/**********************************************-*- indent-tabs-mode:nil; -*-
 *                                                                         *
 *   Jack Transport Audit Utils                                            *
 *                                                                         *
 *   Copyright (C) 2009 by Gabriel M. Beddingfield                         *
 *   gabriel@teuton.org                                                    *
 *                                                                         *
 *   "For of him [God], and through him, and unto him, are all things.     *
 *   To him be the glory for ever. Amen." (Romans 11:36)                   *
 *                                                                         *
 *   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; version 2 of the License, or 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.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/* jack_set_buffer_size.cpp
 *
 * Command-line utility to change the buffer-size (samples per period) on a
 * running jack server.
 */

#include <cstdlib>
#include <iostream>
#include <jack/jack.h>

using namespace std;

void usage()
{
    cout << "usage: jack_set_buffer_size <N>" << endl
         << "\tWhere N is an integer that is a power of two" << endl
         << "\tThe JACK server must already be running" << endl
         << endl;
}

int main(int argc, char* argv[])
{
    jack_client_t *client = 0;
    jack_nframes_t nframes = 0;

    cout << "jack_set_buffer_size "
        "Copyright (C)2009 by Gabriel M. Beddingfield" << endl;

    /* Parse command line...
     */
    if( argc != 2 ) {
        usage();
        exit(EXIT_SUCCESS);
    }
    long tmp_i = atol(argv[1]);
    if( tmp_i > 0 ) nframes = (jack_nframes_t)tmp_i;

    /* Check value given by user.
     */
    if( (nframes == 0)
        || ( 0 != (nframes & (nframes-1)) ) ) {
        usage();
        cout << "Error: N (" << argv[1] << ") must be"
            "a non-zero integer that is a power of two "
            "(2, 4, 8, 16, 32, etc.)"
             << endl
             << "Exiting..." << endl;
        exit(EXIT_FAILURE);
    }


    client = jack_client_open("jack_set_buffer_size",
			      JackNoStartServer,
			      0);

    if( !client ) {
        cout << "Error connecting to jack server." << endl
             << "Exiting..." << endl;
        exit(EXIT_FAILURE);
    }

    int rv = jack_set_buffer_size(client, nframes);

    if( rv ) {
        cout << "Error setting buffer size, JACK did not accept it."
             << endl;
        rv = EXIT_FAILURE;
    } else {
        rv = EXIT_SUCCESS;
    }

    jack_client_close(client);

    return rv;
}