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// Copyright 2014 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_AUDIO_OUTPUT_STREAM_SINK_H_
#define MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
#include <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.h"
#include "base/thread_annotations.h"
#include "base/time/time.h"
#include "media/audio/audio_io.h"
#include "media/base/audio_renderer_sink.h"
#include "media/base/media_export.h"
namespace media {
// Wrapper which exposes the browser side audio interface (AudioOutputStream) as
// if it were a renderer side audio interface (AudioRendererSink). Note: This
// will not work for sandboxed renderers.
//
// TODO(dalecurtis): Delete this class once we have a proper mojo audio service;
// tracked by http://crbug.com/425368
class MEDIA_EXPORT AudioOutputStreamSink
: public RestartableAudioRendererSink,
public AudioOutputStream::AudioSourceCallback {
public:
AudioOutputStreamSink();
// RestartableAudioRendererSink implementation.
void Initialize(const AudioParameters& params,
RenderCallback* callback) override;
void Start() override;
void Stop() override;
void Pause() override;
void Play() override;
bool SetVolume(double volume) override;
OutputDeviceInfo GetOutputDeviceInfo() override;
void GetOutputDeviceInfoAsync(OutputDeviceInfoCB info_cb) override;
bool IsOptimizedForHardwareParameters() override;
bool CurrentThreadIsRenderingThread() override;
// AudioSourceCallback implementation.
int OnMoreData(base::TimeDelta delay,
base::TimeTicks delay_timestamp,
int prior_frames_skipped,
AudioBus* dest) override;
void OnError(ErrorType type) override;
void Flush() override;
private:
~AudioOutputStreamSink() override;
void ClearCallback();
// Helper methods for running AudioManager methods on the audio thread.
void DoStart(const AudioParameters& params);
void DoStop();
void DoPause();
void DoFlush();
void DoPlay();
void DoSetVolume(double volume);
bool initialized_;
bool started_;
// Parameters provided by Initialize().
AudioParameters params_;
RenderCallback* render_callback_;
// State latched for the audio thread.
// |active_render_callback_| allows Stop()/Pause() to synchronously prevent
// callbacks. Access is synchronized by |callback_lock_|.
// |active_params_| is set on the audio thread and therefore does not need
// synchronization.
AudioParameters active_params_;
RenderCallback* active_render_callback_ GUARDED_BY(callback_lock_);
// Lock to synchronize setting and clearing of |active_render_callback_|.
base::Lock callback_lock_;
// The task runner for the audio thread.
const scoped_refptr<base::SingleThreadTaskRunner> audio_task_runner_;
// The actual AudioOutputStream, must only be accessed on the audio thread.
AudioOutputStream* stream_;
DISALLOW_COPY_AND_ASSIGN(AudioOutputStreamSink);
};
} // namespace media
#endif // MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_
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