root/trunk/jack/tools/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;
int just_print_bufsize=0;

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==1) {
                just_print_bufsize = 1;
                return;
        }
        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);

        if (just_print_bufsize) {
                fprintf(stdout, "%d\n", jack_get_buffer_size( client ) );
                rc=0;
        }
        else
        {
                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;
}