alias_1407.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"/>
  </global>

  <plugin label="alias" id="1407" class="DistortionPlugin">
    <name>Aliasing</name>
    <p>Simulates aliasing using nyquist frequency modulation. Produces wacky results if the blocks aren't even numbers of samples long.</p>

    <callback event="run"><![CDATA[
      unsigned long pos;
      float coef = 1.0f - 2.0f * level;

      if (output != input) {
        for (pos = 0; pos < sample_count; pos+=2) {
          buffer_write(output[pos], input[pos]);
        }
      }
      for (pos = 1; pos < sample_count; pos+=2) {
        buffer_write(output[pos], input[pos] * coef);
      }
    ]]></callback>

    <port label="level" dir="input" type="control" hint="default_0">
      <name>Aliasing level</name>
      <p>Controls the amount of simulated aliasing in the output.</p>
      <range min="0" max="1"/>
    </port>

    <port label="input" dir="input" type="audio">
      <name>Input</name>
    </port>

    <port label="output" dir="output" type="audio">
      <name>Output</name>
    </port>
  </plugin>
</ladspa>