Hi Guennadi,
Thanks for your quick response.
> ./capture-example -u -f -d /dev/video0
> mx3-camera mx3-camera.0: MX3 Camera driver attached to camera 0
> Failed acquiring VMA for vaddr 0x76cd9008
> VIDIOC_QBUF error 22, Invalid arg
>> It doesn't surprise me, that this doesn't work. capture-example allocates
>> absolutely normal user-space buffers, when called with USERPTR, and those
>> buffers are very likely discontiguous. Whereas mx3-camera needs physically
>> contiguous buffers, so, this can only fail. This means, you either have to
>> use MMAP or you need to allocate USERPTR buffers in a special way to
>> guarantee their contiguity.
I have a little progress:-)
In thread "i.mx35 live video" you and Sylvester gave me advice on how to get the live video
with using the display panning method ... thanks for this invaluable support :-)
I took note of this and I'm currently trying to implement this.
Instead of discontiguous memory allocation I use framebuffer memory allocation
to userspace and this solves the problem.
Now I'm starting to see a live video for 3 seconds, after this video freezes
(it looks like a flickering pause), but the application continues to run without errors.
can see bellow my strace diagnostic:
ioctl(3, VIDIOC_STREAMON, 0x7ece99f0) = 0
select(4, [3], NULL, NULL, {2, 0}) = 1 (in [3], left {1, 884508})
ioctl(3, VIDIOC_DQBUF, 0x7ece990c) = 0
ioctl(4, FBIOPAN_DISPLAY, 0x7ece9854) = 0
ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0x7ece990c) = 0
select(4, [3], NULL, NULL, {2, 0}) = 1 (in [3], left {1, 919066})
ioctl(3, VIDIOC_DQBUF, 0x7ece990c) = 0
ioctl(4, FBIOPAN_DISPLAY, 0x7ece9854) = 0
ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0x7ece990c) = 0
select(4, [3], NULL, NULL, {2, 0}) = 1 (in [3], left {1, 918928})
ioctl(3, VIDIOC_DQBUF, 0x7ece990c) = 0
ioctl(4, FBIOPAN_DISPLAY, 0x7ece9854) = 0
[snip]
ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0x7ece990c) = 0
select(4, [3], NULL, NULL, {2, 0}) = 1 (in [3], left {1, 999987})
ioctl(3, VIDIOC_DQBUF, 0x7ece990c) = 0
ioctl(4, FBIOPAN_DISPLAY, 0x7ece9854) = 0
ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0x7ece990c) = 0
select(4, [3], NULL, NULL, {2, 0}) = 1 (in [3], left {1, 999988})
ioctl(3, VIDIOC_DQBUF, 0x7ece990c) = 0
ioctl(4, FBIOPAN_DISPLAY, 0x7ece9854) = 0
ioctl(3, VIDIOC_QBUF or VT_SETACTIVATE, 0x7ece990c) = 0
I do not understand what's the problem, maybe need to implement
FBIO_WAITFORVSYNC ioctl for mx3fb ?
Thanks,
Alex
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