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LibVideo/VP9: Refactor how TreeParser accesses decoder data

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The TreeParser requires information about a lot of the decoder's
current state in order to parse syntax tree elements correctly, so
there has to be some communication between the Decoder and the
TreeParser. Previously, the Decoder would copy its state to the
TreeParser when it changed, however, this was a poor choice. Now,
the TreeParser simply has a reference to its owning Decoder, and
accesses its state directly.
This commit is contained in:
FalseHonesty 2021-01-31 00:42:36 -05:00 • committed by Andreas Kling
parent 375dbad144
commit 741677b992
4 changed files with 47 additions and 88 deletions
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34
Userland/Libraries/LibVideo/VP9/Decoder.cpp
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@ -14,17 +14,14 @@ namespace Video::VP9 {
Decoder::Decoder()
: m_probability_tables(make<ProbabilityTables>())
, m_tree_parser(make<TreeParser>(*m_probability_tables))
, m_tree_parser(make<TreeParser>(*this))
{
m_tree_parser->set_segmentation_tree_probs(m_segmentation_tree_probs);
}
bool Decoder::parse_frame(const ByteBuffer& frame_data)
{
m_bit_stream = make<BitStream>(frame_data.data(), frame_data.size());
m_syntax_element_counter = make<SyntaxElementCounter>();
m_tree_parser->set_bit_stream(m_bit_stream);
m_tree_parser->set_syntax_element_counter(m_syntax_element_counter);
if (!uncompressed_header())
return false;
@ -130,8 +127,6 @@ bool Decoder::uncompressed_header()
}
}
m_tree_parser->set_frame_is_intra(m_frame_is_intra);
if (!m_error_resilient_mode) {
m_refresh_frame_context = m_bit_stream->read_bit();
m_frame_parallel_decoding_mode = m_bit_stream->read_bit();
@ -522,9 +517,8 @@ u8 Decoder::inv_recenter_nonneg(u8 v, u8 m)
bool Decoder::read_coef_probs()
{
auto max_tx_size = tx_mode_to_biggest_tx_size[m_tx_mode];
m_tree_parser->set_max_tx_size(max_tx_size);
for (auto tx_size = TX_4x4; tx_size <= max_tx_size; tx_size = static_cast<TXSize>(static_cast<int>(tx_size) + 1)) {
m_max_tx_size = tx_mode_to_biggest_tx_size[m_tx_mode];
for (auto tx_size = TX_4x4; tx_size <= m_max_tx_size; tx_size = static_cast<TXSize>(static_cast<int>(tx_size) + 1)) {
auto update_probs = m_bit_stream->read_literal(1);
if (update_probs == 1) {
for (auto i = 0; i < 2; i++) {
@ -774,9 +768,9 @@ bool Decoder::decode_tile()
for (auto row = m_mi_row_start; row < m_mi_row_end; row += 8) {
if (!clear_left_context())
return false;
m_tree_parser->set_row(row);
m_row = row;
for (auto col = m_mi_col_start; col < m_mi_col_end; col += 8) {
m_tree_parser->set_col(col);
m_col = col;
if (!decode_partition(row, col, Block_64x64))
return false;
}
@ -796,15 +790,11 @@ bool Decoder::decode_partition(u32 row, u32 col, u8 block_subsize)
{
if (row >= m_mi_rows || col >= m_mi_cols)
return false;
auto num_8x8 = num_8x8_blocks_wide_lookup[block_subsize];
auto half_block_8x8 = num_8x8 >> 1;
auto has_rows = (row + half_block_8x8) < m_mi_rows;
auto has_cols = (col + half_block_8x8) < m_mi_cols;
m_tree_parser->set_has_rows(has_rows);
m_tree_parser->set_has_cols(has_cols);
m_tree_parser->set_block_subsize(block_subsize);
m_tree_parser->set_num_8x8(num_8x8);
m_block_subsize = block_subsize;
m_num_8x8 = num_8x8_blocks_wide_lookup[block_subsize];
auto half_block_8x8 = m_num_8x8 >> 1;
m_has_rows = (row + half_block_8x8) < m_mi_rows;
m_has_cols = (col + half_block_8x8) < m_mi_cols;
auto partition = m_tree_parser->parse_tree(SyntaxElementType::Partition);
dbgln("Parsed partition value {}", partition);
@ -827,14 +817,10 @@ bool Decoder::decode_partition(u32 row, u32 col, u8 block_subsize)
bool Decoder::decode_block(u32 row, u32 col, u8 subsize)
{
m_mi_row = row;
m_tree_parser->set_mi_row(m_mi_row);
m_mi_col = col;
m_tree_parser->set_mi_col(m_mi_col);
m_mi_size = subsize;
m_available_u = row > 0;
m_tree_parser->set_available_u(m_available_u);
m_available_l = col > m_mi_col_start;
m_tree_parser->set_available_l(m_available_l);
if (!mode_info())
return false;
// FIXME: Finish implementing