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avcodec/snowenc: sign extend a variable before shifting
Fixes "libavcodec/snowenc.c:718:27: runtime error: left shift of 8509032 by 8 places cannot be represented in type 'int'" as seen in fate-vsynth2-snow-hpel under ubsan. Signed-off-by: James Almer <jamrial@gmail.com>
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@ -715,7 +715,7 @@ static int get_dc(SnowEncContext *enc, int mb_x, int mb_y, int plane_index)
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}
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*b= backup;
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return av_clip_uint8( ROUNDED_DIV(ab<<LOG2_OBMC_MAX, aa) ); //FIXME we should not need clipping
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return av_clip_uint8( ROUNDED_DIV((int64_t)ab<<LOG2_OBMC_MAX, aa) ); //FIXME we should not need clipping
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}
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static inline int get_block_bits(SnowContext *s, int x, int y, int w){
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