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Groups > linux.kernel > #1631386

Re: support autofocus / autogain in libv4l2

From Pavel Machek <pavel@ucw.cz>
Newsgroups linux.kernel
Subject Re: support autofocus / autogain in libv4l2
Date 2017-04-26 13:00 +0200
Message-ID <tAsPU-197-17@gated-at.bofh.it> (permalink)
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On Tue 2017-04-25 12:53:27, Nicolas Dufresne wrote:
> Le mardi 25 avril 2017 à 10:05 +0200, Pavel Machek a écrit :
> > Well, fd's are hard, because application can do fork() and now
> > interesting stuff happens. Threads are tricky, because now you have
> > locking etc.
> > 
> > libv4l2 is designed to be LD_PRELOADED. That is not really feasible
> > with "complex" library.
> 
> That is incorrect. The library propose an API where you simply replace
> certain low level calls, like ioctl -> v4l2_ioctl, open -> v4l2_open().
> You have to do that explicitly in your existing code. It does not
> abstract the API itself unlike libdrm.

You are right, no LD_PRELOAD. But same API as kernel, which is really
limiting -- see my other mail.

									Pavel

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

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Re: support autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-24 23:30 +0200
  Re: support autofocus / autogain in libv4l2 Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-04-25 03:50 +0200
    Re: support autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-25 10:10 +0200
      Re: support autofocus / autogain in libv4l2 Pali Rohár <pali.rohar@gmail.com> - 2017-04-25 10:20 +0200
        Re: support autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-25 13:30 +0200
          Re: support autofocus / autogain in libv4l2 Pali Rohár <pali.rohar@gmail.com> - 2017-04-25 13:40 +0200
            Re: support autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-25 14:30 +0200
              Re: support autofocus / autogain in libv4l2 Pali Rohár <pali.rohar@gmail.com> - 2017-04-25 15:00 +0200
            Re: support autofocus / autogain in libv4l2 Nicolas Dufresne <nicolas@ndufresne.ca> - 2017-04-25 19:00 +0200
        Re: support autofocus / autogain in libv4l2 Nicolas Dufresne <nicolas@ndufresne.ca> - 2017-04-25 19:00 +0200
      Re: support autofocus / autogain in libv4l2 Nicolas Dufresne <nicolas@ndufresne.ca> - 2017-04-25 19:00 +0200
        Re: support autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-26 13:00 +0200
    [patch] propagating controls in libv4l2 was Re: support autofocus /  autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-26 13:00 +0200
      Re: [patch] propagating controls in libv4l2 was Re: support  autofocus / autogain in libv4l2 Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-04-26 13:20 +0200
        [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Pavel Machek <pavel@ucw.cz> - 2017-04-26 15:30 +0200
          Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> - 2017-04-26 17:50 +0200
            Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Pavel Machek <pavel@ucw.cz> - 2017-04-27 01:00 +0200
              Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> - 2017-04-27 08:00 +0200
            Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Russell King - ARM Linux <linux@armlinux.org.uk> - 2017-05-03 21:10 +0200
              Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Pavel Machek <pavel@ucw.cz> - 2017-05-03 22:00 +0200
          Re: [patch] autogain support for bayer10 format (was Re: [patch]  propagating controls in libv4l2) Pavel Machek <pavel@ucw.cz> - 2017-05-01 00:50 +0200
      Re: [patch] propagating controls in libv4l2 was Re: support  autofocus / autogain in libv4l2 Mauro Carvalho Chehab <mchehab@s-opensource.com> - 2017-04-26 13:30 +0200
        Re: [patch] propagating controls in libv4l2 was Re: support  autofocus / autogain in libv4l2 Pavel Machek <pavel@ucw.cz> - 2017-04-29 11:20 +0200

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