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plugin.c

/*
 *  Copyright (C) 2003 Steve Harris
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  $Id: plugin.c,v 1.3 2003/11/19 15:28:17 theno23 Exp $
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>

#include "ladspa.h"
#include "plugin.h"

static char *plugin_path;

void plugin_init()
{
      if (getenv("LADSPA_PATH")) {
            plugin_path = getenv("LADSPA_PATH");
      } else {
            plugin_path = "/usr/local/lib/ladspa:/usr/lib/ladspa";
      }
}

plugin *plugin_load(char *file)
{
      char *dir;
      char *path_tok;
      char path[512];
      void *dl;

      path_tok = strdup(plugin_path);
      for (dir = strtok(path_tok, ":"); dir; dir = strtok(NULL, ":")) {
            snprintf(path, 511, "%s/%s", dir, file);
            if ((dl = dlopen(path, RTLD_LAZY))) {
                  plugin *ret = malloc(sizeof(plugin));
                  LADSPA_Descriptor *(*d)(unsigned long);

                  ret->dl = dl;
                  d = dlsym(dl, "ladspa_descriptor");
                  ret->descriptor = (*d)(0);

                  return ret;
            }
      }
      fprintf(stderr, "Cannot find plugin '%s'\n", file);
      free(path_tok);

      return NULL;
}

LADSPA_Handle plugin_instantiate(plugin *p, unsigned long fs)
{
      if (p->descriptor->instantiate) {
            return (*p->descriptor->instantiate)(p->descriptor, fs);
      } else {
             fprintf(stderr, "Cannot find instantiate function for %s\n", p->descriptor->Label);
      }

      return NULL;
}

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