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 45 #include "libavutil/avconfig.h" 48 # define AV_NE(be, le) (be) 50 # define AV_NE(be, le) (le) 54 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) 56 #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) 58 #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ 59 : ((a) + (1<<(b)) - 1) >> (b)) 61 #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT 63 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b)) 64 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b)) 72 #define FFABS(a) ((a) >= 0 ? (a) : (-(a))) 73 #define FFSIGN(a) ((a) > 0 ? 1 : -1) 81 #define FFNABS(a) ((a) <= 0 ? (a) : (-(a))) 92 #define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y))) 94 #define FFMAX(a,b) ((a) > (b) ? (a) : (b)) 95 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c) 96 #define FFMIN(a,b) ((a) > (b) ? (b) : (a)) 97 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c) 99 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) 100 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0])) 104 #ifdef HAVE_AV_CONFIG_H 116 #ifndef av_log2_16bit 129 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 130 if (amin > amax) abort();
132 if (a < amin)
return amin;
133 else if (a > amax)
return amax;
146 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 147 if (amin > amax) abort();
149 if (a < amin)
return amin;
150 else if (a > amax)
return amax;
161 if (a&(~0xFF))
return (~a)>>31;
172 if ((a+0x80U) & ~0xFF)
return (a>>31) ^ 0x7F;
183 if (a&(~0xFFFF))
return (~a)>>31;
194 if ((a+0x8000U) & ~0xFFFF)
return (a>>31) ^ 0x7FFF;
205 if ((a+0x80000000u) & ~UINT64_C(0xFFFFFFFF))
return (
int32_t)((a>>63) ^ 0x7FFFFFFF);
217 if (((
unsigned)a + (1 << p)) & ~((2 << p) - 1))
218 return (a >> 31) ^ ((1 << p) - 1);
231 if (a & ~((1<<p) - 1))
return (~a) >> 31 & ((1<<p) - 1);
243 return a & ((1
U << p) - 1);
255 return av_clipl_int32((int64_t)a + b);
267 return av_sat_add32(a, av_sat_add32(b, b));
279 return av_clipl_int32((int64_t)a - b);
291 return av_sat_sub32(a, av_sat_add32(b, b));
302 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow) 304 return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
306 int64_t
s = a+(uint64_t)b;
307 if ((int64_t)(a^b | ~s^
b) >= 0)
308 return INT64_MAX ^ (b >> 63);
321 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow) 323 return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN);
325 if (b <= 0 && a >= INT64_MAX + b)
327 if (b >= 0 && a <= INT64_MIN + b)
342 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 343 if (amin > amax) abort();
345 if (a < amin)
return amin;
346 else if (a > amax)
return amax;
359 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 360 if (amin > amax) abort();
362 if (a < amin)
return amin;
363 else if (a > amax)
return amax;
383 x -= (x >> 1) & 0x55555555;
384 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
385 x = (x + (x >> 4)) & 0x0F0F0F0F;
387 return (x + (x >> 16)) & 0x3F;
397 return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32));
402 return av_popcount(v) & 1;
405 #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24)) 406 #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24)) 426 #define GET_UTF8(val, GET_BYTE, ERROR)\ 429 uint32_t top = (val & 128) >> 1;\ 430 if ((val & 0xc0) == 0x80 || val >= 0xFE)\ 433 unsigned int tmp = (GET_BYTE) - 128;\ 436 val= (val<<6) + tmp;\ 439 val &= (top << 1) - 1;\ 451 #define GET_UTF16(val, GET_16BIT, ERROR)\ 454 unsigned int hi = val - 0xD800;\ 456 val = (GET_16BIT) - 0xDC00;\ 457 if (val > 0x3FFU || hi > 0x3FFU)\ 459 val += (hi<<10) + 0x10000;\ 479 #define PUT_UTF8(val, tmp, PUT_BYTE)\ 487 bytes = (av_log2(in) + 4) / 5;\ 488 shift = (bytes - 1) * 6;\ 489 tmp = (256 - (256 >> bytes)) | (in >> shift);\ 491 while (shift >= 6) {\ 493 tmp = 0x80 | ((in >> shift) & 0x3f);\ 513 #define PUT_UTF16(val, tmp, PUT_16BIT)\ 520 tmp = 0xD800 | ((in - 0x10000) >> 10);\ 522 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\ 531 #ifdef HAVE_AV_CONFIG_H 543 # define av_ceil_log2 av_ceil_log2_c 546 # define av_clip av_clip_c 549 # define av_clip64 av_clip64_c 551 #ifndef av_clip_uint8 552 # define av_clip_uint8 av_clip_uint8_c 555 # define av_clip_int8 av_clip_int8_c 557 #ifndef av_clip_uint16 558 # define av_clip_uint16 av_clip_uint16_c 560 #ifndef av_clip_int16 561 # define av_clip_int16 av_clip_int16_c 563 #ifndef av_clipl_int32 564 # define av_clipl_int32 av_clipl_int32_c 566 #ifndef av_clip_intp2 567 # define av_clip_intp2 av_clip_intp2_c 569 #ifndef av_clip_uintp2 570 # define av_clip_uintp2 av_clip_uintp2_c 572 #ifndef av_mod_uintp2 573 # define av_mod_uintp2 av_mod_uintp2_c 576 # define av_sat_add32 av_sat_add32_c 578 #ifndef av_sat_dadd32 579 # define av_sat_dadd32 av_sat_dadd32_c 582 # define av_sat_sub32 av_sat_sub32_c 584 #ifndef av_sat_dsub32 585 # define av_sat_dsub32 av_sat_dsub32_c 588 # define av_sat_add64 av_sat_add64_c 591 # define av_sat_sub64 av_sat_sub64_c 594 # define av_clipf av_clipf_c 597 # define av_clipd av_clipd_c 600 # define av_popcount av_popcount_c 602 #ifndef av_popcount64 603 # define av_popcount64 av_popcount64_c 606 # define av_parity av_parity_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.
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.
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.
Memory handling functions.
static av_always_inline int av_sat_sub32_c(int a, int b)
Subtract two signed 32-bit values with saturation.
static av_always_inline av_const int8_t av_clip_int8_c(int a)
Clip a signed integer value into the -128,127 range.
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
int av_log2_16bit(unsigned v)
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.
static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b)
Subtract two signed 64-bit values with saturation.
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.
Utility Preprocessor macros.
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.
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.
static av_always_inline av_const uint8_t av_clip_uint8_c(int a)
Clip a signed integer value into the 0-255 range.
common internal API header
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.
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.
static av_always_inline av_const int16_t av_clip_int16_c(int a)
Clip a signed integer value into the -32768,32767 range.
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.
static av_always_inline int av_sat_add32_c(int a, int b)
Add two signed 32-bit values with saturation.
static av_always_inline av_const int av_popcount64_c(uint64_t x)
Count number of bits set to one in x.
static av_always_inline av_const int av_parity_c(uint32_t v)
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.
static av_always_inline av_const int av_ceil_log2_c(int x)
Compute ceil(log2(x)).
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.
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.