return CHANNEL_LAYOUT_SURROUND;
 496     case AV_CH_LAYOUT_4POINT0:
 497       return CHANNEL_LAYOUT_4_0;
 498     case AV_CH_LAYOUT_2_2:
 499       return CHANNEL_LAYOUT_2_2;
 500     case AV_CH_LAYOUT_QUAD:
 501       return CHANNEL_LAYOUT_QUAD;
 502     case AV_CH_LAYOUT_5POINT0:
 503       return CHANNEL_LAYOUT_5_0;
 504     case AV_CH_LAYOUT_5POINT1:
 505       return CHANNEL_LAYOUT_5_1;
 506     case AV_CH_LAYOUT_5POINT0_BACK:
 507       return CHANNEL_LAYOUT_5_0_BACK;
 508     case AV_CH_LAYOUT_5POINT1_BACK:
 509       return CHANNEL_LAYOUT_5_1_BACK;
 510     case AV_CH_LAYOUT_7POINT0:
 511       return CHANNEL_LAYOUT_7_0;
 512     case AV_CH_LAYOUT_7POINT1:
 513       return CHANNEL_LAYOUT_7_1;
 514     case AV_CH_LAYOUT_7POINT1_WIDE:
 515       return CHANNEL_LAYOUT_7_1_WIDE;
 516     case AV_CH_LAYOUT_STEREO_DOWNMIX:
 517       return CHANNEL_LAYOUT_STEREO_DOWNMIX;
 518     case AV_CH_LAYOUT_2POINT1:
 519       return CHANNEL_LAYOUT_2POINT1;
 520     case AV_CH_LAYOUT_3POINT1:
 521       return CHANNEL_LAYOUT_3_1;
 522     case AV_CH_LAYOUT_4POINT1:
 523       return CHANNEL_LAYOUT_4_1;
 524     case AV_CH_LAYOUT_6POINT0:
 525       return CHANNEL_LAYOUT_6_0;
 526     case AV_CH_LAYOUT_6POINT0_FRONT:
 527       return CHANNEL_LAYOUT_6_0_FRONT;
 528     case AV_CH_LAYOUT_HEXAGONAL:
 529       return CHANNEL_LAYOUT_HEXAGONAL;
 530     case AV_CH_LAYOUT_6POINT1:
 531       return CHANNEL_LAYOUT_6_1;
 532     case AV_CH_LAYOUT_6POINT1_BACK:
 533       return CHANNEL_LAYOUT_6_1_BACK;
 534     case AV_CH_LAYOUT_6POINT1_FRONT:
 535       return CHANNEL_LAYOUT_6_1_FRONT;
 536     case AV_CH_LAYOUT_7POINT0_FRONT:
 537       return CHANNEL_LAYOUT_7_0_FRONT;
 538 #ifdef AV_CH_LAYOUT_7POINT1_WIDE_BACK
 539     case AV_CH_LAYOUT_7POINT1_WIDE_BACK:
 540       return CHANNEL_LAYOUT_7_1_WIDE_BACK;
 541 #endif
 542     case AV_CH_LAYOUT_OCTAGONAL:
 543       return CHANNEL_LAYOUT_OCTAGONAL;
 544     default:
 545       // FFmpeg channel_layout is 0 for .wav and .mp3.  Attempt to guess layout
 546       // based on the channel count.
 547       return GuessChannelLayout(channels);
 548   }
 549 }
 550
 551 VideoPixelFormat AVPixelFormatToVideoPixelFormat(AVPixelFormat pixel_format) {
 552   // The YUVJ alternatives are FFmpeg's (deprecated, but still in use) way to
 553   // specify a pixel format and full range color combination.
