declip_1195.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>
			#define MAX_AMP 1.0f
			#define CLIP 0.8f
			#define CLIP_A ((MAX_AMP - CLIP) * (MAX_AMP - CLIP))
			#define CLIP_B (MAX_AMP - 2.0f * CLIP)
		</code>
	</global>

	<plugin label="declip" id="1195" class="WaveshaperPlugin">
		<name>Declipper</name>
		<p>Removes nasty clicks from input signals, not very kind to them though.</p>
		<p>This code came from the music-dsp mailing list, but it was unattributed, if it's yours, please drop me a line and I'll credit you.</p>

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

			for (pos = 0; pos < sample_count; pos++) {
				const LADSPA_Data in = input[pos];

				if((in < CLIP) && (in > -CLIP)) {
					buffer_write(output[pos], in);
				} else if (in > 0.0f) {
					buffer_write(output[pos], MAX_AMP - (CLIP_A / (CLIP_B + in)));
				} else {
					buffer_write(output[pos], -(MAX_AMP - (CLIP_A / (CLIP_B - in))));
				}
			}
		]]></callback>

		<port label="input" dir="input" type="audio">
			<name>Input</name>
			<range min="-1" max="+1"/>
		</port>

		<port label="output" dir="output" type="audio">
			<name>Output</name>
			<range min="-1" max="+1"/>
		</port>
	</plugin>
</ladspa>