[DO NOT SUBMIT] AudioWorklet FS2: audio thread

third_party/WebKit/Source/platform/audio/AudioIOCallback.h

 /*
  * Copyright (C) 2012 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
@@ skipping 15 matching lines @@
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef AudioIOCallback_h
 #define AudioIOCallback_h
 
 namespace blink {
 
 class AudioBus;
 
-// Abstract base-class for isochronous audio I/O client.
+// Abstract base-class for isochronous render. (e.g. AudioDestinationNode)
 class AudioIOCallback {
+
 public:
-    // render() is called periodically to get the next render quantum of audio into destinationBus.
-    // Optional audio input is given in sourceBus (if it's not 0).
-    virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t framesToProcess) = 0;
+    virtual ~AudioIOCallback() { }
 
-    virtual ~AudioIOCallback() { }
+    // render() is called periodically to get the next render quantum of audio
+    // into the destination bus. Optional external audio input is given in the
+    // source bus. (e.g. live audio input)
+    virtual void render(AudioBus* source, AudioBus* destination, size_t framesToProcess) = 0;
 };
 
 } // namespace blink
 
 #endif // AudioIOCallback_h