File: acfilter.h

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jnoisemeter 0.2.2-1
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// ----------------------------------------------------------------------------
//
//  Copyright (C) 2010-2018 Fons Adriaensen <fons@linuxaudio.org>
//    
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
//
// ----------------------------------------------------------------------------


#ifndef __ACFILTER_H
#define __ACFILTER_H


#include <stdlib.h>


class ACfilter
{
public:

    ACfilter (void) : _err (true) {}
    ~ACfilter (void) {}

    int  init (int fsamp);
    void reset (void);
    void process (size_t n, const float *in, float *opA, float *opC);

private:

    bool  _err;
    float _w1, _w2, _w3, _w4, _ga, _gc;       // filter coefficients and gains
    float _z1a, _z1b, _z2, _z3, _z4a, _z4b;   // filter state
};


#endif