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LibVideo: Parameterize parsing compound references in the VP9 decoder

This commit is contained in:
Zaggy1024 2022-11-07 02:36:30 -06:00 committed by Andrew Kaster
parent dd18c42643
commit 37fab851f1
3 changed files with 100 additions and 93 deletions

View file

@ -346,13 +346,94 @@ ErrorOr<ReferenceMode> TreeParser::parse_comp_mode(BitStream& bit_stream, Probab
return value;
}
ErrorOr<bool> TreeParser::parse_comp_ref(BitStream& bit_stream, ProbabilityTables const& probability_table, SyntaxElementCounter& counter, ReferenceFrameType comp_fixed_ref, ReferenceFramePair comp_var_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, Optional<ReferenceFrameType> above_ref_frame_biased, Optional<ReferenceFrameType> left_ref_frame_biased)
{
// FIXME: Above and left contexts should be in structs.
// Probabilities
u8 context;
if (above_intra.has_value() && left_intra.has_value()) {
if (above_intra.value() && left_intra.value()) {
context = 2;
} else if (left_intra.value()) {
if (above_single.value()) {
context = 1 + 2 * (above_ref_frame_0.value() != comp_var_ref[1]);
} else {
context = 1 + 2 * (above_ref_frame_biased.value() != comp_var_ref[1]);
}
} else if (above_intra.value()) {
if (left_single.value()) {
context = 1 + 2 * (left_ref_frame_0.value() != comp_var_ref[1]);
} else {
context = 1 + 2 * (left_ref_frame_biased != comp_var_ref[1]);
}
} else {
auto var_ref_above = above_single.value() ? above_ref_frame_0 : above_ref_frame_biased;
auto var_ref_left = left_single.value() ? left_ref_frame_0 : left_ref_frame_biased;
if (var_ref_above == var_ref_left && comp_var_ref[1] == var_ref_above) {
context = 0;
} else if (left_single.value() && above_single.value()) {
if ((var_ref_above == comp_fixed_ref && var_ref_left == comp_var_ref[0])
|| (var_ref_left == comp_fixed_ref && var_ref_above == comp_var_ref[0])) {
context = 4;
} else if (var_ref_above == var_ref_left) {
context = 3;
} else {
context = 1;
}
} else if (left_single.value() || above_single.value()) {
auto vrfc = left_single.value() ? var_ref_above : var_ref_left;
auto rfs = above_single.value() ? var_ref_above : var_ref_left;
if (vrfc == comp_var_ref[1] && rfs != comp_var_ref[1]) {
context = 1;
} else if (rfs == comp_var_ref[1] && vrfc != comp_var_ref[1]) {
context = 2;
} else {
context = 4;
}
} else if (var_ref_above == var_ref_left) {
context = 4;
} else {
context = 2;
}
}
} else if (above_intra.has_value()) {
if (above_intra.value()) {
context = 2;
} else {
if (above_single.value()) {
context = 3 * static_cast<u8>(above_ref_frame_0.value() != comp_var_ref[1]);
} else {
context = 4 * static_cast<u8>(above_ref_frame_biased.value() != comp_var_ref[1]);
}
}
} else if (left_intra.has_value()) {
if (left_intra.value()) {
context = 2;
} else {
if (left_single.value()) {
context = 3 * static_cast<u8>(left_ref_frame_0.value() != comp_var_ref[1]);
} else {
context = 4 * static_cast<u8>(left_ref_frame_biased != comp_var_ref[1]);
}
}
} else {
context = 2;
}
u8 probability = probability_table.comp_ref_prob()[context];
auto value = TRY(parse_tree_new<bool>(bit_stream, { binary_tree }, [&](u8) { return probability; }));
increment_counter(counter.m_counts_comp_ref[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::CompRef:
