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

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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).
This commit is contained in:
Zaggy1024 2023-04-13 13:31:48 -05:00 • committed by Tim Flynn
parent 5cd5edc3bd
commit bc49af08b4
4 changed files with 88 additions and 43 deletions
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2
Userland/Libraries/LibVideo/VP9/Decoder.h
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@ -59,6 +59,8 @@ private:
// (8.5.1) Intra prediction process
DecoderErrorOr<void> predict_intra(u8 plane, BlockContext const& block_context, u32 x, u32 y, bool have_left, bool have_above, bool not_on_right, TransformSize transform_size, u32 block_index);
DecoderErrorOr<void> prepare_referenced_frame(Gfx::Size<u32> frame_size, u8 reference_frame_index);
// (8.5.1) Inter prediction process
DecoderErrorOr<void> predict_inter(u8 plane, BlockContext const& block_context, u32 x, u32 y, u32 width, u32 height, u32 block_index);
// (8.5.2.1) Motion vector selection process