From: Mark Thompson <sw@jkqxz.net>
To: ffmpeg-devel@ffmpeg.org
Subject: Re: [FFmpeg-devel] [PATCH] avcodec/cbs_jpeg: Fix size of huffman symbol table array
Date: Sat, 30 Apr 2022 18:16:55 +0100
Message-ID: <ebaf462b-b789-8e19-d4f4-eef9e8996878@jkqxz.net> (raw)
In-Reply-To: <AM7PR03MB66606E1CA7B99EBF74E10A778F2D9@AM7PR03MB6660.eurprd03.prod.outlook.com>
On 08/02/2022 09:41, Andreas Rheinhardt wrote:
> L[i] can be in the range of 0-255, see table B.5 of ITU T.81.
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
> libavcodec/cbs_jpeg.h | 2 +-
> libavcodec/cbs_jpeg_syntax_template.c | 4 ++--
> 2 files changed, 3 insertions(+), 3 deletions(-)
Do you have a valid file showing this? Not all values are allowed.
I guess I must have written it, but I have no idea where 224 came from. As far as I know the worst case is in AC tables: 10 category values * 16 run lengths + 2 special cases = 162 (which could indeed all be dumped in the same code length if you want to be pathological).
- Mark
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next prev parent reply other threads:[~2022-04-30 17:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-08 9:41 Andreas Rheinhardt
2022-02-11 9:28 ` Andreas Rheinhardt
2022-04-30 17:16 ` Mark Thompson [this message]
2022-04-30 18:38 ` Andreas Rheinhardt
2022-04-30 19:18 ` Mark Thompson
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