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tap_sigmoid.c

/*                                                     -*- linux-c -*-
    Copyright (C) 2004 Tom Szilagyi
    
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    $Id: tap_sigmoid.c,v 1.1 2004/08/02 18:14:50 tszilagyi Exp $
*/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "ladspa.h"
#include "tap_utils.h"


/* The Unique ID of the plugin: */

#define ID_MONO         2157

/* The port numbers for the plugin: */

#define PREGAIN         0
#define POSTGAIN        1
#define INPUT           2
#define OUTPUT          3

/* Total number of ports */


#define PORTCOUNT_MONO   4


/* The structure used to hold port connection information and state */

typedef struct {
      LADSPA_Data * pregain;
      LADSPA_Data * postgain;
      LADSPA_Data * input;
      LADSPA_Data * output;

      unsigned long sample_rate;
      LADSPA_Data run_adding_gain;
} Sigmoid;



/* Construct a new plugin instance. */
LADSPA_Handle 
instantiate_Sigmoid(const LADSPA_Descriptor * Descriptor,
                unsigned long             sample_rate) {
  
        LADSPA_Handle * ptr;
      
      if ((ptr = malloc(sizeof(Sigmoid))) != NULL) {
            ((Sigmoid *)ptr)->sample_rate = sample_rate;
            ((Sigmoid *)ptr)->run_adding_gain = 1.0f;

            return ptr;
      }
            return NULL;
}





/* Connect a port to a data location. */
void 
connect_port_Sigmoid(LADSPA_Handle Instance,
                   unsigned long Port,
                   LADSPA_Data * DataLocation) {
      
      Sigmoid * ptr = (Sigmoid *)Instance;

      switch (Port) {
      case PREGAIN:
            ptr->pregain = DataLocation;
            break;
      case POSTGAIN:
            ptr->postgain = DataLocation;
            break;
      case INPUT:
            ptr->input = DataLocation;
            break;
      case OUTPUT:
            ptr->output = DataLocation;
            break;
      }
}



void 
run_Sigmoid(LADSPA_Handle Instance,
          unsigned long SampleCount) {
  
      Sigmoid * ptr = (Sigmoid *)Instance;
      LADSPA_Data * input = ptr->input;
      LADSPA_Data * output = ptr->output;
      LADSPA_Data pregain = db2lin(LIMIT(*(ptr->pregain),-90.0f,20.0f));
      LADSPA_Data postgain = db2lin(LIMIT(*(ptr->postgain),-90.0f,20.0f));

      unsigned long sample_index;
      unsigned long sample_count = SampleCount;

      LADSPA_Data in = 0.0f;
      LADSPA_Data out = 0.0f;


      for (sample_index = 0; sample_index < sample_count; sample_index++) {

            in = *(input++) * pregain;
            
            out = 2.0f / (1.0f + exp(-5.0*in)) - 1.0f;

            *(output++) = out * postgain;
      }
}



void
set_run_adding_gain_Sigmoid(LADSPA_Handle Instance, LADSPA_Data gain) {

      Sigmoid * ptr = (Sigmoid *)Instance;

      ptr->run_adding_gain = gain;
}



void 
run_adding_Sigmoid(LADSPA_Handle Instance,
               unsigned long SampleCount) {
  
      Sigmoid * ptr = (Sigmoid *)Instance;
      LADSPA_Data * input = ptr->input;
      LADSPA_Data * output = ptr->output;
      LADSPA_Data pregain = db2lin(LIMIT(*(ptr->pregain),-90.0f,20.0f));
      LADSPA_Data postgain = db2lin(LIMIT(*(ptr->postgain),-90.0f,20.0f));

      unsigned long sample_index;
      unsigned long sample_count = SampleCount;

      LADSPA_Data in = 0.0f;
      LADSPA_Data out = 0.0f;


      for (sample_index = 0; sample_index < sample_count; sample_index++) {

            in = *(input++) * pregain;
            
            out = 2.0f / (1.0f + exp(-5.0*in)) - 1.0f;

            *(output++) += out * postgain * ptr->run_adding_gain;
      }
}




/* Throw away a Sigmoid effect instance. */
void 
cleanup_Sigmoid(LADSPA_Handle Instance) {

      free(Instance);
}



LADSPA_Descriptor * mono_descriptor = NULL;



