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<?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 <steve@plugin.org.uk>"/>
<meta name="copyright" value="GPL"/>
<meta name="properties" value="HARD_RT_CAPABLE"/>
</global>
<plugin label="const" id="1909" class="UtilityPlugin">
<name>Constant Signal Generator</name>
<p>This plugin add an output DC offset at the given amplitude to the input
signal. It has no real use other than for debugging and in modular synths.</p>
<callback event="activate"><![CDATA[
last_amp = 0.0f;
]]></callback>
<callback event="run"><![CDATA[
unsigned long pos;
const float delta = (amplitude - last_amp) / (sample_count - 1);
float amp = last_amp;
for (pos = 0; pos < sample_count; pos++) {
amp += delta;
buffer_write(output[pos], input[pos] + amp);
}
plugin_data->last_amp = amp;
]]></callback>
<port label="amplitude" dir="input" type="control" hint="default_0">
<name>Signal amplitude</name>
<p>Controls the amplitude of the output signal.</p>
<range min="-1" max="1.1"/>
</port>
<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="last_amp" type="float" />
</plugin>
</ladspa>
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