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FFmpeg/libavutil/common.h

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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file common.h
* common internal and external api header.
*/
#ifndef COMMON_H
#define COMMON_H
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
#ifdef HAVE_AV_CONFIG_H
/* only include the following when compiling package */
# include "config.h"
# include <stdlib.h>
# include <stdio.h>
# include <string.h>
# include <ctype.h>
# include <limits.h>
# ifndef __BEOS__
# include <errno.h>
# else
# include "berrno.h"
# endif
# include <math.h>
#endif /* HAVE_AV_CONFIG_H */
/* Suppress restrict if it was not defined in config.h. */
#ifndef restrict
# define restrict
#endif
#ifndef always_inline
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define always_inline __attribute__((always_inline)) inline
#else
# define always_inline inline
#endif
#endif
#ifndef attribute_used
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define attribute_used __attribute__((used))
#else
# define attribute_used
#endif
#endif
#ifndef attribute_unused
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define attribute_unused __attribute__((unused))
#else
# define attribute_unused
#endif
#endif
#ifndef attribute_deprecated
#if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
# define attribute_deprecated __attribute__((deprecated))
#else
# define attribute_deprecated
#endif
#endif
#ifndef EMULATE_INTTYPES
# include <inttypes.h>
#else
typedef signed char int8_t;
typedef signed short int16_t;
typedef signed int int32_t;
typedef unsigned char uint8_t;
typedef unsigned short uint16_t;
typedef unsigned int uint32_t;
typedef signed long long int64_t;
typedef unsigned long long uint64_t;
#endif /* EMULATE_INTTYPES */
#ifndef PRId64
#define PRId64 "lld"
#endif
#ifndef PRIu64
#define PRIu64 "llu"
#endif
#ifndef PRIx64
#define PRIx64 "llx"
#endif
#ifndef PRId32
#define PRId32 "d"
#endif
#ifndef PRIdFAST16
#define PRIdFAST16 PRId32
#endif
#ifndef PRIdFAST32
#define PRIdFAST32 PRId32
#endif
#ifndef INT16_MIN
#define INT16_MIN (-0x7fff-1)
#endif
#ifndef INT16_MAX
#define INT16_MAX 0x7fff
#endif
#ifndef INT32_MIN
#define INT32_MIN (-0x7fffffff-1)
#endif
#ifndef INT32_MAX
#define INT32_MAX 0x7fffffff
#endif
#ifndef UINT32_MAX
#define UINT32_MAX 0xffffffff
#endif
#ifndef INT64_MIN
#define INT64_MIN (-0x7fffffffffffffffLL-1)
#endif
#ifndef INT64_MAX
#define INT64_MAX int64_t_C(9223372036854775807)
#endif
#ifndef UINT64_MAX
#define UINT64_MAX uint64_t_C(0xFFFFFFFFFFFFFFFF)
#endif
#ifdef EMULATE_FAST_INT
typedef signed char int_fast8_t;
typedef signed int int_fast16_t;
typedef signed int int_fast32_t;
typedef unsigned char uint_fast8_t;
typedef unsigned int uint_fast16_t;
typedef unsigned int uint_fast32_t;
typedef uint64_t uint_fast64_t;
#endif
#ifndef INT_BIT
# if INT_MAX != 2147483647
# define INT_BIT 64
# else
# define INT_BIT 32
# endif
#endif
#ifndef int64_t_C
#define int64_t_C(c) (c ## LL)
#define uint64_t_C(c) (c ## ULL)
#endif
#if defined(__MINGW32__) && !defined(BUILD_AVUTIL) && defined(BUILD_SHARED_AV)
# define FF_IMPORT_ATTR __declspec(dllimport)
#else
# define FF_IMPORT_ATTR
#endif
#ifdef HAVE_AV_CONFIG_H
/* only include the following when compiling package */
# include "internal.h"
#endif
//rounded divison & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b))
/* assume b>0 */
#define ROUNDED_DIV(a,b) (((a)>0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b))
#define ABS(a) ((a) >= 0 ? (a) : (-(a)))
