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// Copyright 2013 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/cras/audio_manager_cras.h"
#include "base/command_line.h"
#include "base/environment.h"
#include "base/logging.h"
#include "base/nix/xdg_util.h"
#include "base/stl_util.h"
#include "media/audio/audio_util.h"
#include "media/audio/cras/cras_input.h"
#include "media/audio/cras/cras_unified.h"
#include "media/base/channel_layout.h"
namespace media {
// Maximum number of output streams that can be open simultaneously.
static const int kMaxOutputStreams = 50;
// Default sample rate for input and output streams.
static const int kDefaultSampleRate = 48000;
const char AudioManagerCras::kLoopbackDeviceId[] = "loopback";
bool AudioManagerCras::HasAudioOutputDevices() {
return true;
}
bool AudioManagerCras::HasAudioInputDevices() {
return true;
}
AudioManagerCras::AudioManagerCras() {
SetMaxOutputStreamsAllowed(kMaxOutputStreams);
}
AudioManagerCras::~AudioManagerCras() {
Shutdown();
}
void AudioManagerCras::ShowAudioInputSettings() {
NOTIMPLEMENTED();
}
void AudioManagerCras::GetAudioInputDeviceNames(
media::AudioDeviceNames* device_names) {
DCHECK(device_names->empty());
GetCrasAudioInputDevices(device_names);
return;
}
AudioParameters AudioManagerCras::GetInputStreamParameters(
const std::string& device_id) {
static const int kDefaultInputBufferSize = 1024;
// TODO(hshi): Fine-tune audio parameters based on |device_id|. The optimal
// parameters for the loopback stream may differ from the default.
return AudioParameters(
AudioParameters::AUDIO_PCM_LOW_LATENCY, CHANNEL_LAYOUT_STEREO,
kDefaultSampleRate, 16, kDefaultInputBufferSize);
}
void AudioManagerCras::GetCrasAudioInputDevices(
media::AudioDeviceNames* device_names) {
// Cras will route audio from a proper physical device automatically.
device_names->push_back(
AudioDeviceName(AudioManagerBase::kDefaultDeviceName,
AudioManagerBase::kDefaultDeviceId));
}
AudioOutputStream* AudioManagerCras::MakeLinearOutputStream(
const AudioParameters& params) {
DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
return MakeOutputStream(params);
}
AudioOutputStream* AudioManagerCras::MakeLowLatencyOutputStream(
const AudioParameters& params, const std::string& input_device_id) {
DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
// TODO(dgreid): Open the correct input device for unified IO.
return MakeOutputStream(params);
}
AudioInputStream* AudioManagerCras::MakeLinearInputStream(
const AudioParameters& params, const std::string& device_id) {
DCHECK_EQ(AudioParameters::AUDIO_PCM_LINEAR, params.format());
return MakeInputStream(params, device_id);
}
AudioInputStream* AudioManagerCras::MakeLowLatencyInputStream(
const AudioParameters& params, const std::string& device_id) {
DCHECK_EQ(AudioParameters::AUDIO_PCM_LOW_LATENCY, params.format());
return MakeInputStream(params, device_id);
}
AudioParameters AudioManagerCras::GetPreferredOutputStreamParameters(
const AudioParameters& input_params) {
static const int kDefaultOutputBufferSize = 512;
ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
int sample_rate = kDefaultSampleRate;
int buffer_size = kDefaultOutputBufferSize;
int bits_per_sample = 16;
int input_channels = 0;
if (input_params.IsValid()) {
sample_rate = input_params.sample_rate();
bits_per_sample = input_params.bits_per_sample();
channel_layout = input_params.channel_layout();
input_channels = input_params.input_channels();
buffer_size = input_params.frames_per_buffer();
}
int user_buffer_size = GetUserBufferSize();
if (user_buffer_size)
buffer_size = user_buffer_size;
return AudioParameters(
AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, input_channels,
sample_rate, bits_per_sample, buffer_size);
}
AudioOutputStream* AudioManagerCras::MakeOutputStream(
const AudioParameters& params) {
return new CrasUnifiedStream(params, this);
}
AudioInputStream* AudioManagerCras::MakeInputStream(
const AudioParameters& params, const std::string& device_id) {
return new CrasInputStream(params, this, device_id);
}
} // namespace media
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