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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_proxy.h"
#include "base/logging.h"
#include "base/message_loop.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_output_dispatcher.h"
namespace media {
AudioOutputProxy::AudioOutputProxy(AudioOutputDispatcher* dispatcher)
: dispatcher_(dispatcher),
state_(kCreated),
physical_stream_(NULL),
volume_(1.0) {
}
AudioOutputProxy::~AudioOutputProxy() {
DCHECK(CalledOnValidThread());
DCHECK(state_ == kCreated || state_ == kClosed);
DCHECK(!physical_stream_);
}
bool AudioOutputProxy::Open() {
DCHECK(CalledOnValidThread());
DCHECK_EQ(state_, kCreated);
if (!dispatcher_->StreamOpened()) {
state_ = kError;
return false;
}
state_ = kOpened;
return true;
}
void AudioOutputProxy::Start(AudioSourceCallback* callback) {
DCHECK(CalledOnValidThread());
DCHECK(physical_stream_ == NULL);
DCHECK_EQ(state_, kOpened);
physical_stream_= dispatcher_->StreamStarted();
if (!physical_stream_) {
state_ = kError;
callback->OnError(this, 0);
return;
}
physical_stream_->SetVolume(volume_);
physical_stream_->Start(callback);
state_ = kPlaying;
}
void AudioOutputProxy::Stop() {
DCHECK(CalledOnValidThread());
if (state_ != kPlaying)
return;
DCHECK(physical_stream_);
physical_stream_->Stop();
dispatcher_->StreamStopped(physical_stream_);
physical_stream_ = NULL;
state_ = kOpened;
}
void AudioOutputProxy::SetVolume(double volume) {
DCHECK(CalledOnValidThread());
volume_ = volume;
if (physical_stream_) {
physical_stream_->SetVolume(volume);
}
}
void AudioOutputProxy::GetVolume(double* volume) {
DCHECK(CalledOnValidThread());
*volume = volume_;
}
void AudioOutputProxy::Close() {
DCHECK(CalledOnValidThread());
DCHECK(state_ == kCreated || state_ == kError || state_ == kOpened);
DCHECK(!physical_stream_);
if (state_ != kCreated)
dispatcher_->StreamClosed();
state_ = kClosed;
// Delete the object now like is done in the Close() implementation of
// physical stream objects. If we delete the object via DeleteSoon, we
// unnecessarily complicate the Shutdown procedure of the
// dispatcher+audio manager.
delete this;
}
} // namespace media
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