forked from nervousapps/AudioSynthBraids
/
svf.h
120 lines (100 loc) · 3 KB
/
svf.h
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
// Copyright 2013 Emilie Gillet.
//
// Author: Emilie Gillet (emilie.o.gillet@gmail.com)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//
// See http://creativecommons.org/licenses/MIT/ for more information.
//
// -----------------------------------------------------------------------------
//
// SVF used for modeling the bridged T-networks.
#ifndef BRAIDS_SVF_H_
#define BRAIDS_SVF_H_
#include <stmlib.h>
#include "resources.h"
#include <dsp.h>
namespace braids {
enum SvfMode {
SVF_MODE_LP,
SVF_MODE_BP,
SVF_MODE_HP
};
class Svf {
public:
Svf() { }
~Svf() { }
void Init() {
lp_ = 0;
bp_ = 0;
frequency_ = 33 << 7;
resonance_ = 16384;
dirty_ = true;
punch_ = 0;
mode_ = SVF_MODE_BP;
}
void set_frequency(int16_t frequency) {
dirty_ = dirty_ || (frequency_ != frequency);
frequency_ = frequency;
}
void set_resonance(int16_t resonance) {
resonance_ = resonance;
dirty_ = true;
}
void set_punch(uint16_t punch) {
punch_ = (static_cast<uint32_t>(punch) * punch) >> 24;
}
void set_mode(SvfMode mode) {
mode_ = mode;
}
inline int32_t Process(int32_t in) {
if (dirty_) {
f_ = stmlib::Interpolate824(lut_svf_cutoff, frequency_ << 17);
damp_ = stmlib::Interpolate824(lut_svf_damp, resonance_ << 17);
dirty_ = false;
}
int32_t f = f_;
int32_t damp = damp_;
if (punch_) {
int32_t punch_signal = lp_ > 4096 ? lp_ : 2048;
f += ((punch_signal >> 4) * punch_) >> 9;
damp += ((punch_signal - 2048) >> 3);
}
int32_t notch = in - (bp_ * damp >> 15);
lp_ += f * bp_ >> 15;
CLIP(lp_)
int32_t hp = notch - lp_;
bp_ += f * hp >> 15;
CLIP(bp_)
return mode_ == SVF_MODE_BP ? bp_ : (mode_ == SVF_MODE_HP ? hp : lp_);
}
private:
bool dirty_;
int16_t frequency_;
int16_t resonance_;
int32_t punch_;
int32_t f_;
int32_t damp_;
int32_t lp_;
int32_t bp_;
SvfMode mode_;
DISALLOW_COPY_AND_ASSIGN(Svf);
};
} // namespace braids
#endif // BRAIDS_SVF_H_