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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.
#ifndef MEDIA_AUDIO_NULL_AUDIO_SINK_H_
#define MEDIA_AUDIO_NULL_AUDIO_SINK_H_
#include <string>
#include "base/memory/scoped_ptr.h"
#include "media/base/audio_renderer_sink.h"
namespace base {
class MessageLoopProxy;
}
namespace media {
class AudioBus;
class AudioHash;
class FakeAudioConsumer;
class MEDIA_EXPORT NullAudioSink
: NON_EXPORTED_BASE(public AudioRendererSink) {
public:
NullAudioSink(const scoped_refptr<base::MessageLoopProxy>& message_loop);
// AudioRendererSink implementation.
virtual void Initialize(const AudioParameters& params,
RenderCallback* callback) OVERRIDE;
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Pause() OVERRIDE;
virtual void Play() OVERRIDE;
virtual bool SetVolume(double volume) OVERRIDE;
// Enables audio frame hashing. Must be called prior to Initialize().
void StartAudioHashForTesting();
// Returns the hash of all audio frames seen since construction.
std::string GetAudioHashForTesting();
protected:
virtual ~NullAudioSink();
private:
// Task that periodically calls Render() to consume audio data.
void CallRender(AudioBus* audio_bus);
bool initialized_;
bool playing_;
RenderCallback* callback_;
// Controls whether or not a running hash is computed for audio frames.
scoped_ptr<AudioHash> audio_hash_;
scoped_refptr<base::MessageLoopProxy> message_loop_;
scoped_ptr<FakeAudioConsumer> fake_consumer_;
DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
};
} // namespace media
#endif // MEDIA_AUDIO_NULL_AUDIO_SINK_H_
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