146 lines
4.5 KiB
C
146 lines
4.5 KiB
C
/*******************************************************************************
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# #
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# MJPG-streamer allows to stream JPG frames from an input-plugin #
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# to several output plugins #
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# #
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# Copyright (C) 2007 Tom Stöveken #
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# #
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# This program is free software; you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation; version 2 of the License. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program; if not, write to the Free Software #
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# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA #
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# #
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*******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <linux/types.h>
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#include <string.h>
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#include <fcntl.h>
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#include <wait.h>
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#include <time.h>
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#include <limits.h>
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#include <linux/stat.h>
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#include <sys/stat.h>
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#include "utils.h"
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/******************************************************************************
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Description.:
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Input Value.:
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Return Value:
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******************************************************************************/
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void daemon_mode(void)
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{
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int fr = 0;
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fr = fork();
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if(fr < 0) {
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fprintf(stderr, "fork() failed\n");
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exit(1);
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}
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if(fr > 0) {
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exit(0);
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}
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if(setsid() < 0) {
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fprintf(stderr, "setsid() failed\n");
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exit(1);
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}
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fr = fork();
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if(fr < 0) {
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fprintf(stderr, "fork() failed\n");
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exit(1);
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}
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if(fr > 0) {
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fprintf(stderr, "forked to background (%d)\n", fr);
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exit(0);
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}
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umask(0);
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fr = chdir("/");
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if(fr != 0) {
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fprintf(stderr, "chdir(/) failed\n");
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exit(0);
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}
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close(0);
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close(1);
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close(2);
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open("/dev/null", O_RDWR);
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fr = dup(0);
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fr = dup(0);
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}
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/*
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* Common webcam resolutions with information from
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* http://en.wikipedia.org/wiki/Graphics_display_resolution
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*/
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static const struct {
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const char *string;
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const int width, height;
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} resolutions[] = {
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{ "QQVGA", 160, 120 },
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{ "QCIF", 176, 144 },
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{ "CGA", 320, 200 },
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{ "QVGA", 320, 240 },
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{ "CIF", 352, 288 },
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{ "PAL", 720, 576 },
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{ "VGA", 640, 480 },
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{ "SVGA", 800, 600 },
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{ "XGA", 1024, 768 },
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{ "HD", 1280, 720 },
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{ "SXGA", 1280, 1024 },
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{ "UXGA", 1600, 1200 },
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{ "FHD", 1920, 1280 },
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};
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/******************************************************************************
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Description.: convienence function for input plugins
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Input Value.:
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Return Value:
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******************************************************************************/
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void parse_resolution_opt(const char * optarg, int * width, int * height) {
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int i;
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/* try to find the resolution in lookup table "resolutions" */
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for(i = 0; i < LENGTH_OF(resolutions); i++) {
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if(strcmp(resolutions[i].string, optarg) == 0) {
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*width = resolutions[i].width;
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*height = resolutions[i].height;
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return;
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}
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}
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/* parse value as decimal value */
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if (sscanf(optarg, "%dx%d", width, height) != 2) {
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fprintf(stderr, "Invalid height/width '%s' specified!\n", optarg);
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exit(EXIT_FAILURE);
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}
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}
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void resolutions_help(const char * padding) {
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int i;
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for(i = 0; i < LENGTH_OF(resolutions); i++) {
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fprintf(stderr, "%s ", resolutions[i].string);
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if((i + 1) % 6 == 0)
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fprintf(stderr, "\n%s", padding);
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}
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fprintf(stderr, "\n%sor a custom value like the following" \
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"\n%sexample: 640x480\n", padding, padding);
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}
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