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 }
  25
  26 AudioDecoderConfig::AudioDecoderConfig(AudioCodec codec,
  27                                        SampleFormat sample_format,
  28                                        ChannelLayout channel_layout,
  29                                        int samples_per_second,
  30                                        const uint8* extra_data,
  31                                        size_t extra_data_size,
  32                                        bool is_encrypted) {
  33   Initialize(codec, sample_format, channel_layout, samples_per_second,
  34              extra_data, extra_data_size, is_encrypted, true,
  35              base::TimeDelta(), base::TimeDelta());
  36 }
  37
  38 void AudioDecoderConfig::Initialize(AudioCodec codec,
  39                                     SampleFormat sample_format,
  40                                     ChannelLayout channel_layout,
  41                                     int samples_per_second,
  42                                     const uint8* extra_data,
  43                                     size_t extra_data_size,
  44                                     bool is_encrypted,
  45                                     bool record_stats,
  46                                     base::TimeDelta seek_preroll,
  47                                     base::TimeDelta codec_delay) {
  48   CHECK((extra_data_size != 0) == (extra_data != NULL));
  49
  50   if (record_stats) {
  51     UMA_HISTOGRAM_ENUMERATION("Media.AudioCodec", codec, kAudioCodecMax);
  52     UMA_HISTOGRAM_ENUMERATION("Media.AudioSampleFormat", sample_format,
  53                               kSampleFormatMax);
  54     UMA_HISTOGRAM_ENUMERATION("Media.AudioChannelLayout", channel_layout,
  55                               CHANNEL_LAYOUT_MAX);
  56     AudioSampleRate asr = media::AsAudioSampleRate(samples_per_second);
  57     if (asr != kUnexpectedAudioSampleRate) {
  58       UMA_HISTOGRAM_ENUMERATION("Media.AudioSamplesPerSecond", asr,
  59                                 kUnexpectedAudioSampleRate);
  60     } else {
  61       UMA_HISTOGRAM_COUNTS(
  62           "Media.AudioSamplesPerSecondUnexpected", samples_per_second);
  63     }
  64   }
  65
  66   codec_ = codec;
  67   channel_layout_ = channel_layout;
  68   samples_per_second_ = samples_per_second;
  69   sample_format_ = sample_format;
  70   bytes_per_channel_ = SampleFormatToBytesPerChannel(sample_format);
  71   extra_data_.assign(extra_data, extra_data + extra_data_size);
  72   is_encrypted_ = is_encrypted;
  73   seek_preroll_ = seek_preroll;
  74   codec_delay_ = codec_delay;
  75
  76   int channels = ChannelLayoutToChannelCount(channel_layout_);
  77   bytes_per_frame_ = channels * bytes_per_channel_;
  78 }
  79
  80 AudioDecoderConfig::~AudioDecoderConfig() {}
  81
  82 bool AudioDecoderConfig::IsValidConfig() const {
  83   return codec_ != kUnknownAudioCodec &&
  84          channel_layout_ != CHANNEL_LAYOUT_UNSUPPORTED &&
  85          bytes_per_channel_ > 0 &&
  86          bytes_per_channel_ <= limits::kMaxBytesPerSample &&
  87          samples_per_second_ > 0 &&
  88          samples_per_second_ <= limits::kMaxSampleRate &&
  89          sample_format_ != kUnknownSampleFormat &&
  90          seek_preroll_ >= base::TimeDelta() &&
  91          codec_delay_ >= base::TimeDelta();
  92 }
  93
  94 bool AudioDecoderConfig::Matches(const AudioDecoderConfig& config) const {
  95   return ((codec() == config.codec()) &&
  96           (bytes_per_channel() == config.bytes_per_channel()) &&
  97           (channel_layout() == config.channel_layout()) &&
  98           (samples_per_second() == config.samples_per_second()) &&
  99           (extra_data_size() == config.extra_data_size()) &&
 100           (!extra_data() || !memcmp(extra_data(), config.extra_data(),
 101                                     extra_data_size())) &&
 102           (is_encrypted() == config.is_encrypted()) &&
 103           (sample_format() == config.sample_format()) &&
 104           (seek_preroll() == config.seek_preroll()) &&
 105           (codec_delay() == config.codec_delay()));
 106 }
 107
 108 }  // namespace media