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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 <algorithm>
#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/cras/cras_input.h"
#include "media/audio/cras/cras_unified.h"
#include "media/base/channel_layout.h"
// cras_util.h headers pull in min/max macros...
// TODO(dgreid): Fix headers such that these aren't imported.
#undef min
#undef max
namespace media {
static void AddDefaultDevice(AudioDeviceNames* device_names) {
DCHECK(device_names->empty());
// Cras will route audio from a proper physical device automatically.
device_names->push_back(
AudioDeviceName(AudioManagerBase::kDefaultDeviceName,
AudioManagerBase::kDefaultDeviceId));
}
// 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;
// Define bounds for the output buffer size.
static const int kMinimumOutputBufferSize = 512;
static const int kMaximumOutputBufferSize = 8192;
// Default input buffer size.
static const int kDefaultInputBufferSize = 1024;
bool AudioManagerCras::HasAudioOutputDevices() {
return true;
}
bool AudioManagerCras::HasAudioInputDevices() {
return true;
}
AudioManagerCras::AudioManagerCras(AudioLogFactory* audio_log_factory)
: AudioManagerBase(audio_log_factory),
has_keyboard_mic_(false) {
SetMaxOutputStreamsAllowed(kMaxOutputStreams);
}
AudioManagerCras::~AudioManagerCras() {
Shutdown();
}
void AudioManagerCras::ShowAudioInputSettings() {
NOTIMPLEMENTED();
}
void AudioManagerCras::GetAudioInputDeviceNames(
AudioDeviceNames* device_names) {
AddDefaultDevice(device_names);
}
void AudioManagerCras::GetAudioOutputDeviceNames(
AudioDeviceNames* device_names) {
AddDefaultDevice(device_names);
}
AudioParameters AudioManagerCras::GetInputStreamParameters(
const std::string& device_id) {
DCHECK(GetTaskRunner()->BelongsToCurrentThread());
int user_buffer_size = GetUserBufferSize();
int buffer_size = user_buffer_size ?
user_buffer_size : kDefaultInputBufferSize;
AudioParameters::PlatformEffectsMask effects =
has_keyboard_mic_ ? AudioParameters::KEYBOARD_MIC
: AudioParameters::NO_EFFECTS;
// 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, buffer_size, effects);
}
void AudioManagerCras::SetHasKeyboardMic() {
DCHECK(GetTaskRunner()->BelongsToCurrentThread());
has_keyboard_mic_ = true;
}
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& device_id) {
DLOG_IF(ERROR, !device_id.empty()) << "Not implemented!";
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 std::string& output_device_id,
const AudioParameters& input_params) {
// TODO(tommi): Support |output_device_id|.
DLOG_IF(ERROR, !output_device_id.empty()) << "Not implemented!";
ChannelLayout channel_layout = CHANNEL_LAYOUT_STEREO;
int sample_rate = kDefaultSampleRate;
int buffer_size = kMinimumOutputBufferSize;
int bits_per_sample = 16;
if (input_params.IsValid()) {
sample_rate = input_params.sample_rate();
bits_per_sample = input_params.bits_per_sample();
channel_layout = input_params.channel_layout();
buffer_size =
std::min(kMaximumOutputBufferSize,
std::max(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,
sample_rate, bits_per_sample, buffer_size, AudioParameters::NO_EFFECTS);
}
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);
}
snd_pcm_format_t AudioManagerCras::BitsToFormat(int bits_per_sample) {
switch (bits_per_sample) {
case 8:
return SND_PCM_FORMAT_U8;
case 16:
return SND_PCM_FORMAT_S16;
case 24:
return SND_PCM_FORMAT_S24;
case 32:
return SND_PCM_FORMAT_S32;
default:
return SND_PCM_FORMAT_UNKNOWN;
}
}
} // namespace media
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