common internal and external API header More...
#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "attributes.h"
#include "libavutil/avconfig.h"
#include "config.h"
#include "intmath.h"
#include "common.h"
#include "mem.h"
#include "internal.h"
Go to the source code of this file.
Defines | |
#define | AV_NE(be, le) (le) |
#define | RSHIFT(a, b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) |
#define | ROUNDED_DIV(a, b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) |
#define | FFUDIV(a, b) (((a)>0 ?(a):(a)-(b)+1) / (b)) |
#define | FFUMOD(a, b) ((a)-(b)*FFUDIV(a,b)) |
#define | FFABS(a) ((a) >= 0 ? (a) : (-(a))) |
#define | FFSIGN(a) ((a) > 0 ? 1 : -1) |
#define | FFMAX(a, b) ((a) > (b) ? (a) : (b)) |
#define | FFMAX3(a, b, c) FFMAX(FFMAX(a,b),c) |
#define | FFMIN(a, b) ((a) > (b) ? (b) : (a)) |
#define | FFMIN3(a, b, c) FFMIN(FFMIN(a,b),c) |
#define | FFSWAP(type, a, b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) |
#define | FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0])) |
#define | FFALIGN(x, a) (((x)+(a)-1)&~((a)-1)) |
#define | MKTAG(a, b, c, d) ((a) | ((b) << 8) | ((c) << 16) | ((unsigned)(d) << 24)) |
#define | MKBETAG(a, b, c, d) ((d) | ((c) << 8) | ((b) << 16) | ((unsigned)(a) << 24)) |
#define | GET_UTF8(val, GET_BYTE, ERROR) |
Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form. | |
#define | GET_UTF16(val, GET_16BIT, ERROR) |
Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form. | |
#define | PUT_UTF8(val, tmp, PUT_BYTE) |
Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long). | |
#define | PUT_UTF16(val, tmp, PUT_16BIT) |
Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes). | |
Functions | |
static av_always_inline av_const int | av_log2_c (unsigned int v) |
static av_always_inline av_const int | av_log2_16bit_c (unsigned int v) |
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. | |
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 av_const int8_t | av_clip_int8_c (int a) |
Clip a signed integer value into the -128,127 range. | |
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 int16_t | av_clip_int16_c (int a) |
Clip a signed integer value into the -32768,32767 range. | |
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 unsigned | av_clip_uintp2_c (int a, int p) |
Clip a signed integer to an unsigned power of two 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 int | av_ceil_log2_c (int x) |
Compute ceil(log2(x)). | |
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 av_const int | av_popcount64_c (uint64_t x) |
Count number of bits set to one in x. | |
Variables | |
const uint8_t | ff_log2_tab [256] |
const uint8_t | av_reverse [256] |
common internal and external API header
Definition in file common.h.
#define FF_ARRAY_ELEMS | ( | a | ) | (sizeof(a) / sizeof((a)[0])) |
val = GET_16BIT;\
{\
unsigned int hi = val - 0xD800;\
if (hi < 0x800) {\
val = GET_16BIT - 0xDC00;\
if (val > 0x3FFU || hi > 0x3FFU)\
ERROR\
val += (hi<<10) + 0x10000;\
}\
}\
Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form.
val | Output value, must be an lvalue of type uint32_t. |
GET_16BIT | Expression returning two bytes of UTF-16 data converted to native byte order. Evaluated one or two times. |
ERROR | Expression to be evaluated on invalid input, typically a goto statement. |
val= GET_BYTE;\ {\ int ones= 7 - av_log2(val ^ 255);\ if(ones==1)\ ERROR\ val&= 127>>ones;\ while(--ones > 0){\ int tmp= GET_BYTE - 128;\ if(tmp>>6)\ ERROR\ val= (val<<6) + tmp;\ }\ }
Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form.
