plugins/libdiff.c

   1 /* gAlan - Graphical Audio Language
   2  * Copyright (C) 1999 Tony Garnock-Jones
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <stddef.h>
  23
  24 #include <gdk/gdk.h>
  25 #include <gtk/gtk.h>
  26 #include <gmodule.h>
  27
  28 #include "global.h"
  29 #include "generator.h"
  30 #include "comp.h"
  31 #include "control.h"
  32 #include "gencomp.h"
  33
  34 #define GENERATOR_CLASS_NAME    "filter_diff"
  35 #define GENERATOR_CLASS_PATH    "Filter/Differentiator Coeffs"
  36
  37 #define EVT_TYPE                0
  38 #define NUM_EVENT_INPUTS        1
  39
  40 #define EVT_COEFFS              0
  41 #define NUM_EVENT_OUTPUTS       1
  42
  43 typedef struct Data {
  44 } Data;
  45
  46
  47
  48 #define NUM_COEFFS 4
  49
  50 /**
  51  * \brief Calculate the coefficients for a normal Integrator
  52  *        And emit them.
  53  *
  54  * \param g The Generator we send from.
  55  * \param event The event we received.
  56  *
  57  * The intgrator has its coefficients [1,1,1,0]
  58  *
  59  * That the event is passed here is only for convenience.
  60  * i change the type of the event from AE_NUMBER to AE_NUMARRAY
  61  * this makes eventq_free() believe it must free the number array also
  62  * so i change the type back to AE_NONE...
  63  *
  64  * This is to remove the segfault for now.
  65  * but i dont know how i should handle this in the future.
  66  */
  67
  68
  69 PRIVATE void calc_coeffs_and_send(Generator *g, AEvent *event) {
  70   gdouble coeffs[NUM_COEFFS] = { 1,0,1,-1 };
  71
  72   gen_init_aevent(event, AE_DBLARRAY, NULL, 0, NULL, 0, event->time);
  73
  74   event->d.darray.len = NUM_COEFFS;
  75   event->d.darray.numbers = coeffs;
  76
  77   gen_send_events(g, EVT_COEFFS, -1, event);
  78   event->kind = AE_NONE;
  79 }
  80
  81
  82 PRIVATE ControlDescriptor controls[] = {
  83   /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
  84        init,destroy,refresh,refresh_data }, */
  85 //  { CONTROL_KIND_KNOB, "bias", -1,1,0.1,0.01, 0,TRUE, TRUE,EVT_ADDEND,
  86 //    NULL,NULL, control_double_updater, (gpointer) offsetof(Data, addend) },
  87   { CONTROL_KIND_NONE, }
  88 };
  89
  90 PRIVATE void setup_class(void) {
  91   GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE,
  92                                              NUM_EVENT_INPUTS, NUM_EVENT_OUTPUTS,
  93                                              NULL, NULL, controls,
  94                                              NULL, NULL, NULL, NULL);
  95
  96   gen_configure_event_input(k, EVT_TYPE, "Type", calc_coeffs_and_send);
  97   gen_configure_event_output(k, EVT_COEFFS, "Coefficients");
  98
  99   gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH,
 100                                   NULL,
 101                                   NULL);
 102 }
 103
 104 PUBLIC void init_plugin(void) {
 105   setup_class();
 106 }