RE: [ANN] Topics for a media summit in Lyon in October
Hi Laurent, From: Laurent Pinchart Date: Mon, Sep 16, 2019 at 11:51:31 > Hi Angelo, > > On Mon, Sep 16, 2019 at 10:39:56AM +, Angelo Ribeiro wrote: > > On Mon, Sep 16, 2019 at 10:54:51 Laurent Pinchart wrote: > > > On Mon, Sep 16, 2019 at 10:48:51AM +0200, Hans Verkuil wrote: > > > > On 9/16/19 10:40 AM, Jose Abreu wrote: > > > > > From: Hans Verkuil > > > > > Date: Aug/16/2019, 09:06:30 (UTC+00:00) > > > > > > > > > >> Rather then discussing topics for a meeting under the subject > > > > >> 'Lisbon' > > > > >> let's start a new thread referring to the right place :-) > > > > >> > > > > >> I will try to organize a room, either during the ELCE or (if that > > > > >> doesn't > > > > >> work) perhaps on the Thursday afterwards. If that's going to be a > > > > >> problem > > > > >> for someone, please let me know. > > > > >> > > > > >> I do need to know how many people I can expect. I have the following > > > > >> confirmed attendees (and please reply if you are not listed!): > > > > > > > > > > Hi Hans, > > > > > > > > > > It's been a while, hope you are doing well :) > > > > > > > > > > I'm no longer working in media subsystem but my colleagues Angelo and > > > > > Joao would like to attend. > > > > > > > > > > We currently have HDMI and CSI support for our IPs using V4L2 and we > > > > > would like to interact with the community in order to get this > > > > > up-streamed so that we have as many features supported as possible. > > > > > > > > > > Is it possible ? > > > > > > > > Yes. That said, since this is fairly specific and doesn't fall into any > > > > of > > > > the three discussions that we plan (codecs, libcamera, future > > > > developments) > > > > I think it is more useful if I discuss this separately with Angelo and > > > > Joao on Monday or Tuesday afternoon. > > > > > > > > I can definitely discuss HDMI support, and probably give a good stab at > > > > the > > > > CSI support (too bad Sakari won't be there). > > > > > > > > How about we get together after Greg KH's keynote on Monday? > > > > > > I'll try to join as well. I've run into issues in the past with the > > > development process related to an HDMI IP (but on the DRM/KMS side), and > > > I'd like to try and avoid the same mistakes here. > > > > Thanks for the meeting proposal, for me sounds great. > > Currently I'm building a DRM/KMS video pipeline for our HW solution with > > Synopsys DSI IP, that is supported by the dw-mipi-dsi driver. > > Can you share details about the part of the pipeline before the DSI > encoder ? Are there Synopsys IPs there too, or is the DSI encoder > connected to a display controller from the SoC vendor ? There is a video DMA feeding the DSI encoder and the output is driven through a PHY to a panel. > > Also I'm going to support the DesignWare MIPI CSI-2 Host and D-PHY > > that uses V4l2. > > -- > Regards, > > Laurent Pinchart Thanks, Angelo Ribeiro
Re: [ANN] Topics for a media summit in Lyon in October
Hi Angelo, On Mon, Sep 16, 2019 at 10:39:56AM +, Angelo Ribeiro wrote: > On Mon, Sep 16, 2019 at 10:54:51 Laurent Pinchart wrote: > > On Mon, Sep 16, 2019 at 10:48:51AM +0200, Hans Verkuil wrote: > > > On 9/16/19 10:40 AM, Jose Abreu wrote: > > > > From: Hans Verkuil > > > > Date: Aug/16/2019, 09:06:30 (UTC+00:00) > > > > > > > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > > > >> let's start a new thread referring to the right place :-) > > > >> > > > >> I will try to organize a room, either during the ELCE or (if that > > > >> doesn't > > > >> work) perhaps on the Thursday afterwards. If that's going to be a > > > >> problem > > > >> for someone, please let me know. > > > >> > > > >> I do need to know how many people I can expect. I have the following > > > >> confirmed attendees (and please reply if you are not listed!): > > > > > > > > Hi Hans, > > > > > > > > It's been a while, hope you are doing well :) > > > > > > > > I'm no longer working in media subsystem but my colleagues Angelo and > > > > Joao would like to attend. > > > > > > > > We currently have HDMI and CSI support for our IPs using V4L2 and we > > > > would like to interact with the community in order to get this > > > > up-streamed so that we have as many features supported as possible. > > > > > > > > Is it possible ? > > > > > > Yes. That said, since this is fairly specific and doesn't fall into any of > > > the three discussions that we plan (codecs, libcamera, future > > > developments) > > > I think it is more useful if I discuss this separately with Angelo and > > > Joao on Monday or Tuesday afternoon. > > > > > > I can definitely discuss HDMI support, and probably give a good stab at > > > the > > > CSI support (too bad Sakari won't be there). > > > > > > How about we get together after Greg KH's keynote on Monday? > > > > I'll try to join as well. I've run into issues in the past with the > > development process related to an HDMI IP (but on the DRM/KMS side), and > > I'd like to try and avoid the same mistakes here. > > Thanks for the meeting proposal, for me sounds great. > Currently I'm building a DRM/KMS video pipeline for our HW solution with > Synopsys DSI IP, that is supported by the dw-mipi-dsi driver. Can you share details about the part of the pipeline before the DSI encoder ? Are there Synopsys IPs there too, or is the DSI encoder connected to a display controller from the SoC vendor ? > Also I'm going to support the DesignWare MIPI CSI-2 Host and D-PHY > that uses V4l2. -- Regards, Laurent Pinchart
RE: [ANN] Topics for a media summit in Lyon in October
From: Laurent Pinchart Date: Mon, Sep 16, 2019 at 10:54:51 > On Mon, Sep 16, 2019 at 10:48:51AM +0200, Hans Verkuil wrote: > > On 9/16/19 10:40 AM, Jose Abreu wrote: > > > From: Hans Verkuil > > > Date: Aug/16/2019, 09:06:30 (UTC+00:00) > > > > > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > > >> let's start a new thread referring to the right place :-) > > >> > > >> I will try to organize a room, either during the ELCE or (if that doesn't > > >> work) perhaps on the Thursday afterwards. If that's going to be a problem > > >> for someone, please let me know. > > >> > > >> I do need to know how many people I can expect. I have the following > > >> confirmed attendees (and please reply if you are not listed!): > > > > > > Hi Hans, > > > > > > It's been a while, hope you are doing well :) > > > > > > I'm no longer working in media subsystem but my colleagues Angelo and > > > Joao would like to attend. > > > > > > We currently have HDMI and CSI support for our IPs using V4L2 and we > > > would like to interact with the community in order to get this > > > up-streamed so that we have as many features supported as possible. > > > > > > Is it possible ? > > > > Yes. That said, since this is fairly specific and doesn't fall into any of > > the three discussions that we plan (codecs, libcamera, future developments) > > I think it is more useful if I discuss this separately with Angelo and > > Joao on Monday or Tuesday afternoon. > > > > I can definitely discuss HDMI support, and probably give a good stab at the > > CSI support (too bad Sakari won't be there). > > > > How about we get together after Greg KH's keynote on Monday? > > I'll try to join as well. I've run into issues in the past with the > development process related to an HDMI IP (but on the DRM/KMS side), and > I'd like to try and avoid the same mistakes here. > > -- > Regards, > > Laurent Pinchart Hi, Thanks for the meeting proposal, for me sounds great. Currently I'm building a DRM/KMS video pipeline for our HW solution with Synopsys DSI IP, that is supported by the dw-mipi-dsi driver. Also I'm going to support the DesignWare MIPI CSI-2 Host and D-PHY that uses V4l2. Regards, Angelo Ribeiro
Re: [ANN] Topics for a media summit in Lyon in October
