lavu: add LOCAL_ALIGNED_32
[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"
d9f80ea2 39#include "dict.h"
50078c1c 40#include "macros.h"
bb41115d 41#include "pixfmt.h"
d9f80ea2 42
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43#if ARCH_X86
44# include "x86/emms.h"
45#endif
46
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47#ifndef emms_c
48# define emms_c()
49#endif
50
5e4c7ca2 51#ifndef attribute_align_arg
820818a3 52#if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
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53# define attribute_align_arg __attribute__((force_align_arg_pointer))
54#else
55# define attribute_align_arg
56#endif
57#endif
58
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59#if defined(_MSC_VER) && CONFIG_SHARED
60# define av_export __declspec(dllimport)
61#else
62# define av_export
63#endif
64
3a7050ff 65#if HAVE_PRAGMA_DEPRECATED
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66# if defined(__ICL)
67# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
68# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
69# elif defined(_MSC_VER)
70# define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
71# define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
72# else
73# define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
74# define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
75# endif
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76#else
77# define FF_DISABLE_DEPRECATION_WARNINGS
78# define FF_ENABLE_DEPRECATION_WARNINGS
79#endif
80
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81// Some broken preprocessors need a second expansion
82// to be forced to tokenize __VA_ARGS__
fd1abf42 83#define E1(x) x
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84
85/* Check if the hard coded offset of a struct member still matches reality.
86 * Induce a compilation failure if not.
87 */
88#define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
89 int x_##o[offsetof(s, m) == o? 1: -1]; \
90 }
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91
92#define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
93 uint8_t la_##v[sizeof(t s o) + (a)]; \
94 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
95
96#define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
97 DECLARE_ALIGNED(a, t, la_##v) s o; \
98 t (*v) o = la_##v
99
fd1abf42 100#define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
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101
102#if HAVE_LOCAL_ALIGNED_8
fd1abf42 103# define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
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104#else
105# define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
106#endif
107
108#if HAVE_LOCAL_ALIGNED_16
fd1abf42 109# define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
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110#else
111# define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
112#endif
113
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114#if HAVE_LOCAL_ALIGNED_32
115# define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
116#else
117# define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
118#endif
119
d31dbec3 120#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
e48a0966 121{\
ee155011 122 p = av_malloc(size);\
f929ab05 123 if (!(p) && (size) != 0) {\
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124 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
125 goto label;\
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126 }\
127}
128
d31dbec3 129#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
05020c89 130{\
ee155011 131 p = av_mallocz(size);\
f929ab05 132 if (!(p) && (size) != 0) {\
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133 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
134 goto label;\
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135 }\
136}
137
335ee1aa 138#include "libm.h"
7b04b8a0 139
d80a7fe5 140/**
49bd8e4b 141 * Return NULL if CONFIG_SMALL is true, otherwise the argument
bfe3676f 142 * without modification. Used to disable the definition of strings
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143 * (for example AVCodec long_names).
144 */
145#if CONFIG_SMALL
146# define NULL_IF_CONFIG_SMALL(x) NULL
147#else
148# define NULL_IF_CONFIG_SMALL(x) x
149#endif
150
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151
152/**
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153 * Define a function with only the non-default version specified.
154 *
155 * On systems with ELF shared libraries, all symbols exported from
2912e87a 156 * Libav libraries are tagged with the name and major version of the
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157 * library to which they belong. If a function is moved from one
158 * library to another, a wrapper must be retained in the original
159 * location to preserve binary compatibility.
160 *
161 * Functions defined with this macro will never be used to resolve
162 * symbols by the build-time linker.
163 *
164 * @param type return type of function
165 * @param name name of function
166 * @param args argument list of function
167 * @param ver version tag to assign function
33586ee7 168 */
b462d132 169#if HAVE_SYMVER_ASM_LABEL
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170# define FF_SYMVER(type, name, args, ver) \
171 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
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172 type ff_##name args
173#elif HAVE_SYMVER_GNU_ASM
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174# define FF_SYMVER(type, name, args, ver) \
175 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
176 type ff_##name args; \
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177 type ff_##name args
178#endif
179
37b00b47 180/**
58c42af7 181 * Return NULL if a threading library has not been enabled.
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182 * Used to disable threading functions in AVCodec definitions
183 * when not needed.
184 */
185#if HAVE_THREADS
186# define ONLY_IF_THREADS_ENABLED(x) x
187#else
188# define ONLY_IF_THREADS_ENABLED(x) NULL
189#endif
190
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191/**
192 * Log a generic warning message about a missing feature.
193 *
194 * @param[in] avc a pointer to an arbitrary struct of which the first
195 * field is a pointer to an AVClass struct
196 * @param[in] msg string containing the name of the missing feature
197 */
198void avpriv_report_missing_feature(void *avc,
199 const char *msg, ...) av_printf_format(2, 3);
200
201/**
202 * Log a generic warning message about a missing feature.
203 * Additionally request that a sample showcasing the feature be uploaded.
204 *
205 * @param[in] avc a pointer to an arbitrary struct of which the first field is
206 * a pointer to an AVClass struct
207 * @param[in] msg string containing the name of the missing feature
208 */
209void avpriv_request_sample(void *avc,
210 const char *msg, ...) av_printf_format(2, 3);
211
d64341e4 212#if HAVE_LIBC_MSVCRT
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213#include <crtversion.h>
214#if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
215#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
216#pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
217#endif
218
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219#define avpriv_open ff_open
220#endif
221
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222/**
223 * A wrapper for open() setting O_CLOEXEC.
224 */
225int avpriv_open(const char *filename, int flags, ...);
226
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227int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
228
98790382 229#endif /* AVUTIL_INTERNAL_H */