ffmpeg/libavutil/intreadwrite.h

   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 "libavutil/avconfig.h"
  24 #include "attributes.h"
  25 #include "bswap.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|48|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  * R/W means read/write, B/L/N means big/little/native endianness.
  55  * The following macros require aligned access, compared to their
  56  * unaligned variants: AV_(COPY|SWAP|ZERO)(64|128), AV_[RW]N[8-64]A.
  57  * Incorrect usage may range from abysmal performance to crash
  58  * depending on the platform.
  59  *
  60  * The unaligned variants are AV_[RW][BLN][8-64] and AV_COPY*U.
  61  */
  62
  63 #ifdef HAVE_AV_CONFIG_H
  64
  65 #include "config.h"
  66
  67 #if   ARCH_ARM
  68 #   include "arm/intreadwrite.h"
  69 #elif ARCH_AVR32
  70 #   include "avr32/intreadwrite.h"
  71 #elif ARCH_MIPS
  72 #   include "mips/intreadwrite.h"
  73 #elif ARCH_PPC
  74 #   include "ppc/intreadwrite.h"
  75 #elif ARCH_TOMI
  76 #   include "tomi/intreadwrite.h"
  77 #elif ARCH_X86
  78 #   include "x86/intreadwrite.h"
  79 #endif
  80
  81 #endif /* HAVE_AV_CONFIG_H */
  82
  83 /*
  84  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
  85  */
  86
  87 #if AV_HAVE_BIGENDIAN
  88
  89 #   if    defined(AV_RN16) && !defined(AV_RB16)
  90 #       define AV_RB16(p) AV_RN16(p)
  91 #   elif !defined(AV_RN16) &&  defined(AV_RB16)
  92 #       define AV_RN16(p) AV_RB16(p)
  93 #   endif
  94
  95 #   if    defined(AV_WN16) && !defined(AV_WB16)
  96 #       define AV_WB16(p, v) AV_WN16(p, v)
  97 #   elif !defined(AV_WN16) &&  defined(AV_WB16)
  98 #       define AV_WN16(p, v) AV_WB16(p, v)
  99 #   endif
 100
 101 #   if    defined(AV_RN24) && !defined(AV_RB24)
 102 #       define AV_RB24(p) AV_RN24(p)
 103 #   elif !defined(AV_RN24) &&  defined(AV_RB24)
 104 #       define AV_RN24(p) AV_RB24(p)
 105 #   endif
 106
 107 #   if    defined(AV_WN24) && !defined(AV_WB24)
 108 #       define AV_WB24(p, v) AV_WN24(p, v)
 109 #   elif !defined(AV_WN24) &&  defined(AV_WB24)
 110 #       define AV_WN24(p, v) AV_WB24(p, v)
 111 #   endif
 112
 113 #   if    defined(AV_RN32) && !defined(AV_RB32)
 114 #       define AV_RB32(p) AV_RN32(p)
 115 #   elif !defined(AV_RN32) &&  defined(AV_RB32)
 116 #       define AV_RN32(p) AV_RB32(p)
 117 #   endif
 118
 119 #   if    defined(AV_WN32) && !defined(AV_WB32)
 120 #       define AV_WB32(p, v) AV_WN32(p, v)
 121 #   elif !defined(AV_WN32) &&  defined(AV_WB32)
 122 #       define AV_WN32(p, v) AV_WB32(p, v)
 123 #   endif
 124
 125 #   if    defined(AV_RN48) && !defined(AV_RB48)
 126 #       define AV_RB48(p) AV_RN48(p)
 127 #   elif !defined(AV_RN48) &&  defined(AV_RB48)
 128 #       define AV_RN48(p) AV_RB48(p)
 129 #   endif
 130
 131 #   if    defined(AV_WN48) && !defined(AV_WB48)
 132 #       define AV_WB48(p, v) AV_WN48(p, v)
