Implementation of 'AudioContext.getOutputTimestamp' method

third_party/WebKit/Source/modules/webaudio/AbstractAudioContext.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 249 matching lines @@
 
     // Get the PeriodicWave for the specified oscillator type.  The table is initialized internally
     // if necessary.
     PeriodicWave* periodicWave(int type);
 
     // Check whether the AudioContext requires a user gesture and whether the
     // current stack is processing user gesture and record these information in
     // a histogram.
     void recordUserGestureState();
 
+    // Gets the audio timestamp of the currently audiable signal.
+    void getOutputTimestamp(AudioTimestamp&);
+
+    // Output timestamp to be set from destination handler.
+    void setWebAudioTimestamp(const WebAudioTimestamp&);
+
 protected:
     explicit AbstractAudioContext(Document*);
     AbstractAudioContext(Document*, unsigned numberOfChannels, size_t numberOfFrames, float sampleRate);
 
     void initialize();
     void uninitialize();
 
     void setContextState(AudioContextState);
 
     virtual void didClose() {}
@@ skipping 88 matching lines @@
     // they can be shared with all OscillatorNodes in the context.  To conserve memory, these are
     // lazily initiialized on first use.
     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 };
+
+    // Output audio stream timestamp.
+    WebAudioTimestamp m_outputTimestamp;
 };
 
 } // namespace blink
 
 #endif // AbstractAudioContext_h