Re: [media-workshop] [ANN] Final agenda for the V4L/DVB mini-summit

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

Hi Mauro,

On Tuesday 22 October 2013 11:42:37 Mauro Carvalho Chehab wrote:
> Em Tue, 22 Oct 2013 09:47:02 +0000 Hans Verkuil escreveu:
> > Here is the final schedule. I moved a few topics around at the request of
> > Laurent and to make it a better fit for the break times.
> > 
> > Please note that the LED topic has moved to a slightly later timeslot.
> > 
> > 
> > 
> > We plan to start at 9:00 and we have the Glamis room until 18:00.
> > 
> > The schedule is as follows:
> > 
> > 9:00 Welcome/Introduction
> > 
> > 9:10 Mauro Carvalho Chehab
> > 
> > - Better integration between DVB and V4L2, including starting using the
> >   media controller API on DVB side too.
> 
> Michael requested to have this presentation on a latter time, in order for
> him to also participate on it.
> 
> Also, as this is media controller related, I think it makes sense to have
> Laurent participating on those discussions.

I will very likely not be able to make it to the V4L/DVB mini-summit before 
11:30, and certainly not before 10:30. I will miss whatever is moved to the 
9:10 slot.

> >   30 min
> > 
> > 9:40 Kieran Kunhya
> > 
> > - (3G/HD-)SDI multiplexed raw format
> > 
> >   This is a professional interface used in broadcasting and CCTV.
> >   The most serious issue is that many vendors provide Linux drivers with
> >   V4L2 and ALSA - which is not acceptable for maintaining lipsync, let
> >   alone maintaining the exact relationship between audio samples and
> >   video that SDI provides.
> >   
> >   Some other issues are mentioned here: https://wiki.videolan.org/SDI_API/
> >   The wiki page has a very loose proposal for an API, though perhaps the
> >   per-line idea is ambitious at this stage. Field or frame capture is
> >   more realistic.
> > 
> > 10:00 Break
> > 
> > 10:30 Ricardo Ribalda Delgado, Sylwester Nawrocki
> > 
> > - Support for multiple rectangle cropping
> > 
> >   See thread: http://www.spinics.net/lists/linux-media/msg67824.html
> > 
> > 10:50 Sylwester Nawrocki
> > 
> > - LED flash support
> > 
> > 11:10 Hans Verkuil
> > 
> > - Colorspace: limited/full range
> > Draft presentation for all these topics:
> > http://hverkuil.home.xs4all.nl/presentations/summit2013.odp
> > 
> > 11:20 Hans Verkuil
> > 
> > - VIDIOC_TRY_FMT shouldn't return -EINVAL when an unsupported pixelformat
> >   is provided, but in practice video capture board tend to do that, while
> >   webcam drivers tend to map it silently to a valid pixelformat. Some
> >   applications rely on the -EINVAL error code.
> >   
> >   We need to decide how to adjust the spec. I propose to just say that
> >   some drivers will map it silently and others will return -EINVAL and
> >   that you don't know what a driver will do. Also specify that an
> >   unsupported pixelformat is the only reason why TRY_FMT might return
> >   -EINVAL.
> >   
> >   Alternatively we might want to specify explicitly that EINVAL should be
> >   returned for video capture devices (i.e. devices supporting S_STD or
> >   S_DV_TIMINGS) and 0 for all others.
> > 
> > 11:40 Hans Verkuil
> > 
> > - Decide on how v4l2 support libraries should be organized. There is code
> >   for handling raw-to-sliced VBI decoding, ALSA looping, finding
> >   associated video/alsa nodes and for TV frequency tables. We should
> >   decide how that should be organized into libraries and how they should
> >   be documented. The first two aren't libraries at the moment, but I think
> >   they should be. The last two are libraries but they aren't installed.
> >   Some work is also being done on an improved version of the 'associating
> >   nodes' library that uses the MC if available.
> >
> > 12:00 Lunch
> > 
> > 13:00 Hans Verkuil
> > 
> > - Define the interaction between selection API, ENUM_FRAMESIZES and S_FMT.
> >   See this thread for all the nasty details:
> >   
> >   http://www.spinics.net/lists/linux-media/msg65137.html
> >   
> >   Also see my draft presentation (link above) for more info and proposals.
> 
> I have a speech at LinuxCon Europe between 12:05 and 12:55. I should be
> on lunch after that. So, I'll likely miss this one.
> 
> > 14:00 Laurent Pinchart
> > 
> > - Status update regarding the media controller API usage on ALSA (Mauro
> >   likes to know) and sharing i2c transmitters between V4L2 and DRM (Hans
> >   V. likes to know).
> >
> > 14:10 Sakari Ailus
> > 
> > - Multi-format frames and metadata. Support would be needed on video nodes
> >   and V4L2 subdev nodes. I'll prepare the RFC for the former; the latter
> >   has an RFC here: http://www.spinics.net/lists/linux-media/msg67295.html
> > 
> > 15:00 Break
> > 
> > 15:30 Hugues Fruchet
> > 
> > - How to handle codecs where part of the processing is done in HW and part
> >   in SW?
> > 
> > 17:30 End
> > 
> > 
> > Note: these times are tentative. Some topics will take less time, some
> > will take more time.

-- 
Regards,

Laurent Pinchart