FFmpeg/libavutil/internal.h

/*
 * 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 internal.h
 * common internal api header.
 */

#ifndef AVUTIL_INTERNAL_H
#define AVUTIL_INTERNAL_H

#if !defined(DEBUG) && !defined(NDEBUG)
#    define NDEBUG
#endif

#include <stdint.h>
#include <stddef.h>
#include <assert.h>

#ifndef attribute_align_arg
#if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
#    define attribute_align_arg __attribute__((force_align_arg_pointer))
#else
#    define attribute_align_arg
#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 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
#    if INT_MAX != 2147483647
#        define INT_BIT 64
#    else
#        define INT_BIT 32
#    endif
#endif

#if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
#    define PIC
#endif

#include "config.h"
#include "intreadwrite.h"
#include "bswap.h"

#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 defined(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 defined(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 defined(HAVE_ARMV6)
static inline av_const int FASTDIV(int a, int b)
{
    int r;
    asm volatile("cmp   %2, #0        \n\t"
                 "smmul %0, %1, %2    \n\t"
                 "rsblt %0, %0, #0    \n\t"
                 : "=r"(r) : "r"(a), "r"(ff_inverse[b]));
    return r;
}
#elif defined(ARCH_ARMV4L)
#    define FASTDIV(a,b) \
    ({\
        int ret,dmy;\
        asm volatile(\
            "umull %1, %0, %2, %3"\
            :"=&r"(ret),"=&r"(dmy)\
            :"r"(a),"r"(ff_inverse[b])\
            );\
        ret;\
    })
#elif defined(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 int av_log2_16bit(unsigned int v);

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;
#ifndef 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 defined(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

#ifdef 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 various 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_init_random
#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
#undef  fprintf
#define fprintf please_use_av_log
#undef  puts
#define puts please_use_av_log
#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;\
    }\
}

#ifndef HAVE_LLRINT
static av_always_inline av_const long long llrint(double x)
{
    return rint(x);
}
#endif /* HAVE_LLRINT */

#ifndef HAVE_LRINT
static av_always_inline av_const long int lrint(double x)
{
    return rint(x);
}
#endif /* HAVE_LRINT */

#ifndef HAVE_LRINTF
static av_always_inline av_const long int lrintf(float x)
{
    return (int)(rint(x));
}
#endif /* HAVE_LRINTF */

#ifndef 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 */

#ifndef 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 */

#endif /* AVUTIL_INTERNAL_H */