Set channelCount and maxChannelCount correctly for OfflineAudioContext.

third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.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 31 matching lines @@
     : AudioDestinationHandler(node, renderTarget->sampleRate())
     , m_renderTarget(renderTarget)
     , m_renderThread(adoptPtr(Platform::current()->createThread("offline audio renderer")))
     , m_framesProcessed(0)
     , m_framesToProcess(0)
     , m_isRenderingStarted(false)
     , m_shouldSuspend(false)
 {
     m_renderBus = AudioBus::create(renderTarget->numberOfChannels(), renderQuantumSize);
     m_framesToProcess = m_renderTarget->length();
+
+    // Node-specific defaults.
+    m_channelCount = m_renderTarget->numberOfChannels();
+    m_channelCountMode = Explicit;
+    m_channelInterpretation = AudioBus::Speakers;
 }
 
 PassRefPtr<OfflineAudioDestinationHandler> OfflineAudioDestinationHandler::create(AudioNode& node, AudioBuffer* renderTarget)
 {
     return adoptRef(new OfflineAudioDestinationHandler(node, renderTarget));
 }
 
 OfflineAudioDestinationHandler::~OfflineAudioDestinationHandler()
 {
     ASSERT(!isInitialized());
@@ skipping 22 matching lines @@
         m_renderThread.clear();
 
     AudioHandler::uninitialize();
 }
 
 OfflineAudioContext* OfflineAudioDestinationHandler::context() const
 {
     return static_cast<OfflineAudioContext*>(AudioDestinationHandler::context());
 }
 
+unsigned long OfflineAudioDestinationHandler::maxChannelCount() const
+{
+    return m_channelCount;
+}
+
 void OfflineAudioDestinationHandler::startRendering()
 {
     ASSERT(isMainThread());
     ASSERT(m_renderThread);
     ASSERT(m_renderTarget);
 
     if (!m_renderTarget)
         return;
 
     // Rendering was not started. Starting now.
@@ skipping 204 matching lines @@
 {
     setHandler(OfflineAudioDestinationHandler::create(*this, renderTarget));
 }
 
 OfflineAudioDestinationNode* OfflineAudioDestinationNode::create(AbstractAudioContext* context, AudioBuffer* renderTarget)
 {
     return new OfflineAudioDestinationNode(*context, renderTarget);
 }
 
 } // namespace blink