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authorMans Rullgard <mans@mansr.com>2012-08-10 01:14:32 +0100
committerMans Rullgard <mans@mansr.com>2012-08-10 12:18:38 +0100
commit52aa3015a3c895cf74e555c4bb56c08cd067383e (patch)
treecb304e7a3d6d5f654c2c30184c8a4b5d1173ed28 /libavfilter/video.c
parente141cf2c5794cd9884f2806b7766a1e0bb47ebe5 (diff)
downloadffmpeg-52aa3015a3c895cf74e555c4bb56c08cd067383e.tar.gz
g723.1: simplify and fix multiplication overflow
In 16-bit arithmetic, x * 0xffffc is simply x * -4 with extra overflows, (and the constant was probably meant to be 0xfffc). Combined with the shift, this simplifies to -x >> 1. Finally, clearing the low two bits with a 32-bit mask and switching to a 32-bit type allows more efficient code on 32-bit machines. Signed-off-by: Mans Rullgard <mans@mansr.com>
Diffstat (limited to 'libavfilter/video.c')
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