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|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_PPC
  35 #   include "ppc/intreadwrite.h"
  36 #endif
  37
  38 /*
  39  * Define AV_[RW]N helper macros to simplify definitions not provided
  40  * by per-arch headers.
  41  */
  42
  43 #if   defined(__GNUC__)
  44
  45 struct unaligned_64 { uint64_t l; } __attribute__((packed));
  46 struct unaligned_32 { uint32_t l; } __attribute__((packed));
  47 struct unaligned_16 { uint16_t l; } __attribute__((packed));
  48
  49 #   define AV_RN(s, p) (((const struct unaligned_##s *) (p))->l)
  50 #   define AV_WN(s, p, v) (((struct unaligned_##s *) (p))->l) = (v)
  51
  52 #elif defined(__DECC)
  53
  54 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
  55 #   define AV_WN(s, p, v) *((__unaligned uint##s##_t*)(p)) = (v)
  56
  57 #elif HAVE_FAST_UNALIGNED
  58
  59 #   define AV_RN(s, p) (*((const uint##s##_t*)(p)))
  60 #   define AV_WN(s, p, v) *((uint##s##_t*)(p)) = (v)
  61
  62 #else
  63
  64 #ifndef AV_RB16
  65 #define AV_RB16(x)  ((((const uint8_t*)(x))[0] << 8) | \
  66                       ((const uint8_t*)(x))[1])
  67 #endif
  68 #ifndef AV_WB16
  69 #define AV_WB16(p, d) do { \
  70                     ((uint8_t*)(p))[1] = (d); \
  71                     ((uint8_t*)(p))[0] = (d)>>8; } while(0)
  72 #endif
  73
  74 #ifndef AV_RL16
  75 #define AV_RL16(x)  ((((const uint8_t*)(x))[1] << 8) | \
  76                       ((const uint8_t*)(x))[0])
  77 #endif
  78 #ifndef AV_WL16
  79 #define AV_WL16(p, d) do { \
  80                     ((uint8_t*)(p))[0] = (d); \
  81                     ((uint8_t*)(p))[1] = (d)>>8; } while(0)
  82 #endif
  83
  84 #ifndef AV_RB32
  85 #define AV_RB32(x)  ((((const uint8_t*)(x))[0] << 24) | \
  86                      (((const uint8_t*)(x))[1] << 16) | \
  87                      (((const uint8_t*)(x))[2] <<  8) | \
  88                       ((const uint8_t*)(x))[3])
  89 #endif
  90 #ifndef AV_WB32
  91 #define AV_WB32(p, d) do { \
  92                     ((uint8_t*)(p))[3] = (d); \
  93                     ((uint8_t*)(p))[2] = (d)>>8; \
  94                     ((uint8_t*)(p))[1] = (d)>>16; \
  95                     ((uint8_t*)(p))[0] = (d)>>24; } while(0)
  96 #endif
  97
  98 #ifndef AV_RL32
  99 #define AV_RL32(x) ((((const uint8_t*)(x))[3] << 24) | \
 100                     (((const uint8_t*)(x))[2] << 16) | \
 101                     (((const uint8_t*)(x))[1] <<  8) | \
 102                      ((const uint8_t*)(x))[0])
 103 #endif
 104 #ifndef AV_WL32
 105 #define AV_WL32(p, d) do { \
 106                     ((uint8_t*)(p))[0] = (d); \
 107                     ((uint8_t*)(p))[1] = (d)>>8; \
 108                     ((uint8_t*)(p))[2] = (d)>>16; \
 109                     ((uint8_t*)(p))[3] = (d)>>24; } while(0)
 110 #endif
 111
 112 #ifndef AV_RB64
 113 #define AV_RB64(x)  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
 114                      ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
 115                      ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
 116                      ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
 117                      ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
 118                      ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
 119                      ((uint64_t)((const uint8_t*)(x))[6] <<  8) | \
 120                       (uint64_t)((const uint8_t*)(x))[7])
 121 #endif
 122 #ifndef AV_WB64
 123 #define AV_WB64(p, d) do { \
 124                     ((uint8_t*)(p))[7] = (d);     \
 125                     ((uint8_t*)(p))[6] = (d)>>8;  \
 126                     ((uint8_t*)(p))[5] = (d)>>16; \
 127                     ((uint8_t*)(p))[4] = (d)>>24; \
 128                     ((uint8_t*)(p))[3] = (d)>>32; \
 129                     ((uint8_t*)(p))[2] = (d)>>40; \
 130                     ((uint8_t*)(p))[1] = (d)>>48; \
 131                     ((uint8_t*)(p))[0] = (d)>>56; } while(0)
 132 #endif
 133
 134 #ifndef AV_RL64
 135 #define AV_RL64(x)  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
 136                      ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
