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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 <memory>
#include <string>
#include "base/macros.h"
#include "media/base/audio_renderer_sink.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class AudioBus;
class AudioHash;
class FakeAudioWorker;
class MEDIA_EXPORT NullAudioSink : public SwitchableAudioRendererSink {
public:
explicit NullAudioSink(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
// AudioRendererSink implementation.
void Initialize(const AudioParameters& params,
RenderCallback* callback) override;
void Start() override;
void Stop() override;
void Pause() override;
void Play() override;
void Flush() override;
bool SetVolume(double volume) override;
OutputDeviceInfo GetOutputDeviceInfo() override;
void GetOutputDeviceInfoAsync(OutputDeviceInfoCB info_cb) override;
bool IsOptimizedForHardwareParameters() override;
bool CurrentThreadIsRenderingThread() override;
void SwitchOutputDevice(const std::string& device_id,
OutputDeviceStatusCB callback) 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:
~NullAudioSink() override;
private:
// Task that periodically calls Render() to consume audio data.
void CallRender(base::TimeTicks ideal_time, base::TimeTicks now);
bool initialized_;
bool started_;
bool playing_;
RenderCallback* callback_;
// Controls whether or not a running hash is computed for audio frames.
std::unique_ptr<AudioHash> audio_hash_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
std::unique_ptr<FakeAudioWorker> fake_worker_;
base::TimeDelta fixed_data_delay_;
std::unique_ptr<AudioBus> audio_bus_;
DISALLOW_COPY_AND_ASSIGN(NullAudioSink);
};
} // namespace media
#endif // MEDIA_AUDIO_NULL_AUDIO_SINK_H_
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