mirror of https://git.ffmpeg.org/ffmpeg.git
298 lines
8.9 KiB
C
298 lines
8.9 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file libavutil/common.h
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* common internal and external API header
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*/
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#ifndef AVUTIL_COMMON_H
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#define AVUTIL_COMMON_H
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "attributes.h"
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//rounded division & shift
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#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
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/* assume b>0 */
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#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
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#define FFABS(a) ((a) >= 0 ? (a) : (-(a)))
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#define FFSIGN(a) ((a) > 0 ? 1 : -1)
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#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
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#define FFMAX3(a,b,c) FFMAX(FFMAX(a,b),c)
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#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
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#define FFMIN3(a,b,c) FFMIN(FFMIN(a,b),c)
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#define FFSWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
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#define FF_ARRAY_ELEMS(a) (sizeof(a) / sizeof((a)[0]))
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#define FFALIGN(x, a) (((x)+(a)-1)&~((a)-1))
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/* misc math functions */
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extern const uint8_t ff_log2_tab[256];
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extern const uint8_t av_reverse[256];
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static inline av_const int av_log2_c(unsigned int v)
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{
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int n = 0;
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if (v & 0xffff0000) {
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v >>= 16;
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n += 16;
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}
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if (v & 0xff00) {
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v >>= 8;
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n += 8;
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}
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n += ff_log2_tab[v];
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return n;
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}
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static inline av_const int av_log2_16bit_c(unsigned int v)
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{
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int n = 0;
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if (v & 0xff00) {
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v >>= 8;
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n += 8;
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}
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n += ff_log2_tab[v];
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return n;
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}
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#ifdef HAVE_AV_CONFIG_H
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# include "config.h"
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# include "intmath.h"
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#endif
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#ifndef av_log2
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# define av_log2 av_log2_c
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#endif
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#ifndef av_log2_16bit
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# define av_log2_16bit av_log2_16bit_c
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#endif
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/**
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* Clips a signed integer value into the amin-amax range.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static inline av_const int av_clip(int a, int amin, int amax)
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{
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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/**
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* Clips a signed integer value into the 0-255 range.
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* @param a value to clip
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* @return clipped value
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*/
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static inline av_const uint8_t av_clip_uint8(int a)
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{
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if (a&(~255)) return (-a)>>31;
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else return a;
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}
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/**
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* Clips a signed integer value into the 0-65535 range.
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* @param a value to clip
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* @return clipped value
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*/
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static inline av_const uint16_t av_clip_uint16(int a)
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{
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if (a&(~65535)) return (-a)>>31;
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else return a;
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}
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/**
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* Clips a signed integer value into the -32768,32767 range.
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* @param a value to clip
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* @return clipped value
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*/
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static inline av_const int16_t av_clip_int16(int a)
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{
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if ((a+32768) & ~65535) return (a>>31) ^ 32767;
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else return a;
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}
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/**
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* Clips a float value into the amin-amax range.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static inline av_const float av_clipf(float a, float amin, float amax)
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{
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if (a < amin) return amin;
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else if (a > amax) return amax;
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else return a;
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}
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/** Computes ceil(log2(x)).
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* @param x value used to compute ceil(log2(x))
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* @return computed ceiling of log2(x)
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*/
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static inline av_const int av_ceil_log2(int x)
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{
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return av_log2((x - 1) << 1);
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}
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#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
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#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
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/*!
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* \def GET_UTF8(val, GET_BYTE, ERROR)
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* Converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form
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* \param val is the output and should be of type uint32_t. It holds the converted
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* UCS-4 character and should be a left value.
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* \param GET_BYTE gets UTF-8 encoded bytes from any proper source. It can be
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* a function or a statement whose return value or evaluated value is of type
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* uint8_t. It will be executed up to 4 times for values in the valid UTF-8 range,
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* and up to 7 times in the general case.
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* \param ERROR action that should be taken when an invalid UTF-8 byte is returned
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* from GET_BYTE. It should be a statement that jumps out of the macro,
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* like exit(), goto, return, break, or continue.
