Skype not getting video from webcam

[Alexander Leidinger]

Quoting Jashank Jeremy <jashank.jeremy at optusnet.com.au> (from Tue, 5  
Oct 2010 09:31:34 +1100):

> On Mon, Oct 04, 2010 at 12:24:27PM +0200, Hans Petter Selasky wrote:
>> The IOCTL's are being changed by the Linux-oxulator. See linux.ko.
>
> So the Linuxolator is changing ioctl(2); that I would expect. What I
> don't expect is it to change one ioctl(2) into a completely unrelated
> one.
>
> uvcvideo: uvc_v4l2_ioctl(VIDIOCGCAP)
> uvcvideo: Unknown ioctl 0x40047601
> uvcvideo: uvc_v4l2_ioctl(VIDIOCGCAP)
> uvcvideo: Trying format 0x56595559 (YUYV): 10000x10000.
> uvcvideo: Using default frame interval 200000.0 us (5.0 fps).
>
> corresponds to
>
>  86117 skype    CALL  linux_ioctl(0xb,0x80685600 ,0x2dc9e014)
>  86117 skype    RET   linux_ioctl -1 errno 22 Invalid argument
>  86117 skype    CALL  linux_ioctl(0xb,0x803c7601 ,0x2dc9e07c)
>  86117 skype    RET   linux_ioctl 0
>
> The ioctl(2)'s are completely different, and when I go and check the
> lookup table in stable/8/sys/compat/linux/linux_ioctl.h, I find:
>
> #define LINUX_VT_OPENQRY	0x5600
> #define LINUX_VIDIOCGCAP		0x7601
>
> Why is Skype sending a VT_OPENQRY, and webcamd receiving it as a
> VIDIOCGCAP?

I'm not sure this is what is happening. The OPENQRY gets the "Invalid  
argument" response, not an "Unknown ioctl"/ENOSYS.

Maybe you need to add some printfs to linux_ioctl.c to find out what  
is going on there.

Bye,
Alexander.

-- 
Professor Farnsworth: "Oh my, that steamed carrot was a bit spicy for me."

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