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LibVideo/VP9: Index inter-frame references with named fields or an enum

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Previously, we were using size_t, often coerced from bool or u8, to
index reference pairs. Now, they must either be taken directly from
named fields or indexed using the `ReferenceIndex` enum with options
`primary` and `secondary`. With a more explicit method of indexing
these, the compiler can aid in using reference pairs correctly, and
fuzzers may be able to detect undefined behavior more easily.
This commit is contained in:
Zaggy1024 2022-11-25 03:03:22 -06:00 • committed by Andreas Kling
parent 3af4deba6d
commit f4761dab09
8 changed files with 174 additions and 157 deletions
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6
Userland/Libraries/LibVideo/VP9/Parser.h
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@ -114,7 +114,7 @@ private:
DecoderErrorOr<void> inter_block_mode_info(BlockContext&, FrameBlockContext above_context, FrameBlockContext left_context);
DecoderErrorOr<void> read_ref_frames(BlockContext&, FrameBlockContext above_context, FrameBlockContext left_context);
DecoderErrorOr<MotionVectorPair> get_motion_vector(BlockContext const&, BlockMotionVectorCandidates const&);
DecoderErrorOr<MotionVector> read_motion_vector(BlockContext const&, BlockMotionVectorCandidates const&, u8 reference_index);
DecoderErrorOr<MotionVector> read_motion_vector(BlockContext const&, BlockMotionVectorCandidates const&, ReferenceIndex);
DecoderErrorOr<i32> read_single_motion_vector_component(u8 component);
DecoderErrorOr<bool> residual(BlockContext&, bool has_block_above, bool has_block_left);
DecoderErrorOr<bool> tokens(BlockContext&, size_t plane, u32 x, u32 y, TXSize tx_size, u32 block_index);
@ -123,9 +123,9 @@ private:
/* (6.5) Motion Vector Prediction */
MotionVectorPair find_reference_motion_vectors(BlockContext const&, ReferenceFrameType, i32 block);
void select_best_sub_block_reference_motion_vectors(BlockContext const&, BlockMotionVectorCandidates&, i32 block, u8 ref_list);
void select_best_sub_block_reference_motion_vectors(BlockContext const&, BlockMotionVectorCandidates&, i32 block, ReferenceIndex);
size_t get_image_index(FrameContext const&, u32 row, u32 column) const;
MotionVectorCandidate get_motion_vector_from_current_or_previous_frame(BlockContext const&, MotionVector candidate_vector, u8 ref_list, bool use_prev);
MotionVectorCandidate get_motion_vector_from_current_or_previous_frame(BlockContext const&, MotionVector candidate_vector, ReferenceIndex, bool use_prev);
void add_motion_vector_if_reference_frame_type_is_same(BlockContext const&, MotionVector candidate_vector, ReferenceFrameType ref_frame, Vector<MotionVector, 2>& list, bool use_prev);
void add_motion_vector_if_reference_frame_type_is_different(BlockContext const&, MotionVector candidate_vector, ReferenceFrameType ref_frame, Vector<MotionVector, 2>& list, bool use_prev);