FFmpeg
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|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_AARCH64
68 # include "aarch64/intreadwrite.h"
69 #elif ARCH_MIPS
70 # include "mips/intreadwrite.h"
71 #elif ARCH_PPC
72 # include "ppc/intreadwrite.h"
73 #elif ARCH_X86
74 # include "x86/intreadwrite.h"
75 #endif
76 
77 #endif /* HAVE_AV_CONFIG_H */
78 
79 /*
80  * Map AV_RNXX <-> AV_R[BL]XX for all variants provided by per-arch headers.
81  */
82 
83 #if AV_HAVE_BIGENDIAN
84 
85 # if defined(AV_RN16) && !defined(AV_RB16)
86 # define AV_RB16(p) AV_RN16(p)
87 # elif !defined(AV_RN16) && defined(AV_RB16)
88 # define AV_RN16(p) AV_RB16(p)
89 # endif
90 
91 # if defined(AV_WN16) && !defined(AV_WB16)
92 # define AV_WB16(p, v) AV_WN16(p, v)
93 # elif !defined(AV_WN16) && defined(AV_WB16)
94 # define AV_WN16(p, v) AV_WB16(p, v)
95 # endif
96 
97 # if defined(AV_RN24) && !defined(AV_RB24)
98 # define AV_RB24(p) AV_RN24(p)
99 # elif !defined(AV_RN24) && defined(AV_RB24)
100 # define AV_RN24(p) AV_RB24(p)
101 # endif
102 
103 # if defined(AV_WN24) && !defined(AV_WB24)
104 # define AV_WB24(p, v) AV_WN24(p, v)
105 # elif !defined(AV_WN24) && defined(AV_WB24)
106 # define AV_WN24(p, v) AV_WB24(p, v)
107 # endif
108 
109 # if defined(AV_RN32) && !defined(AV_RB32)
110 # define AV_RB32(p) AV_RN32(p)
111 # elif !defined(AV_RN32) && defined(AV_RB32)
112 # define AV_RN32(p) AV_RB32(p)
113 # endif
114 
115 # if defined(AV_WN32) && !defined(AV_WB32)
116 # define AV_WB32(p, v) AV_WN32(p, v)
117 # elif !defined(AV_WN32) && defined(AV_WB32)
118 # define AV_WN32(p, v) AV_WB32(p, v)
119 # endif
120 
121 # if defined(AV_RN48) && !defined(AV_RB48)
122 # define AV_RB48(p) AV_RN48(p)
123 # elif !defined(AV_RN48) && defined(AV_RB48)
124 # define AV_RN48(p) AV_RB48(p)
125 # endif
126 
127 # if defined(AV_WN48) && !defined(AV_WB48)
128 # define AV_WB48(p, v) AV_WN48(p, v)
129 # elif !defined(AV_WN48) && defined(AV_WB48)
130 # define AV_WN48(p, v) AV_WB48(p, v)
131 # endif
132 
133 # if defined(AV_RN64) && !defined(AV_RB64)
134 # define AV_RB64(p) AV_RN64(p)
135 # elif !defined(AV_RN64) && defined(AV_RB64)
136 # define AV_RN64(p) AV_RB64(p)
137 # endif
138 
139 # if defined(AV_WN64) && !defined(AV_WB64)
140 # define AV_WB64(p, v) AV_WN64(p, v)
141 # elif !defined(AV_WN64) && defined(AV_WB64)
142 # define AV_WN64(p, v) AV_WB64(p, v)
143 # endif
144 
145 #else /* AV_HAVE_BIGENDIAN */
146 
147 # if defined(AV_RN16) && !defined(AV_RL16)
148 # define AV_RL16(p) AV_RN16(p)
149 # elif !defined(AV_RN16) && defined(AV_RL16)
150 # define AV_RN16(p) AV_RL16(p)
151 # endif
152 
153 # if defined(AV_WN16) && !defined(AV_WL16)
154 # define AV_WL16(p, v) AV_WN16(p, v)
155 # elif !defined(AV_WN16) && defined(AV_WL16)
156 # define AV_WN16(p, v) AV_WL16(p, v)
157 # endif
158 
159 # if defined(AV_RN24) && !defined(AV_RL24)
160 # define AV_RL24(p) AV_RN24(p)
161 # elif !defined(AV_RN24) && defined(AV_RL24)
162 # define AV_RN24(p) AV_RL24(p)
163 # endif
164 
165 # if defined(AV_WN24) && !defined(AV_WL24)
166 # define AV_WL24(p, v) AV_WN24(p, v)
