mirror of
https://github.com/RGBCube/serenity
synced 2025-07-27 08:57:47 +00:00
LibVideo: Implement block parsing for inter frames
This gets the decoder closer to fully parsing the second frame without any errors. It will still be unable to output an inter-predicted frame. The lack of output causes VideoPlayer to crash if it attempts to read the buffers for frame 1, so it is still limited to the first frame.
This commit is contained in:
Zaggy1024
Andrew Kaster
parent
6c648329c4
commit
03738aa006
5 changed files with 435 additions and 96 deletions
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@ -28,22 +28,6 @@ Parser::~Parser()
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{
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}
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void Parser::cleanup_tile_allocations()
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{
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// FIXME: Is this necessary? Data should be truncated and
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// overwritten by the next tile.
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m_skips.clear_with_capacity();
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m_tx_sizes.clear_with_capacity();
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m_mi_sizes.clear_with_capacity();
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m_y_modes.clear_with_capacity();
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m_segment_ids.clear_with_capacity();
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m_ref_frames.clear_with_capacity();
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m_interp_filters.clear_with_capacity();
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m_mvs.clear_with_capacity();
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m_sub_mvs.clear_with_capacity();
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m_sub_modes.clear_with_capacity();
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}
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/* (6.1) */
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DecoderErrorOr<void> Parser::parse_frame(ByteBuffer const& frame_data)
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{
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@ -124,8 +108,8 @@ DecoderErrorOr<void> Parser::uncompressed_header()
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m_profile = (profile_high_bit << 1u) + profile_low_bit;
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if (m_profile == 3 && TRY_READ(m_bit_stream->read_bit()))
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return DecoderError::corrupted("uncompressed_header: Profile 3 reserved bit was non-zero"sv);
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auto show_existing_frame = TRY_READ(m_bit_stream->read_bit());
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if (show_existing_frame) {
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m_show_existing_frame = TRY_READ(m_bit_stream->read_bit());
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if (m_show_existing_frame) {
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m_frame_to_show_map_index = TRY_READ(m_bit_stream->read_bits(3));
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m_header_size_in_bytes = 0;
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m_refresh_frame_flags = 0;
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@ -301,8 +285,35 @@ DecoderErrorOr<void> Parser::frame_size_with_refs()
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void Parser::compute_image_size()
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{
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m_mi_cols = (m_frame_width + 7u) >> 3u;
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m_mi_rows = (m_frame_height + 7u) >> 3u;
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auto new_cols = (m_frame_width + 7u) >> 3u;
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auto new_rows = (m_frame_height + 7u) >> 3u;
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// 7.2.6 Compute image size semantics
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// When compute_image_size is invoked, the following ordered steps occur:
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// 1. If this is the first time compute_image_size is invoked, or if either FrameWidth or FrameHeight have
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// changed in value compared to the previous time this function was invoked, then the segmentation map is
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// cleared to all zeros by setting SegmentId[ row ][ col ] equal to 0 for row = 0..MiRows-1 and col =
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// 0..MiCols-1.
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bool first_invoke = !m_mi_cols && !m_mi_rows;
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bool same_size = m_mi_cols != new_cols || m_mi_rows != new_rows;
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if (first_invoke || same_size) {
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// m_segment_ids will be resized from decode_tiles() later.
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m_segment_ids.clear_with_capacity();
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}
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// 2. The variable UsePrevFrameMvs is set equal to 1 if all of the following conditions are true:
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// a. This is not the first time compute_image_size is invoked.
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// b. Both FrameWidth and FrameHeight have the same value compared to the previous time this function
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// was invoked.
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// c. show_frame was equal to 1 the previous time this function was invoked.
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// d. error_resilient_mode is equal to 0.
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// e. FrameIsIntra is equal to 0.
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// Otherwise, UsePrevFrameMvs is set equal to 0.
