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

[Lauri Kasanen]

On Thu,  9 May 2019 22:59:12 -0700
Philip Langdale <philipl at overt.org> 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.

I'm having trouble making out what formats exactly isSemiPlanarYUV()
matches. Are you sure it's an equivalent check?

- Lauri