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diff --git a/Source/WebCore/platform/audio/Panner.h b/Source/WebCore/platform/audio/Panner.h
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+/*
+ * Copyright (C) 2009 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.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 Panner_h
+#define Panner_h
+
+#include <wtf/PassOwnPtr.h>
+
+namespace WebCore {
+
+class AudioBus;
+
+// Abstract base class for panning a mono or stereo source.
+
+class Panner {
+public:
+    enum {
+        PanningModelEqualPower = 0,
+        PanningModelHRTF = 1,
+        PanningModelSoundField = 2
+    };
+    
+    typedef unsigned PanningModel;
+
+    static PassOwnPtr<Panner> create(PanningModel model, double sampleRate);
+
+    virtual ~Panner() { };
+
+    PanningModel panningModel() const { return m_panningModel; }
+
+    virtual void pan(double azimuth, double elevation, AudioBus* inputBus, AudioBus* outputBus, size_t framesToProcess) = 0;
+
+    virtual void reset() = 0;
+
+protected:
+    Panner(PanningModel model) : m_panningModel(model) { }
+
+    PanningModel m_panningModel;
+};
+
+} // namespace WebCore
+
+#endif // Panner_h