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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. /**
  22.  * @file
  23.  * byte swapping routines
  24.  */
  25.  
  26. #ifndef AVUTIL_BSWAP_H
  27. #define AVUTIL_BSWAP_H
  28.  
  29. #include <stdint.h>
  30. #include "libavutil/avconfig.h"
  31. #include "attributes.h"
  32.  
  33. #ifdef HAVE_AV_CONFIG_H
  34.  
  35. #include "config.h"
  36.  
  37. #if   ARCH_ARM
  38. #   include "arm/bswap.h"
  39. #elif ARCH_AVR32
  40. #   include "avr32/bswap.h"
  41. #elif ARCH_BFIN
  42. #   include "bfin/bswap.h"
  43. #elif ARCH_SH4
  44. #   include "sh4/bswap.h"
  45. #elif ARCH_X86
  46. #   include "x86/bswap.h"
  47. #endif
  48.  
  49. #endif /* HAVE_AV_CONFIG_H */
  50.  
  51. #define AV_BSWAP16C(x) (((x) << 8 & 0xff00)  | ((x) >> 8 & 0x00ff))
  52. #define AV_BSWAP32C(x) (AV_BSWAP16C(x) << 16 | AV_BSWAP16C((x) >> 16))
  53. #define AV_BSWAP64C(x) (AV_BSWAP32C(x) << 32 | AV_BSWAP32C((x) >> 32))
  54.  
  55. #define AV_BSWAPC(s, x) AV_BSWAP##s##C(x)
  56.  
  57. #ifndef av_bswap16
  58. static av_always_inline av_const uint16_t av_bswap16(uint16_t x)
  59. {
  60.     x= (x>>8) | (x<<8);
  61.     return x;
  62. }
  63. #endif
  64.  
  65. #ifndef av_bswap32
  66. static av_always_inline av_const uint32_t av_bswap32(uint32_t x)
  67. {
  68.     return AV_BSWAP32C(x);
  69. }
  70. #endif
  71.  
  72. #ifndef av_bswap64
  73. static inline uint64_t av_const av_bswap64(uint64_t x)
  74. {
  75.     return (uint64_t)av_bswap32(x) << 32 | av_bswap32(x >> 32);
  76. }
  77. #endif
  78.  
  79. // be2ne ... big-endian to native-endian
  80. // le2ne ... little-endian to native-endian
  81.  
  82. #if AV_HAVE_BIGENDIAN
  83. #define av_be2ne16(x) (x)
  84. #define av_be2ne32(x) (x)
  85. #define av_be2ne64(x) (x)
  86. #define av_le2ne16(x) av_bswap16(x)
  87. #define av_le2ne32(x) av_bswap32(x)
  88. #define av_le2ne64(x) av_bswap64(x)
  89. #define AV_BE2NEC(s, x) (x)
  90. #define AV_LE2NEC(s, x) AV_BSWAPC(s, x)
  91. #else
  92. #define av_be2ne16(x) av_bswap16(x)
  93. #define av_be2ne32(x) av_bswap32(x)
  94. #define av_be2ne64(x) av_bswap64(x)
  95. #define av_le2ne16(x) (x)
  96. #define av_le2ne32(x) (x)
  97. #define av_le2ne64(x) (x)
  98. #define AV_BE2NEC(s, x) AV_BSWAPC(s, x)
  99. #define AV_LE2NEC(s, x) (x)
  100. #endif
  101.  
  102. #define AV_BE2NE16C(x) AV_BE2NEC(16, x)
  103. #define AV_BE2NE32C(x) AV_BE2NEC(32, x)
  104. #define AV_BE2NE64C(x) AV_BE2NEC(64, x)
  105. #define AV_LE2NE16C(x) AV_LE2NEC(16, x)
  106. #define AV_LE2NE32C(x) AV_LE2NEC(32, x)
  107. #define AV_LE2NE64C(x) AV_LE2NEC(64, x)
  108.  
  109. #endif /* AVUTIL_BSWAP_H */
  110.