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m_use_prev_frame_mvs = !first_invoke && same_size && m_prev_show_frame && !m_error_resilient_mode && !m_frame_is_intra;
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m_prev_show_frame = m_show_frame;
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m_mi_cols = new_cols;
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m_mi_rows = new_rows;
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m_sb64_cols = (m_mi_cols + 7u) >> 3u;
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m_sb64_rows = (m_mi_rows + 7u) >> 3u;
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}
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@ -752,6 +763,24 @@ void Parser::setup_compound_reference_mode()
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}
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}
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void Parser::cleanup_tile_allocations()
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{
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// FIXME: Is this necessary? Data should be truncated and
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// overwritten by the next tile.
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m_skips.clear_with_capacity();
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m_tx_sizes.clear_with_capacity();
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m_mi_sizes.clear_with_capacity();
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m_y_modes.clear_with_capacity();
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m_segment_ids.clear_with_capacity();
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m_ref_frames.clear_with_capacity();
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m_interp_filters.clear_with_capacity();
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m_mvs.clear_with_capacity();
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m_sub_mvs.clear_with_capacity();
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m_sub_modes.clear_with_capacity();
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m_prev_ref_frames.clear_with_capacity();
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m_prev_mvs.clear_with_capacity();
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}
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DecoderErrorOr<void> Parser::allocate_tile_data()
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{
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auto dimensions = m_mi_rows * m_mi_cols;
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@ -766,6 +795,8 @@ DecoderErrorOr<void> Parser::allocate_tile_data()
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DECODER_TRY_ALLOC(m_mvs.try_resize_and_keep_capacity(dimensions));
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DECODER_TRY_ALLOC(m_sub_mvs.try_resize_and_keep_capacity(dimensions));
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DECODER_TRY_ALLOC(m_sub_modes.try_resize_and_keep_capacity(dimensions));
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DECODER_TRY_ALLOC(m_prev_ref_frames.try_resize_and_keep_capacity(dimensions));
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DECODER_TRY_ALLOC(m_prev_mvs.try_resize_and_keep_capacity(dimensions));
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return {};
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}
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@ -796,13 +827,15 @@ DecoderErrorOr<void> Parser::decode_tiles()
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return {};
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}
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void Parser::clear_context(Vector<u8>& context, size_t size)
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template<typename T>
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void Parser::clear_context(Vector<T>& context, size_t size)
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{
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context.resize_and_keep_capacity(size);
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__builtin_memset(context.data(), 0, sizeof(u8) * size);
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__builtin_memset(context.data(), 0, sizeof(T) * size);
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}
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void Parser::clear_context(Vector<Vector<u8>>& context, size_t outer_size, size_t inner_size)
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template<typename T>
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void Parser::clear_context(Vector<Vector<T>>& context, size_t outer_size, size_t inner_size)
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{
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if (context.size() < outer_size)
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context.resize(outer_size);
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@ -812,7 +845,8 @@ void Parser::clear_context(Vector<Vector<u8>>& context, size_t outer_size, size_
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void Parser::clear_above_context()
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{
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clear_context(m_above_nonzero_context, 3, 2 * m_mi_cols);
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for (auto i = 0u; i < m_above_nonzero_context.size(); i++)
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clear_context(m_above_nonzero_context[i], 2 * m_mi_cols);
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clear_context(m_above_seg_pred_context, m_mi_cols);
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clear_context(m_above_partition_context, m_sb64_cols * 8);
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}
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@ -837,7 +871,8 @@ DecoderErrorOr<void> Parser::decode_tile()
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void Parser::clear_left_context()
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{
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clear_context(m_left_nonzero_context, 3, 2 * m_mi_rows);
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for (auto i = 0u; i < m_left_nonzero_context.size(); i++)
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clear_context(m_left_nonzero_context[i], 2 * m_mi_rows);
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clear_context(m_left_seg_pred_context, m_mi_rows);
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clear_context(m_left_partition_context, m_sb64_rows * 8);
