configure: Support MSVC 2015
[libav.git] / libavutil / internal.h
1 /*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
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
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file
23 * common internal API header
24 */
25
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
28
29 #if !defined(DEBUG) && !defined(NDEBUG)
30 # define NDEBUG
31 #endif
32
33 #include <limits.h>
34 #include <stdint.h>
35 #include <stddef.h>
36 #include <assert.h>
37 #include "config.h"
38 #include "attributes.h"
39 #include "dict.h"
40 #include "pixfmt.h"
41
42 #if ARCH_X86
43 # include "x86/emms.h"
44 #endif
45
46 #ifndef emms_c
47 # define emms_c()
48 #endif
49
50 #ifndef attribute_align_arg
51 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
52 # define attribute_align_arg __attribute__((force_align_arg_pointer))
53 #else
54 # define attribute_align_arg
55 #endif
56 #endif
57
58 #if defined(_MSC_VER) && CONFIG_SHARED
59 # define av_export __declspec(dllimport)
60 #else
61 # define av_export
62 #endif
63
64 #if HAVE_PRAGMA_DEPRECATED
65 # if defined(__ICL)
66 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
67 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
68 # elif defined(_MSC_VER)
69 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
70 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
71 # else
72 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
73 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
74 # endif
75 #else
76 # define FF_DISABLE_DEPRECATION_WARNINGS
77 # define FF_ENABLE_DEPRECATION_WARNINGS
78 #endif
79
80 // Some broken preprocessors need a second expansion
81 // to be forced to tokenize __VA_ARGS__
82 #define E1(x) x
83
84 /* Check if the hard coded offset of a struct member still matches reality.
85 * Induce a compilation failure if not.
86 */
87 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
88 int x_##o[offsetof(s, m) == o? 1: -1]; \
89 }
90
91 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
92 uint8_t la_##v[sizeof(t s o) + (a)]; \
93 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
94
95 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
96 DECLARE_ALIGNED(a, t, la_##v) s o; \
97 t (*v) o = la_##v
98
99 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
100
101 #if HAVE_LOCAL_ALIGNED_8
102 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
103 #else
104 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
105 #endif
106
107 #if HAVE_LOCAL_ALIGNED_16
108 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
109 #else
110 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
111 #endif
112
113 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
114 {\
115 p = av_malloc(size);\
116 if (!(p) && (size) != 0) {\
117 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
118 goto label;\
119 }\
120 }
121
122 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
123 {\
124 p = av_mallocz(size);\
125 if (!(p) && (size) != 0) {\
126 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
127 goto label;\
128 }\
129 }
130
131 #include "libm.h"
132
133 /**
134 * Return NULL if CONFIG_SMALL is true, otherwise the argument
135 * without modification. Used to disable the definition of strings
136 * (for example AVCodec long_names).
137 */
138 #if CONFIG_SMALL
139 # define NULL_IF_CONFIG_SMALL(x) NULL
140 #else
141 # define NULL_IF_CONFIG_SMALL(x) x
142 #endif
143
144
145 /**
146 * Define a function with only the non-default version specified.
147 *
148 * On systems with ELF shared libraries, all symbols exported from
149 * Libav libraries are tagged with the name and major version of the
150 * library to which they belong. If a function is moved from one
151 * library to another, a wrapper must be retained in the original
152 * location to preserve binary compatibility.
153 *
154 * Functions defined with this macro will never be used to resolve
155 * symbols by the build-time linker.
156 *
157 * @param type return type of function
158 * @param name name of function
159 * @param args argument list of function
160 * @param ver version tag to assign function
161 */
162 #if HAVE_SYMVER_ASM_LABEL
163 # define FF_SYMVER(type, name, args, ver) \
164 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
165 type ff_##name args
166 #elif HAVE_SYMVER_GNU_ASM
167 # define FF_SYMVER(type, name, args, ver) \
168 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
169 type ff_##name args; \
170 type ff_##name args
171 #endif
172
173 /**
174 * Return NULL if a threading library has not been enabled.
175 * Used to disable threading functions in AVCodec definitions
176 * when not needed.
177 */
178 #if HAVE_THREADS
179 # define ONLY_IF_THREADS_ENABLED(x) x
180 #else
181 # define ONLY_IF_THREADS_ENABLED(x) NULL
182 #endif
183
184 /**
185 * Log a generic warning message about a missing feature.
186 *
187 * @param[in] avc a pointer to an arbitrary struct of which the first
188 * field is a pointer to an AVClass struct
189 * @param[in] msg string containing the name of the missing feature
190 */
191 void avpriv_report_missing_feature(void *avc,
192 const char *msg, ...) av_printf_format(2, 3);
193
194 /**
195 * Log a generic warning message about a missing feature.
196 * Additionally request that a sample showcasing the feature be uploaded.
197 *
198 * @param[in] avc a pointer to an arbitrary struct of which the first field is
199 * a pointer to an AVClass struct
200 * @param[in] msg string containing the name of the missing feature
201 */
202 void avpriv_request_sample(void *avc,
203 const char *msg, ...) av_printf_format(2, 3);
204
205 #if HAVE_LIBC_MSVCRT
206 #include <crtversion.h>
207 #if defined(_VC_CRT_MAJOR_VERSION) && _VC_CRT_MAJOR_VERSION < 14
208 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
209 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
210 #endif
211
212 #define avpriv_open ff_open
213 #endif
214
215 /**
216 * A wrapper for open() setting O_CLOEXEC.
217 */
218 int avpriv_open(const char *filename, int flags, ...);
219
220 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
221
222 #endif /* AVUTIL_INTERNAL_H */