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 "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_AVR32
  35 #   include "avr32/intreadwrite.h"
  36 #elif ARCH_MIPS
  37 #   include "mips/intreadwrite.h"
  38 #elif ARCH_PPC
  39 #   include "ppc/intreadwrite.h"
  40 #endif
  41
  42 /*
  43  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
  44  */
  45
  46 #if HAVE_BIGENDIAN
  47
  48 #   if    defined(AV_RN16) && !defined(AV_RB16)
  49 #       define AV_RB16(p) AV_RN16(p)
  50 #   elif !defined(AV_RN16) &&  defined(AV_RB16)
  51 #       define AV_RN16(p) AV_RB16(p)
  52 #   endif
  53
  54 #   if    defined(AV_WN16) && !defined(AV_WB16)
  55 #       define AV_WB16(p, v) AV_WN16(p, v)
  56 #   elif !defined(AV_WN16) &&  defined(AV_WB16)
  57 #       define AV_WN16(p, v) AV_WB16(p, v)
  58 #   endif
  59
  60 #   if    defined(AV_RN24) && !defined(AV_RB24)
  61 #       define AV_RB24(p) AV_RN24(p)
  62 #   elif !defined(AV_RN24) &&  defined(AV_RB24)
  63 #       define AV_RN24(p) AV_RB24(p)
  64 #   endif
  65
  66 #   if    defined(AV_WN24) && !defined(AV_WB24)
  67 #       define AV_WB24(p, v) AV_WN24(p, v)
  68 #   elif !defined(AV_WN24) &&  defined(AV_WB24)
  69 #       define AV_WN24(p, v) AV_WB24(p, v)
  70 #   endif
  71
  72 #   if    defined(AV_RN32) && !defined(AV_RB32)
  73 #       define AV_RB32(p) AV_RN32(p)
  74 #   elif !defined(AV_RN32) &&  defined(AV_RB32)
  75 #       define AV_RN32(p) AV_RB32(p)
  76 #   endif
  77
  78 #   if    defined(AV_WN32) && !defined(AV_WB32)
  79 #       define AV_WB32(p, v) AV_WN32(p, v)
  80 #   elif !defined(AV_WN32) &&  defined(AV_WB32)
  81 #       define AV_WN32(p, v) AV_WB32(p, v)
  82 #   endif
  83
  84 #   if    defined(AV_RN64) && !defined(AV_RB64)
  85 #       define AV_RB64(p) AV_RN64(p)
  86 #   elif !defined(AV_RN64) &&  defined(AV_RB64)
  87 #       define AV_RN64(p) AV_RB64(p)
  88 #   endif
  89
  90 #   if    defined(AV_WN64) && !defined(AV_WB64)
  91 #       define AV_WB64(p, v) AV_WN64(p, v)
  92 #   elif !defined(AV_WN64) &&  defined(AV_WB64)
  93 #       define AV_WN64(p, v) AV_WB64(p, v)
  94 #   endif
  95
  96 #else /* HAVE_BIGENDIAN */
  97
  98 #   if    defined(AV_RN16) && !defined(AV_RL16)
  99 #       define AV_RL16(p) AV_RN16(p)
 100 #   elif !defined(AV_RN16) &&  defined(AV_RL16)
 101 #       define AV_RN16(p) AV_RL16(p)
 102 #   endif
 103
 104 #   if    defined(AV_WN16) && !defined(AV_WL16)
 105 #       define AV_WL16(p, v) AV_WN16(p, v)
 106 #   elif !defined(AV_WN16) &&  defined(AV_WL16)
 107 #       define AV_WN16(p, v) AV_WL16(p, v)
 108 #   endif
 109
 110 #   if    defined(AV_RN24) && !defined(AV_RL24)
 111 #       define AV_RL24(p) AV_RN24(p)
 112 #   elif !defined(AV_RN24) &&  defined(AV_RL24)
 113 #       define AV_RN24(p) AV_RL24(p)
 114 #   endif
 115
 116 #   if    defined(AV_WN24) && !defined(AV_WL24)
 117 #       define AV_WL24(p, v) AV_WN24(p, v)
 118 #   elif !defined(AV_WN24) &&  defined(AV_WL24)
 119 #       define AV_WN24(p, v) AV_WL24(p, v)
 120 #   endif
 121
 122 #   if    defined(AV_RN32) && !defined(AV_RL32)
 123 #       define AV_RL32(p) AV_RN32(p)
