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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) and AV_(COPY|SWAP|ZERO)(64|128) macros.

  29.  * Preprocessor symbols must be defined, even if these are implemented

  30.  * as inline functions.

  31.  */

  32. 

  33. #if   ARCH_ARM

  34. #   include "arm/intreadwrite.h"

  35. #elif ARCH_AVR32

  36. #   include "avr32/intreadwrite.h"

  37. #elif ARCH_MIPS

  38. #   include "mips/intreadwrite.h"

  39. #elif ARCH_PPC

  40. #   include "ppc/intreadwrite.h"

  41. #elif ARCH_X86

  42. #   include "x86/intreadwrite.h"

  43. #endif

  44. 

  45. /*

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

  47.  */

  48. 

  49. #if HAVE_BIGENDIAN

  50. 

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

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

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

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

  55. #   endif

  56. 

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

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

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

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

  61. #   endif

  62. 

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

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

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

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

  67. #   endif

  68. 

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

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

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

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

  73. #   endif

  74. 

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

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

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

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

  79. #   endif

  80. 

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

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

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

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

  85. #   endif

  86. 

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

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

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

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

  91. #   endif

  92. 

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

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

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

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

  97. #   endif

  98. 

  99. #else /* HAVE_BIGENDIAN */

  100. 

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

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

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

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

  105. #   endif

  106. 

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

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

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

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

  111. #   endif

  112. 

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

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

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

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

  117. #   endif

  118. 

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

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

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

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

  123. #   endif

  124. 

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

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

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

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

  129. #   endif

  130. 

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

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

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

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

  135. #   endif

  136. 

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

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

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

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

  141. #   endif

  142. 

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

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

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

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

  147. #   endif

  148. 

  149. #endif /* !HAVE_BIGENDIAN */

  150. 

  151. /*

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

  153.  * by per-arch headers.

  154.  */

  155. 

  156. #if   HAVE_ATTRIBUTE_PACKED

  157. 

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

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

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

  161. 

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

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

  164. 

  165. #elif defined(__DECC)

  166. 

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

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

  169. 

  170. #elif HAVE_FAST_UNALIGNED

  171. 

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

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

  174. 

  175. #else

  176. 

  177. #ifndef AV_RB16

  178. #   define AV_RB16(x)                           \

  179.     ((((const uint8_t*)(x))[0] << 8) |          \

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

  181. #endif

  182. #ifndef AV_WB16

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

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

  185.         ((uint8_t*)(p))[0] = (d)>>8;            \

  186.     } while(0)

  187. #endif

  188. 

  189. #ifndef AV_RL16

  190. #   define AV_RL16(x)                           \

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

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

  193. #endif

  194. #ifndef AV_WL16

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

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

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

  198.     } while(0)

  199. #endif

  200. 

  201. #ifndef AV_RB32

  202. #   define AV_RB32(x)                           \

  203.     ((((const uint8_t*)(x))[0] << 24) |         \

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

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

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

  207. #endif

  208. #ifndef AV_WB32

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

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

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

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

  213.         ((uint8_t*)(p))[0] = (d)>>24;           \

  214.     } while(0)

  215. #endif

  216. 

  217. #ifndef AV_RL32

  218. #   define AV_RL32(x)                           \

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

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

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

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

  223. #endif

  224. #ifndef AV_WL32

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

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

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

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

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

  230.     } while(0)

  231. #endif

  232. 

  233. #ifndef AV_RB64

  234. #   define AV_RB64(x)                                   \

  235.     (((uint64_t)((const uint8_t*)(x))[0] << 56) |       \

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

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

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

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

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

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

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

  243. #endif

  244. #ifndef AV_WB64

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

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

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

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

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

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

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

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

  253.         ((uint8_t*)(p))[0] = (d)>>56;           \

  254.     } while(0)

  255. #endif

  256. 

  257. #ifndef AV_RL64

  258. #   define AV_RL64(x)                                   \

  259.     (((uint64_t)((const uint8_t*)(x))[7] << 56) |       \

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

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

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

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

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

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

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

  267. #endif

  268. #ifndef AV_WL64

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

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

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

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

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

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

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

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

  277.         ((uint8_t*)(p))[7] = (d)>>56;           \

  278.     } while(0)

  279. #endif

  280. 

