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diff --git a/Source/WebCore/webaudio/RealtimeAnalyserNode.cpp b/Source/WebCore/webaudio/RealtimeAnalyserNode.cpp
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+++ b/Source/WebCore/webaudio/RealtimeAnalyserNode.cpp
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+/*
+ * 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
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#if ENABLE(WEB_AUDIO)
+
+#include "RealtimeAnalyserNode.h"
+
+#include "AudioNodeInput.h"
+#include "AudioNodeOutput.h"
+
+namespace WebCore {
+
+RealtimeAnalyserNode::RealtimeAnalyserNode(AudioContext* context, double sampleRate)
+    : AudioNode(context, sampleRate)
+{
+    addInput(adoptPtr(new AudioNodeInput(this)));
+    addOutput(adoptPtr(new AudioNodeOutput(this, 2)));
+    
+    setType(NodeTypeAnalyser);
+    
+    initialize();
+}
+
+RealtimeAnalyserNode::~RealtimeAnalyserNode()
+{
+    uninitialize();
+}
+
+void RealtimeAnalyserNode::process(size_t framesToProcess)
+{
+    AudioBus* outputBus = output(0)->bus();
+
+    if (!isInitialized() || !input(0)->isConnected()) {
+        outputBus->zero();
+        return;
+    }
+
+    AudioBus* inputBus = input(0)->bus();
+    
+    // Give the analyser the audio which is passing through this AudioNode.
+    m_analyser.writeInput(inputBus, framesToProcess);
+
+    // For in-place processing, our override of pullInputs() will just pass the audio data through unchanged if the channel count matches from input to output
+    // (resulting in inputBus == outputBus).  Otherwise, do an up-mix to stereo.
+    if (inputBus != outputBus)
+        outputBus->copyFrom(*inputBus);
+}
+
+// We override pullInputs() as an optimization allowing this node to take advantage of in-place processing,
+// where the input is simply passed through unprocessed to the output.
+// Note: this only applies if the input and output channel counts match.
+void RealtimeAnalyserNode::pullInputs(size_t framesToProcess)
+{
+    // Render input stream - try to render directly into output bus for pass-through processing where process() doesn't need to do anything...
+    input(0)->pull(output(0)->bus(), framesToProcess);
+}
+
+void RealtimeAnalyserNode::reset()
+{
+    m_analyser.reset();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)