On Mon, Sep 16, 2019 at 10:48:51AM +0200, Hans Verkuil wrote: > On 9/16/19 10:40 AM, Jose Abreu wrote: > > From: Hans Verkuil > > Date: Aug/16/2019, 09:06:30 (UTC+00:00) > > > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > >> let's start a new thread referring to the right place :-) > >> > >> I will try to organize a room, either during the ELCE or (if that doesn't > >> work) perhaps on the Thursday afterwards. If that's going to be a problem > >> for someone, please let me know. > >> > >> I do need to know how many people I can expect. I have the following > >> confirmed attendees (and please reply if you are not listed!): > > > > Hi Hans, > > > > It's been a while, hope you are doing well :) > > > > I'm no longer working in media subsystem but my colleagues Angelo and > > Joao would like to attend. > > > > We currently have HDMI and CSI support for our IPs using V4L2 and we > > would like to interact with the community in order to get this > > up-streamed so that we have as many features supported as possible. > > > > Is it possible ? > > Yes. That said, since this is fairly specific and doesn't fall into any of > the three discussions that we plan (codecs, libcamera, future developments) > I think it is more useful if I discuss this separately with Angelo and > Joao on Monday or Tuesday afternoon. > > I can definitely discuss HDMI support, and probably give a good stab at the > CSI support (too bad Sakari won't be there). > > How about we get together after Greg KH's keynote on Monday? I'll try to join as well. I've run into issues in the past with the development process related to an HDMI IP (but on the DRM/KMS side), and I'd like to try and avoid the same mistakes here. -- Regards, Laurent Pinchart
Re: [ANN] Topics for a media summit in Lyon in October
On 9/16/19 10:40 AM, Jose Abreu wrote: > From: Hans Verkuil > Date: Aug/16/2019, 09:06:30 (UTC+00:00) > >> Rather then discussing topics for a meeting under the subject 'Lisbon' >> let's start a new thread referring to the right place :-) >> >> I will try to organize a room, either during the ELCE or (if that doesn't >> work) perhaps on the Thursday afterwards. If that's going to be a problem >> for someone, please let me know. >> >> I do need to know how many people I can expect. I have the following >> confirmed attendees (and please reply if you are not listed!): > > Hi Hans, > > It's been a while, hope you are doing well :) > > I'm no longer working in media subsystem but my colleagues Angelo and > Joao would like to attend. > > We currently have HDMI and CSI support for our IPs using V4L2 and we > would like to interact with the community in order to get this > up-streamed so that we have as many features supported as possible. > > Is it possible ? Yes. That said, since this is fairly specific and doesn't fall into any of the three discussions that we plan (codecs, libcamera, future developments) I think it is more useful if I discuss this separately with Angelo and Joao on Monday or Tuesday afternoon. I can definitely discuss HDMI support, and probably give a good stab at the CSI support (too bad Sakari won't be there). How about we get together after Greg KH's keynote on Monday? Regards, Hans
RE: [ANN] Topics for a media summit in Lyon in October
From: Hans Verkuil Date: Aug/16/2019, 09:06:30 (UTC+00:00) > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): Hi Hans, It's been a while, hope you are doing well :) I'm no longer working in media subsystem but my colleagues Angelo and Joao would like to attend. We currently have HDMI and CSI support for our IPs using V4L2 and we would like to interact with the community in order to get this up-streamed so that we have as many features supported as possible. Is it possible ? --- Thanks, Jose Miguel Abreu
Re: [ANN] Topics for a media summit in Lyon in October
Hi, On Fri, 13 Sep 2019 at 13:27, Hans Verkuil wrote: > > On 9/3/19 9:21 AM, Hans Verkuil wrote: > > Hi all, > > > > I've decided to hold the meeting during the ELCE and not on Thursday. > > Two key people can't be there on Thursday and some travel back Thursday > > evening and so would have to leave early. > > > > Looking at the schedule I propose instead to have one meeting on > > Tuesday morning concentrating on finalizing the codec support. > > > > On Wednesday we have a second meeting for libcamera (morning) and looking > > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > > complex camera pipelines (afternoon). > > > > Laurent, it would make sense if you or one of the other libcamera devs is > > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > > agenda for that meeting? > > > > I plan on leaving Thursday afternoon, so we have the option to continue the > > talks around that last topic on Thursday morning. > > > > I have no idea where we will hold these meetings since I've no idea > > what the conference center looks like and if they have suitable places > > for doing something like this. So I'll look around on the Monday and > > mail the details of where to meet then. > > Good news: the Linux Foundation found a room for us, for both the Tuesday > morning (8-12AM) and the whole of Wednesday (8AM-6PM). > > The room is: Terreaux VIP Lounge - Level 0 > It's boardroom seating for 15, screen & Projector, 3 power strips on the > tables. > > Many thanks to the LF for hosting this for us! > > Regards, > > Hans > I will be in the ELCE for the first time and since I've also started to work recently with Ricardo Ribalda and with industrial cameras (v4l2, sensors, encoders...) I would love to attend all the meetings: codecs, libcamera, and V4L2 development. > > > > Confirmed attendees: > > > > Boris Brezillon > > Alexandre Courbot > > Nicolas Dufresne > > Tomasz Figa > > Ezequiel Garcia > > Eugen Hristev > > Paul Kocialkowski > > Helen Koike > > Jacopo Mondi > > Laurent Pinchart > > Hans Verkuil > > > > If you are not on this list, but want to join, please let me know. > > > > Since this is really three half-day meetings, each with a different > > topic, please let me know which of those half-day meetings you want > > to attend. > > > > Regards, > > > > Hans > > > > On 8/28/19 12:55 PM, Hans Verkuil wrote: > >> On 8/16/19 10:06 AM, Hans Verkuil wrote: > >>> Rather then discussing topics for a meeting under the subject 'Lisbon' > >>> let's start a new thread referring to the right place :-) > >>> > >>> I will try to organize a room, either during the ELCE or (if that doesn't > >>> work) perhaps on the Thursday afterwards. If that's going to be a problem > >>> for someone, please let me know. > >> > >> I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to > >> take > >> that room, but if a lot of people who want to come, will already have left > >> on the Thursday, then there is no point in me reserving this room. > >> > >> So if you are unable to attend on Thursday, then please let me know asap! > >> > >> If Thursday is no problem, then I wanted to have more informal meetings > >> somewhere in the conference center during the morning, and after lunch > >> use the room. > >> > >> If Thursday is a no-go, then we will just have to find a place inside > >> the conference center during the ELCE. > >> > >> Regards, > >> > >> Hans > >> > >>> > >>> I do need to know how many people I can expect. I have the following > >>> confirmed attendees (and please reply if you are not listed!): > >>> > >>> Alexandre Courbot > >>> Tomasz Figa > >>> Jacopo Mondi > >>> Laurent Pinchart > >>> Hans Verkuil > >>> > >>> I know there were more who mentioned on irc that they would attend, > >>> but it is easier to keep track if I have it in an email. > >>> > >>> Topics posted under the previous thread: > >>> > >>> Tomasz: > >>> > >>> I would want to discuss various v4l2_buffer improvements, e.g. > >>> - DMA-buf import with plane offsets, > >>> - unifying the buffer structs for M and non-M formats, > >>> - ability to import different FDs with offsets for non-M formats if the > >>> layout matches driver expectations, etc. > >>> > >>> Besides that, I would be interested in the general idea on handling > >>> complex cameras in the Linux kernel in spite of the remaining V4L2 > >>> limitations, e.g. > >>> - 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. > >>> > >>> Jacopo: > >>> > >>> Apart from discussing libcamera and hope we could kick
Re: [ANN] Topics for a media summit in Lyon in October
