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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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3
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -220,6 +220,9 @@ DecoderErrorOr<void> Parser::uncompressed_header(FrameContext& frame_context)
render_size = TRY(parse_render_size(frame_context.bit_stream, frame_size));
frame_context.high_precision_motion_vectors_allowed = TRY_READ(frame_context.bit_stream.read_bit());
frame_context.interpolation_filter = TRY(read_interpolation_filter(frame_context.bit_stream));
for (auto i = 0; i < REFS_PER_FRAME; i++) {
TRY(m_decoder.prepare_referenced_frame(frame_size, frame_context.reference_frame_indices[i]));
}
}
}