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}
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@ -1110,8 +1145,8 @@ DecoderErrorOr<void> Parser::inter_block_mode_info()
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TRY(read_ref_frames());
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for (auto j = 0; j < 2; j++) {
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if (m_ref_frame[j] > IntraFrame) {
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TRY(find_mv_refs(m_ref_frame[j], -1));
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TRY(find_best_ref_mvs(j));
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find_mv_refs(m_ref_frame[j], -1);
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find_best_ref_mvs(j);
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}
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}
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auto is_compound = m_ref_frame[1] > IntraFrame;
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@ -1134,7 +1169,7 @@ DecoderErrorOr<void> Parser::inter_block_mode_info()
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m_y_mode = NearestMv + inter_mode;
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if (m_y_mode == NearestMv || m_y_mode == NearMv) {
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for (auto j = 0; j < 1 + is_compound; j++)
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TRY(append_sub8x8_mvs(idy * 2 + idx, j));
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append_sub8x8_mvs(idy * 2 + idx, j);
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}
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TRY(assign_mv(is_compound));
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for (auto y = 0; y < m_num_4x4_h; y++) {
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@ -1207,7 +1242,7 @@ DecoderErrorOr<void> Parser::assign_mv(bool is_compound)
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DecoderErrorOr<void> Parser::read_mv(u8 ref)
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{
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m_use_hp = m_allow_high_precision_mv && TRY(use_mv_hp(m_best_mv[ref]));
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m_use_hp = m_allow_high_precision_mv && use_mv_hp(m_best_mv[ref]);
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MotionVector diff_mv;
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auto mv_joint = TRY_READ(m_tree_parser->parse_tree<MvJoint>(SyntaxElementType::MVJoint));
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if (mv_joint == MvJointHzvnz || mv_joint == MvJointHnzvnz)
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@ -1218,25 +1253,26 @@ DecoderErrorOr<void> Parser::read_mv(u8 ref)
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return {};
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}
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DecoderErrorOr<i32> Parser::read_mv_component(u8)
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DecoderErrorOr<i32> Parser::read_mv_component(u8 component)
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{
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m_tree_parser->set_mv_component(component);
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auto mv_sign = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::MVSign));
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auto mv_class = TRY_READ(m_tree_parser->parse_tree<MvClass>(SyntaxElementType::MVClass));
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u32 mag;
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if (mv_class == MvClass0) {
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auto mv_class0_bit = TRY_READ(m_tree_parser->parse_tree<u32>(SyntaxElementType::MVClass0Bit));
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auto mv_class0_fr = TRY_READ(m_tree_parser->parse_tree<u32>(SyntaxElementType::MVClass0FR));
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auto mv_class0_hp = TRY_READ(m_tree_parser->parse_tree<u32>(SyntaxElementType::MVClass0HP));
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u32 mv_class0_bit = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::MVClass0Bit));
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u32 mv_class0_fr = TRY_READ(m_tree_parser->parse_mv_class0_fr(mv_class0_bit));
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u32 mv_class0_hp = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::MVClass0HP));
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mag = ((mv_class0_bit << 3) | (mv_class0_fr << 1) | mv_class0_hp) + 1;
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} else {
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auto d = 0;
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for (size_t i = 0; i < mv_class; i++) {
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auto mv_bit = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::MVBit));
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u32 d = 0;
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for (u8 i = 0; i < mv_class; i++) {
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u32 mv_bit = TRY_READ(m_tree_parser->parse_mv_bit(i));
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d |= mv_bit << i;
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}
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mag = CLASS0_SIZE << (mv_class + 2);
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auto mv_fr = TRY_READ(m_tree_parser->parse_tree<u32>(SyntaxElementType::MVFR));
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auto mv_hp = TRY_READ(m_tree_parser->parse_tree<u32>(SyntaxElementType::MVHP));
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u32 mv_fr = TRY_READ(m_tree_parser->parse_tree<u8>(SyntaxElementType::MVFR));
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u32 mv_hp = TRY_READ(m_tree_parser->parse_tree<bool>(SyntaxElementType::MVHP));
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mag += ((d << 3) | (mv_fr << 1) | mv_hp) + 1;
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}
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return (mv_sign ? -1 : 1) * static_cast<i32>(mag);
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@ -1411,28 +1447,216 @@ DecoderErrorOr<i32> Parser::read_coef(Token token)
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return coef;
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}
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DecoderErrorOr<void> Parser::find_mv_refs(ReferenceFrame, int)