  281. #if HAVE_BIGENDIAN

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

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

  284. #else

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

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

  287. #endif

  288. 

  289. #endif /* HAVE_FAST_UNALIGNED */

  290. 

  291. #ifndef AV_RN16

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

  293. #endif

  294. 

  295. #ifndef AV_RN32

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

  297. #endif

  298. 

  299. #ifndef AV_RN64

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

  301. #endif

  302. 

  303. #ifndef AV_WN16

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

  305. #endif

  306. 

  307. #ifndef AV_WN32

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

  309. #endif

  310. 

  311. #ifndef AV_WN64

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

  313. #endif

  314. 

  315. #if HAVE_BIGENDIAN

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

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

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

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

  320. #else

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

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

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

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

  325. #endif

  326. 

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

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

  329. 

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

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

  332. 

  333. #ifndef AV_RB16

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

  335. #endif

  336. #ifndef AV_WB16

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

  338. #endif

  339. 

  340. #ifndef AV_RL16

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

  342. #endif

  343. #ifndef AV_WL16

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

  345. #endif

  346. 

  347. #ifndef AV_RB32

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

  349. #endif

  350. #ifndef AV_WB32

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

  352. #endif

  353. 

  354. #ifndef AV_RL32

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

  356. #endif

  357. #ifndef AV_WL32

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

  359. #endif

  360. 

  361. #ifndef AV_RB64

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

  363. #endif

  364. #ifndef AV_WB64

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

  366. #endif

  367. 

  368. #ifndef AV_RL64

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

  370. #endif

  371. #ifndef AV_WL64

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

  373. #endif

  374. 

  375. #ifndef AV_RB24

  376. #   define AV_RB24(x)                           \

  377.     ((((const uint8_t*)(x))[0] << 16) |         \

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

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

  380. #endif

  381. #ifndef AV_WB24

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

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

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

  385.         ((uint8_t*)(p))[0] = (d)>>16;           \

  386.     } while(0)

  387. #endif

  388. 

  389. #ifndef AV_RL24

  390. #   define AV_RL24(x)                           \

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

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

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

  394. #endif

  395. #ifndef AV_WL24

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

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

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

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

  400.     } while(0)

  401. #endif

  402. 

  403. /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be

  404.  * naturally aligned. They may be implemented using MMX,

  405.  * so emms_c() must be called before using any float code

  406.  * afterwards.

  407.  */

  408. 

  409. #define AV_COPY(n, d, s) (*(uint##n##_t*)(d) = *(const uint##n##_t*)(s))

  410. 

  411. #ifndef AV_COPY64

  412. #   define AV_COPY64(d, s) AV_COPY(64, d, s)

  413. #endif

  414. 

  415. #ifndef AV_COPY128

  416. #   define AV_COPY128(d, s)                    \

  417.     do {                                       \

  418.         AV_COPY64(d, s);                       \

  419.         AV_COPY64((char*)(d)+8, (char*)(s)+8); \

  420.     } while(0)

  421. #endif

  422. 

  423. #define AV_SWAP(n, a, b) FFSWAP(uint##n##_t, *(uint##n##_t*)(a), *(uint##n##_t*)(b))

  424. 

  425. #ifndef AV_SWAP64

  426. #   define AV_SWAP64(a, b) AV_SWAP(64, a, b)

  427. #endif

  428. 

  429. #define AV_ZERO(n, d) (*(uint##n##_t*)(d) = 0)

  430. 

  431. #ifndef AV_ZERO64

  432. #   define AV_ZERO64(d) AV_ZERO(64, d)

  433. #endif

  434. 

  435. #ifndef AV_ZERO128

  436. #   define AV_ZERO128(d)         \

  437.     do {                         \

  438.         AV_ZERO64(d);            \

  439.         AV_ZERO64((char*)(d)+8); \

  440.     } while(0)

  441. #endif

  442. 

  443. #endif /* AVUTIL_INTREADWRITE_H */