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Sourcecode: jack-audio-connection-kit version File versions  Download package

bufsize.c

/*
 *  bufsize.c -- change JACK buffer size.
 *
 *  Copyright (C) 2003 Jack O'Quin.
 *  
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <stdio.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <jack/jack.h>
#include <jack/transport.h>

char *package;                      /* program name */
jack_client_t *client;
jack_nframes_t nframes;

void jack_shutdown(void *arg)
{
      fprintf(stderr, "JACK shut down, exiting ...\n");
      exit(1);
}

void signal_handler(int sig)
{
      jack_client_close(client);
      fprintf(stderr, "signal received, exiting ...\n");
      exit(0);
}

void parse_arguments(int argc, char *argv[])
{

      /* basename $0 */
      package = strrchr(argv[0], '/');
      if (package == 0)
            package = argv[0];
      else
            package++;

      if (argc < 2) {
            fprintf(stderr, "usage: %s <bufsize>\n", package);
            exit(9);
      }

      nframes = strtoul(argv[1], NULL, 0);
      if (errno == ERANGE) {
            fprintf(stderr, "%s: invalid buffer size: %s\n",
                  package, argv[1]);
            exit(2);
      }
}

int main(int argc, char *argv[])
{
      int rc;

      parse_arguments(argc, argv);

      /* become a JACK client */
      if ((client = jack_client_new(package)) == 0) {
            fprintf(stderr, "JACK server not running?\n");
            exit(1);
      }

      signal(SIGQUIT, signal_handler);
      signal(SIGTERM, signal_handler);
      signal(SIGHUP, signal_handler);
      signal(SIGINT, signal_handler);

      jack_on_shutdown(client, jack_shutdown, 0);

      rc = jack_set_buffer_size(client, nframes);
      if (rc)
            fprintf(stderr, "jack_set_buffer_size(): %s\n", strerror(rc));
      
      jack_client_close(client);

      return rc;
}

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