On 9/3/19 9:21 AM, Hans Verkuil wrote: > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. Good news: the Linux Foundation found a room for us, for both the Tuesday morning (8-12AM) and the whole of Wednesday (8AM-6PM). The room is: Terreaux VIP Lounge - Level 0 It's boardroom seating for 15, screen & Projector, 3 power strips on the tables. Many thanks to the LF for hosting this for us! Regards, Hans > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. > > Since this is really three half-day meetings, each with a different > topic, please let me know which of those half-day meetings you want > to attend. > > Regards, > > Hans > > On 8/28/19 12:55 PM, Hans Verkuil wrote: >> On 8/16/19 10:06 AM, Hans Verkuil wrote: >>> Rather then discussing topics for a meeting under the subject 'Lisbon' >>> let's start a new thread referring to the right place :-) >>> >>> I will try to organize a room, either during the ELCE or (if that doesn't >>> work) perhaps on the Thursday afterwards. If that's going to be a problem >>> for someone, please let me know. >> >> I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take >> that room, but if a lot of people who want to come, will already have left >> on the Thursday, then there is no point in me reserving this room. >> >> So if you are unable to attend on Thursday, then please let me know asap! >> >> If Thursday is no problem, then I wanted to have more informal meetings >> somewhere in the conference center during the morning, and after lunch >> use the room. >> >> If Thursday is a no-go, then we will just have to find a place inside >> the conference center during the ELCE. >> >> Regards, >> >> Hans >> >>> >>> I do need to know how many people I can expect. I have the following >>> confirmed attendees (and please reply if you are not listed!): >>> >>> Alexandre Courbot >>> Tomasz Figa >>> Jacopo Mondi >>> Laurent Pinchart >>> Hans Verkuil >>> >>> I know there were more who mentioned on irc that they would attend, >>> but it is easier to keep track if I have it in an email. >>> >>> Topics posted under the previous thread: >>> >>> Tomasz: >>> >>> I would want to discuss various v4l2_buffer improvements, e.g. >>> - DMA-buf import with plane offsets, >>> - unifying the buffer structs for M and non-M formats, >>> - ability to import different FDs with offsets for non-M formats if the >>> layout matches driver expectations, etc. >>> >>> Besides that, I would be interested in the general idea on handling >>> complex cameras in the Linux kernel in spite of the remaining V4L2 >>> limitations, e.g. >>> - 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. >>> >>> Jacopo: >>> >>> Apart from discussing libcamera and hope we could kickstart a review of >>> its API, I would like to re-start discussing multiplexed stream support, >>> but that would require Sakari to be there, something I'm not certain >>> about. Sakari? >>> >>> Alexandre: >>> >>> If Collabora/Bootlin is there, I'd certainly want to discuss stateless >>> codecs, in particular m2m codec helpers and finalize the specification >>> in general. >>> >>> Regards, >>> >>> Hans >>> >> >
Re: [ANN] Topics for a media summit in Lyon in October
Hi Hans, On Tue, 03 Sep 2019 09:21:43 +0200, Hans Verkuil wrote: > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. I would like to attend the meeting about codec support. Michael
Re: [ANN] Topics for a media summit in Lyon in October
On 9/3/19 11:35 AM, Laurent Pinchart wrote: > Hi Hans, > > On Tue, Sep 03, 2019 at 09:21:43AM +0200, Hans Verkuil wrote: >> Hi all, >> >> I've decided to hold the meeting during the ELCE and not on Thursday. >> Two key people can't be there on Thursday and some travel back Thursday >> evening and so would have to leave early. >> >> Looking at the schedule I propose instead to have one meeting on >> Tuesday morning concentrating on finalizing the codec support. >> >> On Wednesday we have a second meeting for libcamera (morning) and looking >> at future V4L2 developments such as v4l2_ext_buffer/format, Request API and >> complex camera pipelines (afternoon). >> >> Laurent, it would make sense if you or one of the other libcamera devs is >> 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an >> agenda for that meeting? >> >> I plan on leaving Thursday afternoon, so we have the option to continue the >> talks around that last topic on Thursday morning. >> >> I have no idea where we will hold these meetings since I've no idea >> what the conference center looks like and if they have suitable places >> for doing something like this. So I'll look around on the Monday and >> mail the details of where to meet then. >> >> Confirmed attendees: >> >> Boris Brezillon >> Alexandre Courbot >> Nicolas Dufresne >> Tomasz Figa >> Ezequiel Garcia >> Eugen Hristev >> Paul Kocialkowski >> Helen Koike >> Jacopo Mondi >> Laurent Pinchart >> Hans Verkuil >> >> If you are not on this list, but want to join, please let me know. >> >> Since this is really three half-day meetings, each with a different >> topic, please let me know which of those half-day meetings you want >> to attend. > > The schedule looks good to me. I may skip the codec part, but will be > there on Wednesday. > > On the libcamera side, I was wondering if we should announce the meeting > beforehand (possibly on the libcamera-devel mailing list and/or during > Jacopo's talk on Tuesday afternoon). We don't have a room secured, right > ? Did the LF say they have no room available during the conference ? Correct, there are no rooms available during the conference. It's also why I wouldn't announce the meeting since I have no idea where we can meet and how many people would fit in whatever place we'll find. It might be that when we get to the venue it turns out that there are many areas where you can have an informal meeting, or it might be a lot more difficult. If it turns out to be easy to find a space for this, then it can be announced during the libcamera talk. We'll find out on the Monday. Regards, Hans
Re: [ANN] Topics for a media summit in Lyon in October
Hi Hans, On Tue, Sep 03, 2019 at 09:21:43AM +0200, Hans Verkuil wrote: > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. > > Since this is really three half-day meetings, each with a different > topic, please let me know which of those half-day meetings you want > to attend. The schedule looks good to me. I may skip the codec part, but will be there on Wednesday. On the libcamera side, I was wondering if we should announce the meeting beforehand (possibly on the libcamera-devel mailing list and/or during Jacopo's talk on Tuesday afternoon). We don't have a room secured, right ? Did the LF say they have no room available during the conference ? -- Regards, Laurent Pinchart
Re: [ANN] Topics for a media summit in Lyon in October
Hi Hans, Thanks for organizing this. On 2019-09-03 09:21:43 +0200, Hans Verkuil wrote: > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. I will be there. > > Since this is really three half-day meetings, each with a different > topic, please let me know which of those half-day meetings you want > to attend. > > Regards, > > Hans > > On 8/28/19 12:55 PM, Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > >> let's start a new thread referring to the right place :-) > >> > >> I will try to organize a room, either during the ELCE or (if that doesn't > >> work) perhaps on the Thursday afterwards. If that's going to be a problem > >> for someone, please let me know. > > > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > > that room, but if a lot of people who want to come, will already have left > > on the Thursday, then there is no point in me reserving this room. > > > > So if you are unable to attend on Thursday, then please let me know asap! > > > > If Thursday is no problem, then I wanted to have more informal meetings > > somewhere in the conference center during the morning, and after lunch > > use the room. > > > > If Thursday is a no-go, then we will just have to find a place inside > > the conference center during the ELCE. > > > > Regards, > > > > Hans > > > >> > >> I do need to know how many people I can expect. I have the following > >> confirmed attendees (and please reply if you are not listed!): > >> > >> Alexandre Courbot > >> Tomasz Figa > >> Jacopo Mondi > >> Laurent Pinchart > >> Hans Verkuil > >> > >> I know there were more who mentioned on irc that they would attend, > >> but it is easier to keep track if I have it in an email. > >> > >> Topics posted under the previous thread: > >> > >> Tomasz: > >> > >> I would want to discuss various v4l2_buffer improvements, e.g. > >> - DMA-buf import with plane offsets, > >> - unifying the buffer structs for M and non-M formats, > >> - ability to import different FDs with offsets for non-M formats if the > >> layout matches driver expectations, etc. > >> > >> Besides that, I would be interested in the general idea on handling > >> complex cameras in the Linux kernel in spite of the remaining V4L2 > >> limitations, e.g. > >> - 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. > >> > >> Jacopo: > >> > >> Apart from discussing libcamera and hope we could kickstart a review of > >> its API, I would like to re-start discussing multiplexed stream support, > >> but that would require Sakari to be there, something I'm not certain > >> about. Sakari? > >> > >> Alexandre: > >> > >> If Collabora/Bootlin is there, I'd certainly want to discuss stateless > >> codecs, in particular m2m codec helpers and finalize the specification > >> in general. > >> > >> Regards, > >> > >>Hans > >> > > > -- Regards, Niklas Söderlund
