/*

 * 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.

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") 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 APPLE 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

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 */

#ifndef ZeroPole_h

#define ZeroPole_h

namespace WebCore {

// ZeroPole is a simple filter with one zero and one pole.

class ZeroPole {

public:

    ZeroPole()

        : m_zero(0)

        , m_pole(0)

        , m_lastX(0)

        , m_lastY(0)

    {

    }

    void process(const float *source, float *destination, int framesToProcess);

    // Reset filter state.

    void reset() { m_lastX = 0; m_lastY = 0; }

    void setZero(float zero) { m_zero = zero; }

    void setPole(float pole) { m_pole = pole; }

    float zero() const { return m_zero; }

    float pole() const { return m_pole; }

private:

    float m_zero;

    float m_pole;

    float m_lastX;

    float m_lastY;

};

} // namespace WebCore

#endif // ZeroPole_h