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kmeterdsp.h

/*
    Copyright (C) 2008 Fons Adriaensen <fons@kokkinizita.net>
    
    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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


#ifndef __KMETERDSP_H
#define     __KMETERDSP_H


class Kmeterdsp
{
public:

    Kmeterdsp (void);
    ~Kmeterdsp (void);

    void process (float *p, int n);  
    void read (float *rms, float *dpk);

    static void init (int fsamp, int fsize, float hold, float fall);

private:

    float          _z1;          // filter state
    float          _z2;          // filter state
    float          _rms;         // max rms value since last read()
    float          _dpk;         // current digital peak value
    int            _cnt;       // digital peak hold counter
    bool           _flag;        // flag set by read(), resets _rms


    static int     _hold;        // number of JACK periods to hold peak value
    static float   _fall;        // per period fallback multiplier for peak value
    static float   _omega;       // ballistics filter constant.
};


#endif

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