Made AudioNode an EventTarget

Source/modules/webaudio/AudioNode.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
  *    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
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AudioNode_h
 #define AudioNode_h
 
 #include "bindings/v8/ScriptWrappable.h"
+#include "core/dom/EventTarget.h"
 #include "core/platform/audio/AudioBus.h"
 #include "wtf/Forward.h"
 #include "wtf/OwnPtr.h"
 #include "wtf/PassOwnPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 
 #define DEBUG_AUDIONODE_REFERENCES 0
 
 namespace WebCore {
 
 class AudioContext;
 class AudioNodeInput;
 class AudioNodeOutput;
 class AudioParam;
 
 typedef int ExceptionCode;
 
 // An AudioNode is the basic building block for handling audio within an AudioContext.
 // It may be an audio source, an intermediate processing module, or an audio destination.
 // Each AudioNode can have inputs and/or outputs. An AudioSourceNode has no inputs and a single output.
 // An AudioDestinationNode has one input and no outputs and represents the final destination to the audio hardware.
 // Most processing nodes such as filters will have one input and one output, although multiple inputs and outputs are possible.
 
-class AudioNode : public ScriptWrappable {
+class AudioNode : public ScriptWrappable, public EventTarget {
 public:
     enum { ProcessingSizeInFrames = 128 };
 
     AudioNode(AudioContext*, float sampleRate);
     virtual ~AudioNode();
 
     AudioContext* context() { return m_context.get(); }
     const AudioContext* context() const { return m_context.get(); }
 
     enum NodeType {
@@ skipping 82 matching lines @@
 
 #if DEBUG_AUDIONODE_REFERENCES
     static void printNodeCounts();
 #endif
 
     bool isMarkedForDeletion() const { return m_isMarkedForDeletion; }
 
     // tailTime() is the length of time (not counting latency time) where non-zero output may occur after continuous silent input.
     virtual double tailTime() const = 0;
     // latencyTime() is the length of time it takes for non-zero output to appear after non-zero input is provided. This only applies to
-    // processing delay which is an artifact of the processing algorithm chosen and is *not* part of the intrinsic desired effect. For 
+    // processing delay which is an artifact of the processing algorithm chosen and is *not* part of the intrinsic desired effect. For
     // example, a "delay" effect is expected to delay the signal, and thus would not be considered latency.
     virtual double latencyTime() const = 0;
 
     // propagatesSilence() should return true if the node will generate silent output when given silent input. By default, AudioNode
     // will take tailTime() and latencyTime() into account when determining whether the node will propagate silence.
     virtual bool propagatesSilence() const;
     bool inputsAreSilent();
     void silenceOutputs();
     void unsilenceOutputs();
 
     void enableOutputsIfNecessary();
     void disableOutputsIfNecessary();
 
     void reportMemoryUsage(MemoryObjectInfo*) const;
 
     unsigned long channelCount();
     virtual void setChannelCount(unsigned long, ExceptionCode&);
 
     String channelCountMode();
     void setChannelCountMode(const String&, ExceptionCode&);
 
     String channelInterpretation();
     void setChannelInterpretation(const String&, ExceptionCode&);
 
     ChannelCountMode internalChannelCountMode() const { return m_channelCountMode; }
     AudioBus::ChannelInterpretation internalChannelInterpretation() const { return m_channelInterpretation; }
 
+    // EventTarget
+    virtual const AtomicString& interfaceName() const OVERRIDE;
+    virtual ScriptExecutionContext* scriptExecutionContext() const OVERRIDE;
+    virtual EventTargetData* eventTargetData() OVERRIDE { return &m_eventTargetData; }
+    virtual EventTargetData* ensureEventTargetData() OVERRIDE { return &m_eventTargetData; }
+
 protected:
     // Inputs and outputs must be created before the AudioNode is initialized.
     void addInput(PassOwnPtr<AudioNodeInput>);
     void addOutput(PassOwnPtr<AudioNodeOutput>);
-    
+
     // Called by processIfNecessary() to cause all parts of the rendering graph connected to us to process.
     // Each rendering quantum, the audio data for each of the AudioNode's inputs will be available after this method is called.
     // Called from context's audio thread.
     virtual void pullInputs(size_t framesToProcess);
 
     // Force all inputs to take any channel interpretation changes into account.
     void updateChannelsForInputs();
 
 private:
     volatile bool m_isInitialized;
     NodeType m_nodeType;
     RefPtr<AudioContext> m_context;
     float m_sampleRate;
     Vector<OwnPtr<AudioNodeInput> > m_inputs;
     Vector<OwnPtr<AudioNodeOutput> > m_outputs;
 
+    EventTargetData m_eventTargetData;
+
     double m_lastProcessingTime;
     double m_lastNonSilentTime;
 
     // Ref-counting
     volatile int m_normalRefCount;
     volatile int m_connectionRefCount;
-    
+
     bool m_isMarkedForDeletion;
     bool m_isDisabled;
 
 #if DEBUG_AUDIONODE_REFERENCES
     static bool s_isNodeCountInitialized;
     static int s_nodeCount[NodeTypeEnd];
 #endif
 
+    virtual void refEventTarget() OVERRIDE { ref(); }
+    virtual void derefEventTarget() OVERRIDE { deref(); }
+
 protected:
     unsigned m_channelCount;
     ChannelCountMode m_channelCountMode;
     AudioBus::ChannelInterpretation m_channelInterpretation;
 };
 
 } // namespace WebCore
 
 #endif // AudioNode_h