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diff --git a/Source/WebCore/webaudio/BiquadFilterNode.cpp b/Source/WebCore/webaudio/BiquadFilterNode.cpp
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index 000000000..80c3f938c
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+++ b/Source/WebCore/webaudio/BiquadFilterNode.cpp
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+/*
+ * 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
+ *    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 "BiquadFilterNode.h"
+
+#include "ExceptionCode.h"
+
+namespace WebCore {
+
+BiquadFilterNode::BiquadFilterNode(AudioContext* context, float sampleRate)
+    : AudioBasicProcessorNode(context, sampleRate)
+{
+    // Initially setup as lowpass filter.
+    m_processor = adoptPtr(new BiquadProcessor(BiquadProcessor::LowPass, sampleRate, 1, false));
+    biquadProcessor()->parameter1()->setContext(context);
+    biquadProcessor()->parameter2()->setContext(context);
+    biquadProcessor()->parameter3()->setContext(context);
+    setNodeType(NodeTypeBiquadFilter);
+}
+
+void BiquadFilterNode::setType(unsigned short type, ExceptionCode& ec)
+{
+    if (type > BiquadProcessor::Allpass) {
+        ec = NOT_SUPPORTED_ERR;
+        return;
+    }
+    
+    biquadProcessor()->setType(static_cast<BiquadProcessor::FilterType>(type));
+}
+
+
+void BiquadFilterNode::getFrequencyResponse(const Float32Array* frequencyHz,
+                                            Float32Array* magResponse,
+                                            Float32Array* phaseResponse)
+{
+    if (!frequencyHz || !magResponse || !phaseResponse)
+        return;
+    
+    int n = std::min(frequencyHz->length(),
+                     std::min(magResponse->length(), phaseResponse->length()));
+
+    if (n) {
+        biquadProcessor()->getFrequencyResponse(n,
+                                                frequencyHz->data(),
+                                                magResponse->data(),
+                                                phaseResponse->data());
+    }
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_AUDIO)