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      1 /*
      2  * Copyright (C) 2011, Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1.  Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2.  Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
     17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     19  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
     20  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     23  */
     24 
     25 #ifndef OfflineAudioDestinationNode_h
     26 #define OfflineAudioDestinationNode_h
     27 
     28 #include "modules/webaudio/AudioBuffer.h"
     29 #include "modules/webaudio/AudioDestinationNode.h"
     30 #include "wtf/PassRefPtr.h"
     31 #include "wtf/RefPtr.h"
     32 #include "wtf/Threading.h"
     33 
     34 namespace WebCore {
     35 
     36 class AudioBus;
     37 class AudioContext;
     38 
     39 class OfflineAudioDestinationNode : public AudioDestinationNode {
     40 public:
     41     static PassRefPtr<OfflineAudioDestinationNode> create(AudioContext* context, AudioBuffer* renderTarget)
     42     {
     43         return adoptRef(new OfflineAudioDestinationNode(context, renderTarget));
     44     }
     45 
     46     virtual ~OfflineAudioDestinationNode();
     47 
     48     // AudioNode
     49     virtual void initialize() OVERRIDE;
     50     virtual void uninitialize() OVERRIDE;
     51 
     52     // AudioDestinationNode
     53     virtual void enableInput(const String&) OVERRIDE { }
     54     virtual void startRendering() OVERRIDE;
     55 
     56     virtual float sampleRate()  const { return m_renderTarget->sampleRate(); }
     57 
     58 private:
     59     OfflineAudioDestinationNode(AudioContext*, AudioBuffer* renderTarget);
     60 
     61     // This AudioNode renders into this AudioBuffer.
     62     RefPtr<AudioBuffer> m_renderTarget;
     63 
     64     // Temporary AudioBus for each render quantum.
     65     RefPtr<AudioBus> m_renderBus;
     66 
     67     // Rendering thread.
     68     volatile ThreadIdentifier m_renderThread;
     69     bool m_startedRendering;
     70     static void offlineRenderEntry(void* threadData);
     71     void offlineRender();
     72 
     73     // For completion callback on main thread.
     74     static void notifyCompleteDispatch(void* userData);
     75     void notifyComplete();
     76 };
     77 
     78 } // namespace WebCore
     79 
     80 #endif // OfflineAudioDestinationNode_h
     81