mirror of
https://github.com/FFmpeg/FFmpeg.git
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4cdc14aa95
Since every DLL can use an individual CRT on Windows, having
an exported function that opens a FILE* won't work if that
FILE* is going to be used from a different DLL (or from user
application code).
Internally within the libraries, the issue can be worked around
by duplicating the function in all libraries (this already happened
implicitly because the function resided in file_open.c) and renaming
the function to ff_fopen_utf8 (so that it doesn't end up exported from
the DLLs) and duplicating it in all libraries that use it.
This makes the avpriv_fopen_utf8 / ff_fopen_utf8 function work in
the exact same way as the existing avpriv_open / ff_open, with the
same setup as introduced in e743e7ae6e.
That mechanism doesn't work for external users, thus deprecate the
existing function.
Signed-off-by: Martin Storsjö <martin@martin.st>
309 lines
9.6 KiB
C
309 lines
9.6 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 "timer.h"
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#include "dict.h"
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#include "macros.h"
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#include "pixfmt.h"
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#if ARCH_X86
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# include "x86/emms.h"
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#endif
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#ifndef emms_c
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# define emms_c() do {} while(0)
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#endif
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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_MEMORY_POISON 0x2a
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/* Check if the hard coded offset of a struct member still matches reality.
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* Induce a compilation failure if not.
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*/
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#define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
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int x_##o[offsetof(s, m) == o? 1: -1]; \
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}
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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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#include "libm.h"
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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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* (for example AVCodec long_names).
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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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* Define a function with only the non-default version specified.
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*
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* On systems with ELF shared libraries, all symbols exported from
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* FFmpeg libraries are tagged with the name and major version of the
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* library to which they belong. If a function is moved from one
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* library to another, a wrapper must be retained in the original
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* location to preserve binary compatibility.
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*
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* Functions defined with this macro will never be used to resolve
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* symbols by the build-time linker.
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*
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* @param type return type of function
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* @param name name of function
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* @param args argument list of function
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* @param ver version tag to assign function
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*/
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#if HAVE_SYMVER_ASM_LABEL
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# define FF_SYMVER(type, name, args, ver) \
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type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
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type ff_##name args
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#elif HAVE_SYMVER_GNU_ASM
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# define FF_SYMVER(type, name, args, ver) \
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__asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
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type ff_##name args; \
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type ff_##name args
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#endif
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/**
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* Return NULL if a threading library has not been enabled.
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* Used to disable threading functions in AVCodec definitions
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* when not needed.
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*/
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#if HAVE_THREADS
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# define ONLY_IF_THREADS_ENABLED(x) x
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#else
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# define ONLY_IF_THREADS_ENABLED(x) NULL
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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 avpriv_fopen_utf8 ff_fopen_utf8
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#define avpriv_open ff_open
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#define avpriv_tempfile ff_tempfile
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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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/**
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* Clip and convert a double value into the long long amin-amax range.
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* This function is needed because conversion of floating point to integers when
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* it does not fit in the integer's representation does not necessarily saturate
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* correctly (usually converted to a cvttsd2si on x86) which saturates numbers
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* > INT64_MAX to INT64_MIN. The standard marks such conversions as undefined
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* behavior, allowing this sort of mathematically bogus conversions. This provides
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* a safe alternative that is slower obviously but assures safety and better
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* mathematical behavior.
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* @param a value to clip
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* @param amin minimum value of the clip range
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* @param amax maximum value of the clip range
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* @return clipped value
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*/
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static av_always_inline av_const int64_t ff_rint64_clip(double a, int64_t amin, int64_t amax)
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{
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int64_t res;
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#if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2
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if (amin > amax) abort();
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#endif
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// INT64_MAX+1,INT64_MIN are exactly representable as IEEE doubles
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// do range checks first
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if (a >= 9223372036854775808.0)
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return amax;
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if (a <= -9223372036854775808.0)
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return amin;
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// safe to call llrint and clip accordingly
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res = llrint(a);
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if (res > amax)
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return amax;
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if (res < amin)
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return amin;
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return res;
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}
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/**
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* A wrapper for open() setting O_CLOEXEC.
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*/
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av_warn_unused_result
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int avpriv_open(const char *filename, int flags, ...);
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/**
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* Open a file using a UTF-8 filename.
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*/
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FILE *avpriv_fopen_utf8(const char *path, const char *mode);
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/**
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* Wrapper to work around the lack of mkstemp() on mingw.
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* Also, tries to create file in /tmp first, if possible.
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* *prefix can be a character constant; *filename will be allocated internally.
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* @return file descriptor of opened file (or negative value corresponding to an
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* AVERROR code on error)
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* and opened file name in **filename.
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* @note On very old libcs it is necessary to set a secure umask before
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* calling this, av_tempfile() can't call umask itself as it is used in
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* libraries and could interfere with the calling application.
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*/
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int avpriv_tempfile(const char *prefix, char **filename, int log_offset, void *log_ctx);
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int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
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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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void ff_check_pixfmt_descriptors(void);
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/**
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* Set a dictionary value to an ISO-8601 compliant timestamp string.
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*
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* @param dict pointer to a pointer to a dictionary struct. If *dict is NULL
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* a dictionary struct is allocated and put in *dict.
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* @param key metadata key
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* @param timestamp unix timestamp in microseconds
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* @return <0 on error
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*/
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int avpriv_dict_set_timestamp(AVDictionary **dict, const char *key, int64_t timestamp);
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#endif /* AVUTIL_INTERNAL_H */
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