plugins/librart.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 POLYPHONY       4
  35
  36 typedef struct Data {
  37   SAMPLETIME location[POLYPHONY];
  38   int num_playing;
  39 } Data;
  40
  41 #define LOCATION(g)     ((SAMPLETIME) ((g)->data))
  42
  43 PRIVATE gboolean init_instance(Generator *g) {
  44   Data *data = safe_malloc(sizeof(Data));
  45
  46   data->num_playing = 0;
  47   /* location[] doesn't need initialising because num_playing is zero. */
  48
  49   g->data = data;
  50   return TRUE;
  51 }
  52
  53 PRIVATE void done_instance(Generator *g) {
  54   free(g->data);
  55 }
  56
  57 PRIVATE gboolean output_generator(Generator *g, SAMPLE *buf, int buflen) {
  58   Data *data = g->data;
  59   SAMPLE tmpbuf[MAXIMUM_REALTIME_STEP];
  60   SAMPLETIME range;
  61   int i;
  62
  63   if (data->num_playing == 0)
  64     return FALSE;
  65
  66   memset(buf, 0, sizeof(SAMPLE) * buflen);
  67   range = gen_get_randomaccess_input_range(g, 0, 0);
  68
  69   i = 0;
  70   while (i < data->num_playing) {
  71     if (gen_read_randomaccess_input(g, 0, 0, data->location[i], tmpbuf, buflen)) {
  72       int j;
  73       for (j = 0; j < buflen; j++)
  74         buf[j] += tmpbuf[j];
  75     }
  76
  77     data->location[i] += buflen;
  78
  79     if (data->location[i] >= range) {
  80       data->num_playing--;
  81       data->location[i] = data->location[data->num_playing];
  82     } else {
  83       i++;
  84     }
  85   }
  86
  87   return TRUE;
  88 }
  89
  90 PRIVATE void evt_reset_handler(Generator *g, AEvent *event) {
  91   Data *data = g->data;
  92
  93   if (data->num_playing >= POLYPHONY) {
  94     int i;
  95
  96     for (i = 0; i < POLYPHONY - 1; i++) {
  97       data->location[i] = data->location[i+1];
  98     }
  99
 100     data->location[POLYPHONY - 1] = 0;
 101   } else {
 102     data->location[data->num_playing++] = 0;
 103   }
 104 }
 105
 106 PRIVATE InputSignalDescriptor input_sigs[] = {
 107   { "Input", SIG_FLAG_RANDOMACCESS },
 108   { NULL, }
 109 };
 110
 111 PRIVATE OutputSignalDescriptor output_sigs[] = {
 112   { "Output", SIG_FLAG_REALTIME, { output_generator, } },
 113   { NULL, }
 114 };
 115
 116 PRIVATE ControlDescriptor controls[] = {
 117   /* { kind, name, min,max,step,page, size,editable, is_dst,queue_number,
 118        init,destroy,refresh,refresh_data }, */
 119   { CONTROL_KIND_NONE, }
 120 };
 121
 122 PRIVATE void setup_class(void) {
 123   GeneratorClass *k = gen_new_generatorclass("rart", FALSE, 1, 0,
 124                                              input_sigs, output_sigs, controls,
 125                                              init_instance, done_instance,
 126                                              (AGenerator_pickle_t) init_instance, NULL);
 127
 128   gen_configure_event_input(k, 0, "Reset", evt_reset_handler);
 129
 130   gencomp_register_generatorclass(k, FALSE, "Misc/Randomaccess to Realtime Converter", NULL, NULL);
 131 }
 132
 133 PUBLIC void init_plugin(void) {
 134   setup_class();
 135 }