 124 #   elif !defined(AV_RN32) &&  defined(AV_RL32)
 125 #       define AV_RN32(p) AV_RL32(p)
 126 #   endif
 127
 128 #   if    defined(AV_WN32) && !defined(AV_WL32)
 129 #       define AV_WL32(p, v) AV_WN32(p, v)
 130 #   elif !defined(AV_WN32) &&  defined(AV_WL32)
 131 #       define AV_WN32(p, v) AV_WL32(p, v)
 132 #   endif
 133
 134 #   if    defined(AV_RN64) && !defined(AV_RL64)
 135 #       define AV_RL64(p) AV_RN64(p)
 136 #   elif !defined(AV_RN64) &&  defined(AV_RL64)
 137 #       define AV_RN64(p) AV_RL64(p)
 138 #   endif
 139
 140 #   if    defined(AV_WN64) && !defined(AV_WL64)
 141 #       define AV_WL64(p, v) AV_WN64(p, v)
 142 #   elif !defined(AV_WN64) &&  defined(AV_WL64)
 143 #       define AV_WN64(p, v) AV_WL64(p, v)
 144 #   endif
 145
 146 #endif /* !HAVE_BIGENDIAN */
 147
 148 /*
 149  * Define AV_[RW]N helper macros to simplify definitions not provided
 150  * by per-arch headers.
 151  */
 152
 153 #if   HAVE_ATTRIBUTE_PACKED
 154
 155 struct unaligned_64 { uint64_t l; } __attribute__((packed));
 156 struct unaligned_32 { uint32_t l; } __attribute__((packed));
 157 struct unaligned_16 { uint16_t l; } __attribute__((packed));
 158
 159 #   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)
 160 #   define AV_WN(s, p, v) (((struct unaligned_##s *) (p))->l) = (v)
 161
 162 #elif defined(__DECC)
 163
 164 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
 165 #   define AV_WN(s, p, v) *((__unaligned uint##s##_t*)(p)) = (v)
 166
 167 #elif HAVE_FAST_UNALIGNED
 168
 169 #   define AV_RN(s, p) (*((const uint##s##_t*)(p)))
 170 #   define AV_WN(s, p, v) *((uint##s##_t*)(p)) = (v)
 171
 172 #else
 173
 174 #ifndef AV_RB16
 175 #   define AV_RB16(x)                           \
 176     ((((const uint8_t*)(x))[0] << 8) |          \
 177       ((const uint8_t*)(x))[1])
 178 #endif
 179 #ifndef AV_WB16
 180 #   define AV_WB16(p, d) do {                   \
 181         ((uint8_t*)(p))[1] = (d);               \
 182         ((uint8_t*)(p))[0] = (d)>>8;            \
 183     } while(0)
 184 #endif
 185
 186 #ifndef AV_RL16
 187 #   define AV_RL16(x)                           \
 188     ((((const uint8_t*)(x))[1] << 8) |          \
 189       ((const uint8_t*)(x))[0])
 190 #endif
 191 #ifndef AV_WL16
 192 #   define AV_WL16(p, d) do {                   \
 193         ((uint8_t*)(p))[0] = (d);               \
 194         ((uint8_t*)(p))[1] = (d)>>8;            \
 195     } while(0)
 196 #endif
 197
 198 #ifndef AV_RB32
 199 #   define AV_RB32(x)                           \
 200     ((((const uint8_t*)(x))[0] << 24) |         \
 201      (((const uint8_t*)(x))[1] << 16) |         \
 202      (((const uint8_t*)(x))[2] <<  8) |         \
 203       ((const uint8_t*)(x))[3])
 204 #endif
 205 #ifndef AV_WB32
 206 #   define AV_WB32(p, d) do {                   \
 207         ((uint8_t*)(p))[3] = (d);               \
 208         ((uint8_t*)(p))[2] = (d)>>8;            \
 209         ((uint8_t*)(p))[1] = (d)>>16;           \
 210         ((uint8_t*)(p))[0] = (d)>>24;           \
 211     } while(0)
 212 #endif
 213
 214 #ifndef AV_RL32
 215 #   define AV_RL32(x)                           \
