Implement Automations for PannerNode and AutioListener

third_party/WebKit/Source/platform/audio/EqualPowerPanner.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 18 matching lines @@
 
 namespace blink {
 
 // Common type of stereo panner as found in normal audio mixing equipment.
 
 class PLATFORM_EXPORT EqualPowerPanner final : public Panner {
 public:
     EqualPowerPanner(float sampleRate);
 
     void pan(double azimuth, double elevation, const AudioBus* inputBus, AudioBus* outputBuf, size_t framesToProcess) override;
+    void panWithSampleAccurateValues(double* azimuth, double* elevation, const AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) override;
 
-    void reset() override { m_isFirstRender = true; }
+    void reset() override { }

[hongchan, 2016/05/03 18:15:01]

If this doesn't do anything, why it's here?

[Raymond Toy, 2016/05/03 20:32:21]

reset() is abstract virtual function defined in Panner.h.

[hongchan, 2016/05/03 20:38:58]

Got it. Confirmed this is a 'thing' in our chromium code base.

 
     double tailTime() const override { return 0; }
     double latencyTime() const override { return 0; }
 
 private:
-    // For smoothing / de-zippering
-    bool m_isFirstRender;
-    double m_smoothingConstant;
-
-    double m_gainL;
-    double m_gainR;
+    void calculateDesiredGain(double& desiredGainL, double& desiredGainR, double azimuth, int numberOfChannels);
 };
 
 } // namespace blink
 
 #endif // EqualPowerPanner_h