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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 "base/compiler_specific.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/lock.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
: NON_EXPORTED_BASE(public AudioRendererSink),
public AudioOutputStream::AudioSourceCallback {
public:
AudioOutputStreamSink();
// AudioRendererSink 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;
// AudioSourceCallback implementation.
int OnMoreData(AudioBus* dest, uint32 total_bytes_delay) override;
void OnError(AudioOutputStream* stream) override;
private:
~AudioOutputStreamSink() override;
// Helper methods for running AudioManager methods on the audio thread.
void DoStart();
void DoStop();
void DoPause();
void DoPlay();
void DoSetVolume(double volume);
// Clears |active_render_callback_| under lock, synchronously stopping render
// callbacks from any thread. Must be called before Pause() and Stop()
// trampoline to their helper methods on the audio thread.
void ClearCallback();
// Parameters provided by Initialize(), cached for use on other threads.
AudioParameters params_;
// Since Initialize() is only called once for AudioRenderSinks, save the
// callback both here and under |active_render_callback_| which will be
// cleared during Pause() and Stop() to achieve "synchronous" stoppage.
RenderCallback* render_callback_;
// 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_;
// Lock and callback for forwarding OnMoreData() calls into Render() calls.
base::Lock callback_lock_;
RenderCallback* active_render_callback_;
DISALLOW_COPY_AND_ASSIGN(AudioOutputStreamSink);
};
} // namepace media
#endif // MEDIA_AUDIO_AUDIO_OUTPUT_STREAM_SINK_H_