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LibVideo: Parameterize segment ID parsing for the VP9 decoder

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This commit is contained in:
Zaggy1024 2022-11-06 21:08:03 -06:00 • committed by Andrew Kaster
parent 568e2fc1f2
commit 10ba956066
3 changed files with 21 additions and 28 deletions
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8
Userland/Libraries/LibVideo/VP9/Parser.cpp
View file

@ -1064,7 +1064,7 @@ DecoderErrorOr<void> Parser::intra_frame_mode_info()
DecoderErrorOr<void> Parser::intra_segment_id()
{
if (m_segmentation_enabled && m_segmentation_update_map)
m_segment_id = TRY_READ(m_tree_parser->parse_tree<u8>(SyntaxElementType::SegmentID));
m_segment_id = TRY_READ(TreeParser::parse_segment_id(*m_bit_stream, m_segmentation_tree_probs));
else
m_segment_id = 0;
return {};
@ -1128,15 +1128,15 @@ DecoderErrorOr<void> Parser::inter_segment_id()
return {};
}
if (!m_segmentation_temporal_update) {
m_segment_id = TRY_READ(m_tree_parser->parse_tree<u8>(SyntaxElementType::SegmentID));
m_segment_id = TRY_READ(TreeParser::parse_segment_id(*m_bit_stream, m_segmentation_tree_probs));
return {};
}
auto seg_id_predicted = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::SegIDPredicted));
auto seg_id_predicted = TRY_READ(TreeParser::parse_segment_id_predicted(*m_bit_stream, m_segmentation_pred_prob, m_left_seg_pred_context[m_mi_row], m_above_seg_pred_context[m_mi_col]));
if (seg_id_predicted)
m_segment_id = predicted_segment_id;
else
m_segment_id = TRY_READ(m_tree_parser->parse_tree<u8>(SyntaxElementType::SegmentID));
m_segment_id = TRY_READ(TreeParser::parse_segment_id(*m_bit_stream, m_segmentation_tree_probs));
for (size_t i = 0; i < num_8x8_blocks_wide_lookup[m_mi_size]; i++) {
auto index = m_mi_col + i;

37
Userland/Libraries/LibVideo/VP9/TreeParser.cpp
View file

@ -187,6 +187,21 @@ ErrorOr<PredictionMode> TreeParser::parse_uv_mode(BitStream& bit_stream, Probabi
return value;
}
ErrorOr<u8> TreeParser::parse_segment_id(BitStream& bit_stream, u8 const probabilities[7])
{
auto value = TRY(parse_tree_new<u8>(bit_stream, { segment_tree }, [&](u8 node) { return probabilities[node]; }));
// Segment ID is not counted.
return value;
}
ErrorOr<bool> TreeParser::parse_segment_id_predicted(BitStream& bit_stream, u8 const probabilities[3], u8 above_seg_pred_context, u8 left_seg_pred_context)
{
auto context = left_seg_pred_context + above_seg_pred_context;
auto value = TRY(parse_tree_new<bool>(bit_stream, { binary_tree }, [&](u8) { return probabilities[context]; }));
// Segment ID prediction is not counted.
return value;
}
ErrorOr<PredictionMode> TreeParser::parse_inter_mode(BitStream& bit_stream, ProbabilityTables const& probability_table, SyntaxElementCounter& counter, u8 mode_context_for_ref_frame_0)
{
// Tree
@ -235,10 +250,7 @@ ErrorOr<InterpolationFilter> TreeParser::parse_interpolation_filter(BitStream& b
TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
{
switch (type) {
case SyntaxElementType::SegmentID:
return { segment_tree };
case SyntaxElementType::Skip:
case SyntaxElementType::SegIDPredicted:
case SyntaxElementType::IsInter:
case SyntaxElementType::CompMode:
case SyntaxElementType::CompRef:
@ -281,12 +293,8 @@ TreeParser::TreeSelection TreeParser::select_tree(SyntaxElementType type)
u8 TreeParser::select_tree_probability(SyntaxElementType type, u8 node)
{
switch (type) {
case SyntaxElementType::SegmentID:
return calculate_segment_id_probability(node);
case SyntaxElementType::Skip:
return calculate_skip_probability();
case SyntaxElementType::SegIDPredicted:
return calculate_seg_id_predicted_probability();
case SyntaxElementType::IsInter:
return calculate_is_inter_probability();
case SyntaxElementType::CompMode:
@ -342,11 +350,6 @@ 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_segment_id_probability(u8 node)
{
return m_decoder.m_segmentation_tree_probs[node];
}
u8 TreeParser::calculate_skip_probability()
{
m_ctx = 0;
@ -357,12 +360,6 @@ u8 TreeParser::calculate_skip_probability()
return m_decoder.m_probability_tables->skip_prob()[m_ctx];
}
u8 TreeParser::calculate_seg_id_predicted_probability()
{
m_ctx = m_decoder.m_left_seg_pred_context[m_decoder.m_mi_row] + m_decoder.m_above_seg_pred_context[m_decoder.m_mi_col];
return m_decoder.m_segmentation_pred_prob[m_ctx];
}
u8 TreeParser::calculate_is_inter_probability()
{
if (AVAIL_U && AVAIL_L) {
@ -779,10 +776,6 @@ void TreeParser::count_syntax_element(SyntaxElementType type, int value)
case SyntaxElementType::MoreCoefs:
increment(m_decoder.m_syntax_element_counter->m_counts_more_coefs[m_tx_size][m_plane > 0][m_decoder.m_is_inter][m_band][m_ctx][value]);
return;
case SyntaxElementType::SegmentID:
case SyntaxElementType::SegIDPredicted:
// No counting required
return;
default:
break;
}

4
Userland/Libraries/LibVideo/VP9/TreeParser.h
View file

@ -68,6 +68,8 @@ public:
static ErrorOr<PredictionMode> parse_intra_mode(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, BlockSubsize mi_size);
static ErrorOr<PredictionMode> parse_sub_intra_mode(BitStream&, ProbabilityTables const&, SyntaxElementCounter&);
static ErrorOr<PredictionMode> parse_uv_mode(BitStream&, ProbabilityTables const&, SyntaxElementCounter&, PredictionMode y_mode);
static ErrorOr<u8> parse_segment_id(BitStream&, u8 const probabilities[7]);
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);
@ -103,9 +105,7 @@ public:
}
private:
u8 calculate_segment_id_probability(u8 node);
u8 calculate_skip_probability();
u8 calculate_seg_id_predicted_probability();
u8 calculate_is_inter_probability();
u8 calculate_comp_mode_probability();
u8 calculate_comp_ref_probability();