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LibVideo/VP9: Implement parsing Token and MoreCoefs trees

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These elements were being used in the new tokens implementation, so
support for them in the TreeParser has been added.

Additionally, this uncovered a bug where the nonzero contexts were
being cleared with the wrong size.
This commit is contained in:
FalseHonesty 2021-06-27 11:49:46 -04:00 • committed by Andreas Kling
parent aa27ca1b16
commit 074fbd1b06
3 changed files with 86 additions and 10 deletions
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8
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -752,7 +752,7 @@ void Parser::clear_context(Vector<Vector<u8>>& context, size_t outer_size, size_
bool Parser::clear_above_context()
{
clear_context(m_above_nonzero_context, 2 * m_mi_cols, 3);
clear_context(m_above_nonzero_context, 3, 2 * m_mi_cols);
clear_context(m_above_seg_pred_context, m_mi_cols);
clear_context(m_above_partition_context, m_sb64_cols * 8);
return true;
@ -780,7 +780,7 @@ bool Parser::decode_tile()
bool Parser::clear_left_context()
{
clear_context(m_left_nonzero_context, 2 * m_mi_rows, 3);
clear_context(m_left_nonzero_context, 3, 2 * m_mi_rows);
clear_context(m_left_seg_pred_context, m_mi_rows);
clear_context(m_left_partition_context, m_sb64_rows * 8);
return true;
@ -1193,7 +1193,7 @@ BlockSubsize Parser::get_plane_block_size(u32 subsize, u8 plane)
bool Parser::tokens(size_t plane, u32 start_x, u32 start_y, TXSize tx_size, u32 block_index)
{
m_tree_parser->set_more_coefs_variables(start_x, start_y);
m_tree_parser->set_start_x_and_y(start_x, start_y);
size_t segment_eob = 16 << (tx_size << 1);
auto scan = get_scan(plane, tx_size, block_index);
auto check_eob = true;
@ -1201,7 +1201,7 @@ bool Parser::tokens(size_t plane, u32 start_x, u32 start_y, TXSize tx_size, u32
for (; c < segment_eob; c++) {
auto pos = scan[c];
auto band = (tx_size == TX_4x4) ? coefband_4x4[c] : coefband_8x8plus[c];
m_tree_parser->set_band(band);
m_tree_parser->set_tokens_variables(band, c, plane, tx_size, pos);
if (check_eob) {
auto more_coefs = m_tree_parser->parse_tree<bool>(SyntaxElementType::MoreCoefs);
if (!more_coefs)