FFmpeg
common.h
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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 
45 //rounded division & shift
46 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
47 /* assume b>0 */
48 #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
49 /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
50 #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
51  : ((a) + (1<<(b)) - 1) >> (b))
52 /* Backwards compat. */
53 #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
54 
55 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
56 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
57 
58 /**
59  * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
60  * are not representable as absolute values of their type. This is the same
61  * as with *abs()
62  * @see FFNABS()
63  */
64 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
65 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
66 
67 /**
68  * Negative Absolute value.
69  * this works for all integers of all types.
70  * As with many macros, this evaluates its argument twice, it thus must not have
71  * a sideeffect, that is FFNABS(x++) has undefined behavior.
72  */
73 #define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
74 
75 /**
76  * Unsigned Absolute value.
77  * This takes the absolute value of a signed int and returns it as a unsigned.
78  * This also works with INT_MIN which would otherwise not be representable
79  * As with many macros, this evaluates its argument twice.
80  */
81 #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))
82 #define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a))
83 
84 /* misc math functions */
85 
86 #ifdef HAVE_AV_CONFIG_H
87 # include "config.h"
88 # include "intmath.h"
89 #endif
90 
91 #ifndef av_ceil_log2
92 # define av_ceil_log2 av_ceil_log2_c
93 #endif
94 #ifndef av_clip
95 # define av_clip av_clip_c
96 #endif
97 #ifndef av_clip64
98 # define av_clip64 av_clip64_c
99 #endif
100 #ifndef av_clip_uint8
101 # define av_clip_uint8 av_clip_uint8_c
102 #endif
103 #ifndef av_clip_int8
104 # define av_clip_int8 av_clip_int8_c
105 #endif
106 #ifndef av_clip_uint16
107 # define av_clip_uint16 av_clip_uint16_c
108 #endif
109 #ifndef av_clip_int16
110 # define av_clip_int16 av_clip_int16_c
111 #endif
112 #ifndef av_clipl_int32
113 # define av_clipl_int32 av_clipl_int32_c
114 #endif
115 #ifndef av_clip_intp2
116 # define av_clip_intp2 av_clip_intp2_c
117 #endif
118 #ifndef av_clip_uintp2
119 # define av_clip_uintp2 av_clip_uintp2_c
120 #endif
121 #ifndef av_mod_uintp2
122 # define av_mod_uintp2 av_mod_uintp2_c
123 #endif
124 #ifndef av_sat_add32
125 # define av_sat_add32 av_sat_add32_c
126 #endif
127 #ifndef av_sat_dadd32
128 # define av_sat_dadd32 av_sat_dadd32_c
129 #endif
130 #ifndef av_sat_sub32
131 # define av_sat_sub32 av_sat_sub32_c
132 #endif
133 #ifndef av_sat_dsub32
134 # define av_sat_dsub32 av_sat_dsub32_c
135 #endif
136 #ifndef av_sat_add64
137 # define av_sat_add64 av_sat_add64_c
138 #endif
139 #ifndef av_sat_sub64
140 # define av_sat_sub64 av_sat_sub64_c
141 #endif
142 #ifndef av_clipf
143 # define av_clipf av_clipf_c
144 #endif
145 #ifndef av_clipd
146 # define av_clipd av_clipd_c
147 #endif
148 #ifndef av_popcount
149 # define av_popcount av_popcount_c
150 #endif
151 #ifndef av_popcount64
152 # define av_popcount64 av_popcount64_c
153 #endif
154 #ifndef av_parity
155 # define av_parity av_parity_c
156 #endif
157 
158 #ifndef av_log2
159 av_const int av_log2(unsigned v);
160 #endif
161 
162 #ifndef av_log2_16bit
163 av_const int av_log2_16bit(unsigned v);
164 #endif
165 
166 /**
167  * Clip a signed integer value into the amin-amax range.
168  * @param a value to clip
169  * @param amin minimum value of the clip range
170  * @param amax maximum value of the clip range
171  * @return clipped value
172  */
173 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
174 {
175 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
176  if (amin > amax) abort();
177 #endif
178  if (a < amin) return amin;
179  else if (a > amax) return amax;
180  else return a;
181 }
182 
183 /**
184  * Clip a signed 64bit integer value into the amin-amax range.
