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diff --git a/WebCore/webaudio/AudioBasicProcessorNode.h b/WebCore/webaudio/AudioBasicProcessorNode.h
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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.
+ */
+
+#ifndef AudioBasicProcessorNode_h
+#define AudioBasicProcessorNode_h
+
+#include "AudioNode.h"
+#include <wtf/PassRefPtr.h>
+#include <wtf/RefCounted.h>
+#include <wtf/Threading.h>
+
+namespace WebCore {
+
+class AudioBus;
+class AudioNodeInput;
+class AudioProcessor;
+    
+// AudioBasicProcessorNode is an AudioNode with one input and one output where the input and output have the same number of channels.
+class AudioBasicProcessorNode : public AudioNode {
+public:
+    AudioBasicProcessorNode(AudioContext*, double sampleRate);
+
+    // AudioNode
+    virtual void process(size_t framesToProcess);
+    virtual void pullInputs(size_t framesToProcess);
+    virtual void reset();
+    virtual void initialize();
+    virtual void uninitialize();
+
+    // Called in the main thread when the number of channels for the input may have changed.
+    virtual void checkNumberOfChannelsForInput(AudioNodeInput*);
+
+    // Returns the number of channels for both the input and the output.
+    unsigned numberOfChannels();
+
+protected:
+    AudioProcessor* processor() { return m_processor.get(); }
+    OwnPtr<AudioProcessor> m_processor;
+
+private:
+    // This synchronizes live channel count changes which require an uninitialization / re-initialization.
+    mutable Mutex m_processLock;
+};
+
+} // namespace WebCore
+
+#endif // AudioBasicProcessorNode_h