/* display single iframes as stillimages * iframes can be created with the 'convert' tool from imagemagick * and mpeg2encode from ftp.mpeg.org, and must have a supported * size, e.g. 702x576: *   $ convert -sample 702x576\! test.jpg test.mpg * * or more advanced using netpbm and mpeg2enc (not mpeg2encode) : *   $ cat image.jpg | jpegtopnm | pnmscale -xsize=704 -ysize=576 |\ *      ppmntsc --pal | ppmtoy4m  -F 25:1 -A 4:3 |\ *      mpeg2enc -f 7 -T 90 -F 3 -np -a 2 -o "image.mpg" * */#include <sys/ioctl.h>#include <stdlib.h>#include <stdio.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <time.h>#include <unistd.h>#include <linux/dvb/video.h>static const char *usage_string = "\n\t"	"usage: %s <still.mpg> [still.mpg ...]\n"	"\n\t"	"to use another videodev than the first, set the environment variable VIDEODEV\n\t"	"e.g.[user@linux]$ export VIDEODEV=\"/dev/dvb/adapter1/video1\".\n\t"	"to display the image <n> seconds, instead of 10, set the variable SSTIME\n\t"	"e.g. [user@linux]$ export SSTIME=\"60\" to display the still for 1 minute.\n\t"	"this options can be set in the same line as the %s command:\n\t"	"e.g. $ SSTIME=25 VIDEODEV=/dev/dvb/adapter1/video1 %s ...\n";int main (int argc, char **argv){	int fd;	int filefd;	struct stat st;	struct video_still_picture sp;	char *videodev = "/dev/dvb/adapter0/video0";	char *env_sstime;	int i = 1;	int tsec = 10;	if (argc < 2) {		fprintf (stderr, usage_string, argv[0],argv[0],argv[0]);		return -1;	}	if (getenv ("VIDEODEV"))		videodev = getenv("VIDEODEV");	if (getenv ("SSTIME")) {		env_sstime = getenv("SSTIME");		tsec = atoi(env_sstime);	}	if ((fd = open(videodev, O_RDWR)) < 0) {		perror(videodev);		return -1;	}next_pic:	printf("I-frame     : '%s'\n", argv[i]);	if ((filefd = open(argv[i], O_RDONLY)) < 0) {		perror(argv[i]);		return -1;	}	fstat(filefd, &st);	sp.iFrame = (char *) malloc (st.st_size);	sp.size = st.st_size;	printf("I-frame size: %d\n", sp.size);	if (!sp.iFrame) {		fprintf (stderr, "No memory for I-Frame\n");		return -1;	}	printf ("read: %d bytes\n", read(filefd, sp.iFrame, sp.size));	close(filefd);	if ((ioctl(fd, VIDEO_STILLPICTURE, &sp) < 0)) {		perror("ioctl VIDEO_STILLPICTURE");		return -1;	}	free(sp.iFrame);	printf("Display image %d seconds ...\n",tsec);	sleep(tsec);	printf("Done.\n");	if (argc > ++i)		goto next_pic;	return 0;}