example-clients/samplerate.c

   1 /*
   2  *  smaplerate.c -- get current samplerate
   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
  33 void jack_shutdown(void *arg)
  34 {
  35         fprintf(stderr, "JACK shut down, exiting ...\n");
  36         exit(1);
  37 }
  38
  39 void signal_handler(int sig)
  40 {
  41         jack_client_close(client);
  42         fprintf(stderr, "signal received, exiting ...\n");
  43         exit(0);
  44 }
  45
  46 void parse_arguments(int argc, char *argv[])
  47 {
  48
  49         /* basename $0 */
  50         package = strrchr(argv[0], '/');
  51         if (package == 0)
  52                 package = argv[0];
  53         else
  54                 package++;
  55
  56         if (argc==1) {
  57                 return;
  58         }
  59         fprintf(stderr, "usage: %s\n", package);
  60         exit(9);
  61 }
  62
  63 int main(int argc, char *argv[])
  64 {
  65         parse_arguments(argc, argv);
  66
  67         /* become a JACK client */
  68         if ((client = jack_client_open(package, JackNullOption, NULL)) == 0) {
  69                 fprintf(stderr, "JACK server not running?\n");
  70                 exit(1);
  71         }
  72
  73         signal(SIGQUIT, signal_handler);
  74         signal(SIGTERM, signal_handler);
  75         signal(SIGHUP, signal_handler);
  76         signal(SIGINT, signal_handler);
  77
  78         jack_on_shutdown(client, jack_shutdown, 0);
  79
  80         fprintf(stdout, "%d\n", jack_get_sample_rate( client ) );
  81
  82         jack_client_close(client);
  83
  84         return 0;
  85 }