On 10/17/19 1:17 PM, Hans Verkuil wrote: > Hi all, > > Since we have three separate half-day sessions for different topics I decided > to split the announcement for this in three emails as well, so these things > can be discussed in separate threads. > > All sessions are in room Terreaux VIP Lounge - Level 0. > There is a maximum of 15 people. > > The third session deals with future V4L2 API work and is on Wednesday afternoon > from 14:00 to 18:00. > > Attendees for this session: > > Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx> > Alexandre Courbot <acourbot@xxxxxxxxxxxx> > Nicolas Dufresne <nicolas@xxxxxxxxxxxx> > Tomasz Figa <tfiga@xxxxxxxxxxxx> > Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx> > Daniel Gomez <daniel@xxxxxxxx> > Dafna Hirschfeld <dafna.hirschfeld@xxxxxxxxxxxxx> > Eugen Hristev <Eugen.Hristev@xxxxxxxxxxxxx> > Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx> > Helen Koike <helen.koike@xxxxxxxxxxxxx> > Jacopo Mondi <jacopo@xxxxxxxxxx> > Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> > Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx> > Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> > Hans Verkuil <hverkuil@xxxxxxxxx> > > That's exactly 15 people, so the room is full. > > If I missed someone, or you are on the list but won't attend after all, then > please let me know asap. > > Agenda: > > The main (only?) point of discussion is Boris' RFC v3 patch series: > > https://patchwork.linuxtv.org/cover/59345/ > > Thank you, Boris, for preparing this v3. Much appreciated! > > Attendees: please review his series before the meeting! > > Tomasz also suggested talking about exiting V4L2 limitations, esp. for > handling complex cameras: > > - combinatorial explosion of /dev/video nodes, > - significant ioctl overhead, > - huge amount of historical legacy making the driver and userspace > implementations overly difficult and prone to repetitive mistakes, > - the above also limiting the flexibility of the API - formats, frame > rates, etc. set using distinct APIs, not covered by Request API, with > non-failure "negotiation hell", etc. > - lack of fences, etc. > > I suspect we won't have time to discuss this. Would some of these topics > be suitable for the libcamera session? > > If someone has other topics (but remember, we only have 4 hours!) > then please reply to this announcement post. I would like to reserve the last 15 minutes of this session to discuss how to proceed. Given the scale of the proposed changes, I believe we will need to organize a 3 day brainstorm session with the core stakeholders to take what is discussed in this session and turn it into a solid API. Ideally we can come up with a place/date for this, and I think this should be soon: either late November/early December or in January/early February. Perhaps the week before FOSDEM? (1 & 2 Feb 2020) Frankly, it would make a nice topic for a FOSDEM presentation anyway :-) Regards, Hans
