[FFmpeg-cvslog] avcodec/hevcdec: constrained intra predict, do not check top left IS_INTRA if it's not available

[Xu Guangxin]

ffmpeg | branch: master | Xu Guangxin <oddstone at gmail.com> | Fri Oct 16 21:57:34 2020 +0800| [e5be4c5a88df90477f36cc81993d10f41d6180ce] | committer: Linjie Fu

avcodec/hevcdec: constrained intra predict, do not check top left IS_INTRA if it's not available

fix ticket: 8932

For poc 2, we have tile boundary at x = 640.
When we predict cu(640,912),the top left pixel is not avaliable to the cu.
So, we can not check it's intra or not. We need set top[-1] = top[0] directly.
see 8.4.4.2.1 for details

Signed-off-by: Xu Guangxin <oddstone at gmail.com>
Signed-off-by: Linjie Fu <linjie.justin.fu at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e5be4c5a88df90477f36cc81993d10f41d6180ce
---

 libavcodec/hevcpred_template.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/hevcpred_template.c b/libavcodec/hevcpred_template.c
index f1a1f4c1f0..ca75ec1128 100644
--- a/libavcodec/hevcpred_template.c
+++ b/libavcodec/hevcpred_template.c
@@ -214,7 +214,7 @@ do {                                  \
                 while (j < size_max_x && !IS_INTRA(j, -1))
                     j++;
                 if (j > 0)
-                    if (x0 > 0) {
+                    if (cand_up_left) {
                         EXTEND_LEFT_CIP(top, j, j + 1);
                     } else {
                         EXTEND_LEFT_CIP(top, j, j);