167 # elif !defined(AV_WN24) && defined(AV_WL24)
168 # define AV_WN24(p, v) AV_WL24(p, v)
169 # endif
170 
171 # if defined(AV_RN32) && !defined(AV_RL32)
172 # define AV_RL32(p) AV_RN32(p)
173 # elif !defined(AV_RN32) && defined(AV_RL32)
174 # define AV_RN32(p) AV_RL32(p)
175 # endif
176 
177 # if defined(AV_WN32) && !defined(AV_WL32)
178 # define AV_WL32(p, v) AV_WN32(p, v)
179 # elif !defined(AV_WN32) && defined(AV_WL32)
180 # define AV_WN32(p, v) AV_WL32(p, v)
181 # endif
182 
183 # if defined(AV_RN48) && !defined(AV_RL48)
184 # define AV_RL48(p) AV_RN48(p)
185 # elif !defined(AV_RN48) && defined(AV_RL48)
186 # define AV_RN48(p) AV_RL48(p)
187 # endif
188 
189 # if defined(AV_WN48) && !defined(AV_WL48)
190 # define AV_WL48(p, v) AV_WN48(p, v)
191 # elif !defined(AV_WN48) && defined(AV_WL48)
192 # define AV_WN48(p, v) AV_WL48(p, v)
193 # endif
194 
195 # if defined(AV_RN64) && !defined(AV_RL64)
196 # define AV_RL64(p) AV_RN64(p)
197 # elif !defined(AV_RN64) && defined(AV_RL64)
198 # define AV_RN64(p) AV_RL64(p)
199 # endif
200 
201 # if defined(AV_WN64) && !defined(AV_WL64)
202 # define AV_WL64(p, v) AV_WN64(p, v)
203 # elif !defined(AV_WN64) && defined(AV_WL64)
204 # define AV_WN64(p, v) AV_WL64(p, v)
205 # endif
206 
207 #endif /* !AV_HAVE_BIGENDIAN */
208 
209 /*
210  * Define AV_[RW]N helper macros to simplify definitions not provided
211  * by per-arch headers.
212  */
213 
214 #if defined(__GNUC__) || defined(__clang__)
215 
216 union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
217 union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
218 union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
219 
220 # define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
221 # define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))
222 
223 #elif defined(_MSC_VER) && (defined(_M_ARM) || defined(_M_X64) || defined(_M_ARM64)) && AV_HAVE_FAST_UNALIGNED
224 
225 # define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
226 # define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))
227 
228 #elif AV_HAVE_FAST_UNALIGNED
229 
230 # define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
231 # define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))
232 
233 #else
234 
235 #ifndef AV_RB16
236 # define AV_RB16(x) \
237  ((((const uint8_t*)(x))[0] << 8) | \
238  ((const uint8_t*)(x))[1])
239 #endif
240 #ifndef AV_WB16
241 # define AV_WB16(p, val) do { \
242  uint16_t d = (val); \
243  ((uint8_t*)(p))[1] = (d); \
244  ((uint8_t*)(p))[0] = (d)>>8; \
245  } while(0)
246 #endif
247 
248 #ifndef AV_RL16
249 # define AV_RL16(x) \
250  ((((const uint8_t*)(x))[1] << 8) | \
251  ((const uint8_t*)(x))[0])
252 #endif
253 #ifndef AV_WL16
254 # define AV_WL16(p, val) do { \
255  uint16_t d = (val); \
256  ((uint8_t*)(p))[0] = (d); \
257  ((uint8_t*)(p))[1] = (d)>>8; \
258  } while(0)
259 #endif
260 
261 #ifndef AV_RB32
262 # define AV_RB32(x) \
263  (((uint32_t)((const uint8_t*)(x))[0] << 24) | \
264  (((const uint8_t*)(x))[1] << 16) | \
265  (((const uint8_t*)(x))[2] << 8) | \
