intreadwrite.h
Go to the documentation of this file.
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 
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_RN48) && !defined(AV_RB48)
118 # define AV_RB48(p) AV_RN48(p)
119 # elif !defined(AV_RN48) && defined(AV_RB48)
120 # define AV_RN48(p) AV_RB48(p)
121 # endif
122 
123 # if defined(AV_WN48) && !defined(AV_WB48)
124 # define AV_WB48(p, v) AV_WN48(p, v)
125 # elif !defined(AV_WN48) && defined(AV_WB48)
126 # define AV_WN48(p, v) AV_WB48(p, v)
127 # endif
128 
129 # if defined(AV_RN64) && !defined(AV_RB64)
130 # define AV_RB64(p) AV_RN64(p)
131 # elif !defined(AV_RN64) && defined(AV_RB64)
132 # define AV_RN64(p) AV_RB64(p)
133 # endif
134 
135 # if defined(AV_WN64) && !defined(AV_WB64)
136 # define AV_WB64(p, v) AV_WN64(p, v)
137 # elif !defined(AV_WN64) && defined(AV_WB64)
138 # define AV_WN64(p, v) AV_WB64(p, v)
139 # endif
140 
141 #else /* AV_HAVE_BIGENDIAN */
142 
143 # if defined(AV_RN16) && !defined(AV_RL16)
144 # define AV_RL16(p) AV_RN16(p)
145 # elif !defined(AV_RN16) && defined(AV_RL16)
146 # define AV_RN16(p) AV_RL16(p)
147 # endif
148 
149 # if defined(AV_WN16) && !defined(AV_WL16)
150 # define AV_WL16(p, v) AV_WN16(p, v)
151 # elif !defined(AV_WN16) && defined(AV_WL16)
152 # define AV_WN16(p, v) AV_WL16(p, v)
153 # endif
154 
155 # if defined(AV_RN24) && !defined(AV_RL24)
156 # define AV_RL24(p) AV_RN24(p)
157 # elif !defined(AV_RN24) && defined(AV_RL24)
158 # define AV_RN24(p) AV_RL24(p)
159 # endif
160 
161 # if defined(AV_WN24) && !defined(AV_WL24)
162 # define AV_WL24(p, v) AV_WN24(p, v)
163 # elif !defined(AV_WN24) && defined(AV_WL24)
164 # define AV_WN24(p, v) AV_WL24(p, v)
165 # endif
166 
167 # if defined(AV_RN32) && !defined(AV_RL32)
168 # define AV_RL32(p) AV_RN32(p)
169 # elif !defined(AV_RN32) && defined(AV_RL32)
170 # define AV_RN32(p) AV_RL32(p)
171 # endif
172 
173 # if defined(AV_WN32) && !defined(AV_WL32)
174 # define AV_WL32(p, v) AV_WN32(p, v)
175 # elif !defined(AV_WN32) && defined(AV_WL32)
176 # define AV_WN32(p, v) AV_WL32(p, v)
177 # endif
178 
179 # if defined(AV_RN48) && !defined(AV_RL48)
180 # define AV_RL48(p) AV_RN48(p)
181 # elif !defined(AV_RN48) && defined(AV_RL48)
182 # define AV_RN48(p) AV_RL48(p)
183 # endif
184 
185 # if defined(AV_WN48) && !defined(AV_WL48)
186 # define AV_WL48(p, v) AV_WN48(p, v)
187 # elif !defined(AV_WN48) && defined(AV_WL48)
188 # define AV_WN48(p, v) AV_WL48(p, v)
189 # endif
190 
191 # if defined(AV_RN64) && !defined(AV_RL64)
192 # define AV_RL64(p) AV_RN64(p)
193 # elif !defined(AV_RN64) && defined(AV_RL64)
194 # define AV_RN64(p) AV_RL64(p)
195 # endif
196 
197 # if defined(AV_WN64) && !defined(AV_WL64)
198 # define AV_WL64(p, v) AV_WN64(p, v)
199 # elif !defined(AV_WN64) && defined(AV_WL64)
200 # define AV_WN64(p, v) AV_WL64(p, v)
201 # endif
202 
203 #endif /* !AV_HAVE_BIGENDIAN */
204 
205 /*
206  * Define AV_[RW]N helper macros to simplify definitions not provided
207  * by per-arch headers.
