FFmpeg
common.h
Go to the documentation of this file.
1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 /**
22  * @file
23  * common internal and external API header
24  */
25 
26 #ifndef AVUTIL_COMMON_H
27 #define AVUTIL_COMMON_H
28 
29 #if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
30 #error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
31 #endif
32 
33 #include <errno.h>
34 #include <inttypes.h>
35 #include <limits.h>
36 #include <math.h>
37 #include <stdint.h>
38 #include <stdio.h>
39 #include <stdlib.h>
40 #include <string.h>
41 
42 #include "attributes.h"
43 #include "macros.h"
44 #include "version.h"
45 #include "libavutil/avconfig.h"
46 
47 #if AV_HAVE_BIGENDIAN
48 # define AV_NE(be, le) (be)
49 #else
50 # define AV_NE(be, le) (le)
51 #endif
52 
53 //rounded division & shift
54 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
55 /* assume b>0 */
56 #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
57 /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
58 #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
59  : ((a) + (1<<(b)) - 1) >> (b))
60 /* Backwards compat. */
61 #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
62 
63 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
64 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
65 
66 /**
67  * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
68  * are not representable as absolute values of their type. This is the same
69  * as with *abs()
70  * @see FFNABS()
71  */
72 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
73 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
74 
75 /**
76  * Negative Absolute value.
77  * this works for all integers of all types.
78  * As with many macros, this evaluates its argument twice, it thus must not have
79  * a sideeffect, that is FFNABS(x++) has undefined behavior.
80  */
81 #define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
82 
83 /**
84  * Unsigned Absolute value.
85  * This takes the absolute value of a signed int and returns it as a unsigned.
86  * This also works with INT_MIN which would otherwise not be representable
87  * As with many macros, this evaluates its argument twice.
88  */
89 #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))
90 
91 /**
92  * Comparator.
93  * For two numerical expressions x and y, gives 1 if x > y, -1 if x < y, and 0
94  * if x == y. This is useful for instance in a qsort comparator callback.
95  * Furthermore, compilers are able to optimize this to branchless code, and
96  * there is no risk of overflow with signed types.
97  * As with many macros, this evaluates its argument multiple times, it thus
98  * must not have a side-effect.
99  */
100 #define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))
101 
102 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
103 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
104 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
105 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
106 
107 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
108 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
109 
110 /* misc math functions */
111 
112 #ifdef HAVE_AV_CONFIG_H
113 # include "config.h"
114 # include "intmath.h"
115 #endif
116 
117 /* Pull in unguarded fallback defines at the end of this file. */
118 #include "common.h"
119 
120 #ifndef av_log2
121 av_const int av_log2(unsigned v);
122 #endif
123 
124 #ifndef av_log2_16bit
125 av_const int av_log2_16bit(unsigned v);
126 #endif
127 
128 /**
129  * Clip a signed integer value into the amin-amax range.
130  * @param a value to clip
131  * @param amin minimum value of the clip range
132  * @param amax maximum value of the clip range
133  * @return clipped value
134  */
135 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
136 {
137 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
138  if (amin > amax) abort();
139 #endif
140  if (a < amin) return amin;
141  else if (a > amax) return amax;
142  else return a;
143 }
144 
145 /**
146  * Clip a signed 64bit integer value into the amin-amax range.
147  * @param a value to clip
148  * @param amin minimum value of the clip range
149  * @param amax maximum value of the clip range
150  * @return clipped value
151  */
152 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
153 {
154 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
155  if (amin > amax) abort();
156 #endif
157  if (a < amin) return amin;
158  else if (a > amax) return amax;
159  else return a;
160 }
161 
162 /**
163  * Clip a signed integer value into the 0-255 range.
164  * @param a value to clip
165  * @return clipped value
166  */
168 {
169  if (a&(~0xFF)) return (~a)>>31;
170  else return a;
171 }
172 
173 /**
174  * Clip a signed integer value into the -128,127 range.
