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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="Alexander Ehlert <mag@glame.de>"/>
<meta name="copyright" value="GPL"/>
<meta name="properties" value="HARD_RT_CAPABLE"/>
<code>
#include "config.h"
#include "util/iir.h"
</code>
</global>
<plugin label="highpass_iir" id="1890" class="HighpassPlugin">
<name>Glame Highpass Filter</name>
<p> IIR highpass filter based using chebishev coefficients. The filter allows you to tweak the number of stages used for
filtering. Every stage adds two more poles, which leads to a steeper dropoff. More stages need more CPU power. This
filter was ported from the glame multitrack editor to ladspa.
</p>
<callback event="instantiate">
sample_rate = s_rate;
</callback>
<callback event="run">
chebyshev(iirf, gt, 2*CLAMP((int)stages,1,10), IIR_STAGE_HIGHPASS, cutoff/(float)sample_rate, 0.5f);
iir_process_buffer_ns_5(iirf, gt, input, output, sample_count,RUN_ADDING);
// Unused variable
(void)(run_adding_gain);
</callback>
<callback event="activate">
gt = init_iir_stage(IIR_STAGE_HIGHPASS,10,3,2);
iirf = init_iirf_t(gt);
chebyshev(iirf, gt, 2*CLAMP((int)(*(plugin_data->stages)),1,10), IIR_STAGE_HIGHPASS, *(plugin_data->cutoff)/(float)sample_rate, 0.5f);
</callback>
<callback event="cleanup">
free_iirf_t(plugin_data->iirf, plugin_data->gt);
free_iir_stage(plugin_data->gt);
</callback>
<port label="cutoff" dir="input" type="control" hint="default_low, sample_rate, logarithmic">
<name>Cutoff Frequency</name>
<range min="0.0001" max="0.45"/>
</port>
<port label="stages" dir="input" type="control" hint="default_1, integer">
<name>Stages(2 poles per stage)</name>
<range min="1.0" max="10.0"/>
</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="iirf" type="iirf_t*"/>
<instance-data label="gt" type="iir_stage_t*"/>
<instance-data label="sample_rate" type="long"/>
</plugin>
</ladspa>
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