Implement tail processing for AudioNodes

third_party/WebKit/Source/platform/audio/AudioDSPKernelProcessor.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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 118 matching lines @@
 
 void AudioDSPKernelProcessor::SetNumberOfChannels(unsigned number_of_channels) {
   if (number_of_channels == number_of_channels_)
     return;
 
   DCHECK(!IsInitialized());
   if (!IsInitialized())
     number_of_channels_ = number_of_channels;
 }
 
+bool AudioDSPKernelProcessor::RequiresTailProcessing() const {
+  // Always return true even if the tail time and latency might both
+  // be zero.
+  return true;
+}
+
 double AudioDSPKernelProcessor::TailTime() const {
   DCHECK(!IsMainThread());
   MutexTryLocker try_locker(process_lock_);
   if (try_locker.Locked()) {
     // It is expected that all the kernels have the same tailTime.
     return !kernels_.IsEmpty() ? kernels_.front()->TailTime() : 0;
   }
   // Since we don't want to block the Audio Device thread, we return a large
   // value instead of trying to acquire the lock.
   return std::numeric_limits<double>::infinity();
 }
 
 double AudioDSPKernelProcessor::LatencyTime() const {
   DCHECK(!IsMainThread());
   MutexTryLocker try_locker(process_lock_);
   if (try_locker.Locked()) {
     // It is expected that all the kernels have the same latencyTime.
     return !kernels_.IsEmpty() ? kernels_.front()->LatencyTime() : 0;
   }
   // Since we don't want to block the Audio Device thread, we return a large
   // value instead of trying to acquire the lock.
   return std::numeric_limits<double>::infinity();
 }
 
 }  // namespace blink