 133 #   elif !defined(AV_WN48) &&  defined(AV_WB48)
 134 #       define AV_WN48(p, v) AV_WB48(p, v)
 135 #   endif
 136
 137 #   if    defined(AV_RN64) && !defined(AV_RB64)
 138 #       define AV_RB64(p) AV_RN64(p)
 139 #   elif !defined(AV_RN64) &&  defined(AV_RB64)
 140 #       define AV_RN64(p) AV_RB64(p)
 141 #   endif
 142
 143 #   if    defined(AV_WN64) && !defined(AV_WB64)
 144 #       define AV_WB64(p, v) AV_WN64(p, v)
 145 #   elif !defined(AV_WN64) &&  defined(AV_WB64)
 146 #       define AV_WN64(p, v) AV_WB64(p, v)
 147 #   endif
 148
 149 #else /* AV_HAVE_BIGENDIAN */
 150
 151 #   if    defined(AV_RN16) && !defined(AV_RL16)
 152 #       define AV_RL16(p) AV_RN16(p)
 153 #   elif !defined(AV_RN16) &&  defined(AV_RL16)
 154 #       define AV_RN16(p) AV_RL16(p)
 155 #   endif
 156
 157 #   if    defined(AV_WN16) && !defined(AV_WL16)
 158 #       define AV_WL16(p, v) AV_WN16(p, v)
 159 #   elif !defined(AV_WN16) &&  defined(AV_WL16)
 160 #       define AV_WN16(p, v) AV_WL16(p, v)
 161 #   endif
 162
 163 #   if    defined(AV_RN24) && !defined(AV_RL24)
 164 #       define AV_RL24(p) AV_RN24(p)
 165 #   elif !defined(AV_RN24) &&  defined(AV_RL24)
 166 #       define AV_RN24(p) AV_RL24(p)
 167 #   endif
 168
 169 #   if    defined(AV_WN24) && !defined(AV_WL24)
 170 #       define AV_WL24(p, v) AV_WN24(p, v)
 171 #   elif !defined(AV_WN24) &&  defined(AV_WL24)
 172 #       define AV_WN24(p, v) AV_WL24(p, v)
 173 #   endif
 174
 175 #   if    defined(AV_RN32) && !defined(AV_RL32)
 176 #       define AV_RL32(p) AV_RN32(p)
 177 #   elif !defined(AV_RN32) &&  defined(AV_RL32)
 178 #       define AV_RN32(p) AV_RL32(p)
 179 #   endif
 180
 181 #   if    defined(AV_WN32) && !defined(AV_WL32)
 182 #       define AV_WL32(p, v) AV_WN32(p, v)
 183 #   elif !defined(AV_WN32) &&  defined(AV_WL32)
 184 #       define AV_WN32(p, v) AV_WL32(p, v)
 185 #   endif
 186
 187 #   if    defined(AV_RN48) && !defined(AV_RL48)
 188 #       define AV_RL48(p) AV_RN48(p)
 189 #   elif !defined(AV_RN48) &&  defined(AV_RL48)
 190 #       define AV_RN48(p) AV_RL48(p)
 191 #   endif
 192
 193 #   if    defined(AV_WN48) && !defined(AV_WL48)
 194 #       define AV_WL48(p, v) AV_WN48(p, v)
 195 #   elif !defined(AV_WN48) &&  defined(AV_WL48)
 196 #       define AV_WN48(p, v) AV_WL48(p, v)
 197 #   endif
 198
 199 #   if    defined(AV_RN64) && !defined(AV_RL64)
 200 #       define AV_RL64(p) AV_RN64(p)
 201 #   elif !defined(AV_RN64) &&  defined(AV_RL64)
 202 #       define AV_RN64(p) AV_RL64(p)
 203 #   endif
 204
 205 #   if    defined(AV_WN64) && !defined(AV_WL64)
 206 #       define AV_WL64(p, v) AV_WN64(p, v)
 207 #   elif !defined(AV_WN64) &&  defined(AV_WL64)
 208 #       define AV_WN64(p, v) AV_WL64(p, v)
 209 #   endif
 210
 211 #endif /* !AV_HAVE_BIGENDIAN */
 212
 213 /*
 214  * Define AV_[RW]N helper macros to simplify definitions not provided
 215  * by per-arch headers.
