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// Copyright 2012 The Chromium Authors
// 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/check_op.h"
#include "media/audio/audio_manager.h"
#include "media/audio/audio_output_dispatcher.h"
namespace media {
AudioOutputProxy::AudioOutputProxy(
base::WeakPtr<AudioOutputDispatcher> dispatcher)
: dispatcher_(std::move(dispatcher)), state_(kCreated), volume_(1.0) {
DCHECK(dispatcher_);
}
AudioOutputProxy::~AudioOutputProxy() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(state_ == kCreated || state_ == kClosed) << "State is: " << state_;
}
bool AudioOutputProxy::Open() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK_EQ(state_, kCreated);
if (!dispatcher_ || !dispatcher_->OpenStream()) {
state_ = kOpenError;
return false;
}
state_ = kOpened;
return true;
}
void AudioOutputProxy::Start(AudioSourceCallback* callback) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
// We need to support both states since the callback may not handle OnError()
// immediately (or at all). It's also possible for subsequent StartStream()
// calls to succeed after failing, so we allow it to be called again.
DCHECK(state_ == kOpened || state_ == kStartError);
if (!dispatcher_ || !dispatcher_->StartStream(callback, this)) {
state_ = kStartError;
callback->OnError(AudioSourceCallback::ErrorType::kUnknown);
return;
}
state_ = kPlaying;
}
void AudioOutputProxy::Stop() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
if (state_ != kPlaying)
return;
if (dispatcher_)
dispatcher_->StopStream(this);
state_ = kOpened;
}
void AudioOutputProxy::SetVolume(double volume) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
volume_ = volume;
if (dispatcher_)
dispatcher_->StreamVolumeSet(this, volume);
}
void AudioOutputProxy::GetVolume(double* volume) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
*volume = volume_;
}
void AudioOutputProxy::Close() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(state_ == kCreated || state_ == kOpenError || state_ == kOpened ||
state_ == kStartError);
// kStartError means OpenStream() succeeded and the stream must be closed
// before destruction.
if (state_ != kCreated && state_ != kOpenError && dispatcher_)
dispatcher_->CloseStream(this);
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;
}
void AudioOutputProxy::Flush() {
DCHECK(state_ != kPlaying);
if (dispatcher_)
dispatcher_->FlushStream(this);
}
} // namespace media
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