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// Copyright (c) 2011 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.h"
#include "base/bind.h"
#include "base/compiler_specific.h"
#include "base/message_loop.h"
#include "base/time.h"
#include "media/audio/audio_io.h"
AudioOutputDispatcher::AudioOutputDispatcher(
AudioManager* audio_manager, const AudioParameters& params,
int close_delay_ms)
: audio_manager_(audio_manager),
message_loop_(audio_manager->GetMessageLoop()),
params_(params),
pause_delay_milliseconds_(2 * params.samples_per_packet *
base::Time::kMillisecondsPerSecond / params.sample_rate),
paused_proxies_(0),
ALLOW_THIS_IN_INITIALIZER_LIST(close_timer_(FROM_HERE,
base::TimeDelta::FromMilliseconds(close_delay_ms),
this, &AudioOutputDispatcher::ClosePendingStreams)) {
}
AudioOutputDispatcher::~AudioOutputDispatcher() {
}
bool AudioOutputDispatcher::StreamOpened() {
DCHECK_EQ(MessageLoop::current(), message_loop_);
paused_proxies_++;
// Ensure that there is at least one open stream.
if (idle_streams_.empty() && !CreateAndOpenStream()) {
return false;
}
close_timer_.Reset();
return true;
}
AudioOutputStream* AudioOutputDispatcher::StreamStarted() {
DCHECK_EQ(MessageLoop::current(), message_loop_);
if (idle_streams_.empty() && !CreateAndOpenStream()) {
return NULL;
}
AudioOutputStream* stream = idle_streams_.back();
idle_streams_.pop_back();
DCHECK_GT(paused_proxies_, 0u);
paused_proxies_--;
close_timer_.Reset();
// Schedule task to allocate streams for other proxies if we need to.
message_loop_->PostTask(FROM_HERE, base::Bind(
&AudioOutputDispatcher::OpenTask, this));
return stream;
}
void AudioOutputDispatcher::StreamStopped(AudioOutputStream* stream) {
DCHECK_EQ(MessageLoop::current(), message_loop_);
paused_proxies_++;
pausing_streams_.push_front(stream);
close_timer_.Reset();
// Don't recycle stream until two buffers worth of time has elapsed.
message_loop_->PostDelayedTask(
FROM_HERE,
base::Bind(&AudioOutputDispatcher::StopStreamTask, this),
pause_delay_milliseconds_);
}
void AudioOutputDispatcher::StopStreamTask() {
if (pausing_streams_.empty())
return;
AudioOutputStream* stream = pausing_streams_.back();
pausing_streams_.pop_back();
idle_streams_.push_back(stream);
}
void AudioOutputDispatcher::StreamClosed() {
DCHECK_EQ(MessageLoop::current(), message_loop_);
while (!pausing_streams_.empty()) {
idle_streams_.push_back(pausing_streams_.back());
pausing_streams_.pop_back();
}
DCHECK_GT(paused_proxies_, 0u);
paused_proxies_--;
while (idle_streams_.size() > paused_proxies_) {
idle_streams_.back()->Close();
idle_streams_.pop_back();
}
}
MessageLoop* AudioOutputDispatcher::message_loop() {
return message_loop_;
}
bool AudioOutputDispatcher::CreateAndOpenStream() {
AudioOutputStream* stream =
audio_manager_->MakeAudioOutputStream(params_);
if (!stream) {
return false;
}
if (!stream->Open()) {
stream->Close();
return false;
}
idle_streams_.push_back(stream);
return true;
}
void AudioOutputDispatcher::OpenTask() {
// Make sure that we have at least one stream allocated if there
// are paused streams.
if (paused_proxies_ > 0 && idle_streams_.empty() &&
pausing_streams_.empty()) {
CreateAndOpenStream();
}
close_timer_.Reset();
}
// This method is called by |close_timer_|.
void AudioOutputDispatcher::ClosePendingStreams() {
while (!idle_streams_.empty()) {
idle_streams_.back()->Close();
idle_streams_.pop_back();
}
}
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