mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
2dd8acbe80
common.h currently contains several things: Math macros, UTF-8 macros, other fundamental macros; furthermore it also contains miscellaneous math functions and it (directly and indirectly) includes lots of other headers. This commit moves the "other fundamental macros" to macros.h which is a more fitting place. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* @ingroup lavu
|
|
* Utility Preprocessor macros
|
|
*/
|
|
|
|
#ifndef AVUTIL_MACROS_H
|
|
#define AVUTIL_MACROS_H
|
|
|
|
#include "libavutil/avconfig.h"
|
|
|
|
#if AV_HAVE_BIGENDIAN
|
|
# define AV_NE(be, le) (be)
|
|
#else
|
|
# define AV_NE(be, le) (le)
|
|
#endif
|
|
|
|
/**
|
|
* 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.
|
|
*/
|
|
#define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))
|
|
|
|
#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))
|
|
|
|
/**
|
|
* @addtogroup preproc_misc Preprocessor String Macros
|
|
*
|
|
* String manipulation macros
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
#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))
|
|
|
|
#endif /* AVUTIL_MACROS_H */
|