linux-kernel - Re: [PATCH 4/9] media: v4l2: Add JPEG pixel format to v4l2 format info

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Message-ID: <2135691.irdbgypaU6@kista>
Date:   Sat, 25 Mar 2023 08:08:17 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Adam Pigg <adam@...gz.co.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 4/9] media: v4l2: Add JPEG pixel format to v4l2 format info

Dne petek, 24. marec 2023 ob 16:12:23 CET je Paul Kocialkowski napisal(a):
> Represent the JPEG pixel format in the v4l2 format info table.
> 
> Note that the bpp is set to 1 which is not a proper way to estimate
> the needed buffer size for a given JPEG image. However the compression
> ratios of JPEG typically allow fitting the image in a smaller size,
> even though extra metadata could increase the total size by an
> arbitrary amount. Thus it is not a perfectly safe way to calculate the
> size of a JPEG buffer for given dimensions but it still provides a
> reasonable approach.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

Acked-by: Jernej Skrabec <jernej.skrabec@...il.com>

Best regards,
Jernej