linux-kernel - Re: new libv4l2 (was Re: [PATCH, libv4l]: Make libv4l2 usable on devices with complex pipeline)

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Message-ID: <20180730063122.73a20c55@coco.lan>
Date:   Mon, 30 Jul 2018 06:31:30 -0300
From:   Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
To:     Pavel Machek <pavel@....cz>
Cc:     pali.rohar@...il.com, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com,
        clayton@...ftyguy.net, martijn@...xit.nl,
        sakari.ailus@...ux.intel.com,
        Filip Matijević <filip.matijevic.pz@...il.com>,
        mchehab@...pensource.com, sakari.ailus@....fi,
        linux-media@...r.kernel.org, hans.verkuil@...co.com
Subject: Re: new libv4l2 (was Re: [PATCH, libv4l]: Make libv4l2 usable on
 devices with complex pipeline)

Em Sat, 28 Jul 2018 23:11:10 +0200
Pavel Machek <pavel@....cz> escreveu:

> Hi!
> 
> > > > Add support for opening multiple devices in v4l2_open(), and for
> > > > mapping controls between devices.
> > > > 
> > > > This is necessary for complex devices, such as Nokia N900.
> > > > 
> > > > Signed-off-by: Pavel Machek <pavel@....cz>    
> > > 
> > > Ping?
> > > 
> > > There's a lot of work to do on libv4l2... timely patch handling would
> > > be nice.  
> > 
> > As we're be start working at the new library in order to support
> > complex cameras, and I don't want to prevent you keeping doing your
> > work, IMHO the best way to keep doing it would be to create two
> > libv4l2 forks:  
> 
> BTW.. new library. Was there decision what langauge to use? I know C
> is obvious choice, but while working on libv4l2, I wished it would be
> Rust...
> 
> Rewriting same routine over and over, with slightly different types
> was not too much fun, and it looked like textbook example for
> generics...

Whatever language it uses, the library should provide a standard C API
interface and avoid using libraries that may not be available on
the systems supported by the v4l-utils package, as other packages
and a libv4l-compatible interface should be linked using it.

It should also be something that the existing v4l-utils developers are
familiar with. Right now, we have only C and C++ code inside v4l-utils.

So, I'd say that the language should be either C (the obvious choice)
or C++.

It should also be licensed using the same terms as v4l-utils libraries,
e. g. LGPL 2.1+.

Thanks,
Mauro