From: Pavel Machek <pavel@ucw.cz>
To: Nicolas Dufresne <nicolas@ndufresne.ca>
Cc: Mauro Carvalho Chehab <mchehab@s-opensource.com>,
pali.rohar@gmail.com, sre@kernel.org,
kernel list <linux-kernel@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-omap@vger.kernel.org, tony@atomide.com, khilman@kernel.org,
aaro.koskinen@iki.fi, ivo.g.dimitrov.75@gmail.com,
patrikbachan@gmail.com, serge@hallyn.com, abcloriens@gmail.com,
Sakari Ailus <sakari.ailus@iki.fi>,
Sakari Ailus <sakari.ailus@linux.intel.com>,
linux-media@vger.kernel.org
Subject: Re: support autofocus / autogain in libv4l2
Date: Wed, 26 Apr 2017 12:53:56 +0200 [thread overview]
Message-ID: <20170426105356.GB857@amd> (raw)
In-Reply-To: <1493139207.19105.16.camel@ndufresne.ca>
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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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next prev parent reply other threads:[~2017-04-26 10:54 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-14 12:20 [PATCH v3 0/2] v4l: Add camera voice coil lens control class, current control Sakari Ailus
2017-02-14 12:20 ` [PATCH v3 1/2] " Sakari Ailus
2017-02-14 22:47 ` Pavel Machek
2017-02-15 7:15 ` Sakari Ailus
2017-02-15 8:09 ` Pavel Machek
2017-02-20 22:26 ` Sakari Ailus
2017-02-20 22:48 ` Pavel Machek
2017-04-15 2:23 ` Mauro Carvalho Chehab
2017-04-15 7:12 ` Pavel Machek
2017-04-16 9:12 ` Sakari Ailus
2017-04-19 13:51 ` Mauro Carvalho Chehab
2017-04-24 9:30 ` support autofocus / autogain in libv4l2 Pavel Machek
2017-04-24 13:38 ` Mauro Carvalho Chehab
2017-04-24 21:29 ` Pavel Machek
2017-04-25 1:47 ` Mauro Carvalho Chehab
2017-04-25 8:05 ` Pavel Machek
2017-04-25 8:08 ` Pali Rohár
2017-04-25 11:23 ` Pavel Machek
2017-04-25 11:30 ` Pali Rohár
2017-04-25 12:28 ` Pavel Machek
2017-04-25 12:51 ` Pali Rohár
2017-04-25 16:55 ` Nicolas Dufresne
2017-04-25 16:51 ` Nicolas Dufresne
2017-04-25 16:53 ` Nicolas Dufresne
2017-04-26 10:53 ` Pavel Machek [this message]
2017-04-26 10:53 ` [patch] propagating controls in libv4l2 was " Pavel Machek
2017-04-26 11:13 ` Mauro Carvalho Chehab
2017-04-26 13:23 ` [patch] autogain support for bayer10 format (was Re: [patch] propagating controls in libv4l2) Pavel Machek
2017-04-26 15:43 ` Ivaylo Dimitrov
2017-04-26 22:51 ` Pavel Machek
2017-04-27 5:52 ` Ivaylo Dimitrov
2017-07-13 7:57 ` Pavel Machek
2017-05-03 19:05 ` Russell King - ARM Linux
2017-05-03 19:58 ` Pavel Machek
2017-05-08 22:28 ` [patch, libv4l]: fix integer overflow Pavel Machek
2017-05-09 6:29 ` Hans Verkuil
2017-05-09 6:32 ` Hans Verkuil
2017-05-09 8:02 ` Pavel Machek
2017-05-09 10:59 ` [patch, libv4l]: fix typos Pavel Machek
2017-05-09 11:01 ` [patch, libv4l]: Add support for GRBG10 format conversion Pavel Machek
2017-05-09 11:04 ` [patch, libv4l]: Introduce define for lookup table size Pavel Machek
2017-05-16 11:17 ` Hans Verkuil
2017-05-16 12:45 ` Pavel Machek
2017-05-16 12:56 ` Hans Verkuil
2017-05-16 23:23 ` Pavel Machek
