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vc1dec: prevent v_edge_pos from becoming negative.

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Fixes assertion failure

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-12-05 23:16:21 +01:00
parent b6a7f66f93
commit bde6f6eadc
1 changed files with 2 additions and 1 deletions
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3
libavcodec/vc1dec.c
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@ -981,7 +981,8 @@ static void vc1_mc_4mv_chroma4(VC1Context *v)
uvmy_field[i] = (uvmy_field[i] & 3) << 1;
if (fieldmv && !(uvsrc_y & 1))
v_edge_pos--;
v_edge_pos = (s->v_edge_pos >> 1) - 1;
if (fieldmv && (uvsrc_y & 1) && uvsrc_y < 2)
uvsrc_y--;
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP)