Make ConvolverNode conform to spec

third_party/WebKit/Source/platform/audio/Reverb.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
@@ skipping 36 matching lines @@
   WTF_MAKE_NONCOPYABLE(Reverb);
 
  public:
   enum { MaxFrameSize = 256 };
 
   // renderSliceSize is a rendering hint, so the FFTs can be optimized to not
   // all occur at the same time (very bad when rendering on a real-time thread).
   Reverb(AudioBus* impulseResponseBuffer,
          size_t renderSliceSize,
          size_t maxFFTSize,
-         size_t numberOfChannels,
          bool useBackgroundThreads,
          bool normalize);
 
   void process(const AudioBus* sourceBus,
                AudioBus* destinationBus,
                size_t framesToProcess);
   void reset();
 
   size_t impulseResponseLength() const { return m_impulseResponseLength; }
   size_t latencyFrames() const;
 
  private:
   void initialize(AudioBus* impulseResponseBuffer,
                   size_t renderSliceSize,
                   size_t maxFFTSize,
-                  size_t numberOfChannels,
                   bool useBackgroundThreads);
 
   size_t m_impulseResponseLength;
+  // The actual number of channels in the response.  This can be less
+  // than the number of ReverbConvolver's in |m_convolvers|.
+  unsigned m_numberOfResponseChannels;
 
   Vector<std::unique_ptr<ReverbConvolver>> m_convolvers;
 
   // For "True" stereo processing
   RefPtr<AudioBus> m_tempBuffer;
 };
 
 }  // namespace blink
 
 #endif  // Reverb_h