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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/audio/audio_parameters.h"
#include "media/base/limits.h"
AudioParameters::AudioParameters()
: format_(AUDIO_PCM_LINEAR),
channel_layout_(CHANNEL_LAYOUT_NONE),
sample_rate_(0),
bits_per_sample_(0),
frames_per_buffer_(0),
channels_(0) {
}
AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
int sample_rate, int bits_per_sample,
int frames_per_buffer)
: format_(format),
channel_layout_(channel_layout),
sample_rate_(sample_rate),
bits_per_sample_(bits_per_sample),
frames_per_buffer_(frames_per_buffer),
channels_(ChannelLayoutToChannelCount(channel_layout)) {
}
void AudioParameters::Reset(Format format, ChannelLayout channel_layout,
int sample_rate, int bits_per_sample,
int frames_per_buffer) {
format_ = format;
channel_layout_ = channel_layout;
sample_rate_ = sample_rate;
bits_per_sample_ = bits_per_sample;
frames_per_buffer_ = frames_per_buffer;
channels_ = ChannelLayoutToChannelCount(channel_layout);
}
bool AudioParameters::IsValid() const {
return (format_ >= 0) && (format_ < AUDIO_LAST_FORMAT) &&
(channels_ > 0) && (channels_ <= media::limits::kMaxChannels) &&
(sample_rate_ > 0) &&
(sample_rate_ <= media::limits::kMaxSampleRate) &&
(bits_per_sample_ > 0) &&
(bits_per_sample_ <= media::limits::kMaxBitsPerSample) &&
(frames_per_buffer_ > 0) &&
(frames_per_buffer_ <= media::limits::kMaxSamplesPerPacket);
}
int AudioParameters::GetBytesPerBuffer() const {
return frames_per_buffer_ * GetBytesPerFrame();
}
int AudioParameters::GetBytesPerSecond() const {
return sample_rate_ * GetBytesPerFrame();
}
int AudioParameters::GetBytesPerFrame() const {
return channels_ * bits_per_sample_ / 8;
}
bool AudioParameters::Compare::operator()(
const AudioParameters& a,
const AudioParameters& b) const {
if (a.format_ < b.format_)
return true;
if (a.format_ > b.format_)
return false;
if (a.channels_ < b.channels_)
return true;
if (a.channels_ > b.channels_)
return false;
if (a.sample_rate_ < b.sample_rate_)
return true;
if (a.sample_rate_ > b.sample_rate_)
return false;
if (a.bits_per_sample_ < b.bits_per_sample_)
return true;
if (a.bits_per_sample_ > b.bits_per_sample_)
return false;
return a.frames_per_buffer_ < b.frames_per_buffer_;
}
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