Attached you will find the multi selection api slides
Thanks!
On Fri, Oct 18, 2013 at 11:06 AM, Hans Verkuil hverkuil@xs4all.nl wrote:
The ARM kernel agenda came in, and Laurent expects to be available after 12:00 (perhaps even earlier). So I moved all the topics that do not require his presence to the morning.
Laurent, please check if this works for you.
We plan to start at 9:00 and we have the room until 17:30 or 18:00 (to be decided). There are breaks from 10:00-10:30, 12:00-13:00, 15:00-15:30. So we have realistically at best around 6 1/2 hours for actual discussions. And that's filled up completely.
Regards,
HansTopics for the V4L2/DVB mini-summit:
Mauro Carvalho Chehab:
Better integration between DVB and V4L2, including starting using the media controller API on DVB side too.
30 min
Ricardo Ribalda Delgado, Sylwester Nawrocki:
Support for multiple rectangle cropping See thread: http://www.spinics.net/lists/linux-media/msg67824.html
20 min
Sylwester Nawrocki
LED flash support
20 min
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.
20 min
Hans Verkuil: Draft presentation for all these topics: http://hverkuil.home.xs4all.nl/presentations/summit2013.odp
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.
20 min
Colorspace: limited/full range
10 min
(LP?) 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.
60 min
(LP) 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.
30 min
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).
10 min
Hugues Fruchet:
(LP) How to handle codecs where part of the processing is done in HW and part in SW?
2 hours
Sakari Ailus:
(LP) 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
50 min
In principle the agenda is now closed for new topics.
Regards,
Hans
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