swh-lv2 1.0.16+git20160519~repack0-3 / usr / lib / lv2 / sc4-swh.lv2 / plugin.ttl

@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:sc4-main_in a pg:Group ;
   a pg:StereoGroup ;
   :symbol "main_in" .
  
swh:sc4-main_out a pg:Group ;
   a pg:StereoGroup ;
   :symbol "main_out" .
  
swh:sc4 a :Plugin ;
   a :CompressorPlugin ;

   doap:name "SC4" ;
   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#sc4> ;

   :pluginProperty :hardRtCapable ;
    
   :port [
     a :InputPort, :ControlPort ;
     :name "RMS/peak" ;
     :index 0 ;
     :symbol "rms_peak" ;
     :minimum 0 ;
     :maximum 1 ;
     
     :default 0 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Attack time (ms)" ;
     :index 1 ;
     :symbol "attack" ;
     :minimum 1.5 ;
     :maximum 400 ;
     
     :default 101.125 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Release time (ms)" ;
     :index 2 ;
     :symbol "release" ;
     :minimum 2 ;
     :maximum 800 ;
     
     :default 401 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Threshold level (dB)" ;
     :index 3 ;
     :symbol "threshold" ;
     :minimum -30 ;
     :maximum 0 ;
     
     :default 0 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Ratio (1:n)" ;
     :index 4 ;
     :symbol "ratio" ;
     :minimum 1 ;
     :maximum 20 ;
     
     :default 1.0 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Knee radius (dB)" ;
     :index 5 ;
     :symbol "knee" ;
     :minimum 1 ;
     :maximum 10 ;
     
     :default 3.25 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Makeup gain (dB)" ;
     :index 6 ;
     :symbol "makeup_gain" ;
     :minimum 0 ;
     :maximum +24 ;
     
     :default 0.0 ;
   ] ;
  
   :port [
     a :OutputPort, :ControlPort ;
     :name "Amplitude (dB)" ;
     :index 7 ;
     :symbol "amplitude" ;
     :minimum -40 ;
     :maximum +12 ;
     
   ] ;
  
   :port [
     a :OutputPort, :ControlPort ;
     :name "Gain reduction (dB)" ;
     :index 8 ;
     :symbol "gain_red" ;
     :minimum -24 ;
     :maximum 0 ;
     
   ] ;
  
   :port [
     a :InputPort, :AudioPort ;
     :name "Left input" ;
     :index 9 ;
     :symbol "left_in" ;
     pg:inGroup swh:sc4-main_in ;
     pg:role pg:leftChannel ;
   ] ;
  
   :port [
     a :InputPort, :AudioPort ;
     :name "Right input" ;
     :index 10 ;
     :symbol "right_in" ;
     pg:inGroup swh:sc4-main_in ;
     pg:role pg:rightChannel ;
   ] ;
  
   :port [
     a :OutputPort, :AudioPort ;
     :name "Left output" ;
     :index 11 ;
     :symbol "left_out" ;
     pg:inGroup swh:sc4-main_out ;
     pg:role pg:leftChannel ;
   ] ;
  
   :port [
     a :OutputPort, :AudioPort ;
     :name "Right output" ;
     :index 12 ;
     :symbol "right_out" ;
     pg:inGroup swh:sc4-main_out ;
     pg:role pg:rightChannel ;
   ] ;
  
   swhext:code """
      #include "util/db.h"
      #include "util/rms.h"

      #define A_TBL 256
    """ ;

   swhext:callback [
     swhext:event "instantiate" ;
     swhext:code """
      unsigned int i;
      float sample_rate = (float)s_rate;

      rms = rms_env_new();
      sum = 0.0f;
      amp = 0.0f;
      gain = 0.0f;
      gain_t = 0.0f;
      env = 0.0f;
      env_rms = 0.0f;
      env_peak = 0.0f;
      count = 0;

      as = malloc(A_TBL * sizeof(float));
      as[0] = 1.0f;
      for (i=1; i<A_TBL; i++) {
	as[i] = expf(-1.0f / (sample_rate * (float)i / (float)A_TBL));
      }

      db_init();
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "cleanup" ;
     swhext:code """
      rms_env_free(plugin_data->rms);
      free(plugin_data->as);
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "run" ;
     swhext:code """
      unsigned long pos;

      const float ga = attack < 2.0f ? 0.0f : as[f_round(attack * 0.001f * (float)(A_TBL-1))];
      const float gr = as[f_round(release * 0.001f * (float)(A_TBL-1))];
      const float rs = (ratio - 1.0f) / ratio;
      const float mug = db2lin(makeup_gain);
      const float knee_min = db2lin(threshold - knee);
      const float knee_max = db2lin(threshold + knee);
      const float ef_a = ga * 0.25f;
      const float ef_ai = 1.0f - ef_a;

      for (pos = 0; pos < sample_count; pos++) {
	const float la = fabs(left_in[pos]);
	const float ra = fabs(right_in[pos]);
	const float lev_in = f_max(la, ra);
        sum += lev_in * lev_in;

        if (amp > env_rms) {
          env_rms = env_rms * ga + amp * (1.0f - ga);
        } else {
          env_rms = env_rms * gr + amp * (1.0f - gr);
        }
	round_to_zero(&env_rms);
        if (lev_in > env_peak) {
          env_peak = env_peak * ga + lev_in * (1.0f - ga);
        } else {
          env_peak = env_peak * gr + lev_in * (1.0f - gr);
        }
	round_to_zero(&env_peak);
        if ((count++ & 3) == 3) {
          amp = rms_env_process(rms, sum * 0.25f);
          sum = 0.0f;
	  if (isnan(env_rms)) {
	    // This can happen sometimes, but I don't know why
	    env_rms = 0.0f;
	  }

          env = LIN_INTERP(rms_peak, env_rms, env_peak);

	  if (env <= knee_min) {
            gain_t = 1.0f;
	  } else if (env < knee_max) {
	    const float x = -(threshold - knee - lin2db(env)) / knee;
	    gain_t = db2lin(-knee * rs * x * x * 0.25f);
          } else {
            gain_t = db2lin((threshold - lin2db(env)) * rs);
          }
        }
        gain = gain * ef_a + gain_t * ef_ai;
        buffer_write(left_out[pos], left_in[pos] * gain * mug);
        buffer_write(right_out[pos], right_in[pos] * gain * mug);
      }
      plugin_data->sum = sum;
      plugin_data->amp = amp;
      plugin_data->gain = gain;
      plugin_data->gain_t = gain_t;
      plugin_data->env = env;
      plugin_data->env_rms = env_rms;
      plugin_data->env_peak = env_peak;
      plugin_data->count = count;

      *(plugin_data->amplitude) = lin2db(env);
      *(plugin_data->gain_red) = lin2db(gain);
    """ ;
   ] ;
  
   swhext:createdBy <http://plugin.org.uk/swh-plugins/toTurtle.xsl> .