Re: [FFmpeg-devel] [RFC]] swscale modernization proposal

[Niklas Haas <ffmpeg@haasn.xyz>]

On Tue, 02 Jul 2024 15:27:00 +0200 Niklas Haas <ffmpeg@haasn.xyz> wrote:
 
> 1. Is this a good idea, or too confusing / complex to be worth the gain?
>    Specifically, I am worried about confusion arising due to differences
>    in behavior, and implemented options, between all of the above.
> 
>    That said, I think there is a big win to be had from unifying all of
>    the different scaling and/or conversion filters we have in e.g.
>    libavfilter, as well as making it trivial for users of this API to
>    try using e.g. GPU scaling instead of CPU scaling.

After prototyping this approach a bit (using an internal struct
AVScaleBackend), I think I like it. It specifically makes handling
unscaled special converters pretty straightforward, for example - the
"unscaled" backend can be separate from the generic/scaling backend.

We could also trivially plug in something like libyuv, or some other
limited-use-case fast path, without the user really noticing.
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