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80 lines
2.3 KiB
80 lines
2.3 KiB
/* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* @ingroup lavu |
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* Utility Preprocessor macros |
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*/ |
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#ifndef AVUTIL_MACROS_H |
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#define AVUTIL_MACROS_H |
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#include "libavutil/avconfig.h" |
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#if AV_HAVE_BIGENDIAN |
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# define AV_NE(be, le) (be) |
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#else |
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# define AV_NE(be, le) (le) |
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#endif |
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/** |
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* Comparator. |
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* For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0 |
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* if x == y. This is useful for instance in a qsort comparator callback. |
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* Furthermore, compilers are able to optimize this to branchless code, and |
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* there is no risk of overflow with signed types. |
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* As with many macros, this evaluates its argument multiple times, it thus |
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* must not have a side-effect. |
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*/ |
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#define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y))) |
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#define FFMAX(a,b) ((a) > (b) ? (a) : (b)) |
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#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c) |
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a)) |
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#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c) |
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#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) |
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0])) |
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#define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24)) |
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#define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24)) |
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/** |
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* @addtogroup preproc_misc Preprocessor String Macros |
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* |
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* String manipulation macros |
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* |
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* @{ |
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*/ |
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#define AV_STRINGIFY(s) AV_TOSTRING(s) |
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#define AV_TOSTRING(s) #s |
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#define AV_GLUE(a, b) a ## b |
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#define AV_JOIN(a, b) AV_GLUE(a, b) |
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/** |
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* @} |
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*/ |
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#define AV_PRAGMA(s) _Pragma(#s) |
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#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) |
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#endif /* AVUTIL_MACROS_H */
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