swh-lv2 1.0.15+git20151104~repack0-1 / usr / lib / lv2 / flanger-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:flanger a :Plugin ;
   a :FlangerPlugin ;

   doap:name "Flanger" ;
   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#flanger> ;

   :pluginProperty :hardRtCapable ;
    
   :port [
     a :InputPort, :ControlPort ;
     :name "Delay base (ms)" ;
     :index 0 ;
     :symbol "delay_base" ;
     :minimum 0.1 ;
     :maximum 25 ;
     
     :default 6.325 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Max slowdown (ms)" ;
     :index 1 ;
     :symbol "detune" ;
     :minimum 0 ;
     :maximum 10 ;
     
     :default 2.5 ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "LFO frequency (Hz)" ;
     :index 2 ;
     :symbol "law_freq" ;
     :minimum 0.05 ;
     :maximum 100 ;
     
     :default 25.0375 ;
     :portProperty pprops:logarithmic ;
   ] ;
  
   :port [
     a :InputPort, :ControlPort ;
     :name "Feedback" ;
     :index 3 ;
     :symbol "feedback" ;
     :minimum -1 ;
     :maximum 1 ;
     
     :default 0.0 ;
   ] ;
  
   :port [
     a :InputPort, :AudioPort ;
     :name "Input" ;
     :index 4 ;
     :symbol "input" ;
   ] ;
  
   :port [
     a :OutputPort, :AudioPort ;
     :name "Output" ;
     :index 5 ;
     :symbol "output" ;
   ] ;
  
   swhext:code """
#include "ladspa-util.h"
    """ ;

   swhext:callback [
     swhext:event "instantiate" ;
     swhext:code """
int min_size;

sample_rate = s_rate;

prev_law_peak = 0.0f;
next_law_peak = 1.0f;
prev_law_pos = 0;
next_law_pos = 10;

min_size = sample_rate * 0.04f;
for (delay_size = 1024; delay_size < min_size; delay_size *= 2);
delay_tbl = malloc(sizeof(LADSPA_Data) * delay_size);
delay_pos = 0;
count = 0;
old_d_base = 0;
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "activate" ;
     swhext:code """
memset(delay_tbl, 0, sizeof(LADSPA_Data) * delay_size);
delay_pos = 0;
count = 0;
old_d_base = 0;
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "cleanup" ;
     swhext:code """
free(plugin_data->delay_tbl);
    """ ;
   ] ;
  
   swhext:callback [
     swhext:event "run" ;
     swhext:code """
unsigned long pos;
long d_base, new_d_base;
LADSPA_Data out;
float delay_depth;
float dp; // float delay position
float dp_frac; // fractional part
long dp_idx; // integer delay index
long law_p; // period of law
float frac = 0.0f, step; // Portion the way through the block
float law; /* law amplitude */
float n_ph, p_ph;
const float fb = f_clamp(feedback, -0.999f, 0.999f);

// Set law params
law_p = (float)sample_rate / law_freq;
if (law_p < 1) {
	law_p = 1;
}

// Calculate base delay size in samples
new_d_base = (LIMIT(f_round(delay_base), 0, 25) * sample_rate) / 1000;

// Calculate delay depth in samples
delay_depth = f_clamp(detune * (float)sample_rate * 0.001f, 0.0f, delay_size - new_d_base - 1.0f);

step = 1.0f/sample_count;
for (pos = 0; pos < sample_count; pos++) {
	if (count % law_p == 0) {
		// Value for amplitude of law peak
		next_law_peak = (float)rand() / (float)RAND_MAX;
		next_law_pos = count + law_p;
	} else if (count % law_p == law_p / 2) {
		// Value for amplitude of law peak
		prev_law_peak = (float)rand() / (float)RAND_MAX;
		prev_law_pos = count + law_p;
	}

	// Calculate position in delay table
	d_base = LIN_INTERP(frac, old_d_base, new_d_base);
	n_ph = (float)(law_p - abs(next_law_pos - count))/(float)law_p;
	p_ph = n_ph + 0.5f;
	while (p_ph > 1.0f) {
		p_ph -= 1.0f;
	}
	law = f_sin_sq(3.1415926f*p_ph)*prev_law_peak +
		f_sin_sq(3.1415926f*n_ph)*next_law_peak;

	dp = (float)(delay_pos - d_base) - (delay_depth * law);
	// Get the integer part
	dp_idx = f_round(dp - 0.5f);
	// Get the fractional part
	dp_frac = dp - dp_idx;

	// Accumulate into output buffer
	out = cube_interp(dp_frac, delay_tbl[(dp_idx-1) & (delay_size-1)], delay_tbl[dp_idx & (delay_size-1)], delay_tbl[(dp_idx+1) & (delay_size-1)], delay_tbl[(dp_idx+2) & (delay_size-1)]);

	// Store new delayed value
	delay_tbl[delay_pos] = flush_to_zero(input[pos] + (fb * out));
	// Sometimes the delay can pick up NaN values, I'm not sure why
	// and this is easier than fixing it
	if (isnan(delay_tbl[delay_pos])) {
		delay_tbl[delay_pos] = 0.0f;
	}

	out = f_clamp(delay_tbl[delay_pos] * 0.707f, -1.0, 1.0);
	buffer_write(output[pos], out);

	frac += step;
	delay_pos = (delay_pos + 1) & (delay_size-1);

	count++;
}

plugin_data->count = count;
plugin_data->prev_law_peak = prev_law_peak;
plugin_data->next_law_peak = next_law_peak;
plugin_data->prev_law_pos = prev_law_pos;
plugin_data->next_law_pos = next_law_pos;
plugin_data->delay_pos = delay_pos;
plugin_data->old_d_base = new_d_base;
    """ ;
   ] ;
  
   swhext:createdBy <http://plugin.org.uk/swh-plugins/toTurtle.xsl> .