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bool Parser::is_inside(i32 row, i32 column)
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{
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// TODO: Implement
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return DecoderError::not_implemented();
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if (row < 0)
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return false;
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if (column < 0)
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return false;
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u32 row_positive = row;
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u32 column_positive = column;
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return row_positive < m_mi_rows && column_positive >= m_mi_col_start && column_positive < m_mi_col_end;
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}
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DecoderErrorOr<void> Parser::find_best_ref_mvs(int)
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void Parser::add_mv_ref_list(u8 ref_list)
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{
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// TODO: Implement
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return DecoderError::not_implemented();
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if (m_ref_mv_count >= 2)
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return;
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if (m_ref_mv_count > 0 && m_candidate_mv[ref_list] == m_ref_list_mv[0])
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return;
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m_ref_list_mv[m_ref_mv_count] = m_candidate_mv[ref_list];
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m_ref_mv_count++;
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}
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DecoderErrorOr<void> Parser::append_sub8x8_mvs(u8, u8)
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void Parser::get_block_mv(u32 candidate_row, u32 candidate_column, u8 ref_list, bool use_prev)
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{
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// TODO: Implement
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return DecoderError::not_implemented();
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auto index = get_image_index(candidate_row, candidate_column);
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if (use_prev) {
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m_candidate_mv[ref_list] = m_prev_mvs[index][ref_list];
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m_candidate_frame[ref_list] = m_prev_ref_frames[index][ref_list];
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} else {
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m_candidate_mv[ref_list] = m_mvs[index][ref_list];
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m_candidate_frame[ref_list] = m_ref_frames[index][ref_list];
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}
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}
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DecoderErrorOr<bool> Parser::use_mv_hp(const MotionVector&)
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void Parser::if_same_ref_frame_add_mv(u32 candidate_row, u32 candidate_column, ReferenceFrame ref_frame, bool use_prev)
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{
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// TODO: Implement
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return DecoderError::not_implemented();
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for (auto ref_list = 0u; ref_list < 2; ref_list++) {
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get_block_mv(candidate_row, candidate_column, ref_list, use_prev);
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if (m_candidate_frame[ref_list] == ref_frame) {
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add_mv_ref_list(ref_list);
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return;
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}
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}
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}
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void Parser::scale_mv(u8 ref_list, ReferenceFrame ref_frame)
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{
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auto candidate_frame = m_candidate_frame[ref_list];
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if (m_ref_frame_sign_bias[candidate_frame] != m_ref_frame_sign_bias[ref_frame])
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m_candidate_mv[ref_list] *= -1;
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}
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void Parser::if_diff_ref_frame_add_mv(u32 candidate_row, u32 candidate_column, ReferenceFrame ref_frame, bool use_prev)
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{
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for (auto ref_list = 0u; ref_list < 2; ref_list++)
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get_block_mv(candidate_row, candidate_column, ref_list, use_prev);
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auto mvs_are_same = m_candidate_mv[0] == m_candidate_mv[1];
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if (m_candidate_frame[0] > ReferenceFrame::IntraFrame && m_candidate_frame[0] != ref_frame) {
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scale_mv(0, ref_frame);
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add_mv_ref_list(0);
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}
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if (m_candidate_frame[1] > ReferenceFrame::IntraFrame && m_candidate_frame[1] != ref_frame && !mvs_are_same) {
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scale_mv(1, ref_frame);
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add_mv_ref_list(1);
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}
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}
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MotionVector Parser::clamp_mv(MotionVector vector, i32 border)
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{
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i32 blocks_high = num_8x8_blocks_high_lookup[m_mi_size];
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// Casts must be done here to prevent subtraction underflow from wrapping the values.
