plugins/libsig2evt.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
  23 #include <gdk/gdk.h>
  24 #include <gtk/gtk.h>
  25
  26 #include "global.h"
  27 #include "generator.h"
  28 #include "comp.h"
  29 #include "control.h"
  30 #include "gencomp.h"
  31
  32 #define SIG_INPUT       0
  33 #define EVT_TRIGGER     0
  34 #define EVT_OUTPUT      0
  35
  36 PRIVATE void evt_trigger_handler(Generator *g, AEvent *event) {
  37   SAMPLE buffer;
  38   SAMPLETIME now = event->time;
  39
  40   if (!gen_read_realtime_input(g, SIG_INPUT, 0, &buffer, 1))
  41     buffer = 0;
  42
  43   gen_init_aevent(event, AE_NUMBER, NULL, 0, NULL, 0, now);
  44   event->d.number = buffer;
  45   gen_send_events(g, EVT_OUTPUT, -1, event);
  46 }
  47
  48 PRIVATE void handle_time(Generator *g, AEvent *event) {
  49   SAMPLE buf[MAXIMUM_REALTIME_STEP];
  50
  51   if (event->kind == AE_REALTIME)
  52     gen_read_realtime_input(g, SIG_INPUT, 0, buf, event->d.integer);
  53 }
  54
  55 PRIVATE gboolean init_instance(Generator *g) {
  56   gen_register_realtime_fn(g, handle_time);
  57   return TRUE;
  58 }
  59
  60 PRIVATE void done_instance(Generator *g) {
  61   gen_deregister_realtime_fn(g, handle_time);
  62 }
  63
  64 PRIVATE InputSignalDescriptor input_sigs[] = {
  65   { "Input", SIG_FLAG_REALTIME },
  66   { NULL, }
  67 };
  68
  69 PRIVATE void setup_class(void) {
  70   GeneratorClass *k = gen_new_generatorclass("sig2evt", FALSE, 1, 1,
  71                                              input_sigs, NULL, NULL,
  72                                              init_instance, done_instance,
  73                                              (AGenerator_pickle_t) init_instance, NULL);
  74
  75   gen_configure_event_input(k, EVT_TRIGGER, "Trigger", evt_trigger_handler);
  76   gen_configure_event_output(k, EVT_OUTPUT, "Output");
  77
  78   gencomp_register_generatorclass(k, FALSE, "Misc/Signal-to-event Converter", NULL, NULL);
  79 }
  80
  81 PUBLIC void init_plugin(void) {
  82   setup_class();
  83 }