Re: [ANN] Topics for a media summit in Lyon in October
On Tue, Sep 3, 2019 at 4:21 PM Hans Verkuil wrote: > > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. > > Since this is really three half-day meetings, each with a different > topic, please let me know which of those half-day meetings you want > to attend. Thanks Hans! I should be there on all the 3 meetings. > > Regards, > > Hans > > On 8/28/19 12:55 PM, Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > >> let's start a new thread referring to the right place :-) > >> > >> I will try to organize a room, either during the ELCE or (if that doesn't > >> work) perhaps on the Thursday afterwards. If that's going to be a problem > >> for someone, please let me know. > > > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > > that room, but if a lot of people who want to come, will already have left > > on the Thursday, then there is no point in me reserving this room. > > > > So if you are unable to attend on Thursday, then please let me know asap! > > > > If Thursday is no problem, then I wanted to have more informal meetings > > somewhere in the conference center during the morning, and after lunch > > use the room. > > > > If Thursday is a no-go, then we will just have to find a place inside > > the conference center during the ELCE. > > > > Regards, > > > > Hans > > > >> > >> I do need to know how many people I can expect. I have the following > >> confirmed attendees (and please reply if you are not listed!): > >> > >> Alexandre Courbot > >> Tomasz Figa > >> Jacopo Mondi > >> Laurent Pinchart > >> Hans Verkuil > >> > >> I know there were more who mentioned on irc that they would attend, > >> but it is easier to keep track if I have it in an email. > >> > >> Topics posted under the previous thread: > >> > >> Tomasz: > >> > >> I would want to discuss various v4l2_buffer improvements, e.g. > >> - DMA-buf import with plane offsets, > >> - unifying the buffer structs for M and non-M formats, > >> - ability to import different FDs with offsets for non-M formats if the > >> layout matches driver expectations, etc. > >> > >> Besides that, I would be interested in the general idea on handling > >> complex cameras in the Linux kernel in spite of the remaining V4L2 > >> limitations, e.g. > >> - 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. > >> > >> Jacopo: > >> > >> Apart from discussing libcamera and hope we could kickstart a review of > >> its API, I would like to re-start discussing multiplexed stream support, > >> but that would require Sakari to be there, something I'm not certain > >> about. Sakari? > >> > >> Alexandre: > >> > >> If Collabora/Bootlin is there, I'd certainly want to discuss stateless > >> codecs, in particular m2m codec helpers and finalize the specification > >> in general. > >> > >> Regards, > >> > >> Hans > >> > > >
Re: [ANN] Topics for a media summit in Lyon in October
On Tue, Sep 3, 2019 at 4:21 PM Hans Verkuil wrote: > > Hi all, > > I've decided to hold the meeting during the ELCE and not on Thursday. > Two key people can't be there on Thursday and some travel back Thursday > evening and so would have to leave early. > > Looking at the schedule I propose instead to have one meeting on > Tuesday morning concentrating on finalizing the codec support. > > On Wednesday we have a second meeting for libcamera (morning) and looking > at future V4L2 developments such as v4l2_ext_buffer/format, Request API and > complex camera pipelines (afternoon). > > Laurent, it would make sense if you or one of the other libcamera devs is > 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an > agenda for that meeting? > > I plan on leaving Thursday afternoon, so we have the option to continue the > talks around that last topic on Thursday morning. > > I have no idea where we will hold these meetings since I've no idea > what the conference center looks like and if they have suitable places > for doing something like this. So I'll look around on the Monday and > mail the details of where to meet then. > > Confirmed attendees: > > Boris Brezillon > Alexandre Courbot > Nicolas Dufresne > Tomasz Figa > Ezequiel Garcia > Eugen Hristev > Paul Kocialkowski > Helen Koike > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > If you are not on this list, but want to join, please let me know. > > Since this is really three half-day meetings, each with a different > topic, please let me know which of those half-day meetings you want > to attend. Hi Hans, I plan to be here at least for the codec and V4L2 developments meetings. Thanks, Alex. > > Regards, > > Hans > > On 8/28/19 12:55 PM, Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > >> Rather then discussing topics for a meeting under the subject 'Lisbon' > >> let's start a new thread referring to the right place :-) > >> > >> I will try to organize a room, either during the ELCE or (if that doesn't > >> work) perhaps on the Thursday afterwards. If that's going to be a problem > >> for someone, please let me know. > > > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > > that room, but if a lot of people who want to come, will already have left > > on the Thursday, then there is no point in me reserving this room. > > > > So if you are unable to attend on Thursday, then please let me know asap! > > > > If Thursday is no problem, then I wanted to have more informal meetings > > somewhere in the conference center during the morning, and after lunch > > use the room. > > > > If Thursday is a no-go, then we will just have to find a place inside > > the conference center during the ELCE. > > > > Regards, > > > > Hans > > > >> > >> I do need to know how many people I can expect. I have the following > >> confirmed attendees (and please reply if you are not listed!): > >> > >> Alexandre Courbot > >> Tomasz Figa > >> Jacopo Mondi > >> Laurent Pinchart > >> Hans Verkuil > >> > >> I know there were more who mentioned on irc that they would attend, > >> but it is easier to keep track if I have it in an email. > >> > >> Topics posted under the previous thread: > >> > >> Tomasz: > >> > >> I would want to discuss various v4l2_buffer improvements, e.g. > >> - DMA-buf import with plane offsets, > >> - unifying the buffer structs for M and non-M formats, > >> - ability to import different FDs with offsets for non-M formats if the > >> layout matches driver expectations, etc. > >> > >> Besides that, I would be interested in the general idea on handling > >> complex cameras in the Linux kernel in spite of the remaining V4L2 > >> limitations, e.g. > >> - 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. > >> > >> Jacopo: > >> > >> Apart from discussing libcamera and hope we could kickstart a review of > >> its API, I would like to re-start discussing multiplexed stream support, > >> but that would require Sakari to be there, something I'm not certain > >> about. Sakari? > >> > >> Alexandre: > >> > >> If Collabora/Bootlin is there, I'd certainly want to discuss stateless > >> codecs, in particular m2m codec helpers and finalize the specification > >> in general. > >> > >> Regards, > >> > >> Hans > >> > > >
Re: [ANN] Topics for a media summit in Lyon in October