185  * @param a value to clip
186  * @param amin minimum value of the clip range
187  * @param amax maximum value of the clip range
188  * @return clipped value
189  */
190 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
191 {
192 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
193  if (amin > amax) abort();
194 #endif
195  if (a < amin) return amin;
196  else if (a > amax) return amax;
197  else return a;
198 }
199 
200 /**
201  * Clip a signed integer value into the 0-255 range.
202  * @param a value to clip
203  * @return clipped value
204  */
206 {
207  if (a&(~0xFF)) return (~a)>>31;
208  else return a;
209 }
210 
211 /**
212  * Clip a signed integer value into the -128,127 range.
213  * @param a value to clip
214  * @return clipped value
215  */
217 {
218  if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
219  else return a;
220 }
221 
222 /**
223  * Clip a signed integer value into the 0-65535 range.
224  * @param a value to clip
225  * @return clipped value
226  */
228 {
229  if (a&(~0xFFFF)) return (~a)>>31;
230  else return a;
231 }
232 
233 /**
234  * Clip a signed integer value into the -32768,32767 range.
235  * @param a value to clip
236  * @return clipped value
237  */
239 {
240  if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
241  else return a;
242 }
243 
244 /**
245  * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
246  * @param a value to clip
247  * @return clipped value
248  */
250 {
251  if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
252  else return (int32_t)a;
253 }
254 
255 /**
256  * Clip a signed integer into the -(2^p),(2^p-1) range.
257  * @param a value to clip
258  * @param p bit position to clip at
259  * @return clipped value
260  */
262 {
263  if (((unsigned)a + (1 << p)) & ~((2 << p) - 1))
264  return (a >> 31) ^ ((1 << p) - 1);
265  else
266  return a;
267 }
268 
269 /**
270  * Clip a signed integer to an unsigned power of two range.
271  * @param a value to clip
272  * @param p bit position to clip at
273  * @return clipped value
274  */
275 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
276 {
277  if (a & ~((1<<p) - 1)) return (~a) >> 31 & ((1<<p) - 1);
278  else return a;
279 }
280 
281 /**
282  * Clear high bits from an unsigned integer starting with specific bit position
283  * @param a value to clip
284  * @param p bit position to clip at
285  * @return clipped value
286  */
287 static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
288 {
289  return a & ((1U << p) - 1);
290 }
291 
292 /**
293  * Add two signed 32-bit values with saturation.
294  *
295  * @param a one value
296  * @param b another value
297  * @return sum with signed saturation
298  */
299 static av_always_inline int av_sat_add32_c(int a, int b)
300 {
301  return av_clipl_int32((int64_t)a + b);
302 }
303 
304 /**
305  * Add a doubled value to another value with saturation at both stages.
306  *
307  * @param a first value
308  * @param b value doubled and added to a
309  * @return sum sat(a + sat(2*b)) with signed saturation
310  */
311 static av_always_inline int av_sat_dadd32_c(int a, int b)
312 {
313  return av_sat_add32(a, av_sat_add32(b, b));
314 }
315 
316 /**
317  * Subtract two signed 32-bit values with saturation.
318  *
319  * @param a one value
320  * @param b another value
321  * @return difference with signed saturation
322  */
323 static av_always_inline int av_sat_sub32_c(int a, int b)
324 {
325  return av_clipl_int32((int64_t)a - b);
326 }
327 
328 /**
329  * Subtract a doubled value from another value with saturation at both stages.
330  *
331  * @param a first value
332  * @param b value doubled and subtracted from a
333  * @return difference sat(a - sat(2*b)) with signed saturation
334  */
335 static av_always_inline int av_sat_dsub32_c(int a, int b)
336 {
337  return av_sat_sub32(a, av_sat_add32(b, b));
338 }
339 
340 /**
341  * Add two signed 64-bit values with saturation.
342  *
343  * @param a one value
344  * @param b another value
345  * @return sum with signed saturation
346  */
347 static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
348 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
349  int64_t tmp;
350  return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
351 #else
352  int64_t s = a+(uint64_t)b;
353  if ((int64_t)(a^b | ~s^b) >= 0)
354  return INT64_MAX ^ (b >> 63);
355  return s;
356 #endif
357 }
358 
359 /**
360  * Subtract two signed 64-bit values with saturation.
