Implementation of 'AudioContext.getOutputTimestamp' method

third_party/WebKit/Source/platform/audio/AudioDestination.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
@@ skipping 128 matching lines @@
 float AudioDestination::hardwareSampleRate()
 {
     return static_cast<float>(Platform::current()->audioHardwareSampleRate());
 }
 
 unsigned long AudioDestination::maxChannelCount()
 {
     return static_cast<float>(Platform::current()->audioHardwareOutputChannels());
 }
 
-void AudioDestination::render(const WebVector<float*>& sourceData, const WebVector<float*>& audioData, size_t numberOfFrames)
+void AudioDestination::render(const WebVector<float*>& sourceData, const WebVector<float*>& audioData, size_t numberOfFrames, const WebAudioTimestamp& timestamp)
 {
+    m_outputTimestamp = timestamp;

[Raymond Toy, 2016/06/14 16:42:40]

Does this need to be protected by the mutex?

[Mikhail, 2016/06/17 09:36:57]

it looks like here it is always accessed on the same thread

     bool isNumberOfChannelsGood = audioData.size() == m_numberOfOutputChannels;
     if (!isNumberOfChannelsGood) {
         ASSERT_NOT_REACHED();
         return;
     }
 
     bool isBufferSizeGood = numberOfFrames == m_callbackBufferSize;
     if (!isBufferSizeGood) {
         ASSERT_NOT_REACHED();
         return;
@@ skipping 15 matching lines @@
 }
 
 void AudioDestination::provideInput(AudioBus* bus, size_t framesToProcess)
 {
     AudioBus* sourceBus = nullptr;
     if (m_inputFifo->framesInFifo() >= framesToProcess) {
         m_inputFifo->consume(m_inputBus.get(), framesToProcess);
         sourceBus = m_inputBus.get();
     }
 
-    m_callback.render(sourceBus, bus, framesToProcess);
+    m_callback.render(sourceBus, bus, framesToProcess, m_outputTimestamp);
 }
 
 } // namespace blink