libsidplayfp 2.4.2
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
65{
66private:
68 int Vlp;
69
71 int Vhp;
72
73 int w0lp_1_s7;
74
75 int w0hp_1_s17;
76
77public:
83 int clock(unsigned short input);
84
89
95 void setClockFrequency(double frequency);
96
100 void reset();
101};
102
103} // namespace reSIDfp
104
105#if RESID_INLINING || defined(EXTERNALFILTER_CPP)
106
107namespace reSIDfp
108{
109
110RESID_INLINE
111int ExternalFilter::clock(unsigned short input)
112{
113 const int Vi = (static_cast<unsigned int>(input)<<11) - (1 << (11+15));
114 const int dVlp = (w0lp_1_s7 * (Vi - Vlp) >> 7);
115 const int dVhp = (w0hp_1_s17 * (Vlp - Vhp) >> 17);
116 Vlp += dVlp;
117 Vhp += dVhp;
118 return (Vlp - Vhp) >> 11;
119}
120
121} // namespace reSIDfp
122
123#endif
124
125#endif
Definition ExternalFilter.h:65
void reset()
Definition ExternalFilter.cpp:61
void setClockFrequency(double frequency)
Definition ExternalFilter.cpp:48
ExternalFilter()
Definition ExternalFilter.cpp:41
int clock(unsigned short input)
Definition ExternalFilter.h:111