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#define USAGE \
"\n" \
"\n A tiny video watching application, just starts capturing /dev/video" \
"\n into /dev/fb0." \
"\n Be shure to have >8Bit/pixel color resolution and r/w access for " \
"\n /dev/video0, /dev/fb0 and /dev/tty0 to let this work..." \
"\n" \
"\n compile with" \
"\n" \
"\n $ gcc -g -Wall -O2 -o video video.c -I../../ost/include" \
"\n"
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <linux/fb.h>
#include <linux/videodev.h>
#define VIDEO_DEV "/dev/video0"
#define FB_DEV "/dev/fb0"
#define VT_DEV "/dev/tty0"
static char *video_devname = VIDEO_DEV;
#define min(a,b) (a) < (b) ? (a) : (b)
static int zero = 0;
static int one = 1;
static struct fb_var_screeninfo fb_var;
static struct fb_fix_screeninfo fb_fix;
int init_fb (void)
{
const char blankoff_str[] = "\033[9;0]";
int fd, vt_fd;
fd = open (FB_DEV, O_RDWR);
if (fd < 0) {
perror("Could not open " FB_DEV ", please check permissions\n");
return 1;
}
if ((vt_fd = open( VT_DEV, O_RDWR )) < 0) {
perror("Could not open " VT_DEV ", please check permissions\n");
return 1;
}
write( vt_fd, blankoff_str, strlen(blankoff_str) );
if (ioctl (fd, FBIOGET_VSCREENINFO, &fb_var) < 0) {
perror("Could not get variable screen information (fb_var)\n");
return 1;
}
if (ioctl (fd, FBIOGET_FSCREENINFO, &fb_fix) < 0) {
perror("Could not get fixed screen information (fb_fix)\n");
return 1;
}
close (fd);
return 0;
}
int init_video (int stop)
{
int fd;
struct video_capability vcap;
if ((fd = open (video_devname, O_RDWR)) < 0) {
fprintf (stderr,
"%s: Could not open %s, please check permissions\n",
__FUNCTION__, video_devname);
return -1;
}
ioctl(fd, VIDIOCGCAP, &vcap);
if (ioctl(fd, VIDIOCCAPTURE, &zero) < 0) {
perror("Could not stop capturing (VIDIOCCAPTURE failed)\n");
return -2;
}
if (stop)
return 0;
{
struct video_buffer b;
b.base = (void*) fb_fix.smem_start;
b.width = fb_var.xres;
b.height = fb_var.yres;
b.depth = fb_var.bits_per_pixel;
b.bytesperline = fb_var.xres*((fb_var.bits_per_pixel+7)/8);
if (ioctl(fd, VIDIOCSFBUF, &b) < 0) {
fprintf(stderr, "VIDIOCSFBUF failed, must run as root?\n");
return -3;
}
}
{
struct video_picture p;
if (ioctl(fd, VIDIOCGPICT, &p) < 0) {
perror("VIDIOCGPICT failed\n");
return -4;
}
p.depth = fb_var.bits_per_pixel;
switch (fb_var.bits_per_pixel) {
case 16:
p.palette = VIDEO_PALETTE_RGB565;
break;
case 24:
p.palette = VIDEO_PALETTE_RGB24;
break;
case 32:
p.palette = VIDEO_PALETTE_RGB32;
break;
}
//p.contrast = 0x8000;
//p.colour = 0x6000;
if (ioctl(fd, VIDIOCSPICT, &p) < 0) {
perror("VIDIOCSPICT failed\n");
return -5;
}
}
{
struct video_window win;
win.width = min((__u32) vcap.maxwidth, fb_var.xres);
win.height = min((__u32) vcap.maxheight, fb_var.yres);
win.x = 0;
win.y = 0;
win.flags = 0;
win.clips = NULL;
win.clipcount = 0;
win.chromakey = 0;
if (ioctl(fd, VIDIOCSWIN, &win) < 0) {
perror("VIDIOCSWIN failed\n");
return -6;
}
}
if (ioctl(fd, VIDIOCCAPTURE, &one) < 0) {
perror("Could not start capturing (VIDIOCCAPTURE failed)\n");
return -7;
}
close (fd);
return 0;
}
int main (int argc, char **argv)
{
int err = 0, stop = 0;
if ((err = init_fb()))
return err;
if ((argc == 2 && strcmp(argv[1], "stop") == 0) ||
(argc == 3 && strcmp(argv[2], "stop") == 0))
stop = 1;
if ((argc == 2 && !stop) || argc == 3)
video_devname = argv[1];
if (argc != 1 && argc != 2 && !(argc == 3 && stop)) {
fprintf(stderr, "usage: %s <devname> <stop>\n" USAGE, argv[0]);
exit (-1);
}
return init_video (stop);
}
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