Hi all, I've decided to hold the meeting during the ELCE and not on Thursday. Two key people can't be there on Thursday and some travel back Thursday evening and so would have to leave early. Looking at the schedule I propose instead to have one meeting on Tuesday morning concentrating on finalizing the codec support. On Wednesday we have a second meeting for libcamera (morning) and looking at future V4L2 developments such as v4l2_ext_buffer/format, Request API and complex camera pipelines (afternoon). Laurent, it would make sense if you or one of the other libcamera devs is 'chairing' the libcamera meeting. Do you agree? If so, can you prepare an agenda for that meeting? I plan on leaving Thursday afternoon, so we have the option to continue the talks around that last topic on Thursday morning. I have no idea where we will hold these meetings since I've no idea what the conference center looks like and if they have suitable places for doing something like this. So I'll look around on the Monday and mail the details of where to meet then. Confirmed attendees: Boris Brezillon Alexandre Courbot Nicolas Dufresne Tomasz Figa Ezequiel Garcia Eugen Hristev Paul Kocialkowski Helen Koike Jacopo Mondi Laurent Pinchart Hans Verkuil If you are not on this list, but want to join, please let me know. Since this is really three half-day meetings, each with a different topic, please let me know which of those half-day meetings you want to attend. Regards, Hans On 8/28/19 12:55 PM, Hans Verkuil wrote: > On 8/16/19 10:06 AM, Hans Verkuil wrote: >> Rather then discussing topics for a meeting under the subject 'Lisbon' >> let's start a new thread referring to the right place :-) >> >> I will try to organize a room, either during the ELCE or (if that doesn't >> work) perhaps on the Thursday afterwards. If that's going to be a problem >> for someone, please let me know. > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > that room, but if a lot of people who want to come, will already have left > on the Thursday, then there is no point in me reserving this room. > > So if you are unable to attend on Thursday, then please let me know asap! > > If Thursday is no problem, then I wanted to have more informal meetings > somewhere in the conference center during the morning, and after lunch > use the room. > > If Thursday is a no-go, then we will just have to find a place inside > the conference center during the ELCE. > > Regards, > > Hans > >> >> I do need to know how many people I can expect. I have the following >> confirmed attendees (and please reply if you are not listed!): >> >> Alexandre Courbot >> Tomasz Figa >> Jacopo Mondi >> Laurent Pinchart >> Hans Verkuil >> >> I know there were more who mentioned on irc that they would attend, >> but it is easier to keep track if I have it in an email. >> >> Topics posted under the previous thread: >> >> Tomasz: >> >> I would want to discuss various v4l2_buffer improvements, e.g. >> - DMA-buf import with plane offsets, >> - unifying the buffer structs for M and non-M formats, >> - ability to import different FDs with offsets for non-M formats if the >> layout matches driver expectations, etc. >> >> Besides that, I would be interested in the general idea on handling >> complex cameras in the Linux kernel in spite of the remaining V4L2 >> limitations, e.g. >> - 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. >> >> Jacopo: >> >> Apart from discussing libcamera and hope we could kickstart a review of >> its API, I would like to re-start discussing multiplexed stream support, >> but that would require Sakari to be there, something I'm not certain >> about. Sakari? >> >> Alexandre: >> >> If Collabora/Bootlin is there, I'd certainly want to discuss stateless >> codecs, in particular m2m codec helpers and finalize the specification >> in general. >> >> Regards, >> >> Hans >> >
Re: [ANN] Topics for a media summit in Lyon in October
On Wed, Aug 28, 2019 at 7:55 PM Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > > Rather then discussing topics for a meeting under the subject 'Lisbon' > > let's start a new thread referring to the right place :-) > > > > I will try to organize a room, either during the ELCE or (if that doesn't > > work) perhaps on the Thursday afterwards. If that's going to be a problem > > for someone, please let me know. > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > that room, but if a lot of people who want to come, will already have left > on the Thursday, then there is no point in me reserving this room. > > So if you are unable to attend on Thursday, then please let me know asap! > > If Thursday is no problem, then I wanted to have more informal meetings > somewhere in the conference center during the morning, and after lunch > use the room. > > If Thursday is a no-go, then we will just have to find a place inside > the conference center during the ELCE. Thanks for organizing this! I'm okay with Thursday, but would prefer a day during the conference. Best regards, Tomasz > > Regards, > > Hans > > > > > I do need to know how many people I can expect. I have the following > > confirmed attendees (and please reply if you are not listed!): > > > > Alexandre Courbot > > Tomasz Figa > > Jacopo Mondi > > Laurent Pinchart > > Hans Verkuil > > > > I know there were more who mentioned on irc that they would attend, > > but it is easier to keep track if I have it in an email. > > > > Topics posted under the previous thread: > > > > Tomasz: > > > > I would want to discuss various v4l2_buffer improvements, e.g. > > - DMA-buf import with plane offsets, > > - unifying the buffer structs for M and non-M formats, > > - ability to import different FDs with offsets for non-M formats if the > > layout matches driver expectations, etc. > > > > Besides that, I would be interested in the general idea on handling > > complex cameras in the Linux kernel in spite of the remaining V4L2 > > limitations, e.g. > > - 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. > > > > Jacopo: > > > > Apart from discussing libcamera and hope we could kickstart a review of > > its API, I would like to re-start discussing multiplexed stream support, > > but that would require Sakari to be there, something I'm not certain > > about. Sakari? > > > > Alexandre: > > > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > > codecs, in particular m2m codec helpers and finalize the specification > > in general. > > > > Regards, > > > > Hans > > >
Re: [ANN] Topics for a media summit in Lyon in October
Le mercredi 28 août 2019 à 12:55 +0200, Hans Verkuil a écrit : > On 8/16/19 10:06 AM, Hans Verkuil wrote: > > Rather then discussing topics for a meeting under the subject 'Lisbon' > > let's start a new thread referring to the right place :-) > > > > I will try to organize a room, either during the ELCE or (if that doesn't > > work) perhaps on the Thursday afterwards. If that's going to be a problem > > for someone, please let me know. > > I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take > that room, but if a lot of people who want to come, will already have left > on the Thursday, then there is no point in me reserving this room. > > So if you are unable to attend on Thursday, then please let me know asap! > > If Thursday is no problem, then I wanted to have more informal meetings > somewhere in the conference center during the morning, and after lunch > use the room. > > If Thursday is a no-go, then we will just have to find a place inside > the conference center during the ELCE. For me it is not possible on Thursday, since it's day one of GStreamer Conference. The conference ends at 17h and is 6km away from ELCE venue. > > Regards, > > Hans > > > I do need to know how many people I can expect. I have the following > > confirmed attendees (and please reply if you are not listed!): > > > > Alexandre Courbot > > Tomasz Figa > > Jacopo Mondi > > Laurent Pinchart > > Hans Verkuil > > > > I know there were more who mentioned on irc that they would attend, > > but it is easier to keep track if I have it in an email. > > > > Topics posted under the previous thread: > > > > Tomasz: > > > > I would want to discuss various v4l2_buffer improvements, e.g. > > - DMA-buf import with plane offsets, > > - unifying the buffer structs for M and non-M formats, > > - ability to import different FDs with offsets for non-M formats if the > > layout matches driver expectations, etc. > > > > Besides that, I would be interested in the general idea on handling > > complex cameras in the Linux kernel in spite of the remaining V4L2 > > limitations, e.g. > > - 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. > > > > Jacopo: > > > > Apart from discussing libcamera and hope we could kickstart a review of > > its API, I would like to re-start discussing multiplexed stream support, > > but that would require Sakari to be there, something I'm not certain > > about. Sakari? > > > > Alexandre: > > > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > > codecs, in particular m2m codec helpers and finalize the specification > > in general. > > > > Regards, > > > > Hans > >