/* _init() is called automatically when the plugin library is first
   loaded. */
void 
_init() {
      
      char ** port_names;
      LADSPA_PortDescriptor * port_descriptors;
      LADSPA_PortRangeHint * port_range_hints;
      
      if ((mono_descriptor = 
           (LADSPA_Descriptor *)malloc(sizeof(LADSPA_Descriptor))) == NULL)
            exit(1);
      

      mono_descriptor->UniqueID = ID_MONO;
      mono_descriptor->Label = strdup("tap_sigmoid");
      mono_descriptor->Properties = LADSPA_PROPERTY_HARD_RT_CAPABLE;
      mono_descriptor->Name = strdup("TAP Sigmoid Booster");
      mono_descriptor->Maker = strdup("Tom Szilagyi");
      mono_descriptor->Copyright = strdup("GPL");
      mono_descriptor->PortCount = PORTCOUNT_MONO;

      if ((port_descriptors =
           (LADSPA_PortDescriptor *)calloc(PORTCOUNT_MONO, sizeof(LADSPA_PortDescriptor))) == NULL)
            exit(1);

      mono_descriptor->PortDescriptors = (const LADSPA_PortDescriptor *)port_descriptors;
      port_descriptors[PREGAIN] = LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
      port_descriptors[POSTGAIN] = LADSPA_PORT_INPUT | LADSPA_PORT_CONTROL;
      port_descriptors[INPUT] = LADSPA_PORT_INPUT | LADSPA_PORT_AUDIO;
      port_descriptors[OUTPUT] = LADSPA_PORT_OUTPUT | LADSPA_PORT_AUDIO;

      if ((port_names = 
           (char **)calloc(PORTCOUNT_MONO, sizeof(char *))) == NULL)
            exit(1);

      mono_descriptor->PortNames = (const char **)port_names;
      port_names[PREGAIN] = strdup("Pre Gain [dB]");
      port_names[POSTGAIN] = strdup("Post Gain [dB]");
      port_names[INPUT] = strdup("Input");
      port_names[OUTPUT] = strdup("Output");

      if ((port_range_hints = 
           ((LADSPA_PortRangeHint *)calloc(PORTCOUNT_MONO, sizeof(LADSPA_PortRangeHint)))) == NULL)
            exit(1);

      mono_descriptor->PortRangeHints     = (const LADSPA_PortRangeHint *)port_range_hints;
      port_range_hints[PREGAIN].HintDescriptor = 
            (LADSPA_HINT_BOUNDED_BELOW |
             LADSPA_HINT_BOUNDED_ABOVE |
             LADSPA_HINT_DEFAULT_0);
      port_range_hints[POSTGAIN].HintDescriptor = 
            (LADSPA_HINT_BOUNDED_BELOW |
             LADSPA_HINT_BOUNDED_ABOVE |
             LADSPA_HINT_DEFAULT_0);
      port_range_hints[PREGAIN].LowerBound = -90.0f;
      port_range_hints[PREGAIN].UpperBound = 20.0f;
      port_range_hints[POSTGAIN].LowerBound = -90.0f;
      port_range_hints[POSTGAIN].UpperBound = 20.0f;
      port_range_hints[INPUT].HintDescriptor = 0;
      port_range_hints[OUTPUT].HintDescriptor = 0;
      mono_descriptor->instantiate = instantiate_Sigmoid;
      mono_descriptor->connect_port = connect_port_Sigmoid;
      mono_descriptor->activate = NULL;
      mono_descriptor->run = run_Sigmoid;
      mono_descriptor->run_adding = run_adding_Sigmoid;
      mono_descriptor->set_run_adding_gain = set_run_adding_gain_Sigmoid;
      mono_descriptor->deactivate = NULL;
      mono_descriptor->cleanup = cleanup_Sigmoid;
}


void
delete_descriptor(LADSPA_Descriptor * descriptor) {
      unsigned long index;
      if (descriptor) {
            free((char *)descriptor->Label);
            free((char *)descriptor->Name);
            free((char *)descriptor->Maker);
            free((char *)descriptor->Copyright);
            free((LADSPA_PortDescriptor *)descriptor->PortDescriptors);
            for (index = 0; index < descriptor->PortCount; index++)
                  free((char *)(descriptor->PortNames[index]));
            free((char **)descriptor->PortNames);
            free((LADSPA_PortRangeHint *)descriptor->PortRangeHints);
            free(descriptor);
      }
}


/* _fini() is called automatically when the library is unloaded. */
void
_fini() {
      delete_descriptor(mono_descriptor);
}


/* Return a descriptor of the requested plugin type. */
const LADSPA_Descriptor * 
ladspa_descriptor(unsigned long Index) {

      switch (Index) {
      case 0:
            return mono_descriptor;
      default:
            return NULL;
      }
}

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