ffmpeg/libavutil/libm.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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_MIPSFPU && HAVE_INLINE_ASM
  33 #include "libavutil/mips/libm_mips.h"
  34 #endif /* HAVE_MIPSFPU && HAVE_INLINE_ASM*/
  35
  36 #if !HAVE_ATANF
  37 #undef atanf
  38 #define atanf(x) ((float)atan(x))
  39 #endif
  40
  41 #if !HAVE_ATAN2F
  42 #undef atan2f
  43 #define atan2f(y, x) ((float)atan2(y, x))
  44 #endif
  45
  46 #if !HAVE_POWF
  47 #undef powf
  48 #define powf(x, y) ((float)pow(x, y))
  49 #endif
  50
  51 #if !HAVE_CBRT
  52 static av_always_inline double cbrt(double x)
  53 {
  54     return x < 0 ? -pow(-x, 1.0 / 3.0) : pow(x, 1.0 / 3.0);
  55 }
  56 #endif
  57
  58 #if !HAVE_CBRTF
  59 static av_always_inline float cbrtf(float x)
  60 {
  61     return x < 0 ? -powf(-x, 1.0 / 3.0) : powf(x, 1.0 / 3.0);
  62 }
  63 #endif
  64
  65 #if !HAVE_COSF
  66 #undef cosf
  67 #define cosf(x) ((float)cos(x))
  68 #endif
  69
  70 #if !HAVE_EXPF
  71 #undef expf
  72 #define expf(x) ((float)exp(x))
  73 #endif
  74
  75 #if !HAVE_EXP2
  76 #undef exp2
  77 #define exp2(x) exp((x) * 0.693147180559945)
  78 #endif /* HAVE_EXP2 */
  79
  80 #if !HAVE_EXP2F
  81 #undef exp2f
  82 #define exp2f(x) ((float)exp2(x))
  83 #endif /* HAVE_EXP2F */
  84
  85 #if !HAVE_ISINF
  86 static av_always_inline av_const int isinf(float x)
  87 {
  88     uint32_t v = av_float2int(x);
  89     if ((v & 0x7f800000) != 0x7f800000)
  90         return 0;
  91     return !(v & 0x007fffff);
  92 }
  93 #endif /* HAVE_ISINF */
  94
  95 #if !HAVE_ISNAN
  96 static av_always_inline av_const int isnan(float x)
  97 {
  98     uint32_t v = av_float2int(x);
  99     if ((v & 0x7f800000) != 0x7f800000)
 100         return 0;
 101     return v & 0x007fffff;
 102 }
 103 #endif /* HAVE_ISNAN */
 104
 105 #if !HAVE_LDEXPF
 106 #undef ldexpf
 107 #define ldexpf(x, exp) ((float)ldexp(x, exp))
 108 #endif
 109
 110 #if !HAVE_LLRINT
 111 #undef llrint
 112 #define llrint(x) ((long long)rint(x))
 113 #endif /* HAVE_LLRINT */
 114
 115 #if !HAVE_LLRINTF
 116 #undef llrintf
 117 #define llrintf(x) ((long long)rint(x))
 118 #endif /* HAVE_LLRINT */
 119
 120 #if !HAVE_LOG2
 121 #undef log2
 122 #define log2(x) (log(x) * 1.44269504088896340736)
 123 #endif /* HAVE_LOG2 */
 124
 125 #if !HAVE_LOG2F
 126 #undef log2f
 127 #define log2f(x) ((float)log2(x))
 128 #endif /* HAVE_LOG2F */
 129
 130 #if !HAVE_LOG10F
 131 #undef log10f
 132 #define log10f(x) ((float)log10(x))
 133 #endif
 134
 135 #if !HAVE_SINF
 136 #undef sinf
 137 #define sinf(x) ((float)sin(x))
 138 #endif
 139
 140 #if !HAVE_RINT
 141 static inline double rint(double x)
 142 {
 143     return x >= 0 ? floor(x + 0.5) : ceil(x - 0.5);
 144 }
 145 #endif /* HAVE_RINT */
 146
 147 #if !HAVE_LRINT
 148 static av_always_inline av_const long int lrint(double x)
 149 {
 150     return rint(x);
 151 }
 152 #endif /* HAVE_LRINT */
 153
 154 #if !HAVE_LRINTF
 155 static av_always_inline av_const long int lrintf(float x)
 156 {
 157     return (int)(rint(x));
 158 }
 159 #endif /* HAVE_LRINTF */
 160
 161 #if !HAVE_ROUND
 162 static av_always_inline av_const double round(double x)
 163 {
 164     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 165 }
 166 #endif /* HAVE_ROUND */
 167
 168 #if !HAVE_ROUNDF
 169 static av_always_inline av_const float roundf(float x)
 170 {
 171     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 172 }
 173 #endif /* HAVE_ROUNDF */
 174
 175 #if !HAVE_TRUNC
 176 static av_always_inline av_const double trunc(double x)
 177 {
 178     return (x > 0) ? floor(x) : ceil(x);
 179 }
 180 #endif /* HAVE_TRUNC */
 181
 182 #if !HAVE_TRUNCF
 183 static av_always_inline av_const float truncf(float x)
 184 {
 185     return (x > 0) ? floor(x) : ceil(x);
 186 }
 187 #endif /* HAVE_TRUNCF */
 188
 189 #endif /* AVUTIL_LIBM_H */