Hello,
I have installed the usb-backport from www.suse.cz and
ov511's driver version 1.25 from alpha.dyndns.org for a USB
creative Webcam III. Besides usb-uhci complaining when I modprobe
it with the webcam connected,
#modprobe usbcore
#modprobe usb-uhci
usb-uhci.c: Detected 2 ports
usb.c: This device is not recognized by any installed USB
driver
#modprobe videodev
#modprobe ov511
everything works fine. I'd like to have 2 USB ports, but my
laptop has only one, and I don't know what the second
warning/error message means.
When I remove modules I get some error messages from usb-uhci
again:
#rmmod usb-uhci
kmem_shrink: Invalid cache addr c3fdfaa0
usb-uhci.c: uhci_desc_kmem remained
kmem_shrink: Invalid cache addr c3fdfb00
usb-uhci.c: urb_priv_kmem remained
Now, I need to set v4l capture parameters and make it work for
our projects (Digital Comms Research Lab, National University of
Cordoba, Argentina).
After opening the device (/dev/video):
ioctl (fd, VIDIOCGCAP, &capab) says:
name: OV511 USB Camera
it can capture to memory and subcapture.
max size: 640 x 480
min size: 32x16
only one channel
Unfortunately there's no SELECT capability.
ioctl (fd, VIDIOCGCHAN, &chan) says:
there's channel 0 called Camera
VIDEO_TYPE is Camera
norm: 49151 (I don't know what this number means,
PAL, NTSC, ...)
ioctl (fd, VIDIOCGPICT, &pict) says:
depth, colour, palette, etc.
I need to get YUV420 QCIF (176x144 pixels) frames at max frame
rate, aprox 20 fps according to Mark McClelland, so:
pict.palette=VIDEO_PALETTE_YUV420;
ioctl (fd, VIDIOCSPICT, &pict);
Then,
ioctl (fd, VIDIOCGCAPTURE, &capture);
capture.x=0;
capture.y=0;
capture.width=176;
capture.heigth=144;
capture.flags=ODD|EVEN;
capture.decimation=0; /*I don't know what this is*/
ioctl (fd, VIDIOCSCAPTURE, &capture);
but it would't accept odd and even frames. It only accepts odd
frames. Is this what I have to set to capture 176x144 frames? How
can I get them all, odd and even?
As far as I understood, then I have to mmap the device. Ok? How?
Am I on the rigth path to capture YUV420 QCIF at full speed?
Any comments will be appreciated.
Thank you,
Matias.