 216     ((((const uint8_t*)(x))[3] << 24) |         \
 217      (((const uint8_t*)(x))[2] << 16) |         \
 218      (((const uint8_t*)(x))[1] <<  8) |         \
 219       ((const uint8_t*)(x))[0])
 220 #endif
 221 #ifndef AV_WL32
 222 #   define AV_WL32(p, d) do {                   \
 223         ((uint8_t*)(p))[0] = (d);               \
 224         ((uint8_t*)(p))[1] = (d)>>8;            \
 225         ((uint8_t*)(p))[2] = (d)>>16;           \
 226         ((uint8_t*)(p))[3] = (d)>>24;           \
 227     } while(0)
 228 #endif
 229
 230 #ifndef AV_RB64
 231 #   define AV_RB64(x)                                   \
 232     (((uint64_t)((const uint8_t*)(x))[0] << 56) |       \
 233      ((uint64_t)((const uint8_t*)(x))[1] << 48) |       \
 234      ((uint64_t)((const uint8_t*)(x))[2] << 40) |       \
 235      ((uint64_t)((const uint8_t*)(x))[3] << 32) |       \
 236      ((uint64_t)((const uint8_t*)(x))[4] << 24) |       \
 237      ((uint64_t)((const uint8_t*)(x))[5] << 16) |       \
 238      ((uint64_t)((const uint8_t*)(x))[6] <<  8) |       \
 239       (uint64_t)((const uint8_t*)(x))[7])
 240 #endif
 241 #ifndef AV_WB64
 242 #   define AV_WB64(p, d) do {                   \
 243         ((uint8_t*)(p))[7] = (d);               \
 244         ((uint8_t*)(p))[6] = (d)>>8;            \
 245         ((uint8_t*)(p))[5] = (d)>>16;           \
 246         ((uint8_t*)(p))[4] = (d)>>24;           \
 247         ((uint8_t*)(p))[3] = (d)>>32;           \
 248         ((uint8_t*)(p))[2] = (d)>>40;           \
 249         ((uint8_t*)(p))[1] = (d)>>48;           \
 250         ((uint8_t*)(p))[0] = (d)>>56;           \
 251     } while(0)
 252 #endif
 253
 254 #ifndef AV_RL64
 255 #   define AV_RL64(x)                                   \
 256     (((uint64_t)((const uint8_t*)(x))[7] << 56) |       \
 257      ((uint64_t)((const uint8_t*)(x))[6] << 48) |       \
 258      ((uint64_t)((const uint8_t*)(x))[5] << 40) |       \
 259      ((uint64_t)((const uint8_t*)(x))[4] << 32) |       \
 260      ((uint64_t)((const uint8_t*)(x))[3] << 24) |       \
 261      ((uint64_t)((const uint8_t*)(x))[2] << 16) |       \
 262      ((uint64_t)((const uint8_t*)(x))[1] <<  8) |       \
 263       (uint64_t)((const uint8_t*)(x))[0])
 264 #endif
 265 #ifndef AV_WL64
 266 #   define AV_WL64(p, d) do {                   \
 267         ((uint8_t*)(p))[0] = (d);               \
 268         ((uint8_t*)(p))[1] = (d)>>8;            \
 269         ((uint8_t*)(p))[2] = (d)>>16;           \
 270         ((uint8_t*)(p))[3] = (d)>>24;           \
 271         ((uint8_t*)(p))[4] = (d)>>32;           \
 272         ((uint8_t*)(p))[5] = (d)>>40;           \
 273         ((uint8_t*)(p))[6] = (d)>>48;           \
 274         ((uint8_t*)(p))[7] = (d)>>56;           \
 275     } while(0)
 276 #endif
 277
 278 #if HAVE_BIGENDIAN
 279 #   define AV_RN(s, p)    AV_RB##s(p)
 280 #   define AV_WN(s, p, v) AV_WB##s(p, v)
 281 #else
 282 #   define AV_RN(s, p)    AV_RL##s(p)
 283 #   define AV_WN(s, p, v) AV_WL##s(p, v)
 284 #endif
 285
 286 #endif /* HAVE_FAST_UNALIGNED */
 287
 288 #ifndef AV_RN16
