test_stc.c

来自「linux数字电视播放器,比先的版本高一些.」· C语言 代码 · 共 75 行

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/* test_stc.c - Test for DMX_GET_STC. * usage: DEMUX=/dev/dvb/adapterX/demuxX test_stc * * Copyright (C) 2003 convergence GmbH * Johannes Stezenbach <js@convergence.de> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public License * as published by the Free Software Foundation; either version 2.1 * 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 Lesser 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. */#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <sys/ioctl.h>#include <errno.h>#include <linux/dvb/dmx.h>void usage(void){	fprintf(stderr, "usage: test_stc\n");	fprintf(stderr, "       The default demux device used can be changed\n");	fprintf(stderr, "       using the DEMUX environment variable;\n");        fprintf(stderr, "\n");	exit(1);}int main(int argc, char *argv[]){	int dmxfd;	char * dmxdev = "/dev/dvb/adapter0/demux0";	struct dmx_stc stc;	if (argc != 1 || argv[1])		usage();	if (getenv("DEMUX"))		dmxdev = getenv("DEMUX");	fprintf(stderr, "test_stc: using '%s'\n", dmxdev);	if ((dmxfd = open(dmxdev, O_RDWR)) < 0) {		perror("open");		return 1;	}	stc.num = 0;	if (ioctl(dmxfd, DMX_GET_STC, &stc) == -1) {		perror("DMX_GET_STC");		return 1;	}	printf("STC = %llu (%llu / %u)\n", stc.stc / stc.base, stc.stc, stc.base);	close(dmxfd);	return 0;}

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