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Diffstat (limited to '')
| -rw-r--r-- | test/video.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/test/video.c b/test/video.c new file mode 100644 index 0000000..ea9e4a2 --- /dev/null +++ b/test/video.c @@ -0,0 +1,182 @@ + /** + * A tiny video watching application, just starts capturing /dev/video + * into /dev/fb0. + * Be shure to have >8Bit/pixel color resolution and r/w access for + * /dev/video0, /dev/fb0 and /dev/tty0 to let this work... + * + * compile with + * + * $ gcc -g -Wall -O2 -o video video.c -I../../ost/include + */ + +#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", argv[0]); + exit (-1); + } + + return init_video (stop); +} + |