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LibVideo: Create TokensContext struct for token parsing parameters

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With the addition of this struct, both the bool to determine if coefs
should be parsed and the token parse itself can take specific
parameters.

This is the last step in parameterizing all the tree parsing, so the
old functions in TreeParser are now unused. This patch is very
satisfying :^)

There's still more work to be done to clean up how the parameters are
passed from Parser, but that's work for another day.
This commit is contained in:
Zaggy1024 2022-11-07 05:04:37 -06:00 • committed by Andrew Kaster
parent e906bcc696
commit 907816e629
6 changed files with 63 additions and 220 deletions
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58
Userland/Libraries/LibVideo/VP9/TreeParser.h
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@ -19,11 +19,6 @@ class Parser;
class TreeParser {
public:
explicit TreeParser(Parser& decoder)
: m_decoder(decoder)
{
}
// FIXME: Move or remove this class once it is unused in the header.
class TreeSelection {
public:
@ -53,16 +48,6 @@ public:
TreeSelectionValue m_value;
};
/* (9.3.3) */
template<typename T = int>
ErrorOr<T> parse_tree(SyntaxElementType type);
/* (9.3.1) */
TreeSelection select_tree(SyntaxElementType type);
/* (9.3.2) */
u8 select_tree_probability(SyntaxElementType type, u8 node);
/* (9.3.4) */
void count_syntax_element(SyntaxElementType type, int value);
static ErrorOr<Partition> parse_partition(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, bool has_rows, bool has_columns, BlockSubsize block_subsize, u8 num_8x8, Vector<u8> const& above_partition_context, Vector<u8> const& left_partition_context, u32 row, u32 column, bool frame_is_intra);
static ErrorOr<PredictionMode> parse_default_intra_mode(BitStream&, ProbabilityTables const&, BlockSubsize mi_size, Optional<Array<PredictionMode, 4> const&> above_context, Optional<Array<PredictionMode, 4> const&> left_context, PredictionMode block_sub_modes[4], u8 index_x, u8 index_y);
static ErrorOr<PredictionMode> parse_default_uv_mode(BitStream&, ProbabilityTables const&, PredictionMode y_mode);
@ -91,46 +76,9 @@ public:
static ErrorOr<u8> parse_motion_vector_fr(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, u8 component);
static ErrorOr<bool> parse_motion_vector_hp(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, u8 component, bool use_hp);
void set_default_intra_mode_variables(u8 idx, u8 idy)
{
m_idx = idx;
m_idy = idy;
}
void set_tokens_variables(u8 band, u32 c, u32 plane, TXSize tx_size, u32 pos);
void set_start_x_and_y(u32 start_x, u32 start_y)
{
m_start_x = start_x;
m_start_y = start_y;
}
private:
u8 calculate_token_probability(u8 node);
u8 calculate_more_coefs_probability();
Parser& m_decoder;
// m_ctx is a member variable because it is required for syntax element counting (section 9.3.4)
u8 m_ctx { 0 };
// These are variables necessary for parsing tree data, but aren't useful otherwise, so they're
// not stored in the Decoder itself.
u8 m_idx { 0 };
u8 m_idy { 0 };
u8 m_band { 0 };
u32 m_start_x { 0 };
u32 m_start_y { 0 };
u32 m_c { 0 };
u32 m_plane { 0 };
TXSize m_tx_size;
u32 m_pos { 0 };
u8 m_mv_component { 0 };
// 0xFF indicates the value has not been set.
// parse_mv_bit should be called to set this.
u8 m_mv_bit { 0xFF };
// 0xFF indicates the value has not been set.
// parse_mv_class0_fr should be called to set this.
u8 m_mv_class0_bit { 0xFF };
static TokensContext get_tokens_context(bool subsampling_x, bool subsampling_y, u32 rows, u32 columns, Array<Vector<bool>, 3> const& above_nonzero_context, Array<Vector<bool>, 3> const& left_nonzero_context, u8 token_cache[1024], TXSize tx_size, u8 tx_type, u8 plane, u32 start_x, u32 start_y, u32 position, bool is_inter, u8 band, u32 c);
static ErrorOr<bool> parse_more_coefficients(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
static ErrorOr<Token> parse_token(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, TokensContext const& context);
};
struct PartitionTreeContext {