208  */
209 
210 #if defined(__GNUC__) && !defined(__TI_COMPILER_VERSION__)
211 
212 union unaligned_64 { uint64_t l; } __attribute__((packed)) av_alias;
213 union unaligned_32 { uint32_t l; } __attribute__((packed)) av_alias;
214 union unaligned_16 { uint16_t l; } __attribute__((packed)) av_alias;
215 
216 # define AV_RN(s, p) (((const union unaligned_##s *) (p))->l)
217 # define AV_WN(s, p, v) ((((union unaligned_##s *) (p))->l) = (v))
218 
219 #elif defined(__DECC)
220 
221 # define AV_RN(s, p) (*((const __unaligned uint##s##_t*)(p)))
222 # define AV_WN(s, p, v) (*((__unaligned uint##s##_t*)(p)) = (v))
223 
224 #elif AV_HAVE_FAST_UNALIGNED
225 
226 # define AV_RN(s, p) (((const av_alias##s*)(p))->u##s)
227 # define AV_WN(s, p, v) (((av_alias##s*)(p))->u##s = (v))
228 
229 #else
230 
231 #ifndef AV_RB16
232 # define AV_RB16(x) \
233  ((((const uint8_t*)(x))[0] << 8) | \
234  ((const uint8_t*)(x))[1])
235 #endif
236 #ifndef AV_WB16
237 # define AV_WB16(p, darg) do { \
238  unsigned d = (darg); \
239  ((uint8_t*)(p))[1] = (d); \
240  ((uint8_t*)(p))[0] = (d)>>8; \
241  } while(0)
242 #endif
243 
244 #ifndef AV_RL16
245 # define AV_RL16(x) \
246  ((((const uint8_t*)(x))[1] << 8) | \
247  ((const uint8_t*)(x))[0])
248 #endif
249 #ifndef AV_WL16
250 # define AV_WL16(p, darg) do { \
251  unsigned d = (darg); \
252  ((uint8_t*)(p))[0] = (d); \
253  ((uint8_t*)(p))[1] = (d)>>8; \
254  } while(0)
255 #endif
256 
257 #ifndef AV_RB32
258 # define AV_RB32(x) \
259  (((uint32_t)((const uint8_t*)(x))[0] << 24) | \
260  (((const uint8_t*)(x))[1] << 16) | \
261  (((const uint8_t*)(x))[2] << 8) | \
262  ((const uint8_t*)(x))[3])
263 #endif
264 #ifndef AV_WB32
265 # define AV_WB32(p, darg) do { \
266  unsigned d = (darg); \
267  ((uint8_t*)(p))[3] = (d); \
268  ((uint8_t*)(p))[2] = (d)>>8; \
269  ((uint8_t*)(p))[1] = (d)>>16; \
270  ((uint8_t*)(p))[0] = (d)>>24; \
271  } while(0)
272 #endif
273 
274 #ifndef AV_RL32
275 # define AV_RL32(x) \
276  (((uint32_t)((const uint8_t*)(x))[3] << 24) | \
277  (((const uint8_t*)(x))[2] << 16) | \
278  (((const uint8_t*)(x))[1] << 8) | \
279  ((const uint8_t*)(x))[0])
280 #endif
281 #ifndef AV_WL32
282 # define AV_WL32(p, darg) do { \
283  unsigned d = (darg); \
284  ((uint8_t*)(p))[0] = (d); \
285  ((uint8_t*)(p))[1] = (d)>>8; \
286  ((uint8_t*)(p))[2] = (d)>>16; \
287  ((uint8_t*)(p))[3] = (d)>>24; \
288  } while(0)
289 #endif
290 
291 #ifndef AV_RB64
292 # define AV_RB64(x) \
293  (((uint64_t)((const uint8_t*)(x))[0] << 56) | \
294  ((uint64_t)((const uint8_t*)(x))[1] << 48) | \
295  ((uint64_t)((const uint8_t*)(x))[2] << 40) | \
296  ((uint64_t)((const uint8_t*)(x))[3] << 32) | \
297  ((uint64_t)((const uint8_t*)(x))[4] << 24) | \
298  ((uint64_t)((const uint8_t*)(x))[5] << 16) | \
299  ((uint64_t)((const uint8_t*)(x))[6] << 8) | \
300  (uint64_t)((const uint8_t*)(x))[7])
301 #endif
