2 Copyright (C) 2012 Fons Adriaensen <fons@linuxaudio.org>
3 Adopted for Ardour 2013 by Robin Gareus <robin@gareus.org>
5 This program is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #ifndef __IEC2PPMDSP_H
21 #define __IEC2PPMDSP_H
23 #include "ardour/libardour_visibility.h"
25 class LIBARDOUR_API Iec2ppmdsp
32 void process (float const *p, int n);
36 static void init (float fsamp);
40 float _z1; // filter state
41 float _z2; // filter state
42 float _m; // max value since last read()
43 bool _res; // flag to reset m
45 static float _w1; // attack filter coefficient
46 static float _w2; // attack filter coefficient
47 static float _w3; // release filter coefficient
48 static float _g; // gain factor