 554   switch (pixel_format) {
 555     case AV_PIX_FMT_YUV422P:
 556     case AV_PIX_FMT_YUVJ422P:
 557       return PIXEL_FORMAT_YV16;
 558     case AV_PIX_FMT_YUV444P:
 559     case AV_PIX_FMT_YUVJ444P:
 560       return PIXEL_FORMAT_YV24;
 561     case AV_PIX_FMT_YUV420P:
 562     case AV_PIX_FMT_YUVJ420P:
 563       return PIXEL_FORMAT_YV12;
 564     case AV_PIX_FMT_YUVA420P:
 565       return PIXEL_FORMAT_YV12A;
 566     default:
 567       DVLOG(1) << "Unsupported AVPixelFormat: " << pixel_format;
 568   }
 569   return PIXEL_FORMAT_UNKNOWN;
 570 }
 571
 572 AVPixelFormat VideoPixelFormatToAVPixelFormat(VideoPixelFormat video_format) {
 573   switch (video_format) {
 574     case PIXEL_FORMAT_YV16:
 575       return AV_PIX_FMT_YUV422P;
 576     case PIXEL_FORMAT_YV12:
 577       return AV_PIX_FMT_YUV420P;
 578     case PIXEL_FORMAT_YV12A:
 579       return AV_PIX_FMT_YUVA420P;
 580     case PIXEL_FORMAT_YV24:
 581       return AV_PIX_FMT_YUV444P;
 582     default:
 583       DVLOG(1) << "Unsupported Format: " << video_format;
 584   }
 585   return AV_PIX_FMT_NONE;
 586 }
 587
 588 ColorSpace AVColorSpaceToColorSpace(AVColorSpace color_space,
 589                                     AVColorRange color_range) {
 590   if (color_range == AVCOL_RANGE_JPEG)
 591     return COLOR_SPACE_JPEG;
 592
 593   switch (color_space) {
 594     case AVCOL_SPC_UNSPECIFIED:
 595       break;
 596     case AVCOL_SPC_BT709:
 597       return COLOR_SPACE_HD_REC709;
 598     case AVCOL_SPC_SMPTE170M:
 599     case AVCOL_SPC_BT470BG:
 600       return COLOR_SPACE_SD_REC601;
 601     default:
 602       DVLOG(1) << "Unknown AVColorSpace: " << color_space;
 603   }
 604   return COLOR_SPACE_UNSPECIFIED;
 605 }
 606
 607 bool FFmpegUTCDateToTime(const char* date_utc, base::Time* out) {
 608   DCHECK(date_utc);
 609   DCHECK(out);
 610
 611   std::vector<base::StringPiece> fields = base::SplitStringPiece(
 612       date_utc, " ", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 613   if (fields.size() != 2)
 614     return false;
 615
 616   std::vector<base::StringPiece> date_fields = base::SplitStringPiece(
 617       fields[0], "-", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 618   if (date_fields.size() != 3)
 619     return false;
 620
 621   // TODO(acolwell): Update this parsing code when FFmpeg returns sub-second
 622   // information.
 623   std::vector<base::StringPiece> time_fields = base::SplitStringPiece(
 624       fields[1], ":", base::KEEP_WHITESPACE, base::SPLIT_WANT_NONEMPTY);
 625   if (time_fields.size() != 3)
 626     return false;
 627
 628   base::Time::Exploded exploded;
 629   exploded.millisecond = 0;
 630   if (base::StringToInt(date_fields[0], &exploded.year) &&
 631       base::StringToInt(date_fields[1], &exploded.month) &&
 632       base::StringToInt(date_fields[2], &exploded.day_of_month) &&
 633       base::StringToInt(time_fields[0], &exploded.hour) &&
 634       base::StringToInt(time_fields[1], &exploded.minute) &&
 635       base::StringToInt(time_fields[2], &exploded.second)) {
 636     base::Time parsed_time = base::Time::FromUTCExploded(exploded);
 637     if (parsed_time.is_null())
 638       return false;
 639
 640     *out = parsed_time;
 641     return true;
 642   }
 643
 644   return false;
 645 }
 646
 647 }  // namespace media