302 #ifndef AV_WB64
303 # define AV_WB64(p, darg) do { \
304  uint64_t d = (darg); \
305  ((uint8_t*)(p))[7] = (d); \
306  ((uint8_t*)(p))[6] = (d)>>8; \
307  ((uint8_t*)(p))[5] = (d)>>16; \
308  ((uint8_t*)(p))[4] = (d)>>24; \
309  ((uint8_t*)(p))[3] = (d)>>32; \
310  ((uint8_t*)(p))[2] = (d)>>40; \
311  ((uint8_t*)(p))[1] = (d)>>48; \
312  ((uint8_t*)(p))[0] = (d)>>56; \
313  } while(0)
314 #endif
315 
316 #ifndef AV_RL64
317 # define AV_RL64(x) \
318  (((uint64_t)((const uint8_t*)(x))[7] << 56) | \
319  ((uint64_t)((const uint8_t*)(x))[6] << 48) | \
320  ((uint64_t)((const uint8_t*)(x))[5] << 40) | \
321  ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
322  ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
323  ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
324  ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
325  (uint64_t)((const uint8_t*)(x))[0])
326 #endif
327 #ifndef AV_WL64
328 # define AV_WL64(p, darg) do { \
329  uint64_t d = (darg); \
330  ((uint8_t*)(p))[0] = (d); \
331  ((uint8_t*)(p))[1] = (d)>>8; \
332  ((uint8_t*)(p))[2] = (d)>>16; \
333  ((uint8_t*)(p))[3] = (d)>>24; \
334  ((uint8_t*)(p))[4] = (d)>>32; \
335  ((uint8_t*)(p))[5] = (d)>>40; \
336  ((uint8_t*)(p))[6] = (d)>>48; \
337  ((uint8_t*)(p))[7] = (d)>>56; \
338  } while(0)
339 #endif
340 
341 #if AV_HAVE_BIGENDIAN
342 # define AV_RN(s, p) AV_RB##s(p)
343 # define AV_WN(s, p, v) AV_WB##s(p, v)
344 #else
345 # define AV_RN(s, p) AV_RL##s(p)
346 # define AV_WN(s, p, v) AV_WL##s(p, v)
347 #endif
348 
349 #endif /* HAVE_FAST_UNALIGNED */
350 
351 #ifndef AV_RN16
352 # define AV_RN16(p) AV_RN(16, p)
353 #endif
354 
355 #ifndef AV_RN32
356 # define AV_RN32(p) AV_RN(32, p)
357 #endif
358 
359 #ifndef AV_RN64
360 # define AV_RN64(p) AV_RN(64, p)
361 #endif
362 
363 #ifndef AV_WN16
364 # define AV_WN16(p, v) AV_WN(16, p, v)
365 #endif
366 
367 #ifndef AV_WN32
368 # define AV_WN32(p, v) AV_WN(32, p, v)
369 #endif
370 
371 #ifndef AV_WN64
372 # define AV_WN64(p, v) AV_WN(64, p, v)
373 #endif
374 
375 #if AV_HAVE_BIGENDIAN
376 # define AV_RB(s, p) AV_RN##s(p)
377 # define AV_WB(s, p, v) AV_WN##s(p, v)
378 # define AV_RL(s, p) av_bswap##s(AV_RN##s(p))
379 # define AV_WL(s, p, v) AV_WN##s(p, av_bswap##s(v))
380 #else
381 # define AV_RB(s, p) av_bswap##s(AV_RN##s(p))
382 # define AV_WB(s, p, v) AV_WN##s(p, av_bswap##s(v))
383 # define AV_RL(s, p) AV_RN##s(p)
384 # define AV_WL(s, p, v) AV_WN##s(p, v)
385 #endif
386 
387 #define AV_RB8(x) (((const uint8_t*)(x))[0])
388 #define AV_WB8(p, d) do { ((uint8_t*)(p))[0] = (d); } while(0)
389 
390 #define AV_RL8(x) AV_RB8(x)
391 #define AV_WL8(p, d) AV_WB8(p, d)
392 
393 #ifndef AV_RB16
394 # define AV_RB16(p) AV_RB(16, p)
395 #endif
396 #ifndef AV_WB16
397 # define AV_WB16(p, v) AV_WB(16, p, v)
398 #endif
399 
400 #ifndef AV_RL16
401 # define AV_RL16(p) AV_RL(16, p)
402 #endif
403 #ifndef AV_WL16
