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(Format format, ChannelLayout channel_layout,
  19                                  int sample_rate, int bits_per_sample,
  20                                  int samples_per_packet)
  21     : format(format),
  22       channel_layout(channel_layout),
  23       sample_rate(sample_rate),
  24       bits_per_sample(bits_per_sample),
  25       samples_per_packet(samples_per_packet),
  26       channels(ChannelLayoutToChannelCount(channel_layout)) {
  27 }
  28
  29 bool AudioParameters::IsValid() const {
  30   return (format >= 0) && (format < AUDIO_LAST_FORMAT) &&
  31       (channels > 0) && (channels <= media::limits::kMaxChannels) &&
  32       (sample_rate > 0) && (sample_rate <= media::limits::kMaxSampleRate) &&
  33       (bits_per_sample > 0) &&
  34       (bits_per_sample <= media::limits::kMaxBitsPerSample) &&
  35       (samples_per_packet > 0) &&
  36       (samples_per_packet <= media::limits::kMaxSamplesPerPacket);
  37 }
  38
  39 int AudioParameters::GetPacketSize() const {
  40   return samples_per_packet * channels * bits_per_sample / 8;
  41 }
  42
  43 int AudioParameters::GetBytesPerSecond() const {
  44   return sample_rate * channels * bits_per_sample / 8;
  45 }
  46
  47 bool AudioParameters::Compare::operator()(
  48     const AudioParameters& a,
  49     const AudioParameters& b) const {
  50   if (a.format < b.format)
  51     return true;
  52   if (a.format > b.format)
  53     return false;
  54   if (a.channels < b.channels)
  55     return true;
  56   if (a.channels > b.channels)
  57     return false;
  58   if (a.sample_rate < b.sample_rate)
  59     return true;
  60   if (a.sample_rate > b.sample_rate)
  61     return false;
  62   if (a.bits_per_sample < b.bits_per_sample)
  63     return true;
  64   if (a.bits_per_sample > b.bits_per_sample)
  65     return false;
  66   return a.samples_per_packet < b.samples_per_packet;
  67 }