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https://git.videolan.org/git/ffmpeg.git
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abf1c058d1
We currently only have exported data symbols within libavcodec, but the concept is easy to extend to other libraries if necessary. The attribute declaration needs to be in a private header though, since we can't use CONFIG_SHARED in public installed headers. Signed-off-by: Martin Storsjö <martin@martin.st>
225 lines
6.9 KiB
C
225 lines
6.9 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#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 "config.h"
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#include "attributes.h"
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#include "dict.h"
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#include "macros.h"
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#include "mem.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()
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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 HAVE_PRAGMA_DEPRECATED
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# if defined(__ICL)
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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 ignored \"-Wdeprecated-declarations\"")
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# define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
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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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// Some broken preprocessors need a second expansion
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// to be forced to tokenize __VA_ARGS__
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#define E1(x) x
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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 LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
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uint8_t la_##v[sizeof(t s o) + (a)]; \
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t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
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#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
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DECLARE_ALIGNED(a, t, la_##v) s o; \
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t (*v) o = la_##v
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#define LOCAL_ALIGNED(a, t, v, ...) LOCAL_ALIGNED_##a(t, v, __VA_ARGS__)
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#if HAVE_LOCAL_ALIGNED_8
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_A(8, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED_16
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_A(16, t, v, __VA_ARGS__,,))
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#endif
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#if HAVE_LOCAL_ALIGNED_32
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
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#else
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# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_A(32, t, v, __VA_ARGS__,,))
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#endif
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#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
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{\
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p = av_malloc(size);\
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if (!(p) && (size) != 0) {\
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
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goto label;\
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}\
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}
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#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
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{\
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p = av_mallocz(size);\
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if (!(p) && (size) != 0) {\
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av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
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goto label;\
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}\
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}
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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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* Libav 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_open ff_open
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#endif
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/**
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* A wrapper for open() setting O_CLOEXEC.
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*/
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int avpriv_open(const char *filename, int flags, ...);
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int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
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#endif /* AVUTIL_INTERNAL_H */
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