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FFmpeg/libavutil/intreadwrite.h

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  1. /*

  2.  * This file is part of FFmpeg.

  3.  *

  4.  * FFmpeg 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.  * FFmpeg 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 FFmpeg; if not, write to the Free Software

  16.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  17.  */

  18. 

  19. #ifndef FFMPEG_INTREADWRITE_H

  20. #define FFMPEG_INTREADWRITE_H

  21. 

  22. #include <stdint.h>

  23. #include "config.h"

  24. #include "bswap.h"

  25. 

  26. #ifdef __GNUC__

  27. 

  28. struct unaligned_64 { uint64_t l; } __attribute__((packed));

  29. struct unaligned_32 { uint32_t l; } __attribute__((packed));

  30. struct unaligned_16 { uint16_t l; } __attribute__((packed));

  31. 

  32. #define AV_RN16(a) (((const struct unaligned_16 *) (a))->l)

  33. #define AV_RN32(a) (((const struct unaligned_32 *) (a))->l)

  34. #define AV_RN64(a) (((const struct unaligned_64 *) (a))->l)

  35. 

  36. #define AV_WN16(a, b) (((struct unaligned_16 *) (a))->l) = (b)

  37. #define AV_WN32(a, b) (((struct unaligned_32 *) (a))->l) = (b)

  38. #define AV_WN64(a, b) (((struct unaligned_64 *) (a))->l) = (b)

  39. 

  40. #elif defined(__DECC)

  41. 

  42. #define AV_RN16(a) (*((const __unaligned uint16_t*)(a)))

  43. #define AV_RN32(a) (*((const __unaligned uint32_t*)(a)))

  44. #define AV_RN64(a) (*((const __unaligned uint64_t*)(a)))

  45. 

  46. #define AV_WN16(a, b) *((__unaligned uint16_t*)(a)) = (b)

  47. #define AV_WN32(a, b) *((__unaligned uint32_t*)(a)) = (b)

  48. #define AV_WN64(a, b) *((__unaligned uint64_t*)(a)) = (b)

  49. 

  50. #else

  51. 

  52. #define AV_RN16(a) (*((const uint16_t*)(a)))

  53. #define AV_RN32(a) (*((const uint32_t*)(a)))

  54. #define AV_RN64(a) (*((const uint64_t*)(a)))

  55. 

  56. #define AV_WN16(a, b) *((uint16_t*)(a)) = (b)

  57. #define AV_WN32(a, b) *((uint32_t*)(a)) = (b)

  58. #define AV_WN64(a, b) *((uint64_t*)(a)) = (b)

  59. 

  60. #endif /* !__GNUC__ */

  61. 

  62. /* endian macros */

  63. #define AV_RB8(x)     (((const uint8_t*)(x))[0])

  64. #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)

  65. 

  66. #define AV_RL8(x)     AV_RB8(x)

  67. #define AV_WL8(p, d)  AV_WB8(p, d)

  68. 

  69. #ifdef HAVE_FAST_UNALIGNED

  70. # ifdef WORDS_BIGENDIAN

  71. #  define AV_RB16(x)    AV_RN16(x)

  72. #  define AV_WB16(p, d) AV_WN16(p, d)

  73. 

  74. #  define AV_RL16(x)    bswap_16(AV_RN16(x))

  75. #  define AV_WL16(p, d) AV_WN16(p, bswap_16(d))

  76. 

  77. #  define AV_RB32(x)    AV_RN32(x)

  78. #  define AV_WB32(p, d) AV_WN32(p, d)

  79. 

  80. #  define AV_RL32(x)    bswap_32(AV_RN32(x))

  81. #  define AV_WL32(p, d) AV_WN32(p, bswap_32(d))

  82. 

  83. #  define AV_RB64(x)    AV_RN64(x)

  84. #  define AV_WB64(p, d) AV_WN64(p, d)

  85. 

  86. #  define AV_RL64(x)    bswap_64(AV_RN64(x))

  87. #  define AV_WL64(p, d) AV_WN64(p, bswap_64(d))

  88. # else /* WORDS_BIGENDIAN */

  89. #  define AV_RB16(x)    bswap_16(AV_RN16(x))

  90. #  define AV_WB16(p, d) AV_WN16(p, bswap_16(d))

  91. 

  92. #  define AV_RL16(x)    AV_RN16(x)

  93. #  define AV_WL16(p, d) AV_WN16(p, d)

  94. 

  95. #  define AV_RB32(x)    bswap_32(AV_RN32(x))

  96. #  define AV_WB32(p, d) AV_WN32(p, bswap_32(d))

  97. 

  98. #  define AV_RL32(x)    AV_RN32(x)

  99. #  define AV_WL32(p, d) AV_WN32(p, d)

  100. 

  101. #  define AV_RB64(x)    bswap_64(AV_RN64(x))

  102. #  define AV_WB64(p, d) AV_WN64(p, bswap_64(d))

  103. 

  104. #  define AV_RL64(x)    AV_RN64(x)

  105. #  define AV_WL64(p, d) AV_WN64(p, d)

  106. # endif

  107. #else /* HAVE_FAST_UNALIGNED */

  108. #define AV_RB16(x)  ((((const uint8_t*)(x))[0] << 8) | ((const uint8_t*)(x))[1])

  109. #define AV_WB16(p, d) do { \

  110.                     ((uint8_t*)(p))[1] = (d); \

  111.                     ((uint8_t*)(p))[0] = (d)>>8; } while(0)

  112. 

