media/audio/audio_parameters.cc

   1 // Copyright (c) 2011 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/audio/audio_parameters.h"
   6
   7 #include "media/base/limits.h"
   8
   9 AudioParameters::AudioParameters()
  10     : format(AUDIO_PCM_LINEAR),
  11       channel_layout(CHANNEL_LAYOUT_NONE),
  12       sample_rate(0),
  13       bits_per_sample(0),
  14       samples_per_packet(0),
  15       channels(0) {
  16 }
  17
  18 AudioParameters::AudioParameters(const media::AudioDecoderConfig& config)
  19     : format(AUDIO_PCM_LINEAR),
  20       channel_layout(config.channel_layout),
  21       sample_rate(config.sample_rate),
  22       bits_per_sample(config.bits_per_channel),
  23       samples_per_packet(0),
  24       channels(ChannelLayoutToChannelCount(config.channel_layout)) {
  25 }
  26
  27 AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
  28                                  int sample_rate, int bits_per_sample,
  29                                  int samples_per_packet)
  30     : format(format),
  31       channel_layout(channel_layout),
  32       sample_rate(sample_rate),
  33       bits_per_sample(bits_per_sample),
  34       samples_per_packet(samples_per_packet),
  35       channels(ChannelLayoutToChannelCount(channel_layout)) {
  36 }
  37
  38 bool AudioParameters::IsValid() const {
  39   return (format >= 0) && (format < AUDIO_LAST_FORMAT) &&
  40       (channels > 0) && (channels <= media::Limits::kMaxChannels) &&
  41       (sample_rate > 0) && (sample_rate <= media::Limits::kMaxSampleRate) &&
  42       (bits_per_sample > 0) &&
  43       (bits_per_sample <= media::Limits::kMaxBitsPerSample) &&
  44       (samples_per_packet > 0) &&
  45       (samples_per_packet <= media::Limits::kMaxSamplesPerPacket);
  46 }
  47
  48 int AudioParameters::GetPacketSize() const {
  49   return samples_per_packet * channels * bits_per_sample / 8;
  50 }
  51
  52 int AudioParameters::GetBytesPerSecond() const {
  53   return sample_rate * channels * bits_per_sample / 8;
  54 }
  55
  56 bool AudioParameters::Compare::operator()(
  57     const AudioParameters& a,
  58     const AudioParameters& b) const {
  59   if (a.format < b.format)
  60     return true;
  61   if (a.format > b.format)
  62     return false;
  63   if (a.channels < b.channels)
  64     return true;
  65   if (a.channels > b.channels)
  66     return false;
  67   if (a.sample_rate < b.sample_rate)
  68     return true;
  69   if (a.sample_rate > b.sample_rate)
  70     return false;
  71   if (a.bits_per_sample < b.bits_per_sample)
  72     return true;
  73   if (a.bits_per_sample > b.bits_per_sample)
  74     return false;
  75   return a.samples_per_packet < b.samples_per_packet;
  76 }