libsidplayfp 2.12.0
ExternalFilter.h
1/*
2 * This file is part of libsidplayfp, a SID player engine.
3 *
4 * Copyright 2011-2020 Leandro Nini <drfiemost@users.sourceforge.net>
5 * Copyright 2007-2010 Antti Lankila
6 * Copyright 2004 Dag Lem <resid@nimrod.no>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 */
22
23#ifndef EXTERNALFILTER_H
24#define EXTERNALFILTER_H
25
26#include "siddefs-fp.h"
27
28namespace reSIDfp
29{
30
66{
67private:
69 int Vlp;
70
72 int Vhp;
73
74 int w0lp_1_s7 = 0;
75
76 int w0hp_1_s17 = 0;
77
78public:
84 int clock(int input);
85
90
96 void setClockFrequency(double frequency);
97
101 void reset();
102};
103
104} // namespace reSIDfp
105
106#if RESID_INLINING || defined(EXTERNALFILTER_CPP)
107
108namespace reSIDfp
109{
110
111RESID_INLINE
113{
114 const int Vi = (input<<11) - (1 << (11+15));
115 const int dVlp = (w0lp_1_s7 * (Vi - Vlp) >> 7);
116 const int dVhp = (w0hp_1_s17 * (Vlp - Vhp) >> 17);
117 Vlp += dVlp;
118 Vhp += dVhp;
119 return (Vlp - Vhp) >> 11;
120}
121
122} // namespace reSIDfp
123
124#endif
125
126#endif
int clock(int input)
Definition ExternalFilter.h:112
void reset()
Definition ExternalFilter.cpp:59
void setClockFrequency(double frequency)
Definition ExternalFilter.cpp:46
ExternalFilter()
Definition ExternalFilter.cpp:41