Implement IIRFilter node for WebAudio.

third_party/WebKit/Source/modules/webaudio/IIRFilterNode.h

Index: third_party/WebKit/Source/modules/webaudio/IIRFilterNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.h b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.h
new file mode 100644
index 0000000000000000000000000000000000000000..77251a2d4bd96e532e3942d1dd7a2aff8d366016
--- /dev/null
+++ b/third_party/WebKit/Source/modules/webaudio/IIRFilterNode.h
@@ -0,0 +1,39 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.

[tkent, 2016/01/13 03:28:28]

2016

[Raymond Toy, 2016/01/13 18:30:53]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IIRFilterNode_h
+#define IIRFilterNode_h
+
+#include "core/dom/DOMTypedArray.h"
+#include "modules/webaudio/AudioNode.h"
+#include "modules/webaudio/IIRProcessor.h"
+#include "wtf/build_config.h"

[tkent, 2016/01/13 03:28:28]

Probably wtf/build_config.h is unnecessary.  This file doesn't use macros
defined in it.

[Raymond Toy, 2016/01/13 18:30:53]

Done.

+
+namespace blink {
+
+class AbstractAudioContext;
+class ExceptionState;
+
+class IIRFilterNode : public AudioNode {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    static IIRFilterNode* create(AbstractAudioContext& context, float sampleRate, const Vector<double> feedforward, const Vector<double> feedback)
+    {
+        return new IIRFilterNode(context, sampleRate, feedforward, feedback);
+    }
+    DECLARE_VIRTUAL_TRACE();
+
+    // Get the magnitude and phase response of the filter at the given
+    // set of frequencies (in Hz). The phase response is in radians.
+    void getFrequencyResponse(const DOMFloat32Array* frequencyHz, DOMFloat32Array* magResponse, DOMFloat32Array* phaseResponse, ExceptionState&);
+
+private:
+    IIRFilterNode(AbstractAudioContext&, float sampleRate, const Vector<double> denominator, const Vector<double> numerator);
+
+    IIRProcessor* iirProcessor() const;
+};
+
+}
+
+#endif // IIRFilterNode_h