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LibVideo: Parameterize compound mode parsing in the VP9 decoder

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Zaggy1024 2022-11-07 01:34:48 -06:00 • committed by Andrew Kaster
parent 372a4ea8c1
commit dd18c42643
3 changed files with 51 additions and 44 deletions
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80
Userland/Libraries/LibVideo/VP9/TreeParser.cpp
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@ -306,13 +306,52 @@ ErrorOr<bool> TreeParser::parse_is_inter(BitStream& bit_stream, ProbabilityTable
return value;
}
ErrorOr<ReferenceMode> TreeParser::parse_comp_mode(BitStream& bit_stream, ProbabilityTables const& probability_table, SyntaxElementCounter& counter, ReferenceFrameType comp_fixed_ref, Optional<bool> above_single, Optional<bool> left_single, Optional<bool> above_intra, Optional<bool> left_intra, Optional<ReferenceFrameType> above_ref_frame_0, Optional<ReferenceFrameType> left_ref_frame_0)
{
// FIXME: Above and left contexts should be in structs.
// Probabilities
u8 context;
if (above_single.has_value() && left_single.has_value()) {
if (above_single.value() && left_single.value()) {
auto is_above_fixed = above_ref_frame_0.value() == comp_fixed_ref;
auto is_left_fixed = left_ref_frame_0.value() == comp_fixed_ref;
context = is_above_fixed ^ is_left_fixed;
} else if (above_single.value()) {
auto is_above_fixed = above_ref_frame_0.value() == comp_fixed_ref;
context = 2 + static_cast<u8>(is_above_fixed || above_intra.value());
} else if (left_single.value()) {
auto is_left_fixed = left_ref_frame_0.value() == comp_fixed_ref;
context = 2 + static_cast<u8>(is_left_fixed || left_intra.value());
} else {
context = 4;
}
} else if (above_single.has_value()) {
if (above_single.value())
context = above_ref_frame_0.value() == comp_fixed_ref;
else
context = 3;
} else if (left_single.has_value()) {
if (left_single.value())
context = static_cast<u8>(left_ref_frame_0.value() == comp_fixed_ref);
else
context = 3;
} else {
context = 1;
}
u8 probability = probability_table.comp_mode_prob()[context];
auto value = TRY(parse_tree_new<ReferenceMode>(bit_stream, { binary_tree }, [&](u8) { return probability; }));
increment_counter(counter.m_counts_comp_mode[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::CompMode:
case SyntaxElementType::CompRef:
case SyntaxElementType::SingleRefP1:
case SyntaxElementType::SingleRefP2:
@ -347,8 +386,6 @@ TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
u8 TreeParser::select_tree_probability(SyntaxElementType type, u8 node)
{
switch (type) {
case SyntaxElementType::CompMode:
return calculate_comp_mode_probability();
case SyntaxElementType::CompRef:
return calculate_comp_ref_probability();
case SyntaxElementType::SingleRefP1:
@ -398,40 +435,6 @@ 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_comp_mode_probability()
{
if (AVAIL_U && AVAIL_L) {
if (ABOVE_SINGLE && LEFT_SINGLE) {
auto is_above_fixed = ABOVE_FRAME_0 == m_decoder.m_comp_fixed_ref;
auto is_left_fixed = LEFT_FRAME_0 == m_decoder.m_comp_fixed_ref;
m_ctx = is_above_fixed ^ is_left_fixed;
} else if (ABOVE_SINGLE) {
auto is_above_fixed = ABOVE_FRAME_0 == m_decoder.m_comp_fixed_ref;
m_ctx = 2 + (is_above_fixed || ABOVE_INTRA);
} else if (LEFT_SINGLE) {
auto is_left_fixed = LEFT_FRAME_0 == m_decoder.m_comp_fixed_ref;
m_ctx = 2 + (is_left_fixed || LEFT_INTRA);
} else {
m_ctx = 4;
}
} else if (AVAIL_U) {
if (ABOVE_SINGLE) {
m_ctx = ABOVE_FRAME_0 == m_decoder.m_comp_fixed_ref;
} else {
m_ctx = 3;
}
} else if (AVAIL_L) {
if (LEFT_SINGLE) {
m_ctx = LEFT_FRAME_0 == m_decoder.m_comp_fixed_ref;
} else {
m_ctx = 3;
}
} else {
m_ctx = 1;
}
return m_decoder.m_probability_tables->comp_mode_prob()[m_ctx];
}
u8 TreeParser::calculate_comp_ref_probability()
{
auto fix_ref_idx = m_decoder.m_ref_frame_sign_bias[m_decoder.m_comp_fixed_ref];
@ -722,9 +725,6 @@ void TreeParser::count_syntax_element(SyntaxElementType type, int value)
increment_counter(count);
};
switch (type) {
case SyntaxElementType::CompMode:
increment(m_decoder.m_syntax_element_counter->m_counts_comp_mode[m_ctx][value]);
return;
case SyntaxElementType::CompRef:
increment(m_decoder.m_syntax_element_counter->m_counts_comp_ref[m_ctx][value]);
return;