#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 "config.h"
#include "intmath.h"
#include "mem.h"
#include "internal.h"
#include "intmath.h"
Go to the source code of this file.
Defines | |
#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 | 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) | (d << 24)) |
#define | MKBETAG(a, b, c, d) (d | (c << 8) | (b << 16) | (a << 24)) |
#define | GET_UTF8(val, GET_BYTE, ERROR) |
#define | GET_UTF16(val, GET_16BIT, ERROR) |
#define | PUT_UTF8(val, tmp, PUT_BYTE) |
#define | PUT_UTF16(val, tmp, PUT_16BIT) |
Functions | |
static av_const int | av_log2_c (unsigned int v) |
static av_const int | av_log2_16bit_c (unsigned int v) |
static av_const int | av_clip (int a, int amin, int amax) |
Clips a signed integer value into the amin-amax range. | |
static av_const uint8_t | av_clip_uint8 (int a) |
Clips a signed integer value into the 0-255 range. | |
static av_const uint16_t | av_clip_uint16 (int a) |
Clips a signed integer value into the 0-65535 range. | |
static av_const int16_t | av_clip_int16 (int a) |
Clips a signed integer value into the -32768,32767 range. | |
static av_const float | av_clipf (float a, float amin, float amax) |
Clips a float value into the amin-amax range. | |
static av_const int | av_ceil_log2 (int x) |
Computes ceil(log2(x)). | |
Variables | |
const uint8_t | ff_log2_tab [256] |
const uint8_t | av_reverse [256] |
#define FFSWAP | ( | type, | |||
a, | |||||
b | ) | do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0) |
#define GET_UTF16 | ( | val, | |||
GET_16BIT, | |||||
ERROR | ) |
Value:
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;\ }\ }\
val | is the output and should be of type uint32_t. It holds the converted UCS-4 character and should be a left value. | |
GET_16BIT | gets two bytes of UTF-16 encoded data converted to native endianness. It can be a function or a statement whose return value or evaluated value is of type uint16_t. It will be executed up to 2 times. | |
ERROR | action that should be taken when an invalid UTF-16 surrogate is returned from GET_BYTE. It should be a statement that jumps out of the macro, like exit(), goto, return, break, or continue. |
#define GET_UTF8 | ( | val, | |||
GET_BYTE, | |||||
ERROR | ) |
Value:
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;\ }\ }
val | is the output and should be of type uint32_t. It holds the converted UCS-4 character and should be a left value. | |
GET_BYTE | gets UTF-8 encoded bytes from any proper source. It can be a function or a statement whose return value or evaluated value is of type uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range, and up to 7 times in the general case. | |
ERROR | action that should be taken when an invalid UTF-8 byte is returned from GET_BYTE. It should be a statement that jumps out of the macro, like exit(), goto, return, break, or continue. |
#define MKBETAG | ( | a, | |||
b, | |||||
c, | |||||
d | ) | (d | (c << 8) | (b << 16) | (a << 24)) |
#define MKTAG | ( | a, | |||
b, | |||||
c, | |||||
d | ) | (a | (b << 8) | (c << 16) | (d << 24)) |
#define PUT_UTF16 | ( | val, | |||
tmp, | |||||
PUT_16BIT | ) |
Value:
{\ 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\ }\ }\
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 | ) |
Value:
{\ 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\ }\ }\ }
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)) |
#define RSHIFT | ( | a, | |||
b | ) | ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) |
static av_const int av_ceil_log2 | ( | int | x | ) | [inline, static] |
static av_const int av_clip | ( | int | a, | |
int | amin, | |||
int | amax | |||
) | [inline, static] |
static av_const int16_t av_clip_int16 | ( | int | a | ) | [inline, static] |
static av_const uint16_t av_clip_uint16 | ( | int | a | ) | [inline, static] |
static av_const uint8_t av_clip_uint8 | ( | int | a | ) | [inline, static] |
static av_const float av_clipf | ( | float | a, | |
float | amin, | |||
float | amax | |||
) | [inline, static] |
static av_const int av_log2_16bit_c | ( | unsigned int | v | ) | [inline, static] |
static av_const int av_log2_c | ( | unsigned int | v | ) | [inline, static] |
const uint8_t av_reverse[256] |
Definition at line 53 of file mathematics.c.
const uint8_t ff_log2_tab[256] |
Definition at line 42 of file mathematics.c.