On Sat, Aug 15, 2009 at 6:36 AM, Rath<mailings@xxxxxxxxxxxxxxxxxxxxx> wrote:
> Hi,
>
> with this code from the internet I only get pictures with some undefined
> pixels on the top and black pixels on the bottom.
>
> Where's the problem? I only want a simple example for image captureing.
>
> Here is the code:
>
> #include <stdio.h>
> #include <unistd.h>
> #include <fcntl.h>
> #include <sys/ioctl.h>
> #include <libv4l1.h>
> #include <linux/videodev.h>
>
> #define GES_LAENGE (640*480)
>
> unsigned char bild[GES_LAENGE];
>
> int main()
> {
> int fd;
> long laenge;
> struct video_window video_win;
> FILE *bilddatei;
>
> if((fd = v4l1_open("/dev/video0", O_RDONLY)) == -1)
> {
> printf("Fehler beim Oeffnen von /dev/video0\r\n");
> return 1;
> }
> if( v4l1_ioctl( fd, VIDIOCGWIN, &video_win) == -1)
> {
> printf("Fehler beim setzen der Einstellungen\r\n");
> return 1;
> }
> laenge = video_win.width * video_win.height;
> if( laenge > GES_LAENGE)
> {
> printf("Bild ist groesser als angegeben\r\n");
> return 1;
> }
>
>
> if( v4l1_read( fd, bild, laenge) == -1)
> {
> printf("Auslesen der Kamera nicht möglch\r\n");
> return 1;
> }
> if((bilddatei = fopen( "bild.ppm", "w+b")) == NULL)
> {
> printf("Konnte die datei zum schreiben nicht öffnen\r\n");
> return 1;
> }
> v4l1_close(fd);
> fprintf( bilddatei, "P6\n%d %d\n255\n",video_win.width,
> video_win.height);
> fwrite( bild, 1, video_win.width*video_win.height,bilddatei);
> fclose(bilddatei);
> return 0;
> }
>
Hi Joern,
That code seems to be using v4l1 APIs. How about using current version
of video4linux?
You can find a simple example code at following document:
http://www.linuxtv.org/downloads/video4linux/API/V4L2_API/spec-single/v4l2.html#CAPTURE-EXAMPLE
And about the weird image you got from the v4l1 example code, could be
a pixelformat missmatch or just some noise fetched but I can't say any
further without knowing your environment :-)
Cheers,
Nate
> Regards, Joern
> --
> To unsubscribe from this list: send the line "unsubscribe linux-media" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
=
DongSoo, Nathaniel Kim
Engineer
Mobile S/W Platform Lab.
Digital Media & Communications R&D Centre
Samsung Electronics CO., LTD.
e-mail : dongsoo.kim@xxxxxxxxx
dongsoo45.kim@xxxxxxxxxxx
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
