FFmpeg
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#include "libavutil/avconfig.h"
Go to the source code of this file.
Macros | |
#define | AV_NE(be, le) (le) |
#define | FFDIFFSIGN(x, y) (((x)>(y)) - ((x)<(y))) |
Comparator. More... | |
#define | FFMAX(a, b) ((a) > (b) ? (a) : (b)) |
#define | FFMAX3(a, b, c) FFMAX(FFMAX(a,b),c) |
#define | FFMIN(a, b) ((a) > (b) ? (b) : (a)) |
#define | FFMIN3(a, b, c) FFMIN(FFMIN(a,b),c) |
#define | FFSWAP(type, a, b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) |
#define | FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0])) |
#define | MKTAG(a, b, c, d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24)) |
#define | MKBETAG(a, b, c, d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24)) |
#define | AV_STRINGIFY(s) AV_TOSTRING(s) |
#define | AV_TOSTRING(s) #s |
#define | AV_GLUE(a, b) a ## b |
#define | AV_JOIN(a, b) AV_GLUE(a, b) |
#define | AV_PRAGMA(s) _Pragma(#s) |
#define | FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) |
Utility Preprocessor macros
Definition in file macros.h.
#define AV_NE | ( | be, | |
le | |||
) | (le) |
#define FFDIFFSIGN | ( | x, | |
y | |||
) | (((x)>(y)) - ((x)<(y))) |
Comparator.
For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0 if x == y. This is useful for instance in a qsort comparator callback. Furthermore, compilers are able to optimize this to branchless code, and there is no risk of overflow with signed types. As with many macros, this evaluates its argument multiple times, it thus must not have a side-effect.