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

// Copyright 2016 The Chromium Authors. All rights reserved.
// 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"

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;
};

} // namespace blink

#endif // IIRFilterNode_h