plugins/libevtdelay.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
  27 #include "global.h"
  28 #include "generator.h"
  29 #include "comp.h"
  30 #include "control.h"
  31 #include "gencomp.h"
  32 #include "msgbox.h"
  33
  34 #define GENERATOR_CLASS_NAME    "evtdelay"
  35 #define GENERATOR_CLASS_PATH    "Events/Delay"
  36
  37 #define EVT_INPUT 0
  38 #define EVT_DELAY 1
  39 #define EVT_OUTPUT 0
  40
  41 typedef struct Data {
  42     gdouble delay_sec;
  43     SAMPLETIME delay;
  44 } Data;
  45
  46 PRIVATE int init_instance(Generator *g) {
  47
  48   Data *data = safe_malloc( sizeof( Data ) );
  49   data->delay_sec = 0.0;
  50   data->delay = 0;
  51   g->data = data;
  52
  53   return 1;
  54 }
  55
  56 PRIVATE void destroy_instance(Generator *g) {
  57
  58     free( g->data );
  59 }
  60
  61 PRIVATE void unpickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  62
  63   Data *data = safe_malloc(sizeof(Data));
  64   g->data = data;
  65
  66   data->delay_sec = objectstore_item_get_double(item, "delay_sec", 0);
  67   data->delay = data->delay_sec * SAMPLE_RATE;
  68 }
  69
  70 PRIVATE void pickle_instance(Generator *g, ObjectStoreItem *item, ObjectStore *db) {
  71
  72   Data *data = g->data;
  73   objectstore_item_set_double(item, "delay_sec", data->delay_sec);
  74 }
  75
  76 PRIVATE void evt_input_handler(Generator *g, AEvent *event) {
  77
  78   Data *data = g->data;
  79
  80   event->time += data->delay;
  81   gen_send_events(g, EVT_OUTPUT, -1, event);
  82 }
  83
  84
  85 PRIVATE void evt_delay_handler(Generator *g, AEvent *event) {
  86
  87   Data *data = g->data;
  88
  89   data->delay_sec = event->d.number;
  90   data->delay = data->delay_sec * SAMPLE_RATE;
  91 }
  92
  93 PRIVATE ControlDescriptor controls[] = {
  94   { CONTROL_KIND_NONE, }
  95 };
  96
  97
  98
  99 PRIVATE void setup_class(void) {
 100   GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE, 2, 1,
 101                                              NULL, NULL, controls,
 102                                              init_instance, destroy_instance,
 103                                              unpickle_instance, pickle_instance);
 104
 105   gen_configure_event_input(k, EVT_INPUT, "Input", evt_input_handler);
 106   gen_configure_event_input(k, EVT_DELAY, "Delay", evt_delay_handler);
 107   gen_configure_event_output(k, EVT_OUTPUT, "Output");
 108
 109   gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
 110 }
 111
 112 PUBLIC void init_plugin(void) {
 113   setup_class();
 114 }