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 #include "version.h"
45 
46 //rounded division & shift
47 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
48 /* assume b>0 */
49 #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
50 /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */
51 #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
52  : ((a) + (1<<(b)) - 1) >> (b))
53 /* Backwards compat. */
54 #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
55 
56 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
57 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
58 
59 /**
60  * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they
61  * are not representable as absolute values of their type. This is the same
62  * as with *abs()
63  * @see FFNABS()
64  */
65 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
66 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
67 
68 /**
69  * Negative Absolute value.
70  * this works for all integers of all types.
71  * As with many macros, this evaluates its argument twice, it thus must not have
72  * a sideeffect, that is FFNABS(x++) has undefined behavior.
73  */
74 #define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
75 
76 /**
77  * Unsigned Absolute value.
78  * This takes the absolute value of a signed int and returns it as a unsigned.
79  * This also works with INT_MIN which would otherwise not be representable
80  * As with many macros, this evaluates its argument twice.
81  */
82 #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))
83 #define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a))
84 
85 /* misc math functions */
86 
87 #ifdef HAVE_AV_CONFIG_H
88 # include "config.h"
89 # include "intmath.h"
90 #endif
91 
92 #ifndef av_ceil_log2
93 # define av_ceil_log2 av_ceil_log2_c
94 #endif
95 #ifndef av_clip
96 # define av_clip av_clip_c
97 #endif
98 #ifndef av_clip64
99 # define av_clip64 av_clip64_c
100 #endif
101 #ifndef av_clip_uint8
102 # define av_clip_uint8 av_clip_uint8_c
103 #endif
104 #ifndef av_clip_int8
105 # define av_clip_int8 av_clip_int8_c
106 #endif
107 #ifndef av_clip_uint16
108 # define av_clip_uint16 av_clip_uint16_c
109 #endif
110 #ifndef av_clip_int16
111 # define av_clip_int16 av_clip_int16_c
112 #endif
113 #ifndef av_clipl_int32
114 # define av_clipl_int32 av_clipl_int32_c
115 #endif
116 #ifndef av_clip_intp2
117 # define av_clip_intp2 av_clip_intp2_c
118 #endif
119 #ifndef av_clip_uintp2
120 # define av_clip_uintp2 av_clip_uintp2_c
121 #endif
122 #ifndef av_mod_uintp2
123 # define av_mod_uintp2 av_mod_uintp2_c
124 #endif
125 #ifndef av_sat_add32
126 # define av_sat_add32 av_sat_add32_c
127 #endif
128 #ifndef av_sat_dadd32
129 # define av_sat_dadd32 av_sat_dadd32_c
130 #endif
131 #ifndef av_sat_sub32
132 # define av_sat_sub32 av_sat_sub32_c
133 #endif
134 #ifndef av_sat_dsub32
135 # define av_sat_dsub32 av_sat_dsub32_c
136 #endif
137 #ifndef av_sat_add64
138 # define av_sat_add64 av_sat_add64_c
139 #endif
140 #ifndef av_sat_sub64
141 # define av_sat_sub64 av_sat_sub64_c
142 #endif
143 #ifndef av_clipf
144 # define av_clipf av_clipf_c
145 #endif
146 #ifndef av_clipd
147 # define av_clipd av_clipd_c
148 #endif
149 #ifndef av_popcount
150 # define av_popcount av_popcount_c
151 #endif
152 #ifndef av_popcount64
153 # define av_popcount64 av_popcount64_c
154 #endif
155 #ifndef av_parity
156 # define av_parity av_parity_c
157 #endif
158 
159 #ifndef av_log2
160 av_const int av_log2(unsigned v);
161 #endif
162 
163 #ifndef av_log2_16bit
164 av_const int av_log2_16bit(unsigned v);
165 #endif
166 
167 /**
168  * Clip a signed integer value into the amin-amax range.
