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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)))
89 #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))
90 #define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a))
101 #define FFDIFFSIGN(x,y) (((x)>(y)) - ((x)<(y)))
103 #define FFMAX(a,b) ((a) > (b) ? (a) : (b))
104 #define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
105 #define FFMIN(a,b) ((a) > (b) ? (b) : (a))
106 #define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
108 #define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
109 #define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
113 #ifdef HAVE_AV_CONFIG_H
119 # define av_ceil_log2 av_ceil_log2_c
122 # define av_clip av_clip_c
125 # define av_clip64 av_clip64_c
127 #ifndef av_clip_uint8
128 # define av_clip_uint8 av_clip_uint8_c
131 # define av_clip_int8 av_clip_int8_c
133 #ifndef av_clip_uint16
134 # define av_clip_uint16 av_clip_uint16_c
136 #ifndef av_clip_int16
137 # define av_clip_int16 av_clip_int16_c
139 #ifndef av_clipl_int32
140 # define av_clipl_int32 av_clipl_int32_c
142 #ifndef av_clip_intp2
143 # define av_clip_intp2 av_clip_intp2_c
145 #ifndef av_clip_uintp2
146 # define av_clip_uintp2 av_clip_uintp2_c
148 #ifndef av_mod_uintp2
149 # define av_mod_uintp2 av_mod_uintp2_c
152 # define av_sat_add32 av_sat_add32_c
154 #ifndef av_sat_dadd32
155 # define av_sat_dadd32 av_sat_dadd32_c
158 # define av_sat_sub32 av_sat_sub32_c
160 #ifndef av_sat_dsub32
161 # define av_sat_dsub32 av_sat_dsub32_c
164 # define av_sat_add64 av_sat_add64_c
167 # define av_sat_sub64 av_sat_sub64_c
170 # define av_clipf av_clipf_c
173 # define av_clipd av_clipd_c
176 # define av_popcount av_popcount_c
178 #ifndef av_popcount64
179 # define av_popcount64 av_popcount64_c
182 # define av_parity av_parity_c
189 #ifndef av_log2_16bit
202 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
203 if (amin > amax) abort();
205 if (
a < amin)
return amin;
206 else if (
a > amax)
return amax;
219 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
220 if (amin > amax) abort();
222 if (
a < amin)
return amin;
223 else if (
a > amax)
return amax;
234 if (
a&(~0xFF))
return (~
a)>>31;
245 if ((
a+0x80U) & ~0xFF)
return (
a>>31) ^ 0x7F;
256 if (
a&(~0xFFFF))
return (~
a)>>31;
267 if ((
a+0x8000U) & ~0xFFFF)
return (
a>>31) ^ 0x7FFF;
278 if ((
a+0x80000000u) & ~UINT64_C(0xFFFFFFFF))
return (
int32_t)((
a>>63) ^ 0x7FFFFFFF);
290 if (((
unsigned)
a + (1 << p)) & ~((2 << p) - 1))
291 return (
a >> 31) ^ ((1 << p) - 1);
304 if (
a & ~((1<<p) - 1))
return (~
a) >> 31 & ((1<<p) - 1);
316 return a & ((1
U << p) - 1);
375 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
377 return !__builtin_add_overflow(
a,
b, &
tmp) ?
tmp : (
tmp < 0 ? INT64_MAX : INT64_MIN);
379 int64_t
s =
a+(uint64_t)
b;
380 if ((int64_t)(
a^
b | ~
s^
b) >= 0)
381 return INT64_MAX ^ (
b >> 63);
394 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
396 return !__builtin_sub_overflow(
a,
b, &
tmp) ?
tmp : (
tmp < 0 ? INT64_MAX : INT64_MIN);
398 if (b <= 0 && a >= INT64_MAX +
b)
400 if (
b >= 0 &&
a <= INT64_MIN +
b)
415 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
416 if (amin > amax) abort();
418 if (
a < amin)
return amin;
419 else if (
a > amax)
return amax;
432 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
433 if (amin > amax) abort();
435 if (
a < amin)
return amin;
436 else if (
a > amax)
return amax;
456 x -= (x >> 1) & 0x55555555;
457 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
458 x = (x + (x >> 4)) & 0x0F0F0F0F;
460 return (x + (x >> 16)) & 0x3F;
478 #define MKTAG(a,b,c,d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24))
479 #define MKBETAG(a,b,c,d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24))
499 #define GET_UTF8(val, GET_BYTE, ERROR)\
502 uint32_t top = (val & 128) >> 1;\
503 if ((val & 0xc0) == 0x80 || val >= 0xFE)\
506 unsigned int tmp = (GET_BYTE) - 128;\
509 val= (val<<6) + tmp;\
512 val &= (top << 1) - 1;\
524 #define GET_UTF16(val, GET_16BIT, ERROR)\
527 unsigned int hi = val - 0xD800;\
529 val = (GET_16BIT) - 0xDC00;\
530 if (val > 0x3FFU || hi > 0x3FFU)\
532 val += (hi<<10) + 0x10000;\
552 #define PUT_UTF8(val, tmp, PUT_BYTE)\
560 bytes = (av_log2(in) + 4) / 5;\
561 shift = (bytes - 1) * 6;\
562 tmp = (256 - (256 >> bytes)) | (in >> shift);\
564 while (shift >= 6) {\
566 tmp = 0x80 | ((in >> shift) & 0x3f);\
586 #define PUT_UTF16(val, tmp, PUT_16BIT)\
593 tmp = 0xD800 | ((in - 0x10000) >> 10);\
595 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
604 #ifdef HAVE_AV_CONFIG_H
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.
int av_log2_16bit(unsigned v)
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.
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 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.
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 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 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 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 int av_clip_c(int a, int amin, int amax)
Clip a signed integer value into the amin-amax 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
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 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 int64_t av_sat_add64_c(int64_t a, int64_t b)
Add two signed 64-bit values with saturation.
static av_always_inline av_const int16_t av_clip_int16_c(int a)
Clip a signed integer value into the -32768,32767 range.
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.
static av_always_inline av_const int av_parity_c(uint32_t v)
static av_always_inline av_const int av_ceil_log2_c(int x)
Compute ceil(log2(x)).
static av_always_inline av_const int8_t av_clip_int8_c(int a)
Clip a signed integer value into the -128,127 range.