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diff --git a/WebCore/platform/audio/AudioProcessor.h b/WebCore/platform/audio/AudioProcessor.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:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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 AudioProcessor_h
+#define AudioProcessor_h
+
+namespace WebCore {
+
+class AudioBus;
+
+// AudioProcessor is an abstract base class representing an audio signal processing object with a single input and a single output,
+// where the number of input channels equals the number of output channels.  It can be used as one part of a complex DSP algorithm,
+// or as the processor for a basic (one input - one output) AudioNode.
+
+class AudioProcessor {
+public:
+    AudioProcessor(double sampleRate)
+        : m_initialized(false)
+        , m_sampleRate(sampleRate)
+    {
+    }
+
+    virtual ~AudioProcessor() { }
+
+    // Full initialization can be done here instead of in the constructor.
+    virtual void initialize() = 0;
+    virtual void uninitialize() = 0;
+
+    // Processes the source to destination bus.  The number of channels must match in source and destination.
+    virtual void process(AudioBus* source, AudioBus* destination, size_t framesToProcess) = 0;
+
+    // Resets filter state
+    virtual void reset() = 0;
+
+    virtual void setNumberOfChannels(unsigned) = 0;
+
+    bool isInitialized() const { return m_initialized; }
+
+    double sampleRate() const { return m_sampleRate; }
+
+protected:
+    bool m_initialized;
+    double m_sampleRate;
+};
+
+} // namespace WebCore
+
+#endif // AudioProcessor_h