 216  */
 217
 218 #if defined(__GNUC__) && !defined(__TI_COMPILER_VERSION__)
 219
 220 union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
 221 union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
 222 union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
 223
 224 #   define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
 225 #   define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))
 226
 227 #elif defined(__DECC)
 228
 229 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
 230 #   define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))
 231
 232 #elif AV_HAVE_FAST_UNALIGNED
 233
 234 #   define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
 235 #   define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))
 236
 237 #else
 238
 239 #ifndef AV_RB16
 240 #   define AV_RB16(x)                           \
 241     ((((const uint8_t*)(x))[0] << 8) |          \
 242       ((const uint8_t*)(x))[1])
 243 #endif
 244 #ifndef AV_WB16
 245 #   define AV_WB16(p, darg) do {                \
 246         unsigned d = (darg);                    \
 247         ((uint8_t*)(p))[1] = (d);               \
 248         ((uint8_t*)(p))[0] = (d)>>8;            \
 249     } while(0)
 250 #endif
 251
 252 #ifndef AV_RL16
 253 #   define AV_RL16(x)                           \
 254     ((((const uint8_t*)(x))[1] << 8) |          \
 255       ((const uint8_t*)(x))[0])
 256 #endif
 257 #ifndef AV_WL16
 258 #   define AV_WL16(p, darg) do {                \
 259         unsigned d = (darg);                    \
 260         ((uint8_t*)(p))[0] = (d);               \
 261         ((uint8_t*)(p))[1] = (d)>>8;            \
 262     } while(0)
 263 #endif
 264
 265 #ifndef AV_RB32
 266 #   define AV_RB32(x)                                \
 267     (((uint32_t)((const uint8_t*)(x))[0] << 24) |    \
 268                (((const uint8_t*)(x))[1] << 16) |    \
 269                (((const uint8_t*)(x))[2] <<  8) |    \
 270                 ((const uint8_t*)(x))[3])
 271 #endif
 272 #ifndef AV_WB32
 273 #   define AV_WB32(p, darg) do {                \
 274         unsigned d = (darg);                    \
 275         ((uint8_t*)(p))[3] = (d);               \
 276         ((uint8_t*)(p))[2] = (d)>>8;            \
 277         ((uint8_t*)(p))[1] = (d)>>16;           \
 278         ((uint8_t*)(p))[0] = (d)>>24;           \
 279     } while(0)
 280 #endif
 281
 282 #ifndef AV_RL32
 283 #   define AV_RL32(x)                                \
 284     (((uint32_t)((const uint8_t*)(x))[3] << 24) |    \
 285                (((const uint8_t*)(x))[2] << 16) |    \
 286                (((const uint8_t*)(x))[1] <<  8) |    \
 287                 ((const uint8_t*)(x))[0])
 288 #endif
 289 #ifndef AV_WL32
 290 #   define AV_WL32(p, darg) do {                \
 291         unsigned d = (darg);                    \
 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     } while(0)
 297 #endif
 298
 299 #ifndef AV_RB64
 300 #   define AV_RB64(x)                                   \
 301     (((uint64_t)((const uint8_t*)(x))[0] << 56) |       \
 302      ((uint64_t)((const uint8_t*)(x))[1] << 48) |       \
 303      ((uint64_t)((const uint8_t*)(x))[2] << 40) |       \
 304      ((uint64_t)((const uint8_t*)(x))[3] << 32) |       \
 305      ((uint64_t)((const uint8_t*)(x))[4] << 24) |       \
 306      ((uint64_t)((const uint8_t*)(x))[5] << 16) |       \
 307      ((uint64_t)((const uint8_t*)(x))[6] <<  8) |       \
 308       (uint64_t)((const uint8_t*)(x))[7])
 309 #endif
 310 #ifndef AV_WB64
 311 #   define AV_WB64(p, darg) do {                \
