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avcodec/diracdec: fix undefined behavior with shifts
Fixes part of Ticket3466 Found-by: Andrey_Karpov / PVS-Studio Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -1355,8 +1355,8 @@ static int mc_subpel(DiracContext *s, DiracBlock *block, const uint8_t *src[5],
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motion_y >>= s->chroma_y_shift;
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}
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mx = motion_x & ~(-1 << s->mv_precision);
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my = motion_y & ~(-1 << s->mv_precision);
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mx = motion_x & ~(-1U << s->mv_precision);
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my = motion_y & ~(-1U << s->mv_precision);
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motion_x >>= s->mv_precision;
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motion_y >>= s->mv_precision;
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/* normalize subpel coordinates to epel */
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