 137                      ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
 138                      ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
 139                      ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
 140                      ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
 141                      ((uint64_t)((const uint8_t*)(x))[1] <<  8) | \
 142                       (uint64_t)((const uint8_t*)(x))[0])
 143 #endif
 144 #ifndef AV_WL64
 145 #define AV_WL64(p, d) do { \
 146                     ((uint8_t*)(p))[0] = (d);     \
 147                     ((uint8_t*)(p))[1] = (d)>>8;  \
 148                     ((uint8_t*)(p))[2] = (d)>>16; \
 149                     ((uint8_t*)(p))[3] = (d)>>24; \
 150                     ((uint8_t*)(p))[4] = (d)>>32; \
 151                     ((uint8_t*)(p))[5] = (d)>>40; \
 152                     ((uint8_t*)(p))[6] = (d)>>48; \
 153                     ((uint8_t*)(p))[7] = (d)>>56; } while(0)
 154 #endif
 155
 156 #ifdef WORDS_BIGENDIAN
 157 #   define AV_RN(s, p)    AV_RB##s(p)
 158 #   define AV_WN(s, p, v) AV_WB##s(p, v)
 159 #else
 160 #   define AV_RN(s, p)    AV_RL##s(p)
 161 #   define AV_WN(s, p, v) AV_WL##s(p, v)
 162 #endif
 163
 164 #endif /* HAVE_FAST_UNALIGNED */
 165
 166 #ifndef AV_RN16
 167 #   define AV_RN16(p) AV_RN(16, p)
 168 #endif
 169
 170 #ifndef AV_RN32
 171 #   define AV_RN32(p) AV_RN(32, p)
 172 #endif
 173
 174 #ifndef AV_RN64
 175 #   define AV_RN64(p) AV_RN(64, p)
 176 #endif
 177
 178 #ifndef AV_WN16
 179 #   define AV_WN16(p, v) AV_WN(16, p, v)
 180 #endif
 181
 182 #ifndef AV_WN32
 183 #   define AV_WN32(p, v) AV_WN(32, p, v)
 184 #endif
 185
 186 #ifndef AV_WN64
 187 #   define AV_WN64(p, v) AV_WN(64, p, v)
 188 #endif
 189
 190 #ifdef WORDS_BIGENDIAN
 191 #   define AV_RB(s, p)    AV_RN(s, p)
 192 #   define AV_WB(s, p, v) AV_WN(s, p, v)
 193 #   define AV_RL(s, p)    bswap_##s(AV_RN(s, p))
 194 #   define AV_WL(s, p, v) AV_WN(s, p, bswap_##s(v))
 195 #else
 196 #   define AV_RB(s, p)    bswap_##s(AV_RN(s, p))
 197 #   define AV_WB(s, p, v) AV_WN(s, p, bswap_##s(v))
 198 #   define AV_RL(s, p)    AV_RN(s, p)
 199 #   define AV_WL(s, p, v) AV_WN(s, p, v)
 200 #endif
 201
 202 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
 203 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
 204
 205 #define AV_RL8(x)     AV_RB8(x)
 206 #define AV_WL8(p, d)  AV_WB8(p, d)
 207
 208 #ifndef AV_RB16
 209 #   define AV_RB16(p)    AV_RB(16, p)
 210 #endif
 211 #ifndef AV_WB16
 212 #   define AV_WB16(p, v) AV_WB(16, p, v)
 213 #endif
 214
 215 #ifndef AV_RL16
 216 #   define AV_RL16(p)    AV_RL(16, p)
 217 #endif
 218 #ifndef AV_WL16
 219 #   define AV_WL16(p, v) AV_WL(16, p, v)
 220 #endif
 221
 222 #ifndef AV_RB32
 223 #   define AV_RB32(p)    AV_RB(32, p)
 224 #endif
 225 #ifndef AV_WB32
 226 #   define AV_WB32(p, v) AV_WB(32, p, v)
 227 #endif
 228
 229 #ifndef AV_RL32
 230 #   define AV_RL32(p)    AV_RL(32, p)
 231 #endif
 232 #ifndef AV_WL32
 233 #   define AV_WL32(p, v) AV_WL(32, p, v)
 234 #endif
 235
 236 #ifndef AV_RB64
 237 #   define AV_RB64(p)    AV_RB(64, p)
 238 #endif
 239 #ifndef AV_WB64
 240 #   define AV_WB64(p, v) AV_WB(64, p, v)
 241 #endif
 242
 243 #ifndef AV_RL64
 244 #   define AV_RL64(p)    AV_RL(64, p)
 245 #endif
 246 #ifndef AV_WL64
 247 #   define AV_WL64(p, v) AV_WL(64, p, v)
 248 #endif
 249
 250 #define AV_RB24(x)  ((((const uint8_t*)(x))[0] << 16) | \
 251                      (((const uint8_t*)(x))[1] <<  8) | \
 252                       ((const uint8_t*)(x))[2])
 253 #define AV_WB24(p, d) do { \
 254                     ((uint8_t*)(p))[2] = (d); \
 255                     ((uint8_t*)(p))[1] = (d)>>8; \
 256                     ((uint8_t*)(p))[0] = (d)>>16; } while(0)
 257
 258 #define AV_RL24(x)  ((((const uint8_t*)(x))[2] << 16) | \
 259                      (((const uint8_t*)(x))[1] <<  8) | \
 260                       ((const uint8_t*)(x))[0])
 261 #define AV_WL24(p, d) do { \
 262                     ((uint8_t*)(p))[0] = (d); \
 263                     ((uint8_t*)(p))[1] = (d)>>8; \
 264                     ((uint8_t*)(p))[2] = (d)>>16; } while(0)
 265
 266 #endif /* AVUTIL_INTREADWRITE_H */