case SyntaxElementType::SingleRefP1:
case SyntaxElementType::SingleRefP2:
case SyntaxElementType::MVSign:
@ -386,8 +467,6 @@ TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
u8 TreeParser::select_tree_probability(SyntaxElementType type, u8 node)
{
switch (type) {
case SyntaxElementType::CompRef:
return calculate_comp_ref_probability();
case SyntaxElementType::SingleRefP1:
return calculate_single_ref_p1_probability();
case SyntaxElementType::SingleRefP2:
@ -435,82 +514,6 @@ 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_ref_probability()
{
auto fix_ref_idx = m_decoder.m_ref_frame_sign_bias[m_decoder.m_comp_fixed_ref];
auto var_ref_idx = !fix_ref_idx;
if (AVAIL_U && AVAIL_L) {
if (ABOVE_INTRA && LEFT_INTRA) {
m_ctx = 2;
} else if (LEFT_INTRA) {
if (ABOVE_SINGLE) {
m_ctx = 1 + 2 * (ABOVE_FRAME_0 != m_decoder.m_comp_var_ref[1]);
} else {
m_ctx = 1 + 2 * (m_decoder.m_above_ref_frame[var_ref_idx] != m_decoder.m_comp_var_ref[1]);
}
} else if (ABOVE_INTRA) {
if (LEFT_SINGLE) {
m_ctx = 1 + 2 * (LEFT_FRAME_0 != m_decoder.m_comp_var_ref[1]);
} else {
m_ctx = 1 + 2 * (m_decoder.m_left_ref_frame[var_ref_idx] != m_decoder.m_comp_var_ref[1]);
}
} else {
auto var_ref_above = m_decoder.m_above_ref_frame[ABOVE_SINGLE ? 0 : var_ref_idx];
auto var_ref_left = m_decoder.m_left_ref_frame[LEFT_SINGLE ? 0 : var_ref_idx];
if (var_ref_above == var_ref_left && m_decoder.m_comp_var_ref[1] == var_ref_above) {
m_ctx = 0;
} else if (LEFT_SINGLE && ABOVE_SINGLE) {
if ((var_ref_above == m_decoder.m_comp_fixed_ref && var_ref_left == m_decoder.m_comp_var_ref[0])
|| (var_ref_left == m_decoder.m_comp_fixed_ref && var_ref_above == m_decoder.m_comp_var_ref[0])) {
m_ctx = 4;
} else if (var_ref_above == var_ref_left) {
m_ctx = 3;
} else {
m_ctx = 1;
}
} else if (LEFT_SINGLE || ABOVE_SINGLE) {
auto vrfc = LEFT_SINGLE ? var_ref_above : var_ref_left;
auto rfs = ABOVE_SINGLE ? var_ref_above : var_ref_left;
if (vrfc == m_decoder.m_comp_var_ref[1] && rfs != m_decoder.m_comp_var_ref[1]) {
m_ctx = 1;
} else if (rfs == m_decoder.m_comp_var_ref[1] && vrfc != m_decoder.m_comp_var_ref[1]) {
m_ctx = 2;
} else {
m_ctx = 4;
}
} else if (var_ref_above == var_ref_left) {
m_ctx = 4;
} else {
m_ctx = 2;
}
}
} else if (AVAIL_U) {
if (ABOVE_INTRA) {
m_ctx = 2;
} else {
if (ABOVE_SINGLE) {
m_ctx = 3 * (ABOVE_FRAME_0 != m_decoder.m_comp_var_ref[1]);
} else {
m_ctx = 4 * (m_decoder.m_above_ref_frame[var_ref_idx] != m_decoder.m_comp_var_ref[1]);
}
}
} else if (AVAIL_L) {
if (LEFT_INTRA) {
m_ctx = 2;
} else {
if (LEFT_SINGLE) {
m_ctx = 3 * (LEFT_FRAME_0 != m_decoder.m_comp_var_ref[1]);
} else {
m_ctx = 4 * (m_decoder.m_left_ref_frame[var_ref_idx] != m_decoder.m_comp_var_ref[1]);
}
}
} else {
m_ctx = 2;
}
return m_decoder.m_probability_tables->comp_ref_prob()[m_ctx];
}
u8 TreeParser::calculate_single_ref_p1_probability()
{
if (AVAIL_U && AVAIL_L) {
@ -725,9 +728,6 @@ void TreeParser::count_syntax_element(SyntaxElementType type, int value)
increment_counter(count);
};
switch (type) {
case SyntaxElementType::CompRef:
increment(m_decoder.m_syntax_element_counter->m_counts_comp_ref[m_ctx][value]);
return;
case SyntaxElementType::SingleRefP1:
increment(m_decoder.m_syntax_element_counter->m_counts_single_ref[m_ctx][0][value]);
return;