361  *
362  * @param a one value
363  * @param b another value
364  * @return difference with signed saturation
365  */
366 static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
367 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
368  int64_t tmp;
369  return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
370 #else
371  if (b <= 0 && a >= INT64_MAX + b)
372  return INT64_MAX;
373  if (b >= 0 && a <= INT64_MIN + b)
374  return INT64_MIN;
375  return a - b;
376 #endif
377 }
378 
379 /**
380  * Clip a float value into the amin-amax range.
381  * If a is nan or -inf amin will be returned.
382  * If a is +inf amax will be returned.
383  * @param a value to clip
384  * @param amin minimum value of the clip range
385  * @param amax maximum value of the clip range
386  * @return clipped value
387  */
388 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
389 {
390 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
391  if (amin > amax) abort();
392 #endif
393  return FFMIN(FFMAX(a, amin), amax);
394 }
395 
396 /**
397  * Clip a double value into the amin-amax range.
398  * If a is nan or -inf amin will be returned.
399  * If a is +inf amax will be returned.
400  * @param a value to clip
401  * @param amin minimum value of the clip range
402  * @param amax maximum value of the clip range
403  * @return clipped value
404  */
405 static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
406 {
407 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
408  if (amin > amax) abort();
409 #endif
410  return FFMIN(FFMAX(a, amin), amax);
411 }
412 
413 /** Compute ceil(log2(x)).
414  * @param x value used to compute ceil(log2(x))
415  * @return computed ceiling of log2(x)
416  */
418 {
419  return av_log2((x - 1U) << 1);
420 }
421 
422 /**
423  * Count number of bits set to one in x
424  * @param x value to count bits of
425  * @return the number of bits set to one in x
426  */
428 {
429  x -= (x >> 1) & 0x55555555;
430  x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
431  x = (x + (x >> 4)) & 0x0F0F0F0F;
432  x += x >> 8;
433  return (x + (x >> 16)) & 0x3F;
434 }
435 
436 /**
437  * Count number of bits set to one in x
438  * @param x value to count bits of
439  * @return the number of bits set to one in x
440  */
442 {
443  return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
444 }
445 
446 static av_always_inline av_const int av_parity_c(uint32_t v)
447 {
448  return av_popcount(v) & 1;
449 }
450 
451 /**
452  * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
453  *
454  * @param val Output value, must be an lvalue of type uint32_t.
455  * @param GET_BYTE Expression reading one byte from the input.
456  * Evaluated up to 7 times (4 for the currently
457  * assigned Unicode range). With a memory buffer
458  * input, this could be *ptr++, or if you want to make sure
459  * that *ptr stops at the end of a NULL terminated string then
460  * *ptr ? *ptr++ : 0
461  * @param ERROR Expression to be evaluated on invalid input,
462  * typically a goto statement.
463  *
464  * @warning ERROR should not contain a loop control statement which
465  * could interact with the internal while loop, and should force an
466  * exit from the macro code (e.g. through a goto or a return) in order
467  * to prevent undefined results.
468  */
469 #define GET_UTF8(val, GET_BYTE, ERROR)\
470  val= (GET_BYTE);\
471  {\
472  uint32_t top = (val & 128) >> 1;\
473  if ((val & 0xc0) == 0x80 || val >= 0xFE)\
474  {ERROR}\
475  while (val & top) {\
476  unsigned int tmp = (GET_BYTE) - 128;\
477  if(tmp>>6)\
478  {ERROR}\
479  val= (val<<6) + tmp;\
480  top <<= 5;\
481  }\
482  val &= (top << 1) - 1;\
483  }
484 
485 /**
486  * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
487  *
488  * @param val Output value, must be an lvalue of type uint32_t.
489  * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
490  * to native byte order. Evaluated one or two times.
491  * @param ERROR Expression to be evaluated on invalid input,
492  * typically a goto statement.
493  */
494 #define GET_UTF16(val, GET_16BIT, ERROR)\
495  val = (GET_16BIT);\
496  {\
497  unsigned int hi = val - 0xD800;\
498  if (hi < 0x800) {\
499  val = (GET_16BIT) - 0xDC00;\
500  if (val > 0x3FFU || hi > 0x3FFU)\
501  {ERROR}\
502  val += (hi<<10) + 0x10000;\
503  }\
504  }\
505 
506 /**
507  * @def PUT_UTF8(val, tmp, PUT_BYTE)
508  * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
509  * @param val is an input-only argument and should be of type uint32_t. It holds
510  * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
511  * val is given as a function it is executed only once.
512  * @param tmp is a temporary variable and should be of type uint8_t. It
513  * represents an intermediate value during conversion that is to be
514  * output by PUT_BYTE.
