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// Copyright 2015 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 "components/audio_modem/audio_player_impl.h"
#include <algorithm>
#include <string>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/run_loop.h"
#include "components/audio_modem/public/audio_modem_types.h"
#include "content/public/browser/browser_thread.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_parameters.h"
#include "media/base/audio_bus.h"
namespace {
const int kDefaultFrameCount = 1024;
const double kOutputVolumePercent = 1.0f;
} // namespace
namespace audio_modem {
// Public methods.
AudioPlayerImpl::AudioPlayerImpl()
: is_playing_(false), stream_(nullptr), frame_index_(0) {
}
AudioPlayerImpl::~AudioPlayerImpl() {
}
void AudioPlayerImpl::Initialize() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioPlayerImpl::InitializeOnAudioThread,
base::Unretained(this)));
}
void AudioPlayerImpl::Play(
const scoped_refptr<media::AudioBusRefCounted>& samples) {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioPlayerImpl::PlayOnAudioThread,
base::Unretained(this),
samples));
}
void AudioPlayerImpl::Stop() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioPlayerImpl::StopOnAudioThread, base::Unretained(this)));
}
void AudioPlayerImpl::Finalize() {
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioPlayerImpl::FinalizeOnAudioThread,
base::Unretained(this)));
}
// Private methods.
void AudioPlayerImpl::InitializeOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
stream_ = output_stream_for_testing_
? output_stream_for_testing_.get()
: media::AudioManager::Get()->MakeAudioOutputStreamProxy(
media::AudioParameters(
media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
media::CHANNEL_LAYOUT_MONO,
kDefaultSampleRate,
kDefaultBitsPerSample,
kDefaultFrameCount),
std::string());
if (!stream_ || !stream_->Open()) {
LOG(ERROR) << "Failed to open an output stream.";
if (stream_) {
stream_->Close();
stream_ = nullptr;
}
return;
}
stream_->SetVolume(kOutputVolumePercent);
}
void AudioPlayerImpl::PlayOnAudioThread(
const scoped_refptr<media::AudioBusRefCounted>& samples) {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_ || is_playing_)
return;
{
base::AutoLock al(state_lock_);
samples_ = samples;
frame_index_ = 0;
}
VLOG(3) << "Starting playback.";
is_playing_ = true;
stream_->Start(this);
}
void AudioPlayerImpl::StopOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_ || !is_playing_)
return;
VLOG(3) << "Stopping playback.";
stream_->Stop();
is_playing_ = false;
}
void AudioPlayerImpl::StopAndCloseOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
if (!stream_)
return;
StopOnAudioThread();
stream_->Close();
stream_ = nullptr;
}
void AudioPlayerImpl::FinalizeOnAudioThread() {
DCHECK(media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread());
StopAndCloseOnAudioThread();
delete this;
}
int AudioPlayerImpl::OnMoreData(media::AudioBus* dest,
uint32 /* total_bytes_delay */) {
base::AutoLock al(state_lock_);
// Continuously play our samples till explicitly told to stop.
const int leftover_frames = samples_->frames() - frame_index_;
const int frames_to_copy = std::min(dest->frames(), leftover_frames);
samples_->CopyPartialFramesTo(frame_index_, frames_to_copy, 0, dest);
frame_index_ += frames_to_copy;
// If we didn't fill the destination audio bus, wrap around and fill the rest.
if (leftover_frames <= dest->frames()) {
samples_->CopyPartialFramesTo(
0, dest->frames() - frames_to_copy, frames_to_copy, dest);
frame_index_ = dest->frames() - frames_to_copy;
}
return dest->frames();
}
void AudioPlayerImpl::OnError(media::AudioOutputStream* /* stream */) {
LOG(ERROR) << "Error during system sound reproduction.";
media::AudioManager::Get()->GetTaskRunner()->PostTask(
FROM_HERE,
base::Bind(&AudioPlayerImpl::StopAndCloseOnAudioThread,
base::Unretained(this)));
}
void AudioPlayerImpl::FlushAudioLoopForTesting() {
if (media::AudioManager::Get()->GetTaskRunner()->BelongsToCurrentThread())
return;
// Queue task on the audio thread, when it is executed, that means we've
// successfully executed all the tasks before us.
base::RunLoop rl;
media::AudioManager::Get()->GetTaskRunner()->PostTaskAndReply(
FROM_HERE,
base::Bind(base::IgnoreResult(&AudioPlayerImpl::FlushAudioLoopForTesting),
base::Unretained(this)),
rl.QuitClosure());
rl.Run();
}
} // namespace audio_modem
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