intfloat.h 1.7 KB

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071727374757677
  1. /*
  2. * Copyright (c) 2011 Mans Rullgard
  3. *
  4. * This file is part of Libav.
  5. *
  6. * Libav 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. * Libav 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 Libav; if not, write to the Free Software
  18. * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19. */
  20. #ifndef AVUTIL_INTFLOAT_H
  21. #define AVUTIL_INTFLOAT_H
  22. #include <stdint.h>
  23. #include "attributes.h"
  24. union av_intfloat32 {
  25. uint32_t i;
  26. float f;
  27. };
  28. union av_intfloat64 {
  29. uint64_t i;
  30. double f;
  31. };
  32. /**
  33. * Reinterpret a 32-bit integer as a float.
  34. */
  35. static av_always_inline float av_int2float(uint32_t i)
  36. {
  37. union av_intfloat32 v;
  38. v.i = i;
  39. return v.f;
  40. }
  41. /**
  42. * Reinterpret a float as a 32-bit integer.
  43. */
  44. static av_always_inline uint32_t av_float2int(float f)
  45. {
  46. union av_intfloat32 v;
  47. v.f = f;
  48. return v.i;
  49. }
  50. /**
  51. * Reinterpret a 64-bit integer as a double.
  52. */
  53. static av_always_inline double av_int2double(uint64_t i)
  54. {
  55. union av_intfloat64 v;
  56. v.i = i;
  57. return v.f;
  58. }
  59. /**
  60. * Reinterpret a double as a 64-bit integer.
  61. */
  62. static av_always_inline uint64_t av_double2int(double f)
  63. {
  64. union av_intfloat64 v;
  65. v.f = f;
  66. return v.i;
  67. }
  68. #endif /* AVUTIL_INTFLOAT_H */