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LibVideo/VP9: Implement more TreeParser probability calculations

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Now TreeParser has mostly complete probability calculation
implementations for all currently used syntax elements. Some of these
calculation methods aren't actually finished because they use data
we have yet to parse in the Decoder, but they're close to finished.
This commit is contained in:
FalseHonesty 2021-06-21 12:22:00 -04:00 • committed by Andreas Kling
parent f85f557a1f
commit e4f015ce3d
4 changed files with 407 additions and 23 deletions
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9
Userland/Libraries/LibVideo/VP9/Decoder.cpp
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@ -829,19 +829,20 @@ bool Decoder::intra_frame_mode_info()
m_default_intra_mode = m_tree_parser->parse_tree<IntraMode>(SyntaxElementType::DefaultIntraMode);
m_y_mode = m_default_intra_mode;
for (auto b = 0; b < 4; b++)
m_sub_modes[b] = m_y_mode;
m_block_sub_modes[b] = m_y_mode;
} else {
m_num_4x4_w = num_4x4_blocks_wide_lookup[m_mi_size];
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 = m_tree_parser->parse_tree<IntraMode>(SyntaxElementType::DefaultIntraMode);
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;
if (index > 3)
dbgln("Trying to access index {} on m_sub_modes", index);
m_sub_modes[index] = m_default_intra_mode;
m_block_sub_modes[index] = m_default_intra_mode;
}
}
}
@ -969,7 +970,7 @@ bool Decoder::intra_block_mode_info()
if (m_mi_size >= Block_8x8) {
m_y_mode = m_tree_parser->parse_tree<u8>(SyntaxElementType::IntraMode);
for (auto b = 0; b < 4; b++)
m_sub_modes[b] = m_y_mode;
m_block_sub_modes[b] = m_y_mode;
} else {
m_num_4x4_w = num_4x4_blocks_wide_lookup[m_mi_size];
m_num_4x4_h = num_4x4_blocks_high_lookup[m_mi_size];
@ -979,7 +980,7 @@ bool Decoder::intra_block_mode_info()
sub_intra_mode = m_tree_parser->parse_tree<u8>(SyntaxElementType::SubIntraMode);
for (auto y = 0; y < m_num_4x4_h; y++) {
for (auto x = 0; x < m_num_4x4_w; x++) {
m_sub_modes[(idy + y) * 2 + idx + x] = sub_intra_mode;
m_block_sub_modes[(idy + y) * 2 + idx + x] = sub_intra_mode;
}
}
}