libavutil/internal.h - third_party/ffmpeg - Git at Google

 /*
  * 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"

 struct AVDictionary {
     int count;
     AVDictionaryEntry *elems;
 };

 #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

 #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

 #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 */

 #define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)

 /* math */

 #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

 /* 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  strncpy
 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
 #undef  exit
 #define exit exit_is_forbidden
 #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
 #undef strcasecmp
 #define strcasecmp please_use_av_strcasecmp
 #undef strncasecmp
 #define strncasecmp please_use_av_strncasecmp

 #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
 /**
  * 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");
 }
 #else /* HAVE_MMX */
 #define emms_c()
 #endif /* HAVE_MMX */

 #endif /* AVUTIL_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
	* 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"

	struct AVDictionary {
	int count;
	AVDictionaryEntry *elems;
	};

	#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

	#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

	#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 */

	#define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)

	/* math */

	#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

	/* 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 strncpy
	#define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
	#undef exit
	#define exit exit_is_forbidden
	#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
	#undef strcasecmp
	#define strcasecmp please_use_av_strcasecmp
	#undef strncasecmp
	#define strncasecmp please_use_av_strncasecmp

	#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
	/**
	* 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");
	}
	#else /* HAVE_MMX */
	#define emms_c()
	#endif /* HAVE_MMX */

	#endif /* AVUTIL_INTERNAL_H */