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1 04d7f601 Diego Biurrun
/*
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 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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 *
4 b78e7197 Diego Biurrun
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
7 04d7f601 Diego Biurrun
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
9 b78e7197 Diego Biurrun
 * 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
17 b78e7197 Diego Biurrun
 * License along with FFmpeg; if not, write to the Free Software
18 04d7f601 Diego Biurrun
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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21 983e3246 Michael Niedermayer
/**
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 * @file common.h
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 * common internal and external API header
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 */
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26 5b21bdab Diego Biurrun
#ifndef FFMPEG_COMMON_H
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#define FFMPEG_COMMON_H
28 de6d9b64 Fabrice Bellard
29 1845bf1f Måns Rullgård
#include <inttypes.h>
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31 420b073b Fabrice Bellard
#ifdef HAVE_AV_CONFIG_H
32 1a565432 Fabrice Bellard
/* only include the following when compiling package */
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#    include "config.h"
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#    include <stdlib.h>
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#    include <stdio.h>
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#    include <string.h>
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#    include <ctype.h>
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#    include <limits.h>
40 8fa36ae0 François Revol
#    include <errno.h>
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#    include <math.h>
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#endif /* HAVE_AV_CONFIG_H */
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#ifndef av_always_inline
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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#    define av_always_inline __attribute__((always_inline)) inline
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#else
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#    define av_always_inline inline
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#endif
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#endif
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#ifndef av_noinline
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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#    define av_noinline __attribute__((noinline))
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#else
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#    define av_noinline
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#endif
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#endif
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#ifndef av_pure
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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#    define av_pure __attribute__((pure))
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#else
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#    define av_pure
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#endif
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#endif
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#ifndef av_const
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#if defined(__GNUC__) && (__GNUC__ > 2 || __GNUC__ == 2 && __GNUC_MINOR__ > 5)
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#    define av_const __attribute__((const))
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#else
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#    define av_const
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#endif
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#endif
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#ifndef av_cold
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#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__ > 2)
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#    define av_cold __attribute__((cold))
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#else
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#    define av_cold
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#endif
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#endif
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84 849f1035 Måns Rullgård
#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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#ifndef attribute_deprecated
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#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
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#    define attribute_deprecated __attribute__((deprecated))
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#else
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#    define attribute_deprecated
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#endif
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#endif
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#ifndef av_unused
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#if defined(__GNUC__)
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#    define av_unused __attribute__((unused))
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#else
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#    define av_unused
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#endif
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#endif
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#include "mem.h"
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//rounded divison & 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))
116 b842ecbe Baptiste Coudurier
#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)
119 67eca72d Michael Niedermayer
120 de6d9b64 Fabrice Bellard
/* misc math functions */
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extern const uint8_t ff_log2_tab[256];
122 de6d9b64 Fabrice Bellard
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static inline av_const int av_log2(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(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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/* median of 3 */
