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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"/>
<meta name="properties" value="HARD_RT_CAPABLE"/>
<code>
#include "ladspa-util.h"
#include "util/ls_filter.h"
</code>
</global>
<plugin label="lsFilter" id="1908" class="FilterPlugin">
<name>LS Filter</name>
<p>This is a filter created for the LinkSampler project - its designed to closely follow the filter used in giga sampler.</p>
<callback event="instantiate"><![CDATA[
filt = malloc(sizeof(ls_filt));
fs = s_rate;
]]></callback>
<callback event="activate"><![CDATA[
ls_filt_init(filt);
]]></callback>
<callback event="run"><![CDATA[
unsigned long pos;
const ls_filt_type t = (ls_filt_type)f_round(type);
ls_filt_setup(filt, t, cutoff, resonance, fs);
for (pos = 0; pos < sample_count; pos++) {
buffer_write(output[pos], ls_filt_run(filt, input[pos]));
}
]]></callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->filt);
]]></callback>
<port label="type" dir="input" type="control" hint="default_0, integer">
<name>Filter type (0=LP, 1=BP, 2=HP)</name>
<p>The type of the filter, 0 for low pass, 1 for band pass, 2 for high pass.</p>
<range min="0" max="2"/>
</port>
<port label="cutoff" dir="input" type="control" hint="default_middle, logarithmic, sample_rate">
<name>Cutoff frequency (Hz)</name>
<p>Controls the frequency at which the filter starts to effect the audio signal.</p>
<p>eg. a lowpass filter with a cutoff frequency of 1000 Hz will only let frequencies below 1000 Hz through.</p>
<range min="0.002" max="0.5"/>
</port>
<port label="resonance" dir="input" type="control" hint="default_0">
<name>Resonance</name>
<p>Creates a peak at the cutoff frequency, for the classic overdriven filter sound. At high values the peak at the cutoff will overwhelm the filtered signal.</p>
<range min="0.0" max="1.0"/>
</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="fs" type="float" />
<instance-data label="filt" type="ls_filt *" />
</plugin>
</ladspa>
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