Support for AudioContextOptions latencyHint.

third_party/WebKit/Source/modules/webaudio/MediaElementAudioSourceNode.cpp

 /*
  * Copyright (C) 2011, 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 81 matching lines @@
       return;
     }
 
     // Synchronize with process() to protect m_sourceNumberOfChannels,
     // m_sourceSampleRate, and m_multiChannelResampler.
     Locker<MediaElementAudioSourceHandler> locker(*this);
 
     m_sourceNumberOfChannels = numberOfChannels;
     m_sourceSampleRate = sourceSampleRate;
 
-    if (sourceSampleRate != sampleRate()) {
-      double scaleFactor = sourceSampleRate / sampleRate();
+    if (sourceSampleRate != context()->sampleRate()) {
+      double scaleFactor = sourceSampleRate / context()->sampleRate();
       m_multiChannelResampler =
           WTF::makeUnique<MultiChannelResampler>(scaleFactor, numberOfChannels);
     } else {
       // Bypass resampling.
       m_multiChannelResampler.reset();
     }
 
     {
       // The context must be locked when changing the number of output channels.
       BaseAudioContext::AutoLocker contextLocker(context());
@@ skipping 56 matching lines @@
   MutexTryLocker tryLocker(m_processLock);
   if (tryLocker.locked()) {
     if (!mediaElement() || !m_sourceNumberOfChannels || !m_sourceSampleRate) {
       outputBus->zero();
       return;
     }
     AudioSourceProvider& provider = mediaElement()->getAudioSourceProvider();
     // Grab data from the provider so that the element continues to make
     // progress, even if we're going to output silence anyway.
     if (m_multiChannelResampler.get()) {
-      DCHECK_NE(m_sourceSampleRate, sampleRate());
+      DCHECK_NE(m_sourceSampleRate, context()->sampleRate());
       m_multiChannelResampler->process(&provider, outputBus, numberOfFrames);
     } else {
       // Bypass the resampler completely if the source is at the context's
       // sample-rate.
-      DCHECK_EQ(m_sourceSampleRate, sampleRate());
+      DCHECK_EQ(m_sourceSampleRate, context()->sampleRate());
       provider.provideInput(outputBus, numberOfFrames);
     }
     // Output silence if we don't have access to the element.
     if (!passesCORSAccessCheck()) {
       if (m_maybePrintCORSMessage) {
         // Print a CORS message, but just once for each change in the current
         // media element source, and only if we have a document to print to.
         m_maybePrintCORSMessage = false;
         if (context()->getExecutionContext()) {
           context()->getExecutionContext()->postTask(
@@ skipping 99 matching lines @@
 
 void MediaElementAudioSourceNode::lock() {
   mediaElementAudioSourceHandler().lock();
 }
 
 void MediaElementAudioSourceNode::unlock() {
   mediaElementAudioSourceHandler().unlock();
 }
 
 }  // namespace blink