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new a2ff5eb55f avcodec/hevc/pred_template: substitute out-of-picture
samples with constrained intra pred
a2ff5eb55f is described below
commit a2ff5eb55f6eb34569d46b5a44104f7a2617d422
Author: Kieran Kunhya <[email protected]>
AuthorDate: Tue Oct 20 09:23:58 2026 -0400
Commit: kierank <[email protected]>
CommitDate: Thu Oct 22 11:46:09 2026 +0000
avcodec/hevc/pred_template: substitute out-of-picture samples with
constrained intra pred
When the bottom-left (or top-right) reference samples cross the picture
edge, the part outside the picture was filled from the last in-picture
sample before the constrained_intra_pred substitution, which only runs up
to the picture edge. If that sample belongs to an inter CU, its raw value
stayed in the out-of-picture part instead of the substituted one
(8.4.4.2.2), and the prediction no longer matched the encoder or HM.
Seen with x265 at 1080p, 64x64 CTBs and constrained intra prediction:
TUs in the partial bottom CTB row next to inter CUs mismatch from there
on.
---
libavcodec/hevc/pred_template.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/libavcodec/hevc/pred_template.c b/libavcodec/hevc/pred_template.c
index 9b27e53966..63e075e282 100644
--- a/libavcodec/hevc/pred_template.c
+++ b/libavcodec/hevc/pred_template.c
@@ -291,6 +291,14 @@ do { \
a = PIXEL_SPLAT_X4(left[-1]);
EXTEND_RIGHT_CIP(top, 0, size_max_x);
}
+ // Samples past the picture edge repeat the substituted last
+ // sample, not the one read before the substitution.
+ if (cand_bottom_left && bottom_left_size < size)
+ EXTEND(left + size + bottom_left_size, left[size +
bottom_left_size - 1],
+ size - bottom_left_size);
+ if (cand_up_right && top_right_size < size)
+ EXTEND(top + size + top_right_size, top[size + top_right_size
- 1],
+ size - top_right_size);
}
}
// Infer the unavailable samples
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