Re: [ANN] Topics for a media summit in Lyon in October
On 8/16/19 10:06 AM, Hans Verkuil wrote: > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. I can only get a room for Thursday afternoon (2pm-6pm). I'm inclined to take that room, but if a lot of people who want to come, will already have left on the Thursday, then there is no point in me reserving this room. So if you are unable to attend on Thursday, then please let me know asap! If Thursday is no problem, then I wanted to have more informal meetings somewhere in the conference center during the morning, and after lunch use the room. If Thursday is a no-go, then we will just have to find a place inside the conference center during the ELCE. Regards, Hans > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): > > Alexandre Courbot > Tomasz Figa > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > I know there were more who mentioned on irc that they would attend, > but it is easier to keep track if I have it in an email. > > Topics posted under the previous thread: > > Tomasz: > > I would want to discuss various v4l2_buffer improvements, e.g. > - DMA-buf import with plane offsets, > - unifying the buffer structs for M and non-M formats, > - ability to import different FDs with offsets for non-M formats if the > layout matches driver expectations, etc. > > Besides that, I would be interested in the general idea on handling > complex cameras in the Linux kernel in spite of the remaining V4L2 > limitations, e.g. > - 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. > > Jacopo: > > Apart from discussing libcamera and hope we could kickstart a review of > its API, I would like to re-start discussing multiplexed stream support, > but that would require Sakari to be there, something I'm not certain > about. Sakari? > > Alexandre: > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > codecs, in particular m2m codec helpers and finalize the specification > in general. > > Regards, > > Hans >
Re: [ANN] Topics for a media summit in Lyon in October
Hi Eugen, On Mon, Aug 19, 2019 at 03:24:26PM +, eugen.hris...@microchip.com wrote: > On 19.08.2019 18:04, Laurent Pinchart wrote: > > On Mon, Aug 19, 2019 at 11:43:56AM -0300, Ezequiel Garcia wrote: > >> On Mon, 2019-08-19 at 09:44 +0200, Hans Verkuil wrote: > >>> On 8/16/19 10:06 AM, Hans Verkuil wrote: > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): > > Alexandre Courbot > Tomasz Figa > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > I know there were more who mentioned on irc that they would attend, > but it is easier to keep track if I have it in an email. > > Topics posted under the previous thread: > > Tomasz: > > I would want to discuss various v4l2_buffer improvements, e.g. > - DMA-buf import with plane offsets, > - unifying the buffer structs for M and non-M formats, > - ability to import different FDs with offsets for non-M formats if the > layout matches driver expectations, etc. > > Besides that, I would be interested in the general idea on handling > complex cameras in the Linux kernel in spite of the remaining V4L2 > limitations, e.g. > - 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. > > Jacopo: > > Apart from discussing libcamera and hope we could kickstart a review of > its API, I would like to re-start discussing multiplexed stream support, > but that would require Sakari to be there, something I'm not certain > about. Sakari? > > Alexandre: > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > codecs, in particular m2m codec helpers and finalize the specification > in general. > >>> > >>> Hans: > >>> > >>> Finalize the stateful encoder API. There are still two TODOs there, see: > >>> https://patchwork.kernel.org/cover/10972783/ > >> > >> A few Collaborans, including me will be attending. > >> > >> On my side, I'd like to discuss the staging stateless codec drivers > >> and the conditions and requirements for them to move out of staging. > > > > If time (and interest) permits, we could also discuss the next steps for > > libcamera and their implications on the kernel side. > > > > Is there any news regarding the date of the meeting ? Thursday after the > > conference would be best for me, but if it's during the conference, I > > could still attend part of the discussions (depending on the conference > > schedule). > > > > Hello, > > I will be in Lyon and would love to attend. I am pretty much new to > media subsystem and eager to learn more about it. > My interest is related to platform drivers and support for small ISPs > inside hardware controllers. I would be very interested in discussing that topic with you, at any time that would fit your schedule. > P.S. Not sure if will be still there on Thursday or only Mon-Wed -- Regards, Laurent Pinchart
Re: [ANN] Topics for a media summit in Lyon in October
On 19.08.2019 18:04, Laurent Pinchart wrote: > Hello, > > On Mon, Aug 19, 2019 at 11:43:56AM -0300, Ezequiel Garcia wrote: >> On Mon, 2019-08-19 at 09:44 +0200, Hans Verkuil wrote: >>> On 8/16/19 10:06 AM, Hans Verkuil wrote: Rather then discussing topics for a meeting under the subject 'Lisbon' let's start a new thread referring to the right place :-) I will try to organize a room, either during the ELCE or (if that doesn't work) perhaps on the Thursday afterwards. If that's going to be a problem for someone, please let me know. I do need to know how many people I can expect. I have the following confirmed attendees (and please reply if you are not listed!): Alexandre Courbot Tomasz Figa Jacopo Mondi Laurent Pinchart Hans Verkuil I know there were more who mentioned on irc that they would attend, but it is easier to keep track if I have it in an email. Topics posted under the previous thread: Tomasz: I would want to discuss various v4l2_buffer improvements, e.g. - DMA-buf import with plane offsets, - unifying the buffer structs for M and non-M formats, - ability to import different FDs with offsets for non-M formats if the layout matches driver expectations, etc. Besides that, I would be interested in the general idea on handling complex cameras in the Linux kernel in spite of the remaining V4L2 limitations, e.g. - 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. Jacopo: Apart from discussing libcamera and hope we could kickstart a review of its API, I would like to re-start discussing multiplexed stream support, but that would require Sakari to be there, something I'm not certain about. Sakari? Alexandre: If Collabora/Bootlin is there, I'd certainly want to discuss stateless codecs, in particular m2m codec helpers and finalize the specification in general. >>> >>> Hans: >>> >>> Finalize the stateful encoder API. There are still two TODOs there, see: >>> https://patchwork.kernel.org/cover/10972783/ >>> >> >> A few Collaborans, including me will be attending. >> >> On my side, I'd like to discuss the staging stateless codec drivers >> and the conditions and requirements for them to move out of staging. > > If time (and interest) permits, we could also discuss the next steps for > libcamera and their implications on the kernel side. > > Is there any news regarding the date of the meeting ? Thursday after the > conference would be best for me, but if it's during the conference, I > could still attend part of the discussions (depending on the conference > schedule). > Hello, I will be in Lyon and would love to attend. I am pretty much new to media subsystem and eager to learn more about it. My interest is related to platform drivers and support for small ISPs inside hardware controllers. P.S. Not sure if will be still there on Thursday or only Mon-Wed Thanks, Eugen
Re: [ANN] Topics for a media summit in Lyon in October
