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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>
(cherry picked from commit 93ac72a98dff592ffc174cfb36a8975dfbf145ae)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2016-01-10 17:43:56 +01:00
parent 9cad208223
commit b8382a1fae
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 +
(quant + ff_dv_quant_offset[class1]) * 64];
}
dc = dc << 2;
dc = dc * 4;
/* convert to unsigned because 128 is not added in the
* standard IDCT */
dc += 1024;