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LibVideo: Parameterize parsing of the default VP9 intra mode tree

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Zaggy1024 2022-11-06 19:18:03 -06:00 • committed by Andrew Kaster
parent fce7639c90
commit c6ecad63d0
4 changed files with 56 additions and 39 deletions
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24
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -1017,8 +1017,19 @@ DecoderErrorOr<void> Parser::intra_frame_mode_info()
m_ref_frame[0] = IntraFrame;
m_ref_frame[1] = None;
m_is_inter = false;
// FIXME: This if statement is also present in parse_default_intra_mode. The selection of parameters for
// the probability table lookup should be inlined here.
if (m_mi_size >= Block_8x8) {
m_default_intra_mode = TRY_READ(m_tree_parser->parse_tree<PredictionMode>(SyntaxElementType::DefaultIntraMode));
// FIXME: This context should be available in the block setup. Make a struct to store the context
// that is needed to call the tree parses and set it in decode_block().
auto above_context = Optional<Array<PredictionMode, 4> const&>();
auto left_context = Optional<Array<PredictionMode, 4> const&>();
if (m_available_u)
above_context = m_sub_modes[get_image_index(m_mi_row - 1, m_mi_col)];
if (m_available_l)
left_context = m_sub_modes[get_image_index(m_mi_row, m_mi_col - 1)];
m_default_intra_mode = TRY_READ(TreeParser::parse_default_intra_mode(*m_bit_stream, *m_probability_tables, m_mi_size, above_context, left_context, m_block_sub_modes, 0, 0));
m_y_mode = m_default_intra_mode;
for (auto& block_sub_mode : m_block_sub_modes)
block_sub_mode = m_y_mode;
@ -1027,8 +1038,15 @@ DecoderErrorOr<void> Parser::intra_frame_mode_info()
m_num_4x4_h = num_4x4_blocks_high_lookup[m_mi_size];
for (auto idy = 0; idy < 2; idy += m_num_4x4_h) {
for (auto idx = 0; idx < 2; idx += m_num_4x4_w) {
m_tree_parser->set_default_intra_mode_variables(idx, idy);
m_default_intra_mode = TRY_READ(m_tree_parser->parse_tree<PredictionMode>(SyntaxElementType::DefaultIntraMode));
// FIXME: See the FIXME above.
auto above_context = Optional<Array<PredictionMode, 4> const&>();
auto left_context = Optional<Array<PredictionMode, 4> const&>();
if (m_available_u)
above_context = m_sub_modes[get_image_index(m_mi_row - 1, m_mi_col)];
if (m_available_l)
left_context = m_sub_modes[get_image_index(m_mi_row, m_mi_col - 1)];
m_default_intra_mode = TRY_READ(TreeParser::parse_default_intra_mode(*m_bit_stream, *m_probability_tables, m_mi_size, above_context, left_context, m_block_sub_modes, idx, idy));
for (auto y = 0; y < m_num_4x4_h; y++) {
for (auto x = 0; x < m_num_4x4_w; x++) {
auto index = (idy + y) * 2 + idx + x;