 289 #   define AV_RN16(p) AV_RN(16, p)
 290 #endif
 291
 292 #ifndef AV_RN32
 293 #   define AV_RN32(p) AV_RN(32, p)
 294 #endif
 295
 296 #ifndef AV_RN64
 297 #   define AV_RN64(p) AV_RN(64, p)
 298 #endif
 299
 300 #ifndef AV_WN16
 301 #   define AV_WN16(p, v) AV_WN(16, p, v)
 302 #endif
 303
 304 #ifndef AV_WN32
 305 #   define AV_WN32(p, v) AV_WN(32, p, v)
 306 #endif
 307
 308 #ifndef AV_WN64
 309 #   define AV_WN64(p, v) AV_WN(64, p, v)
 310 #endif
 311
 312 #if HAVE_BIGENDIAN
 313 #   define AV_RB(s, p)    AV_RN##s(p)
 314 #   define AV_WB(s, p, v) AV_WN##s(p, v)
 315 #   define AV_RL(s, p)    bswap_##s(AV_RN##s(p))
 316 #   define AV_WL(s, p, v) AV_WN##s(p, bswap_##s(v))
 317 #else
 318 #   define AV_RB(s, p)    bswap_##s(AV_RN##s(p))
 319 #   define AV_WB(s, p, v) AV_WN##s(p, bswap_##s(v))
 320 #   define AV_RL(s, p)    AV_RN##s(p)
 321 #   define AV_WL(s, p, v) AV_WN##s(p, v)
 322 #endif
 323
 324 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
 325 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
 326
 327 #define AV_RL8(x)     AV_RB8(x)
 328 #define AV_WL8(p, d)  AV_WB8(p, d)
 329
 330 #ifndef AV_RB16
 331 #   define AV_RB16(p)    AV_RB(16, p)
 332 #endif
 333 #ifndef AV_WB16
 334 #   define AV_WB16(p, v) AV_WB(16, p, v)
 335 #endif
 336
 337 #ifndef AV_RL16
 338 #   define AV_RL16(p)    AV_RL(16, p)
 339 #endif
 340 #ifndef AV_WL16
 341 #   define AV_WL16(p, v) AV_WL(16, p, v)
 342 #endif
 343
 344 #ifndef AV_RB32
 345 #   define AV_RB32(p)    AV_RB(32, p)
 346 #endif
 347 #ifndef AV_WB32
 348 #   define AV_WB32(p, v) AV_WB(32, p, v)
 349 #endif
 350
 351 #ifndef AV_RL32
 352 #   define AV_RL32(p)    AV_RL(32, p)
 353 #endif
 354 #ifndef AV_WL32
 355 #   define AV_WL32(p, v) AV_WL(32, p, v)
 356 #endif
 357
 358 #ifndef AV_RB64
 359 #   define AV_RB64(p)    AV_RB(64, p)
 360 #endif
 361 #ifndef AV_WB64
 362 #   define AV_WB64(p, v) AV_WB(64, p, v)
 363 #endif
 364
 365 #ifndef AV_RL64
 366 #   define AV_RL64(p)    AV_RL(64, p)
 367 #endif
 368 #ifndef AV_WL64
 369 #   define AV_WL64(p, v) AV_WL(64, p, v)
 370 #endif
 371
 372 #ifndef AV_RB24
 373 #   define AV_RB24(x)                           \
 374     ((((const uint8_t*)(x))[0] << 16) |         \
 375      (((const uint8_t*)(x))[1] <<  8) |         \
 376       ((const uint8_t*)(x))[2])
 377 #endif
 378 #ifndef AV_WB24
 379 #   define AV_WB24(p, d) do {                   \
 380         ((uint8_t*)(p))[2] = (d);               \
 381         ((uint8_t*)(p))[1] = (d)>>8;            \
 382         ((uint8_t*)(p))[0] = (d)>>16;           \
 383     } while(0)
 384 #endif
 385
 386 #ifndef AV_RL24
 387 #   define AV_RL24(x)                           \
 388     ((((const uint8_t*)(x))[2] << 16) |         \
 389      (((const uint8_t*)(x))[1] <<  8) |         \
 390       ((const uint8_t*)(x))[0])
 391 #endif
 392 #ifndef AV_WL24
 393 #   define AV_WL24(p, d) do {                   \
 394         ((uint8_t*)(p))[0] = (d);               \
 395         ((uint8_t*)(p))[1] = (d)>>8;            \
 396         ((uint8_t*)(p))[2] = (d)>>16;           \
 397     } while(0)
 398 #endif
 399
 400 #endif /* AVUTIL_INTREADWRITE_H */