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 "base/metrics/histogram.h"
   9 #include "base/time/time.h"
  10 #include "media/audio/sample_rates.h"
  11 #include "media/base/limits.h"
  12 #include "media/base/sample_format.h"
  13
  14 namespace media {
  15
  16 AudioDecoderConfig::AudioDecoderConfig()
  17     : codec_(kUnknownAudioCodec),
  18       sample_format_(kUnknownSampleFormat),
  19       bytes_per_channel_(0),
  20       channel_layout_(CHANNEL_LAYOUT_UNSUPPORTED),
  21       samples_per_second_(0),
  22       bytes_per_frame_(0),
  23       is_encrypted_(false),
  24       codec_delay_(0) {
  25 }
  26
  27 AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
  28                                        SampleFormat sample_format,
  29                                        ChannelLayout channel_layout,
  30                                        int samples_per_second,
  31                                        const uint8* extra_data,
  32                                        size_t extra_data_size,
  33                                        bool is_encrypted) {
  34   Initialize(codec, sample_format, channel_layout, samples_per_second,
  35              extra_data, extra_data_size, is_encrypted, true,
  36              base::TimeDelta(), 0);
  37 }
  38
  39 void AudioDecoderConfig::Initialize(AudioCodec codec,
  40                                     SampleFormat sample_format,
  41                                     ChannelLayout channel_layout,
  42                                     int samples_per_second,
  43                                     const uint8* extra_data,
  44                                     size_t extra_data_size,
  45                                     bool is_encrypted,
  46                                     bool record_stats,
  47                                     base::TimeDelta seek_preroll,
  48                                     int codec_delay) {
  49   CHECK((extra_data_size != 0) == (extra_data != NULL));
  50
  51   if (record_stats) {
  52     UMA_HISTOGRAM_ENUMERATION("Media.AudioCodec", codec, kAudioCodecMax + 1);
  53     UMA_HISTOGRAM_ENUMERATION("Media.AudioSampleFormat", sample_format,
  54                               kSampleFormatMax + 1);
  55     UMA_HISTOGRAM_ENUMERATION("Media.AudioChannelLayout", channel_layout,
  56                               CHANNEL_LAYOUT_MAX + 1);
  57     AudioSampleRate asr;
  58     if (ToAudioSampleRate(samples_per_second, &asr)) {
  59       UMA_HISTOGRAM_ENUMERATION("Media.AudioSamplesPerSecond", asr,
  60                                 kAudioSampleRateMax + 1);
  61     } else {
  62       UMA_HISTOGRAM_COUNTS(
  63           "Media.AudioSamplesPerSecondUnexpected", samples_per_second);
  64     }
  65   }
  66
  67   codec_ = codec;
  68   channel_layout_ = channel_layout;
  69   samples_per_second_ = samples_per_second;
  70   sample_format_ = sample_format;
  71   bytes_per_channel_ = SampleFormatToBytesPerChannel(sample_format);
  72   extra_data_.assign(extra_data, extra_data + extra_data_size);
  73   is_encrypted_ = is_encrypted;
  74   seek_preroll_ = seek_preroll;
  75   codec_delay_ = codec_delay;
  76
  77   int channels = ChannelLayoutToChannelCount(channel_layout_);
  78   bytes_per_frame_ = channels * bytes_per_channel_;
  79 }
  80
  81 AudioDecoderConfig::~AudioDecoderConfig() {}
  82
  83 bool AudioDecoderConfig::IsValidConfig() const {
  84   return codec_ != kUnknownAudioCodec &&
  85          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
  86          bytes_per_channel_ > 0 &&
  87          bytes_per_channel_ <= limits::kMaxBytesPerSample &&
  88          samples_per_second_ > 0 &&
  89          samples_per_second_ <= limits::kMaxSampleRate &&
  90          sample_format_ != kUnknownSampleFormat &&
  91          seek_preroll_ >= base::TimeDelta() &&
  92          codec_delay_ >= 0;
  93 }
  94
  95 bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {
  96   return ((codec() == config.codec()) &&
  97           (bytes_per_channel() == config.bytes_per_channel()) &&
  98           (channel_layout() == config.channel_layout()) &&
  99           (samples_per_second() == config.samples_per_second()) &&
 100           (extra_data_size() == config.extra_data_size()) &&
 101           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
 102                                     extra_data_size())) &&
 103           (is_encrypted() == config.is_encrypted()) &&
 104           (sample_format() == config.sample_format()) &&
 105           (seek_preroll() == config.seek_preroll()) &&
 106           (codec_delay() == config.codec_delay()));
 107 }
 108
 109 std::string AudioDecoderConfig::AsHumanReadableString() const {
 110   std::ostringstream s;
 111   s << "codec: " << GetHumanReadableCodecName()
 112     << " bytes_per_channel: " << bytes_per_channel()
 113     << " channel_layout: " << channel_layout()
 114     << " samples_per_second: " << samples_per_second()
 115     << " sample_format: " << sample_format()
 116     << " bytes_per_frame: " << bytes_per_frame()
 117     << " seek_preroll: " << seek_preroll().InMilliseconds() << "ms"
 118     << " codec_delay: " << codec_delay()
 119     << " has extra data? " << (extra_data() ? "true" : "false")
 120     << " encrypted? " << (is_encrypted() ? "true" : "false");
 121   return s.str();
 122 }
 123
 124 // These names come from src/third_party/ffmpeg/libavcodec/codec_desc.c
 125 std::string AudioDecoderConfig::GetHumanReadableCodecName() const {
 126   switch (codec()) {
 127     case kUnknownAudioCodec:
 128       return "unknown";
 129     case kCodecAAC:
 130       return "aac";
 131     case kCodecMP3:
 132       return "mp3";
 133     case kCodecPCM:
 134     case kCodecPCM_S16BE:
 135     case kCodecPCM_S24BE:
 136       return "pcm";
 137     case kCodecVorbis:
 138       return "vorbis";
 139     case kCodecFLAC:
 140       return "flac";
 141     case kCodecAMR_NB:
 142       return "amr_nb";
 143     case kCodecAMR_WB:
 144       return "amr_wb";
 145     case kCodecGSM_MS:
 146       return "gsm_ms";
 147     case kCodecPCM_ALAW:
 148       return "pcm_alaw";
 149     case kCodecPCM_MULAW:
 150       return "pcm_mulaw";
 151     case kCodecOpus:
 152       return "opus";
 153     case kCodecALAC:
 154       return "alac";
 155   }
 156   NOTREACHED();
 157   return "";
 158 }
 159
 160 }  // namespace media