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vp56: Check for missing reference frame data 

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
This commit is contained in:
Laurent Aimar 2011-09-21 20:46:30 +02:00 committed by Janne Grunau
parent d239d4b447
commit 0ec6d6e9b6
1 changed files with 2 additions and 0 deletions
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libavcodec/vp56.c
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@ -401,6 +401,8 @@ static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
frame_current = s->framep[VP56_FRAME_CURRENT];
frame_ref = s->framep[ref_frame];
if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
return;
ab = 6*is_alpha;
b_max = 6 - 2*is_alpha;