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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 AVUTIL_INTREADWRITE_H

  20. #define AVUTIL_INTREADWRITE_H

  21. 

  22. #include <stdint.h>

  23. #include "config.h"

  24. #include "bswap.h"

  25. 

  26. /*

  27.  * Arch-specific headers can provide any combination of

  28.  * AV_[RW][BLN](16|32|64) macros.  Preprocessor symbols must be

  29.  * defined, even if these are implemented as inline functions.

  30.  */

  31. 

  32. #if   ARCH_ARM

  33. #   include "arm/intreadwrite.h"

  34. #endif

  35. 

  36. /*

  37.  * Define AV_[RW]N helper macros to simplify definitions not provided

  38.  * by per-arch headers.

  39.  */

  40. 

  41. #if   defined(__GNUC__)

  42. 

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

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

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

  46. 

  47. #   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)

  48. #   define AV_WN(s, p, v) (((struct unaligned_##s *) (p))->l) = (v)

  49. 

  50. #elif defined(__DECC)

  51. 

  52. #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))

  53. #   define AV_WN(s, p, v) *((__unaligned uint##s##_t*)(p)) = (v)

  54. 

  55. #elif HAVE_FAST_UNALIGNED

  56. 

  57. #   define AV_RN(s, p) (*((const uint##s##_t*)(p)))

  58. #   define AV_WN(s, p, v) *((uint##s##_t*)(p)) = (v)

  59. 

  60. #else

  61. 

  62. #ifndef AV_RB16

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

  64.                       ((const uint8_t*)(x))[1])

  65. #endif

  66. #ifndef AV_WB16

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

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

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

  70. #endif

  71. 

  72. #ifndef AV_RL16

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

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

  75. #endif

  76. #ifndef AV_WL16

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

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

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

  80. #endif

  81. 

  82. #ifndef AV_RB32

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

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

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

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

  87. #endif

  88. #ifndef AV_WB32

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

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

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

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

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

  94. #endif

  95. 

  96. #ifndef AV_RL32

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

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

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

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

  101. #endif

  102. #ifndef AV_WL32

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

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

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

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

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

  108. #endif

  109. 

  110. #ifndef AV_RB64

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

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

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

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

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

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

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

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

  119. #endif

  120. #ifndef AV_WB64

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

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

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

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

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

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

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

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

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

  130. #endif

  131. 

  132. #ifndef AV_RL64

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

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

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

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

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

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

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

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

  141. #endif

  142. #ifndef AV_WL64

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

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

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

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

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

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

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

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

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

  152. #endif

  153. 

  154. #ifdef WORDS_BIGENDIAN

  155. #   define AV_RN(s, p)    AV_RB##s(p)

  156. #   define AV_WN(s, p, v) AV_WB##s(p, v)

  157. #else

  158. #   define AV_RN(s, p)    AV_RL##s(p)

  159. #   define AV_WN(s, p, v) AV_WL##s(p, v)

  160. #endif

  161. 

  162. #endif /* HAVE_FAST_UNALIGNED */

  163. 

  164. #ifndef AV_RN16

  165. #   define AV_RN16(p) AV_RN(16, p)

  166. #endif

  167. 

  168. #ifndef AV_RN32

  169. #   define AV_RN32(p) AV_RN(32, p)

  170. #endif

  171. 

  172. #ifndef AV_RN64

  173. #   define AV_RN64(p) AV_RN(64, p)

  174. #endif

  175. 

  176. #ifndef AV_WN16

  177. #   define AV_WN16(p, v) AV_WN(16, p, v)

  178. #endif

  179. 

  180. #ifndef AV_WN32

  181. #   define AV_WN32(p, v) AV_WN(32, p, v)

  182. #endif

  183. 

  184. #ifndef AV_WN64

  185. #   define AV_WN64(p, v) AV_WN(64, p, v)

  186. #endif

  187. 

  188. #ifdef WORDS_BIGENDIAN

  189. #   define AV_RB(s, p)    AV_RN(s, p)

  190. #   define AV_WB(s, p, v) AV_WN(s, p, v)

  191. #   define AV_RL(s, p)    bswap_##s(AV_RN(s, p))

  192. #   define AV_WL(s, p, v) AV_WN(s, p, bswap_##s(v))

  193. #else

  194. #   define AV_RB(s, p)    bswap_##s(AV_RN(s, p))

  195. #   define AV_WB(s, p, v) AV_WN(s, p, bswap_##s(v))

  196. #   define AV_RL(s, p)    AV_RN(s, p)

  197. #   define AV_WL(s, p, v) AV_WN(s, p, v)

  198. #endif

  199. 

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

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

  202. 

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

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

  205. 

  206. #ifndef AV_RB16

  207. #   define AV_RB16(p)    AV_RB(16, p)

  208. #endif

  209. #ifndef AV_WB16

  210. #   define AV_WB16(p, v) AV_WB(16, p, v)

  211. #endif

  212. 

  213. #ifndef AV_RL16

  214. #   define AV_RL16(p)    AV_RL(16, p)

  215. #endif

  216. #ifndef AV_WL16

  217. #   define AV_WL16(p, v) AV_WL(16, p, v)

  218. #endif

  219. 

  220. #ifndef AV_RB32

  221. #   define AV_RB32(p)    AV_RB(32, p)

  222. #endif

  223. #ifndef AV_WB32

  224. #   define AV_WB32(p, v) AV_WB(32, p, v)

  225. #endif

  226. 

  227. #ifndef AV_RL32

  228. #   define AV_RL32(p)    AV_RL(32, p)

  229. #endif

  230. #ifndef AV_WL32

  231. #   define AV_WL32(p, v) AV_WL(32, p, v)

  232. #endif

  233. 

  234. #ifndef AV_RB64

  235. #   define AV_RB64(p)    AV_RB(64, p)

  236. #endif

  237. #ifndef AV_WB64

  238. #   define AV_WB64(p, v) AV_WB(64, p, v)

  239. #endif

  240. 

  241. #ifndef AV_RL64

  242. #   define AV_RL64(p)    AV_RL(64, p)

  243. #endif

  244. #ifndef AV_WL64

  245. #   define AV_WL64(p, v) AV_WL(64, p, v)

  246. #endif

  247. 

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

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

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

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

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

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

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

  255. 

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

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

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

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

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

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

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

  263. 

  264. #endif /* AVUTIL_INTREADWRITE_H */