Implement tail processing for AudioNodes

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 212 matching lines @@
   size_t buffer_length = Buffer()->length();
   double buffer_sample_rate = Buffer()->sampleRate();
 
   // Avoid converting from time to sample-frames twice by computing
   // the grain end time first before computing the sample frame.
   unsigned end_frame =
       is_grain_ ? AudioUtilities::TimeToSampleFrame(
                       grain_offset_ + grain_duration_, buffer_sample_rate)
                 : buffer_length;
 
-  // This is a HACK to allow for HRTF tail-time - avoids glitch at end.
-  // FIXME: implement tailTime for each AudioNode for a more general solution to
-  // this problem, https://bugs.webkit.org/show_bug.cgi?id=77224
-  if (is_grain_)
-    end_frame += 512;
-
   // Do some sanity checking.
   if (end_frame > buffer_length)
     end_frame = buffer_length;
 
   // If the .loop attribute is true, then values of
   // m_loopStart == 0 && m_loopEnd == 0 implies that we should use the entire
   // buffer as the loop, otherwise use the loop values in m_loopStart and
   // m_loopEnd.
   double virtual_end_frame = end_frame;
   double virtual_delta_frames = end_frame;
@@ skipping 514 matching lines @@
 
 void AudioBufferSourceNode::start(double when,
                                   double grain_offset,
                                   double grain_duration,
                                   ExceptionState& exception_state) {
   GetAudioBufferSourceHandler().Start(when, grain_offset, grain_duration,
                                       exception_state);
 }
 
 }  // namespace blink