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ffmpeg/libavutil/internal.h

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/*
* 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
// This can be enabled to allow detection of additional integer overflows with ubsan
//#define CHECKED
#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"
#include "pixfmt.h"
#include "version.h"
#if ARCH_X86
# include "x86/emms.h"
#endif
#ifndef emms_c
# define emms_c()
#endif
#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
#if HAVE_PRAGMA_DEPRECATED
# if defined(__ICL) || defined (__INTEL_COMPILER)
# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
# elif defined(_MSC_VER)
# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
# else
# define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
# define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
# endif
#else
# define FF_DISABLE_DEPRECATION_WARNINGS
# define FF_ENABLE_DEPRECATION_WARNINGS
#endif
#ifndef INT_BIT
# define INT_BIT (CHAR_BIT * sizeof(int))
#endif
#define FF_MEMORY_POISON 0x2a
#define MAKE_ACCESSORS(str, name, type, field) \
type av_##name##_get_##field(const str *s) { return s->field; } \
void av_##name##_set_##field(str *s, type v) { s->field = v; }
// Some broken preprocessors need a second expansion
// to be forced to tokenize __VA_ARGS__
#define E1(x) x
/* Check if the hard coded offset of a struct member still matches reality.
* Induce a compilation failure if not.
*/
#define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
int x_##o[offsetof(s, m) == o? 1: -1]; \
}
#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
uint8_t la_##v[sizeof(t s o) + (a)]; \
t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
DECLARE_ALIGNED(a, t, la_##v) s o; \
t (*v) o = la_##v
#define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
#if HAVE_LOCAL_ALIGNED_8
# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
#else
# define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
#endif
#if HAVE_LOCAL_ALIGNED_16
# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
#else
# define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
#endif
#if HAVE_LOCAL_ALIGNED_32
# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
#else
# define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
#endif
#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
{\
p = av_malloc(size);\
if (!(p) && (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) && (size) != 0) {\
av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
goto label;\
}\
}
#define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
{\
p = av_malloc_array(nelem, elsize);\
if (!p) {\
av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
goto label;\
}\
}
#define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
{\
p = av_mallocz_array(nelem, elsize);\
if (!p) {\
av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
goto label;\
}\
}
#include "libm.h"
#if defined(_MSC_VER)
#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
#endif
/**
* 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
/**
* Log a generic warning message about a missing feature.
*
* @param[in] avc a pointer to an arbitrary struct of which the first
* field is a pointer to an AVClass struct
* @param[in] msg string containing the name of the missing feature
*/
void avpriv_report_missing_feature(void *avc,
const char *msg, ...) av_printf_format(2, 3);
/**
* Log a generic warning message about a missing feature.
* Additionally request that a sample showcasing the feature be uploaded.
*
* @param[in] avc a pointer to an arbitrary struct of which the first field is
* a pointer to an AVClass struct
* @param[in] msg string containing the name of the missing feature
*/
void avpriv_request_sample(void *avc,
const char *msg, ...) av_printf_format(2, 3);
#if HAVE_LIBC_MSVCRT
#define avpriv_open ff_open
#define PTRDIFF_SPECIFIER "Id"
#define SIZE_SPECIFIER "Iu"
#else
#define PTRDIFF_SPECIFIER "td"
#define SIZE_SPECIFIER "zu"
#endif
// For debuging we use signed operations so overflows can be detected (by ubsan)
// For production we use unsigned so there are no undefined operations
#ifdef CHECKED
#define SUINT int
#define SUINT32 int32_t
#else
#define SUINT unsigned
#define SUINT32 uint32_t
#endif
/**
* A wrapper for open() setting O_CLOEXEC.
*/
int avpriv_open(const char *filename, int flags, ...);
int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
#if FF_API_GET_CHANNEL_LAYOUT_COMPAT
uint64_t ff_get_channel_layout(const char *name, int compat);
#endif
#endif /* AVUTIL_INTERNAL_H */
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