libsidplayfp  1.5.3
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 
46 {
47 private:
49  int Vlp;
50 
52  int Vhp;
53 
54  int w0lp_1_s7;
55 
56  int w0hp_1_s17;
57 
58 public:
64  int clock(int Vi);
65 
70 
76  void setClockFrequency(double frequency);
77 
81  void reset();
82 };
83 
84 } // namespace reSIDfp
85 
86 #if RESID_INLINING || defined(EXTERNALFILTER_CPP)
87 
88 namespace reSIDfp
89 {
90 
91 RESID_INLINE
93 {
94  const int dVlp = (w0lp_1_s7 * ((Vi << 11) - Vlp) >> 7);
95  const int dVhp = (w0hp_1_s17 * (Vlp - Vhp) >> 17);
96  Vlp += dVlp;
97  Vhp += dVhp;
98  return (Vlp - Vhp) >> 11;
99 }
100 
101 } // namespace reSIDfp
102 
103 #endif
104 
105 #endif
ExternalFilter()
Definition: ExternalFilter.cpp:30
Definition: ExternalFilter.h:45
void reset()
Definition: ExternalFilter.cpp:47
void setClockFrequency(double frequency)
Definition: ExternalFilter.cpp:39
int clock(int Vi)
Definition: ExternalFilter.h:92