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i32 mb_to_top_edge = -8 * (static_cast<i32>(m_mi_row) * MI_SIZE);
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i32 mb_to_bottom_edge = 8 * ((static_cast<i32>(m_mi_rows) - blocks_high - static_cast<i32>(m_mi_row)) * MI_SIZE);
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i32 blocks_wide = num_8x8_blocks_wide_lookup[m_mi_size];
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i32 mb_to_left_edge = -8 * (static_cast<i32>(m_mi_col) * MI_SIZE);
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i32 mb_to_right_edge = 8 * ((static_cast<i32>(m_mi_cols) - blocks_wide - static_cast<i32>(m_mi_col)) * MI_SIZE);
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return {
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clip_3(mb_to_top_edge - border, mb_to_bottom_edge + border, vector.row()),
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clip_3(mb_to_left_edge - border, mb_to_right_edge + border, vector.column())
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};
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}
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void Parser::clamp_mv_ref(u8 i)
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{
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MotionVector& vector = m_ref_list_mv[i];
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vector = clamp_mv(vector, MV_BORDER);
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}
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// 6.5.1 Find MV refs syntax
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void Parser::find_mv_refs(ReferenceFrame reference_frame, i32 block)
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{
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m_ref_mv_count = 0;
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bool different_ref_found = false;
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u8 context_counter = 0;
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m_ref_list_mv[0] = {};
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m_ref_list_mv[1] = {};
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MotionVector base_coordinates = MotionVector(m_mi_row, m_mi_col);
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for (auto i = 0u; i < 2; i++) {
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auto offset_vector = mv_ref_blocks[m_mi_size][i];
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auto candidate = base_coordinates + offset_vector;
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if (is_inside(candidate.row(), candidate.column())) {
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auto candidate_index = get_image_index(candidate.row(), candidate.column());
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auto index = get_image_index(candidate.row(), candidate.column());
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different_ref_found = true;
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context_counter += mode_2_counter[m_y_modes[index]];
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for (auto ref_list = 0u; ref_list < 2; ref_list++) {
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if (m_ref_frames[candidate_index][ref_list] == reference_frame) {
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// This section up until add_mv_ref_list() is defined in spec as get_sub_block_mv().
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constexpr u8 idx_n_column_to_subblock[4][2] = {
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{ 1, 2 },
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{ 1, 3 },
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{ 3, 2 },
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{ 3, 3 }
