Implement tail processing for AudioNodes

third_party/WebKit/Source/modules/webaudio/BiquadDSPKernel.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 38 matching lines @@
                size_t frames_to_process) override;
   void Reset() override { biquad_.Reset(); }
 
   // Get the magnitude and phase response of the filter at the given
   // set of frequencies (in Hz). The phase response is in radians.
   void GetFrequencyResponse(int n_frequencies,
                             const float* frequency_hz,
                             float* mag_response,
                             float* phase_response);
 
+  bool RequiresTailProcessing() const override;
   double TailTime() const override;
   double LatencyTime() const override;
 
  protected:
   Biquad biquad_;
   BiquadProcessor* GetBiquadProcessor() {
     return static_cast<BiquadProcessor*>(Processor());
   }
 
   // To prevent audio glitches when parameters are changed,
@@ skipping 14 matching lines @@
   // Synchronize process() with getting and setting the filter coefficients.
   mutable Mutex process_lock_;
 
   // The current tail time for biquad filter.
   double tail_time_;
 };
 
 }  // namespace blink
 
 #endif  // BiquadDSPKernel_h