On 16/06/16 02:37, Steve Longerbeam wrote:
Hi Jack,
On 06/15/2016 03:43 AM, Jack Mitchell wrote:
<snip>
Trying to use a user pointer rather than mmap also fails and causes a kernel splat.
Hmm, I've tested userptr with the mem2mem driver, but maybe never
with video capture. I tried "v4l2-ctl -d/dev/video0 --stream-user=8" but
that returns "VIDIOC_QBUF: failed: Invalid argument", haven't tracked
down why (could be a bug in v4l2-ctl). Can you share the splat?
On re-checking the splat was the same v4l_cropcap that was mentioned
before so I don't think it's related. The error I get back is:
VIDIOC_QBUF error 22, Invalid argument
I'm using the example program the the v4l2 docs [1].
Cheers,
Jack
[1] https://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
Apart from that and a few v4l2-compliance tests failing which you already mentioned, it seems to work OK. I'll try and do some more testing and see if I can come back with some more feedback.
Thanks!
Steve
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