404 # define AV_WL16(p, v) AV_WL(16, p, v)
405 #endif
406 
407 #ifndef AV_RB32
408 # define AV_RB32(p) AV_RB(32, p)
409 #endif
410 #ifndef AV_WB32
411 # define AV_WB32(p, v) AV_WB(32, p, v)
412 #endif
413 
414 #ifndef AV_RL32
415 # define AV_RL32(p) AV_RL(32, p)
416 #endif
417 #ifndef AV_WL32
418 # define AV_WL32(p, v) AV_WL(32, p, v)
419 #endif
420 
421 #ifndef AV_RB64
422 # define AV_RB64(p) AV_RB(64, p)
423 #endif
424 #ifndef AV_WB64
425 # define AV_WB64(p, v) AV_WB(64, p, v)
426 #endif
427 
428 #ifndef AV_RL64
429 # define AV_RL64(p) AV_RL(64, p)
430 #endif
431 #ifndef AV_WL64
432 # define AV_WL64(p, v) AV_WL(64, p, v)
433 #endif
434 
435 #ifndef AV_RB24
436 # define AV_RB24(x) \
437  ((((const uint8_t*)(x))[0] << 16) | \
438  (((const uint8_t*)(x))[1] << 8) | \
439  ((const uint8_t*)(x))[2])
440 #endif
441 #ifndef AV_WB24
442 # define AV_WB24(p, d) do { \
443  ((uint8_t*)(p))[2] = (d); \
444  ((uint8_t*)(p))[1] = (d)>>8; \
445  ((uint8_t*)(p))[0] = (d)>>16; \
446  } while(0)
447 #endif
448 
449 #ifndef AV_RL24
450 # define AV_RL24(x) \
451  ((((const uint8_t*)(x))[2] << 16) | \
452  (((const uint8_t*)(x))[1] << 8) | \
453  ((const uint8_t*)(x))[0])
454 #endif
455 #ifndef AV_WL24
456 # define AV_WL24(p, d) do { \
457  ((uint8_t*)(p))[0] = (d); \
458  ((uint8_t*)(p))[1] = (d)>>8; \
459  ((uint8_t*)(p))[2] = (d)>>16; \
460  } while(0)
461 #endif
462 
463 #ifndef AV_RB48
464 # define AV_RB48(x) \
465  (((uint64_t)((const uint8_t*)(x))[0] << 40) | \
466  ((uint64_t)((const uint8_t*)(x))[1] << 32) | \
467  ((uint64_t)((const uint8_t*)(x))[2] << 24) | \
468  ((uint64_t)((const uint8_t*)(x))[3] << 16) | \
469  ((uint64_t)((const uint8_t*)(x))[4] << 8) | \
470  (uint64_t)((const uint8_t*)(x))[5])
471 #endif
472 #ifndef AV_WB48
473 # define AV_WB48(p, darg) do { \
474  uint64_t d = (darg); \
475  ((uint8_t*)(p))[5] = (d); \
476  ((uint8_t*)(p))[4] = (d)>>8; \
477  ((uint8_t*)(p))[3] = (d)>>16; \
478  ((uint8_t*)(p))[2] = (d)>>24; \
479  ((uint8_t*)(p))[1] = (d)>>32; \
480  ((uint8_t*)(p))[0] = (d)>>40; \
481  } while(0)
482 #endif
483 
484 #ifndef AV_RL48
485 # define AV_RL48(x) \
486  (((uint64_t)((const uint8_t*)(x))[5] << 40) | \
487  ((uint64_t)((const uint8_t*)(x))[4] << 32) | \
488  ((uint64_t)((const uint8_t*)(x))[3] << 24) | \
489  ((uint64_t)((const uint8_t*)(x))[2] << 16) | \
490  ((uint64_t)((const uint8_t*)(x))[1] << 8) | \
491  (uint64_t)((const uint8_t*)(x))[0])
492 #endif
493 #ifndef AV_WL48
494 # define AV_WL48(p, darg) do { \
495  uint64_t d = (darg); \
496  ((uint8_t*)(p))[0] = (d); \
497  ((uint8_t*)(p))[1] = (d)>>8; \
498  ((uint8_t*)(p))[2] = (d)>>16; \
499  ((uint8_t*)(p))[3] = (d)>>24; \
500  ((uint8_t*)(p))[4] = (d)>>32; \
501  ((uint8_t*)(p))[5] = (d)>>40; \
502  } while(0)
503 #endif
504 
505 /*
506  * The AV_[RW]NA macros access naturally aligned data
507  * in a type-safe way.
