tools/bufsize.c

   1 /*
   2  *  bufsize.c -- change JACK buffer size.
   3  *
   4  *  Copyright (C) 2003 Jack O'Quin.
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include <stdio.h>
  22 #include <errno.h>
  23 #include <unistd.h>
  24 #include <signal.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <jack/jack.h>
  28 #include <jack/transport.h>
  29
  30 char *package;                          /* program name */
  31 jack_client_t *client;
  32 jack_nframes_t nframes;
  33
  34 void jack_shutdown(void *arg)
  35 {
  36         fprintf(stderr, "JACK shut down, exiting ...\n");
  37         exit(1);
  38 }
  39
  40 void signal_handler(int sig)
  41 {
  42         jack_client_close(client);
  43         fprintf(stderr, "signal received, exiting ...\n");
  44         exit(0);
  45 }
  46
  47 void parse_arguments(int argc, char *argv[])
  48 {
  49
  50         /* basename $0 */
  51         package = strrchr(argv[0], '/');
  52         if (package == 0)
  53                 package = argv[0];
  54         else
  55                 package++;
  56
  57         if (argc < 2) {
  58                 fprintf(stderr, "usage: %s <bufsize>\n", package);
  59                 exit(9);
  60         }
  61
  62         nframes = strtoul(argv[1], NULL, 0);
  63         if (errno == ERANGE) {
  64                 fprintf(stderr, "%s: invalid buffer size: %s\n",
  65                         package, argv[1]);
  66                 exit(2);
  67         }
  68 }
  69
  70 int main(int argc, char *argv[])
  71 {
  72         int rc;
  73
  74         parse_arguments(argc, argv);
  75
  76         /* become a JACK client */
  77         if ((client = jack_client_new(package)) == 0) {
  78                 fprintf(stderr, "JACK server not running?\n");
  79                 exit(1);
  80         }
  81
  82         signal(SIGQUIT, signal_handler);
  83         signal(SIGTERM, signal_handler);
  84         signal(SIGHUP, signal_handler);
  85         signal(SIGINT, signal_handler);
  86
  87         jack_on_shutdown(client, jack_shutdown, 0);
  88
  89         rc = jack_set_buffer_size(client, nframes);
  90         if (rc)
  91                 fprintf(stderr, "jack_set_buffer_size(): %s\n", strerror(rc));
  92
  93         jack_client_close(client);
  94
  95         return rc;
  96 }