mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
168 lines
5.0 KiB
C
168 lines
5.0 KiB
C
/*
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* copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* common internal API header
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*/
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#ifndef AVUTIL_INTERNAL_H
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#define AVUTIL_INTERNAL_H
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#if !defined(DEBUG) && !defined(NDEBUG)
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# define NDEBUG
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#endif
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// This can be enabled to allow detection of additional integer overflows with ubsan
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//#define CHECKED
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#include <limits.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <assert.h>
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#include <stdio.h>
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#include "config.h"
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#include "attributes.h"
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#include "libm.h"
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#include "macros.h"
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#ifndef attribute_align_arg
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#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
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# define attribute_align_arg __attribute__((force_align_arg_pointer))
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#else
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# define attribute_align_arg
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#endif
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#endif
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#if defined(_WIN32) && CONFIG_SHARED && !defined(BUILDING_avutil)
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# define av_export_avutil __declspec(dllimport)
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#else
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# define av_export_avutil
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#endif
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#if HAVE_PRAGMA_DEPRECATED
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# if defined(__ICL) || defined (__INTEL_COMPILER)
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# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
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# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
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# elif defined(_MSC_VER)
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# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
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# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
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# else
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# define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
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# define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic pop")
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# endif
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#else
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# define FF_DISABLE_DEPRECATION_WARNINGS
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# define FF_ENABLE_DEPRECATION_WARNINGS
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#endif
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#define FF_ALLOC_TYPED_ARRAY(p, nelem) (p = av_malloc_array(nelem, sizeof(*p)))
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#define FF_ALLOCZ_TYPED_ARRAY(p, nelem) (p = av_calloc(nelem, sizeof(*p)))
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#define FF_PTR_ADD(ptr, off) ((off) ? (ptr) + (off) : (ptr))
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/**
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* Access a field in a structure by its offset.
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*/
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#define FF_FIELD_AT(type, off, obj) (*(type *)((char *)&(obj) + (off)))
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/**
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* Return NULL if CONFIG_SMALL is true, otherwise the argument
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* without modification. Used to disable the definition of strings.
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*/
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#if CONFIG_SMALL
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# define NULL_IF_CONFIG_SMALL(x) NULL
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#else
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# define NULL_IF_CONFIG_SMALL(x) x
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#endif
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/**
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* Log a generic warning message about a missing feature.
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*
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* @param[in] avc a pointer to an arbitrary struct of which the first
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* field is a pointer to an AVClass struct
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* @param[in] msg string containing the name of the missing feature
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*/
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void avpriv_report_missing_feature(void *avc,
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const char *msg, ...) av_printf_format(2, 3);
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/**
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* Log a generic warning message about a missing feature.
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* Additionally request that a sample showcasing the feature be uploaded.
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*
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* @param[in] avc a pointer to an arbitrary struct of which the first field is
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* a pointer to an AVClass struct
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* @param[in] msg string containing the name of the missing feature
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*/
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void avpriv_request_sample(void *avc,
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const char *msg, ...) av_printf_format(2, 3);
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#if HAVE_LIBC_MSVCRT
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#include <crtversion.h>
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#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
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#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_strtod")
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#pragma comment(linker, "/include:" EXTERN_PREFIX "avpriv_snprintf")
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#endif
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#define PTRDIFF_SPECIFIER "Id"
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#define SIZE_SPECIFIER "Iu"
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#else
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#define PTRDIFF_SPECIFIER "td"
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#define SIZE_SPECIFIER "zu"
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#endif
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#ifdef DEBUG
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# define ff_dlog(ctx, ...) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__)
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#else
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# define ff_dlog(ctx, ...) do { if (0) av_log(ctx, AV_LOG_DEBUG, __VA_ARGS__); } while (0)
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#endif
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#ifdef TRACE
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# define ff_tlog(ctx, ...) av_log(ctx, AV_LOG_TRACE, __VA_ARGS__)
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#else
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# define ff_tlog(ctx, ...) do { } while(0)
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#endif
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// For debuging we use signed operations so overflows can be detected (by ubsan)
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// For production we use unsigned so there are no undefined operations
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#ifdef CHECKED
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#define SUINT int
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#define SUINT32 int32_t
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#else
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#define SUINT unsigned
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#define SUINT32 uint32_t
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#endif
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static av_always_inline av_const int avpriv_mirror(int x, int w)
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{
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if (!w)
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return 0;
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while ((unsigned)x > (unsigned)w) {
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x = -x;
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if (x < 0)
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x += 2 * w;
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}
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return x;
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}
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#endif /* AVUTIL_INTERNAL_H */
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