libsidplayfp  1.8.7
ExternalFilter.h
1 /*
2  * This file is part of libsidplayfp, a SID player engine.
3  *
4  * Copyright 2011-2013 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 
28 namespace reSIDfp
29 {
30 
48 {
49 private:
51  int Vlp;
52 
54  int Vhp;
55 
56  int w0lp_1_s7;
57 
58  int w0hp_1_s17;
59 
60 public:
66  int clock(int Vi);
67 
72 
78  void setClockFrequency(double frequency);
79 
83  void reset();
84 };
85 
86 } // namespace reSIDfp
87 
88 #if RESID_INLINING || defined(EXTERNALFILTER_CPP)
89 
90 namespace reSIDfp
91 {
92 
93 RESID_INLINE
95 {
96  const int dVlp = (w0lp_1_s7 * ((Vi << 11) - Vlp) >> 7);
97  const int dVhp = (w0hp_1_s17 * (Vlp - Vhp) >> 17);
98  Vlp += dVlp;
99  Vhp += dVhp;
100  return (Vlp - Vhp) >> 11;
101 }
102 
103 } // namespace reSIDfp
104 
105 #endif
106 
107 #endif
ExternalFilter()
Definition: ExternalFilter.cpp:30
Definition: Dac.cpp:25
Definition: ExternalFilter.h:47
void reset()
Definition: ExternalFilter.cpp:48
void setClockFrequency(double frequency)
Definition: ExternalFilter.cpp:39
int clock(int Vi)
Definition: ExternalFilter.h:94