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ape: Avoid undefined behaviour 

Avoid the clang warning

"warning: shifting a negative signed value is undefined"
This commit is contained in:
Luca Barbato 2016-04-12 22:14:26 +02:00
parent 6b2ad3ca48
commit f3fdef108e
1 changed files with 1 additions and 1 deletions
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2
libavcodec/apedec.c
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@ -1305,7 +1305,7 @@ static void do_apply_filter(APEContext *ctx, int version, APEFilter *f,
/* Update the adaption coefficients */
absres = FFABS(res);
if (absres)
*f->adaptcoeffs = ((res & (-1<<31)) ^ (-1<<30)) >>
*f->adaptcoeffs = ((res & ((~0UL) << 31)) ^ ((~0UL) << 30)) >>
(25 + (absres <= f->avg*3) + (absres <= f->avg*4/3));
else
*f->adaptcoeffs = 0;