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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. #include "common.h"

  26. 

  27. typedef union {

  28.     uint64_t u64;

  29.     uint32_t u32[2];

  30.     uint16_t u16[4];

  31.     uint8_t  u8 [8];

  32.     double   f64;

  33.     float    f32[2];

  34. } av_alias av_alias64;

  35. 

  36. typedef union {

  37.     uint32_t u32;

  38.     uint16_t u16[2];

  39.     uint8_t  u8 [4];

  40.     float    f32;

  41. } av_alias av_alias32;

  42. 

  43. typedef union {

  44.     uint16_t u16;

  45.     uint8_t  u8 [2];

  46. } av_alias av_alias16;

  47. 

  48. /*

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

  50.  * AV_[RW][BLN](16|24|32|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.

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

  52.  * as inline functions.

  53.  */

  54. 

  55. #if   ARCH_ARM

  56. #   include "arm/intreadwrite.h"

  57. #elif ARCH_AVR32

  58. #   include "avr32/intreadwrite.h"

  59. #elif ARCH_MIPS

  60. #   include "mips/intreadwrite.h"

  61. #elif ARCH_PPC

  62. #   include "ppc/intreadwrite.h"

  63. #elif ARCH_X86

  64. #   include "x86/intreadwrite.h"

  65. #endif

  66. 

  67. /*

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

  69.  */

  70. 

  71. #if HAVE_BIGENDIAN

  72. 

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

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

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

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

  77. #   endif

  78. 

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

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

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

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

  83. #   endif

  84. 

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

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

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

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

  89. #   endif

  90. 

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

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

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

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

  95. #   endif

  96. 

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

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

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

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

  101. #   endif

  102. 

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

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

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

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

  107. #   endif

  108. 

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

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

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

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

  113. #   endif

  114. 

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

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

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

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

  119. #   endif

  120. 

  121. #else /* HAVE_BIGENDIAN */

  122. 

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

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

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

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

  127. #   endif

  128. 

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

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

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

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

  133. #   endif

  134. 

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

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

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

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

  139. #   endif

  140. 

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

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

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

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

  145. #   endif

  146. 

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

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

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

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

  151. #   endif

  152. 

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

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

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

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

  157. #   endif

  158. 

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

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

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

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

  163. #   endif

  164. 

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

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

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

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

  169. #   endif

  170. 

  171. #endif /* !HAVE_BIGENDIAN */

  172. 

  173. /*

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

  175.  * by per-arch headers.

  176.  */

  177. 

  178. #if   HAVE_ATTRIBUTE_PACKED

  179. 

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

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

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

  183. 

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

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

  186. 

  187. #elif defined(__DECC)

  188. 

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

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

  191. 

  192. #elif HAVE_FAST_UNALIGNED

  193. 

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

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

  196. 

  197. #else

  198. 

  199. #ifndef AV_RB16

  200. #   define AV_RB16(x)                           \

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

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

  203. #endif

  204. #ifndef AV_WB16

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

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

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

  208.     } while(0)

  209. #endif

  210. 

  211. #ifndef AV_RL16

  212. #   define AV_RL16(x)                           \

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

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

  215. #endif

  216. #ifndef AV_WL16

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

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

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

  220.     } while(0)

  221. #endif

  222. 

  223. #ifndef AV_RB32

  224. #   define AV_RB32(x)                           \

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

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

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

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

  229. #endif

  230. #ifndef AV_WB32

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

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

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

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

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

  236.     } while(0)

  237. #endif

  238. 

  239. #ifndef AV_RL32

  240. #   define AV_RL32(x)                           \

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

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

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

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

  245. #endif

  246. #ifndef AV_WL32

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

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

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

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

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

  252.     } while(0)

  253. #endif

  254. 

  255. #ifndef AV_RB64

  256. #   define AV_RB64(x)                                   \

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

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

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

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

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

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

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

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

  265. #endif

  266. #ifndef AV_WB64

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

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

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

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

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

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

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

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

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

  276.     } while(0)

  277. #endif

  278. 

  279. #ifndef AV_RL64

  280. #   define AV_RL64(x)                                   \

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

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

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

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

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

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

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

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

  289. #endif

  290. #ifndef AV_WL64

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

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

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

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

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

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

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

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

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

  300.     } while(0)

  301. #endif

  302. 

  303. #if HAVE_BIGENDIAN

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

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

  306. #else

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

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

  309. #endif

  310. 

  311. #endif /* HAVE_FAST_UNALIGNED */

  312. 

  313. #ifndef AV_RN16

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

  315. #endif

  316. 

  317. #ifndef AV_RN32

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

  319. #endif

  320. 

  321. #ifndef AV_RN64

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

  323. #endif

  324. 

  325. #ifndef AV_WN16

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

  327. #endif

  328. 

  329. #ifndef AV_WN32

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

  331. #endif

  332. 

  333. #ifndef AV_WN64

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

  335. #endif

  336. 

  337. #if HAVE_BIGENDIAN

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

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

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

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

  342. #else

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

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

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

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

  347. #endif

  348. 

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

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

  351. 

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

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

  354. 

  355. #ifndef AV_RB16

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

  357. #endif

  358. #ifndef AV_WB16

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

  360. #endif

  361. 

  362. #ifndef AV_RL16

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

  364. #endif

  365. #ifndef AV_WL16

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

  367. #endif

  368. 

  369. #ifndef AV_RB32

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

  371. #endif

  372. #ifndef AV_WB32

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

  374. #endif

  375. 

  376. #ifndef AV_RL32

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

  378. #endif

  379. #ifndef AV_WL32

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

  381. #endif

  382. 

  383. #ifndef AV_RB64

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

  385. #endif

  386. #ifndef AV_WB64

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

  388. #endif

  389. 

  390. #ifndef AV_RL64

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

  392. #endif

  393. #ifndef AV_WL64

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

  395. #endif

  396. 

  397. #ifndef AV_RB24

  398. #   define AV_RB24(x)                           \

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

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

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

  402. #endif

  403. #ifndef AV_WB24

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

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

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

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

  408.     } while(0)

  409. #endif

  410. 

  411. #ifndef AV_RL24

  412. #   define AV_RL24(x)                           \

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

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

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

  416. #endif

  417. #ifndef AV_WL24

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

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

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

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

  422.     } while(0)

  423. #endif

  424. 

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

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

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

  428.  * afterwards.

  429.  */

  430. 

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

  432. 

  433. #ifndef AV_COPY32

  434. #   define AV_COPY32(d, s) AV_COPY(32, d, s)

  435. #endif

  436. 

  437. #ifndef AV_COPY64

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

  439. #endif

  440. 

  441. #ifndef AV_COPY128

  442. #   define AV_COPY128(d, s)                    \

  443.     do {                                       \

  444.         AV_COPY64(d, s);                       \

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

  446.     } while(0)

  447. #endif

  448. 

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

  450. 

  451. #ifndef AV_SWAP64

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

  453. #endif

  454. 

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

  456. 

  457. #ifndef AV_ZERO64

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

  459. #endif

  460. 

  461. #ifndef AV_ZERO128

  462. #   define AV_ZERO128(d)         \

  463.     do {                         \

  464.         AV_ZERO64(d);            \

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

  466.     } while(0)

  467. #endif

  468. 

  469. #endif /* AVUTIL_INTREADWRITE_H */