[FFmpeg-cvslog] lavc/vvc: Don't check motion estimation region for IBC

[Frank Plowman]

ffmpeg | branch: master | Frank Plowman <post at frankplowman.com> | Thu Nov 28 22:17:24 2024 +0000| [7399d9f374db17942fad40839b7c366236c63014] | committer: Nuo Mi

lavc/vvc: Don't check motion estimation region for IBC

The final parameter of check_available determines whether the motion
estimation region constraints imposed in section 8.5.2.3 of H.266 (V3)
on MVP candidates apply to the current candidate or not.  In the case of
IBC spatial merge candidates they do not, as their availability is
dependent only on the criteria described in sections 8.6.2.3 and 6.4.4,
which do not include this constraint on the motion estimation region.

Signed-off-by: Frank Plowman <post at frankplowman.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7399d9f374db17942fad40839b7c366236c63014
---

 libavcodec/vvc/mvs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libavcodec/vvc/mvs.c b/libavcodec/vvc/mvs.c
index 86ad310035..566df158a8 100644
--- a/libavcodec/vvc/mvs.c
+++ b/libavcodec/vvc/mvs.c
@@ -1627,12 +1627,12 @@ static int ibc_spatial_candidates(const VVCLocalContext *lc, const int merge_idx
 
     init_neighbour_context(&nctx, lc);
 
-    if (check_available(a1, lc, 1)) {
+    if (check_available(a1, lc, 0)) {
         cand_list[num_cands++] = TAB_MVF(a1->x, a1->y).mv[L0];
         if (num_cands > merge_idx)
             return 1;
     }
-    if (check_available(b1, lc, 1)) {
+    if (check_available(b1, lc, 0)) {
         const MvField *mvf = &TAB_MVF(b1->x, b1->y);
         if (!num_cands || !IS_SAME_MV(&cand_list[0], mvf->mv)) {
             cand_list[num_cands++] = mvf->mv[L0];