[FFmpeg-devel] [PATCH] swscale: Add support for NV24 and NV42

Michael Niedermayer michael at niedermayer.cc
Sat May 11 18:40:41 EEST 2019


On Thu, May 09, 2019 at 10:59:12PM -0700, Philip Langdale wrote:
> I don't think this is terribly useful, as the only thing out there that
> can even handle NV24 content is VDPAU and the only time you have to
> deal with it is when doing VDPAU OpenGL interop where swscale is
> irrelevant. In the other cases you can use YV24 (YUV444P).
> 
> But anyway, I was asked to do this for the sake of completeness.
> 
> The implementation is pretty straight-forward. Most of the existing
> NV12 codepaths work regardless of subsampling and are re-used as is.
> Where necessary I wrote the slightly different NV24 versions.
> 
> Finally, the one thing that confused me for a long time was the
> asm specific x86 path that did an explicit exclusion check for NV12.
> I replaced that with a semi-planar check and also updated the
> equivalent PPC code, but which I cannot test.
> 
> Signed-off-by: Philip Langdale <philipl at overt.org>
> ---
>  libswscale/input.c                       |  2 +
>  libswscale/output.c                      |  6 ++-
>  libswscale/ppc/swscale_altivec.c         |  3 +-
>  libswscale/ppc/swscale_vsx.c             |  3 +-
>  libswscale/swscale_unscaled.c            | 51 ++++++++++++++++++++++++
>  libswscale/utils.c                       |  2 +
>  libswscale/version.h                     |  2 +-
>  libswscale/x86/swscale_template.c        |  4 +-
>  tests/ref/fate/filter-pixfmts-copy       |  2 +
>  tests/ref/fate/filter-pixfmts-crop       |  2 +
>  tests/ref/fate/filter-pixfmts-field      |  2 +
>  tests/ref/fate/filter-pixfmts-fieldorder |  2 +
>  tests/ref/fate/filter-pixfmts-hflip      |  2 +
>  tests/ref/fate/filter-pixfmts-il         |  2 +
>  tests/ref/fate/filter-pixfmts-null       |  2 +
>  tests/ref/fate/filter-pixfmts-pad        |  2 +
>  tests/ref/fate/filter-pixfmts-scale      |  2 +
>  tests/ref/fate/filter-pixfmts-transpose  |  2 +
>  tests/ref/fate/filter-pixfmts-vflip      |  2 +
>  19 files changed, 86 insertions(+), 9 deletions(-)

was this tested with up/down scaling ?

thanks

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

There will always be a question for which you do not know the correct answer.
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