<?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="zm1" id="1428" class="UtilityPlugin">
    <name>z-1</name>
    <p>A plugin that implements the $z^{-1}$ function (a single sample delay).</p>

    <callback event="instantiate"><![CDATA[
      xm1 = 0.0f;
    ]]></callback>

    <callback event="activate"><![CDATA[
      xm1 = 0.0f;
    ]]></callback>

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

      for (pos = 0; pos < sample_count; pos++) {
	tmp = input[pos];
        buffer_write(output[pos], xm1);
	xm1 = tmp;
      }
      plugin_data->xm1 = xm1;
    ]]></callback>

    <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="xm1" type="LADSPA_Data" />
  </plugin>
</ladspa>