  113. #define AV_RL16(x)  ((((const uint8_t*)(x))[1] << 8) | \

  114.                       ((const uint8_t*)(x))[0])

  115. #define AV_WL16(p, d) do { \

  116.                     ((uint8_t*)(p))[0] = (d); \

  117.                     ((uint8_t*)(p))[1] = (d)>>8; } while(0)

  118. 

  119. #define AV_RB32(x)  ((((const uint8_t*)(x))[0] << 24) | \

  120.                      (((const uint8_t*)(x))[1] << 16) | \

  121.                      (((const uint8_t*)(x))[2] <<  8) | \

  122.                       ((const uint8_t*)(x))[3])

  123. #define AV_WB32(p, d) do { \

  124.                     ((uint8_t*)(p))[3] = (d); \

  125.                     ((uint8_t*)(p))[2] = (d)>>8; \

  126.                     ((uint8_t*)(p))[1] = (d)>>16; \

  127.                     ((uint8_t*)(p))[0] = (d)>>24; } while(0)

  128. 

  129. #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \

  130.                     (((const uint8_t*)(x))[2] << 16) | \

  131.                     (((const uint8_t*)(x))[1] <<  8) | \

  132.                      ((const uint8_t*)(x))[0])

  133. #define AV_WL32(p, d) do { \

  134.                     ((uint8_t*)(p))[0] = (d); \

  135.                     ((uint8_t*)(p))[1] = (d)>>8; \

  136.                     ((uint8_t*)(p))[2] = (d)>>16; \

  137.                     ((uint8_t*)(p))[3] = (d)>>24; } while(0)

  138. 

  139. #define AV_RB64(x)  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \

  140.                      ((uint64_t)((const uint8_t*)(x))[1] << 48) | \

  141.                      ((uint64_t)((const uint8_t*)(x))[2] << 40) | \

  142.                      ((uint64_t)((const uint8_t*)(x))[3] << 32) | \

  143.                      ((uint64_t)((const uint8_t*)(x))[4] << 24) | \

  144.                      ((uint64_t)((const uint8_t*)(x))[5] << 16) | \

  145.                      ((uint64_t)((const uint8_t*)(x))[6] <<  8) | \

  146.                       (uint64_t)((const uint8_t*)(x))[7])

  147. #define AV_WB64(p, d) do { \

  148.                     ((uint8_t*)(p))[7] = (d);     \

  149.                     ((uint8_t*)(p))[6] = (d)>>8;  \

  150.                     ((uint8_t*)(p))[5] = (d)>>16; \

  151.                     ((uint8_t*)(p))[4] = (d)>>24; \

  152.                     ((uint8_t*)(p))[3] = (d)>>32; \

  153.                     ((uint8_t*)(p))[2] = (d)>>40; \

  154.                     ((uint8_t*)(p))[1] = (d)>>48; \

  155.                     ((uint8_t*)(p))[0] = (d)>>56; } while(0)

  156. 

  157. #define AV_RL64(x)  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \

  158.                      ((uint64_t)((const uint8_t*)(x))[6] << 48) | \

  159.                      ((uint64_t)((const uint8_t*)(x))[5] << 40) | \

  160.                      ((uint64_t)((const uint8_t*)(x))[4] << 32) | \

  161.                      ((uint64_t)((const uint8_t*)(x))[3] << 24) | \

  162.                      ((uint64_t)((const uint8_t*)(x))[2] << 16) | \

  163.                      ((uint64_t)((const uint8_t*)(x))[1] <<  8) | \

  164.                       (uint64_t)((const uint8_t*)(x))[0])

  165. #define AV_WL64(p, d) do { \

  166.                     ((uint8_t*)(p))[0] = (d);     \

  167.                     ((uint8_t*)(p))[1] = (d)>>8;  \

  168.                     ((uint8_t*)(p))[2] = (d)>>16; \

  169.                     ((uint8_t*)(p))[3] = (d)>>24; \

  170.                     ((uint8_t*)(p))[4] = (d)>>32; \

  171.                     ((uint8_t*)(p))[5] = (d)>>40; \

  172.                     ((uint8_t*)(p))[6] = (d)>>48; \

  173.                     ((uint8_t*)(p))[7] = (d)>>56; } while(0)

  174. #endif  /* HAVE_FAST_UNALIGNED */

  175. 

  176. #define AV_RB24(x)  ((((const uint8_t*)(x))[0] << 16) | \

  177.                      (((const uint8_t*)(x))[1] <<  8) | \

  178.                       ((const uint8_t*)(x))[2])

  179. #define AV_WB24(p, d) do { \

  180.                     ((uint8_t*)(p))[2] = (d); \

  181.                     ((uint8_t*)(p))[1] = (d)>>8; \

  182.                     ((uint8_t*)(p))[0] = (d)>>16; } while(0)

  183. 

  184. #define AV_RL24(x)  ((((const uint8_t*)(x))[2] << 16) | \

  185.                      (((const uint8_t*)(x))[1] <<  8) | \

  186.                       ((const uint8_t*)(x))[0])

  187. #define AV_WL24(p, d) do { \

  188.                     ((uint8_t*)(p))[0] = (d); \

  189.                     ((uint8_t*)(p))[1] = (d)>>8; \

  190.                     ((uint8_t*)(p))[2] = (d)>>16; } while(0)

  191. 

  192. #endif /* FFMPEG_INTREADWRITE_H */