dsputil: Move WRAPPER8_16_SQ macro to the only place it is used
[libav.git] / libavutil / internal.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
2912e87a 4 * This file is part of Libav.
b78e7197 5 *
2912e87a 6 * Libav is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
b78e7197 9 * version 2.1 of the License, or (at your option) any later version.
04d7f601 10 *
2912e87a 11 * Libav is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
2912e87a 17 * License along with Libav; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
05020c89 21/**
ba87f080 22 * @file
89c9ff50 23 * common internal API header
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24 */
25
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26#ifndef AVUTIL_INTERNAL_H
27#define AVUTIL_INTERNAL_H
05020c89 28
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29#if !defined(DEBUG) && !defined(NDEBUG)
30# define NDEBUG
31#endif
32
ed0fd852 33#include <limits.h>
99545457 34#include <stdint.h>
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35#include <stddef.h>
36#include <assert.h>
dbef3f46 37#include "config.h"
2ed6f399 38#include "attributes.h"
2f5421d5 39#include "timer.h"
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40#include "dict.h"
41
5e4c7ca2 42#ifndef attribute_align_arg
820818a3 43#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
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44# define attribute_align_arg __attribute__((force_align_arg_pointer))
45#else
46# define attribute_align_arg
47#endif
48#endif
49
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50#if defined(_MSC_VER) && CONFIG_SHARED
51# define av_export __declspec(dllimport)
52#else
53# define av_export
54#endif
55
cd107896 56#ifndef INT_BIT
28499cc8 57# define INT_BIT (CHAR_BIT * sizeof(int))
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58#endif
59
d31dbec3 60#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
e48a0966 61{\
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62 p = av_malloc(size);\
63 if (p == NULL && (size) != 0) {\
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64 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
65 goto label;\
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66 }\
67}
68
d31dbec3 69#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
05020c89 70{\
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71 p = av_mallocz(size);\
72 if (p == NULL && (size) != 0) {\
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73 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
74 goto label;\
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75 }\
76}
77
335ee1aa 78#include "libm.h"
7b04b8a0 79
d80a7fe5 80/**
49bd8e4b 81 * Return NULL if CONFIG_SMALL is true, otherwise the argument
bfe3676f 82 * without modification. Used to disable the definition of strings
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83 * (for example AVCodec long_names).
84 */
85#if CONFIG_SMALL
86# define NULL_IF_CONFIG_SMALL(x) NULL
87#else
88# define NULL_IF_CONFIG_SMALL(x) x
89#endif
90
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91
92/**
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93 * Define a function with only the non-default version specified.
94 *
95 * On systems with ELF shared libraries, all symbols exported from
2912e87a 96 * Libav libraries are tagged with the name and major version of the
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97 * library to which they belong. If a function is moved from one
98 * library to another, a wrapper must be retained in the original
99 * location to preserve binary compatibility.
100 *
101 * Functions defined with this macro will never be used to resolve
102 * symbols by the build-time linker.
103 *
104 * @param type return type of function
105 * @param name name of function
106 * @param args argument list of function
107 * @param ver version tag to assign function
33586ee7 108 */
b462d132 109#if HAVE_SYMVER_ASM_LABEL
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110# define FF_SYMVER(type, name, args, ver) \
111 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
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112 type ff_##name args
113#elif HAVE_SYMVER_GNU_ASM
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114# define FF_SYMVER(type, name, args, ver) \
115 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
116 type ff_##name args; \
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117 type ff_##name args
118#endif
119
37b00b47 120/**
58c42af7 121 * Return NULL if a threading library has not been enabled.
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122 * Used to disable threading functions in AVCodec definitions
123 * when not needed.
124 */
125#if HAVE_THREADS
126# define ONLY_IF_THREADS_ENABLED(x) x
127#else
128# define ONLY_IF_THREADS_ENABLED(x) NULL
129#endif
130
17337f54 131#if HAVE_MMX_INLINE
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132/**
133 * Empty mmx state.
134 * this must be called between any dsp function and float/double code.
135 * for example sin(); dsp->idct_put(); emms_c(); cos()
136 */
137static av_always_inline void emms_c(void)
138{
139 __asm__ volatile ("emms" ::: "memory");
140}
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141#elif HAVE_MMX && HAVE_MM_EMPTY
142# include <mmintrin.h>
143# define emms_c _mm_empty
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144#elif HAVE_MMX && HAVE_YASM
145# include "libavutil/x86/emms.h"
146# define emms_c avpriv_emms_yasm
17337f54 147#else
f80ddd5b 148# define emms_c()
17337f54 149#endif /* HAVE_MMX_INLINE */
e9735572 150
98790382 151#endif /* AVUTIL_INTERNAL_H */