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LibGfx/LibVideo: Check for overreads only at end of a VPX range decode

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Errors are now deferred until `finish_decode()` is finished, meaning
branches to return errors only need to occur at the end of a ranged
decode. If VPX_DEBUG is enabled, a debug message will be printed
immediately when an overread occurs.

Average decoding times for `Tests/LibGfx/test-inputs/4.webp` improve
by about 4.7% with this change, absolute decode times changing from
27.4ms±1.1ms down to 26.1ms±1.0ms.
This commit is contained in:
Zaggy1024 2023-06-01 19:16:57 -05:00 • committed by Andreas Kling
parent 873b0e9470
commit 24ae35086d
8 changed files with 353 additions and 366 deletions
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56
Userland/Libraries/LibVideo/VP9/TreeParser.h
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@ -30,38 +30,38 @@ struct TokensContext {
class TreeParser {
public:
static ErrorOr<Partition> parse_partition(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, bool has_rows, bool has_columns, BlockSubsize block_subsize, u8 num_8x8, PartitionContextView above_partition_context, PartitionContextView left_partition_context, u32 row, u32 column, bool frame_is_intra);
static ErrorOr<PredictionMode> parse_default_intra_mode(BooleanDecoder&, ProbabilityTables const&, BlockSubsize mi_size, FrameBlockContext above, FrameBlockContext left, Array<PredictionMode, 4> const& block_sub_modes, u8 index_x, u8 index_y);
static ErrorOr<PredictionMode> parse_default_uv_mode(BooleanDecoder&, ProbabilityTables const&, PredictionMode y_mode);
static ErrorOr<PredictionMode> parse_intra_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, BlockSubsize mi_size);
static ErrorOr<PredictionMode> parse_sub_intra_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&);
static ErrorOr<PredictionMode> parse_uv_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, PredictionMode y_mode);
static ErrorOr<u8> parse_segment_id(BooleanDecoder&, Array<u8, 7> const& probabilities);
static ErrorOr<bool> parse_segment_id_predicted(BooleanDecoder&, Array<u8, 3> const& probabilities, u8 above_seg_pred_context, u8 left_seg_pred_context);
static ErrorOr<PredictionMode> parse_inter_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 mode_context_for_ref_frame_0);
static ErrorOr<InterpolationFilter> parse_interpolation_filter(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<bool> parse_skip(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<TransformSize> parse_tx_size(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TransformSize max_tx_size, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<bool> parse_block_is_inter_predicted(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<ReferenceMode> parse_comp_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, ReferenceFrameType comp_fixed_ref, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<ReferenceIndex> parse_comp_ref(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, ReferenceFrameType comp_fixed_ref, ReferenceFramePair comp_var_ref, ReferenceIndex variable_reference_index, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<bool> parse_single_ref_part_1(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<bool> parse_single_ref_part_2(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static Partition parse_partition(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, bool has_rows, bool has_columns, BlockSubsize block_subsize, u8 num_8x8, PartitionContextView above_partition_context, PartitionContextView left_partition_context, u32 row, u32 column, bool frame_is_intra);
static PredictionMode parse_default_intra_mode(BooleanDecoder&, ProbabilityTables const&, BlockSubsize mi_size, FrameBlockContext above, FrameBlockContext left, Array<PredictionMode, 4> const& block_sub_modes, u8 index_x, u8 index_y);
static PredictionMode parse_default_uv_mode(BooleanDecoder&, ProbabilityTables const&, PredictionMode y_mode);
static PredictionMode parse_intra_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, BlockSubsize mi_size);
static PredictionMode parse_sub_intra_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&);
static PredictionMode parse_uv_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, PredictionMode y_mode);
static u8 parse_segment_id(BooleanDecoder&, Array<u8, 7> const& probabilities);
static bool parse_segment_id_predicted(BooleanDecoder&, Array<u8, 3> const& probabilities, u8 above_seg_pred_context, u8 left_seg_pred_context);
static PredictionMode parse_inter_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 mode_context_for_ref_frame_0);
static InterpolationFilter parse_interpolation_filter(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static bool parse_skip(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static TransformSize parse_tx_size(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TransformSize max_tx_size, FrameBlockContext above, FrameBlockContext left);
static bool parse_block_is_inter_predicted(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ReferenceMode parse_comp_mode(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, ReferenceFrameType comp_fixed_ref, FrameBlockContext above, FrameBlockContext left);
static ReferenceIndex parse_comp_ref(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, ReferenceFrameType comp_fixed_ref, ReferenceFramePair comp_var_ref, ReferenceIndex variable_reference_index, FrameBlockContext above, FrameBlockContext left);
static bool parse_single_ref_part_1(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static bool parse_single_ref_part_2(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, FrameBlockContext above, FrameBlockContext left);
static ErrorOr<MvJoint> parse_motion_vector_joint(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&);
static ErrorOr<bool> parse_motion_vector_sign(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static ErrorOr<MvClass> parse_motion_vector_class(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static ErrorOr<bool> parse_motion_vector_class0_bit(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static ErrorOr<u8> parse_motion_vector_class0_fr(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool class_0_bit);
static ErrorOr<bool> parse_motion_vector_class0_hp(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool use_hp);
static ErrorOr<bool> parse_motion_vector_bit(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, u8 bit_index);
static ErrorOr<u8> parse_motion_vector_fr(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static ErrorOr<bool> parse_motion_vector_hp(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool use_hp);
static MvJoint parse_motion_vector_joint(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&);
static bool parse_motion_vector_sign(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static MvClass parse_motion_vector_class(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static bool parse_motion_vector_class0_bit(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static u8 parse_motion_vector_class0_fr(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool class_0_bit);
static bool parse_motion_vector_class0_hp(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool use_hp);
static bool parse_motion_vector_bit(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, u8 bit_index);
static u8 parse_motion_vector_fr(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static bool parse_motion_vector_hp(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool use_hp);
static TokensContext get_context_for_first_token(NonZeroTokensView above_non_zero_tokens, NonZeroTokensView left_non_zero_tokens, TransformSize transform_size, u8 plane, u32 sub_block_column, u32 sub_block_row, bool is_inter, u8 band);
static TokensContext get_context_for_other_tokens(Array<u8, 1024> token_cache, TransformSize transform_size, TransformSet transform_set, u8 plane, u16 token_position, bool is_inter, u8 band);
static ErrorOr<bool> parse_more_coefficients(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
static ErrorOr<Token> parse_token(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
static bool parse_more_coefficients(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
static Token parse_token(BooleanDecoder&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
};
struct PartitionTreeContext {