Implement tail processing for AudioNodes

third_party/WebKit/Source/modules/webaudio/PannerNode.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 85 matching lines @@
                                     orientation_z));
 }
 
 PannerHandler::~PannerHandler() {
   Uninitialize();
 }
 
 void PannerHandler::Process(size_t frames_to_process) {
   AudioBus* destination = Output(0).Bus();
 
-  if (!IsInitialized() || !Input(0).IsConnected() || !panner_.get()) {
+  if (!IsInitialized() || !panner_.get()) {
     destination->Zero();
     return;
   }
 
   AudioBus* source = Input(0).Bus();
   if (!source) {
     destination->Zero();
     return;
   }
 
@@ skipping 514 matching lines @@
                    current_orientation != last_orientation_;
 
   if (has_moved) {
     last_position_ = current_position;
     last_orientation_ = current_orientation;
 
     MarkPannerAsDirty(PannerHandler::kAzimuthElevationDirty |
                       PannerHandler::kDistanceConeGainDirty);
   }
 }
+
+bool PannerHandler::RequiresTailProcessing() const {
+  // If there's no panner set up yet, assume we require tail
+  // processing in case the HRTF panner is set later, which does
+  // require tail processing.
+  return panner_ ? panner_->RequiresTailProcessing() : true;
+}
+
 // ----------------------------------------------------------------
 
 PannerNode::PannerNode(BaseAudioContext& context)
     : AudioNode(context),
       position_x_(AudioParam::Create(context, kParamTypePannerPositionX, 0.0)),
       position_y_(AudioParam::Create(context, kParamTypePannerPositionY, 0.0)),
       position_z_(AudioParam::Create(context, kParamTypePannerPositionZ, 0.0)),
       orientation_x_(
           AudioParam::Create(context, kParamTypePannerOrientationX, 1.0)),
       orientation_y_(
@@ skipping 147 matching lines @@
   visitor->Trace(position_z_);
 
   visitor->Trace(orientation_x_);
   visitor->Trace(orientation_y_);
   visitor->Trace(orientation_z_);
 
   AudioNode::Trace(visitor);
 }
 
 }  // namespace blink