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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/sounds/audio_stream_handler.h"
#include <string>
#include "base/logging.h"
#include "base/message_loop/message_loop_proxy.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_manager_base.h"
#include "media/base/channel_layout.h"
namespace media {
namespace {
// Volume percent.
const double kOutputVolumePercent = 0.8;
// The number of frames each OnMoreData() call will request.
const int kDefaultFrameCount = 1024;
AudioStreamHandler::TestObserver* g_observer_for_testing = NULL;
AudioOutputStream::AudioSourceCallback* g_audio_source_for_testing = NULL;
} // namespace
class AudioStreamHandler::AudioStreamContainer
: public AudioOutputStream::AudioSourceCallback {
public:
AudioStreamContainer(const WavAudioHandler& wav_audio,
const AudioParameters& params)
: stream_(NULL),
wav_audio_(wav_audio),
params_(params),
cursor_(0) {
}
virtual ~AudioStreamContainer() {
DCHECK(AudioManager::Get()->GetMessageLoop()->BelongsToCurrentThread());
}
void Play() {
DCHECK(AudioManager::Get()->GetMessageLoop()->BelongsToCurrentThread());
if (!stream_) {
stream_ = AudioManager::Get()->MakeAudioOutputStreamProxy(params_,
std::string(),
std::string());
if (!stream_ || !stream_->Open()) {
LOG(ERROR) << "Failed to open an output stream.";
return;
}
stream_->SetVolume(kOutputVolumePercent);
} else {
// TODO (ygorshenin@): implement smart stream rewind.
stream_->Stop();
}
cursor_ = 0;
if (g_audio_source_for_testing)
stream_->Start(g_audio_source_for_testing);
else
stream_->Start(this);
if (g_observer_for_testing)
g_observer_for_testing->OnPlay();
}
void Stop() {
DCHECK(AudioManager::Get()->GetMessageLoop()->BelongsToCurrentThread());
if (!stream_)
return;
stream_->Stop();
stream_->Close();
stream_ = NULL;
if (g_observer_for_testing)
g_observer_for_testing->OnStop(cursor_);
}
private:
// AudioOutputStream::AudioSourceCallback overrides:
// Following methods could be called from *ANY* thread.
virtual int OnMoreData(AudioBus* dest,
AudioBuffersState /* state */) OVERRIDE {
size_t bytes_written = 0;
if (wav_audio_.AtEnd(cursor_) ||
!wav_audio_.CopyTo(dest, cursor_, &bytes_written)) {
AudioManager::Get()->GetMessageLoop()->PostTask(
FROM_HERE,
base::Bind(&AudioStreamContainer::Stop, base::Unretained(this)));
return 0;
}
cursor_ += bytes_written;
return dest->frames();
}
virtual int OnMoreIOData(AudioBus* /* source */,
AudioBus* dest,
AudioBuffersState state) OVERRIDE {
return OnMoreData(dest, state);
}
virtual void OnError(AudioOutputStream* /* stream */) OVERRIDE {
LOG(ERROR) << "Error during system sound reproduction.";
}
AudioOutputStream* stream_;
const WavAudioHandler wav_audio_;
const AudioParameters params_;
size_t cursor_;
DISALLOW_COPY_AND_ASSIGN(AudioStreamContainer);
};
AudioStreamHandler::AudioStreamHandler(const base::StringPiece& wav_data)
: wav_audio_(wav_data),
initialized_(false) {
AudioManager* manager = AudioManager::Get();
if (!manager) {
LOG(ERROR) << "Can't get access to audio manager.";
return;
}
AudioParameters params(AudioParameters::AUDIO_PCM_LOW_LATENCY,
GuessChannelLayout(wav_audio_.num_channels()),
wav_audio_.sample_rate(),
wav_audio_.bits_per_sample(),
kDefaultFrameCount);
if (!params.IsValid()) {
LOG(ERROR) << "Audio params are invalid.";
return;
}
stream_.reset(new AudioStreamContainer(wav_audio_, params));
initialized_ = true;
}
AudioStreamHandler::~AudioStreamHandler() {
DCHECK(CalledOnValidThread());
AudioManager::Get()->GetMessageLoop()->PostTask(
FROM_HERE,
base::Bind(&AudioStreamContainer::Stop, base::Unretained(stream_.get())));
AudioManager::Get()->GetMessageLoop()->DeleteSoon(FROM_HERE,
stream_.release());
}
bool AudioStreamHandler::IsInitialized() const {
DCHECK(CalledOnValidThread());
return initialized_;
}
bool AudioStreamHandler::Play() {
DCHECK(CalledOnValidThread());
if (!IsInitialized())
return false;
AudioManager::Get()->GetMessageLoop()->PostTask(
FROM_HERE,
base::Bind(base::IgnoreResult(&AudioStreamContainer::Play),
base::Unretained(stream_.get())));
return true;
}
void AudioStreamHandler::Stop() {
DCHECK(CalledOnValidThread());
AudioManager::Get()->GetMessageLoop()->PostTask(
FROM_HERE,
base::Bind(&AudioStreamContainer::Stop, base::Unretained(stream_.get())));
}
// static
void AudioStreamHandler::SetObserverForTesting(TestObserver* observer) {
g_observer_for_testing = observer;
}
// static
void AudioStreamHandler::SetAudioSourceForTesting(
AudioOutputStream::AudioSourceCallback* source) {
g_audio_source_for_testing = source;
}
} // namespace media
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