Hello, On Mon, Aug 19, 2019 at 11:43:56AM -0300, Ezequiel Garcia wrote: > On Mon, 2019-08-19 at 09:44 +0200, Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > > > Rather then discussing topics for a meeting under the subject 'Lisbon' > > > let's start a new thread referring to the right place :-) > > > > > > I will try to organize a room, either during the ELCE or (if that doesn't > > > work) perhaps on the Thursday afterwards. If that's going to be a problem > > > for someone, please let me know. > > > > > > I do need to know how many people I can expect. I have the following > > > confirmed attendees (and please reply if you are not listed!): > > > > > > Alexandre Courbot > > > Tomasz Figa > > > Jacopo Mondi > > > Laurent Pinchart > > > Hans Verkuil > > > > > > I know there were more who mentioned on irc that they would attend, > > > but it is easier to keep track if I have it in an email. > > > > > > Topics posted under the previous thread: > > > > > > Tomasz: > > > > > > I would want to discuss various v4l2_buffer improvements, e.g. > > > - DMA-buf import with plane offsets, > > > - unifying the buffer structs for M and non-M formats, > > > - ability to import different FDs with offsets for non-M formats if the > > > layout matches driver expectations, etc. > > > > > > Besides that, I would be interested in the general idea on handling > > > complex cameras in the Linux kernel in spite of the remaining V4L2 > > > limitations, e.g. > > > - 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. > > > > > > Jacopo: > > > > > > Apart from discussing libcamera and hope we could kickstart a review of > > > its API, I would like to re-start discussing multiplexed stream support, > > > but that would require Sakari to be there, something I'm not certain > > > about. Sakari? > > > > > > Alexandre: > > > > > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > > > codecs, in particular m2m codec helpers and finalize the specification > > > in general. > > > > Hans: > > > > Finalize the stateful encoder API. There are still two TODOs there, see: > > https://patchwork.kernel.org/cover/10972783/ > > > > A few Collaborans, including me will be attending. > > On my side, I'd like to discuss the staging stateless codec drivers > and the conditions and requirements for them to move out of staging. If time (and interest) permits, we could also discuss the next steps for libcamera and their implications on the kernel side. Is there any news regarding the date of the meeting ? Thursday after the conference would be best for me, but if it's during the conference, I could still attend part of the discussions (depending on the conference schedule). -- Regards, Laurent Pinchart
Re: [ANN] Topics for a media summit in Lyon in October
On Mon, 2019-08-19 at 09:44 +0200, Hans Verkuil wrote: > On 8/16/19 10:06 AM, Hans Verkuil wrote: > > Rather then discussing topics for a meeting under the subject 'Lisbon' > > let's start a new thread referring to the right place :-) > > > > I will try to organize a room, either during the ELCE or (if that doesn't > > work) perhaps on the Thursday afterwards. If that's going to be a problem > > for someone, please let me know. > > > > I do need to know how many people I can expect. I have the following > > confirmed attendees (and please reply if you are not listed!): > > > > Alexandre Courbot > > Tomasz Figa > > Jacopo Mondi > > Laurent Pinchart > > Hans Verkuil > > > > I know there were more who mentioned on irc that they would attend, > > but it is easier to keep track if I have it in an email. > > > > Topics posted under the previous thread: > > > > Tomasz: > > > > I would want to discuss various v4l2_buffer improvements, e.g. > > - DMA-buf import with plane offsets, > > - unifying the buffer structs for M and non-M formats, > > - ability to import different FDs with offsets for non-M formats if the > > layout matches driver expectations, etc. > > > > Besides that, I would be interested in the general idea on handling > > complex cameras in the Linux kernel in spite of the remaining V4L2 > > limitations, e.g. > > - 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. > > > > Jacopo: > > > > Apart from discussing libcamera and hope we could kickstart a review of > > its API, I would like to re-start discussing multiplexed stream support, > > but that would require Sakari to be there, something I'm not certain > > about. Sakari? > > > > Alexandre: > > > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > > codecs, in particular m2m codec helpers and finalize the specification > > in general. > > Hans: > > Finalize the stateful encoder API. There are still two TODOs there, see: > https://patchwork.kernel.org/cover/10972783/ > A few Collaborans, including me will be attending. On my side, I'd like to discuss the staging stateless codec drivers and the conditions and requirements for them to move out of staging. Thanks, Ezequiel
Re: [ANN] Topics for a media summit in Lyon in October
On 8/16/19 10:06 AM, Hans Verkuil wrote: > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): > > Alexandre Courbot > Tomasz Figa > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > I know there were more who mentioned on irc that they would attend, > but it is easier to keep track if I have it in an email. > > Topics posted under the previous thread: > > Tomasz: > > I would want to discuss various v4l2_buffer improvements, e.g. > - DMA-buf import with plane offsets, > - unifying the buffer structs for M and non-M formats, > - ability to import different FDs with offsets for non-M formats if the > layout matches driver expectations, etc. > > Besides that, I would be interested in the general idea on handling > complex cameras in the Linux kernel in spite of the remaining V4L2 > limitations, e.g. > - 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. > > Jacopo: > > Apart from discussing libcamera and hope we could kickstart a review of > its API, I would like to re-start discussing multiplexed stream support, > but that would require Sakari to be there, something I'm not certain > about. Sakari? > > Alexandre: > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > codecs, in particular m2m codec helpers and finalize the specification > in general. Hans: Finalize the stateful encoder API. There are still two TODOs there, see: https://patchwork.kernel.org/cover/10972783/ Regards, Hans
Re: [ANN] Topics for a media summit in Lyon in October
Em Fri, 16 Aug 2019 10:06:30 +0200 Hans Verkuil escreveu: > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): I'm not planning to go to ELCE this year. Regards, Mauro > > Alexandre Courbot > Tomasz Figa > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > I know there were more who mentioned on irc that they would attend, > but it is easier to keep track if I have it in an email. > > Topics posted under the previous thread: > > Tomasz: > > I would want to discuss various v4l2_buffer improvements, e.g. > - DMA-buf import with plane offsets, > - unifying the buffer structs for M and non-M formats, > - ability to import different FDs with offsets for non-M formats if the > layout matches driver expectations, etc. > > Besides that, I would be interested in the general idea on handling > complex cameras in the Linux kernel in spite of the remaining V4L2 > limitations, e.g. > - 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. > > Jacopo: > > Apart from discussing libcamera and hope we could kickstart a review of > its API, I would like to re-start discussing multiplexed stream support, > but that would require Sakari to be there, something I'm not certain > about. Sakari? > > Alexandre: > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > codecs, in particular m2m codec helpers and finalize the specification > in general. > > Regards, > > Hans Thanks, Mauro
Re: [ANN] Topics for a media summit in Lyon in October
