/usr/lib/lv2/svf-swh.lv2/plugin.ttl is in swh-lv2 1.0.15+git20151104~repack0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 | @prefix : <http://lv2plug.in/ns/lv2core#> .
@prefix swh: <http://plugin.org.uk/swh-plugins/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix swhext: <http://plugin.org.uk/extensions#> .
@prefix pg: <http://lv2plug.in/ns/ext/port-groups#> .
@prefix pprops: <http://lv2plug.in/ns/ext/port-props#> .
swh:svf a :Plugin ;
a :FilterPlugin ;
doap:name "State Variable Filter" ;
doap:maintainer [
foaf:name "Steve Harris";
foaf:homepage <http://plugin.org.uk/> ;
foaf:mbox <mailto:steve@plugin.org.uk> ;
] ;
doap:license <http://usefulinc.com/doap/licenses/gpl> ;
:documentation <http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#svf> ;
:pluginProperty :hardRtCapable ;
:port [
a :InputPort, :AudioPort ;
:name "Input" ;
:index 0 ;
:symbol "input" ;
:minimum -1 ;
:maximum 1 ;
] ;
:port [
a :OutputPort, :AudioPort ;
:name "Output" ;
:index 1 ;
:symbol "output" ;
:minimum -1 ;
:maximum 1 ;
] ;
:port [
a :InputPort, :ControlPort ;
:name "Filter type (0=none, 1=LP, 2=HP, 3=BP, 4=BR, 5=AP)" ;
:index 2 ;
:symbol "filt_type" ;
:minimum 0 ;
:maximum 5 ;
:default 0.0 ;
:portProperty :integer ;
] ;
:port [
a :InputPort, :ControlPort ;
:name "Filter freq" ;
:index 3 ;
:symbol "filt_freq" ;
:minimum 0 ;
:maximum 6000 ;
:default 440.0 ;
] ;
:port [
a :InputPort, :ControlPort ;
:name "Filter Q" ;
:index 4 ;
:symbol "filt_q" ;
:minimum 0 ;
:maximum 1 ;
:default 0.25 ;
] ;
:port [
a :InputPort, :ControlPort ;
:name "Filter resonance" ;
:index 5 ;
:symbol "filt_res" ;
:minimum 0 ;
:maximum 1 ;
:default 0.0 ;
] ;
swhext:code """
#include "ladspa-util.h"
// Constants to match filter types
#define F_LP 1
#define F_HP 2
#define F_BP 3
#define F_BR 4
#define F_AP 5
// Number of filter oversamples
#define F_R 3
/* Structure to hold parameters for SV filter */
typedef struct {
float f; // 2.0*sin(PI*fs/(fc*r));
float q; // 2.0*cos(pow(q, 0.1)*PI*0.5);
float qnrm; // sqrt(m/2.0f+0.01f);
float h; // high pass output
float b; // band pass output
float l; // low pass output
float p; // peaking output (allpass with resonance)
float n; // notch output
float *op; // pointer to output value
} sv_filter;
/* Store data in SVF struct, takes the sampling frequency, cutoff frequency
and Q, and fills in the structure passed */
static inline void setup_svf(sv_filter *sv, float fs, float fc, float q, int t) {
sv->f = 2.0f * sin(M_PI * fc / (float)(fs * F_R));
sv->q = 2.0f * cos(pow(q, 0.1f) * M_PI * 0.5f);
sv->qnrm = sqrt(sv->q/2.0+0.01);
switch(t) {
case F_LP:
sv->op = &(sv->l);
break;
case F_HP:
sv->op = &(sv->h);
break;
case F_BP:
sv->op = &(sv->b);
break;
case F_BR:
sv->op = &(sv->n);
break;
default:
sv->op = &(sv->p);
}
}
/* Run one sample through the SV filter. Filter is by andy@vellocet */
static inline float run_svf(sv_filter *sv, float in) {
float out;
int i;
in = sv->qnrm * in ;
for (i=0; i < F_R; i++) {
// only needed for pentium chips
in = flush_to_zero(in);
sv->l = flush_to_zero(sv->l);
// very slight waveshape for extra stability
sv->b = sv->b - sv->b * sv->b * sv->b * 0.001f;
// regular state variable code here
// the notch and peaking outputs are optional
sv->h = in - sv->l - sv->q * sv->b;
sv->b = sv->b + sv->f * sv->h;
sv->l = sv->l + sv->f * sv->b;
sv->n = sv->l + sv->h;
sv->p = sv->l - sv->h;
out = *(sv->op);
in = out;
}
return out;
}
""" ;
swhext:callback [
swhext:event "instantiate" ;
swhext:code """
sample_rate = s_rate;
svf = calloc(1, sizeof(sv_filter));
""" ;
] ;
swhext:callback [
swhext:event "activate" ;
swhext:code """
setup_svf(svf, 0, 0, 0, 0);
""" ;
] ;
swhext:callback [
swhext:event "cleanup" ;
swhext:code """
free(plugin_data->svf);
""" ;
] ;
swhext:callback [
swhext:event "run" ;
swhext:code """
long int pos;
setup_svf(svf, sample_rate, filt_freq, filt_q, f_round(filt_type));
for (pos = 0; pos < sample_count; pos++) {
buffer_write(output[pos], run_svf(svf, input[pos] + (svf->b * filt_res)));
}
""" ;
] ;
swhext:createdBy <http://plugin.org.uk/swh-plugins/toTurtle.xsl> .
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