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lavc/vvc: Fix check whether QG is in first tile col

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The second part of this condition is intended to check whether the
current quantisation group is in the first CTU column of the current
tile.  The issue is that ctb_to_col_bd gives the x-ordinate of the first
column of the current tile *in CTUs*, while xQg gives the x-ordinate of
the quantisation group *in samples*.  Rectify this by shifting xQg by
ctb_log2_size to get xQg in CTUs before comparing.

Fixes FFVVC issues #201 and #203.
This commit is contained in:
Frank Plowman 2024-03-19 19:47:51 +00:00 committed by Nuo Mi
parent 0b7d4fccce
commit dfcf5f828d
1 changed files with 1 additions and 1 deletions
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libavcodec/vvc/vvc_ctu.c
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@ -96,7 +96,7 @@ static int get_qp_y_pred(const VVCLocalContext *lc)
if (lc->na.cand_up) {
const int first_qg_in_ctu = !(xQg & ctb_size_mask) && !(yQg & ctb_size_mask);
const int qPy_up = fc->tab.qp[LUMA][x_cb + (y_cb - 1) * min_cb_width];
if (first_qg_in_ctu && pps->ctb_to_col_bd[xQg >> ctb_log2_size] == xQg)
if (first_qg_in_ctu && pps->ctb_to_col_bd[xQg >> ctb_log2_size] == xQg >> ctb_log2_size)
return qPy_up;
}