61fbb4cd57
* commit '4db96649ca700db563d9da4ebe70bf9fc4c7a6ba': avutil: Ensure that emms_c is always defined, even on non-x86 configure: Move MinGW CPPFLAGS setting to libc section, where it belongs avutil: Move emms code to x86-specific header Conflicts: configure libavutil/internal.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
166 lines
4.6 KiB
C
166 lines
4.6 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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#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 "timer.h"
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#include "cpu.h"
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#include "dict.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 defined(_MSC_VER) && CONFIG_SHARED
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# define av_export __declspec(dllimport)
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#else
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# define av_export
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#endif
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#ifndef INT_BIT
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# define INT_BIT (CHAR_BIT * sizeof(int))
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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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#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, ...) E1(LOCAL_ALIGNED_A(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, ...) LOCAL_ALIGNED(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, ...) LOCAL_ALIGNED(16, 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 == NULL && (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 == NULL && (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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* 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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#endif /* AVUTIL_INTERNAL_H */
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