[FFmpeg-devel] [PATCH v2] avcodec/hevc/hevcdec: Do not allow slices to depend on failed slices

[Michael Niedermayer]

On Wed, Jul 17, 2024 at 08:42:41AM +0200, Anton Khirnov wrote:
> Quoting Michael Niedermayer (2024-07-15 16:48:25)
[...]
> > @@ -3155,8 +3156,11 @@ static int decode_slice(HEVCContext *s, const H2645NAL *nal, GetBitContext *gb)
> >      int ret;
> >  
> >      ret = hls_slice_header(&s->sh, s, gb);
> > -    if (ret < 0)
> > +    if (ret < 0) {
> > +        //The code is not capable to rewind from an error, the state now is inconsistant so we cannot use it on depandant slices
>                                                                                         ^                                ^
>                                                                                         e                                e
> Also I'd drop everything before the comma, why mention rewinding that is
> not implemented and may not be a good idea anyway.

It seems we disagree on some things.
A failing function should not corrupt the state. We also dont do that
in other cases like SPS/PPS.
This is also unexpected, so it should be documented.

thx

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Modern terrorism, a quick summary: Need oil, start war with country that
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people, be surprised about them taking revenge and drop even more bombs
and strip your own citizens of their rights and freedoms. to be continued
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