175  * @param a value to clip
176  * @return clipped value
177  */
179 {
180  if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
181  else return a;
182 }
183 
184 /**
185  * Clip a signed integer value into the 0-65535 range.
186  * @param a value to clip
187  * @return clipped value
188  */
190 {
191  if (a&(~0xFFFF)) return (~a)>>31;
192  else return a;
193 }
194 
195 /**
196  * Clip a signed integer value into the -32768,32767 range.
197  * @param a value to clip
198  * @return clipped value
199  */
201 {
202  if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
203  else return a;
204 }
205 
206 /**
207  * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
208  * @param a value to clip
209  * @return clipped value
210  */
212 {
213  if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
214  else return (int32_t)a;
215 }
216 
217 /**
218  * Clip a signed integer into the -(2^p),(2^p-1) range.
219  * @param a value to clip
220  * @param p bit position to clip at
221  * @return clipped value
222  */
224 {
225  if (((unsigned)a + (1 << p)) & ~((2 << p) - 1))
226  return (a >> 31) ^ ((1 << p) - 1);
227  else
228  return a;
229 }
230 
231 /**
232  * Clip a signed integer to an unsigned power of two range.
233  * @param a value to clip
234  * @param p bit position to clip at
235  * @return clipped value
236  */
237 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
238 {
239  if (a & ~((1<<p) - 1)) return (~a) >> 31 & ((1<<p) - 1);
240  else return a;
241 }
242 
243 /**
244  * Clear high bits from an unsigned integer starting with specific bit position
245  * @param a value to clip
246  * @param p bit position to clip at
247  * @return clipped value
248  */
249 static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
250 {
251  return a & ((1U << p) - 1);
252 }
253 
254 /**
255  * Add two signed 32-bit values with saturation.
256  *
257  * @param a one value
258  * @param b another value
259  * @return sum with signed saturation
260  */
261 static av_always_inline int av_sat_add32_c(int a, int b)
262 {
263  return av_clipl_int32((int64_t)a + b);
264 }
265 
266 /**
267  * Add a doubled value to another value with saturation at both stages.
268  *
269  * @param a first value
270  * @param b value doubled and added to a
271  * @return sum sat(a + sat(2*b)) with signed saturation
272  */
273 static av_always_inline int av_sat_dadd32_c(int a, int b)
274 {
275  return av_sat_add32(a, av_sat_add32(b, b));
276 }
277 
278 /**
279  * Subtract two signed 32-bit values with saturation.
280  *
281  * @param a one value
282  * @param b another value
283  * @return difference with signed saturation
284  */
285 static av_always_inline int av_sat_sub32_c(int a, int b)
286 {
287  return av_clipl_int32((int64_t)a - b);
288 }
289 
290 /**
291  * Subtract a doubled value from another value with saturation at both stages.
292  *
293  * @param a first value
294  * @param b value doubled and subtracted from a
295  * @return difference sat(a - sat(2*b)) with signed saturation
296  */
297 static av_always_inline int av_sat_dsub32_c(int a, int b)
298 {
299  return av_sat_sub32(a, av_sat_add32(b, b));
300 }
301 
302 /**
303  * Add two signed 64-bit values with saturation.
304  *
305  * @param a one value
306  * @param b another value
307  * @return sum with signed saturation
308  */
309 static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
310 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
311  int64_t tmp;
312  return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
313 #else
314  int64_t s = a+(uint64_t)b;
315  if ((int64_t)(a^b | ~s^b) >= 0)
316  return INT64_MAX ^ (b >> 63);
317  return s;
318 #endif
319 }
320 
321 /**
322  * Subtract two signed 64-bit values with saturation.
323  *
324  * @param a one value
325  * @param b another value
326  * @return difference with signed saturation
327  */
328 static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
329 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
330  int64_t tmp;
331  return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
332 #else
333  if (b <= 0 && a >= INT64_MAX + b)
334  return INT64_MAX;
335  if (b >= 0 && a <= INT64_MIN + b)
336  return INT64_MIN;
337  return a - b;
338 #endif
339 }
340 
341 /**
342  * Clip a float value into the amin-amax range.
