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DEFINITIONS
This source file includes following definitions.
- FASTDIV
- FASTDIV
- ff_sqrt
- llrint
- lrint
- lrintf
- round
- roundf
- truncf
/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file libavutil/internal.h
* common internal API header
*/
#ifndef AVUTIL_INTERNAL_H
#define AVUTIL_INTERNAL_H
#if !defined(DEBUG) && !defined(NDEBUG)
# define NDEBUG
#endif
#include <limits.h>
#include <stdint.h>
#include <stddef.h>
#include <assert.h>
#include "config.h"
#include "common.h"
#include "mem.h"
#include "timer.h"
#ifndef attribute_align_arg
#if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,2)
# define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
# define attribute_align_arg
#endif
#endif
#ifndef attribute_used
#if AV_GCC_VERSION_AT_LEAST(3,1)
# define attribute_used __attribute__((used))
#else
# define attribute_used
#endif
#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_C(9223372036854775807)
#endif
#ifndef UINT64_MAX
#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
#endif
#ifndef INT_BIT
# define INT_BIT (CHAR_BIT * sizeof(int))
#endif
#if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
# define PIC
#endif
#ifndef offsetof
# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
#endif
// Use rip-relative addressing if compiling PIC code on x86-64.
#if ARCH_X86_64 && defined(PIC)
# define LOCAL_MANGLE(a) #a "(%%rip)"
#else
# define LOCAL_MANGLE(a) #a
#endif
#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
/* debug stuff */
/* dprintf macros */
#ifdef DEBUG
# define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
#else
# define dprintf(pctx, ...)
#endif
#define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
/* math */
extern const uint32_t ff_inverse[256];
#if ARCH_X86
# define FASTDIV(a,b) \
({\
int ret,dmy;\
__asm__ volatile(\
"mull %3"\
:"=d"(ret),"=a"(dmy)\
:"1"(a),"g"(ff_inverse[b])\
);\
ret;\
})
#elif HAVE_ARMV6
static inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile("cmp %3, #2 \n\t"
"ldr %1, [%4, %3, lsl #2] \n\t"
"lsrle %0, %2, #1 \n\t"
"smmulgt %0, %1, %2 \n\t"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
return r;
}
#elif ARCH_ARM
static inline av_const int FASTDIV(int a, int b)
{
int r, t;
__asm__ volatile ("umull %1, %0, %2, %3"
: "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
return r;
}
#elif CONFIG_FASTDIV
# define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
#else
# define FASTDIV(a,b) ((a)/(b))
#endif
extern const uint8_t ff_sqrt_tab[256];
static inline av_const unsigned int ff_sqrt(unsigned int a)
{
unsigned int b;
if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
#if !CONFIG_SMALL
else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
#endif
else{
int s= av_log2_16bit(a>>16)>>1;
unsigned int c= a>>(s+2);
b= ff_sqrt_tab[c>>(s+8)];
b= FASTDIV(c,b) + (b<<s);
}
return b - (a<b*b);
}
#if ARCH_X86
#define MASK_ABS(mask, level)\
__asm__ volatile(\
"cltd \n\t"\
"xorl %1, %0 \n\t"\
"subl %1, %0 \n\t"\
: "+a" (level), "=&d" (mask)\
);
#else
#define MASK_ABS(mask, level)\
mask= level>>31;\
level= (level^mask)-mask;
#endif
#if HAVE_CMOV
#define COPY3_IF_LT(x,y,a,b,c,d)\
__asm__ volatile (\
"cmpl %0, %3 \n\t"\
"cmovl %3, %0 \n\t"\
"cmovl %4, %1 \n\t"\
"cmovl %5, %2 \n\t"\
: "+&r" (x), "+&r" (a), "+r" (c)\
: "r" (y), "r" (b), "r" (d)\
);
#else
#define COPY3_IF_LT(x,y,a,b,c,d)\
if((y)<(x)){\
(x)=(y);\
(a)=(b);\
(c)=(d);\
}
#endif
/* avoid usage of dangerous/inappropriate system functions */
#undef malloc
#define malloc please_use_av_malloc
#undef free
#define free please_use_av_free
#undef realloc
#define realloc please_use_av_realloc
#undef time
#define time time_is_forbidden_due_to_security_issues
#undef rand
#define rand rand_is_forbidden_due_to_state_trashing_use_av_random
#undef srand
#define srand srand_is_forbidden_due_to_state_trashing_use_av_random_init
#undef random
#define random random_is_forbidden_due_to_state_trashing_use_av_random
#undef sprintf
#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
#undef strcat
#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
#undef exit
#define exit exit_is_forbidden
#ifndef LIBAVFORMAT_BUILD
#undef printf
#define printf please_use_av_log_instead_of_printf
#undef fprintf
#define fprintf please_use_av_log_instead_of_fprintf
#undef puts
#define puts please_use_av_log_instead_of_puts
#undef perror
#define perror please_use_av_log_instead_of_perror
#endif
#define CHECKED_ALLOCZ(p, size)\
{\
p= av_mallocz(size);\
if(p==NULL && (size)!=0){\
av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
goto fail;\
}\
}
#if defined(__ICC) || defined(__SUNPRO_C)
#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
#define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
#elif defined(__GNUC__)
#define DECLARE_ALIGNED(n,t,v) t __attribute__ ((aligned (n))) v
#define DECLARE_ASM_CONST(n,t,v) static const t attribute_used __attribute__ ((aligned (n))) v
#elif defined(_MSC_VER)
#define DECLARE_ALIGNED(n,t,v) __declspec(align(n)) t v
#define DECLARE_ASM_CONST(n,t,v) __declspec(align(n)) static const t v
#elif HAVE_INLINE_ASM
#error The asm code needs alignment, but we do not know how to do it for this compiler.
#else
#define DECLARE_ALIGNED(n,t,v) t v
#define DECLARE_ASM_CONST(n,t,v) static const t v
#endif
#if !HAVE_LLRINT
static av_always_inline av_const long long llrint(double x)
{
return rint(x);
}
#endif /* HAVE_LLRINT */
#if !HAVE_LRINT
static av_always_inline av_const long int lrint(double x)
{
return rint(x);
}
#endif /* HAVE_LRINT */
#if !HAVE_LRINTF
static av_always_inline av_const long int lrintf(float x)
{
return (int)(rint(x));
}
#endif /* HAVE_LRINTF */
#if !HAVE_ROUND
static av_always_inline av_const double round(double x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_ROUND */
#if !HAVE_ROUNDF
static av_always_inline av_const float roundf(float x)
{
return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
}
#endif /* HAVE_ROUNDF */
#if !HAVE_TRUNCF
static av_always_inline av_const float truncf(float x)
{
return (x > 0) ? floor(x) : ceil(x);
}
#endif /* HAVE_TRUNCF */
/**
* Returns NULL if CONFIG_SMALL is true, otherwise the argument
* without modification. Used to disable the definition of strings
* (for example AVCodec long_names).
*/
#if CONFIG_SMALL
# define NULL_IF_CONFIG_SMALL(x) NULL
#else
# define NULL_IF_CONFIG_SMALL(x) x
#endif
#endif /* AVUTIL_INTERNAL_H */