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static inline av_const int mid_pred(int a, int b, int c)
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{
154 d0b456ba Christophe Mutricy
#ifdef HAVE_CMOV
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    int i=b;
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    asm volatile(
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        "cmp    %2, %1 \n\t"
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        "cmovg  %1, %0 \n\t"
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        "cmovg  %2, %1 \n\t"
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        "cmp    %3, %1 \n\t"
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        "cmovl  %3, %1 \n\t"
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        "cmp    %1, %0 \n\t"
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        "cmovg  %1, %0 \n\t"
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        :"+&r"(i), "+&r"(a)
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        :"r"(b), "r"(c)
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    );
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    return i;
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#elif 0
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    int t= (a-b)&((a-b)>>31);
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    a-=t;
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    b+=t;
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    b-= (b-c)&((b-c)>>31);
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    b+= (a-b)&((a-b)>>31);
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    return b;
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#else
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    if(a>b){
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        if(c>b){
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            if(c>a) b=a;
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            else    b=c;
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        }
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    }else{
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        if(b>c){
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            if(c>a) b=c;
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            else    b=a;
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        }
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    }
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    return b;
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#endif
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}
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/**
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 * clip 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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206 77177335 Aurelien Jacobs
/**
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 * clip 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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217 ddb8ebe7 Aurelien Jacobs
/**
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 * clip 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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{
224
    if ((a+32768) & ~65535) return (a>>31) ^ 32767;
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    else                    return a;
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}
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228 9dbcbd92 Michael Niedermayer
/* math */
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int64_t av_const ff_gcd(int64_t a, int64_t b);
230 9dbcbd92 Michael Niedermayer
231 202ef8b8 Michael Niedermayer
/**
232
 * converts fourcc string to int
233
 */
234 85074d3c Zuxy Meng
static inline av_pure int ff_get_fourcc(const char *s){
235 05020c89 Reimar Döffinger
#ifdef HAVE_AV_CONFIG_H
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    assert( strlen(s)==4 );
237 05020c89 Reimar Döffinger
#endif
238 966df5b6 Mike Melanson
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    return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
240
}
241
242 e8750b00 Fred Rothganger
#define MKTAG(a,b,c,d) (a | (b << 8) | (c << 16) | (d << 24))
243
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
244
245 d73427e3 Guillaume Poirier
/*!
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 * \def GET_UTF8(val, GET_BYTE, ERROR)
247 90b5b51e Diego Biurrun
 * converts a UTF-8 character (up to 4 bytes long) to its 32-bit UCS-4 encoded form
248 d73427e3 Guillaume Poirier
 * \param val is the output and should be of type uint32_t. It holds the converted
249 90b5b51e Diego Biurrun
 * 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
251 d73427e3 Guillaume Poirier
 * a function or a statement whose return value or evaluated value is of type
252 90b5b51e Diego Biurrun
 * 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,
256
 * like exit(), goto, return, break, or continue.
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 */
258 9d82b0dd Michael Niedermayer
#define GET_UTF8(val, GET_BYTE, ERROR)\
259
    val= GET_BYTE;\
260
    {\
261
        int ones= 7 - av_log2(val ^ 255);\
262
        if(ones==1)\
263
            ERROR\
264
        val&= 127>>ones;\
265
        while(--ones > 0){\
266
            int tmp= GET_BYTE - 128;\
267
            if(tmp>>6)\
268
                ERROR\
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            val= (val<<6) + tmp;\
270
        }\
271
    }
272 2ad1516a Michael Niedermayer
273 0e8c148b Guillaume Poirier
/*!
274 34d33769 Guillaume Poirier
 * \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).
276 0e8c148b Guillaume Poirier
 * \param val is an input only argument and should be of type uint32_t. It holds
277 90b5b51e Diego Biurrun
 * a ucs4 encoded unicode character that is to be converted to UTF-8. If
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 * val is given as a function it's executed only once.
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 * \param tmp is a temporary variable and should be of type uint8_t. It
280
 * represents an intermediate value during conversion that is to be
281
 * outputted by PUT_BYTE.
282 90b5b51e Diego Biurrun
 * \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
285 90b5b51e Diego Biurrun
 * executed up to 4 times for values in the valid UTF-8 range and up to
286 40a08c7e Reimar Döffinger
 * 7 times in the general case, depending on the length of the converted
287 0e8c148b Guillaume Poirier
 * unicode character.
