Support for AudioContextOptions latencyHint.

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 34 matching lines @@
 #include "wtf/Threading.h"
 #include "wtf/Vector.h"
 #include "wtf/build_config.h"
 
 namespace blink {
 
 class AnalyserNode;
 class AudioBuffer;
 class AudioBufferCallback;
 class AudioBufferSourceNode;
+class AudioContextOptions;
 class AudioListener;
 class BaseAudioContextTest;
 class BiquadFilterNode;
 class ChannelMergerNode;
 class ChannelSplitterNode;
 class ConstantSourceNode;
 class ConvolverNode;
 class DelayNode;
 class Document;
 class DynamicsCompressorNode;
@@ skipping 29 matching lines @@
 
  public:
   // The state of an audio context.  On creation, the state is Suspended. The
   // state is Running if audio is being processed (audio graph is being pulled
   // for data). The state is Closed if the audio context has been closed.  The
   // valid transitions are from Suspended to either Running or Closed; Running
   // to Suspended or Closed. Once Closed, there are no valid transitions.
   enum AudioContextState { Suspended, Running, Closed };
 
   // Create an AudioContext for rendering to the audio hardware.
-  static BaseAudioContext* create(Document&, ExceptionState&);
+  static BaseAudioContext* create(Document&,
+                                  const AudioContextOptions&,
+                                  ExceptionState&);
 
   ~BaseAudioContext() override;
 
   DECLARE_VIRTUAL_TRACE();
 
   // Is the destination node initialized and ready to handle audio?
   bool isDestinationInitialized() const {
     AudioDestinationNode* dest = destination();
     return dest ? dest->audioDestinationHandler().isInitialized() : false;
   }
@@ skipping 16 matching lines @@
 
   double currentTime() const {
     // TODO: What is the correct value for the current time if the destination
     // node has gone away? 0 is a valid time.
     return m_destinationNode
                ? m_destinationNode->audioDestinationHandler().currentTime()
                : 0;
   }
 
   float sampleRate() const {
-    return m_destinationNode ? m_destinationNode->handler().sampleRate() : 0;
+    return m_destinationNode
+               ? m_destinationNode->audioDestinationHandler().sampleRate()
+               : closedContextSampleRate();
+  }
+
+  float framesPerBuffer() const {
+    return m_destinationNode
+               ? m_destinationNode->audioDestinationHandler().framesPerBuffer()
+               : 0;
   }
 
   size_t callbackBufferSize() const {
     return m_destinationNode ? m_destinationNode->handler().callbackBufferSize()
                              : 0;
   }
 
   String state() const;
   AudioContextState contextState() const { return m_contextState; }
   void throwExceptionForClosedState(ExceptionState&);
@@ skipping 313 matching lines @@
   // 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