Hi all, This is version 3 of the agenda for the media summit. As always, it is subject to change and all times are guesstimates! The media summit will be held at the Holiday Inn which is close to the conference centre where the Embedded Open Source Summit is held: Holiday Inn Prague Congress Centre - Meeting room "E" Na Pankráci 1684/ 15, 140 00 Praha 4-Nusle https://www.ihg.com/holidayinn/hotels/us/en/prague/prgnp/hoteldetail Refreshments (tea/coffee/soda) are available during the day. The meeting room is sponsored by Collabora and Cisco Systems Norway. And lunch is sponsored by Ideas On Board. Many thanks to the sponsors! In-Person Attendees: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> (Intel) Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx> (Ideas On Board) Deborah Brouwer <deborahbrouwer3563@xxxxxxxxx> Mauro Carvalho Chehab <mchehab@xxxxxxxxxx> (Intel) Ricardo Ribalda <ribalda@xxxxxxxxxxxx> (Google) Marco Felsch <m.felsch@xxxxxxxxxxxxxx> (Pengutronix) Sebastian Fricke <sebastian.fricke@xxxxxxxxxxxxx> (Collabora) Martin Hecht <martin.hecht@xxxxxxxx> (Avnet) Jai Luthra <j-luthra@xxxxxx> (TI) Tommaso Merciai <tomm.merciai@xxxxxxxxx> (Avnet) Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx> (Ideas On Board) Andrzej Pietrasiewicz <andrzej.p@xxxxxxxxxxxxx> (Collabora) Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> (Ideas On Board) Michael Roeder <michael.roeder@xxxxxxxx> (Avnet) Niklas Söderlund <niklas.soderlund@xxxxxxxxxxxx> (Ragnatech) Dave Stevenson <dave.stevenson@xxxxxxxxxxxxxxx> (Raspberry Pi) Martin Tůma <tumic@xxxxxxxxxx> (GPXSee) Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx> (Linaro, tentative, after 16:30 only) Hans Verkuil <hverkuil-cisco@xxxxxxxxx> (Cisco Systems Norway) Alain Volmat <alain.volmat@xxxxxxxxxxx> (ST Electronics) Remote Attendees: Nicolas Dufresne <nicolas@xxxxxxxxxxxx> (Collabora, tentative, afternoon only) Hsia-Jun Li <Randy.Li@xxxxxxxxxxxxx> (Synaptics) I will email details on how to join remotely a few days before the media summit starts. If you are listed as attendee (in person or remote) and you can't attend after all, please let me know. If you are listed as presenting a topic during the meeting, then please check if the details are correct. It would be really appreciated if you can post any slides you have before the meeting (just reply to this message with the presentation attached). Agenda: 8:45-9:15: get settled :-) 9:15-9:25: Hans: Quick introduction 9:25-10:15: Daniel Almeida: Rust V4L2 support Discuss the potential blockers as well as the roadmap and priorities for bindings. Present what is currently supported and what isn't in the Rust code for V4L2. Identify potential candidates for new drivers that can be written in Rust. Discuss about maintainership issues related to Rust in V4L2. 10:15-10:30: Break 10:30-11:15 Hans & Hsia-Jun Li: "Add extended fmt and buffer" patch series https://patchwork.linuxtv.org/project/linux-media/cover/20230206043308.28365-1-ayaka@xxxxxxxxxxx/ We've been postponing the work on this, but I think we need to decide how to proceed since pixel formats and single vs multi planar is getting to be a nightmare. More details from Hsia-Jun Li: 1. v4l2 header would only maintain the codec format and pixel format in bus. 2. the pixel formats would be maintained by the DirectRender, those M variant would not be supported in the new extend pixel format API. 3. The number of plane for a pixel format would also responds for its data layout. Ex. NV12 = 2 planes(luma, chroma), I420 = 3 planes(Y, U, V). 4. Userspace that supports new extend API could access those driver didn't adapt the new API, kernel would have a backward compatible layer. While the opposite backward compatible is not offered (old API userspace can't access the driver support the new API). [optional part] 5. An alloc flag would be introduced for allocating those M variant buf. https://lore.kernel.org/lkml/20230322105226.122467-1-randy.li@xxxxxxxxxxxxx/ 6. Stateless codec format would be a modifier to the stateful codec format. We could support different packing mode here. 11:15-11:30: Break 11:30-12:15: Andrzej Pietrasiewicz: Stateless Encoders: VP8 - Introduction to stateless encoders and previous work in this area https://github.com/bootlin/linux/tree/hantro/h264-encoding-v5.11 https://lore.kernel.org/linux-arm-kernel/20230309125651.23911-1-andrzej.p@xxxxxxxxxxxxx/T/ - High level decisions - Rate control - VP8 uAPI - Challenges 12:15-13:30: Lunch 13:30-14:00: Ricardo Ribalda Delgado: KCAM update I would like to share the progress on KCAM from our end. I am also trying to collect all the requirements that we are getting from vendors regarding V4L2. 14:00-14:45: Sakari: generic line-based metadata formats: https://lore.kernel.org/linux-media/20230505215257.60704-1-sakari.ailus@xxxxxxxxxxxxxxx/T/#t 14:45-??:??: Mauro & sub-maintainers: Subsystem development process How to improve it? How do we get more maintainers? It's not working very well at the moment. Mauro will present how the media CI works today. Hans will present how the daily build scripts work. Can this be harmonized? Final short topic: Hans: Should we keep the media summit together with the ELCE conference? Or organize it separately, and ask a company like Cisco, Intel or Collabora to organize a room. What would work best? Anything to improve on this? We have the room until 18:30, but (fingers crossed) I hope to finish before that. The "Add extended fmt and buffer" and the "Subsystem development process" are *very* hard to predict. I want to limit the initial discussion of the that first topic to 45-60 minutes, and continue (if needed) in the afternoon after the discussion about the subsystem development process. We will have see how it goes. Please reply with corrections, questions, etc. to this email. I'll update the agenda over time. Regards, Hans
