[FFmpeg-devel] [PATCH 16/17] swscale/format: add new format decode/encode logic

[Niklas Haas]

On Fri, 02 May 2025 16:10:57 +0200 Michael Niedermayer <michael at niedermayer.cc> wrote:
> On Sat, Apr 26, 2025 at 07:41:20PM +0200, Niklas Haas wrote:
> > From: Niklas Haas <git at haasn.dev>
> >
> > This patch adds format handling code for the new operations. This entails
> > fully decoding a format to standardized RGB, and the inverse.
> >
> > Handling it this way means we can always guarantee that a conversion path
> > exists from A to B without having to explicitly cover logic for each path;
> > and choosing RGB instead of YUV as the intermediate (as was done in swscale
> > v1) is more flexible with regards to enabling further operations such as
> > primaries conversions, linear scaling, etc.
> >
> > In the case of YUV->YUV transform, the redundant matrix multiplication will
> > be canceled out anyways.
> > ---
> >  libswscale/format.c | 925 ++++++++++++++++++++++++++++++++++++++++++++
> >  libswscale/format.h |  23 ++
> >  2 files changed, 948 insertions(+)
>
> this or rather the equivalent from your repo breaks here:
>
> In file included from libswscale/ops.h:24,
>                  from libswscale/ops_internal.h:26,
>                  from libswscale/format.c:28:
> libswscale/format.c: In function ‘trc_is_hdr’:
> libswscale/format.c:1249:9: error: a label can only be part of a statement and a declaration is not a statement
>  1249 |         static_assert(AVCOL_TRC_NB == 19, "Update this list when adding TRCs");
>       |         ^~~~~~~~~~~~~
> make: *** [ffbuild/common.mak:81: libswscale/format.o] Error 1
> make: *** Waiting for unfinished jobs....

Fixed (by moving the static_assert out of the switch/case).

>
>
> [...]
> --
> Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
>
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> People argued and fought, when they finally agreed, only rust was left.
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