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LibVideo/VP9: Move segmentation id prediction context to TileContext

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These can also be stored in the same places as the non-zero tokens
contexts.
This commit is contained in:
Zaggy1024 2022-11-28 04:56:04 -06:00 • committed by Andreas Kling
parent 9df72080a1
commit 1fe22f2141
5 changed files with 31 additions and 19 deletions
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29
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -851,6 +851,7 @@ DecoderErrorOr<void> Parser::decode_tiles(FrameContext& frame_context)
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));
SegmentationPredictionContext above_segmentation_ids = DECODER_TRY_ALLOC(SegmentationPredictionContext::try_create(frame_context.columns()));
// FIXME: To implement tiled decoding, we'll need to pre-parse the tile positions and sizes into a 2D vector of ReadonlyBytes,
// then run through each column of tiles in top to bottom order afterward. Each column can be sent to a worker thread
@ -871,8 +872,9 @@ DecoderErrorOr<void> Parser::decode_tiles(FrameContext& frame_context)
auto columns_end = get_tile_offset(tile_col + 1, frame_context.columns(), log2_dimensions.width());
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 above_segmentation_ids_for_tile = safe_slice(above_segmentation_ids.span(), columns_start, columns_end - columns_start);
auto tile_context = DECODER_TRY_ALLOC(TileContext::try_create(frame_context, rows_start, rows_end, columns_start, columns_end, above_non_zero_tokens_view));
auto tile_context = DECODER_TRY_ALLOC(TileContext::try_create(frame_context, rows_start, rows_end, columns_start, columns_end, above_non_zero_tokens_view, above_segmentation_ids_for_tile));
TRY_READ(m_bit_stream->init_bool(tile_size));
TRY(decode_tile(tile_context));
@ -900,7 +902,6 @@ void Parser::clear_context(Vector<Vector<T>>& context, size_t outer_size, size_t
void Parser::clear_above_context(FrameContext& frame_context)
{
clear_context(m_above_seg_pred_context, frame_context.columns());
clear_context(m_above_partition_context, frame_context.superblock_columns() * 8);
}
@ -926,7 +927,7 @@ void Parser::clear_left_context(TileContext& tile_context)
{
for (auto& context_for_plane : tile_context.left_non_zero_tokens)
context_for_plane.fill_with(false);
clear_context(m_left_seg_pred_context, tile_context.frame_context.rows());
tile_context.left_segmentation_ids.fill_with(0);
clear_context(m_left_partition_context, tile_context.frame_context.superblock_rows() * 8);
}
@ -1095,24 +1096,20 @@ DecoderErrorOr<void> Parser::set_inter_segment_id(BlockContext& block_context)
return {};
}
auto seg_id_predicted = TRY_READ(TreeParser::parse_segment_id_predicted(*m_bit_stream, block_context.frame_context.predicted_segment_id_tree_probabilities, m_left_seg_pred_context[block_context.row], m_above_seg_pred_context[block_context.column]));
auto above_segmentation_id = block_context.tile_context.above_segmentation_ids[block_context.row - block_context.tile_context.rows_start];
auto left_segmentation_id = block_context.tile_context.left_segmentation_ids[block_context.column - block_context.tile_context.columns_start];
auto seg_id_predicted = TRY_READ(TreeParser::parse_segment_id_predicted(*m_bit_stream, block_context.frame_context.predicted_segment_id_tree_probabilities, above_segmentation_id, left_segmentation_id));
if (seg_id_predicted)
block_context.segment_id = predicted_segment_id;
else
block_context.segment_id = TRY_READ(TreeParser::parse_segment_id(*m_bit_stream, block_context.frame_context.full_segment_id_tree_probabilities));
for (size_t i = 0; i < num_8x8_blocks_wide_lookup[block_context.size]; i++) {
auto index = block_context.column + i;
// (7.4.1) AboveSegPredContext[ i ] only needs to be set to 0 for i = 0..MiCols-1.
if (index < m_above_seg_pred_context.size())
m_above_seg_pred_context[index] = seg_id_predicted;
}
for (size_t i = 0; i < num_8x8_blocks_high_lookup[block_context.size]; i++) {
auto index = block_context.row + i;
// (7.4.1) LeftSegPredContext[ i ] only needs to be set to 0 for i = 0..MiRows-1.
if (index < m_above_seg_pred_context.size())
m_left_seg_pred_context[block_context.row + i] = seg_id_predicted;
}
// (7.4.1) AboveSegPredContext[ i ] only needs to be set to 0 for i = 0..MiCols-1.
// This is taken care of by the slicing in BlockContext.
block_context.above_segmentation_ids.fill(seg_id_predicted);
// (7.4.1) LeftSegPredContext[ i ] only needs to be set to 0 for i = 0..MiRows-1.
// This is taken care of by the slicing in BlockContext.
block_context.left_segmentation_ids.fill(seg_id_predicted);
return {};
}