| // Copyright 2019 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_ANDROID_AAUDIO_OUTPUT_H_ |
| #define MEDIA_AUDIO_ANDROID_AAUDIO_OUTPUT_H_ |
| |
| #include <aaudio/AAudio.h> |
| |
| #include "base/synchronization/lock.h" |
| #include "base/thread_annotations.h" |
| #include "base/threading/thread_checker.h" |
| #include "media/audio/android/muteable_audio_output_stream.h" |
| #include "media/base/audio_parameters.h" |
| |
| namespace media { |
| |
| class AAudioDestructionHelper; |
| class AudioManagerAndroid; |
| |
| class AAudioOutputStream : public MuteableAudioOutputStream { |
| public: |
| AAudioOutputStream(AudioManagerAndroid* manager, |
| const AudioParameters& params, |
| aaudio_usage_t usage); |
| |
| AAudioOutputStream(const AAudioOutputStream&) = delete; |
| AAudioOutputStream& operator=(const AAudioOutputStream&) = delete; |
| |
| ~AAudioOutputStream() override; |
| |
| // Implementation of MuteableAudioOutputStream. |
| bool Open() override; |
| void Close() override; |
| void Start(AudioSourceCallback* callback) override; |
| void Stop() override; |
| void Flush() override; |
| void SetVolume(double volume) override; |
| void GetVolume(double* volume) override; |
| void SetMute(bool muted) override; |
| |
| // Public callbacks. |
| aaudio_data_callback_result_t OnAudioDataRequested(void* audio_data, |
| int32_t num_frames); |
| void OnStreamError(aaudio_result_t error); |
| |
| private: |
| // Returns the amount of unplayed audio relative to |delay_timestamp|. See the |
| // definition for AudioOutputStream::AudioSourceCallback::OnMoreData() for |
| // more information on these terms. |
| base::TimeDelta GetDelay(base::TimeTicks delay_timestamp); |
| |
| THREAD_CHECKER(thread_checker_); |
| |
| AudioManagerAndroid* const audio_manager_; |
| const AudioParameters params_; |
| |
| aaudio_usage_t usage_; |
| aaudio_performance_mode_t performance_mode_; |
| |
| // Constant used for calculating latency. Amount of nanoseconds per frame. |
| const double ns_per_frame_; |
| |
| std::unique_ptr<AudioBus> audio_bus_; |
| |
| AAudioStream* aaudio_stream_ = nullptr; |
| |
| // Bound to the audio data callback. Outlives |this| in case the callbacks |
| // continue after |this| is destroyed. See crbug.com/1183255. |
| std::unique_ptr<AAudioDestructionHelper> destruction_helper_; |
| |
| // Lock protects all members below which may be read concurrently from the |
| // audio manager thread and the OS provided audio thread. |
| base::Lock lock_; |
| |
| AudioSourceCallback* callback_ GUARDED_BY(lock_) = nullptr; |
| bool muted_ GUARDED_BY(lock_) = false; |
| double volume_ GUARDED_BY(lock_) = 1.0; |
| bool device_changed_ GUARDED_BY(lock_) = false; |
| }; |
| |
| } // namespace media |
| |
| #endif // MEDIA_AUDIO_ANDROID_AAUDIO_OUTPUT_H_ |