169  * @param a value to clip
170  * @param amin minimum value of the clip range
171  * @param amax maximum value of the clip range
172  * @return clipped value
173  */
174 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
175 {
176 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
177  if (amin > amax) abort();
178 #endif
179  if (a < amin) return amin;
180  else if (a > amax) return amax;
181  else return a;
182 }
183 
184 /**
185  * Clip a signed 64bit integer value into the amin-amax range.
186  * @param a value to clip
187  * @param amin minimum value of the clip range
188  * @param amax maximum value of the clip range
189  * @return clipped value
190  */
191 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
192 {
193 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
194  if (amin > amax) abort();
195 #endif
196  if (a < amin) return amin;
197  else if (a > amax) return amax;
198  else return a;
199 }
200 
201 /**
202  * Clip a signed integer value into the 0-255 range.
203  * @param a value to clip
204  * @return clipped value
205  */
207 {
208  if (a&(~0xFF)) return (~a)>>31;
209  else return a;
210 }
211 
212 /**
213  * Clip a signed integer value into the -128,127 range.
214  * @param a value to clip
215  * @return clipped value
216  */
218 {
219  if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
220  else return a;
221 }
222 
223 /**
224  * Clip a signed integer value into the 0-65535 range.
225  * @param a value to clip
226  * @return clipped value
227  */
229 {
230  if (a&(~0xFFFF)) return (~a)>>31;
231  else return a;
232 }
233 
234 /**
235  * Clip a signed integer value into the -32768,32767 range.
236  * @param a value to clip
237  * @return clipped value
238  */
240 {
241  if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
242  else return a;
243 }
244 
245 /**
246  * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
247  * @param a value to clip
248  * @return clipped value
249  */
251 {
252  if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
253  else return (int32_t)a;
254 }
255 
256 /**
257  * Clip a signed integer into the -(2^p),(2^p-1) range.
258  * @param a value to clip
259  * @param p bit position to clip at
260  * @return clipped value
261  */
263 {
264  if (((unsigned)a + (1 << p)) & ~((2 << p) - 1))
265  return (a >> 31) ^ ((1 << p) - 1);
266  else
267  return a;
268 }
269 
270 /**
271  * Clip a signed integer to an unsigned power of two range.
272  * @param a value to clip
273  * @param p bit position to clip at
274  * @return clipped value
275  */
276 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
277 {
278  if (a & ~((1<<p) - 1)) return (~a) >> 31 & ((1<<p) - 1);
279  else return a;
280 }
281 
282 /**
283  * Clear high bits from an unsigned integer starting with specific bit position
284  * @param a value to clip
285  * @param p bit position to clip at
286  * @return clipped value
287  */
288 static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
289 {
290  return a & ((1U << p) - 1);
291 }
292 
293 /**
294  * Add two signed 32-bit values with saturation.
295  *
296  * @param a one value
297  * @param b another value
298  * @return sum with signed saturation
299  */
300 static av_always_inline int av_sat_add32_c(int a, int b)
301 {
302  return av_clipl_int32((int64_t)a + b);
303 }
304 
305 /**
306  * Add a doubled value to another value with saturation at both stages.
307  *
308  * @param a first value
309  * @param b value doubled and added to a
310  * @return sum sat(a + sat(2*b)) with signed saturation
311  */
312 static av_always_inline int av_sat_dadd32_c(int a, int b)
313 {
314  return av_sat_add32(a, av_sat_add32(b, b));
315 }
316 
317 /**
318  * Subtract two signed 32-bit values with saturation.
319  *
320  * @param a one value
321  * @param b another value
322  * @return difference with signed saturation
323  */
324 static av_always_inline int av_sat_sub32_c(int a, int b)
325 {
326  return av_clipl_int32((int64_t)a - b);
327 }
328 
329 /**
330  * Subtract a doubled value from another value with saturation at both stages.
331  *
332  * @param a first value
333  * @param b value doubled and subtracted from a
334  * @return difference sat(a - sat(2*b)) with signed saturation
335  */
336 static av_always_inline int av_sat_dsub32_c(int a, int b)
337 {
338  return av_sat_sub32(a, av_sat_add32(b, b));
339 }
340 
341 /**
342  * Add two signed 64-bit values with saturation.
