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// Copyright 2016 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_VIRTUAL_AUDIO_SINK_H_
#define MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "media/audio/audio_io.h"
#include "media/audio/audio_source_diverter.h"
#include "media/base/audio_converter.h"
#include "media/base/audio_shifter.h"
namespace media {
class VirtualAudioInputStream;
// This class is an adapter between push model and pull model for audio stream.
// This class is thread safe.
// Audio provider calls OnData() to push audio data into this class.
// Audio consumer calls ProvideInput() to pull audio data.
class MEDIA_EXPORT VirtualAudioSink : public AudioPushSink,
public AudioConverter::InputCallback {
public:
typedef base::Callback<void(VirtualAudioSink* sink)> AfterCloseCallback;
// Construct an audio loopback pathway to the given |target| (not owned).
// |target| must outlive this instance.
VirtualAudioSink(const AudioParameters& param,
VirtualAudioInputStream* target,
const AfterCloseCallback& callback);
~VirtualAudioSink() override;
// AudioPushSink
void Close() override;
void OnData(std::unique_ptr<AudioBus> source,
base::TimeTicks reference_time) override;
// AudioConverter::InputCallback
double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override;
private:
void StoreData(AudioBus* source, base::TimeTicks reference_time);
const AudioParameters params_;
VirtualAudioInputStream* const target_;
AudioShifter shifter_;
base::Lock shifter_lock_;
AfterCloseCallback after_close_callback_;
DISALLOW_COPY_AND_ASSIGN(VirtualAudioSink);
};
} // namespace media
#endif // MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_
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