343  * @param a value to clip
344  * @param amin minimum value of the clip range
345  * @param amax maximum value of the clip range
346  * @return clipped value
347  */
348 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
349 {
350 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
351  if (amin > amax) abort();
352 #endif
353  if (a < amin) return amin;
354  else if (a > amax) return amax;
355  else return a;
356 }
357 
358 /**
359  * Clip a double value into the amin-amax range.
360  * @param a value to clip
361  * @param amin minimum value of the clip range
362  * @param amax maximum value of the clip range
363  * @return clipped value
364  */
365 static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
366 {
367 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
368  if (amin > amax) abort();
369 #endif
370  if (a < amin) return amin;
371  else if (a > amax) return amax;
372  else return a;
373 }
374 
375 /** Compute ceil(log2(x)).
376  * @param x value used to compute ceil(log2(x))
377  * @return computed ceiling of log2(x)
378  */
380 {
381  return av_log2((x - 1U) << 1);
382 }
383 
384 /**
385  * Count number of bits set to one in x
386  * @param x value to count bits of
387  * @return the number of bits set to one in x
388  */
390 {
391  x -= (x >> 1) & 0x55555555;
392  x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
393  x = (x + (x >> 4)) & 0x0F0F0F0F;
394  x += x >> 8;
395  return (x + (x >> 16)) & 0x3F;
396 }
397 
398 /**
399  * Count number of bits set to one in x
400  * @param x value to count bits of
401  * @return the number of bits set to one in x
402  */
404 {
405  return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
406 }
407 
408 static av_always_inline av_const int av_parity_c(uint32_t v)
409 {
410  return av_popcount(v) & 1;
411 }
412 
413 #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
414 #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
415 
416 /**
417  * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
418  *
419  * @param val Output value, must be an lvalue of type uint32_t.
420  * @param GET_BYTE Expression reading one byte from the input.
421  * Evaluated up to 7 times (4 for the currently
422  * assigned Unicode range). With a memory buffer
423  * input, this could be *ptr++, or if you want to make sure
424  * that *ptr stops at the end of a NULL terminated string then
425  * *ptr ? *ptr++ : 0
426  * @param ERROR Expression to be evaluated on invalid input,
427  * typically a goto statement.
428  *
429  * @warning ERROR should not contain a loop control statement which
430  * could interact with the internal while loop, and should force an
431  * exit from the macro code (e.g. through a goto or a return) in order
432  * to prevent undefined results.
433  */
434 #define GET_UTF8(val, GET_BYTE, ERROR)\
435  val= (GET_BYTE);\
436  {\
437  uint32_t top = (val & 128) >> 1;\
438  if ((val & 0xc0) == 0x80 || val >= 0xFE)\
439  {ERROR}\
440  while (val & top) {\
441  unsigned int tmp = (GET_BYTE) - 128;\
442  if(tmp>>6)\
443  {ERROR}\
444  val= (val<<6) + tmp;\
445  top <<= 5;\
446  }\
447  val &= (top << 1) - 1;\
448  }
449 
450 /**
451  * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
452  *
453  * @param val Output value, must be an lvalue of type uint32_t.
454  * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
455  * to native byte order. Evaluated one or two times.
456  * @param ERROR Expression to be evaluated on invalid input,
457  * typically a goto statement.
458  */
459 #define GET_UTF16(val, GET_16BIT, ERROR)\
460  val = (GET_16BIT);\
461  {\
462  unsigned int hi = val - 0xD800;\
463  if (hi < 0x800) {\
464  val = (GET_16BIT) - 0xDC00;\
465  if (val > 0x3FFU || hi > 0x3FFU)\
466  {ERROR}\
467  val += (hi<<10) + 0x10000;\
468  }\
469  }\
470 
471 /**
472  * @def PUT_UTF8(val, tmp, PUT_BYTE)
473  * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
474  * @param val is an input-only argument and should be of type uint32_t. It holds
475  * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
476  * val is given as a function it is executed only once.
