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LibVideo/VP9: Use a struct for block context to keep between frames

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There are three fields that we need to store from FrameBlockContext to
keep between frames, which are used to parse for those same fields for
the next frame.
This commit is contained in:
Zaggy1024 2022-11-20 12:42:17 -06:00 • committed by Andreas Kling
parent 5275a1101e
commit 4a4aa697d9
4 changed files with 75 additions and 28 deletions
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34
Userland/Libraries/LibVideo/VP9/Decoder.cpp
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@ -66,14 +66,7 @@ DecoderErrorOr<void> Decoder::decode_frame(ReadonlyBytes frame_data)
// − show_existing_frame is equal to 0,
// − segmentation_enabled is equal to 1,
// − segmentation_update_map is equal to 1.
if (!m_parser->m_show_existing_frame && m_parser->m_segmentation_enabled && m_parser->m_segmentation_update_map) {
for (auto row = 0u; row < m_parser->m_mi_rows; row++) {
for (auto column = 0u; column < m_parser->m_mi_cols; column++) {
auto index = index_from_row_and_column(row, column, m_parser->m_mi_rows);
m_parser->m_prev_segment_ids[index] = m_parser->m_frame_block_contexts[index].segment_id;
}
}
}
// This is handled by update_reference_frames.
// 4. The output process as specified in section 8.9 is invoked.
if (m_parser->m_show_frame)
@ -1808,21 +1801,24 @@ DecoderErrorOr<void> Decoder::update_reference_frames()
// 2. If show_existing_frame is equal to 0, the following applies:
if (!m_parser->m_show_existing_frame) {
DECODER_TRY_ALLOC(m_parser->m_previous_block_contexts.try_resize_to_match_other_vector2d(m_parser->m_frame_block_contexts));
// − PrevRefFrames[ row ][ col ][ list ] is set equal to RefFrames[ row ][ col ][ list ] for row = 0..MiRows-1,
// for col = 0..MiCols-1, for list = 0..1.
// − PrevMvs[ row ][ col ][ list ][ comp ] is set equal to Mvs[ row ][ col ][ list ][ comp ] for row = 0..MiRows-1,
// for col = 0..MiCols-1, for list = 0..1, for comp = 0..1.
size_t size = m_parser->m_frame_block_contexts.width() * m_parser->m_frame_block_contexts.height();
m_parser->m_prev_ref_frames.resize_and_keep_capacity(size);
m_parser->m_prev_mvs.resize_and_keep_capacity(size);
for (u32 row = 0; row < m_parser->m_frame_block_contexts.height(); row++) {
for (u32 column = 0; column < m_parser->m_frame_block_contexts.width(); column++) {
auto index = m_parser->m_frame_block_contexts.index_at(row, column);
auto context = m_parser->m_frame_block_contexts[index];
m_parser->m_prev_ref_frames[index] = context.ref_frames;
m_parser->m_prev_mvs[index] = context.primary_motion_vector_pair();
}
}
// And from decode_frame():
// - If all of the following conditions are true, PrevSegmentIds[ row ][ col ] is set equal to
// SegmentIds[ row ][ col ] for row = 0..MiRows-1, for col = 0..MiCols-1:
// − show_existing_frame is equal to 0,
// − segmentation_enabled is equal to 1,
// − segmentation_update_map is equal to 1.
bool keep_segment_ids = !m_parser->m_show_existing_frame && m_parser->m_segmentation_enabled && m_parser->m_segmentation_update_map;
m_parser->m_frame_block_contexts.copy_to(m_parser->m_previous_block_contexts, [keep_segment_ids](FrameBlockContext context) {
auto persistent_context = PersistentBlockContext(context);
if (!keep_segment_ids)
persistent_context.segment_id = 0;
return persistent_context;
});
}
return {};