/*
  * 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

  * 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 "attributes.h"

 #include "timer.h"

 #include "cpu.h"

 #include "dict.h"
 

 #ifndef attribute_align_arg

 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)

 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
 #else
 #    define attribute_align_arg
 #endif
 #endif
 

 #if defined(_MSC_VER) && CONFIG_SHARED
 #    define av_export __declspec(dllimport)
 #else
 #    define av_export
 #endif
 

 #ifndef INT_BIT

 #    define INT_BIT (CHAR_BIT * sizeof(int))

 #endif
 

 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\

 {\

     p = av_malloc(size);\
     if (p == NULL && (size) != 0) {\

         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\

     }\
 }
 

 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\

 {\

     p = av_mallocz(size);\
     if (p == NULL && (size) != 0) {\

         av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
         goto label;\

     }\
 }
 

 #include "libm.h"

 /**

  * Return 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
 

 /**

  * Define a function with only the non-default version specified.
  *
  * On systems with ELF shared libraries, all symbols exported from
  * FFmpeg libraries are tagged with the name and major version of the
  * library to which they belong.  If a function is moved from one
  * library to another, a wrapper must be retained in the original
  * location to preserve binary compatibility.
  *
  * Functions defined with this macro will never be used to resolve
  * symbols by the build-time linker.
  *
  * @param type return type of function
  * @param name name of function
  * @param args argument list of function
  * @param ver  version tag to assign function

  */

 #if HAVE_SYMVER_ASM_LABEL

 #   define FF_SYMVER(type, name, args, ver)                     \
     type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \

     type ff_##name args
 #elif HAVE_SYMVER_GNU_ASM

 #   define FF_SYMVER(type, name, args, ver)                             \
     __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
     type ff_##name args;                                                \

     type ff_##name args
 #endif
 

 /**

  * Return NULL if a threading library has not been enabled.

  * Used to disable threading functions in AVCodec definitions
  * when not needed.
  */
 #if HAVE_THREADS
 #   define ONLY_IF_THREADS_ENABLED(x) x
 #else
 #   define ONLY_IF_THREADS_ENABLED(x) NULL
 #endif
 

 #if HAVE_MMX_INLINE

 /**
  * Empty mmx state.
  * this must be called between any dsp function and float/double code.
  * for example sin(); dsp->idct_put(); emms_c(); cos()
  */
 static av_always_inline void emms_c(void)
 {

     if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
         __asm__ volatile ("emms" ::: "memory");

 }

 #elif HAVE_MMX && HAVE_MM_EMPTY
 #   include <mmintrin.h>
 #   define emms_c _mm_empty

 #else

 #   define emms_c()

 #endif /* HAVE_MMX_INLINE */

 #endif /* AVUTIL_INTERNAL_H */