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From: Tomasz Figa <tfiga@chromium.org>
To: Jacopo Mondi <jacopo@jmondi.org>
Cc: Alexandre Courbot <acourbot@chromium.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Hans Verkuil <hverkuil@xs4all.nl>,
	Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
	Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: [ANN] Media summit in Lisbon at September
Date: Fri, 16 Aug 2019 16:51:25 +0900
Message-ID: <CAAFQd5DFkL60FJ4s0RZqQZNcz-ZwNr0ULi1w3ywF4hpzHyC-xA@mail.gmail.com> (raw)
In-Reply-To: <20190816073109.ydqzndocuetqdajh@uno.localdomain>

On Fri, Aug 16, 2019 at 4:29 PM Jacopo Mondi <jacopo@jmondi.org> wrote:
>
> Hi Alexandre,
>
> On Fri, Aug 16, 2019 at 02:52:13PM +0900, Alexandre Courbot wrote:
> > On Wed, Aug 14, 2019 at 6:40 PM Laurent Pinchart
> > <laurent.pinchart@ideasonboard.com> wrote:
> > >
> > > On Wed, Aug 14, 2019 at 05:35:48PM +0900, Alexandre Courbot wrote:
> > > > That could be nice. Of course something more informal is also fine.
> > > > Anyone else planning to attend? I suspect Laurent and people living in
> > > > France might be there?
> > >
> > > I will, and so should the whole libcamera team.
> >
> > It seems to be confirmed that Tomasz and I will be attending. Maybe we
> > can come with a list of topics to discuss for all people present?
> >
>
> 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?

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 offets 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.

Best regards,
Tomasz

>
> Thanks
>    j
>
> > If Collabora/Bootlin is there, I'd certainly want to discuss stateless
> > codecs, in particular m2m codec helpers and finalize the specification
> > in general.
> >
>
>
> > >
> > > > On Mon, Aug 12, 2019 at 4:28 PM Hans Verkuil wrote:
> > > > > On 8/12/19 6:00 AM, Alexandre Courbot wrote:
> > > > > > On Thu, Aug 8, 2019 at 9:55 PM Mauro Carvalho Chehab wrote:
> > > > > >> Em Thu, 1 Aug 2019 09:34:00 -0300 Mauro Carvalho Chehab escreveu:
> > > > > >>> Em Sun, 30 Jun 2019 13:44:04 -0300 Mauro Carvalho Chehab escreveu:
> > > > > >>>
> > > > > >>>> Hi all,
> > > > > >>>>
> > > > > >>>> We are organizing a media mini-summit in Lisbon to happen in September,
> > > > > >>>> at the same week as the Linux Plumber Conference and the Kernel Summit.
> > > > > >>>>
> > > > > >>>> We're still discussing the details about that.
> > > > > >>>
> > > > > >>> Gently reminder.
> > > > > >>>
> > > > > >>> Right now, we have just one extra theme proposal from Sean:
> > > > > >>>
> > > > > >>>       - possible dvb improvements.
> > > > > >>>
> > > > > >>> If we don't have more proposals, we may end skipping the Media
> > > > > >>> Summit this year.
> > > > > >>
> > > > > >> It sounds that we won't have material to have a media summit this year.
> > > > > >> So, let's cancel the media summit this year.
> > > > > >
> > > > > > Loosely related, but are there people planning to go to ELCE on
> > > > > > 10/28-30? Tomasz and I may attend if there is a chance to discuss
> > > > > > libcamera/V4L2 codecs.
> > > > >
> > > > > I'll be there and if there is enough interest in setting up a meeting
> > > > > to discuss this, then I can ask the LF to set a room aside for us for,
> > > > > say, half a day or so.
> > >
> > > --
> > > Regards,
> > >
> > > Laurent Pinchart

  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-30 16:44 Mauro Carvalho Chehab
2019-07-01  9:19 ` Sean Young
2019-07-04 13:16 ` Ezequiel Garcia
2019-08-01 12:34 ` Mauro Carvalho Chehab
2019-08-02  1:24   ` Sean Young
2019-08-08 12:55   ` Mauro Carvalho Chehab
2019-08-12  4:00     ` Alexandre Courbot
2019-08-12  7:27       ` Hans Verkuil
2019-08-14  8:35         ` Alexandre Courbot
2019-08-14  9:40           ` Laurent Pinchart
2019-08-16  5:52             ` Alexandre Courbot
2019-08-16  7:31               ` Jacopo Mondi
2019-08-16  7:51                 ` Tomasz Figa [this message]
2019-08-27 17:29               ` Nicolas Dufresne

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