Implement tail processing for AudioNodes

third_party/WebKit/Source/modules/webaudio/AnalyserNode.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 154 matching lines @@
     // But don't remove the AnalyserNode if there are no inputs
     // connected to the node.  The node needs to be pulled so that the
     // internal state is updated with the correct input signal (of
     // zeroes).
     if (number_of_input_connections && !need_automatic_pull_) {
       Context()->GetDeferredTaskHandler().AddAutomaticPullNode(this);
       need_automatic_pull_ = true;
     }
   }
 }
+
+bool AnalyserHandler::RequiresTailProcessing() const {
+  // Tail time is always non-zero so tail processing is required.
+  return true;
+}
+
+double AnalyserHandler::TailTime() const {
+  return 32768 / static_cast<double>(Context()->sampleRate());
+};
 // ----------------------------------------------------------------
 
 AnalyserNode::AnalyserNode(BaseAudioContext& context)
     : AudioBasicInspectorNode(context) {
   SetHandler(AnalyserHandler::Create(*this, context.sampleRate()));
 }
 
 AnalyserNode* AnalyserNode::Create(BaseAudioContext& context,
                                    ExceptionState& exception_state) {
   DCHECK(IsMainThread());
@@ skipping 90 matching lines @@
 
 void AnalyserNode::getFloatTimeDomainData(NotShared<DOMFloat32Array> array) {
   GetAnalyserHandler().GetFloatTimeDomainData(array.View());
 }
 
 void AnalyserNode::getByteTimeDomainData(NotShared<DOMUint8Array> array) {
   GetAnalyserHandler().GetByteTimeDomainData(array.View());
 }
 
 }  // namespace blink