FFmpeg: libavutil/intreadwrite.h Source File

00001 /*
00002  * This file is part of FFmpeg.
00003  *
00004  * FFmpeg is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU Lesser General Public
00006  * License as published by the Free Software Foundation; either
00007  * version 2.1 of the License, or (at your option) any later version.
00008  *
00009  * FFmpeg is distributed in the hope that it will be useful,
00010  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00011  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012  * Lesser General Public License for more details.
00013  *
00014  * You should have received a copy of the GNU Lesser General Public
00015  * License along with FFmpeg; if not, write to the Free Software
00016  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00017  */
00018 
00019 #ifndef AVUTIL_INTREADWRITE_H
00020 #define AVUTIL_INTREADWRITE_H
00021 
00022 #include <stdint.h>
00023 #include "libavutil/avconfig.h"
00024 #include "attributes.h"
00025 #include "bswap.h"
00026 
00027 typedef union {
00028     uint64_t u64;
00029     uint32_t u32[2];
00030     uint16_t u16[4];
00031     uint8_t  u8 [8];
00032     double   f64;
00033     float    f32[2];
00034 } av_alias av_alias64;
00035 
00036 typedef union {
00037     uint32_t u32;
00038     uint16_t u16[2];
00039     uint8_t  u8 [4];
00040     float    f32;
00041 } av_alias av_alias32;
00042 
00043 typedef union {
00044     uint16_t u16;
00045     uint8_t  u8 [2];
00046 } av_alias av_alias16;
00047 
00048 /*
00049  * Arch-specific headers can provide any combination of
00050  * AV_[RW][BLN](16|24|32|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.
00051  * Preprocessor symbols must be defined, even if these are implemented
00052  * as inline functions.
00053  */
00054 
00055 #ifdef HAVE_AV_CONFIG_H
00056 
00057 #include "config.h"
00058 
00059 #if   ARCH_ARM
00060 #   include "arm/intreadwrite.h"
00061 #elif ARCH_AVR32
00062 #   include "avr32/intreadwrite.h"
00063 #elif ARCH_MIPS
00064 #   include "mips/intreadwrite.h"
00065 #elif ARCH_PPC
00066 #   include "ppc/intreadwrite.h"
00067 #elif ARCH_TOMI
00068 #   include "tomi/intreadwrite.h"
00069 #elif ARCH_X86
00070 #   include "x86/intreadwrite.h"
00071 #endif
00072 
00073 #endif /* HAVE_AV_CONFIG_H */
00074 
00075 /*
00076  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
00077  */
00078 
00079 #if AV_HAVE_BIGENDIAN
00080 
00081 #   if    defined(AV_RN16) && !defined(AV_RB16)
00082 #       define AV_RB16(p) AV_RN16(p)
00083 #   elif !defined(AV_RN16) &&  defined(AV_RB16)
00084 #       define AV_RN16(p) AV_RB16(p)
00085 #   endif
00086 
00087 #   if    defined(AV_WN16) && !defined(AV_WB16)
00088 #       define AV_WB16(p, v) AV_WN16(p, v)
00089 #   elif !defined(AV_WN16) &&  defined(AV_WB16)
00090 #       define AV_WN16(p, v) AV_WB16(p, v)
00091 #   endif
00092 
00093 #   if    defined(AV_RN24) && !defined(AV_RB24)
00094 #       define AV_RB24(p) AV_RN24(p)
00095 #   elif !defined(AV_RN24) &&  defined(AV_RB24)
00096 #       define AV_RN24(p) AV_RB24(p)
00097 #   endif
00098 
