From: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
To: Boris Brezillon <boris.brezillon@collabora.com>,
Thierry Reding <thierry.reding@gmail.com>
Cc: Nicolas Dufresne <nicolas@ndufresne.ca>,
Linux Media Mailing List <linux-media@vger.kernel.org>,
Hans Verkuil <hverkuil-cisco@xs4all.nl>,
Tomasz Figa <tfiga@chromium.org>,
Alexandre Courbot <acourbot@chromium.org>,
Maxime Ripard <maxime.ripard@bootlin.com>,
Jernej Skrabec <jernej.skrabec@siol.net>,
Ezequiel Garcia <ezequiel@collabora.com>,
Jonas Karlman <jonas@kwiboo.se>
Subject: Re: Proposed updates and guidelines for MPEG-2, H.264 and H.265 stateless support
Date: Tue, 04 Jun 2019 11:09:07 +0200 [thread overview]
Message-ID: <c76e8694ea4f378e82653d1f8bc981f434706223.camel@bootlin.com> (raw)
In-Reply-To: <20190604110527.48d16907@collabora.com>
Hi,
On Tue, 2019-06-04 at 11:05 +0200, Boris Brezillon wrote:
> On Tue, 4 Jun 2019 10:55:03 +0200
> Thierry Reding <thierry.reding@gmail.com> wrote:
>
> > On Mon, Jun 03, 2019 at 02:52:44PM -0400, Nicolas Dufresne wrote:
> > [...]
> > > There is one thing that come up though, if we enable per-frame decoding
> > > on top of per-slice decoder (like Cedrus), won't we force userspace to
> > > always compute l0/l1 even though the HW might be handling that ? Shall
> > > we instead pass the modification list and implement the non-parsing
> > > bits of applying the modifications in the kernel ?
> >
> > Applying the modifications is a standard procedure, right? If it's
> > completely driver-agnostic, it sounds to me like the right place to
> > perform the operation is in userspace.
>
> Well, the counter argument to that is "drivers know better what's
> needed by the HW", and if we want to avoid doing useless work without
> having complex caps checking done in userspace, doing this task
> kenel-side makes sense.
I believe we should also try and alleviate the pain on the user-space
side by having these decoder-specific details handled by the kernel.
It also brings us closer to bitstream format (where the modifications
are coded) and leaves DPB management to the decoder/driver, which IMO
makes a lot of sense.
Cheers,
Paul
--
Paul Kocialkowski, Bootlin
Embedded Linux and kernel engineering
https://bootlin.com
prev parent reply other threads:[~2019-06-04 9:09 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-15 10:09 Proposed updates and guidelines for MPEG-2, H.264 and H.265 stateless support Paul Kocialkowski
2019-05-15 14:42 ` Nicolas Dufresne
2019-05-15 17:42 ` Paul Kocialkowski
2019-05-15 18:54 ` Nicolas Dufresne
2019-05-15 20:59 ` Paul Kocialkowski
2019-05-16 18:24 ` Nicolas Dufresne
2019-05-16 18:45 ` Paul Kocialkowski
2019-05-17 20:43 ` Nicolas Dufresne
2019-05-18 9:50 ` Paul Kocialkowski
2019-05-18 10:04 ` Jernej Škrabec
2019-05-18 10:29 ` Paul Kocialkowski
2019-05-18 14:09 ` Nicolas Dufresne
2019-05-22 6:48 ` Tomasz Figa
2019-05-22 8:26 ` Paul Kocialkowski
2019-05-22 10:42 ` Thierry Reding
2019-05-22 10:55 ` Hans Verkuil
2019-05-22 11:55 ` Thierry Reding
2019-06-07 6:11 ` Tomasz Figa
2019-06-07 6:45 ` Hans Verkuil
2019-06-07 8:23 ` Hans Verkuil
2019-05-21 10:27 ` Tomasz Figa
2019-05-21 11:44 ` Paul Kocialkowski
2019-05-21 15:09 ` Thierry Reding
2019-05-21 16:07 ` Nicolas Dufresne
2019-05-22 8:08 ` Thierry Reding
2019-05-22 6:01 ` Tomasz Figa
2019-05-22 18:15 ` Nicolas Dufresne
2019-05-21 15:43 ` Thierry Reding
2019-05-21 16:23 ` Nicolas Dufresne
2019-05-22 6:39 ` Tomasz Figa
2019-05-22 7:29 ` Boris Brezillon
2019-05-22 8:20 ` Boris Brezillon
2019-05-22 18:18 ` Nicolas Dufresne
2019-05-22 8:32 ` Thierry Reding
2019-05-22 9:29 ` Paul Kocialkowski
2019-05-22 11:39 ` Thierry Reding
2019-05-22 18:31 ` Nicolas Dufresne
2019-05-22 18:26 ` Nicolas Dufresne
2019-05-22 10:08 ` Thierry Reding
2019-05-22 18:37 ` Nicolas Dufresne
2019-05-23 21:04 ` Jonas Karlman
2019-06-03 11:24 ` Thierry Reding
2019-06-03 18:52 ` Nicolas Dufresne
2019-06-03 19:41 ` Boris Brezillon
2019-06-04 8:31 ` Thierry Reding
2019-06-04 8:49 ` Boris Brezillon
2019-06-04 9:06 ` Thierry Reding
2019-06-04 9:15 ` Jonas Karlman
2019-06-04 9:28 ` Paul Kocialkowski
2019-06-04 9:38 ` Boris Brezillon
2019-06-04 10:49 ` Jonas Karlman
2019-06-04 8:50 ` Thierry Reding
2019-06-04 8:55 ` Thierry Reding
2019-06-04 9:05 ` Boris Brezillon
2019-06-04 9:09 ` Paul Kocialkowski [this message]
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