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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|24|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. #elif ARCH_MIPS

  35. #   include "mips/intreadwrite.h"

  36. #elif ARCH_PPC

  37. #   include "ppc/intreadwrite.h"

  38. #endif

  39. 

  40. /*

  41.  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.

  42.  */

  43. 

  44. #if HAVE_BIGENDIAN

  45. 

  46. #   if    defined(AV_RN16) && !defined(AV_RB16)

  47. #       define AV_RB16(p) AV_RN16(p)

  48. #   elif !defined(AV_RN16) &&  defined(AV_RB16)

  49. #       define AV_RN16(p) AV_RB16(p)

  50. #   endif

  51. 

  52. #   if    defined(AV_WN16) && !defined(AV_WB16)

  53. #       define AV_WB16(p, v) AV_WN16(p, v)

  54. #   elif !defined(AV_WN16) &&  defined(AV_WB16)

  55. #       define AV_WN16(p, v) AV_WB16(p, v)

  56. #   endif

  57. 

  58. #   if    defined(AV_RN32) && !defined(AV_RB32)

  59. #       define AV_RB32(p) AV_RN32(p)

  60. #   elif !defined(AV_RN32) &&  defined(AV_RB32)

  61. #       define AV_RN32(p) AV_RB32(p)

  62. #   endif

  63. 

  64. #   if    defined(AV_RN24) && !defined(AV_RB24)

  65. #       define AV_RB24(p) AV_RN24(p)

  66. #   elif !defined(AV_RN24) &&  defined(AV_RB24)

  67. #       define AV_RN24(p) AV_RB24(p)

  68. #   endif

  69. 

  70. #   if    defined(AV_WN24) && !defined(AV_WB24)

  71. #       define AV_WB24(p, v) AV_WN24(p, v)

  72. #   elif !defined(AV_WN24) &&  defined(AV_WB24)

  73. #       define AV_WN24(p, v) AV_WB24(p, v)

  74. #   endif

  75. 

  76. #   if    defined(AV_WN32) && !defined(AV_WB32)

  77. #       define AV_WB32(p, v) AV_WN32(p, v)

  78. #   elif !defined(AV_WN32) &&  defined(AV_WB32)

  79. #       define AV_WN32(p, v) AV_WB32(p, v)

  80. #   endif

  81. 

  82. #   if    defined(AV_RN64) && !defined(AV_RB64)

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

  84. #   elif !defined(AV_RN64) &&  defined(AV_RB64)

  85. #       define AV_RN64(p) AV_RB64(p)

  86. #   endif

  87. 

  88. #   if    defined(AV_WN64) && !defined(AV_WB64)

  89. #       define AV_WB64(p, v) AV_WN64(p, v)

  90. #   elif !defined(AV_WN64) &&  defined(AV_WB64)

  91. #       define AV_WN64(p, v) AV_WB64(p, v)

  92. #   endif

  93. 

  94. #else /* HAVE_BIGENDIAN */

  95. 

  96. #   if    defined(AV_RN16) && !defined(AV_RL16)

  97. #       define AV_RL16(p) AV_RN16(p)

  98. #   elif !defined(AV_RN16) &&  defined(AV_RL16)

  99. #       define AV_RN16(p) AV_RL16(p)

  100. #   endif

  101. 

  102. #   if    defined(AV_WN16) && !defined(AV_WL16)

  103. #       define AV_WL16(p, v) AV_WN16(p, v)

  104. #   elif !defined(AV_WN16) &&  defined(AV_WL16)

  105. #       define AV_WN16(p, v) AV_WL16(p, v)

  106. #   endif

  107. 

  108. #   if    defined(AV_RN32) && !defined(AV_RL32)

  109. #       define AV_RL32(p) AV_RN32(p)

  110. #   elif !defined(AV_RN32) &&  defined(AV_RL32)

  111. #       define AV_RN32(p) AV_RL32(p)

  112. #   endif

  113. 

  114. #   if    defined(AV_RN24) && !defined(AV_RL24)

  115. #       define AV_RL24(p) AV_RN24(p)

  116. #   elif !defined(AV_RN24) &&  defined(AV_RL24)

  117. #       define AV_RN24(p) AV_RL24(p)

  118. #   endif

  119. 

  120. #   if    defined(AV_WN24) && !defined(AV_WL24)

  121. #       define AV_WL24(p, v) AV_WN24(p, v)

  122. #   elif !defined(AV_WN24) &&  defined(AV_WL24)

  123. #       define AV_WN24(p, v) AV_WL24(p, v)

  124. #   endif

  125. 

