media/base/audio_decoder_config.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/base/audio_decoder_config.h"
   6
   7 #include "base/logging.h"
   8 #include "media/base/limits.h"
   9
  10 namespace media {
  11
  12 AudioDecoderConfig::AudioDecoderConfig()
  13     : codec_(kUnknownAudioCodec),
  14       sample_format_(kUnknownSampleFormat),
  15       bytes_per_channel_(0),
  16       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
  17       samples_per_second_(0),
  18       bytes_per_frame_(0),
  19       is_encrypted_(false),
  20       codec_delay_(0) {
  21 }
  22
  23 AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
  24                                        SampleFormat sample_format,
  25                                        ChannelLayout channel_layout,
  26                                        int samples_per_second,
  27                                        const uint8* extra_data,
  28                                        size_t extra_data_size,
  29                                        bool is_encrypted) {
  30   Initialize(codec, sample_format, channel_layout, samples_per_second,
  31              extra_data, extra_data_size, is_encrypted, base::TimeDelta(), 0);
  32 }
  33
  34 void AudioDecoderConfig::Initialize(AudioCodec codec,
  35                                     SampleFormat sample_format,
  36                                     ChannelLayout channel_layout,
  37                                     int samples_per_second,
  38                                     const uint8* extra_data,
  39                                     size_t extra_data_size,
  40                                     bool is_encrypted,
  41                                     base::TimeDelta seek_preroll,
  42                                     int codec_delay) {
  43   CHECK((extra_data_size != 0) == (extra_data != NULL));
  44
  45   codec_ = codec;
  46   channel_layout_ = channel_layout;
  47   samples_per_second_ = samples_per_second;
  48   sample_format_ = sample_format;
  49   bytes_per_channel_ = SampleFormatToBytesPerChannel(sample_format);
  50   extra_data_.assign(extra_data, extra_data + extra_data_size);
  51   is_encrypted_ = is_encrypted;
  52   seek_preroll_ = seek_preroll;
  53   codec_delay_ = codec_delay;
  54
  55   int channels = ChannelLayoutToChannelCount(channel_layout_);
  56   bytes_per_frame_ = channels * bytes_per_channel_;
  57 }
  58
  59 AudioDecoderConfig::~AudioDecoderConfig() {}
  60
  61 bool AudioDecoderConfig::IsValidConfig() const {
  62   return codec_ != kUnknownAudioCodec &&
  63          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
  64          bytes_per_channel_ > 0 &&
  65          bytes_per_channel_ <= limits::kMaxBytesPerSample &&
  66          samples_per_second_ > 0 &&
  67          samples_per_second_ <= limits::kMaxSampleRate &&
  68          sample_format_ != kUnknownSampleFormat &&
  69          seek_preroll_ >= base::TimeDelta() &&
  70          codec_delay_ >= 0;
  71 }
  72
  73 bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {
  74   return ((codec() == config.codec()) &&
  75           (bytes_per_channel() == config.bytes_per_channel()) &&
  76           (channel_layout() == config.channel_layout()) &&
  77           (samples_per_second() == config.samples_per_second()) &&
  78           (extra_data_size() == config.extra_data_size()) &&
  79           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
  80                                     extra_data_size())) &&
  81           (is_encrypted() == config.is_encrypted()) &&
  82           (sample_format() == config.sample_format()) &&
  83           (seek_preroll() == config.seek_preroll()) &&
  84           (codec_delay() == config.codec_delay()));
  85 }
  86
  87 std::string AudioDecoderConfig::AsHumanReadableString() const {
  88   std::ostringstream s;
  89   s << "codec: " << GetHumanReadableCodecName()
  90     << " bytes_per_channel: " << bytes_per_channel()
  91     << " channel_layout: " << channel_layout()
  92     << " samples_per_second: " << samples_per_second()
  93     << " sample_format: " << sample_format()
  94     << " bytes_per_frame: " << bytes_per_frame()
  95     << " seek_preroll: " << seek_preroll().InMilliseconds() << "ms"
  96     << " codec_delay: " << codec_delay()
  97     << " has extra data? " << (extra_data() ? "true" : "false")
  98     << " encrypted? " << (is_encrypted() ? "true" : "false");
  99   return s.str();
 100 }
 101
 102 // These names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
 103 std::string AudioDecoderConfig::GetHumanReadableCodecName() const {
 104   switch (codec()) {
 105     case kUnknownAudioCodec:
 106       return "unknown";
 107     case kCodecAAC:
 108       return "aac";
 109     case kCodecMP3:
 110       return "mp3";
 111     case kCodecPCM:
 112     case kCodecPCM_S16BE:
 113     case kCodecPCM_S24BE:
 114       return "pcm";
 115     case kCodecVorbis:
 116       return "vorbis";
 117     case kCodecFLAC:
 118       return "flac";
 119     case kCodecAMR_NB:
 120       return "amr_nb";
 121     case kCodecAMR_WB:
 122       return "amr_wb";
 123     case kCodecGSM_MS:
 124       return "gsm_ms";
 125     case kCodecPCM_ALAW:
 126       return "pcm_alaw";
 127     case kCodecPCM_MULAW:
 128       return "pcm_mulaw";
 129     case kCodecOpus:
 130       return "opus";
 131     case kCodecALAC:
 132       return "alac";
 133   }
 134   NOTREACHED();
 135   return "";
 136 }
 137
 138 }  // namespace media