 312         uint64_t d = (darg);                    \
 313         ((uint8_t*)(p))[7] = (d);               \
 314         ((uint8_t*)(p))[6] = (d)>>8;            \
 315         ((uint8_t*)(p))[5] = (d)>>16;           \
 316         ((uint8_t*)(p))[4] = (d)>>24;           \
 317         ((uint8_t*)(p))[3] = (d)>>32;           \
 318         ((uint8_t*)(p))[2] = (d)>>40;           \
 319         ((uint8_t*)(p))[1] = (d)>>48;           \
 320         ((uint8_t*)(p))[0] = (d)>>56;           \
 321     } while(0)
 322 #endif
 323
 324 #ifndef AV_RL64
 325 #   define AV_RL64(x)                                   \
 326     (((uint64_t)((const uint8_t*)(x))[7] << 56) |       \
 327      ((uint64_t)((const uint8_t*)(x))[6] << 48) |       \
 328      ((uint64_t)((const uint8_t*)(x))[5] << 40) |       \
 329      ((uint64_t)((const uint8_t*)(x))[4] << 32) |       \
 330      ((uint64_t)((const uint8_t*)(x))[3] << 24) |       \
 331      ((uint64_t)((const uint8_t*)(x))[2] << 16) |       \
 332      ((uint64_t)((const uint8_t*)(x))[1] <<  8) |       \
 333       (uint64_t)((const uint8_t*)(x))[0])
 334 #endif
 335 #ifndef AV_WL64
 336 #   define AV_WL64(p, darg) do {                \
 337         uint64_t d = (darg);                    \
 338         ((uint8_t*)(p))[0] = (d);               \
 339         ((uint8_t*)(p))[1] = (d)>>8;            \
 340         ((uint8_t*)(p))[2] = (d)>>16;           \
 341         ((uint8_t*)(p))[3] = (d)>>24;           \
 342         ((uint8_t*)(p))[4] = (d)>>32;           \
 343         ((uint8_t*)(p))[5] = (d)>>40;           \
 344         ((uint8_t*)(p))[6] = (d)>>48;           \
 345         ((uint8_t*)(p))[7] = (d)>>56;           \
 346     } while(0)
 347 #endif
 348
 349 #if AV_HAVE_BIGENDIAN
 350 #   define AV_RN(s, p)    AV_RB##s(p)
 351 #   define AV_WN(s, p, v) AV_WB##s(p, v)
 352 #else
 353 #   define AV_RN(s, p)    AV_RL##s(p)
 354 #   define AV_WN(s, p, v) AV_WL##s(p, v)
 355 #endif
 356
 357 #endif /* HAVE_FAST_UNALIGNED */
 358
 359 #ifndef AV_RN16
 360 #   define AV_RN16(p) AV_RN(16, p)
 361 #endif
 362
 363 #ifndef AV_RN32
 364 #   define AV_RN32(p) AV_RN(32, p)
 365 #endif
 366
 367 #ifndef AV_RN64
 368 #   define AV_RN64(p) AV_RN(64, p)
 369 #endif
 370
 371 #ifndef AV_WN16
 372 #   define AV_WN16(p, v) AV_WN(16, p, v)
 373 #endif
 374
 375 #ifndef AV_WN32
 376 #   define AV_WN32(p, v) AV_WN(32, p, v)
 377 #endif
 378
 379 #ifndef AV_WN64
 380 #   define AV_WN64(p, v) AV_WN(64, p, v)
 381 #endif
 382
 383 #if AV_HAVE_BIGENDIAN
 384 #   define AV_RB(s, p)    AV_RN##s(p)
 385 #   define AV_WB(s, p, v) AV_WN##s(p, v)
 386 #   define AV_RL(s, p)    av_bswap##s(AV_RN##s(p))
 387 #   define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v))
 388 #else
 389 #   define AV_RB(s, p)    av_bswap##s(AV_RN##s(p))
 390 #   define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v))
 391 #   define AV_RL(s, p)    AV_RN##s(p)
 392 #   define AV_WL(s, p, v) AV_WN##s(p, v)
 393 #endif
 394
 395 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
 396 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
 397
 398 #define AV_RL8(x)     AV_RB8(x)
 399 #define AV_WL8(p, d)  AV_WB8(p, d)
 400
 401 #ifndef AV_RB16
 402 #   define AV_RB16(p)    AV_RB(16, p)
 403 #endif
 404 #ifndef AV_WB16
 405 #   define AV_WB16(p, v) AV_WB(16, p, v)
 406 #endif
 407
 408 #ifndef AV_RL16
 409 #   define AV_RL16(p)    AV_RL(16, p)
 410 #endif
 411 #ifndef AV_WL16
 412 #   define AV_WL16(p, v) AV_WL(16, p, v)
 413 #endif
 414
 415 #ifndef AV_RB32
 416 #   define AV_RB32(p)    AV_RB(32, p)
 417 #endif
 418 #ifndef AV_WB32
