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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"/>
<code>
#include "ladspa-util.h"
</code>
</global>
<plugin label="modDelay" id="1419" class="DelayPlugin">
<name>Modulatable delay</name>
<p>A delay whose tap can be modulated at audio rate.</p>
<p>Requested by Matthias Nagorni at LinuxTag 2002, in order to make a Leslie simulator.</p>
<callback event="instantiate"><![CDATA[
unsigned int size = 32768;
fs = s_rate;
while (size < 2.7f * fs) {
size *= 2;
}
buffer = calloc(size, sizeof(LADSPA_Data));
buffer_mask = size - 1;
write_ptr = 0;
]]></callback>
<callback event="activate"><![CDATA[
memset(buffer, 0, buffer_mask + 1);
write_ptr = 0;
]]></callback>
<callback event="cleanup"><![CDATA[
free(plugin_data->buffer);
]]></callback>
<callback event="run"><![CDATA[
unsigned long pos;
for (pos = 0; pos < sample_count; pos++) {
float tmp;
const float rpf = modff((base + delay[pos]) * fs, &tmp);
const int rp = write_ptr - 4 - f_round(tmp);
buffer[write_ptr++] = input[pos];
write_ptr &= buffer_mask;
buffer_write(output[pos], cube_interp(rpf, buffer[(rp - 1) & buffer_mask], buffer[rp & buffer_mask], buffer[(rp + 1) & buffer_mask], buffer[(rp + 2) & buffer_mask]));
}
plugin_data->write_ptr = write_ptr;
]]></callback>
<port label="base" dir="input" type="control" hint="default_maximum">
<name>Base delay (s)</name>
<range min="0" max="1"/>
</port>
<port label="delay" dir="input" type="audio" hint="default_0">
<name>Delay (s)</name>
<range min="0" max="1.7"/>
</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="fs" type="float" />
<instance-data label="buffer" type="LADSPA_Data *" />
<instance-data label="buffer_mask" type="unsigned int" />
<instance-data label="write_ptr" type="unsigned int" />
</plugin>
</ladspa>
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