hard_limiter_1413.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="Marcus Andersson"/>
    <meta name="copyright" value="GPL"/>
    <meta name="properties" value="HARD_RT_CAPABLE"/>
    <code><![CDATA[
      #include <math.h>
      #include "ladspa-util.h"
    ]]></code>
  </global>

  <plugin label="hardLimiter" id="1413" class="LimiterPlugin,DistortionPlugin">
    <name>Hard Limiter</name>
    <p>Brick hard limiter with residue mixer.</p>

    <callback event="run"><![CDATA[
	unsigned long i;
	for (i = 0; i < sample_count; i++)
	{
		float limit_g = pow(10, limit_db / 20);
		float sign = input[i] < 0.0 ? -1.0 : 1.0;
		float data = input[i] * sign;
		float residue = data > limit_g ? data - limit_g : 0.0;
		data -= residue;
		buffer_write(output[i],
			 sign * (wet_gain * data + res_gain * residue));
	}
    ]]></callback>

    <port label="limit_db" dir="input" type="control" hint="default_0">
      <name>dB limit</name>
      <p></p>
      <range min="-50.0" max="0.0"/>
    </port>

    <port label="wet_gain" dir="input" type="control" hint="default_1">
      <name>Wet level</name>
      <p>Output level for limited signal.</p>
      <range min="0.0" max="1.0"/>
    </port>

    <port label="res_gain" dir="input" type="control" hint="default_0">
      <name>Residue level</name>
      <p>Output level for residue 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>

  </plugin>
</ladspa>