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

Message ID 20201016135734.9753-1-oddstone@gmail.com
State New
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Series [FFmpeg-devel] avcodec/hevcdec: constrained intra predict, do not check top left IS_INTRA if it's not available
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Commit Message

Xu Guangxin Oct. 16, 2020, 1:57 p.m. UTC
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
---
 libavcodec/hevcpred_template.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/libavcodec/hevcpred_template.c b/libavcodec/hevcpred_template.c
index 6fe33546b1..e550707874 100644
--- a/libavcodec/hevcpred_template.c
+++ b/libavcodec/hevcpred_template.c
@@ -213,7 +213,7 @@  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);