From d4b9974465baf893e90527a366e7a7411ded1ef8 Mon Sep 17 00:00:00 2001
From: "Ronald S. Bultje" <rsbultje@gmail.com>
Date: Wed, 24 Aug 2011 14:36:16 -0700
Subject: [PATCH] vc1: properly zero coded_block[] edges on new slice entry.
Previously, we would leave the left edge uninitialized, which led to
CBP prediction errors on slice edges, e.g. in SA10098.vc1.
---
libavcodec/vc1dec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
index 8bf900c97d7..4954d4fd753 100644
--- a/libavcodec/vc1dec.c
+++ b/libavcodec/vc1dec.c
@@ -3019,7 +3019,7 @@ static void vc1_decode_i_blocks_adv(VC1Context *v)
s->mb_x = 0;
ff_init_block_index(s);
memset(&s->coded_block[s->block_index[0]-s->b8_stride], 0,
- s->b8_stride * sizeof(*s->coded_block));
+ (1 + s->b8_stride) * sizeof(*s->coded_block));
}
for(; s->mb_y < s->end_mb_y; s->mb_y++) {
s->mb_x = 0;
--
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