support autofocus / autogain in libv4l2

[Nicolas Dufresne]

Le mardi 25 avril 2017 à 10:08 +0200, Pali Rohár a écrit :
> On Tuesday 25 April 2017 10:05:38 Pavel Machek wrote:
> > > > It would be nice if more than one application could be
> > > > accessing the
> > > > camera at the same time... (I.e. something graphical running
> > > > preview
> > > > then using command line tool to grab a picture.) This one is
> > > > definitely not solveable inside a library...
> > > 
> > > Someone once suggested to have something like pulseaudio for V4L.
> > > For such usage, a server would be interesting. Yet, I would code
> > > it
> > > in a way that applications using libv4l will talk with such
> > > daemon
> > > in a transparent way.
> > 
> > Yes, we need something like pulseaudio for V4L. And yes, we should
> > make it transparent for applications using libv4l.
> 
> IIRC there is already some effort in writing such "video" server
> which
> would support accessing more application into webcam video, like
> pulseaudio server for accessing more applications to microphone
> input.
> 

Because references are nice:

https://blogs.gnome.org/uraeus/2015/06/30/introducing-pulse-video/
https://gstconf.ubicast.tv/videos/camera-sharing-and-sandboxing-with-pinos/

And why the internals are not going to be implemented using GStreamer in the end:
https://gstconf.ubicast.tv/videos/keep-calm-and-refactor-about-the-essence-of-gstreamer/

regards,
Nicolas
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