266  ((const uint8_t*)(x))[3])
267 #endif
268 #ifndef AV_WB32
269 # define AV_WB32(p, val) do { \
270  uint32_t d = (val); \
271  ((uint8_t*)(p))[3] = (d); \
272  ((uint8_t*)(p))[2] = (d)>>8; \
273  ((uint8_t*)(p))[1] = (d)>>16; \
274  ((uint8_t*)(p))[0] = (d)>>24; \
275  } while(0)
276 #endif
277 
278 #ifndef AV_RL32
279 # define AV_RL32(x) \
280  (((uint32_t)((const uint8_t*)(x))[3] << 24) | \
281  (((const uint8_t*)(x))[2] << 16) | \
282  (((const uint8_t*)(x))[1] << 8) | \
283  ((const uint8_t*)(x))[0])
284 #endif
285 #ifndef AV_WL32
286 # define AV_WL32(p, val) do { \
287  uint32_t d = (val); \
288  ((uint8_t*)(p))[0] = (d); \
289  ((uint8_t*)(p))[1] = (d)>>8; \
290  ((uint8_t*)(p))[2] = (d)>>16; \
291  ((uint8_t*)(p))[3] = (d)>>24; \
292  } while(0)
293 #endif
294 
295 #ifndef AV_RB64
296 # define AV_RB64(x) \
297  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
298  ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
299  ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
300  ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
301  ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
302  ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
303  ((uint64_t)((const uint8_t*)(x))[6] << 8) | \
304  (uint64_t)((const uint8_t*)(x))[7])
305 #endif
306 #ifndef AV_WB64
307 # define AV_WB64(p, val) do { \
308  uint64_t d = (val); \
309  ((uint8_t*)(p))[7] = (d); \
310  ((uint8_t*)(p))[6] = (d)>>8; \
311  ((uint8_t*)(p))[5] = (d)>>16; \
312  ((uint8_t*)(p))[4] = (d)>>24; \
313  ((uint8_t*)(p))[3] = (d)>>32; \
314  ((uint8_t*)(p))[2] = (d)>>40; \
315  ((uint8_t*)(p))[1] = (d)>>48; \
316  ((uint8_t*)(p))[0] = (d)>>56; \
317  } while(0)
318 #endif
319 
320 #ifndef AV_RL64
321 # define AV_RL64(x) \
322  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
323  ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
324  ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
325  ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
326  ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
327  ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
328  ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
329  (uint64_t)((const uint8_t*)(x))[0])
330 #endif
331 #ifndef AV_WL64
332 # define AV_WL64(p, val) do { \
333  uint64_t d = (val); \
334  ((uint8_t*)(p))[0] = (d); \
335  ((uint8_t*)(p))[1] = (d)>>8; \
336  ((uint8_t*)(p))[2] = (d)>>16; \
337  ((uint8_t*)(p))[3] = (d)>>24; \
338  ((uint8_t*)(p))[4] = (d)>>32; \
339  ((uint8_t*)(p))[5] = (d)>>40; \
340  ((uint8_t*)(p))[6] = (d)>>48; \
341  ((uint8_t*)(p))[7] = (d)>>56; \
342  } while(0)
343 #endif
344 
345 #if AV_HAVE_BIGENDIAN
346 # define AV_RN(s, p) AV_RB##s(p)
347 # define AV_WN(s, p, v) AV_WB##s(p, v)
348 #else
349 # define AV_RN(s, p) AV_RL##s(p)
350 # define AV_WN(s, p, v) AV_WL##s(p, v)
351 #endif
352 
353 #endif /* HAVE_FAST_UNALIGNED */
354 
355 #ifndef AV_RN16
356 # define AV_RN16(p) AV_RN(16, p)
357 #endif
358 
359 #ifndef AV_RN32
360 # define AV_RN32(p) AV_RN(32, p)
361 #endif
362 
363 #ifndef AV_RN64
364 # define AV_RN64(p) AV_RN(64, p)
