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// 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_output_dispatcher_impl.h"
#include <algorithm>
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "media/audio/audio_output_proxy.h"
namespace media {
AudioOutputDispatcherImpl::AudioOutputDispatcherImpl(
AudioManager* audio_manager,
const AudioParameters& params,
const std::string& output_device_id,
const base::TimeDelta& close_delay)
: AudioOutputDispatcher(audio_manager,
params,
output_device_id),
idle_proxies_(0),
close_timer_(FROM_HERE,
close_delay,
this,
&AudioOutputDispatcherImpl::CloseAllIdleStreams),
audio_log_(
audio_manager->CreateAudioLog(AudioLogFactory::AUDIO_OUTPUT_STREAM)),
audio_stream_id_(0) {}
AudioOutputDispatcherImpl::~AudioOutputDispatcherImpl() {
DCHECK_EQ(idle_proxies_, 0u);
DCHECK(proxy_to_physical_map_.empty());
DCHECK(idle_streams_.empty());
}
bool AudioOutputDispatcherImpl::OpenStream() {
DCHECK(task_runner_->BelongsToCurrentThread());
// Ensure that there is at least one open stream.
if (idle_streams_.empty() && !CreateAndOpenStream())
return false;
++idle_proxies_;
close_timer_.Reset();
return true;
}
bool AudioOutputDispatcherImpl::StartStream(
AudioOutputStream::AudioSourceCallback* callback,
AudioOutputProxy* stream_proxy) {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(proxy_to_physical_map_.find(stream_proxy) ==
proxy_to_physical_map_.end());
if (idle_streams_.empty() && !CreateAndOpenStream())
return false;
AudioOutputStream* physical_stream = idle_streams_.back();
idle_streams_.pop_back();
DCHECK_GT(idle_proxies_, 0u);
--idle_proxies_;
double volume = 0;
stream_proxy->GetVolume(&volume);
physical_stream->SetVolume(volume);
const int stream_id = audio_stream_ids_[physical_stream];
audio_log_->OnSetVolume(stream_id, volume);
physical_stream->Start(callback);
audio_log_->OnStarted(stream_id);
proxy_to_physical_map_[stream_proxy] = physical_stream;
close_timer_.Reset();
return true;
}
void AudioOutputDispatcherImpl::StopStream(AudioOutputProxy* stream_proxy) {
DCHECK(task_runner_->BelongsToCurrentThread());
AudioStreamMap::iterator it = proxy_to_physical_map_.find(stream_proxy);
DCHECK(it != proxy_to_physical_map_.end());
AudioOutputStream* physical_stream = it->second;
proxy_to_physical_map_.erase(it);
physical_stream->Stop();
audio_log_->OnStopped(audio_stream_ids_[physical_stream]);
++idle_proxies_;
idle_streams_.push_back(physical_stream);
close_timer_.Reset();
}
void AudioOutputDispatcherImpl::StreamVolumeSet(AudioOutputProxy* stream_proxy,
double volume) {
DCHECK(task_runner_->BelongsToCurrentThread());
AudioStreamMap::iterator it = proxy_to_physical_map_.find(stream_proxy);
if (it != proxy_to_physical_map_.end()) {
AudioOutputStream* physical_stream = it->second;
physical_stream->SetVolume(volume);
audio_log_->OnSetVolume(audio_stream_ids_[physical_stream], volume);
}
}
void AudioOutputDispatcherImpl::CloseStream(AudioOutputProxy* stream_proxy) {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK_GT(idle_proxies_, 0u);
--idle_proxies_;
// Leave at least a single stream running until the close timer fires to help
// cycle time when streams are opened and closed repeatedly.
CloseIdleStreams(std::max(idle_proxies_, static_cast<size_t>(1)));
close_timer_.Reset();
}
void AudioOutputDispatcherImpl::Shutdown() {
DCHECK(task_runner_->BelongsToCurrentThread());
// Close all idle streams immediately. The |close_timer_| will handle
// invalidating any outstanding tasks upon its destruction.
CloseAllIdleStreams();
// No AudioOutputProxy objects should hold a reference to us when we get
// to this stage.
DCHECK(HasOneRef()) << "Only the AudioManager should hold a reference";
}
bool AudioOutputDispatcherImpl::HasOutputProxies() const {
return idle_proxies_ || !proxy_to_physical_map_.empty();
}
bool AudioOutputDispatcherImpl::CreateAndOpenStream() {
DCHECK(task_runner_->BelongsToCurrentThread());
AudioOutputStream* stream = audio_manager_->MakeAudioOutputStream(
params_, device_id_);
if (!stream)
return false;
if (!stream->Open()) {
stream->Close();
return false;
}
const int stream_id = audio_stream_id_++;
audio_stream_ids_[stream] = stream_id;
audio_log_->OnCreated(
stream_id, params_, device_id_);
idle_streams_.push_back(stream);
return true;
}
void AudioOutputDispatcherImpl::CloseAllIdleStreams() {
DCHECK(task_runner_->BelongsToCurrentThread());
CloseIdleStreams(0);
}
void AudioOutputDispatcherImpl::CloseIdleStreams(size_t keep_alive) {
DCHECK(task_runner_->BelongsToCurrentThread());
if (idle_streams_.size() <= keep_alive)
return;
for (size_t i = keep_alive; i < idle_streams_.size(); ++i) {
AudioOutputStream* stream = idle_streams_[i];
stream->Close();
AudioStreamIDMap::iterator it = audio_stream_ids_.find(stream);
DCHECK(it != audio_stream_ids_.end());
audio_log_->OnClosed(it->second);
audio_stream_ids_.erase(it);
}
idle_streams_.erase(idle_streams_.begin() + keep_alive, idle_streams_.end());
}
} // namespace media
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