515  * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
516  * It could be a function or a statement, and uses tmp as the input byte.
517  * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
518  * executed up to 4 times for values in the valid UTF-8 range and up to
519  * 7 times in the general case, depending on the length of the converted
520  * Unicode character.
521  */
522 #define PUT_UTF8(val, tmp, PUT_BYTE)\
523  {\
524  int bytes, shift;\
525  uint32_t in = val;\
526  if (in < 0x80) {\
527  tmp = in;\
528  PUT_BYTE\
529  } else {\
530  bytes = (av_log2(in) + 4) / 5;\
531  shift = (bytes - 1) * 6;\
532  tmp = (256 - (256 >> bytes)) | (in >> shift);\
533  PUT_BYTE\
534  while (shift >= 6) {\
535  shift -= 6;\
536  tmp = 0x80 | ((in >> shift) & 0x3f);\
537  PUT_BYTE\
538  }\
539  }\
540  }
541 
542 /**
543  * @def PUT_UTF16(val, tmp, PUT_16BIT)
544  * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
545  * @param val is an input-only argument and should be of type uint32_t. It holds
546  * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
547  * val is given as a function it is executed only once.
548  * @param tmp is a temporary variable and should be of type uint16_t. It
549  * represents an intermediate value during conversion that is to be
550  * output by PUT_16BIT.
551  * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
552  * in desired endianness. It could be a function or a statement, and uses tmp
553  * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
554  * PUT_BYTE will be executed 1 or 2 times depending on input character.
555  */
556 #define PUT_UTF16(val, tmp, PUT_16BIT)\
557  {\
558  uint32_t in = val;\
559  if (in < 0x10000) {\
560  tmp = in;\
561  PUT_16BIT\
562  } else {\
563  tmp = 0xD800 | ((in - 0x10000) >> 10);\
564  PUT_16BIT\
565  tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
566  PUT_16BIT\
567  }\
568  }\
569 
570 
571 
572 #include "mem.h"
573 
574 #ifdef HAVE_AV_CONFIG_H
575 # include "internal.h"
576 #endif /* HAVE_AV_CONFIG_H */
577 
578 #endif /* AVUTIL_COMMON_H */
av_mod_uintp2_c
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:287
av_log2_16bit
int av_log2_16bit(unsigned v)
Definition: intmath.c:31
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
av_clip_uintp2_c
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:275
av_sat_sub32_c
static av_always_inline int av_sat_sub32_c(int a, int b)
Subtract two signed 32-bit values with saturation.
Definition: common.h:323
av_const
#define av_const
Definition: attributes.h:84
b
#define b
Definition: input.c:34
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
av_popcount
#define av_popcount
Definition: common.h:149
av_clip_uint16_c
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:227
av_clip_uint8_c
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:205
av_sat_dadd32_c
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:311
av_clip64_c
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:190
macros.h
s
#define s(width, name)
Definition: cbs_vp9.c:256
limits.h
av_sat_sub32
#define av_sat_sub32
Definition: common.h:131
av_clipf_c
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:388
av_clipd_c
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:405
av_clip_intp2_c
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:261
av_sat_add32
#define av_sat_add32
Definition: common.h:125
av_clip_c
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:173
av_clipl_int32
#define av_clipl_int32
Definition: common.h:113
a
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:41
attributes.h
internal.h
av_clipl_int32_c
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:249
av_always_inline
#define av_always_inline
Definition: attributes.h:49
av_popcount_c
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:427
FFMIN
#define FFMIN(a, b)
Definition: macros.h:49
av_sat_add32_c
static av_always_inline int av_sat_add32_c(int a, int b)
Add two signed 32-bit values with saturation.
Definition: common.h:299
av_popcount64_c
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:441
U
#define U(x)
Definition: vpx_arith.h:37
mem.h
av_sat_add64_c
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:347
av_clip_int16_c
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:238
av_sat_sub64_c
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:366
int32_t
int32_t
Definition: audioconvert.c:56
av_sat_dsub32_c
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:335
av_parity_c
static av_always_inline av_const int av_parity_c(uint32_t v)
Definition: common.h:446
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
av_ceil_log2_c
static av_always_inline av_const int av_ceil_log2_c(int x)
Compute ceil(log2(x)).
Definition: common.h:417
av_clip_int8_c
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:216
intmath.h