Change the default panning mode from HRTF to equal-power

Source/modules/webaudio/PannerNode.cpp

 /*
  * 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 30 matching lines @@
 namespace blink {
 
 static void fixNANs(double &x)
 {
     if (std::isnan(x) || std::isinf(x))
         x = 0.0;
 }
 
 PannerNode::PannerNode(AudioContext* context, float sampleRate)
     : AudioNode(context, sampleRate)
-    , m_panningModel(Panner::PanningModelHRTF)
+    , m_panningModel(Panner::PanningModelEqualPower)
     , m_distanceModel(DistanceEffect::ModelInverse)
     , m_position(0, 0, 0)
     , m_orientation(1, 0, 0)
     , m_velocity(0, 0, 0)
     , m_isAzimuthElevationDirty(true)
     , m_isDistanceConeGainDirty(true)
     , m_isDopplerRateDirty(true)
     , m_lastGain(-1.0)
     , m_cachedAzimuth(0)
     , m_cachedElevation(0)
@@ skipping 129 matching lines @@
 
 String PannerNode::panningModel() const
 {
     switch (m_panningModel) {
     case Panner::PanningModelEqualPower:
         return "equalpower";
     case Panner::PanningModelHRTF:
         return "HRTF";
     default:
         ASSERT_NOT_REACHED();
-        return "HRTF";
+        return "equalpower";
     }
 }
 
 void PannerNode::setPanningModel(const String& model)
 {
     if (model == "equalpower")
         setPanningModel(Panner::PanningModelEqualPower);
     else if (model == "HRTF")
         setPanningModel(Panner::PanningModelHRTF);
 }
@@ skipping 425 matching lines @@
 
 void PannerNode::trace(Visitor* visitor)
 {
     visitor->trace(m_panner);
     AudioNode::trace(visitor);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)