plugins/libvca.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 GENERATOR_CLASS_NAME    "vca"
  33 #define GENERATOR_CLASS_PATH    "Levels/Envelope Gain"
  34
  35 #define SIG_ENVELOPE            0
  36 #define SIG_INPUT               1
  37
  38 #define SIG_OUTPUT              0
  39
  40 PRIVATE gboolean output_generator(Generator *g, SAMPLE *buf, int buflen) {
  41   SAMPLE tmpbuf[MAXIMUM_REALTIME_STEP];
  42   int i;
  43
  44   if (!gen_read_realtime_input(g, SIG_ENVELOPE, -1, tmpbuf, buflen) ||
  45       !gen_read_realtime_input(g, SIG_INPUT, -1, buf, buflen))
  46     return FALSE;
  47
  48   for (i = 0; i < buflen; i++)
  49     buf[i] *= tmpbuf[i];
  50   return TRUE;
  51 }
  52
  53 PRIVATE InputSignalDescriptor input_sigs[] = {
  54   { "Envelope", SIG_FLAG_REALTIME },
  55   { "Input", SIG_FLAG_REALTIME },
  56   { NULL, }
  57 };
  58
  59 PRIVATE OutputSignalDescriptor output_sigs[] = {
  60   { "Output", SIG_FLAG_REALTIME, { output_generator, } },
  61   { NULL, }
  62 };
  63
  64 PRIVATE void setup_class(void) {
  65   GeneratorClass *k = gen_new_generatorclass(GENERATOR_CLASS_NAME, FALSE, 0, 0,
  66                                              input_sigs, output_sigs, NULL,
  67                                              NULL, NULL, NULL, NULL);
  68
  69   gencomp_register_generatorclass(k, FALSE, GENERATOR_CLASS_PATH, NULL, NULL);
  70 }
  71
  72 PUBLIC void init_plugin(void) {
  73   setup_class();
  74 }