Source/modules/webaudio/OfflineAudioDestinationNode.h

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1.  Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 */

#ifndef OfflineAudioDestinationNode_h
#define OfflineAudioDestinationNode_h

#include "modules/webaudio/AudioBuffer.h"
#include "modules/webaudio/AudioDestinationNode.h"
#include "public/platform/WebThread.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefPtr.h"

namespace WebCore {

class AudioBus;
class AudioContext;

class OfflineAudioDestinationNode : public AudioDestinationNode {
public:
    static PassRefPtr<OfflineAudioDestinationNode> create(AudioContext* context, AudioBuffer* renderTarget)
    {
        return adoptRef(new OfflineAudioDestinationNode(context, renderTarget));
    }

    virtual ~OfflineAudioDestinationNode();

    // AudioNode
    virtual void initialize() OVERRIDE;
    virtual void uninitialize() OVERRIDE;

    // AudioDestinationNode
    virtual void enableInput(const String&) OVERRIDE { }
    virtual void startRendering() OVERRIDE;

    virtual float sampleRate()  const { return m_renderTarget->sampleRate(); }

private:
    class OfflineRenderingTask;
    friend class OfflineRenderingTask;

    OfflineAudioDestinationNode(AudioContext*, AudioBuffer* renderTarget);

    // This AudioNode renders into this AudioBuffer.
    RefPtr<AudioBuffer> m_renderTarget;

    // Temporary AudioBus for each render quantum.
    RefPtr<AudioBus> m_renderBus;

    // Rendering thread.
    OwnPtr<WebKit::WebThread> m_renderThread;
    bool m_startedRendering;
    void offlineRender();

    // For completion callback on main thread.
    static void notifyCompleteDispatch(void* userData);
    void notifyComplete();
};

} // namespace WebCore

#endif // OfflineAudioDestinationNode_h