365 #endif
366 
367 #ifndef AV_WN16
368 # define AV_WN16(p, v) AV_WN(16, p, v)
369 #endif
370 
371 #ifndef AV_WN32
372 # define AV_WN32(p, v) AV_WN(32, p, v)
373 #endif
374 
375 #ifndef AV_WN64
376 # define AV_WN64(p, v) AV_WN(64, p, v)
377 #endif
378 
379 #if AV_HAVE_BIGENDIAN
380 # define AV_RB(s, p) AV_RN##s(p)
381 # define AV_WB(s, p, v) AV_WN##s(p, v)
382 # define AV_RL(s, p) av_bswap##s(AV_RN##s(p))
383 # define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v))
384 #else
385 # define AV_RB(s, p) av_bswap##s(AV_RN##s(p))
386 # define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v))
387 # define AV_RL(s, p) AV_RN##s(p)
388 # define AV_WL(s, p, v) AV_WN##s(p, v)
389 #endif
390 
391 #define AV_RB8(x) (((const uint8_t*)(x))[0])
392 #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
393 
394 #define AV_RL8(x) AV_RB8(x)
395 #define AV_WL8(p, d) AV_WB8(p, d)
396 
397 #ifndef AV_RB16
398 # define AV_RB16(p) AV_RB(16, p)
399 #endif
400 #ifndef AV_WB16
401 # define AV_WB16(p, v) AV_WB(16, p, v)
402 #endif
403 
404 #ifndef AV_RL16
405 # define AV_RL16(p) AV_RL(16, p)
406 #endif
407 #ifndef AV_WL16
408 # define AV_WL16(p, v) AV_WL(16, p, v)
409 #endif
410 
411 #ifndef AV_RB32
412 # define AV_RB32(p) AV_RB(32, p)
413 #endif
414 #ifndef AV_WB32
415 # define AV_WB32(p, v) AV_WB(32, p, v)
416 #endif
417 
418 #ifndef AV_RL32
419 # define AV_RL32(p) AV_RL(32, p)
420 #endif
421 #ifndef AV_WL32
422 # define AV_WL32(p, v) AV_WL(32, p, v)
423 #endif
424 
425 #ifndef AV_RB64
426 # define AV_RB64(p) AV_RB(64, p)
427 #endif
428 #ifndef AV_WB64
429 # define AV_WB64(p, v) AV_WB(64, p, v)
430 #endif
431 
432 #ifndef AV_RL64
433 # define AV_RL64(p) AV_RL(64, p)
434 #endif
435 #ifndef AV_WL64
436 # define AV_WL64(p, v) AV_WL(64, p, v)
437 #endif
438 
439 #ifndef AV_RB24
440 # define AV_RB24(x) \
441  ((((const uint8_t*)(x))[0] << 16) | \
442  (((const uint8_t*)(x))[1] << 8) | \
443  ((const uint8_t*)(x))[2])
444 #endif
445 #ifndef AV_WB24
446 # define AV_WB24(p, d) do { \
447  ((uint8_t*)(p))[2] = (d); \
448  ((uint8_t*)(p))[1] = (d)>>8; \
449  ((uint8_t*)(p))[0] = (d)>>16; \
450  } while(0)
451 #endif
452 
453 #ifndef AV_RL24
454 # define AV_RL24(x) \
455  ((((const uint8_t*)(x))[2] << 16) | \
456  (((const uint8_t*)(x))[1] << 8) | \
457  ((const uint8_t*)(x))[0])
458 #endif
459 #ifndef AV_WL24
460 # define AV_WL24(p, d) do { \
461  ((uint8_t*)(p))[0] = (d); \
462  ((uint8_t*)(p))[1] = (d)>>8; \
463  ((uint8_t*)(p))[2] = (d)>>16; \
464  } while(0)
465 #endif
466 
467 #ifndef AV_RB48
468 # define AV_RB48(x) \
469  (((uint64_t)((const uint8_t*)(x))[0] << 40) | \
470  ((uint64_t)((const uint8_t*)(x))[1] << 32) | \
471  ((uint64_t)((const uint8_t*)(x))[2] << 24) | \
472  ((uint64_t)((const uint8_t*)(x))[3] << 16) | \
473  ((uint64_t)((const uint8_t*)(x))[4] << 8) | \
474  (uint64_t)((const uint8_t*)(x))[5])
475 #endif
476 #ifndef AV_WB48
477 # define AV_WB48(p, darg) do { \
478  uint64_t d = (darg); \
479  ((uint8_t*)(p))[5] = (d); \
480  ((uint8_t*)(p))[4] = (d)>>8; \
481  ((uint8_t*)(p))[3] = (d)>>16; \
