linux-kernel - Re: [PATCH v5 01/15] media: uapi: HEVC: Add v4l2_ctrl_hevc_ext_sps_[ls]t

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Message-ID: <0482b76919217cf007d0abe1c683e862903a1a40.camel@collabora.com>
Date: Wed, 17 Dec 2025 08:34:33 -0500
From: Nicolas Dufresne <nicolas.dufresne@...labora.com>
To: Detlev Casanova <detlev.casanova@...labora.com>, Hans Verkuil
	 <hverkuil+cisco@...nel.org>, linux-kernel@...r.kernel.org
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Ezequiel Garcia	
 <ezequiel@...guardiasur.com.ar>, Heiko Stuebner <heiko@...ech.de>, Ricardo
 Ribalda <ribalda@...omium.org>, Hans Verkuil <hverkuil@...nel.org>, Hans de
 Goede <hansg@...nel.org>,  Yunke Cao <yunkec@...gle.com>, Jonathan Corbet
 <corbet@....net>, Laurent Pinchart	 <laurent.pinchart@...asonboard.com>,
 Sakari Ailus <sakari.ailus@...ux.intel.com>,  James Cowgill
 <james.cowgill@...ize.com>, linux-media@...r.kernel.org,
 linux-rockchip@...ts.infradead.org, 	linux-arm-kernel@...ts.infradead.org,
 kernel@...labora.com
Subject: Re: [PATCH v5 01/15] media: uapi: HEVC: Add
 v4l2_ctrl_hevc_ext_sps_[ls]t_rps controls

Hi,

Le mardi 16 décembre 2025 à 17:18 -0500, Detlev Casanova a écrit :
> > Before going that route, how big are these two arrays ? Short term can be 64
> > ref, long term 32, how big in bytes that is ? Was is worth goign with
> > dynamic
> > array ? Its not like slices, where we can have 600 or more.
> 
> The short term one can still be quite big, it's about 80 bytes per 
> element, so 5120 bytes for the 64.
> 
> I don't know how often we go that high, I've seen around 10 short term 
> ref sets in test videos.

We've never defined a threshold, so its hard to just define which direction to
go. I generally think using dynamic array was logical thing to do though.

Nicolas

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