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<?xml version="1.0"?>
<!DOCTYPE ladspa SYSTEM "ladspa-swh.dtd">
<?xml-stylesheet href="ladspa.css" type="text/css"?>
<ladspa>
<global>
<meta name="maker" value="Steve Harris <steve@plugin.org.uk>"/>
<meta name="copyright" value="GPL"/>
<code><![CDATA[
#include "ladspa-util.h"
#define MAX_BSIZE 1000
inline int partition(LADSPA_Data array[], int left, int right);
void q_sort(LADSPA_Data array[], int left, int right) {
float pivot = partition(array, left, right);
if (left < pivot) {
q_sort(array, left, pivot-1);
}
if (right > pivot) {
q_sort(array, pivot+1, right);
}
}
inline int partition(LADSPA_Data array[], int left, int right) {
float pivot = array[left];
while (left < right) {
while (array[right] >= pivot && left < right) {
right--;
}
if (left != right) {
array[left] = array[right];
left++;
}
while (array[left] <= pivot && left < right) {
left++;
}
if (left != right) {
array[right] = array[left];
right--;
}
}
array[left] = pivot;
return left;
}
]]></code>
</global>
<plugin label="sifter" id="1210" class="TimePlugin,DistortionPlugin">
<name>Signal sifter</name>
<p>Sorts and mixes blocks of the input signal to give a "bumpy ramp" effect.</p>
<p>Certain types of input will produce silence on the output (mostly ones with only low frequency components).</p>
<p>This is a very odd effect, and doesn't really have any music applications, but can produce some interesting noises.</p>
<callback event="instantiate"><![CDATA[
long i;
float scla = (float)MAX_BSIZE * 0.5f;
float sclb = (float)MAX_BSIZE;
b1 = (LADSPA_Data *)calloc(MAX_BSIZE, sizeof(LADSPA_Data));
b2 = (LADSPA_Data *)calloc(MAX_BSIZE, sizeof(LADSPA_Data));
ob = (LADSPA_Data *)calloc(MAX_BSIZE, sizeof(LADSPA_Data));
rc = (LADSPA_Data *)calloc(MAX_BSIZE, sizeof(LADSPA_Data));
// Calculate raised cosine table, to build windowing function from
rc[0] = cos(((0.0f - scla) / sclb) * M_PI);
rc[0] *= rc[0];
for (i=1; i<MAX_BSIZE / 2; i++) {
rc[i] = cos((((float)i - scla) / sclb) * M_PI);
rc[i] *= rc[i];
rc[MAX_BSIZE - i] = rc[i];
}
rc[MAX_BSIZE / 2] = 1.0f;
b1ptr = 0;
b2ptr = 0;
]]></callback>
<callback event="activate"><![CDATA[
b1ptr = 0;
b2ptr = 0;
memset(b1, 0, MAX_BSIZE * sizeof(LADSPA_Data));
memset(b2, 0, MAX_BSIZE * sizeof(LADSPA_Data));
memset(ob, 0, MAX_BSIZE * sizeof(LADSPA_Data));
]]></callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->b1);
free(plugin_data->b2);
free(plugin_data->ob);
free(plugin_data->rc);
]]></callback>
<callback event="run"><![CDATA[
unsigned long pos, i;
long bsize = f_round(LIMIT(size, 1, MAX_BSIZE));
for (pos = 0; pos < sample_count; pos++) {
if (b1ptr >= bsize) {
float wstep = (float)MAX_BSIZE / (float)b1ptr, wpos = 0.0f;
q_sort(b1, 0, b1ptr);
for (i=0; i<b1ptr; i++) {
ob[i] += b1[i] * rc[f_round(wpos)];
wpos += wstep;
}
b1ptr = 0;
b2ptr = (bsize+1) / 2;
}
if (b2ptr >= bsize) {
float wstep = (float)MAX_BSIZE / (float)b2ptr, wpos = 0.0f;
int offset = (b2ptr+1)/2;
q_sort(b2, 0, b2ptr);
for (i=0; i<offset; i++) {
ob[i + offset] += b2[i] * rc[f_round(wpos)];
wpos += wstep;
}
for (; i<b2ptr; i++) {
ob[i - offset] += b2[i] * rc[f_round(wpos)];
wpos += wstep;
}
b2ptr = 0;
}
if (bsize < 2) {
ob[b1ptr] = input[pos];
}
b1[b1ptr] = input[pos];
b2[b2ptr] = input[pos];
buffer_write(output[pos], ob[b1ptr]);
ob[b1ptr] = 0.0f;
b1ptr++;
b2ptr++;
}
plugin_data->b1ptr = b1ptr;
plugin_data->b2ptr = b2ptr;
]]></callback>
<port label="size" dir="input" type="control" hint="default_1">
<name>Sift size</name>
<range min="1" max="MAX_BSIZE"/>
</port>
<port label="input" dir="input" type="audio">
<name>Input</name>
</port>
<port label="output" dir="output" type="audio">
<name>Output</name>
</port>
<instance-data label="b1ptr" type="long"/>
<instance-data label="b2ptr" type="long"/>
<instance-data label="b1" type="LADSPA_Data *"/>
<instance-data label="b2" type="LADSPA_Data *"/>
<instance-data label="ob" type="LADSPA_Data *"/>
<instance-data label="rc" type="LADSPA_Data *"/>
</plugin>
</ladspa>
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