Implementation of 'AudioContext.getOutputTimestamp' method

third_party/WebKit/Source/modules/webaudio/BaseAudioContext.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 220 matching lines @@
   // nodes reference all nodes they're connected to.  All nodes are ultimately
   // connected to the AudioDestinationNode.  When the context release a source
   // node, it will be deactivated from the rendering graph along with all
   // other nodes it is uniquely connected to.
   void notifySourceNodeStartedProcessing(AudioNode*);
   // When a source node has no more processing to do (has finished playing),
   // this method tells the context to release the corresponding node.
   void notifySourceNodeFinishedProcessing(AudioHandler*);
 
   // Called at the start of each render quantum.
-  void handlePreRenderTasks();
+  void handlePreRenderTasks(const AudioIOPosition& outputPosition);
 
   // Called at the end of each render quantum.
   void handlePostRenderTasks();
 
   // Called periodically at the end of each render quantum to release finished
   // source nodes.
   void releaseFinishedSourceNodes();
 
   // Keeps track of the number of connections made.
   void incrementConnectionCount() {
@@ skipping 87 matching lines @@
 
   void rejectPendingDecodeAudioDataResolvers();
 
   // If any, unlock user gesture requirements if a user gesture is being
   // processed.
   void maybeUnlockUserGesture();
 
   // Returns whether the AudioContext is allowed to start rendering.
   bool isAllowedToStart() const;
 
+  AudioIOPosition outputPosition();
+
  private:
   friend class BaseAudioContextTest;
 
   // Do not change the order of this enum, it is used for metrics.
   enum AutoplayStatus {
     // The AudioContext failed to activate because of user gesture requirements.
     AutoplayStatusFailed = 0,
     // Same as AutoplayStatusFailed but start() on a node was called with a user
     // gesture.
     AutoplayStatusFailedWithStart = 1,
@@ skipping 83 matching lines @@
   Member<PeriodicWave> m_periodicWaveSine;
   Member<PeriodicWave> m_periodicWaveSquare;
   Member<PeriodicWave> m_periodicWaveSawtooth;
   Member<PeriodicWave> m_periodicWaveTriangle;
 
   // This is considering 32 is large enough for multiple channels audio.
   // It is somewhat arbitrary and could be increased if necessary.
   enum { MaxNumberOfChannels = 32 };
 
   Optional<AutoplayStatus> m_autoplayStatus;
+  AudioIOPosition m_outputPosition;
 };
 
 }  // namespace blink
 
 #endif  // BaseAudioContext_h