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LibVideo: Implement inter prediction

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This enables the second frame of the test video to be decoded.

It appears that the test video uses a superframe (group of multiple
frames) for the first chunk of the file, but we haven't implemented
superframe parsing.

We also ignore the show_frame flag, so for now, this
means that the second frame read out is shown when it should not be. To
fix this, another error type needs to be implemented that is "thrown" to
decoder's client so they know to send another sample buffer.
This commit is contained in:
Zaggy1024 2022-09-21 20:16:40 -05:00 • committed by Andrew Kaster
parent 50d4217dbc
commit b0187dfc27
6 changed files with 487 additions and 51 deletions
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43
Userland/Libraries/LibVideo/VP9/Parser.cpp
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@ -295,8 +295,8 @@ void Parser::compute_image_size()
// cleared to all zeros by setting SegmentId[ row ][ col ] equal to 0 for row = 0..MiRows-1 and col =
// 0..MiCols-1.
bool first_invoke = !m_mi_cols && !m_mi_rows;
bool same_size = m_mi_cols != new_cols || m_mi_rows != new_rows;
if (first_invoke || same_size) {
bool same_size = m_mi_cols == new_cols && m_mi_rows == new_rows;
if (first_invoke || !same_size) {
// m_segment_ids will be resized from decode_tiles() later.
m_segment_ids.clear_with_capacity();
}
@ -777,8 +777,6 @@ void Parser::cleanup_tile_allocations()
m_mvs.clear_with_capacity();
m_sub_mvs.clear_with_capacity();
m_sub_modes.clear_with_capacity();
m_prev_ref_frames.clear_with_capacity();
m_prev_mvs.clear_with_capacity();
}
DecoderErrorOr<void> Parser::allocate_tile_data()
@ -795,8 +793,6 @@ DecoderErrorOr<void> Parser::allocate_tile_data()
DECODER_TRY_ALLOC(m_mvs.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_sub_mvs.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_sub_modes.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_prev_ref_frames.try_resize_and_keep_capacity(dimensions));
DECODER_TRY_ALLOC(m_prev_mvs.try_resize_and_keep_capacity(dimensions));
return {};
}
@ -1082,10 +1078,19 @@ DecoderErrorOr<void> Parser::inter_segment_id()
m_segment_id = predicted_segment_id;
else
m_segment_id = TRY_READ(m_tree_parser->parse_tree<u8>(SyntaxElementType::SegmentID));
for (size_t i = 0; i < num_8x8_blocks_wide_lookup[m_mi_size]; i++)
m_above_seg_pred_context[m_mi_col + i] = seg_id_predicted;
for (size_t i = 0; i < num_8x8_blocks_high_lookup[m_mi_size]; i++)
m_left_seg_pred_context[m_mi_row + i] = seg_id_predicted;
for (size_t i = 0; i < num_8x8_blocks_wide_lookup[m_mi_size]; i++) {
auto index = m_mi_col + 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[m_mi_size]; i++) {
auto index = m_mi_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[m_mi_row + i] = seg_id_predicted;
}
return {};
}
@ -1331,12 +1336,19 @@ DecoderErrorOr<void> Parser::residual()
TRY(m_decoder.reconstruct(plane, start_x, start_y, tx_size));
}
}
auto& above_sub_context = m_above_nonzero_context[plane];
auto above_sub_context_index = start_x >> 2;
auto above_sub_context_end = min(above_sub_context_index + step, above_sub_context.size());
for (; above_sub_context_index < above_sub_context_end; above_sub_context_index++)
above_sub_context[above_sub_context_index] = non_zero;
auto& left_sub_context = m_left_nonzero_context[plane];
for (auto i = 0; i < step; i++) {
above_sub_context[(start_x >> 2) + i] = non_zero;
left_sub_context[(start_y >> 2) + i] = non_zero;
}
auto left_sub_context_index = start_y >> 2;
auto left_sub_context_end = min(left_sub_context_index + step, left_sub_context.size());
for (; left_sub_context_index < left_sub_context_end; left_sub_context_index++)
left_sub_context[left_sub_context_index] = non_zero;
block_index++;
}
}
@ -1620,7 +1632,8 @@ void Parser::find_best_ref_mvs(u8 ref_list)
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);
delta = { delta_row, delta_column };
m_ref_list_mv[i] = clamp_mv(delta, (BORDERINPIXELS - INTERP_EXTEND) << 3);
}
m_nearest_mv[ref_list] = m_ref_list_mv[0];