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LibVideo: Parameterize coefficient skip parsing for VP9

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This commit is contained in:
Zaggy1024 2022-11-06 21:27:00 -06:00 • committed by Andrew Kaster
parent 10ba956066
commit cc735a7001
3 changed files with 20 additions and 20 deletions
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9
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -1072,10 +1072,13 @@ DecoderErrorOr<void> Parser::intra_segment_id()
DecoderErrorOr<void> Parser::read_skip()
{
if (seg_feature_active(SEG_LVL_SKIP))
if (seg_feature_active(SEG_LVL_SKIP)) {
m_skip = true;
else
m_skip = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::Skip));
} else {
Optional<bool> above_skip = m_available_u ? m_skips[get_image_index(m_mi_row - 1, m_mi_col)] : Optional<bool>();
Optional<bool> left_skip = m_available_l ? m_skips[get_image_index(m_mi_row, m_mi_col - 1)] : Optional<bool>();
m_skip = TRY_READ(TreeParser::parse_skip(*m_bit_stream, *m_probability_tables, *m_syntax_element_counter, above_skip, left_skip));
}
return {};
}

29
Userland/Libraries/LibVideo/VP9/TreeParser.cpp
View file

@ -244,13 +244,25 @@ ErrorOr<InterpolationFilter> TreeParser::parse_interpolation_filter(BitStream& b
return value;
}
ErrorOr<bool> TreeParser::parse_skip(BitStream& bit_stream, ProbabilityTables const& probability_table, SyntaxElementCounter& counter, Optional<bool> const& above_skip, Optional<bool> const& left_skip)
{
// Probabilities
u8 context = 0;
context += static_cast<u8>(above_skip.value_or(false));
context += static_cast<u8>(left_skip.value_or(false));
u8 probability = probability_table.skip_prob()[context];
auto value = TRY(parse_tree_new<bool>(bit_stream, { binary_tree }, [&](u8) { return probability; }));
increment_counter(counter.m_counts_skip[context][value]);
return value;
}
/*
* Select a tree value based on the type of syntax element being parsed, as well as some parser state, as specified in section 9.3.1
*/
TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
{
switch (type) {
case SyntaxElementType::Skip:
case SyntaxElementType::IsInter:
case SyntaxElementType::CompMode:
case SyntaxElementType::CompRef:
@ -293,8 +305,6 @@ TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
u8 TreeParser::select_tree_probability(SyntaxElementType type, u8 node)
{
switch (type) {
case SyntaxElementType::Skip:
return calculate_skip_probability();
case SyntaxElementType::IsInter:
return calculate_is_inter_probability();
case SyntaxElementType::CompMode:
@ -350,16 +360,6 @@ u8 TreeParser::select_tree_probability(SyntaxElementType type, u8 node)
#define ABOVE_SINGLE m_decoder.m_above_single
#define LEFT_SINGLE m_decoder.m_left_single
u8 TreeParser::calculate_skip_probability()
{
m_ctx = 0;
if (AVAIL_U)
m_ctx += m_decoder.m_skips[(m_decoder.m_mi_row - 1) * m_decoder.m_mi_cols + m_decoder.m_mi_col];
if (AVAIL_L)
m_ctx += m_decoder.m_skips[m_decoder.m_mi_row * m_decoder.m_mi_cols + m_decoder.m_mi_col - 1];
return m_decoder.m_probability_tables->skip_prob()[m_ctx];
}
u8 TreeParser::calculate_is_inter_probability()
{
if (AVAIL_U && AVAIL_L) {
@ -718,9 +718,6 @@ void TreeParser::count_syntax_element(SyntaxElementType type, int value)
increment_counter(count);
};
switch (type) {
case SyntaxElementType::Skip:
increment(m_decoder.m_syntax_element_counter->m_counts_skip[m_ctx][value]);
return;
case SyntaxElementType::IsInter:
increment(m_decoder.m_syntax_element_counter->m_counts_is_inter[m_ctx][value]);
return;

2
Userland/Libraries/LibVideo/VP9/TreeParser.h
View file

@ -72,6 +72,7 @@ public:
static ErrorOr<bool> parse_segment_id_predicted(BitStream&, u8 const probabilities[3], u8 above_seg_pred_context, u8 left_seg_pred_context);
static ErrorOr<PredictionMode> parse_inter_mode(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, u8 mode_context_for_ref_frame_0);
static ErrorOr<InterpolationFilter> parse_interpolation_filter(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, Optional<ReferenceFrameType> above_ref_frame, Optional<ReferenceFrameType> left_ref_frame, Optional<InterpolationFilter> above_interpolation_filter, Optional<InterpolationFilter> left_interpolation_filter);
static ErrorOr<bool> parse_skip(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, Optional<bool> const& above_skip, Optional<bool> const& left_skip);
void set_default_intra_mode_variables(u8 idx, u8 idy)
{
@ -105,7 +106,6 @@ public:
}
private:
u8 calculate_skip_probability();
u8 calculate_is_inter_probability();
u8 calculate_comp_mode_probability();
u8 calculate_comp_ref_probability();