00099 #   if    defined(AV_WN24) && !defined(AV_WB24)
00100 #       define AV_WB24(p, v) AV_WN24(p, v)
00101 #   elif !defined(AV_WN24) &&  defined(AV_WB24)
00102 #       define AV_WN24(p, v) AV_WB24(p, v)
00103 #   endif
00104 
00105 #   if    defined(AV_RN32) && !defined(AV_RB32)
00106 #       define AV_RB32(p) AV_RN32(p)
00107 #   elif !defined(AV_RN32) &&  defined(AV_RB32)
00108 #       define AV_RN32(p) AV_RB32(p)
00109 #   endif
00110 
00111 #   if    defined(AV_WN32) && !defined(AV_WB32)
00112 #       define AV_WB32(p, v) AV_WN32(p, v)
00113 #   elif !defined(AV_WN32) &&  defined(AV_WB32)
00114 #       define AV_WN32(p, v) AV_WB32(p, v)
00115 #   endif
00116 
00117 #   if    defined(AV_RN64) && !defined(AV_RB64)
00118 #       define AV_RB64(p) AV_RN64(p)
00119 #   elif !defined(AV_RN64) &&  defined(AV_RB64)
00120 #       define AV_RN64(p) AV_RB64(p)
00121 #   endif
00122 
00123 #   if    defined(AV_WN64) && !defined(AV_WB64)
00124 #       define AV_WB64(p, v) AV_WN64(p, v)
00125 #   elif !defined(AV_WN64) &&  defined(AV_WB64)
00126 #       define AV_WN64(p, v) AV_WB64(p, v)
00127 #   endif
00128 
00129 #else /* AV_HAVE_BIGENDIAN */
00130 
00131 #   if    defined(AV_RN16) && !defined(AV_RL16)
00132 #       define AV_RL16(p) AV_RN16(p)
00133 #   elif !defined(AV_RN16) &&  defined(AV_RL16)
00134 #       define AV_RN16(p) AV_RL16(p)
00135 #   endif
00136 
00137 #   if    defined(AV_WN16) && !defined(AV_WL16)
00138 #       define AV_WL16(p, v) AV_WN16(p, v)
00139 #   elif !defined(AV_WN16) &&  defined(AV_WL16)
00140 #       define AV_WN16(p, v) AV_WL16(p, v)
00141 #   endif
00142 
00143 #   if    defined(AV_RN24) && !defined(AV_RL24)
00144 #       define AV_RL24(p) AV_RN24(p)
00145 #   elif !defined(AV_RN24) &&  defined(AV_RL24)
00146 #       define AV_RN24(p) AV_RL24(p)
00147 #   endif
00148 
00149 #   if    defined(AV_WN24) && !defined(AV_WL24)
00150 #       define AV_WL24(p, v) AV_WN24(p, v)
00151 #   elif !defined(AV_WN24) &&  defined(AV_WL24)
00152 #       define AV_WN24(p, v) AV_WL24(p, v)
00153 #   endif
00154 
00155 #   if    defined(AV_RN32) && !defined(AV_RL32)
00156 #       define AV_RL32(p) AV_RN32(p)
00157 #   elif !defined(AV_RN32) &&  defined(AV_RL32)
00158 #       define AV_RN32(p) AV_RL32(p)
00159 #   endif
00160 
00161 #   if    defined(AV_WN32) && !defined(AV_WL32)
00162 #       define AV_WL32(p, v) AV_WN32(p, v)
00163 #   elif !defined(AV_WN32) &&  defined(AV_WL32)
00164 #       define AV_WN32(p, v) AV_WL32(p, v)
00165 #   endif
00166 
00167 #   if    defined(AV_RN64) && !defined(AV_RL64)
00168 #       define AV_RL64(p) AV_RN64(p)
00169 #   elif !defined(AV_RN64) &&  defined(AV_RL64)
00170 #       define AV_RN64(p) AV_RL64(p)
00171 #   endif
00172 
00173 #   if    defined(AV_WN64) && !defined(AV_WL64)
00174 #       define AV_WL64(p, v) AV_WN64(p, v)
00175 #   elif !defined(AV_WN64) &&  defined(AV_WL64)
00176 #       define AV_WN64(p, v) AV_WL64(p, v)
00177 #   endif
00178 
00179 #endif /* !AV_HAVE_BIGENDIAN */
00180 
00181 /*
00182  * Define AV_[RW]N helper macros to simplify definitions not provided
00183  * by per-arch headers.
