ls_filter_1908.xml

<?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 &lt;steve@plugin.org.uk&gt;"/>
    <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>