hevc: derive partially amvp list

When the candidate has been found, no need to derive others.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/libavcodec/hevc_mvs.c b/libavcodec/hevc_mvs.c
index 7fa418b15b..12823c268f 100644
--- a/libavcodec/hevc_mvs.c
+++ b/libavcodec/hevc_mvs.c
@@ -722,6 +722,11 @@ void ff_hevc_luma_mv_mvp_mode(HEVCContext *s, int x0, int y0, int nPbW,
             availableFlagLXA0 = MP_MX_LT(A1, pred_flag_index_l1, mxA);
     }
 
+    if (availableFlagLXA0 && !mvp_lx_flag) {
+        mv->mv[LX] = mxA;
+        return;
+    }
+
     // B candidates
     // above right spatial merge candidate
     xB0    = x0 + nPbW;