libavutil/libm.h

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * Libav is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with Libav; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 /**
  20  * @file
  21  * Replacements for frequently missing libm functions
  22  */
  23
  24 #ifndef AVUTIL_LIBM_H
  25 #define AVUTIL_LIBM_H
  26
  27 #include <math.h>
  28 #include "config.h"
  29 #include "attributes.h"
  30 #include "intfloat.h"
  31
  32 #if !HAVE_CBRTF
  33 static av_always_inline float cbrtf(float x)
  34 {
  35     return x < 0 ? -powf(-x, 1.0 / 3.0) : powf(x, 1.0 / 3.0);
  36 }
  37 #endif
  38
  39 #if !HAVE_EXP2
  40 #undef exp2
  41 #define exp2(x) exp((x) * 0.693147180559945)
  42 #endif /* HAVE_EXP2 */
  43
  44 #if !HAVE_EXP2F
  45 #undef exp2f
  46 #define exp2f(x) ((float)exp2(x))
  47 #endif /* HAVE_EXP2F */
  48
  49 #if !HAVE_ISINF
  50 static av_always_inline av_const int isinf(float x)
  51 {
  52     uint32_t v = av_float2int(x);
  53     if ((v & 0x7f800000) != 0x7f800000)
  54         return 0;
  55     return !(v & 0x007fffff);
  56 }
  57 #endif /* HAVE_ISINF */
  58
  59 #if !HAVE_ISNAN
  60 static av_always_inline av_const int isnan(float x)
  61 {
  62     uint32_t v = av_float2int(x);
  63     if ((v & 0x7f800000) != 0x7f800000)
  64         return 0;
  65     return v & 0x007fffff;
  66 }
  67 #endif /* HAVE_ISNAN */
  68
  69 #if !HAVE_LLRINT
  70 #undef llrint
  71 #define llrint(x) ((long long)rint(x))
  72 #endif /* HAVE_LLRINT */
  73
  74 #if !HAVE_LLRINTF
  75 #undef llrintf
  76 #define llrintf(x) ((long long)rint(x))
  77 #endif /* HAVE_LLRINT */
  78
  79 #if !HAVE_LOG2
  80 #undef log2
  81 #define log2(x) (log(x) * 1.44269504088896340736)
  82 #endif /* HAVE_LOG2 */
  83
  84 #if !HAVE_LOG2F
  85 #undef log2f
  86 #define log2f(x) ((float)log2(x))
  87 #endif /* HAVE_LOG2F */
  88
  89 #if !HAVE_LRINT
  90 static av_always_inline av_const long int lrint(double x)
  91 {
  92     return rint(x);
  93 }
  94 #endif /* HAVE_LRINT */
  95
  96 #if !HAVE_LRINTF
  97 static av_always_inline av_const long int lrintf(float x)
  98 {
  99     return (int)(rint(x));
 100 }
 101 #endif /* HAVE_LRINTF */
 102
 103 #if !HAVE_ROUND
 104 static av_always_inline av_const double round(double x)
 105 {
 106     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 107 }
 108 #endif /* HAVE_ROUND */
 109
 110 #if !HAVE_ROUNDF
 111 static av_always_inline av_const float roundf(float x)
 112 {
 113     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 114 }
 115 #endif /* HAVE_ROUNDF */
 116
 117 #if !HAVE_TRUNC
 118 static av_always_inline av_const double trunc(double x)
 119 {
 120     return (x > 0) ? floor(x) : ceil(x);
 121 }
 122 #endif /* HAVE_TRUNC */
 123
 124 #if !HAVE_TRUNCF
 125 static av_always_inline av_const float truncf(float x)
 126 {
 127     return (x > 0) ? floor(x) : ceil(x);
 128 }
 129 #endif /* HAVE_TRUNCF */
 130
 131 #endif /* AVUTIL_LIBM_H */