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LibVideo/VP9: Pre-calculate the quantizers at the start of each frame

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Quantizers are a constant for the whole frame, except when segment
features override them, in which case they are a constant per segment
ID. We take advantage of this by pre-calculating those after reading
the quantization parameters and segmentation features for a frame.
This results in a small 1.5% improvement (~12.9s -> ~12.7s).
This commit is contained in:
Zaggy1024 2023-04-17 00:27:13 -05:00 • committed by Tim Flynn
parent 094b0d8a78
commit 90c0e1ad8f
6 changed files with 104 additions and 70 deletions
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3
Userland/Libraries/LibVideo/VP9/Parser.h
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@ -30,6 +30,7 @@ struct FrameContext;
struct TileContext;
struct BlockContext;
struct MotionVectorCandidate;
struct QuantizationParameters;
class Parser {
friend class TreeParser;
@ -61,10 +62,10 @@ private:
DecoderErrorOr<void> compute_image_size(FrameContext&);
DecoderErrorOr<InterpolationFilter> read_interpolation_filter(BigEndianInputBitStream&);
DecoderErrorOr<void> loop_filter_params(FrameContext&);
DecoderErrorOr<void> quantization_params(FrameContext&);
DecoderErrorOr<i8> read_delta_q(BigEndianInputBitStream&);
DecoderErrorOr<void> segmentation_params(FrameContext&);
DecoderErrorOr<u8> read_prob(BigEndianInputBitStream&);
static void precalculate_quantizers(FrameContext& frame_context, QuantizationParameters quantization_parameters);
DecoderErrorOr<void> parse_tile_counts(FrameContext&);
void setup_past_independence();