/usr/lib/lv2/decimator-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 | @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:decimator a :Plugin ;
a :DistortionPlugin ;
doap:name "Decimator" ;
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#decimator> ;
:port [
a :InputPort, :ControlPort ;
:name "Bit depth" ;
:index 0 ;
:symbol "bits" ;
:minimum 1 ;
:maximum 24 ;
:default 24 ;
] ;
:port [
a :InputPort, :ControlPort ;
:name "Sample rate (Hz)" ;
:index 1 ;
:symbol "fs" ;
:minimum 0.001 ;
:maximum 1 ;
:default 1 ;
:portProperty :sampleRate ;
] ;
:port [
a :InputPort, :AudioPort ;
:name "Input" ;
:index 2 ;
:symbol "input" ;
:minimum -1.0 ;
:maximum +1.0 ;
] ;
:port [
a :OutputPort, :AudioPort ;
:name "Output" ;
:index 3 ;
:symbol "output" ;
:minimum -1.0 ;
:maximum +1.0 ;
] ;
swhext:code """
#include <math.h>
#include "ladspa-util.h"
""" ;
swhext:callback [
swhext:event "instantiate" ;
swhext:code """
sample_rate = s_rate;
count = 0.0f;
last_out = 0.0f;
""" ;
] ;
swhext:callback [
swhext:event "run" ;
swhext:code """
unsigned long pos;
float step, stepr, delta, ratio;
double dummy;
if (bits >= 31.0f || bits < 1.0f) {
step = 0.0f;
stepr = 1.0f;
} else {
step = pow(0.5f, bits - 0.999f);
stepr = 1/step;
}
if (fs >= sample_rate) {
ratio = 1.0f;
} else {
ratio = fs/sample_rate;
}
for (pos = 0; pos < sample_count; pos++) {
count += ratio;
if (count >= 1.0f) {
count -= 1.0f;
delta = modf((input[pos] + (input[pos]<0?-1.0:1.0)*step*0.5) * stepr, &dummy) * step;
last_out = input[pos] - delta;
buffer_write(output[pos], last_out);
} else {
buffer_write(output[pos], last_out);
}
}
plugin_data->last_out = last_out;
plugin_data->count = count;
""" ;
] ;
swhext:createdBy <http://plugin.org.uk/swh-plugins/toTurtle.xsl> .
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