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// Copyright (c) 2013 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 WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_
#define WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_
#include "base/synchronization/lock.h"
#include "media/base/audio_renderer_sink.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebAudioSourceProvider.h"
namespace WebKit {
class WebAudioSourceProviderClient;
}
namespace webkit_media {
// WebAudioSourceProviderImpl provides a bridge between classes:
// WebKit::WebAudioSourceProvider <---> media::AudioRendererSink
//
// WebAudioSourceProviderImpl wraps an existing audio sink that is used unless
// WebKit has set a client via setClient(). While a client is set WebKit will
// periodically call provideInput() to render a certain number of audio
// sample-frames using the sink's RenderCallback to get the data.
//
// THREAD SAFETY:
// It is assumed that the callers to setClient() and provideInput()
// implement appropriate locking for thread safety when making
// these calls. This happens in WebKit.
class WebAudioSourceProviderImpl
: public WebKit::WebAudioSourceProvider,
public media::AudioRendererSink {
public:
explicit WebAudioSourceProviderImpl(
const scoped_refptr<media::AudioRendererSink>& sink);
// WebKit::WebAudioSourceProvider implementation.
virtual void setClient(WebKit::WebAudioSourceProviderClient* client);
virtual void provideInput(const WebKit::WebVector<float*>& audio_data,
size_t number_of_frames);
// media::AudioRendererSink implementation.
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void Play() OVERRIDE;
virtual void Pause(bool flush) OVERRIDE;
virtual bool SetVolume(double volume) OVERRIDE;
virtual void Initialize(const media::AudioParameters& params,
RenderCallback* renderer) OVERRIDE;
protected:
virtual ~WebAudioSourceProviderImpl();
private:
// Set to true when Initialize() is called.
bool is_initialized_;
int channels_;
int sample_rate_;
// Tracks if |sink_| has been instructed to consume audio.
bool is_running_;
// Where audio comes from.
media::AudioRendererSink::RenderCallback* renderer_;
// When set via setClient() it overrides |sink_| for consuming audio.
WebKit::WebAudioSourceProviderClient* client_;
// Where audio ends up unless overridden by |client_|.
base::Lock sink_lock_;
scoped_refptr<media::AudioRendererSink> sink_;
DISALLOW_IMPLICIT_CONSTRUCTORS(WebAudioSourceProviderImpl);
};
} // namespace webkit_media
#endif // WEBKIT_MEDIA_WEBAUDIOSOURCEPROVIDER_IMPL_H_
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