2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
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.
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.
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
23 * common internal and external API header
26 #ifndef AVUTIL_COMMON_H
27 #define AVUTIL_COMMON_H
29 #if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C)
30 #error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS
42 #include "attributes.h"
44 #include "libavutil/avconfig.h"
47 # define AV_NE(be, le) (be)
49 # define AV_NE(be, le) (le)
52 //rounded division & shift
53 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
55 #define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
56 /* assume a>0 and b>0 */
57 #define FF_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
58 : ((a) + (1<<(b)) - 1) >> (b))
59 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
60 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
61 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
62 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
64 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
65 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
66 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
67 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
69 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
70 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
71 #define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
73 /* misc math functions */
76 * Reverse the order of the bits of an 8-bits unsigned integer.
79 extern attribute_deprecated const uint8_t av_reverse[256];
82 #ifdef HAVE_AV_CONFIG_H
87 /* Pull in unguarded fallback defines at the end of this file. */
91 av_const int av_log2(unsigned v);
95 av_const int av_log2_16bit(unsigned v);
99 * Clip a signed integer value into the amin-amax range.
100 * @param a value to clip
101 * @param amin minimum value of the clip range
102 * @param amax maximum value of the clip range
103 * @return clipped value
105 static av_always_inline av_const int av_clip_c(int a, int amin, int amax)
107 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
108 if (amin > amax) abort();
110 if (a < amin) return amin;
111 else if (a > amax) return amax;
116 * Clip a signed 64bit integer value into the amin-amax range.
117 * @param a value to clip
118 * @param amin minimum value of the clip range
119 * @param amax maximum value of the clip range
120 * @return clipped value
122 static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax)
124 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
125 if (amin > amax) abort();
127 if (a < amin) return amin;
128 else if (a > amax) return amax;
133 * Clip a signed integer value into the 0-255 range.
134 * @param a value to clip
135 * @return clipped value
137 static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
139 if (a&(~0xFF)) return (-a)>>31;
144 * Clip a signed integer value into the -128,127 range.
145 * @param a value to clip
146 * @return clipped value
148 static av_always_inline av_const int8_t av_clip_int8_c(int a)
150 if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F;
155 * Clip a signed integer value into the 0-65535 range.
156 * @param a value to clip
157 * @return clipped value
159 static av_always_inline av_const uint16_t av_clip_uint16_c(int a)
161 if (a&(~0xFFFF)) return (-a)>>31;
166 * Clip a signed integer value into the -32768,32767 range.
167 * @param a value to clip
168 * @return clipped value
170 static av_always_inline av_const int16_t av_clip_int16_c(int a)
172 if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF;
177 * Clip a signed 64-bit integer value into the -2147483648,2147483647 range.
178 * @param a value to clip
179 * @return clipped value
181 static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a)
183 if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF);
184 else return (int32_t)a;
188 * Clip a signed integer into the -(2^p),(2^p-1) range.
189 * @param a value to clip
190 * @param p bit position to clip at
191 * @return clipped value
193 static av_always_inline av_const int av_clip_intp2_c(int a, int p)
195 if ((a + (1 << p)) & ~((2 << p) - 1))
196 return (a >> 31) ^ ((1 << p) - 1);
202 * Clip a signed integer to an unsigned power of two range.
203 * @param a value to clip
204 * @param p bit position to clip at
205 * @return clipped value
207 static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p)
209 if (a & ~((1<<p) - 1)) return -a >> 31 & ((1<<p) - 1);
214 * Clear high bits from an unsigned integer starting with specific bit position
215 * @param a value to clip
216 * @param p bit position to clip at
217 * @return clipped value
219 static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p)
221 return a & ((1 << p) - 1);
225 * Add two signed 32-bit values with saturation.
228 * @param b another value
229 * @return sum with signed saturation
231 static av_always_inline int av_sat_add32_c(int a, int b)
233 return av_clipl_int32((int64_t)a + b);
237 * Add a doubled value to another value with saturation at both stages.
239 * @param a first value
240 * @param b value doubled and added to a
241 * @return sum with signed saturation
243 static av_always_inline int av_sat_dadd32_c(int a, int b)
245 return av_sat_add32(a, av_sat_add32(b, b));
249 * Clip a float value into the amin-amax range.
250 * @param a value to clip
251 * @param amin minimum value of the clip range
252 * @param amax maximum value of the clip range
253 * @return clipped value
255 static av_always_inline av_const float av_clipf_c(float a, float amin, float amax)
257 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
258 if (amin > amax) abort();
260 if (a < amin) return amin;
261 else if (a > amax) return amax;
266 * Clip a double value into the amin-amax range.
267 * @param a value to clip
268 * @param amin minimum value of the clip range
269 * @param amax maximum value of the clip range
270 * @return clipped value
272 static av_always_inline av_const double av_clipd_c(double a, double amin, double amax)
274 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
275 if (amin > amax) abort();
277 if (a < amin) return amin;
278 else if (a > amax) return amax;
282 /** Compute ceil(log2(x)).
