Sub-sample accurate start of OscillatorNode

third_party/WebKit/Source/modules/webaudio/AudioBufferSourceNode.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 101 matching lines @@
     // is updated to the new number of channels because of use of tryLocks() in
     // the context's updating system.  In this case, if the the buffer has just
     // been changed and we're not quite ready yet, then just output silence.
     if (numberOfChannels() != buffer()->numberOfChannels()) {
       outputBus->zero();
       return;
     }
 
     size_t quantumFrameOffset;
     size_t bufferFramesToProcess;
+    double startTimeOffset;
 
     updateSchedulingInfo(framesToProcess, outputBus, quantumFrameOffset,
-                         bufferFramesToProcess);
+                         bufferFramesToProcess, startTimeOffset);
 
     if (!bufferFramesToProcess) {
       outputBus->zero();
       return;
     }
 
     for (unsigned i = 0; i < outputBus->numberOfChannels(); ++i)
       m_destinationChannels[i] = outputBus->channel(i)->mutableData();
 
     // Render by reading directly from the buffer.
@@ skipping 619 matching lines @@
 
 void AudioBufferSourceNode::start(double when,
                                   double grainOffset,
                                   double grainDuration,
                                   ExceptionState& exceptionState) {
   audioBufferSourceHandler().start(when, grainOffset, grainDuration,
                                    exceptionState);
 }
 
 }  // namespace blink