#define FFMAX(a,b) ((a) > (b) ? (a) : (b))
#define FFMIN(a,b) ((a) > (b) ? (b) : (a))
#define SWAP(type,a,b) do{type SWAP_tmp= b; b= a; a= SWAP_tmp;}while(0)
/* misc math functions */
extern FF_IMPORT_ATTR const uint8_t ff_log2_tab[256];
static inline int av_log2(unsigned int v)
{
int n;
n = 0;
if (v & 0xffff0000) {
v >>= 16;
n += 16;
}
if (v & 0xff00) {
v >>= 8;
n += 8;
}
n += ff_log2_tab[v];
return n;
}
static inline int av_log2_16bit(unsigned int v)
{
int n;
n = 0;
if (v & 0xff00) {
v >>= 8;
n += 8;
}
n += ff_log2_tab[v];
return n;
}
/* median of 3 */
static inline int mid_pred(int a, int b, int c)
{
#if (defined(ARCH_X86) && __CPU__ >= 686 || defined(ARCH_X86_64)) && !defined(RUNTIME_CPUDETECT)
int i=a, j=a;
asm volatile(
"cmp %4, %2 \n\t"
"cmovg %4, %0 \n\t"
"cmovl %4, %1 \n\t"
"cmp %4, %3 \n\t"
"cmovg %3, %0 \n\t"
"cmovl %3, %1 \n\t"
"cmp %3, %2 \n\t"
"cmovl %1, %0 \n\t"
:"+&r"(i), "+&r"(j)
:"r"(a), "r"(b), "r"(c)
);
return i;
#elif 0
int t= (a-b)&((a-b)>>31);
a-=t;
b+=t;
b-= (b-c)&((b-c)>>31);
b+= (a-b)&((a-b)>>31);
return b;
#else
if(a>b){
if(c>b){
if(c>a) b=a;
else b=c;
}
}else{
if(b>c){
if(c>a) b=c;
else b=a;
}
}
return b;
#endif
}
/**
* clip a signed integer value into the amin-amax range
* @param a value to clip
* @param amin minimum value of the clip range
* @param amax maximum value of the clip range
* @return cliped value
*/
static inline int clip(int a, int amin, int amax)
{
if (a < amin) return amin;
else if (a > amax) return amax;
else return a;
}
/**
* clip a signed integer value into the 0-255 range
* @param a value to clip
* @return cliped value
*/
static inline uint8_t clip_uint8(int a)
{
if (a&(~255)) return (-a)>>31;
else return a;
}
/* math */
int64_t ff_gcd(int64_t a, int64_t b);
/**
* converts fourcc string to int
*/
static inline int ff_get_fourcc(const char *s){
#ifdef HAVE_AV_CONFIG_H
assert( strlen(s)==4 );
#endif
return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
}
#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)\
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;\
}\
}
#if defined(ARCH_X86) || defined(ARCH_X86_64) || defined(ARCH_POWERPC)
#if defined(ARCH_X86_64)
static inline uint64_t read_time(void)
{
uint64_t a, d;
asm volatile( "rdtsc\n\t"
: "=a" (a), "=d" (d)
);
return (d << 32) | (a & 0xffffffff);
}
#elif defined(ARCH_X86)
static inline long long read_time(void)
{
long long l;
asm volatile( "rdtsc\n\t"
: "=A" (l)
);
return l;
}
#else //FIXME check ppc64
static inline uint64_t read_time(void)
{
uint32_t tbu, tbl, temp;
/* from section 2.2.1 of the 32-bit PowerPC PEM */
__asm__ __volatile__(
"1:\n"
"mftbu %2\n"
"mftb %0\n"
"mftbu %1\n"
"cmpw %2,%1\n"
"bne 1b\n"
: "=r"(tbl), "=r"(tbu), "=r"(temp)
:
: "cc");
return (((uint64_t)tbu)<<32) | (uint64_t)tbl;
}
#endif
#define START_TIMER \
uint64_t tend;\
uint64_t tstart= read_time();\
#define STOP_TIMER(id) \
tend= read_time();\
{\
static uint64_t tsum=0;\
static int tcount=0;\
static int tskip_count=0;\
if(tcount<2 || tend - tstart < 8*tsum/tcount){\
tsum+= tend - tstart;\
tcount++;\
}else\
tskip_count++;\
if(256*256*256*64%(tcount+tskip_count)==0){\
av_log(NULL, AV_LOG_DEBUG, "%"PRIu64" dezicycles in %s, %d runs, %d skips\n", tsum*10/tcount, id, tcount, tskip_count);\
}\
}
#else
#define START_TIMER
#define STOP_TIMER(id) {}
#endif
/* memory */
#ifdef __GNUC__
#define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
#else
#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
#endif
void *av_malloc(unsigned int size);
void *av_realloc(void *ptr, unsigned int size);
void av_free(void *ptr);
#endif /* COMMON_H */