343  *
344  * @param a one value
345  * @param b another value
346  * @return sum with signed saturation
347  */
348 static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) {
349 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
350  int64_t tmp;
351  return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
352 #else
353  int64_t s = a+(uint64_t)b;
354  if ((int64_t)(a^b | ~s^b) >= 0)
355  return INT64_MAX ^ (b >> 63);
356  return s;
357 #endif
358 }
359 
360 /**
361  * Subtract two signed 64-bit values with saturation.
362  *
363  * @param a one value
364  * @param b another value
365  * @return difference with signed saturation
366  */
367 static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) {
368 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
369  int64_t tmp;
370  return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
371 #else
372  if (b <= 0 && a >= INT64_MAX + b)
373  return INT64_MAX;
374  if (b >= 0 && a <= INT64_MIN + b)
375  return INT64_MIN;
376  return a - b;
377 #endif
378 }
379 
380 /**
381  * Clip a float value into the amin-amax range.
382  * @param a value to clip
383  * @param amin minimum value of the clip range
384  * @param amax maximum value of the clip range
385  * @return clipped value
386  */
387 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
388 {
389 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
390  if (amin > amax) abort();
391 #endif
392  if (a < amin) return amin;
393  else if (a > amax) return amax;
394  else return a;
395 }
396 
397 /**
398  * Clip a double value into the amin-amax range.
399  * @param a value to clip
400  * @param amin minimum value of the clip range
401  * @param amax maximum value of the clip range
402  * @return clipped value
403  */
404 static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
405 {
406 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
407  if (amin > amax) abort();
408 #endif
409  if (a < amin) return amin;
410  else if (a > amax) return amax;
411  else return a;
412 }
413 
414 /** Compute ceil(log2(x)).
415  * @param x value used to compute ceil(log2(x))
416  * @return computed ceiling of log2(x)
417  */
419 {
420  return av_log2((x - 1U) << 1);
421 }
422 
423 /**
424  * Count number of bits set to one in x
425  * @param x value to count bits of
426  * @return the number of bits set to one in x
427  */
429 {
430  x -= (x >> 1) & 0x55555555;
431  x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
432  x = (x + (x >> 4)) & 0x0F0F0F0F;
433  x += x >> 8;
434  return (x + (x >> 16)) & 0x3F;
435 }
436 
437 /**
438  * Count number of bits set to one in x
439  * @param x value to count bits of
440  * @return the number of bits set to one in x
441  */
443 {
444  return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
445 }
446 
447 static av_always_inline av_const int av_parity_c(uint32_t v)
448 {
449  return av_popcount(v) & 1;
450 }
451 
452 /**
453  * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
454  *
455  * @param val Output value, must be an lvalue of type uint32_t.
456  * @param GET_BYTE Expression reading one byte from the input.
457  * Evaluated up to 7 times (4 for the currently
458  * assigned Unicode range). With a memory buffer
459  * input, this could be *ptr++, or if you want to make sure
460  * that *ptr stops at the end of a NULL terminated string then
461  * *ptr ? *ptr++ : 0
462  * @param ERROR Expression to be evaluated on invalid input,
463  * typically a goto statement.
464  *
465  * @warning ERROR should not contain a loop control statement which
466  * could interact with the internal while loop, and should force an
467  * exit from the macro code (e.g. through a goto or a return) in order
468  * to prevent undefined results.
469  */
470 #define GET_UTF8(val, GET_BYTE, ERROR)\
471  val= (GET_BYTE);\
472  {\
473  uint32_t top = (val & 128) >> 1;\
474  if ((val & 0xc0) == 0x80 || val >= 0xFE)\
475  {ERROR}\
476  while (val & top) {\
477  unsigned int tmp = (GET_BYTE) - 128;\
478  if(tmp>>6)\
479  {ERROR}\
480  val= (val<<6) + tmp;\
481  top <<= 5;\
482  }\
483  val &= (top << 1) - 1;\
484  }
485 
486 /**
487  * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
488  *
489  * @param val Output value, must be an lvalue of type uint32_t.
