Implement StereoPannerNode for robust stereo panning

Source/modules/webaudio/AudioContext.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 50 matching lines @@
 class ExceptionState;
 class GainNode;
 class HTMLMediaElement;
 class MediaElementAudioSourceNode;
 class MediaStreamAudioDestinationNode;
 class MediaStreamAudioSourceNode;
 class OscillatorNode;
 class PannerNode;
 class PeriodicWave;
 class ScriptProcessorNode;
+class StereoPannerNode;
 class WaveShaperNode;
 
 // AudioContext is the cornerstone of the web audio API and all AudioNodes are created from it.
 // For thread safety between the audio thread and the main thread, it has a rendering graph locking mechanism.
 
 class AudioContext : public RefCountedGarbageCollectedWillBeGarbageCollectedFinalized<AudioContext>, public ActiveDOMObject, public EventTargetWithInlineData {
     DEFINE_EVENT_TARGET_REFCOUNTING_WILL_BE_REMOVED(RefCountedGarbageCollected<AudioContext>);
     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(AudioContext);
 public:
@@ skipping 34 matching lines @@
     DelayNode* createDelay(ExceptionState&);
     DelayNode* createDelay(double maxDelayTime, ExceptionState&);
     PannerNode* createPanner();
     ConvolverNode* createConvolver();
     DynamicsCompressorNode* createDynamicsCompressor();
     AnalyserNode* createAnalyser();
     ScriptProcessorNode* createScriptProcessor(ExceptionState&);
     ScriptProcessorNode* createScriptProcessor(size_t bufferSize, ExceptionState&);
     ScriptProcessorNode* createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, ExceptionState&);
     ScriptProcessorNode* createScriptProcessor(size_t bufferSize, size_t numberOfInputChannels, size_t numberOfOutputChannels, ExceptionState&);
+    StereoPannerNode* createStereoPanner();
     ChannelSplitterNode* createChannelSplitter(ExceptionState&);
     ChannelSplitterNode* createChannelSplitter(size_t numberOfOutputs, ExceptionState&);
     ChannelMergerNode* createChannelMerger(ExceptionState&);
     ChannelMergerNode* createChannelMerger(size_t numberOfInputs, ExceptionState&);
     OscillatorNode* createOscillator();
     PeriodicWave* createPeriodicWave(DOMFloat32Array* real, DOMFloat32Array* imag, ExceptionState&);
 
     // When a source node has no more processing to do (has finished playing), then it tells the context to dereference it.
     void notifyNodeFinishedProcessing(AudioNode*);
 
@@ skipping 212 matching lines @@
     HashSet<AudioNode*> m_deferredCountModeChange;
 
     // This is considering 32 is large enough for multiple channels audio.
     // It is somewhat arbitrary and could be increased if necessary.
     enum { MaxNumberOfChannels = 32 };
 };
 
 } // namespace blink
 
 #endif // AudioContext_h