val | Output value, must be an lvalue of type uint32_t. |
GET_BYTE | Expression reading one byte from the input. Evaluated up to 7 times (4 for the currently assigned Unicode range). With a memory buffer input, this could be *ptr++. |
ERROR | Expression to be evaluated on invalid input, typically a goto statement. |
#define PUT_UTF16 | ( | val, | |
tmp, | |||
PUT_16BIT | |||
) |
{\
uint32_t in = val;\
if (in < 0x10000) {\
tmp = in;\
PUT_16BIT\
} else {\
tmp = 0xD800 | ((in - 0x10000) >> 10);\
PUT_16BIT\
tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
PUT_16BIT\
}\
}\
Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
val | is an input-only argument and should be of type uint32_t. It holds a UCS-4 encoded Unicode character that is to be converted to UTF-16. If val is given as a function it is executed only once. |
tmp | is a temporary variable and should be of type uint16_t. It represents an intermediate value during conversion that is to be output by PUT_16BIT. |
PUT_16BIT | writes the converted UTF-16 data to any proper destination in desired endianness. It could be a function or a statement, and uses tmp as the input byte. For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be executed 1 or 2 times depending on input character. |
#define PUT_UTF8 | ( | val, | |
tmp, | |||
PUT_BYTE | |||
) |
{\ int bytes, shift;\ uint32_t in = val;\ if (in < 0x80) {\ tmp = in;\ PUT_BYTE\ } else {\ bytes = (av_log2(in) + 4) / 5;\ shift = (bytes - 1) * 6;\ tmp = (256 - (256 >> bytes)) | (in >> shift);\ PUT_BYTE\ while (shift >= 6) {\ shift -= 6;\ tmp = 0x80 | ((in >> shift) & 0x3f);\ PUT_BYTE\ }\ }\ }
Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
val | is an input-only argument and should be of type uint32_t. It holds a UCS-4 encoded Unicode character that is to be converted to UTF-8. If val is given as a function it is executed only once. |
tmp | is a temporary variable and should be of type uint8_t. It represents an intermediate value during conversion that is to be output by PUT_BYTE. |
PUT_BYTE | writes the converted UTF-8 bytes to any proper destination. It could be a function or a statement, and uses tmp as the input byte. For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be executed up to 4 times for values in the valid UTF-8 range and up to 7 times in the general case, depending on the length of the converted Unicode character. |
#define ROUNDED_DIV | ( | a, | |
b | |||
) | (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) |
static av_always_inline av_const int av_ceil_log2_c | ( | int | x | ) | [static] |
static av_always_inline av_const int av_clip_c | ( | int | a, |
int | amin, | ||
int | amax | ||
) | [static] |
static av_always_inline av_const int16_t av_clip_int16_c | ( | int | a | ) | [static] |
static av_always_inline av_const int8_t av_clip_int8_c | ( | int | a | ) | [static] |
static av_always_inline av_const uint16_t av_clip_uint16_c | ( | int | a | ) | [static] |
static av_always_inline av_const uint8_t av_clip_uint8_c | ( | int | a | ) | [static] |
static av_always_inline av_const unsigned av_clip_uintp2_c | ( | int | a, |
int | p | ||
) | [static] |
static av_always_inline av_const float av_clipf_c | ( | float | a, |
float | amin, | ||
float | amax | ||
) | [static] |
static av_always_inline av_const int32_t av_clipl_int32_c | ( | int64_t | a | ) | [static] |
static av_always_inline av_const int av_log2_16bit_c | ( | unsigned int | v | ) | [static] |
static av_always_inline av_const int av_log2_c | ( | unsigned int | v | ) | [static] |
static av_always_inline av_const int av_popcount64_c | ( | uint64_t | x | ) | [static] |
static av_always_inline av_const int av_popcount_c | ( | uint32_t | x | ) | [static] |
const uint8_t av_reverse[256] |
Definition at line 54 of file mathematics.c.
const uint8_t ff_log2_tab[256] |
Definition at line 43 of file mathematics.c.