 419 #   define AV_WB32(p, v) AV_WB(32, p, v)
 420 #endif
 421
 422 #ifndef AV_RL32
 423 #   define AV_RL32(p)    AV_RL(32, p)
 424 #endif
 425 #ifndef AV_WL32
 426 #   define AV_WL32(p, v) AV_WL(32, p, v)
 427 #endif
 428
 429 #ifndef AV_RB64
 430 #   define AV_RB64(p)    AV_RB(64, p)
 431 #endif
 432 #ifndef AV_WB64
 433 #   define AV_WB64(p, v) AV_WB(64, p, v)
 434 #endif
 435
 436 #ifndef AV_RL64
 437 #   define AV_RL64(p)    AV_RL(64, p)
 438 #endif
 439 #ifndef AV_WL64
 440 #   define AV_WL64(p, v) AV_WL(64, p, v)
 441 #endif
 442
 443 #ifndef AV_RB24
 444 #   define AV_RB24(x)                           \
 445     ((((const uint8_t*)(x))[0] << 16) |         \
 446      (((const uint8_t*)(x))[1] <<  8) |         \
 447       ((const uint8_t*)(x))[2])
 448 #endif
 449 #ifndef AV_WB24
 450 #   define AV_WB24(p, d) do {                   \
 451         ((uint8_t*)(p))[2] = (d);               \
 452         ((uint8_t*)(p))[1] = (d)>>8;            \
 453         ((uint8_t*)(p))[0] = (d)>>16;           \
 454     } while(0)
 455 #endif
 456
 457 #ifndef AV_RL24
 458 #   define AV_RL24(x)                           \
 459     ((((const uint8_t*)(x))[2] << 16) |         \
 460      (((const uint8_t*)(x))[1] <<  8) |         \
 461       ((const uint8_t*)(x))[0])
 462 #endif
 463 #ifndef AV_WL24
 464 #   define AV_WL24(p, d) do {                   \
 465         ((uint8_t*)(p))[0] = (d);               \
 466         ((uint8_t*)(p))[1] = (d)>>8;            \
 467         ((uint8_t*)(p))[2] = (d)>>16;           \
 468     } while(0)
 469 #endif
 470
 471 #ifndef AV_RB48
 472 #   define AV_RB48(x)                                     \
 473     (((uint64_t)((const uint8_t*)(x))[0] << 40) |         \
 474      ((uint64_t)((const uint8_t*)(x))[1] << 32) |         \
 475      ((uint64_t)((const uint8_t*)(x))[2] << 24) |         \
 476      ((uint64_t)((const uint8_t*)(x))[3] << 16) |         \
 477      ((uint64_t)((const uint8_t*)(x))[4] <<  8) |         \
 478       (uint64_t)((const uint8_t*)(x))[5])
 479 #endif
 480 #ifndef AV_WB48
 481 #   define AV_WB48(p, darg) do {                \
 482         uint64_t d = (darg);                    \
 483         ((uint8_t*)(p))[5] = (d);               \
 484         ((uint8_t*)(p))[4] = (d)>>8;            \
 485         ((uint8_t*)(p))[3] = (d)>>16;           \
 486         ((uint8_t*)(p))[2] = (d)>>24;           \
 487         ((uint8_t*)(p))[1] = (d)>>32;           \
 488         ((uint8_t*)(p))[0] = (d)>>40;           \
 489     } while(0)
 490 #endif
 491
 492 #ifndef AV_RL48
 493 #   define AV_RL48(x)                                     \
 494     (((uint64_t)((const uint8_t*)(x))[5] << 40) |         \
 495      ((uint64_t)((const uint8_t*)(x))[4] << 32) |         \
 496      ((uint64_t)((const uint8_t*)(x))[3] << 24) |         \
 497      ((uint64_t)((const uint8_t*)(x))[2] << 16) |         \
 498      ((uint64_t)((const uint8_t*)(x))[1] <<  8) |         \
 499       (uint64_t)((const uint8_t*)(x))[0])
 500 #endif
 501 #ifndef AV_WL48
 502 #   define AV_WL48(p, darg) do {                \
 503         uint64_t d = (darg);                    \
 504         ((uint8_t*)(p))[0] = (d);               \
 505         ((uint8_t*)(p))[1] = (d)>>8;            \
 506         ((uint8_t*)(p))[2] = (d)>>16;           \
 507         ((uint8_t*)(p))[3] = (d)>>24;           \
 508         ((uint8_t*)(p))[4] = (d)>>32;           \
 509         ((uint8_t*)(p))[5] = (d)>>40;           \
 510     } while(0)
 511 #endif
 512
 513 /*
 514  * The AV_[RW]NA macros access naturally aligned data
 515  * in a type-safe way.
