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1 04d7f601 Diego Biurrun
/*
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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
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
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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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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 de6d9b64 Fabrice Bellard
#ifndef COMMON_H
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#define COMMON_H
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29 1845bf1f Måns Rullgård
#include <inttypes.h>
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31 420b073b Fabrice Bellard
#ifdef HAVE_AV_CONFIG_H
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/* 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>
38 56c4a184 Fabrice Bellard
#    include <ctype.h>
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#    include <limits.h>
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#    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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#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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72 154e30f6 Carl Eugen Hoyos
#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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80 792098c2 Panagiotis Issaris
#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 FFMIN(a,b) ((a) > (b) ? (b) : (a))
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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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94 de6d9b64 Fabrice Bellard
/* misc math functions */
95 a77caa4d Måns Rullgård
extern const uint8_t ff_log2_tab[256];
96 de6d9b64 Fabrice Bellard
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static inline int av_log2(unsigned int v)
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{
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    int n;
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    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 int av_log2_16bit(unsigned int v)
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{
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    int n;
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    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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129 45870f57 Michael Niedermayer
/* median of 3 */
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static inline int mid_pred(int a, int b, int c)
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{
132 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 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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 * 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 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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195 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 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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/* math */
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int64_t ff_gcd(int64_t a, int64_t b);
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209 202ef8b8 Michael Niedermayer
/**
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 * converts fourcc string to int
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 */
212 6a85ec8d Zdenek Kabelac
static inline int ff_get_fourcc(const char *s){
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#ifdef HAVE_AV_CONFIG_H
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    assert( strlen(s)==4 );
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#endif
216 966df5b6 Mike Melanson
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    return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
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}
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220 e8750b00 Fred Rothganger
#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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223 d73427e3 Guillaume Poirier
/*!
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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
226 d73427e3 Guillaume Poirier
 * \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
233 d73427e3 Guillaume Poirier
 * 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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 */
236 9d82b0dd Michael Niedermayer
#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)\
246
                ERROR\
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            val= (val<<6) + tmp;\
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        }\
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    }
250 2ad1516a Michael Niedermayer
251 0e8c148b Guillaume Poirier
/*!
252 34d33769 Guillaume Poirier
 * \def PUT_UTF8(val, tmp, PUT_BYTE)
253 90b5b51e Diego Biurrun
 * 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 ucs4 encoded unicode character that is to be converted to UTF-8. If
256 0e8c148b Guillaume Poirier
 * 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
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 * represents an intermediate value during conversion that is to be
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 * outputted 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
264 40a08c7e Reimar Döffinger
 * 7 times in the general case, depending on the length of the converted
265 0e8c148b Guillaume Poirier
 * unicode character.
266
 */
267 360932f7 Zuxy Meng
#define PUT_UTF8(val, tmp, PUT_BYTE)\
268
    {\
269
        int bytes, shift;\
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        uint32_t in = val;\
271
        if (in < 0x80) {\
272
            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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            }\
284
        }\
285
    }
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287 f70c2739 Marc Hoffman
#if defined(ARCH_X86) || defined(ARCH_POWERPC) || defined(ARCH_BFIN)
288 b6c748ed Roman Shaposhnik
#define AV_READ_TIME read_time
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#if defined(ARCH_X86_64)
290 0775c88f Michael Niedermayer
static inline uint64_t read_time(void)
291 8230cf02 Aurelien Jacobs
{
292 bb270c08 Diego Biurrun
        uint64_t a, d;
293
        asm volatile(   "rdtsc\n\t"
294
                : "=a" (a), "=d" (d)
295
        );
296
        return (d << 32) | (a & 0xffffffff);
297 8230cf02 Aurelien Jacobs
}
298 419b8784 Diego Biurrun
#elif defined(ARCH_X86_32)
299 0775c88f Michael Niedermayer
static inline long long read_time(void)
300 b534c7f9 Michael Niedermayer
{
301 bb270c08 Diego Biurrun
        long long l;
302
        asm volatile(   "rdtsc\n\t"
303
                : "=A" (l)
304
        );
305
        return l;
306 b534c7f9 Michael Niedermayer
}
307 f70c2739 Marc Hoffman
#elif ARCH_BFIN
308
static inline uint64_t read_time(void)
309
{
310
    union {
311
        struct {
312
            unsigned lo;
313
            unsigned hi;
314
        } p;
315
        unsigned long long c;
316
    } t;
317
    asm volatile ("%0=cycles; %1=cycles2;" : "=d" (t.p.lo), "=d" (t.p.hi));
318
    return t.c;
319
}
320 0775c88f Michael Niedermayer
#else //FIXME check ppc64
321
static inline uint64_t read_time(void)
322
{
323
    uint32_t tbu, tbl, temp;
324
325
     /* from section 2.2.1 of the 32-bit PowerPC PEM */
326
     __asm__ __volatile__(
327
         "1:\n"
328
         "mftbu  %2\n"
329
         "mftb   %0\n"
330
         "mftbu  %1\n"
331
         "cmpw   %2,%1\n"
332
         "bne    1b\n"
333
     : "=r"(tbl), "=r"(tbu), "=r"(temp)
334
     :
335
     : "cc");
336
337
     return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
338
}
339 8230cf02 Aurelien Jacobs
#endif
340 b6c748ed Roman Shaposhnik
#elif defined(HAVE_GETHRTIME)
341
#define AV_READ_TIME gethrtime
342
#endif
343 b534c7f9 Michael Niedermayer
344 b6c748ed Roman Shaposhnik
#ifdef AV_READ_TIME
345 b534c7f9 Michael Niedermayer
#define START_TIMER \
346
uint64_t tend;\
347 b6c748ed Roman Shaposhnik
uint64_t tstart= AV_READ_TIME();\
348 b534c7f9 Michael Niedermayer
349
#define STOP_TIMER(id) \
350 b6c748ed Roman Shaposhnik
tend= AV_READ_TIME();\
351 d705e4a6 Michael Niedermayer
{\
352
  static uint64_t tsum=0;\
353
  static int tcount=0;\
354
  static int tskip_count=0;\
355 9b0dfb27 Michael Niedermayer
  if(tcount<2 || tend - tstart < FFMAX(8*tsum/tcount, 2000)){\
356 d705e4a6 Michael Niedermayer
      tsum+= tend - tstart;\
357
      tcount++;\
358
  }else\
359
      tskip_count++;\
360 8e06f20a Loren Merritt
  if(((tcount+tskip_count)&(tcount+tskip_count-1))==0){\
361 e852beee Alexander Strasser
      av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
362 d705e4a6 Michael Niedermayer
  }\
363 b534c7f9 Michael Niedermayer
}
364 0187e903 Michael Niedermayer
#else
365 115329f1 Diego Biurrun
#define START_TIMER
366 0187e903 Michael Niedermayer
#define STOP_TIMER(id) {}
367 b534c7f9 Michael Niedermayer
#endif
368
369 96707bb7 Fabrice Bellard
#endif /* COMMON_H */