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lavfi: add a libplacebo filter

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This filter conceptually maps the libplacebo `pl_renderer` API into
libavfilter, which is a high-level image rendering API designed to work
with an RGB pipeline internally. As such, there's no way to avoid e.g.
chroma interpolation with this filter, although new versions of
libplacebo support outputting back to subsampled YCbCr after processing
is done.

That being said, `pl_renderer` supports automatic integration of the
majority of libplacebo's shaders, ranging from debanding to tone
mapping, and also supports loading custom mpv-style user shaders, making
this API a natural candidate for getting a lot of functionality out of
relatively little code.

In the future, I may approach this problem either by rewriting this
filter to also support a non-renderer codepath, or by upgrading
libplacebo's renderer to support a full YCbCr pipeline.

This unfortunately requires a very new version of libplacebo (unreleased
at time of writing) for timeline semaphore support. But the amount of
boilerplate needed to hack in backwards compatibility would have been
very unreasonable.
This commit is contained in:
Niklas Haas
2021-07-26 00:55:37 +02:00
committed by Lynne
parent 296cb99d46
commit 51e03409d7
4 changed files with 722 additions and 0 deletions
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libavfilter/allfilters.c
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@@ -308,6 +308,7 @@ extern const AVFilter ff_vf_lagfun;
extern const AVFilter ff_vf_latency;
extern const AVFilter ff_vf_lenscorrection;
extern const AVFilter ff_vf_lensfun;
extern const AVFilter ff_vf_libplacebo;
extern const AVFilter ff_vf_libvmaf;
extern const AVFilter ff_vf_limitdiff;
extern const AVFilter ff_vf_limiter;