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// 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 AudioManagerAndroid;
class AAudioOutputStream : public MuteableAudioOutputStream {
public:
AAudioOutputStream(AudioManagerAndroid* manager,
const AudioParameters& params,
aaudio_usage_t usage);
~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;
// 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;
DISALLOW_COPY_AND_ASSIGN(AAudioOutputStream);
};
} // namespace media
#endif // MEDIA_AUDIO_ANDROID_AAUDIO_OUTPUT_H_
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