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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
46 #ifdef HAVE_AV_CONFIG_H
55 #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
57 #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
59 #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \
60 : ((a) + (1<<(b)) - 1) >> (b))
62 #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT
64 #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b))
65 #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b))
73 #define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
74 #define FFSIGN(a) ((a) > 0 ? 1 : -1)
82 #define FFNABS(a) ((a) <= 0 ? (a) : (-(a)))
90 #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a))
91 #define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a))
96 # define av_ceil_log2 av_ceil_log2_c
99 # define av_clip av_clip_c
102 # define av_clip64 av_clip64_c
104 #ifndef av_clip_uint8
105 # define av_clip_uint8 av_clip_uint8_c
108 # define av_clip_int8 av_clip_int8_c
110 #ifndef av_clip_uint16
111 # define av_clip_uint16 av_clip_uint16_c
113 #ifndef av_clip_int16
114 # define av_clip_int16 av_clip_int16_c
116 #ifndef av_clipl_int32
117 # define av_clipl_int32 av_clipl_int32_c
119 #ifndef av_clip_intp2
120 # define av_clip_intp2 av_clip_intp2_c
122 #ifndef av_clip_uintp2
123 # define av_clip_uintp2 av_clip_uintp2_c
125 #ifndef av_mod_uintp2
126 # define av_mod_uintp2 av_mod_uintp2_c
129 # define av_sat_add32 av_sat_add32_c
131 #ifndef av_sat_dadd32
132 # define av_sat_dadd32 av_sat_dadd32_c
135 # define av_sat_sub32 av_sat_sub32_c
137 #ifndef av_sat_dsub32
138 # define av_sat_dsub32 av_sat_dsub32_c
141 # define av_sat_add64 av_sat_add64_c
144 # define av_sat_sub64 av_sat_sub64_c
147 # define av_clipf av_clipf_c
150 # define av_clipd av_clipd_c
153 # define av_popcount av_popcount_c
155 #ifndef av_popcount64
156 # define av_popcount64 av_popcount64_c
159 # define av_parity av_parity_c
166 #ifndef av_log2_16bit
179 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
180 if (amin > amax) abort();
182 if (
a < amin)
return amin;
183 else if (
a > amax)
return amax;
196 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
197 if (amin > amax) abort();
199 if (
a < amin)
return amin;
200 else if (
a > amax)
return amax;
211 if (
a&(~0xFF))
return (~
a)>>31;
222 if ((
a+0x80U) & ~0xFF)
return (
a>>31) ^ 0x7F;
233 if (
a&(~0xFFFF))
return (~
a)>>31;
244 if ((
a+0x8000U) & ~0xFFFF)
return (
a>>31) ^ 0x7FFF;
255 if ((
a+0x80000000u) & ~UINT64_C(0xFFFFFFFF))
return (
int32_t)((
a>>63) ^ 0x7FFFFFFF);
267 if (((
unsigned)
a + (1 << p)) & ~((2 << p) - 1))
268 return (
a >> 31) ^ ((1 << p) - 1);
281 if (
a & ~((1<<p) - 1))
return (~
a) >> 31 & ((1<<p) - 1);
293 return a & ((1
U << p) - 1);
352 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow)
354 return !__builtin_add_overflow(
a,
b, &
tmp) ?
tmp : (
tmp < 0 ? INT64_MAX : INT64_MIN);
356 int64_t
s =
a+(uint64_t)
b;
357 if ((int64_t)(
a^
b | ~
s^
b) >= 0)
358 return INT64_MAX ^ (
b >> 63);
371 #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow)
373 return !__builtin_sub_overflow(
a,
b, &
tmp) ?
tmp : (
tmp < 0 ? INT64_MAX : INT64_MIN);
375 if (b <= 0 && a >= INT64_MAX +
b)
377 if (
b >= 0 &&
a <= INT64_MIN +
b)
394 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
395 if (amin > amax) abort();
411 #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
412 if (amin > amax) abort();
433 x -= (x >> 1) & 0x55555555;
434 x = (x & 0x33333333) + ((x >> 2) & 0x33333333);
435 x = (x + (x >> 4)) & 0x0F0F0F0F;
437 return (x + (x >> 16)) & 0x3F;
473 #define GET_UTF8(val, GET_BYTE, ERROR)\
476 uint32_t top = (val & 128) >> 1;\
477 if ((val & 0xc0) == 0x80 || val >= 0xFE)\
480 unsigned int tmp = (GET_BYTE) - 128;\
483 val= (val<<6) + tmp;\
486 val &= (top << 1) - 1;\
498 #define GET_UTF16(val, GET_16BIT, ERROR)\
501 unsigned int hi = val - 0xD800;\
503 val = (GET_16BIT) - 0xDC00;\
504 if (val > 0x3FFU || hi > 0x3FFU)\
506 val += (hi<<10) + 0x10000;\
526 #define PUT_UTF8(val, tmp, PUT_BYTE)\
534 bytes = (av_log2(in) + 4) / 5;\
535 shift = (bytes - 1) * 6;\
536 tmp = (256 - (256 >> bytes)) | (in >> shift);\
538 while (shift >= 6) {\
540 tmp = 0x80 | ((in >> shift) & 0x3f);\
560 #define PUT_UTF16(val, tmp, PUT_16BIT)\
567 tmp = 0xD800 | ((in - 0x10000) >> 10);\
569 tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
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.