482  ((uint8_t*)(p))[2] = (d)>>24; \
483  ((uint8_t*)(p))[1] = (d)>>32; \
484  ((uint8_t*)(p))[0] = (d)>>40; \
485  } while(0)
486 #endif
487 
488 #ifndef AV_RL48
489 # define AV_RL48(x) \
490  (((uint64_t)((const uint8_t*)(x))[5] << 40) | \
491  ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
492  ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
493  ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
494  ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
495  (uint64_t)((const uint8_t*)(x))[0])
496 #endif
497 #ifndef AV_WL48
498 # define AV_WL48(p, darg) do { \
499  uint64_t d = (darg); \
500  ((uint8_t*)(p))[0] = (d); \
501  ((uint8_t*)(p))[1] = (d)>>8; \
502  ((uint8_t*)(p))[2] = (d)>>16; \
503  ((uint8_t*)(p))[3] = (d)>>24; \
504  ((uint8_t*)(p))[4] = (d)>>32; \
505  ((uint8_t*)(p))[5] = (d)>>40; \
506  } while(0)
507 #endif
508 
509 /*
510  * The AV_[RW]NA macros access naturally aligned data
511  * in a type-safe way.
512  */
513 
514 #define AV_RNA(s, p) (((const av_alias##s*)(p))->u##s)
515 #define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))
516 
517 #ifndef AV_RN16A
518 # define AV_RN16A(p) AV_RNA(16, p)
519 #endif
520 
521 #ifndef AV_RN32A
522 # define AV_RN32A(p) AV_RNA(32, p)
523 #endif
524 
525 #ifndef AV_RN64A
526 # define AV_RN64A(p) AV_RNA(64, p)
527 #endif
528 
529 #ifndef AV_WN16A
530 # define AV_WN16A(p, v) AV_WNA(16, p, v)
531 #endif
532 
533 #ifndef AV_WN32A
534 # define AV_WN32A(p, v) AV_WNA(32, p, v)
535 #endif
536 
537 #ifndef AV_WN64A
538 # define AV_WN64A(p, v) AV_WNA(64, p, v)
539 #endif
540 
541 #if AV_HAVE_BIGENDIAN
542 # define AV_RLA(s, p) av_bswap##s(AV_RN##s##A(p))
543 # define AV_WLA(s, p, v) AV_WN##s##A(p, av_bswap##s(v))
544 # define AV_RBA(s, p) AV_RN##s##A(p)
545 # define AV_WBA(s, p, v) AV_WN##s##A(p, v)
546 #else
547 # define AV_RLA(s, p) AV_RN##s##A(p)
548 # define AV_WLA(s, p, v) AV_WN##s##A(p, v)
549 # define AV_RBA(s, p) av_bswap##s(AV_RN##s##A(p))
550 # define AV_WBA(s, p, v) AV_WN##s##A(p, av_bswap##s(v))
551 #endif
552 
553 #ifndef AV_RL16A
554 # define AV_RL16A(p) AV_RLA(16, p)
555 #endif
556 #ifndef AV_WL16A
557 # define AV_WL16A(p, v) AV_WLA(16, p, v)
558 #endif
559 
560 #ifndef AV_RB16A
561 # define AV_RB16A(p) AV_RBA(16, p)
562 #endif
563 #ifndef AV_WB16A
564 # define AV_WB16A(p, v) AV_WBA(16, p, v)
565 #endif
566 
567 #ifndef AV_RL32A
568 # define AV_RL32A(p) AV_RLA(32, p)
569 #endif
570 #ifndef AV_WL32A
571 # define AV_WL32A(p, v) AV_WLA(32, p, v)
572 #endif
573 
574 #ifndef AV_RB32A
575 # define AV_RB32A(p) AV_RBA(32, p)
576 #endif
577 #ifndef AV_WB32A
578 # define AV_WB32A(p, v) AV_WBA(32, p, v)
579 #endif
580 
581 #ifndef AV_RL64A
582 # define AV_RL64A(p) AV_RLA(64, p)
583 #endif
584 #ifndef AV_WL64A
585 # define AV_WL64A(p, v) AV_WLA(64, p, v)
586 #endif
587 
588 #ifndef AV_RB64A
589 # define AV_RB64A(p) AV_RBA(64, p)
590 #endif
591 #ifndef AV_WB64A
592 # define AV_WB64A(p, v) AV_WBA(64, p, v)
593 #endif
594 
595 /*
596  * The AV_COPYxxU macros are suitable for copying data to/from unaligned
597  * memory locations.