477  * @param tmp is a temporary variable and should be of type uint8_t. It
478  * represents an intermediate value during conversion that is to be
479  * output by PUT_BYTE.
480  * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
481  * It could be a function or a statement, and uses tmp as the input byte.
482  * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
483  * executed up to 4 times for values in the valid UTF-8 range and up to
484  * 7 times in the general case, depending on the length of the converted
485  * Unicode character.
486  */
487 #define PUT_UTF8(val, tmp, PUT_BYTE)\
488  {\
489  int bytes, shift;\
490  uint32_t in = val;\
491  if (in < 0x80) {\
492  tmp = in;\
493  PUT_BYTE\
494  } else {\
495  bytes = (av_log2(in) + 4) / 5;\
496  shift = (bytes - 1) * 6;\
497  tmp = (256 - (256 >> bytes)) | (in >> shift);\
498  PUT_BYTE\
499  while (shift >= 6) {\
500  shift -= 6;\
501  tmp = 0x80 | ((in >> shift) & 0x3f);\
502  PUT_BYTE\
503  }\
504  }\
505  }
506 
507 /**
508  * @def PUT_UTF16(val, tmp, PUT_16BIT)
509  * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
510  * @param val is an input-only argument and should be of type uint32_t. It holds
511  * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
512  * val is given as a function it is executed only once.
513  * @param tmp is a temporary variable and should be of type uint16_t. It
514  * represents an intermediate value during conversion that is to be
515  * output by PUT_16BIT.
516  * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
517  * in desired endianness. It could be a function or a statement, and uses tmp
518  * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
519  * PUT_BYTE will be executed 1 or 2 times depending on input character.
520  */
521 #define PUT_UTF16(val, tmp, PUT_16BIT)\
522  {\
523  uint32_t in = val;\
524  if (in < 0x10000) {\
525  tmp = in;\
526  PUT_16BIT\
527  } else {\
528  tmp = 0xD800 | ((in - 0x10000) >> 10);\
529  PUT_16BIT\
530  tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
531  PUT_16BIT\
532  }\
533  }\
534 
535 
536 
537 #include "mem.h"
538 
539 #ifdef HAVE_AV_CONFIG_H
540 # include "internal.h"
541 #endif /* HAVE_AV_CONFIG_H */
542 
543 #endif /* AVUTIL_COMMON_H */
544 
545 /*
546  * The following definitions are outside the multiple inclusion guard
547  * to ensure they are immediately available in intmath.h.
548  */
549 
550 #ifndef av_ceil_log2
551 # define av_ceil_log2 av_ceil_log2_c
552 #endif
553 #ifndef av_clip
554 # define av_clip av_clip_c
555 #endif
556 #ifndef av_clip64
557 # define av_clip64 av_clip64_c
558 #endif
559 #ifndef av_clip_uint8
560 # define av_clip_uint8 av_clip_uint8_c
561 #endif
562 #ifndef av_clip_int8
563 # define av_clip_int8 av_clip_int8_c
564 #endif
565 #ifndef av_clip_uint16
566 # define av_clip_uint16 av_clip_uint16_c
567 #endif
568 #ifndef av_clip_int16
569 # define av_clip_int16 av_clip_int16_c
570 #endif
571 #ifndef av_clipl_int32
572 # define av_clipl_int32 av_clipl_int32_c
573 #endif
574 #ifndef av_clip_intp2
575 # define av_clip_intp2 av_clip_intp2_c
576 #endif
577 #ifndef av_clip_uintp2
578 # define av_clip_uintp2 av_clip_uintp2_c
579 #endif
580 #ifndef av_mod_uintp2
581 # define av_mod_uintp2 av_mod_uintp2_c
582 #endif
583 #ifndef av_sat_add32
584 # define av_sat_add32 av_sat_add32_c
585 #endif
586 #ifndef av_sat_dadd32
587 # define av_sat_dadd32 av_sat_dadd32_c
588 #endif
589 #ifndef av_sat_sub32
590 # define av_sat_sub32 av_sat_sub32_c
591 #endif
592 #ifndef av_sat_dsub32
593 # define av_sat_dsub32 av_sat_dsub32_c
594 #endif
595 #ifndef av_sat_add64
596 # define av_sat_add64 av_sat_add64_c
597 #endif
598 #ifndef av_sat_sub64
599 # define av_sat_sub64 av_sat_sub64_c
600 #endif
601 #ifndef av_clipf
602 # define av_clipf av_clipf_c
603 #endif
604 #ifndef av_clipd
605 # define av_clipd av_clipd_c
606 #endif
607 #ifndef av_popcount
608 # define av_popcount av_popcount_c
609 #endif
610 #ifndef av_popcount64
611 # define av_popcount64 av_popcount64_c
612 #endif
613 #ifndef av_parity
614 # define av_parity av_parity_c
615 #endif
#define av_const
Definition: attributes.h:82
static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
Definition: common.h:211
static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
Clip a float value into the amin-amax range.