00184  */
00185 
00186 #if defined(__GNUC__) && !defined(__TI_COMPILER_VERSION__)
00187 
00188 union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
00189 union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
00190 union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
00191 
00192 #   define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
00193 #   define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))
00194 
00195 #elif defined(__DECC)
00196 
00197 #   define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
00198 #   define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))
00199 
00200 #elif AV_HAVE_FAST_UNALIGNED
00201 
00202 #   define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
00203 #   define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))
00204 
00205 #else
00206 
00207 #ifndef AV_RB16
00208 #   define AV_RB16(x)                           \
00209     ((((const uint8_t*)(x))[0] << 8) |          \
00210       ((const uint8_t*)(x))[1])
00211 #endif
00212 #ifndef AV_WB16
00213 #   define AV_WB16(p, d) do {                   \
00214         ((uint8_t*)(p))[1] = (d);               \
00215         ((uint8_t*)(p))[0] = (d)>>8;            \
00216     } while(0)
00217 #endif
00218 
00219 #ifndef AV_RL16
00220 #   define AV_RL16(x)                           \
00221     ((((const uint8_t*)(x))[1] << 8) |          \
00222       ((const uint8_t*)(x))[0])
00223 #endif
00224 #ifndef AV_WL16
00225 #   define AV_WL16(p, d) do {                   \
00226         ((uint8_t*)(p))[0] = (d);               \
00227         ((uint8_t*)(p))[1] = (d)>>8;            \
00228     } while(0)
00229 #endif
00230 
00231 #ifndef AV_RB32
00232 #   define AV_RB32(x)                                \
00233     (((uint32_t)((const uint8_t*)(x))[0] << 24) |    \
00234                (((const uint8_t*)(x))[1] << 16) |    \
00235                (((const uint8_t*)(x))[2] <<  8) |    \
00236                 ((const uint8_t*)(x))[3])
00237 #endif
00238 #ifndef AV_WB32
00239 #   define AV_WB32(p, d) do {                   \
00240         ((uint8_t*)(p))[3] = (d);               \
00241         ((uint8_t*)(p))[2] = (d)>>8;            \
00242         ((uint8_t*)(p))[1] = (d)>>16;           \
00243         ((uint8_t*)(p))[0] = (d)>>24;           \
00244     } while(0)
00245 #endif
00246 
00247 #ifndef AV_RL32
00248 #   define AV_RL32(x)                                \
00249     (((uint32_t)((const uint8_t*)(x))[3] << 24) |    \
00250                (((const uint8_t*)(x))[2] << 16) |    \
00251                (((const uint8_t*)(x))[1] <<  8) |    \
00252                 ((const uint8_t*)(x))[0])
00253 #endif
00254 #ifndef AV_WL32
00255 #   define AV_WL32(p, d) do {                   \
00256         ((uint8_t*)(p))[0] = (d);               \
00257         ((uint8_t*)(p))[1] = (d)>>8;            \
00258         ((uint8_t*)(p))[2] = (d)>>16;           \
00259         ((uint8_t*)(p))[3] = (d)>>24;           \
00260     } while(0)
00261 #endif
00262 
00263 #ifndef AV_RB64
00264 #   define AV_RB64(x)                                   \
00265     (((uint64_t)((const uint8_t*)(x))[0] << 56) |       \
00266      ((uint64_t)((const uint8_t*)(x))[1] << 48) |       \
00267      ((uint64_t)((const uint8_t*)(x))[2] << 40) |       \
00268      ((uint64_t)((const uint8_t*)(x))[3] << 32) |       \
00269      ((uint64_t)((const uint8_t*)(x))[4] << 24) |       \
00270      ((uint64_t)((const uint8_t*)(x))[5] << 16) |       \
00271      ((uint64_t)((const uint8_t*)(x))[6] <<  8) |       \
00272       (uint64_t)((const uint8_t*)(x))[7])
00273 #endif
00274 #ifndef AV_WB64
00275 #   define AV_WB64(p, d) do {                   \
00276         ((uint8_t*)(p))[7] = (d);               \
00277         ((uint8_t*)(p))[6] = (d)>>8;            \