598  */
599 
600 #define AV_COPYU(n, d, s) AV_WN##n(d, AV_RN##n(s));
601 
602 #ifndef AV_COPY16U
603 # define AV_COPY16U(d, s) AV_COPYU(16, d, s)
604 #endif
605 
606 #ifndef AV_COPY32U
607 # define AV_COPY32U(d, s) AV_COPYU(32, d, s)
608 #endif
609 
610 #ifndef AV_COPY64U
611 # define AV_COPY64U(d, s) AV_COPYU(64, d, s)
612 #endif
613 
614 #ifndef AV_COPY128U
615 # define AV_COPY128U(d, s) \
616  do { \
617  AV_COPY64U(d, s); \
618  AV_COPY64U((char *)(d) + 8, (const char *)(s) + 8); \
619  } while(0)
620 #endif
621 
622 /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
623  * naturally aligned.
624  */
625 
626 #define AV_COPY(n, d, s) \
627  (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)
628 
629 #ifndef AV_COPY16
630 # define AV_COPY16(d, s) AV_COPY(16, d, s)
631 #endif
632 
633 #ifndef AV_COPY32
634 # define AV_COPY32(d, s) AV_COPY(32, d, s)
635 #endif
636 
637 #ifndef AV_COPY64
638 # define AV_COPY64(d, s) AV_COPY(64, d, s)
639 #endif
640 
641 #ifndef AV_COPY128
642 # define AV_COPY128(d, s) \
643  do { \
644  AV_COPY64(d, s); \
645  AV_COPY64((char*)(d)+8, (char*)(s)+8); \
646  } while(0)
647 #endif
648 
649 #define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))
650 
651 #ifndef AV_SWAP64
652 # define AV_SWAP64(a, b) AV_SWAP(64, a, b)
653 #endif
654 
655 #define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)
656 
657 #ifndef AV_ZERO16
658 # define AV_ZERO16(d) AV_ZERO(16, d)
659 #endif
660 
661 #ifndef AV_ZERO32
662 # define AV_ZERO32(d) AV_ZERO(32, d)
663 #endif
664 
665 #ifndef AV_ZERO64
666 # define AV_ZERO64(d) AV_ZERO(64, d)
667 #endif
668 
669 #ifndef AV_ZERO128
670 # define AV_ZERO128(d) \
671  do { \
672  AV_ZERO64(d); \
673  AV_ZERO64((char*)(d)+8); \
674  } while(0)
675 #endif
676 
677 #endif /* AVUTIL_INTREADWRITE_H */
intreadwrite.h
unaligned_64::l
uint64_t l
Definition: intreadwrite.h:216
av_alias::f64
double f64
Definition: intreadwrite.h:32
intreadwrite.h
av_alias
Definition: intreadwrite.h:27
av_alias::u64
uint64_t u64
Definition: intreadwrite.h:28
intreadwrite.h
unaligned_64
Definition: intreadwrite.h:216
intreadwrite.h
unaligned_16::l
uint16_t l
Definition: intreadwrite.h:218
unaligned_32
Definition: intreadwrite.h:217
attributes.h
av_alias
union unaligned_64 av_alias
unaligned_16
Definition: intreadwrite.h:218
bswap.h
unaligned_32::l
uint32_t l
Definition: intreadwrite.h:217
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