Hi all,
We are organizing a media mini-summit on Thursday October 25th in
Edinburgh, Edinburgh International Conference Centre.
If you plan to attend, please let Mauro know. It is open for all, but
we have a limited number of seats.
Name of the room for the summit: TBD
Currently known attendees (please add/remove names as needed):
Sakari Ailus <sakari.ai...@iki.fi>
Mauro Carvalho Chehab <mche...@s-opensource.com>
Ezequiel Garcia <ezequ...@collabora.com>
Michael Ira Krufky <mkru...@linuxtv.org>
Laurent Pinchart <laurent.pinch...@ideasonboard.com>
Ricardo Ribalda Delgado <ricardo.riba...@gmail.com>
Hans Verkuil <hverk...@xs4all.nl>
Sean Young <s...@mess.org>
Agenda (First draft!)
=====================
General remarks: the given start/end times for the various topics are
approximate since it is always hard to predict how long a discussion will take.
If people are attending other summits and those conflict with specific media
topics they want to be part of, then let me know and we can rearrange the
schedule to (hopefully) accommodate that.
9:00-9:15: Introduction (Hans Verkuil)
9:15-9:30: Status of the HDMI CEC kernel support (Hans Verkuil)
Give a quick overview of the status: what has been merged, what is
still pending, what is under development.
9:30-9:45: Save/restore controls from MTD (Ricardo Ribalda Delgado)
Industrial/Scientific sensors usually come with very extensive
calibration information such as: per column gain, list of dead
pixels, temperature sensor offset... etc
We are saving that information on an flash device that is located
by the sensor.
Show how we are integrating that calibration flash with v4l2-ctrl.
And if this feature is useful for someone else and upstream it.
9:45-11:00: Complex Cameras (Mauro Carvalho Chehab)
I expect that we could have something to discuss there about complex
cameras. So, I'd reserve a 50 mins slot for it.
The idea is to discuss about the undergoing work with complex camera
development is happening.
As we're working to merge request API, another topic for discussion
is how to add support for requests on it (or on a separate but related
library).
11:00-11:15: Break
11:15-12:00: Automated Testing (Ezequiel Garcia)
There is a lot of discussion going on around testing,
so it's a good opportunity for us to talk about our
current testing infrastructure.
We are already doing a good job with v4l2-compliance.
Can we do more?
Lunch
13:30-14:30: Stateless Codec userspace (Hans Verkuil)
Support for stateless codecs and Request API should be merged for
4.20, and the next step is to discuss how to organize the userspace
support.
Hopefully by the time the media summit starts we'll have some better
ideas of what we want in this area.
14:30-15:15: Which ioctls should be replaced with better versions? (Hans
Verkuil)
Some parts of the V4L2 API are awkward to use and I think it would be
a good idea to look at possible candidates for that.
Examples are the ioctls that use struct v4l2_buffer: the multiplanar
support is
really horrible, and writing code to support both single and
multiplanar is hard.
We are also running out of fields and the timeval isn't y2038 compliant.
A proof-of-concept is here:
https://git.linuxtv.org/hverkuil/media_tree.git/commit/?h=v4l2-buffer&id=a95549df06d9900f3559afdbb9da06bd4b22d1f3
It's a bit old, but it gives a good impression of what I have in mind.
Another candidate is
VIDIOC_SUBDEV_ENUM_FRAME_INTERVAL/VIDIOC_ENUM_FRAMEINTERVALS:
expressing frame intervals as a fraction is really awkward and so is
the fact
that the subdev and 'normal' ioctls are not the same.
Discuss what possible other ioctls are candidates for a refresh.
15:15-15:30: Break
15:30-16:00: Discuss the media development process
Since we are all here, discuss any issues there may be with the media
subsystem development process. Anything to improve?
16:00-16:15: Wrap up
Create action items (and who will take care of them) if needed.
Summarize and conclude the day.
End of the day: Key Signing Party
Regards,
Hans