00278         ((uint8_t*)(p))[5] = (d)>>16;           \
00279         ((uint8_t*)(p))[4] = (d)>>24;           \
00280         ((uint8_t*)(p))[3] = (d)>>32;           \
00281         ((uint8_t*)(p))[2] = (d)>>40;           \
00282         ((uint8_t*)(p))[1] = (d)>>48;           \
00283         ((uint8_t*)(p))[0] = (d)>>56;           \
00284     } while(0)
00285 #endif
00286 
00287 #ifndef AV_RL64
00288 #   define AV_RL64(x)                                   \
00289     (((uint64_t)((const uint8_t*)(x))[7] << 56) |       \
00290      ((uint64_t)((const uint8_t*)(x))[6] << 48) |       \
00291      ((uint64_t)((const uint8_t*)(x))[5] << 40) |       \
00292      ((uint64_t)((const uint8_t*)(x))[4] << 32) |       \
00293      ((uint64_t)((const uint8_t*)(x))[3] << 24) |       \
00294      ((uint64_t)((const uint8_t*)(x))[2] << 16) |       \
00295      ((uint64_t)((const uint8_t*)(x))[1] <<  8) |       \
00296       (uint64_t)((const uint8_t*)(x))[0])
00297 #endif
00298 #ifndef AV_WL64
00299 #   define AV_WL64(p, d) do {                   \
00300         ((uint8_t*)(p))[0] = (d);               \
00301         ((uint8_t*)(p))[1] = (d)>>8;            \
00302         ((uint8_t*)(p))[2] = (d)>>16;           \
00303         ((uint8_t*)(p))[3] = (d)>>24;           \
00304         ((uint8_t*)(p))[4] = (d)>>32;           \
00305         ((uint8_t*)(p))[5] = (d)>>40;           \
00306         ((uint8_t*)(p))[6] = (d)>>48;           \
00307         ((uint8_t*)(p))[7] = (d)>>56;           \
00308     } while(0)
00309 #endif
00310 
00311 #if AV_HAVE_BIGENDIAN
00312 #   define AV_RN(s, p)    AV_RB##s(p)
00313 #   define AV_WN(s, p, v) AV_WB##s(p, v)
00314 #else
00315 #   define AV_RN(s, p)    AV_RL##s(p)
00316 #   define AV_WN(s, p, v) AV_WL##s(p, v)
00317 #endif
00318 
00319 #endif /* HAVE_FAST_UNALIGNED */
00320 
00321 #ifndef AV_RN16
00322 #   define AV_RN16(p) AV_RN(16, p)
00323 #endif
00324 
00325 #ifndef AV_RN32
00326 #   define AV_RN32(p) AV_RN(32, p)
00327 #endif
00328 
00329 #ifndef AV_RN64
00330 #   define AV_RN64(p) AV_RN(64, p)
00331 #endif
00332 
00333 #ifndef AV_WN16
00334 #   define AV_WN16(p, v) AV_WN(16, p, v)
00335 #endif
00336 
00337 #ifndef AV_WN32
00338 #   define AV_WN32(p, v) AV_WN(32, p, v)
00339 #endif
00340 
00341 #ifndef AV_WN64
00342 #   define AV_WN64(p, v) AV_WN(64, p, v)
00343 #endif
00344 
00345 #if AV_HAVE_BIGENDIAN
00346 #   define AV_RB(s, p)    AV_RN##s(p)
00347 #   define AV_WB(s, p, v) AV_WN##s(p, v)
00348 #   define AV_RL(s, p)    av_bswap##s(AV_RN##s(p))
00349 #   define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v))
00350 #else
00351 #   define AV_RB(s, p)    av_bswap##s(AV_RN##s(p))
00352 #   define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v))
00353 #   define AV_RL(s, p)    AV_RN##s(p)
00354 #   define AV_WL(s, p, v) AV_WN##s(p, v)
00355 #endif
00356 
00357 #define AV_RB8(x)     (((const uint8_t*)(x))[0])
00358 #define AV_WB8(p, d)  do { ((uint8_t*)(p))[0] = (d); } while(0)
00359 
00360 #define AV_RL8(x)     AV_RB8(x)
00361 #define AV_WL8(p, d)  AV_WB8(p, d)
00362 
00363 #ifndef AV_RB16
00364 #   define AV_RB16(p)    AV_RB(16, p)
00365 #endif
00366 #ifndef AV_WB16
00367 #   define AV_WB16(p, v) AV_WB(16, p, v)
00368 #endif
00369 
00370 #ifndef AV_RL16
00371 #   define AV_RL16(p)    AV_RL(16, p)
00372 #endif
00373 #ifndef AV_WL16
00374 #   define AV_WL16(p, v) AV_WL(16, p, v)
00375 #endif
00376 
00377 #ifndef AV_RB32
00378 #   define AV_RB32(p)    AV_RB(32, p)
00379 #endif
00380 #ifndef AV_WB32
00381 #   define AV_WB32(p, v) AV_WB(32, p, v)
00382 #endif
00383 
00384 #ifndef AV_RL32
00385 #   define AV_RL32(p)    AV_RL(32, p)
00386 #endif
00387 #ifndef AV_WL32
00388 #   define AV_WL32(p, v) AV_WL(32, p, v)
00389 #endif
00390 
00391 #ifndef AV_RB64
00392 #   define AV_RB64(p)    AV_RB(64, p)