2017-05-19 9:13 ` [libv4l]: How to do 10-bit support? Stand-alone conversions? Pavel Machek
2018-03-16 20:55 ` [RFC, libv4l]: Make libv4l2 usable on devices with complex pipeline Pavel Machek
2018-03-19 9:47 ` Hans Verkuil
2018-03-19 10:23 ` Pavel Machek
2018-03-19 10:47 ` Mauro Carvalho Chehab
2018-03-19 11:11 ` Hans Verkuil
2018-03-19 12:00 ` Pavel Machek
2018-03-19 12:15 ` Hans Verkuil
2018-03-19 12:48 ` Pavel Machek
2018-03-19 13:29 ` Hans Verkuil
2018-03-19 22:18 ` Pavel Machek
2018-03-19 13:45 ` Mauro Carvalho Chehab
2018-03-19 13:26 ` Mauro Carvalho Chehab
2018-03-20 7:50 ` Pavel Machek
2018-05-15 20:01 ` Pavel Machek
2018-05-15 22:03 ` Mauro Carvalho Chehab
2018-05-16 20:53 ` Pavel Machek
2018-06-02 21:01 ` Pavel Machek
2018-06-06 6:18 ` Tomasz Figa
2018-06-06 8:46 ` Pavel Machek
2018-06-06 8:53 ` Tomasz Figa
2018-06-06 10:01 ` Pavel Machek
2018-06-06 16:57 ` Mauro Carvalho Chehab
2018-06-06 21:27 ` Pavel Machek
2018-06-07 12:22 ` [PATCH, " Pavel Machek
2018-06-06 10:51 ` [RFC, " Pavel Machek
2018-06-06 11:16 ` Tomasz Figa
2018-06-06 20:37 ` Pavel Machek
2018-06-06 17:13 ` Mauro Carvalho Chehab
2018-06-06 10:23 ` Pavel Machek
2018-06-07 7:25 ` Pavel Machek
2017-05-09 11:10 ` [patch, libv4l]: fix integer overflow Pavel Machek
2017-05-16 10:42 ` Pavel Machek
2017-05-21 10:33 ` [patch, libv4l]: add sdlcam example for testing digital still camera functionality Pavel Machek
2017-05-26 20:41 ` Pavel Machek
2017-05-27 9:27 ` Hans Verkuil
2017-05-29 6:13 ` Hans Verkuil
2017-05-29 7:32 ` Pavel Machek
2017-05-29 8:02 ` Hans Verkuil
2017-06-14 11:16 ` Sakari Ailus
2017-06-14 20:41 ` Pavel Machek
2017-07-13 8:36 ` Pavel Machek
2017-05-09 8:07 ` [patch, libv4l]: fix integer overflow Pavel Machek
2017-04-30 22:48 ` [patch] autogain support for bayer10 format (was Re: [patch] propagating controls in libv4l2) Pavel Machek
2017-07-13 9:49 ` [patch] propagating controls in libv4l2 was Re: support autofocus / autogain in libv4l2 Pavel Machek
2017-04-26 11:26 ` Mauro Carvalho Chehab
2017-04-29 9:19 ` Pavel Machek
2017-10-21 22:00 ` Camera support, Prague next week, sdlcam Pavel Machek
2017-10-22 7:36 ` Hans Verkuil
2017-10-22 8:31 ` Pavel Machek
2017-10-23 18:54 ` Pavel Machek
2017-10-23 19:24 ` Hans Verkuil
2017-10-23 20:15 ` Sakari Ailus
2017-10-23 21:02 ` Mauro Carvalho Chehab
2017-10-31 21:28 ` Nokia N9: fun with camera Pavel Machek
2017-11-01 6:36 ` Pavel Machek
2017-11-01 15:32 ` Pavel Machek
2017-04-24 22:07 ` support autofocus / autogain in libv4l2 Pavel Machek
2017-04-25 1:57 ` Mauro Carvalho Chehab
2017-04-25 8:20 ` Pavel Machek
2017-04-25 11:23 ` Pavel Machek
2017-04-28 22:00 ` [PATCH v3 1/2] v4l: Add camera voice coil lens control class, current control Pavel Machek
2017-04-29 1:46 ` Mauro Carvalho Chehab
2017-05-12 10:49 ` Sakari Ailus
2017-05-13 11:08 ` Pavel Machek
2017-02-14 12:20 ` [PATCH v3 2/2] ad5820: Use VOICE_COIL_CURRENT control Sakari Ailus
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