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avcodec/dvdec: Fix "left shift of negative value -254"

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Fixes: dvdec_left_shift.avi

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-10 17:43:56 +01:00
parent 030c7f0309
commit 93ac72a98d
1 changed files with 1 additions and 1 deletions
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2
libavcodec/dvdec.c
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@ -347,7 +347,7 @@ retry:
dct_mode * 22 * 64 + dct_mode * 22 * 64 +
(quant + ff_dv_quant_offset[class1]) * 64]; (quant + ff_dv_quant_offset[class1]) * 64];
} }
dc = dc << 2; dc = dc * 4;
/* convert to unsigned because 128 is not added in the /* convert to unsigned because 128 is not added in the
* standard IDCT */ * standard IDCT */
dc += 1024; dc += 1024;