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
  31 #if !HAVE_CBRTF
  32 static av_always_inline float cbrtf(float x)
  33 {
  34     return x < 0 ? -powf(-x, 1.0 / 3.0) : powf(x, 1.0 / 3.0);
  35 }
  36 #endif
  37
  38 #if !HAVE_EXP2
  39 #undef exp2
  40 #define exp2(x) exp((x) * 0.693147180559945)
  41 #endif /* HAVE_EXP2 */
  42
  43 #if !HAVE_EXP2F
  44 #undef exp2f
  45 #define exp2f(x) ((float)exp2(x))
  46 #endif /* HAVE_EXP2F */
  47
  48 #if !HAVE_LLRINT
  49 #undef llrint
  50 #define llrint(x) ((long long)rint(x))
  51 #endif /* HAVE_LLRINT */
  52
  53 #if !HAVE_LLRINTF
  54 #undef llrintf
  55 #define llrintf(x) ((long long)rint(x))
  56 #endif /* HAVE_LLRINT */
  57
  58 #if !HAVE_LOG2
  59 #undef log2
  60 #define log2(x) (log(x) * 1.44269504088896340736)
  61 #endif /* HAVE_LOG2 */
  62
  63 #if !HAVE_LOG2F
  64 #undef log2f
  65 #define log2f(x) ((float)log2(x))
  66 #endif /* HAVE_LOG2F */
  67
  68 #if !HAVE_LRINT
  69 static av_always_inline av_const long int lrint(double x)
  70 {
  71     return rint(x);
  72 }
  73 #endif /* HAVE_LRINT */
  74
  75 #if !HAVE_LRINTF
  76 static av_always_inline av_const long int lrintf(float x)
  77 {
  78     return (int)(rint(x));
  79 }
  80 #endif /* HAVE_LRINTF */
  81
  82 #if !HAVE_ROUND
  83 static av_always_inline av_const double round(double x)
  84 {
  85     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
  86 }
  87 #endif /* HAVE_ROUND */
  88
  89 #if !HAVE_ROUNDF
  90 static av_always_inline av_const float roundf(float x)
  91 {
  92     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
  93 }
  94 #endif /* HAVE_ROUNDF */
  95
  96 #if !HAVE_TRUNC
  97 static av_always_inline av_const double trunc(double x)
  98 {
  99     return (x > 0) ? floor(x) : ceil(x);
 100 }
 101 #endif /* HAVE_TRUNC */
 102
 103 #if !HAVE_TRUNCF
 104 static av_always_inline av_const float truncf(float x)
 105 {
 106     return (x > 0) ? floor(x) : ceil(x);
 107 }
 108 #endif /* HAVE_TRUNCF */
 109
 110 #endif /* AVUTIL_LIBM_H */