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avutil/common: Document FFABS() corner case

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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Michael Niedermayer 2015-09-03 02:00:05 +02:00
parent 26a0cd1b4b
commit 733511fb53
1 changed files with 6 additions and 0 deletions
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6
libavutil/common.h
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@ -58,6 +58,12 @@
: ((a) + (1<<(b)) - 1) >> (b))
#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
#define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
/**
* Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
* are not representable as absolute values of their type. This is the same
* as with *abs()
*/
#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFSIGN(a) ((a) > 0 ? 1 : -1)