1 /*
2   ZynAddSubFX - a software synthesizer
3 
4   Filter.h - Filters, uses analog,formant,etc. filters
5   Copyright (C) 2002-2005 Nasca Octavian Paul
6   Author: Nasca Octavian Paul
7 
8   This program is free software; you can redistribute it and/or
9   modify it under the terms of the GNU General Public License
10   as published by the Free Software Foundation; either version 2
11   of the License, or (at your option) any later version.
12 */
13 
14 #ifndef FILTER_H
15 #define FILTER_H
16 
17 #include "../globals.h"
18 
19 namespace zyn {
20 
21 class Filter
22 {
23     public:
24         static float getrealfreq(float freqpitch);
25         static Filter *generate(Allocator &memory, const FilterParams *pars,
26                 unsigned int srate, int bufsize);
27 
28         Filter(unsigned int srate, int bufsize);
~Filter()29         virtual ~Filter() {}
30         virtual void filterout(float *smp)    = 0;
31         virtual void setfreq(float frequency) = 0;
32         virtual void setfreq_and_q(float frequency, float q_) = 0;
33         virtual void setq(float q_) = 0;
34         virtual void setgain(float dBgain) = 0;
35 
36     protected:
37         float outgain;
38 
39         // current setup
40         unsigned int samplerate;
41         int buffersize;
42 
43         // alias for above terms
44         float samplerate_f;
45         float halfsamplerate_f;
46         float buffersize_f;
47         int   bufferbytes;
48 
alias()49         inline void alias()
50         {
51             samplerate_f     = samplerate;
52             halfsamplerate_f = samplerate_f / 2.0f;
53             buffersize_f     = buffersize;
54             bufferbytes      = buffersize * sizeof(float);
55         }
56 };
57 
58 }
59 
60 #endif
61