PeerStreamer

/*

 * 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 to export labels from asm. */

#define LABEL_MANGLE(a) EXTERN_PREFIX #a

// 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 && HAVE_INLINE_ASM

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 && HAVE_INLINE_ASM

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_lfg_get

#undef  srand

#define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init

#undef  random

#define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get

#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 v __attribute__ ((aligned (n)))

    #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v

#elif defined(__GNUC__)

    #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))

    #define DECLARE_ASM_CONST(n,t,v)    static const t v attribute_used __attribute__ ((aligned (n)))

#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 */