libsidplayfp  1.2.2
SincResampler.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 SINCRESAMPLER_H
24 #define SINCRESAMPLER_H
25 
26 #include "Resampler.h"
27 
28 #include <string>
29 #include <map>
30 
31 #include "../array.h"
32 
33 namespace reSIDfp
34 {
35 
70 class SincResampler : public Resampler
71 {
72 private:
73  typedef std::map<std::string, matrix_t> fir_cache_t;
74 
75 private:
76  static const int RINGSIZE = 2048;
77 
78  static const int BITS = 16;
79 
80  matrix_t* firTable;
81 
82  int sampleIndex;
83 
84  int firRES, firN;
85 
86  const int cyclesPerSample;
87 
88  int sampleOffset;
89 
90  int outputValue;
91 
92  short sample[RINGSIZE * 2];
93 
97  static fir_cache_t FIR_CACHE;
98 
100  static const double I0E;
101 
110  static double I0(double x);
111 
120  static int convolve(const short* a, const short* b, int bLength);
121 
122  int fir(int subcycle);
123 
124 public:
145  SincResampler(double clockFrequency, double samplingFrequency, double highestAccurateFrequency);
146 
147  bool input(int input);
148 
149  int output() const { return outputValue; }
150 
151  void reset();
152 };
153 
154 } // namespace reSIDfp
155 
156 #endif
Definition: SincResampler.h:70
Definition: array.h:41
bool input(int input)
Definition: SincResampler.cpp:210
Definition: Resampler.h:34
SincResampler(double clockFrequency, double samplingFrequency, double highestAccurateFrequency)
Definition: SincResampler.cpp:122