81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
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/*
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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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