00393 #endif
00394 #ifndef AV_WB64
00395 #   define AV_WB64(p, v) AV_WB(64, p, v)
00396 #endif
00397 
00398 #ifndef AV_RL64
00399 #   define AV_RL64(p)    AV_RL(64, p)
00400 #endif
00401 #ifndef AV_WL64
00402 #   define AV_WL64(p, v) AV_WL(64, p, v)
00403 #endif
00404 
00405 #ifndef AV_RB24
00406 #   define AV_RB24(x)                           \
00407     ((((const uint8_t*)(x))[0] << 16) |         \
00408      (((const uint8_t*)(x))[1] <<  8) |         \
00409       ((const uint8_t*)(x))[2])
00410 #endif
00411 #ifndef AV_WB24
00412 #   define AV_WB24(p, d) do {                   \
00413         ((uint8_t*)(p))[2] = (d);               \
00414         ((uint8_t*)(p))[1] = (d)>>8;            \
00415         ((uint8_t*)(p))[0] = (d)>>16;           \
00416     } while(0)
00417 #endif
00418 
00419 #ifndef AV_RL24
00420 #   define AV_RL24(x)                           \
00421     ((((const uint8_t*)(x))[2] << 16) |         \
00422      (((const uint8_t*)(x))[1] <<  8) |         \
00423       ((const uint8_t*)(x))[0])
00424 #endif
00425 #ifndef AV_WL24
00426 #   define AV_WL24(p, d) do {                   \
00427         ((uint8_t*)(p))[0] = (d);               \
00428         ((uint8_t*)(p))[1] = (d)>>8;            \
00429         ((uint8_t*)(p))[2] = (d)>>16;           \
00430     } while(0)
00431 #endif
00432 
00433 /*
00434  * The AV_[RW]NA macros access naturally aligned data
00435  * in a type-safe way.
00436  */
00437 
00438 #define AV_RNA(s, p)    (((const av_alias##s*)(p))->u##s)
00439 #define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))
00440 
00441 #ifndef AV_RN16A
00442 #   define AV_RN16A(p) AV_RNA(16, p)
00443 #endif
00444 
00445 #ifndef AV_RN32A
00446 #   define AV_RN32A(p) AV_RNA(32, p)
00447 #endif
00448 
00449 #ifndef AV_RN64A
00450 #   define AV_RN64A(p) AV_RNA(64, p)
00451 #endif
00452 
00453 #ifndef AV_WN16A
00454 #   define AV_WN16A(p, v) AV_WNA(16, p, v)
00455 #endif
00456 
00457 #ifndef AV_WN32A
00458 #   define AV_WN32A(p, v) AV_WNA(32, p, v)
00459 #endif
00460 
00461 #ifndef AV_WN64A
00462 #   define AV_WN64A(p, v) AV_WNA(64, p, v)
00463 #endif
00464 
00465 /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
00466  * naturally aligned. They may be implemented using MMX,
00467  * so emms_c() must be called before using any float code
00468  * afterwards.
00469  */
00470 
00471 #define AV_COPY(n, d, s) \
00472     (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)
00473 
00474 #ifndef AV_COPY16
00475 #   define AV_COPY16(d, s) AV_COPY(16, d, s)
00476 #endif
00477 
00478 #ifndef AV_COPY32
00479 #   define AV_COPY32(d, s) AV_COPY(32, d, s)
00480 #endif
00481 
00482 #ifndef AV_COPY64
00483 #   define AV_COPY64(d, s) AV_COPY(64, d, s)
00484 #endif
00485 
00486 #ifndef AV_COPY128
00487 #   define AV_COPY128(d, s)                    \
00488     do {                                       \
00489         AV_COPY64(d, s);                       \
00490         AV_COPY64((char*)(d)+8, (char*)(s)+8); \
00491     } while(0)
00492 #endif
00493 
00494 #define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))
00495 
00496 #ifndef AV_SWAP64
00497 #   define AV_SWAP64(a, b) AV_SWAP(64, a, b)
00498 #endif
00499 
00500 #define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)
00501 
00502 #ifndef AV_ZERO16
00503 #   define AV_ZERO16(d) AV_ZERO(16, d)
00504 #endif
00505 
00506 #ifndef AV_ZERO32
00507 #   define AV_ZERO32(d) AV_ZERO(32, d)
00508 #endif
00509 
00510 #ifndef AV_ZERO64
00511 #   define AV_ZERO64(d) AV_ZERO(64, d)
00512 #endif
00513 
00514 #ifndef AV_ZERO128
00515 #   define AV_ZERO128(d)         \
00516     do {                         \
00517         AV_ZERO64(d);            \
00518         AV_ZERO64((char*)(d)+8); \
00519     } while(0)
00520 #endif
00521 
00522 #endif /* AVUTIL_INTREADWRITE_H */