Zaggy1024 bc49af08b4 LibVideo/VP9: Pre-calculate inter-frames' reference frame scale factors ...

Changing the calculation of reference frame scale factors to be done on
a per-frame basis reduces the amount of work done in
`predict_inter_block()`, which is a big hotspot in most videos.

This reduces decode times in a test video from YouTube by about 5%
(~37.2s -> ~35.4s).

2023-04-14 07:11:45 -04:00

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