bswap.h 2.8 KB

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  1. /*
  2. * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
  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. * @file
  22. * byte swapping routines
  23. */
  24. #ifndef AVUTIL_BSWAP_H
  25. #define AVUTIL_BSWAP_H
  26. #include <stdint.h>
  27. #include "libavutil/avconfig.h"
  28. #include "attributes.h"
  29. #ifdef HAVE_AV_CONFIG_H
  30. #include "config.h"
  31. #if ARCH_ARM
  32. # include "arm/bswap.h"
  33. #elif ARCH_AVR32
  34. # include "avr32/bswap.h"
  35. #elif ARCH_BFIN
  36. # include "bfin/bswap.h"
  37. #elif ARCH_SH4
  38. # include "sh4/bswap.h"
  39. #elif ARCH_X86
  40. # include "x86/bswap.h"
  41. #endif
  42. #endif /* HAVE_AV_CONFIG_H */
  43. #define AV_BSWAP16C(x) (((x) << 8 & 0xff00) | ((x) >> 8 & 0x00ff))
  44. #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
  45. #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
  46. #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
  47. #ifndef av_bswap16
  48. static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
  49. {
  50. x= (x>>8) | (x<<8);
  51. return x;
  52. }
  53. #endif
  54. #ifndef av_bswap32
  55. static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  56. {
  57. return AV_BSWAP32C(x);
  58. }
  59. #endif
  60. #ifndef av_bswap64
  61. static inline uint64_t av_const av_bswap64(uint64_t x)
  62. {
  63. return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
  64. }
  65. #endif
  66. // be2ne ... big-endian to native-endian
  67. // le2ne ... little-endian to native-endian
  68. #if AV_HAVE_BIGENDIAN
  69. #define av_be2ne16(x) (x)
  70. #define av_be2ne32(x) (x)
  71. #define av_be2ne64(x) (x)
  72. #define av_le2ne16(x) av_bswap16(x)
  73. #define av_le2ne32(x) av_bswap32(x)
  74. #define av_le2ne64(x) av_bswap64(x)
  75. #define AV_BE2NEC(s, x) (x)
  76. #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
  77. #else
  78. #define av_be2ne16(x) av_bswap16(x)
  79. #define av_be2ne32(x) av_bswap32(x)
  80. #define av_be2ne64(x) av_bswap64(x)
  81. #define av_le2ne16(x) (x)
  82. #define av_le2ne32(x) (x)
  83. #define av_le2ne64(x) (x)
  84. #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
  85. #define AV_LE2NEC(s, x) (x)
  86. #endif
  87. #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
  88. #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
  89. #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
  90. #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
  91. #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
  92. #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
  93. #endif /* AVUTIL_BSWAP_H */