blob: b7ea4870c23c2bf5f6b51c2bfbfaa5279c566ef1 [file] [log] [blame]
// 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 "base/logging.h"
#include "media/base/limits.h"
namespace media {
AudioParameters::AudioParameters()
: format_(AUDIO_PCM_LINEAR),
channel_layout_(CHANNEL_LAYOUT_NONE),
sample_rate_(0),
bits_per_sample_(0),
frames_per_buffer_(0),
channels_(0),
input_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)),
input_channels_(0) {
}
AudioParameters::AudioParameters(Format format, ChannelLayout channel_layout,
int input_channels,
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)),
input_channels_(input_channels) {
}
void AudioParameters::Reset(Format format, ChannelLayout channel_layout,
int channels, int input_channels,
int sample_rate, int bits_per_sample,
int frames_per_buffer) {
if (channel_layout != CHANNEL_LAYOUT_DISCRETE)
DCHECK_EQ(channels, ChannelLayoutToChannelCount(channel_layout));
format_ = format;
channel_layout_ = channel_layout;
channels_ = channels;
input_channels_ = input_channels;
sample_rate_ = sample_rate;
bits_per_sample_ = bits_per_sample;
frames_per_buffer_ = frames_per_buffer;
}
bool AudioParameters::IsValid() const {
return (format_ >= AUDIO_PCM_LINEAR) &&
(format_ < AUDIO_LAST_FORMAT) &&
(channels_ > 0) &&
(channels_ <= media::limits::kMaxChannels) &&
(channel_layout_ > CHANNEL_LAYOUT_UNSUPPORTED) &&
(channel_layout_ < CHANNEL_LAYOUT_MAX) &&
(input_channels_ >= 0) &&
(input_channels_ <= media::limits::kMaxChannels) &&
(sample_rate_ >= media::limits::kMinSampleRate) &&
(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;
}
base::TimeDelta AudioParameters::GetBufferDuration() const {
return base::TimeDelta::FromMicroseconds(
frames_per_buffer_ * base::Time::kMicrosecondsPerSecond /
static_cast<float>(sample_rate_));
}
void AudioParameters::SetDiscreteChannels(int channels) {
channel_layout_ = CHANNEL_LAYOUT_DISCRETE;
channels_ = channels;
}
} // namespace media