/* * 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 … #else #define AV_NE(be, 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) … #define FFMAX(a,b) … #define FFMAX3(a,b,c) … #define FFMIN(a,b) … #define FFMIN3(a,b,c) … #define FFSWAP(type,a,b) … #define FF_ARRAY_ELEMS(a) … #define MKTAG(a,b,c,d) … #define MKBETAG(a,b,c,d) … /** * @addtogroup preproc_misc Preprocessor String Macros * * String manipulation macros * * @{ */ #define AV_STRINGIFY(s) … #define AV_TOSTRING(s) … #define AV_GLUE(a, b) … #define AV_JOIN(a, b) … /** * @} */ #define AV_PRAGMA(s) … #define FFALIGN(x, a) … #endif /* AVUTIL_MACROS_H */
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