Definition: common.h:348
static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
Clear high bits from an unsigned integer starting with specific bit position.
Definition: common.h:249
Memory handling functions.
static av_always_inline int av_sat_sub32_c(int a, int b)
Subtract two signed 32-bit values with saturation.
Definition: common.h:285
int av_log2(unsigned v)
Definition: intmath.c:26
static av_always_inline av_const int8_t av_clip_int8_c(int a)
Clip a signed integer value into the -128,127 range.
Definition: common.h:178
The reader does not expect b to be semantically here and if the code is changed by maybe adding a a division or other the signedness will almost certainly be mistaken To avoid this confusion a new type was SUINT is the C unsigned type but it holds a signed int to use the same example SUINT a
Definition: undefined.txt:36
int av_log2_16bit(unsigned v)
Definition: intmath.c:31
Macro definitions for various function/variable attributes.
static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b)
Add two signed 64-bit values with saturation.
Definition: common.h:309
uint8_t
static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b)
Subtract two signed 64-bit values with saturation.
Definition: common.h:328
static av_always_inline int av_sat_dsub32_c(int a, int b)
Subtract a doubled value from another value with saturation at both stages.
Definition: common.h:297
Utility Preprocessor macros.
#define U(x)
Definition: vp56_arith.h:37
static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
Clip a signed integer value into the amin-amax range.
Definition: common.h:135
Libavutil version macros.
static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
Clip a signed integer value into the 0-65535 range.
Definition: common.h:189
static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
Clip a signed integer value into the 0-255 range.
Definition: common.h:167
common internal API header
#define b
Definition: input.c:41
int32_t
#define s(width, name)
Definition: cbs_vp9.c:257
static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
Clip a double value into the amin-amax range.
Definition: common.h:365
static av_always_inline av_const int av_clip_intp2_c(int a, int p)
Clip a signed integer into the -(2^p),(2^p-1) range.
Definition: common.h:223
static av_always_inline av_const int16_t av_clip_int16_c(int a)
Clip a signed integer value into the -32768,32767 range.
Definition: common.h:200
common internal and external API header
static av_always_inline av_const int av_popcount_c(uint32_t x)
Count number of bits set to one in x.
Definition: common.h:389
static av_always_inline int av_sat_add32_c(int a, int b)
Add two signed 32-bit values with saturation.
Definition: common.h:261
static av_always_inline av_const int av_popcount64_c(uint64_t x)
Count number of bits set to one in x.
Definition: common.h:403
static av_always_inline av_const int av_parity_c(uint32_t v)
Definition: common.h:408
static av_always_inline int av_sat_dadd32_c(int a, int b)
Add a doubled value to another value with saturation at both stages.
Definition: common.h:273
#define av_always_inline
Definition: attributes.h:45
static av_always_inline av_const int av_ceil_log2_c(int x)
Compute ceil(log2(x)).
Definition: common.h:379
static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
Clip a signed 64bit integer value into the amin-amax range.
Definition: common.h:152
static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
Clip a signed integer to an unsigned power of two range.
Definition: common.h:237
static uint8_t tmp[11]
Definition: aes_ctr.c:27