283 * @param x value used to compute ceil(log2(x))
284 * @return computed ceiling of log2(x)
286 static av_always_inline av_const int av_ceil_log2_c(int x)
288 return av_log2((x - 1) << 1);
292 * Count number of bits set to one in x
293 * @param x value to count bits of
294 * @return the number of bits set to one in x
296 static av_always_inline av_const int av_popcount_c(uint32_t x)
298 x -= (x >> 1) & 0x55555555;
299 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
300 x = (x + (x >> 4)) & 0x0F0F0F0F;
302 return (x + (x >> 16)) & 0x3F;
306 * Count number of bits set to one in x
307 * @param x value to count bits of
308 * @return the number of bits set to one in x
310 static av_always_inline av_const int av_popcount64_c(uint64_t x)
312 return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
315 #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
316 #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
319 * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
321 * @param val Output value, must be an lvalue of type uint32_t.
322 * @param GET_BYTE Expression reading one byte from the input.
323 * Evaluated up to 7 times (4 for the currently
324 * assigned Unicode range). With a memory buffer
325 * input, this could be *ptr++.
326 * @param ERROR Expression to be evaluated on invalid input,
327 * typically a goto statement.
329 * @warning ERROR should not contain a loop control statement which
330 * could interact with the internal while loop, and should force an
331 * exit from the macro code (e.g. through a goto or a return) in order
332 * to prevent undefined results.
334 #define GET_UTF8(val, GET_BYTE, ERROR)\
337 uint32_t top = (val & 128) >> 1;\
338 if ((val & 0xc0) == 0x80 || val >= 0xFE)\
341 int tmp= GET_BYTE - 128;\
344 val= (val<<6) + tmp;\
347 val &= (top << 1) - 1;\
351 * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
353 * @param val Output value, must be an lvalue of type uint32_t.
354 * @param GET_16BIT Expression returning two bytes of UTF-16 data converted
355 * to native byte order. Evaluated one or two times.
356 * @param ERROR Expression to be evaluated on invalid input,
357 * typically a goto statement.
359 #define GET_UTF16(val, GET_16BIT, ERROR)\
362 unsigned int hi = val - 0xD800;\
364 val = GET_16BIT - 0xDC00;\
365 if (val > 0x3FFU || hi > 0x3FFU)\
367 val += (hi<<10) + 0x10000;\
372 * @def PUT_UTF8(val, tmp, PUT_BYTE)
373 * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
374 * @param val is an input-only argument and should be of type uint32_t. It holds
375 * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
376 * val is given as a function it is executed only once.
377 * @param tmp is a temporary variable and should be of type uint8_t. It
378 * represents an intermediate value during conversion that is to be
379 * output by PUT_BYTE.
380 * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
381 * It could be a function or a statement, and uses tmp as the input byte.
382 * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
383 * executed up to 4 times for values in the valid UTF-8 range and up to
384 * 7 times in the general case, depending on the length of the converted
387 #define PUT_UTF8(val, tmp, PUT_BYTE)\
395 bytes = (av_log2(in) + 4) / 5;\
396 shift = (bytes - 1) * 6;\
397 tmp = (256 - (256 >> bytes)) | (in >> shift);\
399 while (shift >= 6) {\
401 tmp = 0x80 | ((in >> shift) & 0x3f);\
408 * @def PUT_UTF16(val, tmp, PUT_16BIT)
409 * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
410 * @param val is an input-only argument and should be of type uint32_t. It holds
411 * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
412 * val is given as a function it is executed only once.
413 * @param tmp is a temporary variable and should be of type uint16_t. It
414 * represents an intermediate value during conversion that is to be
415 * output by PUT_16BIT.
416 * @param PUT_16BIT writes the converted UTF-16 data to any proper destination
417 * in desired endianness. It could be a function or a statement, and uses tmp
418 * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
419 * PUT_BYTE will be executed 1 or 2 times depending on input character.
421 #define PUT_UTF16(val, tmp, PUT_16BIT)\
428 tmp = 0xD800 | ((in - 0x10000) >> 10);\
430 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
439 #ifdef HAVE_AV_CONFIG_H
440 # include "internal.h"
441 #endif /* HAVE_AV_CONFIG_H */
443 #endif /* AVUTIL_COMMON_H */
446 * The following definitions are outside the multiple inclusion guard
447 * to ensure they are immediately available in intmath.h.
451 # define av_ceil_log2 av_ceil_log2_c
454 # define av_clip av_clip_c
457 # define av_clip64 av_clip64_c
459 #ifndef av_clip_uint8
460 # define av_clip_uint8 av_clip_uint8_c
463 # define av_clip_int8 av_clip_int8_c
465 #ifndef av_clip_uint16
466 # define av_clip_uint16 av_clip_uint16_c
468 #ifndef av_clip_int16
469 # define av_clip_int16 av_clip_int16_c
471 #ifndef av_clipl_int32
472 # define av_clipl_int32 av_clipl_int32_c
474 #ifndef av_clip_intp2
475 # define av_clip_intp2 av_clip_intp2_c
477 #ifndef av_clip_uintp2
478 # define av_clip_uintp2 av_clip_uintp2_c
480 #ifndef av_mod_uintp2
481 # define av_mod_uintp2 av_mod_uintp2_c
484 # define av_sat_add32 av_sat_add32_c
486 #ifndef av_sat_dadd32
487 # define av_sat_dadd32 av_sat_dadd32_c
490 # define av_clipf av_clipf_c
493 # define av_clipd av_clipd_c
496 # define av_popcount av_popcount_c
498 #ifndef av_popcount64
499 # define av_popcount64 av_popcount64_c