[FFmpeg-devel] [PATCH 1/2] libavutil: introduce AVFilmGrainParams side data

[Lynne]

This patch introduces a new frame side data type AVFilmGrainParams for use 
with video codecs able to offload film grain application during presentation.

It is generalized rather than being AV1 specific as AV2 is expected to carry
the same data, as well as the fact it was based on general research of
film grain synthesis.

This patch also introduces an option to export this side data from compatible
decoders. It will be used in the next patch.

Patch attached.

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