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xen-devel
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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