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lavu/common: add an explanation to FF_CEIL_RSHIFT()

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This commit is contained in:
Clément Bœsch 2016-01-07 22:34:04 +01:00
parent 5fbe57c027
commit 04826b7ff0
1 changed files with 1 additions and 1 deletions
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2
libavutil/common.h
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@ -54,7 +54,7 @@
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
/* assume b>0 */ /* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
/* assume a>=0 and b>=0 */ /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
#define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ #define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
: ((a) + (1<<(b)) - 1) >> (b)) : ((a) + (1<<(b)) - 1) >> (b))
#define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b)) #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))