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LibVideo/VP9: Move the above non-zero tokens context into decode_tiles

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We can store this context in the stack of Parser::decode_tiles and use
spans to give access to the sections of the context for each tile and
subsequently each block.
This commit is contained in:
Zaggy1024 2022-11-28 01:01:11 -06:00 • committed by Andreas Kling
parent 4e7e9d8479
commit 2f043a0bd4
5 changed files with 27 additions and 20 deletions
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19
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -848,7 +848,9 @@ DecoderErrorOr<void> Parser::decode_tiles(FrameContext& frame_context)
auto log2_dimensions = frame_context.log2_of_tile_counts;
auto tile_cols = 1 << log2_dimensions.width();
auto tile_rows = 1 << log2_dimensions.height();
clear_above_context(frame_context);
NonZeroTokens above_non_zero_tokens = DECODER_TRY_ALLOC(create_non_zero_tokens(blocks_to_sub_blocks(frame_context.columns()), frame_context.color_config.subsampling_x));
for (auto tile_row = 0; tile_row < tile_rows; tile_row++) {
for (auto tile_col = 0; tile_col < tile_cols; tile_col++) {
@ -864,7 +866,9 @@ DecoderErrorOr<void> Parser::decode_tiles(FrameContext& frame_context)
auto columns_start = get_tile_offset(tile_col, frame_context.columns(), log2_dimensions.width());
auto columns_end = get_tile_offset(tile_col + 1, frame_context.columns(), log2_dimensions.width());
auto tile_context = DECODER_TRY_ALLOC(TileContext::try_create(frame_context, rows_start, rows_end, columns_start, columns_end));
auto above_non_zero_tokens_view = create_non_zero_tokens_view(above_non_zero_tokens, blocks_to_sub_blocks(columns_start), blocks_to_sub_blocks(columns_end - columns_start), frame_context.color_config.subsampling_x);
auto tile_context = DECODER_TRY_ALLOC(TileContext::try_create(frame_context, rows_start, rows_end, columns_start, columns_end, above_non_zero_tokens_view));
TRY_READ(m_bit_stream->init_bool(tile_size));
TRY(decode_tile(tile_context));
@ -892,8 +896,6 @@ void Parser::clear_context(Vector<Vector<T>>& context, size_t outer_size, size_t
void Parser::clear_above_context(FrameContext& frame_context)
{
for (auto i = 0u; i < m_above_nonzero_context.size(); i++)
clear_context(m_above_nonzero_context[i], 2 * frame_context.columns());
clear_context(m_above_seg_pred_context, frame_context.columns());
clear_context(m_above_partition_context, frame_context.superblock_columns() * 8);
}
@ -1397,11 +1399,10 @@ DecoderErrorOr<bool> Parser::residual(BlockContext& block_context, bool has_bloc
}
}
auto& above_sub_block_context = m_above_nonzero_context[plane];
auto above_sub_block_context_index = pixels_to_sub_blocks(transform_x_in_px);
auto above_sub_block_context_end = min(above_sub_block_context_index + transform_size_in_sub_blocks, above_sub_block_context.size());
for (; above_sub_block_context_index < above_sub_block_context_end; above_sub_block_context_index++)
above_sub_block_context[above_sub_block_context_index] = sub_block_had_non_zero_tokens;
auto& above_sub_block_tokens = block_context.above_non_zero_tokens[plane];
auto transform_right_in_sub_blocks = min(x + transform_size_in_sub_blocks, above_sub_block_tokens.size());
for (size_t inside_x = x; inside_x < transform_right_in_sub_blocks; inside_x++)
above_sub_block_tokens[inside_x] = sub_block_had_non_zero_tokens;
auto& left_sub_block_context = block_context.left_non_zero_tokens[plane];
auto transform_bottom_in_sub_blocks = min(y + transform_size_in_sub_blocks, left_sub_block_context.size());
@ -1458,7 +1459,7 @@ DecoderErrorOr<bool> Parser::tokens(BlockContext& block_context, size_t plane, u
auto token_position = scan[coef_index];
TokensContext tokens_context;
if (coef_index == 0)
tokens_context = TreeParser::get_context_for_first_token(block_context, m_above_nonzero_context, block_context.left_non_zero_tokens, transform_size, plane, sub_block_column, sub_block_row, block_context.is_inter_predicted(), band);
tokens_context = TreeParser::get_context_for_first_token(block_context.above_non_zero_tokens, block_context.left_non_zero_tokens, transform_size, plane, sub_block_column, sub_block_row, block_context.is_inter_predicted(), band);
else
tokens_context = TreeParser::get_context_for_other_tokens(token_cache, transform_size, transform_set, plane, token_position, block_context.is_inter_predicted(), band);