508  */
509 
510 #define AV_RNA(s, p) (((const av_alias##s*)(p))->u##s)
511 #define AV_WNA(s, p, v) (((av_alias##s*)(p))->u##s = (v))
512 
513 #ifndef AV_RN16A
514 # define AV_RN16A(p) AV_RNA(16, p)
515 #endif
516 
517 #ifndef AV_RN32A
518 # define AV_RN32A(p) AV_RNA(32, p)
519 #endif
520 
521 #ifndef AV_RN64A
522 # define AV_RN64A(p) AV_RNA(64, p)
523 #endif
524 
525 #ifndef AV_WN16A
526 # define AV_WN16A(p, v) AV_WNA(16, p, v)
527 #endif
528 
529 #ifndef AV_WN32A
530 # define AV_WN32A(p, v) AV_WNA(32, p, v)
531 #endif
532 
533 #ifndef AV_WN64A
534 # define AV_WN64A(p, v) AV_WNA(64, p, v)
535 #endif
536 
537 /*
538  * The AV_COPYxxU macros are suitable for copying data to/from unaligned
539  * memory locations.
540  */
541 
542 #define AV_COPYU(n, d, s) AV_WN##n(d, AV_RN##n(s));
543 
544 #ifndef AV_COPY16U
545 # define AV_COPY16U(d, s) AV_COPYU(16, d, s)
546 #endif
547 
548 #ifndef AV_COPY32U
549 # define AV_COPY32U(d, s) AV_COPYU(32, d, s)
550 #endif
551 
552 #ifndef AV_COPY64U
553 # define AV_COPY64U(d, s) AV_COPYU(64, d, s)
554 #endif
555 
556 #ifndef AV_COPY128U
557 # define AV_COPY128U(d, s) \
558  do { \
559  AV_COPY64U(d, s); \
560  AV_COPY64U((char *)(d) + 8, (const char *)(s) + 8); \
561  } while(0)
562 #endif
563 
564 /* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
565  * naturally aligned. They may be implemented using MMX,
566  * so emms_c() must be called before using any float code
567  * afterwards.
568  */
569 
570 #define AV_COPY(n, d, s) \
571  (((av_alias##n*)(d))->u##n = ((const av_alias##n*)(s))->u##n)
572 
573 #ifndef AV_COPY16
574 # define AV_COPY16(d, s) AV_COPY(16, d, s)
575 #endif
576 
577 #ifndef AV_COPY32
578 # define AV_COPY32(d, s) AV_COPY(32, d, s)
579 #endif
580 
581 #ifndef AV_COPY64
582 # define AV_COPY64(d, s) AV_COPY(64, d, s)
583 #endif
584 
585 #ifndef AV_COPY128
586 # define AV_COPY128(d, s) \
587  do { \
588  AV_COPY64(d, s); \
589  AV_COPY64((char*)(d)+8, (char*)(s)+8); \
590  } while(0)
591 #endif
592 
593 #define AV_SWAP(n, a, b) FFSWAP(av_alias##n, *(av_alias##n*)(a), *(av_alias##n*)(b))
594 
595 #ifndef AV_SWAP64
596 # define AV_SWAP64(a, b) AV_SWAP(64, a, b)
597 #endif
598 
599 #define AV_ZERO(n, d) (((av_alias##n*)(d))->u##n = 0)
600 
601 #ifndef AV_ZERO16
602 # define AV_ZERO16(d) AV_ZERO(16, d)
603 #endif
604 
605 #ifndef AV_ZERO32
606 # define AV_ZERO32(d) AV_ZERO(32, d)
607 #endif
608 
609 #ifndef AV_ZERO64
610 # define AV_ZERO64(d) AV_ZERO(64, d)
611 #endif
612 
613 #ifndef AV_ZERO128
614 # define AV_ZERO128(d) \
615  do { \
616  AV_ZERO64(d); \
617  AV_ZERO64((char*)(d)+8); \
618  } while(0)
619 #endif
620 
621 #endif /* AVUTIL_INTREADWRITE_H */
attributes.h
Macro definitions for various function/variable attributes.
__attribute__
static const float even_table[] __attribute__((aligned(8)))
uint8_t
uint8_t
Definition: audio_convert.c:194
av_alias
#define av_alias
Definition: attributes.h:131
av_alias
Definition: intreadwrite.h:27
av_alias::u64
uint64_t u64
Definition: intreadwrite.h:28
bswap.h
byte swapping routines
av_alias::f64
double f64
Definition: intreadwrite.h:32
Generated on Mon Nov 18 2024 06:51:56 for FFmpeg by   doxygen 1.8.11