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};
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auto index = block >= 0 ? idx_n_column_to_subblock[block][offset_vector.column() == 0] : 3;
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m_candidate_mv[ref_list] = m_sub_mvs[candidate_index][ref_list][index];
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add_mv_ref_list(ref_list);
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break;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for (auto i = 2u; i < MVREF_NEIGHBOURS; i++) {
|
||||
MotionVector candidate = base_coordinates + mv_ref_blocks[m_mi_size][i];
|
||||
if (is_inside(candidate.row(), candidate.column())) {
|
||||
different_ref_found = true;
|
||||
if_same_ref_frame_add_mv(candidate.row(), candidate.column(), reference_frame, false);
|
||||
}
|
||||
}
|
||||
if (m_use_prev_frame_mvs)
|
||||
if_same_ref_frame_add_mv(m_mi_row, m_mi_col, reference_frame, true);
|
||||
|
||||
if (different_ref_found) {
|
||||
for (auto i = 0u; i < MVREF_NEIGHBOURS; i++) {
|
||||
MotionVector candidate = base_coordinates + mv_ref_blocks[m_mi_size][i];
|
||||
if (is_inside(candidate.row(), candidate.column()))
|
||||
if_diff_ref_frame_add_mv(candidate.row(), candidate.column(), reference_frame, false);
|
||||
}
|
||||
}
|
||||
if (m_use_prev_frame_mvs)
|
||||
if_diff_ref_frame_add_mv(m_mi_row, m_mi_col, reference_frame, true);
|
||||
|
||||
m_mode_context[reference_frame] = counter_to_context[context_counter];
|
||||
for (auto i = 0u; i < MAX_MV_REF_CANDIDATES; i++)
|
||||
clamp_mv_ref(i);
|
||||
}
|
||||
|
||||
bool Parser::use_mv_hp(MotionVector const& vector)
|
||||
{
|
||||
return (abs(vector.row()) >> 3) < COMPANDED_MVREF_THRESH && (abs(vector.column()) >> 3) < COMPANDED_MVREF_THRESH;
|
||||
}
|
||||
|
||||
void Parser::find_best_ref_mvs(u8 ref_list)
|
||||
{
|
||||
for (auto i = 0u; i < MAX_MV_REF_CANDIDATES; i++) {
|
||||
auto delta = m_ref_list_mv[i];
|
||||
auto delta_row = delta.row();
|
||||
auto delta_column = delta.column();
|
||||
if (!m_allow_high_precision_mv || !use_mv_hp(delta)) {
|
||||
if (delta_row & 1)
|
||||
delta_row += delta_row > 0 ? -1 : 1;
|
||||
if (delta_column & 1)
|
||||
delta_column += delta_column > 0 ? -1 : 1;
|
||||
}
|
||||
m_ref_list_mv[i] = clamp_mv(m_ref_list_mv[i], (BORDERINPIXELS - INTERP_EXTEND) << 3);
|
||||
}
|
||||
|
||||
m_nearest_mv[ref_list] = m_ref_list_mv[0];
|
||||
m_near_mv[ref_list] = m_ref_list_mv[1];
|
||||
m_best_mv[ref_list] = m_ref_list_mv[0];
|
||||
}
|
||||
|
||||
void Parser::append_sub8x8_mvs(i32 block, u8 ref_list)
|
||||
{
|
||||
MotionVector sub_8x8_mvs[2];
|
||||
find_mv_refs(m_ref_frame[ref_list], block);
|
||||
auto destination_index = 0;
|
||||
if (block == 0) {
|
||||
for (auto i = 0u; i < 2; i++)
|
||||
sub_8x8_mvs[destination_index++] = m_ref_list_mv[i];
|
||||
} else if (block <= 2) {
|
||||
sub_8x8_mvs[destination_index++] = m_block_mvs[ref_list][0];
|
||||
} else {
|
||||
sub_8x8_mvs[destination_index++] = m_block_mvs[ref_list][2];
|
||||
for (auto index = 1; index >= 0 && destination_index < 2; index--) {
|
||||
auto block_vector = m_block_mvs[ref_list][index];
|
||||
if (block_vector != sub_8x8_mvs[0])
|
||||
sub_8x8_mvs[destination_index++] = block_vector;
|
||||
}
|
||||
}
|
||||
|
||||
for (auto n = 0u; n < 2 && destination_index < 2; n++) {
|
||||
auto ref_list_vector = m_ref_list_mv[n];
|
||||
if (ref_list_vector != sub_8x8_mvs[0])
|
||||
sub_8x8_mvs[destination_index++] = ref_list_vector;
|
||||
}
|
||||
|
||||
if (destination_index < 2)
|
||||
sub_8x8_mvs[destination_index++] = {};
|
||||
m_nearest_mv[ref_list] = sub_8x8_mvs[0];
|
||||
m_near_mv[ref_list] = sub_8x8_mvs[1];
|
||||
}
|
||||
|
||||
void Parser::dump_info()
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue