media/audio/audio_parameters.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/audio/audio_parameters.h"
   6
   7 #include "media/base/limits.h"
   8
   9 namespace media {
  10
  11 AudioParameters::AudioParameters()
  12     : format_(AUDIO_PCM_LINEAR),
  13       channel_layout_(CHANNEL_LAYOUT_NONE),
  14       sample_rate_(0),
  15       bits_per_sample_(0),
  16       frames_per_buffer_(0),
  17       channels_(0) {
  18 }
  19
  20 AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
  21                                  int sample_rate, int bits_per_sample,
  22                                  int frames_per_buffer)
  23     : format_(format),
  24       channel_layout_(channel_layout),
  25       sample_rate_(sample_rate),
  26       bits_per_sample_(bits_per_sample),
  27       frames_per_buffer_(frames_per_buffer),
  28       channels_(ChannelLayoutToChannelCount(channel_layout)) {
  29 }
  30
  31 void AudioParameters::Reset(Format format, ChannelLayout channel_layout,
  32                             int sample_rate, int bits_per_sample,
  33                             int frames_per_buffer) {
  34   format_ = format;
  35   channel_layout_ = channel_layout;
  36   sample_rate_ = sample_rate;
  37   bits_per_sample_ = bits_per_sample;
  38   frames_per_buffer_ = frames_per_buffer;
  39   channels_ = ChannelLayoutToChannelCount(channel_layout);
  40 }
  41
  42 bool AudioParameters::IsValid() const {
  43   return (format_ >= AUDIO_PCM_LINEAR) &&
  44          (format_ < AUDIO_LAST_FORMAT) &&
  45          (channels_ > 0) &&
  46          (channels_ <= media::limits::kMaxChannels) &&
  47          (channel_layout_ > CHANNEL_LAYOUT_UNSUPPORTED) &&
  48          (channel_layout_ < CHANNEL_LAYOUT_MAX) &&
  49          (sample_rate_ >= media::limits::kMinSampleRate) &&
  50          (sample_rate_ <= media::limits::kMaxSampleRate) &&
  51          (bits_per_sample_ > 0) &&
  52          (bits_per_sample_ <= media::limits::kMaxBitsPerSample) &&
  53          (frames_per_buffer_ > 0) &&
  54          (frames_per_buffer_ <= media::limits::kMaxSamplesPerPacket);
  55 }
  56
  57 int AudioParameters::GetBytesPerBuffer() const {
  58   return frames_per_buffer_ * GetBytesPerFrame();
  59 }
  60
  61 int AudioParameters::GetBytesPerSecond() const {
  62   return sample_rate_ * GetBytesPerFrame();
  63 }
  64
  65 int AudioParameters::GetBytesPerFrame() const {
  66   return channels_ * bits_per_sample_ / 8;
  67 }
  68
  69 }  // namespace media