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