490  * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
491  * to native byte order. Evaluated one or two times.
492  * @param ERROR Expression to be evaluated on invalid input,
493  * typically a goto statement.
494  */
495 #define GET_UTF16(val, GET_16BIT, ERROR)\
496  val = (GET_16BIT);\
497  {\
498  unsigned int hi = val - 0xD800;\
499  if (hi < 0x800) {\
500  val = (GET_16BIT) - 0xDC00;\
501  if (val > 0x3FFU || hi > 0x3FFU)\
502  {ERROR}\
503  val += (hi<<10) + 0x10000;\
504  }\
505  }\
506 
507 /**
508  * @def PUT_UTF8(val, tmp, PUT_BYTE)
509  * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
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-8. 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 uint8_t. It
514  * represents an intermediate value during conversion that is to be
515  * output by PUT_BYTE.
516  * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
517  * It could be a function or a statement, and uses tmp as the input byte.
518  * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
519  * executed up to 4 times for values in the valid UTF-8 range and up to
520  * 7 times in the general case, depending on the length of the converted
521  * Unicode character.
522  */
523 #define PUT_UTF8(val, tmp, PUT_BYTE)\
524  {\
525  int bytes, shift;\
526  uint32_t in = val;\
527  if (in < 0x80) {\
528  tmp = in;\
529  PUT_BYTE\
530  } else {\
531  bytes = (av_log2(in) + 4) / 5;\
532  shift = (bytes - 1) * 6;\
533  tmp = (256 - (256 >> bytes)) | (in >> shift);\
534  PUT_BYTE\
535  while (shift >= 6) {\
536  shift -= 6;\
537  tmp = 0x80 | ((in >> shift) & 0x3f);\
538  PUT_BYTE\
539  }\
540  }\
541  }
542 
543 /**
544  * @def PUT_UTF16(val, tmp, PUT_16BIT)
545  * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
546  * @param val is an input-only argument and should be of type uint32_t. It holds
547  * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
548  * val is given as a function it is executed only once.
549  * @param tmp is a temporary variable and should be of type uint16_t. It
550  * represents an intermediate value during conversion that is to be
551  * output by PUT_16BIT.
552  * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
553  * in desired endianness. It could be a function or a statement, and uses tmp
554  * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
555  * PUT_BYTE will be executed 1 or 2 times depending on input character.
556  */
557 #define PUT_UTF16(val, tmp, PUT_16BIT)\
558  {\
559  uint32_t in = val;\
560  if (in < 0x10000) {\
561  tmp = in;\
562  PUT_16BIT\
563  } else {\
564  tmp = 0xD800 | ((in - 0x10000) >> 10);\
565  PUT_16BIT\
566  tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
567  PUT_16BIT\
568  }\
569  }\
570 
571 
572 
573 #include "mem.h"
574 
575 #ifdef HAVE_AV_CONFIG_H
576 # include "internal.h"
577 #endif /* HAVE_AV_CONFIG_H */
578 
579 #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:288
av_log2_16bit
int av_log2_16bit(unsigned v)
Definition: intmath.c:31
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:26
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:276
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:324
av_const
#define av_const
Definition: attributes.h:84
b
#define b
Definition: input.c:40
av_popcount
#define av_popcount
Definition: common.h:150
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:228
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:206
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:312
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:191
U
#define U(x)
Definition: vp56_arith.h:37
macros.h
s
#define s(width, name)
Definition: cbs_vp9.c:257
limits.h
av_sat_sub32
#define av_sat_sub32
Definition: common.h:132
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:387
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:404
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:262
av_sat_add32
#define av_sat_add32
Definition: common.h:126
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:174
av_clipl_int32
#define av_clipl_int32
Definition: common.h:114
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:250
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:428
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:300
version.h
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:442
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:348
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:239
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:367
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:336
av_parity_c
static av_always_inline av_const int av_parity_c(uint32_t v)
Definition: common.h:447
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:418
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:217
intmath.h