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    SubjectRe: support autofocus / autogain in libv4l2
    Em Tue, 25 Apr 2017 00:07:01 +0200
    Pavel Machek <pavel@ucw.cz> escreveu:

    > 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.

    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).

    > 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).

    How it would preform is another question ;)

    > > IMO, the above belongs to a separate processing module under
    > > lib/libv4lconvert/processing/
    >
    > 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.

    Thanks,
    Mauro

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