On Mon, 16 Mar 2009, Hans de Goede wrote:
Adam Baker wrote:
Hi all,
I've finally got round to writing a sample patch to support the proposed
mechanism of reporting sensor orientation to user space. It is split into 2
parts, part 1 contains the kernel changes and part 2 the libv4l changes. In
order to keep the patch simple I haven't attempted to add support to libv4l
for HFLIP and VFLIP but just assumed for now that if a cam needs one then
it needs both. If the basic idea gets accepted then fixing that is purely a
user space change.
I also haven't provided an implementation of VIDIOC_ENUMINPUT in libv4l
that updates the flags to reflect what libv4l has done to the image. Hans
Verkuil originally said he wanted to leave the orientation information
available to the user app but I suspect that is actually undesirable. If an
app is designed to work without libv4l and to re-orient an image as
required then if someone runs it with the LD_PRELOAD capability of libv4l
then correct operation depends upon reporting the corrected orientation to
the app, not the original orientation.
Finally, we can get the SQ905 cameras to work right-side-up, and move on
to other things. This appears to me to be exactly the kind of solution
which we needed.
Theodore Kilgore
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