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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/null_audio_sink.h"
#include "base/bind.h"
#include "base/single_thread_task_runner.h"
#include "media/audio/fake_audio_worker.h"
#include "media/base/audio_hash.h"
namespace media {
NullAudioSink::NullAudioSink(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner)
: initialized_(false),
playing_(false),
callback_(NULL),
task_runner_(task_runner) {
}
NullAudioSink::~NullAudioSink() {}
void NullAudioSink::Initialize(const AudioParameters& params,
RenderCallback* callback) {
DCHECK(!initialized_);
fake_worker_.reset(new FakeAudioWorker(task_runner_, params));
audio_bus_ = AudioBus::Create(params);
callback_ = callback;
initialized_ = true;
}
void NullAudioSink::Start() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(!playing_);
}
void NullAudioSink::Stop() {
DCHECK(task_runner_->BelongsToCurrentThread());
// Stop may be called at any time, so we have to check before stopping.
if (fake_worker_)
fake_worker_->Stop();
}
void NullAudioSink::Play() {
DCHECK(task_runner_->BelongsToCurrentThread());
DCHECK(initialized_);
if (playing_)
return;
fake_worker_->Start(base::Bind(
&NullAudioSink::CallRender, base::Unretained(this)));
playing_ = true;
}
void NullAudioSink::Pause() {
DCHECK(task_runner_->BelongsToCurrentThread());
if (!playing_)
return;
fake_worker_->Stop();
playing_ = false;
}
bool NullAudioSink::SetVolume(double volume) {
// Audio is always muted.
return volume == 0.0;
}
void NullAudioSink::CallRender() {
DCHECK(task_runner_->BelongsToCurrentThread());
int frames_received = callback_->Render(audio_bus_.get(), 0);
if (!audio_hash_ || frames_received <= 0)
return;
audio_hash_->Update(audio_bus_.get(), frames_received);
}
void NullAudioSink::StartAudioHashForTesting() {
DCHECK(!initialized_);
audio_hash_.reset(new AudioHash());
}
std::string NullAudioSink::GetAudioHashForTesting() {
return audio_hash_ ? audio_hash_->ToString() : std::string();
}
} // namespace media
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