288
 */
289 360932f7 Zuxy Meng
#define PUT_UTF8(val, tmp, PUT_BYTE)\
290
    {\
291
        int bytes, shift;\
292
        uint32_t in = val;\
293
        if (in < 0x80) {\
294
            tmp = in;\
295
            PUT_BYTE\
296
        } else {\
297
            bytes = (av_log2(in) + 4) / 5;\
298
            shift = (bytes - 1) * 6;\
299
            tmp = (256 - (256 >> bytes)) | (in >> shift);\
300
            PUT_BYTE\
301
            while (shift >= 6) {\
302
                shift -= 6;\
303
                tmp = 0x80 | ((in >> shift) & 0x3f);\
304
                PUT_BYTE\
305
            }\
306
        }\
307
    }
308
309 f70c2739 Marc Hoffman
#if defined(ARCH_X86) || defined(ARCH_POWERPC) || defined(ARCH_BFIN)
310 b6c748ed Roman Shaposhnik
#define AV_READ_TIME read_time
311 8230cf02 Aurelien Jacobs
#if defined(ARCH_X86_64)
312 0775c88f Michael Niedermayer
static inline uint64_t read_time(void)
313 8230cf02 Aurelien Jacobs
{
314 27af15dc Diego Biurrun
    uint64_t a, d;
315
    asm volatile("rdtsc\n\t"
316
                 : "=a" (a), "=d" (d));
317
    return (d << 32) | (a & 0xffffffff);
318 8230cf02 Aurelien Jacobs
}
319 419b8784 Diego Biurrun
#elif defined(ARCH_X86_32)
320 0775c88f Michael Niedermayer
static inline long long read_time(void)
321 b534c7f9 Michael Niedermayer
{
322 27af15dc Diego Biurrun
    long long l;
323
    asm volatile("rdtsc\n\t"
324
                 : "=A" (l));
325
    return l;
326 b534c7f9 Michael Niedermayer
}
327 f70c2739 Marc Hoffman
#elif ARCH_BFIN
328
static inline uint64_t read_time(void)
329
{
330
    union {
331
        struct {
332
            unsigned lo;
333
            unsigned hi;
334
        } p;
335
        unsigned long long c;
336
    } t;
337
    asm volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
338
    return t.c;
339
}
340 0775c88f Michael Niedermayer
#else //FIXME check ppc64
341
static inline uint64_t read_time(void)
342
{
343
    uint32_t tbu, tbl, temp;
344
345
     /* from section 2.2.1 of the 32-bit PowerPC PEM */
346 c88c253d Diego Biurrun
     asm volatile(
347 0775c88f Michael Niedermayer
         "1:\n"
348
         "mftbu  %2\n"
349
         "mftb   %0\n"
350
         "mftbu  %1\n"
351
         "cmpw   %2,%1\n"
352
         "bne    1b\n"
353
     : "=r"(tbl), "=r"(tbu), "=r"(temp)
354
     :
355
     : "cc");
356
357
     return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
358
}
359 8230cf02 Aurelien Jacobs
#endif
360 b6c748ed Roman Shaposhnik
#elif defined(HAVE_GETHRTIME)
361
#define AV_READ_TIME gethrtime
362
#endif
363 b534c7f9 Michael Niedermayer
364 b6c748ed Roman Shaposhnik
#ifdef AV_READ_TIME
365 b534c7f9 Michael Niedermayer
#define START_TIMER \
366
uint64_t tend;\
367 b6c748ed Roman Shaposhnik
uint64_t tstart= AV_READ_TIME();\
368 b534c7f9 Michael Niedermayer
369
#define STOP_TIMER(id) \
370 b6c748ed Roman Shaposhnik
tend= AV_READ_TIME();\
371 d705e4a6 Michael Niedermayer
{\
372 27af15dc Diego Biurrun
    static uint64_t tsum=0;\
373
    static int tcount=0;\
374
    static int tskip_count=0;\
375
    if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\
376
        tsum+= tend - tstart;\
377
        tcount++;\
378
    }else\
379
        tskip_count++;\
380
    if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
381
        av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n",\
382
               tsum*10/tcount, id, tcount, tskip_count);\
383
    }\
384 b534c7f9 Michael Niedermayer
}
385 0187e903 Michael Niedermayer
#else
386 115329f1 Diego Biurrun
#define START_TIMER
387 0187e903 Michael Niedermayer
#define STOP_TIMER(id) {}
388 b534c7f9 Michael Niedermayer
#endif
389
390 5b21bdab Diego Biurrun
#endif /* FFMPEG_COMMON_H */