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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_ |
| 6 #define MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_ |
| 7 |
| 8 #include "base/callback.h" |
| 9 #include "base/macros.h" |
| 10 #include "media/audio/audio_io.h" |
| 11 #include "media/audio/audio_source_diverter.h" |
| 12 #include "media/base/audio_converter.h" |
| 13 #include "media/base/audio_shifter.h" |
| 14 |
| 15 namespace media { |
| 16 |
| 17 class VirtualAudioInputStream; |
| 18 |
| 19 // This class is an adapter between push model and pull model for audio stream. |
| 20 // Audio provider calls OnData() to push audio data into this class. |
| 21 // Audio consumer calls ProvideInput() to pull audio data. |
| 22 class MEDIA_EXPORT VirtualAudioSink : public AudioPushSink, |
| 23 public AudioConverter::InputCallback { |
| 24 public: |
| 25 typedef base::Callback<void(VirtualAudioSink* sink)> AfterCloseCallback; |
| 26 |
| 27 // Construct an audio loopback pathway to the given |target| (not owned). |
| 28 // |target| must outlive this instance. |
| 29 VirtualAudioSink(AudioParameters param, |
| 30 VirtualAudioInputStream* target, |
| 31 AfterCloseCallback callback); |
| 32 ~VirtualAudioSink() override; |
| 33 |
| 34 // AudioPushSink |
| 35 void Close() override; |
| 36 void OnData(const AudioBus& source, base::TimeTicks reference_time) override; |
| 37 |
| 38 // AudioConverter::InputCallback |
| 39 double ProvideInput(AudioBus* audio_bus, |
| 40 base::TimeDelta buffer_delay) override; |
| 41 |
| 42 private: |
| 43 const AudioParameters params_; |
| 44 VirtualAudioInputStream* const target_; |
| 45 AudioShifter shifter_; |
| 46 AfterCloseCallback after_close_callback_; |
| 47 }; |
| 48 |
| 49 } // namespace media |
| 50 |
| 51 #endif // MEDIA_AUDIO_VIRTUAL_AUDIO_SINK_H_ |
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