Looping AudioBufferSourceNodes stop only if duration is explicitly given.

Source/modules/webaudio/AudioBufferSourceNode.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 80 matching lines @@
     // AudioScheduledSourceNode
     virtual void finish() override;
 
     void handleStoppableSourceNode();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     AudioBufferSourceNode(AudioContext*, float sampleRate);
 
+    void startSource(double when, double grainOffset, double grainDuration, bool isDurationGiven, ExceptionState&);
+
     // Returns true on success.
     bool renderFromBuffer(AudioBus*, unsigned destinationFrameOffset, size_t numberOfFrames);
 
     // Render silence starting from "index" frame in AudioBus.
     inline bool renderSilenceAndFinishIfNotLooping(AudioBus*, unsigned index, size_t framesToProcess);
 
     // Clamps grain parameters to the duration of the given AudioBuffer.
     void clampGrainParameters(const AudioBuffer*);
 
     // m_buffer holds the sample data which this node outputs.
@@ skipping 14 matching lines @@
     double m_loopEnd;
 
     // m_virtualReadIndex is a sample-frame index into our buffer representing the current playback position.
     // Since it's floating-point, it has sub-sample accuracy.
     double m_virtualReadIndex;
 
     // Granular playback
     bool m_isGrain;
     double m_grainOffset; // in seconds
     double m_grainDuration; // in seconds
-
+    // True if grainDuration is given explicitly (via 3 arg start method).
+    bool m_isDurationGiven;
     // totalPitchRate() returns the instantaneous pitch rate (non-time preserving).
     // It incorporates the base pitch rate, any sample-rate conversion factor from the buffer, and any doppler shift from an associated panner node.
     double totalPitchRate();
 
     // We optionally keep track of a panner node which has a doppler shift that
     // is incorporated into the pitch rate.
     // This RefPtr is connection reference. We must call AudioNode::
     // makeConnection() after ref(), and call AudioNode::breakConnection()
     // before deref().
     // Oilpan: This holds connection references. We must call
     // AudioNode::makeConnection when we add an AudioNode to this, and must call
     // AudioNode::breakConnection() when we remove an AudioNode from this.
     Member<PannerNode> m_pannerNode;
 
     // This synchronizes process() with setBuffer() which can cause dynamic channel count changes.
     mutable Mutex m_processLock;
 };
 
 } // namespace blink
 
 #endif // AudioBufferSourceNode_h