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/usr/lib/lv2/latency-swh.lv2/plugin.ttl is in swh-lv2 1.0.15+git20151104~repack0-1.

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@prefix : <http://lv2plug.in/ns/lv2core#> .
@prefix swh: <http://plugin.org.uk/swh-plugins/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix doap: <http://usefulinc.com/ns/doap#> .
@prefix swhext: <http://plugin.org.uk/extensions#> .
@prefix pg: <http://lv2plug.in/ns/ext/port-groups#> .
@prefix pprops: <http://lv2plug.in/ns/ext/port-props#> .

swh:artificialLatency a :Plugin ;
   a :UtilityPlugin ;

   doap:name "Artificial latency" ;
   doap:maintainer [
      foaf:name "Steve Harris";
      foaf:homepage <http://plugin.org.uk/> ;
      foaf:mbox <mailto:steve@plugin.org.uk> ;
   ] ;
   doap:license <http://usefulinc.com/doap/licenses/gpl> ;
   :documentation <http://plugin.org.uk/ladspa-swh/docs/ladspa-swh.html#artificialLatency> ;

   :pluginProperty :hardRtCapable ;
    
   :port [
     a :InputPort, :ControlPort ;
     :name "Delay (ms)" ;
     :index 0 ;
     :symbol "delay" ;
     :minimum 0 ;
     :maximum 10000 ;
     
     :default 2500 ;
   ] ;
  
   :port [
     a :InputPort, :AudioPort ;
     :name "Input" ;
     :index 1 ;
     :symbol "input" ;
   ] ;
  
   :port [
     a :OutputPort, :AudioPort ;
     :name "Output" ;
     :index 2 ;
     :symbol "output" ;
   ] ;
  
   :port [
     a :OutputPort, :ControlPort ;
     :name "latency" ;
     :index 3 ;
     :symbol "latency" ;
     :portProperty :reportsLatency ;
   ] ;
  
   swhext:code """
      #include "ladspa-util.h"
    """ ;

   swhext:callback [
     swhext:event "instantiate" ;
     swhext:code """
      fs = s_rate;
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "run" ;
     swhext:code """
      unsigned long pos;
      const int delay_fr = f_round(delay * 0.001 * fs);

      if (input != output) {
        for (pos = 0; pos < sample_count; pos++) {
          buffer_write(output[pos], input[pos]);
        }
      }
      *(plugin_data->latency) = (float)delay_fr;
    """ ;
   ] ;
  
   swhext:createdBy <http://plugin.org.uk/swh-plugins/toTurtle.xsl> .