[libcamera-devel] use of v4l2-compat.so

[Nicolas Dufresne]

Le lundi 15 juin 2020 à 11:52 -0400, Nicolas Dufresne a écrit :
> Le lundi 15 juin 2020 à 18:11 +0300, Laurent Pinchart a écrit :
> > On Mon, Jun 15, 2020 at 11:06:45AM -0400, Nicolas Dufresne wrote:
> > > Le lundi 15 juin 2020 à 18:52 +0530, naidu nama a écrit :
> > > > Hi,
> > > > I am able to build the v4l2 directory.I am getting a shared libary
> > > > v4l2-compat.so.How can i use this in my libcamera or how can i test
> > > > that v4l2-compat.so
> > > 
> > > One way is to make sure it's in your library path, and
> > > use LD_PRELOAD=v4l2-compat.so .  Last time I tried it was missing
> > > poll() emulation.
> > 
> > poll() support has been merged, along with several bug fixes. Paul is
> > working on additional fixes, they should hopefully land this week.
> 
> Great ! I confirm it works under GStreamer now:
> 
> LD_LIBRARY_PATH=$(pwd)/build/src/v4l2 LD_PRELOAD=v4l2-compat.so gst-launch-1.0 v4l2src ! glimagesink
> 

Well, it *minimally* works. It seems that it's impossible to pick
resolution different from 160x120, or select JPEG. As for other app,
libv4l2 wrapper don't seem handled, in firefox it does not get used and
it causes chrome to hang at start.

Nicolas