inv_1429.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="inv" id="1429" class="UtilityPlugin">
    <name>Inverter</name>
    <p>A utility plugin that inverts the signal, also (wrongly) known as a 180 degree phase shift.</p>

    <callback event="run"><![CDATA[
      unsigned long pos;

      for (pos = 0; pos < sample_count; pos++) {
        buffer_write(output[pos], -input[pos]);
      }
    ]]></callback>

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

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