 516  */
 517
 518 #define AV_RNA(s, p)    (((const av_alias##s*)(p))->u##s)
 519 #define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))
 520
 521 #ifndef AV_RN16A
 522 #   define AV_RN16A(p) AV_RNA(16, p)
 523 #endif
 524
 525 #ifndef AV_RN32A
 526 #   define AV_RN32A(p) AV_RNA(32, p)
 527 #endif
 528
 529 #ifndef AV_RN64A
 530 #   define AV_RN64A(p) AV_RNA(64, p)
 531 #endif
 532
 533 #ifndef AV_WN16A
 534 #   define AV_WN16A(p, v) AV_WNA(16, p, v)
 535 #endif
 536
 537 #ifndef AV_WN32A
 538 #   define AV_WN32A(p, v) AV_WNA(32, p, v)
 539 #endif
 540
 541 #ifndef AV_WN64A
 542 #   define AV_WN64A(p, v) AV_WNA(64, p, v)
 543 #endif
 544
 545 /*
 546  * The AV_COPYxxU macros are suitable for copying data to/from unaligned
 547  * memory locations.
 548  */
 549
 550 #define AV_COPYU(n, d, s) AV_WN##n(d, AV_RN##n(s));
 551
 552 #ifndef AV_COPY16U
 553 #   define AV_COPY16U(d, s) AV_COPYU(16, d, s)
 554 #endif
 555
 556 #ifndef AV_COPY32U
 557 #   define AV_COPY32U(d, s) AV_COPYU(32, d, s)
 558 #endif
 559
 560 #ifndef AV_COPY64U
 561 #   define AV_COPY64U(d, s) AV_COPYU(64, d, s)
 562 #endif
 563
 564 #ifndef AV_COPY128U
 565 #   define AV_COPY128U(d, s)                                    \
 566     do {                                                        \
 567         AV_COPY64U(d, s);                                       \
 568         AV_COPY64U((char *)(d) + 8, (const char *)(s) + 8);     \
 569     } while(0)
 570 #endif
 571
 572 /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
 573  * naturally aligned. They may be implemented using MMX,
 574  * so emms_c() must be called before using any float code
 575  * afterwards.
 576  */
 577
 578 #define AV_COPY(n, d, s) \
 579     (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)
 580
 581 #ifndef AV_COPY16
 582 #   define AV_COPY16(d, s) AV_COPY(16, d, s)
 583 #endif
 584
 585 #ifndef AV_COPY32
 586 #   define AV_COPY32(d, s) AV_COPY(32, d, s)
 587 #endif
 588
 589 #ifndef AV_COPY64
 590 #   define AV_COPY64(d, s) AV_COPY(64, d, s)
 591 #endif
 592
 593 #ifndef AV_COPY128
 594 #   define AV_COPY128(d, s)                    \
 595     do {                                       \
 596         AV_COPY64(d, s);                       \
 597         AV_COPY64((char*)(d)+8, (char*)(s)+8); \
 598     } while(0)
 599 #endif
 600
 601 #define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))
 602
 603 #ifndef AV_SWAP64
 604 #   define AV_SWAP64(a, b) AV_SWAP(64, a, b)
 605 #endif
 606
 607 #define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)
 608
 609 #ifndef AV_ZERO16
 610 #   define AV_ZERO16(d) AV_ZERO(16, d)
 611 #endif
 612
 613 #ifndef AV_ZERO32
 614 #   define AV_ZERO32(d) AV_ZERO(32, d)
 615 #endif
 616
 617 #ifndef AV_ZERO64
 618 #   define AV_ZERO64(d) AV_ZERO(64, d)
 619 #endif
 620
 621 #ifndef AV_ZERO128
 622 #   define AV_ZERO128(d)         \
 623     do {                         \
 624         AV_ZERO64(d);            \
 625         AV_ZERO64((char*)(d)+8); \
 626     } while(0)
 627 #endif
 628
 629 #endif /* AVUTIL_INTREADWRITE_H */