Require use of AudioBus::create() to avoid ref-counting issues

Source/modules/webaudio/AudioParam.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
@@ skipping 118 matching lines @@
         float timelineValue = m_timeline.valueForContextTime(context(), narrowPrecisionToFloat(m_value), hasValue);
 
         if (hasValue)
             m_value = timelineValue;
 
         values[0] = narrowPrecisionToFloat(m_value);
     }
 
     // Now sum all of the audio-rate connections together (unity-gain summing junction).
     // Note that connections would normally be mono, but we mix down to mono if necessary.
-    AudioBus summingBus(1, numberOfValues, false);
-    summingBus.setChannelMemory(0, values, numberOfValues);
+    RefPtr<AudioBus> summingBus = AudioBus::create(1, numberOfValues, false);
+    summingBus->setChannelMemory(0, values, numberOfValues);
 
     for (unsigned i = 0; i < numberOfRenderingConnections(); ++i) {
         AudioNodeOutput* output = renderingOutput(i);
         ASSERT(output);
 
         // Render audio from this output.
         AudioBus* connectionBus = output->pull(0, AudioNode::ProcessingSizeInFrames);
 
         // Sum, with unity-gain.
-        summingBus.sumFrom(*connectionBus);
+        summingBus->sumFrom(*connectionBus);
     }
 }
 
 void AudioParam::calculateTimelineValues(float* values, unsigned numberOfValues)
 {
     // Calculate values for this render quantum.
     // Normally numberOfValues will equal AudioNode::ProcessingSizeInFrames (the render quantum size).
     double sampleRate = context()->sampleRate();
     double startTime = context()->currentTime();
     double endTime = startTime + numberOfValues / sampleRate;
@@ skipping 30 matching lines @@
     if (m_outputs.contains(output)) {
         m_outputs.remove(output);
         changedOutputs();
         output->removeParam(this);
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(WEB_AUDIO)