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libavutil/libm.h

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00001 /*
00002  * This file is part of FFmpeg.
00003  *
00004  * FFmpeg is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * FFmpeg is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with FFmpeg; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00024 #ifndef AVUTIL_LIBM_H
00025 #define AVUTIL_LIBM_H
00026 
00027 #include <math.h>
00028 #include "config.h"
00029 #include "attributes.h"
00030 
00031 #if !HAVE_EXP2
00032 #undef exp2
00033 #define exp2(x) exp((x) * 0.693147180559945)
00034 #endif /* HAVE_EXP2 */
00035 
00036 #if !HAVE_EXP2F
00037 #undef exp2f
00038 #define exp2f(x) ((float)exp2(x))
00039 #endif /* HAVE_EXP2F */
00040 
00041 #if !HAVE_LLRINT
00042 #undef llrint
00043 #define llrint(x) ((long long)rint(x))
00044 #endif /* HAVE_LLRINT */
00045 
00046 #if !HAVE_LLRINTF
00047 #undef llrintf
00048 #define llrintf(x) ((long long)rint(x))
00049 #endif /* HAVE_LLRINT */
00050 
00051 #if !HAVE_LOG2
00052 #undef log2
00053 #define log2(x) (log(x) * 1.44269504088896340736)
00054 #endif /* HAVE_LOG2 */
00055 
00056 #if !HAVE_LOG2F
00057 #undef log2f
00058 #define log2f(x) ((float)log2(x))
00059 #endif /* HAVE_LOG2F */
00060 
00061 #if !HAVE_LRINT
00062 static av_always_inline av_const long int lrint(double x)
00063 {
00064     return rint(x);
00065 }
00066 #endif /* HAVE_LRINT */
00067 
00068 #if !HAVE_LRINTF
00069 static av_always_inline av_const long int lrintf(float x)
00070 {
00071     return (int)(rint(x));
00072 }
00073 #endif /* HAVE_LRINTF */
00074 
00075 #if !HAVE_ROUND
00076 static av_always_inline av_const double round(double x)
00077 {
00078     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
00079 }
00080 #endif /* HAVE_ROUND */
00081 
00082 #if !HAVE_ROUNDF
00083 static av_always_inline av_const float roundf(float x)
00084 {
00085     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
00086 }
00087 #endif /* HAVE_ROUNDF */
00088 
00089 #if !HAVE_TRUNCF
00090 static av_always_inline av_const float truncf(float x)
00091 {
00092     return (x > 0) ? floor(x) : ceil(x);
00093 }
00094 #endif /* HAVE_TRUNCF */
00095 
00096 #endif /* AVUTIL_LIBM_H */

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