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  1. /*
  2.  * Copyright (c) 2011 Mans Rullgard
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVUTIL_INTFLOAT_H
  22. #define AVUTIL_INTFLOAT_H
  23.  
  24. #include <stdint.h>
  25. #include "attributes.h"
  26.  
  27. union av_intfloat32 {
  28.     uint32_t i;
  29.     float    f;
  30. };
  31.  
  32. union av_intfloat64 {
  33.     uint64_t i;
  34.     double   f;
  35. };
  36.  
  37. /**
  38.  * Reinterpret a 32-bit integer as a float.
  39.  */
  40. static av_always_inline float av_int2float(uint32_t i)
  41. {
  42.     union av_intfloat32 v;
  43.     v.i = i;
  44.     return v.f;
  45. }
  46.  
  47. /**
  48.  * Reinterpret a float as a 32-bit integer.
  49.  */
  50. static av_always_inline uint32_t av_float2int(float f)
  51. {
  52.     union av_intfloat32 v;
  53.     v.f = f;
  54.     return v.i;
  55. }
  56.  
  57. /**
  58.  * Reinterpret a 64-bit integer as a double.
  59.  */
  60. static av_always_inline double av_int2double(uint64_t i)
  61. {
  62.     union av_intfloat64 v;
  63.     v.i = i;
  64.     return v.f;
  65. }
  66.  
  67. /**
  68.  * Reinterpret a double as a 64-bit integer.
  69.  */
  70. static av_always_inline uint64_t av_double2int(double f)
  71. {
  72.     union av_intfloat64 v;
  73.     v.f = f;
  74.     return v.i;
  75. }
  76.  
  77. #endif /* AVUTIL_INTFLOAT_H */
  78.