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Re: [Xen-devel] [PATCH] usbfront: do not assume sequentially mapped page

Ian,

I tried out uvccapture-0.5, and I'm certain that we have the
same problem.

When uvccapture had started memcpy-ing from the v4l2_buffer, the v4l2_buffer was not filled yet.
(in line 294 of v4l2uvc.c, vd->buf.bytesused is less than HEADERFRAME1)

I'm uncertain whether this problem results from the isoc-transfer timing or v4l relating.

Regards,

Noboru

Ian Jackson wrote:
Noboru Iwamatsu writes ("Re: [Xen-devel] [PATCH] usbfront: do not assume 
sequentially mapped pages"):
Ian,
 > You might like to try a v4l uvc driver and see if it works for you.

Sorry for the late reply.

I've been trying USB2.0 UVC webcam too, but I have not succeeded yet.
I dumped urbs and saw no errors in isoc-urbs.

I didn't see errors.  I ran uvccapture (as in Debian lenny), which
seems to be the most simple test program available, and it segfaults
while accessing what is supposed to be a buffer full of video data
provided by mmapping the kernel's UVC driver.

Ian.




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