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avcodec/motion_est_template: fix undefined left shift of negative number 

This fixes -Wshift-negative-value reported with clang 3.7+, e.g
http://fate.ffmpeg.org/log.cgi?time=20150918181527&log=compile&slot=x86_64-darwin-clang-polly-vectorize-stripmine-3.7.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Ganesh Ajjanagadde 2015-09-19 13:18:16 -04:00 committed by Michael Niedermayer
parent 39ca7641c8
commit 11b563ed8f
1 changed files with 1 additions and 1 deletions
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libavcodec/motion_est_template.c
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@ -702,7 +702,7 @@ static int sab_diamond_search(MpegEncContext * s, int *best, int dmin,
key += (1<<(ME_MAP_MV_BITS-1)) + (1<<(2*ME_MAP_MV_BITS-1));
if((key&((-1)<<(2*ME_MAP_MV_BITS))) != map_generation) continue;
if((key&(-(1<<(2*ME_MAP_MV_BITS)))) != map_generation) continue;
minima[j].height= score_map[i];
minima[j].x= key & ((1<<ME_MAP_MV_BITS)-1); key>>=ME_MAP_MV_BITS;