When a stream has ALF filtering enabled but not CC-ALF, the CC-ALF set indexes
alf->ctb_cc_idc are being read uninitialized during ALF filtering.
This change initializes alf->ctb_cc_idc whenever ALF is enabled.
Ref. https://trac.ffmpeg.org/ticket/11325
---
libavcodec/vvc/ctu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/vvc/ctu.c b/libavcodec/vvc/ctu.c
index a32abdeb62..c972dcc33e 100644
--- a/libavcodec/vvc/ctu.c
+++ b/libavcodec/vvc/ctu.c
@@ -2288,6 +2288,7 @@ static void alf_params(VVCLocalContext *lc, const int rx,
const int ry)
ALFParams *alf= &CTB(fc->tab.alf, rx, ry);
alf->ctb_flag[LUMA] = alf->ctb_flag[CB] = alf->ctb_flag[CR] = 0;
+alf->ctb_cc_idc[0] = alf->ctb_cc_idc[1] = 0;
if (sh->sh_alf_enabled_flag) {
alf->ctb_flag[LUMA] = ff_vvc_alf_ctb_flag(lc, rx, ry, LUMA);
if (alf->ctb_flag[LUMA]) {
@@ -2318,7 +2319,6 @@ static void alf_params(VVCLocalContext *lc, const int rx,
const int ry)
const uint8_t cc_enabled[] = { sh->sh_alf_cc_cb_enabled_flag,
sh->sh_alf_cc_cr_enabled_flag };
const uint8_t cc_aps_id[] = { sh->sh_alf_cc_cb_aps_id,
sh->sh_alf_cc_cr_aps_id };
for (int i = 0; i < 2; i++) {
-alf->ctb_cc_idc[i] = 0;
if (cc_enabled[i]) {
const VVCALF *aps = fc->ps.alf_list[cc_aps_id[i]];
alf->ctb_cc_idc[i] = ff_vvc_alf_ctb_cc_idc(lc, rx, ry, i,
aps->num_cc_filters[i]);
--
2.43.0
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