  126. #   if    defined(AV_WN32) && !defined(AV_WL32)

  127. #       define AV_WL32(p, v) AV_WN32(p, v)

  128. #   elif !defined(AV_WN32) &&  defined(AV_WL32)

  129. #       define AV_WN32(p, v) AV_WL32(p, v)

  130. #   endif

  131. 

  132. #   if    defined(AV_RN64) && !defined(AV_RL64)

  133. #       define AV_RL64(p) AV_RN64(p)

  134. #   elif !defined(AV_RN64) &&  defined(AV_RL64)

  135. #       define AV_RN64(p) AV_RL64(p)

  136. #   endif

  137. 

  138. #   if    defined(AV_WN64) && !defined(AV_WL64)

  139. #       define AV_WL64(p, v) AV_WN64(p, v)

  140. #   elif !defined(AV_WN64) &&  defined(AV_WL64)

  141. #       define AV_WN64(p, v) AV_WL64(p, v)

  142. #   endif

  143. 

  144. #endif /* !HAVE_BIGENDIAN */

  145. 

  146. /*

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

  148.  * by per-arch headers.

  149.  */

  150. 

  151. #if   HAVE_ATTRIBUTE_PACKED

  152. 

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

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

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

  156. 

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

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

  159. 

  160. #elif defined(__DECC)

  161. 

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

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

  164. 

  165. #elif HAVE_FAST_UNALIGNED

  166. 

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

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

  169. 

  170. #else

  171. 

  172. #ifndef AV_RB16

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

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

  175. #endif

  176. #ifndef AV_WB16

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

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

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

  180. #endif

  181. 

  182. #ifndef AV_RL16

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

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

  185. #endif

  186. #ifndef AV_WL16

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

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

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

  190. #endif

  191. 

  192. #ifndef AV_RB32

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

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

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

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

  197. #endif

  198. #ifndef AV_WB32

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

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

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

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

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

  204. #endif

  205. 

  206. #ifndef AV_RL32

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

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

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

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

  211. #endif

  212. #ifndef AV_WL32

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

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

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

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

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

  218. #endif

  219. 

  220. #ifndef AV_RB64

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

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

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

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

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

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

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

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

  229. #endif

  230. #ifndef AV_WB64

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

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

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

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

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

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

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

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

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

  240. #endif

  241. 

  242. #ifndef AV_RL64

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

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

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

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

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

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

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

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

  251. #endif

  252. #ifndef AV_WL64

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

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

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

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

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

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

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

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

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

  262. #endif

  263. 

  264. #if HAVE_BIGENDIAN

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

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

  267. #else

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

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

  270. #endif

  271. 

  272. #endif /* HAVE_FAST_UNALIGNED */

  273. 

  274. #ifndef AV_RN16

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

  276. #endif

  277. 

  278. #ifndef AV_RN32

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

  280. #endif

  281. 

  282. #ifndef AV_RN64

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

  284. #endif

  285. 

  286. #ifndef AV_WN16

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

  288. #endif

  289. 

  290. #ifndef AV_WN32

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

  292. #endif

  293. 

  294. #ifndef AV_WN64

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

  296. #endif

  297. 

  298. #if HAVE_BIGENDIAN

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

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

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

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

  303. #else

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

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

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

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

  308. #endif

  309. 

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

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

  312. 

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

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

  315. 

  316. #ifndef AV_RB16

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

  318. #endif

  319. #ifndef AV_WB16

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

  321. #endif

  322. 

  323. #ifndef AV_RL16

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

  325. #endif

  326. #ifndef AV_WL16

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

  328. #endif

  329. 

  330. #ifndef AV_RB32

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

  332. #endif

  333. #ifndef AV_WB32

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

  335. #endif

  336. 

  337. #ifndef AV_RL32

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

  339. #endif

  340. #ifndef AV_WL32

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

  342. #endif

  343. 

  344. #ifndef AV_RB64

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

  346. #endif

  347. #ifndef AV_WB64

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

  349. #endif

  350. 

  351. #ifndef AV_RL64

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

  353. #endif

  354. #ifndef AV_WL64

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

  356. #endif

  357. 

  358. #ifndef AV_RB24

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

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

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

  362. #endif

  363. #ifndef AV_WB24

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

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

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

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

  368. #endif

  369. 

  370. #ifndef AV_RL24

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

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

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

  374. #endif

  375. #ifndef AV_WL24

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

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

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

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

  380. #endif

  381. 

  382. #endif /* AVUTIL_INTREADWRITE_H */