Move webaudio to oilpan

Source/modules/webaudio/ScriptProcessorNode.h

 /*
  * Copyright (C) 2010, 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
@@ skipping 32 matching lines @@
 // This basic implementation supports no more than one input and output.
 // The "onaudioprocess" attribute is an event listener which will get called periodically with an AudioProcessingEvent which has
 // AudioBuffers for each input and output.
 
 class ScriptProcessorNode FINAL : public AudioNode {
 public:
     // bufferSize must be one of the following values: 256, 512, 1024, 2048, 4096, 8192, 16384.
     // This value controls how frequently the onaudioprocess event handler is called and how many sample-frames need to be processed each call.
     // Lower numbers for bufferSize will result in a lower (better) latency. Higher numbers will be necessary to avoid audio breakup and glitches.
     // The value chosen must carefully balance between latency and audio quality.
-    static PassRefPtr<ScriptProcessorNode> create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
+    static PassRefPtrWillBeRawPtr<ScriptProcessorNode> create(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
 
     virtual ~ScriptProcessorNode();
 
     // AudioNode
     virtual void process(size_t framesToProcess) OVERRIDE;
     virtual void initialize() OVERRIDE;
     virtual void uninitialize() OVERRIDE;
 
     size_t bufferSize() const { return m_bufferSize; }
 
     DEFINE_ATTRIBUTE_EVENT_LISTENER(audioprocess);
 
+#if ENABLE(OILPAN)
+    virtual void clearKeepAlive() OVERRIDE;
+#endif
+
+    void trace(Visitor*);
 
 private:
     virtual double tailTime() const OVERRIDE;
     virtual double latencyTime() const OVERRIDE;
 
     ScriptProcessorNode(AudioContext*, float sampleRate, size_t bufferSize, unsigned numberOfInputChannels, unsigned numberOfOutputChannels);
 
     static void fireProcessEventDispatch(void* userData);
     void fireProcessEvent();
 
     // Double buffering
     unsigned doubleBufferIndex() const { return m_doubleBufferIndex; }
     void swapBuffers() { m_doubleBufferIndex = 1 - m_doubleBufferIndex; }
     unsigned m_doubleBufferIndex;
     unsigned m_doubleBufferIndexForEvent;
-    Vector<RefPtr<AudioBuffer> > m_inputBuffers;
-    Vector<RefPtr<AudioBuffer> > m_outputBuffers;
+    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_inputBuffers;
+    WillBeHeapVector<RefPtrWillBeMember<AudioBuffer> > m_outputBuffers;
 
     size_t m_bufferSize;
     unsigned m_bufferReadWriteIndex;
 
     unsigned m_numberOfInputChannels;
     unsigned m_numberOfOutputChannels;
 
     RefPtr<AudioBus> m_internalInputBus;
 
     // Synchronize process() with fireProcessEvent().
     mutable Mutex m_processEventLock;
+
+#if ENABLE(OILPAN)
+    // AudioNodes are still reference counted but they are in the
+    // oilpan heap because the ScriptProcessorNode is an EventTarget.
+    // This self-persistent keeps the object from being deleted
+    // until the reference count reaches zero.
+    //
+    // It is safe to drop the self-persistent when the ref count
+    // of a ScriptProcessorNode reaches zero. At that point, the
+    // ScriptProcessor node is removed from the AudioContext and
+    // it cannot be reattached. Therefore, the reference count
+    // will not go above zero again.
+    OwnPtr<Persistent<AudioNode> > m_keepAlive;

[Mads Ager (chromium), 2014/04/03 08:39:33]

This has to be in AudioNode. When the ref count in AudioNode is larger than 0 it
should have this keep alive. When it is 0 the keep alive should be deallocated.
Once this is in AudioNode you can use the GC_PLUGIN_IGNORE to get the plugin to
allow it.

[keishi, 2014/04/08 02:33:40]

Done.

+#endif
 };
 
 } // namespace WebCore
 
 #endif // ScriptProcessorNode_h