/* * 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 <stdio.h>#include "config.h"#include "attributes.h"#include "libm.h"#include "macros.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(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avutil)#    define av_export_avutil __declspec(dllimport)#else#    define av_export_avutil#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 push") _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")#        define FF_ENABLE_DEPRECATION_WARNINGS  _Pragma("GCC diagnostic pop")#    endif#else#    define FF_DISABLE_DEPRECATION_WARNINGS#    define FF_ENABLE_DEPRECATION_WARNINGS#endif  #define FF_ALLOC_TYPED_ARRAY(p, nelem)  (p = av_malloc_array(nelem, sizeof(*p)))#define FF_ALLOCZ_TYPED_ARRAY(p, nelem) (p = av_calloc(nelem, sizeof(*p))) #define FF_PTR_ADD(ptr, off) ((off) ? (ptr) + (off) : (ptr)) /** * Access a field in a structure by its offset. */#define FF_FIELD_AT(type, off, obj) (*(type *)((char *)&(obj) + (off))) /** * Return NULL if CONFIG_SMALL is true, otherwise the argument * without modification. Used to disable the definition of strings. */#if CONFIG_SMALL#   define NULL_IF_CONFIG_SMALL(x) NULL#else#   define NULL_IF_CONFIG_SMALL(x) x#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#include <crtversion.h>#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")#endif #define PTRDIFF_SPECIFIER "Id"#define SIZE_SPECIFIER "Iu"#else#define PTRDIFF_SPECIFIER "td"#define SIZE_SPECIFIER "zu"#endif #ifdef DEBUG#   define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)#else#   define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)#endif #ifdef TRACE#   define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)#else#   define ff_tlog(ctx, ...) do { } while(0)#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 static av_always_inline av_const int avpriv_mirror(int x, int w){    if (!w)        return 0;     while ((unsigned)x > (unsigned)w) {        x = -x;        if (x < 0)            x += 2 * w;    }    return x;} #endif /* AVUTIL_INTERNAL_H */