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/*
* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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"
#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
#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
* Libav 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
/**
* Returns 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)
{
__asm__ volatile ("emms" ::: "memory");
}
#else /* HAVE_MMX */
#define emms_c()
#endif /* HAVE_MMX */
#endif /* AVUTIL_INTERNAL_H */
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