/*
  * 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 */