On 8/16/19 10:22 AM, Tomasz Figa wrote: > On Fri, Aug 16, 2019 at 5:10 PM Hans Verkuil wrote: >> >> On 8/16/19 10:06 AM, Hans Verkuil wrote: >>> Rather then discussing topics for a meeting under the subject 'Lisbon' >>> let's start a new thread referring to the right place :-) >>> >>> I will try to organize a room, either during the ELCE or (if that doesn't >>> work) perhaps on the Thursday afterwards. If that's going to be a problem >>> for someone, please let me know. >>> >>> I do need to know how many people I can expect. I have the following >>> confirmed attendees (and please reply if you are not listed!): >>> >>> Alexandre Courbot >>> Tomasz Figa >>> Jacopo Mondi >>> Laurent Pinchart >>> Hans Verkuil >>> >>> I know there were more who mentioned on irc that they would attend, >>> but it is easier to keep track if I have it in an email. >>> >>> Topics posted under the previous thread: >>> >>> Tomasz: >>> >>> I would want to discuss various v4l2_buffer improvements, e.g. >>> - DMA-buf import with plane offsets, >>> - unifying the buffer structs for M and non-M formats, >>> - ability to import different FDs with offsets for non-M formats if the >>> layout matches driver expectations, etc. >>> >>> Besides that, I would be interested in the general idea on handling >>> complex cameras in the Linux kernel in spite of the remaining V4L2 >>> limitations, e.g. >>> - 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. >> >> Tomasz, I am not sure if this is suitable for a media summit: my feeling >> is that this is much more suitable for a three day brainstorming session. >> >> My 'roadmap' was to get the codec support sorted first, then start working >> on this. > > I mostly dumped the topics I had in my head, leaving out the codecs as > the obvious thing that people are already planning to talk about. > > That said, there's been more interest in having proper Linux drivers > for camera capture IFs and ISPs and also a lot of feedback about the > issues I listed above. I'm afraid that if we don't start looking into > them early enough, we're going to end up in the same state as with > codecs where we're few years too late or even in the worst case just > the interest fading away. :( I agree that this shouldn't wait too long. And my view is that we should start working on this later this year. I suspect that I should be able to spend time on this in 1-2 months since it looks like the codec work should be mostly complete by then. Regards, Hans > > I guess we could try to organize a separate session on another day for > this, though. +Sakari Ailus who might be also interested in this. > > Best regards, > Tomasz > >> >> Regards, >> >> Hans >> >>> >>> Jacopo: >>> >>> Apart from discussing libcamera and hope we could kickstart a review of >>> its API, I would like to re-start discussing multiplexed stream support, >>> but that would require Sakari to be there, something I'm not certain >>> about. Sakari? >>> >>> Alexandre: >>> >>> If Collabora/Bootlin is there, I'd certainly want to discuss stateless >>> codecs, in particular m2m codec helpers and finalize the specification >>> in general. >>> >>> Regards, >>> >>> Hans >>> >>
Re: [ANN] Topics for a media summit in Lyon in October
On Fri, Aug 16, 2019 at 5:10 PM Hans Verkuil wrote: > > On 8/16/19 10:06 AM, Hans Verkuil wrote: > > Rather then discussing topics for a meeting under the subject 'Lisbon' > > let's start a new thread referring to the right place :-) > > > > I will try to organize a room, either during the ELCE or (if that doesn't > > work) perhaps on the Thursday afterwards. If that's going to be a problem > > for someone, please let me know. > > > > I do need to know how many people I can expect. I have the following > > confirmed attendees (and please reply if you are not listed!): > > > > Alexandre Courbot > > Tomasz Figa > > Jacopo Mondi > > Laurent Pinchart > > Hans Verkuil > > > > I know there were more who mentioned on irc that they would attend, > > but it is easier to keep track if I have it in an email. > > > > Topics posted under the previous thread: > > > > Tomasz: > > > > I would want to discuss various v4l2_buffer improvements, e.g. > > - DMA-buf import with plane offsets, > > - unifying the buffer structs for M and non-M formats, > > - ability to import different FDs with offsets for non-M formats if the > > layout matches driver expectations, etc. > > > > Besides that, I would be interested in the general idea on handling > > complex cameras in the Linux kernel in spite of the remaining V4L2 > > limitations, e.g. > > - 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. > > Tomasz, I am not sure if this is suitable for a media summit: my feeling > is that this is much more suitable for a three day brainstorming session. > > My 'roadmap' was to get the codec support sorted first, then start working > on this. I mostly dumped the topics I had in my head, leaving out the codecs as the obvious thing that people are already planning to talk about. That said, there's been more interest in having proper Linux drivers for camera capture IFs and ISPs and also a lot of feedback about the issues I listed above. I'm afraid that if we don't start looking into them early enough, we're going to end up in the same state as with codecs where we're few years too late or even in the worst case just the interest fading away. :( I guess we could try to organize a separate session on another day for this, though. +Sakari Ailus who might be also interested in this. Best regards, Tomasz > > Regards, > > Hans > > > > > Jacopo: > > > > Apart from discussing libcamera and hope we could kickstart a review of > > its API, I would like to re-start discussing multiplexed stream support, > > but that would require Sakari to be there, something I'm not certain > > about. Sakari? > > > > Alexandre: > > > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > > codecs, in particular m2m codec helpers and finalize the specification > > in general. > > > > Regards, > > > > Hans > > >
Re: [ANN] Topics for a media summit in Lyon in October
On 8/16/19 10:06 AM, Hans Verkuil wrote: > Rather then discussing topics for a meeting under the subject 'Lisbon' > let's start a new thread referring to the right place :-) > > I will try to organize a room, either during the ELCE or (if that doesn't > work) perhaps on the Thursday afterwards. If that's going to be a problem > for someone, please let me know. > > I do need to know how many people I can expect. I have the following > confirmed attendees (and please reply if you are not listed!): > > Alexandre Courbot > Tomasz Figa > Jacopo Mondi > Laurent Pinchart > Hans Verkuil > > I know there were more who mentioned on irc that they would attend, > but it is easier to keep track if I have it in an email. > > Topics posted under the previous thread: > > Tomasz: > > I would want to discuss various v4l2_buffer improvements, e.g. > - DMA-buf import with plane offsets, > - unifying the buffer structs for M and non-M formats, > - ability to import different FDs with offsets for non-M formats if the > layout matches driver expectations, etc. > > Besides that, I would be interested in the general idea on handling > complex cameras in the Linux kernel in spite of the remaining V4L2 > limitations, e.g. > - 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. Tomasz, I am not sure if this is suitable for a media summit: my feeling is that this is much more suitable for a three day brainstorming session. My 'roadmap' was to get the codec support sorted first, then start working on this. Regards, Hans > > Jacopo: > > Apart from discussing libcamera and hope we could kickstart a review of > its API, I would like to re-start discussing multiplexed stream support, > but that would require Sakari to be there, something I'm not certain > about. Sakari? > > Alexandre: > > If Collabora/Bootlin is there, I'd certainly want to discuss stateless > codecs, in particular m2m codec helpers and finalize the specification > in general. > > Regards, > > Hans >
[ANN] Topics for a media summit in Lyon in October
Rather then discussing topics for a meeting under the subject 'Lisbon' let's start a new thread referring to the right place :-) I will try to organize a room, either during the ELCE or (if that doesn't work) perhaps on the Thursday afterwards. If that's going to be a problem for someone, please let me know. I do need to know how many people I can expect. I have the following confirmed attendees (and please reply if you are not listed!): Alexandre Courbot Tomasz Figa Jacopo Mondi Laurent Pinchart Hans Verkuil I know there were more who mentioned on irc that they would attend, but it is easier to keep track if I have it in an email. Topics posted under the previous thread: Tomasz: I would want to discuss various v4l2_buffer improvements, e.g. - DMA-buf import with plane offsets, - unifying the buffer structs for M and non-M formats, - ability to import different FDs with offsets for non-M formats if the layout matches driver expectations, etc. Besides that, I would be interested in the general idea on handling complex cameras in the Linux kernel in spite of the remaining V4L2 limitations, e.g. - 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. Jacopo: Apart from discussing libcamera and hope we could kickstart a review of its API, I would like to re-start discussing multiplexed stream support, but that would require Sakari to be there, something I'm not certain about. Sakari? Alexandre: If Collabora/Bootlin is there, I'd certainly want to discuss stateless codecs, in particular m2m codec helpers and finalize the specification in general. Regards, Hans
