| // 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_VIRTUAL_AUDIO_INPUT_STREAM_H_ |
| #define MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_ |
| |
| #include <map> |
| #include <set> |
| |
| #include "base/gtest_prod_util.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "base/synchronization/lock.h" |
| #include "base/threading/thread_checker.h" |
| #include "media/audio/audio_io.h" |
| #include "media/audio/audio_parameters.h" |
| #include "media/audio/fake_audio_consumer.h" |
| #include "media/base/audio_converter.h" |
| |
| namespace base { |
| class SingleThreadTaskRunner; |
| } |
| |
| namespace media { |
| |
| class LoopbackAudioConverter; |
| class VirtualAudioOutputStream; |
| |
| // VirtualAudioInputStream converts and mixes audio from attached |
| // VirtualAudioOutputStreams into a single stream. It will continuously render |
| // audio until this VirtualAudioInputStream is stopped and closed. |
| class MEDIA_EXPORT VirtualAudioInputStream : public AudioInputStream { |
| public: |
| // Callback invoked just after VirtualAudioInputStream is closed. |
| typedef base::Callback<void(VirtualAudioInputStream* vais)> |
| AfterCloseCallback; |
| |
| // Construct a target for audio loopback which mixes multiple data streams |
| // into a single stream having the given |params|. |worker_task_runner| is |
| // the task runner on which AudioInputCallback methods are called and may or |
| // may not be the single thread that invokes the AudioInputStream methods. |
| VirtualAudioInputStream( |
| const AudioParameters& params, |
| const scoped_refptr<base::SingleThreadTaskRunner>& worker_task_runner, |
| const AfterCloseCallback& after_close_cb); |
| |
| virtual ~VirtualAudioInputStream(); |
| |
| // AudioInputStream: |
| virtual bool Open() OVERRIDE; |
| virtual void Start(AudioInputCallback* callback) OVERRIDE; |
| virtual void Stop() OVERRIDE; |
| virtual void Close() OVERRIDE; |
| virtual double GetMaxVolume() OVERRIDE; |
| virtual void SetVolume(double volume) OVERRIDE; |
| virtual double GetVolume() OVERRIDE; |
| virtual void SetAutomaticGainControl(bool enabled) OVERRIDE; |
| virtual bool GetAutomaticGainControl() OVERRIDE; |
| |
| // Attaches a VirtualAudioOutputStream to be used as input. This |
| // VirtualAudioInputStream must outlive all attached streams, so any attached |
| // stream must be closed (which causes a detach) before |
| // VirtualAudioInputStream is destroyed. |
| virtual void AddOutputStream(VirtualAudioOutputStream* stream, |
| const AudioParameters& output_params); |
| |
| // Detaches a VirtualAudioOutputStream and removes it as input. |
| virtual void RemoveOutputStream(VirtualAudioOutputStream* stream, |
| const AudioParameters& output_params); |
| |
| private: |
| friend class VirtualAudioInputStreamTest; |
| |
| typedef std::map<AudioParameters, LoopbackAudioConverter*> AudioConvertersMap; |
| |
| // Pulls audio data from all attached VirtualAudioOutputStreams, mixes and |
| // converts the streams into one, and pushes the result to |callback_|. |
| // Invoked on the worker thread. |
| void PumpAudio(AudioBus* audio_bus); |
| |
| const scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner_; |
| |
| AfterCloseCallback after_close_cb_; |
| |
| AudioInputCallback* callback_; |
| |
| // Non-const for testing. |
| scoped_ptr<uint8[]> buffer_; |
| AudioParameters params_; |
| |
| // Guards concurrent access to the converter network: converters_, mixer_, and |
| // num_attached_output_streams_. |
| base::Lock converter_network_lock_; |
| |
| // AudioConverters associated with the attached VirtualAudioOutputStreams, |
| // partitioned by common AudioParameters. |
| AudioConvertersMap converters_; |
| |
| // AudioConverter that takes all the audio converters and mixes them into one |
| // final audio stream. |
| AudioConverter mixer_; |
| |
| // Number of currently attached VirtualAudioOutputStreams. |
| int num_attached_output_streams_; |
| |
| // Handles callback timing for consumption of audio data. |
| FakeAudioConsumer fake_consumer_; |
| |
| base::ThreadChecker thread_checker_; |
| |
| DISALLOW_COPY_AND_ASSIGN(VirtualAudioInputStream); |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_VIRTUAL_AUDIO_INPUT_STREAM_H_ |