| // 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 "base/thread_annotations.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_ GUARDED_BY(shifter_lock_); |
| base::Lock shifter_lock_; |
| AfterCloseCallback after_close_callback_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VirtualAudioSink); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_ |