BiquadFilterNode.h   [plain text]

/*
 * Copyright (C) 2011, Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
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 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
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 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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#pragma once

#include "AudioBasicProcessorNode.h"
#include "BiquadProcessor.h"

namespace WebCore {

class AudioParam;

class BiquadFilterNode : public AudioBasicProcessorNode {
public:
    static Ref<BiquadFilterNode> create(AudioContext& context, float sampleRate)
    {
        return adoptRef(*new BiquadFilterNode(context, sampleRate));
    }

    BiquadFilterType type() const;
    void setType(BiquadFilterType);

    AudioParam* frequency() { return biquadProcessor()->parameter1(); }
    AudioParam* q() { return biquadProcessor()->parameter2(); }
    AudioParam* gain() { return biquadProcessor()->parameter3(); }
    AudioParam* detune() { return biquadProcessor()->parameter4(); }

    // 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 RefPtr<Float32Array>& frequencyHz, const RefPtr<Float32Array>& magResponse, const RefPtr<Float32Array>& phaseResponse);

private:
    BiquadFilterNode(AudioContext&, float sampleRate);

    BiquadProcessor* biquadProcessor() { return static_cast<BiquadProcessor*>(processor()); }
};

} // namespace WebCore