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*/
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#define GET_UTF8(val, GET_BYTE, ERROR)\
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val= GET_BYTE;\
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{\
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int ones= 7 - av_log2(val ^ 255);\
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if(ones==1)\
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ERROR\
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val&= 127>>ones;\
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while(--ones > 0){\
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int tmp= GET_BYTE - 128;\
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if(tmp>>6)\
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ERROR\
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val= (val<<6) + tmp;\
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}\
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}
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/*!
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* \def GET_UTF16(val, GET_16BIT, ERROR)
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* Converts a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form
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* \param val is the output and should be of type uint32_t. It holds the converted
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* UCS-4 character and should be a left value.
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* \param GET_16BIT gets two bytes of UTF-16 encoded data converted to native endianness.
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* It can be a function or a statement whose return value or evaluated value is of type
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* uint16_t. It will be executed up to 2 times.
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* \param ERROR action that should be taken when an invalid UTF-16 surrogate is
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* returned from GET_BYTE. It should be a statement that jumps out of the macro,
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* like exit(), goto, return, break, or continue.
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*/
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#define GET_UTF16(val, GET_16BIT, ERROR)\
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val = GET_16BIT;\
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{\
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unsigned int hi = val - 0xD800;\
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if (hi < 0x800) {\
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val = GET_16BIT - 0xDC00;\
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if (val > 0x3FFU || hi > 0x3FFU)\
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ERROR\
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val += (hi<<10) + 0x10000;\
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}\
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}\
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/*!
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* \def PUT_UTF8(val, tmp, PUT_BYTE)
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* Converts a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long).
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* \param val is an input-only argument and should be of type uint32_t. It holds
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* a UCS-4 encoded Unicode character that is to be converted to UTF-8. If
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* val is given as a function it is executed only once.
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* \param tmp is a temporary variable and should be of type uint8_t. It
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* represents an intermediate value during conversion that is to be
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* output by PUT_BYTE.
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* \param PUT_BYTE writes the converted UTF-8 bytes to any proper destination.
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* It could be a function or a statement, and uses tmp as the input byte.
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* For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be
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* executed up to 4 times for values in the valid UTF-8 range and up to
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* 7 times in the general case, depending on the length of the converted
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* Unicode character.
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*/
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#define PUT_UTF8(val, tmp, PUT_BYTE)\
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{\
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int bytes, shift;\
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uint32_t in = val;\
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if (in < 0x80) {\
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tmp = in;\
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PUT_BYTE\
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} else {\
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bytes = (av_log2(in) + 4) / 5;\
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shift = (bytes - 1) * 6;\
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tmp = (256 - (256 >> bytes)) | (in >> shift);\
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PUT_BYTE\
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while (shift >= 6) {\
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shift -= 6;\
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tmp = 0x80 | ((in >> shift) & 0x3f);\
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PUT_BYTE\
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}\
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}\
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}
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/*!
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* \def PUT_UTF16(val, tmp, PUT_16BIT)
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* Converts a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes).
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* \param val is an input-only argument and should be of type uint32_t. It holds
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* a UCS-4 encoded Unicode character that is to be converted to UTF-16. If
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* val is given as a function it is executed only once.
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* \param tmp is a temporary variable and should be of type uint16_t. It
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* represents an intermediate value during conversion that is to be
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* output by PUT_16BIT.
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* \param PUT_16BIT writes the converted UTF-16 data to any proper destination
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* in desired endianness. It could be a function or a statement, and uses tmp
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* as the input byte. For example, PUT_BYTE could be "*output++ = tmp;"
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* PUT_BYTE will be executed 1 or 2 times depending on input character.
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*/
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#define PUT_UTF16(val, tmp, PUT_16BIT)\
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{\
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uint32_t in = val;\
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if (in < 0x10000) {\
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tmp = in;\
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PUT_16BIT\
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} else {\
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tmp = 0xD800 | ((in - 0x10000) >> 10);\
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PUT_16BIT\
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tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\
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PUT_16BIT\
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}\
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}\
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#include "mem.h"
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#ifdef HAVE_AV_CONFIG_H
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# include "internal.h"
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#endif /* HAVE_AV_CONFIG_H */
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#endif /* AVUTIL_COMMON_H */
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