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    SubjectRe: support autofocus / autogain in libv4l2
    Hi!

    > > > Please don't add a new application under lib/. It is fine if you want
    > > > some testing application, if the ones there aren't enough, but please
    > > > place it under contrib/test/.
    > > >
    > > > You should likely take a look at v4l2grab first, as it could have
    > > > almost everything you would need.
    > >
    > > I really need some kind of video output. v4l2grab is not useful
    > > there. v4l2gl might be, but I don't think I have enough dependencies.
    >
    > Well, you could use some app to show the snaps that v4l2grab takes.

    That would be too slow :-(.

    > Yeah, compiling v4l2gl on N9 can indeed be complex. I suspect that it
    > shouldn't hard to compile xawtv there (probably disabling some optional
    > features).

    I do have mplayer working, but that one is not linked against libv4l2
    :-(.

    > > Umm, and it looks like libv4l can not automatically convert from
    > > GRBG10.. and if it could, going through RGB24 would probably be too
    > > slow on this device :-(.
    >
    > I suspect it shouldn't be hard to add support for GRBG10. It already
    > supports 8 and 16 bits Bayer formats, at lib/libv4lconvert/bayer.c
    > (to both RGB and YUV formats).

    Is 16bit bayer a recent development? I can't see it in

    commit 374806e868f5a7a48ecffde4c6a1abfcfa5ccd65
    Author: Hans Verkuil <hans.verkuil@cisco.com>
    Date: Fri Apr 22 09:31:57 2016 +0200

    > > Is there an example using autogain/autowhitebalance from
    > > libv4lconvert?
    >
    > Well, if you plug a USB camera without those controls, it should
    > automatically expose controls for it, as if the device had such
    > controls.

    And settings are persistent, so I can enable autogain, then lauch
    something like xawtv, and it will automatically get autogain? Ok,
    good.

    Regards,
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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