hevc: fix skip_flag

cherry picked from commit 509ae45655

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc.c

@@ -97,7 +97,7 @@ static int pic_arrays_init(HEVCContext *s, const HEVCSPS *sps)
     if (!s->sao || !s->deblock)
         goto fail;
 
-    s->skip_flag    = av_malloc(pic_size_in_ctb);
+    s->skip_flag    = av_malloc(sps->min_cb_height * sps->min_cb_width);
     s->tab_ct_depth = av_malloc_array(sps->min_cb_height, sps->min_cb_width);
     if (!s->skip_flag || !s->tab_ct_depth)
         goto fail;
@@ -2019,6 +2019,12 @@ static int hls_coding_unit(HEVCContext *s, int x0, int y0, int log2_cb_size)
             x += min_cb_width;
         }
         lc->cu.pred_mode = skip_flag ? MODE_SKIP : MODE_INTER;
+    } else {
+        x = y_cb * min_cb_width + x_cb;
+        for (y = 0; y < length; y++) {
+            memset(&s->skip_flag[x], 0, length);
+            x += min_cb_width;
+        }
     }
 
     if (SAMPLE_CTB(s->skip_flag, x_cb, y_cb)) {

libavcodec/hevc_refs.c

@@ -51,16 +51,11 @@ void ff_hevc_unref_frame(HEVCContext *s, HEVCFrame *frame, int flags)
 
 RefPicList *ff_hevc_get_ref_list(HEVCContext *s, HEVCFrame *ref, int x0, int y0)
 {
-    if (x0 < 0 || y0 < 0) {
-        return s->ref->refPicList;
-    } else {
-        int x_cb         = x0 >> s->sps->log2_ctb_size;
-        int y_cb         = y0 >> s->sps->log2_ctb_size;
-        int pic_width_cb = (s->sps->width + (1 << s->sps->log2_ctb_size) - 1) >>
-                           s->sps->log2_ctb_size;
-        int ctb_addr_ts  = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
-        return (RefPicList *)ref->rpl_tab[ctb_addr_ts];
-    }
+    int x_cb         = x0 >> s->sps->log2_ctb_size;
+    int y_cb         = y0 >> s->sps->log2_ctb_size;
+    int pic_width_cb = s->sps->ctb_width;
+    int ctb_addr_ts  = s->pps->ctb_addr_rs_to_ts[y_cb * pic_width_cb + x_cb];
+    return (RefPicList *)ref->rpl_tab[ctb_addr_ts];
 }
 
 void ff_hevc_clear_refs(HEVCContext *s)