/*
 *  decode_a52.c
 *
 *  Copyright (C) Thomas Östreich - June 2001
 *
 *  This file is part of transcode, a video stream processing tool
 *      
 *  transcode 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, or (at your option)
 *  any later version.
 *   
 *  transcode 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.
 *   
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#include "transcode.h"

#include <sys/errno.h>

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#else
# ifdef SYSTEM_DARWIN
#  include "libdldarwin/dlfcn.h"
# endif
#endif

#include "ioaux.h"

static char *mod_path=MOD_PATH;

#define MODULE "a52_decore.so"

// dl stuff
static int (*a52_decore)(decode_t *decode);
static void *handle;
static char module[TC_BUF_MAX];

int a52_do_init(char *path) {
#ifdef SYS_BSD
    const
#endif    
    char *error;

    snprintf(module, sizeof(module), "%s/%s", path, MODULE);
  
    if(verbose & TC_DEBUG) 
	fprintf(stderr, "loading external module %s\n", module); 

    // try transcode's module directory
    handle = dlopen(module, RTLD_NOW); 
    if (!handle) {
      //try the default:
      //      handle = dlopen(MODULE, RTLD_GLOBAL| RTLD_LAZY);
      if (!handle) {
	error = dlerror();
	fputs (error, stderr);
	fputs("\n", stderr);
	return(-1);
      }
    }
    
    a52_decore = dlsym(handle, "a52_decore");   
    if ((error = dlerror()) != NULL)  {
      fputs(error, stderr);
      fputs("\n", stderr);
      return(-1);
    }

    return(0);
}

/* ------------------------------------------------------------ 
 *
 * decoder thread
 *
 * ------------------------------------------------------------*/

void decode_a52(decode_t *decode)
{
  verbose = decode->verbose;
  
  //load the codec
  if(a52_do_init(mod_path)<0) {
    fprintf(stderr, "failed to init ATSC A-52 stream decoder\n");
    import_exit(1);
  }
  
  a52_decore(decode);
  dlclose(handle);
  import_exit(0);
}
