2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of Libav.
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.
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.
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
23 * common internal API header
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
29 #if !defined(DEBUG) && !defined(NDEBUG)
38 #include "attributes.h"
43 # include "x86/emms.h"
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))
54 # define attribute_align_arg
58 #if defined(_MSC_VER) && CONFIG_SHARED
59 # define av_export __declspec(dllimport)
64 #if HAVE_PRAGMA_DEPRECATED
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))
72 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
73 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
76 # define FF_DISABLE_DEPRECATION_WARNINGS
77 # define FF_ENABLE_DEPRECATION_WARNINGS
81 # define INT_BIT (CHAR_BIT * sizeof(int))
84 // Some broken preprocessors need a second expansion
85 // to be forced to tokenize __VA_ARGS__
88 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
89 uint8_t la_##v[sizeof(t s o) + (a)]; \
90 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
92 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
93 DECLARE_ALIGNED(a, t, la_##v) s o; \
96 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
98 #if HAVE_LOCAL_ALIGNED_8
99 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
101 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
104 #if HAVE_LOCAL_ALIGNED_16
105 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
107 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
110 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
112 p = av_malloc(size);\
113 if (p == NULL && (size) != 0) {\
114 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
119 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
121 p = av_mallocz(size);\
122 if (p == NULL && (size) != 0) {\
123 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
130 #if defined(_MSC_VER)
131 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
132 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
136 * Return NULL if CONFIG_SMALL is true, otherwise the argument
137 * without modification. Used to disable the definition of strings
138 * (for example AVCodec long_names).
141 # define NULL_IF_CONFIG_SMALL(x) NULL
143 # define NULL_IF_CONFIG_SMALL(x) x
148 * Define a function with only the non-default version specified.
150 * On systems with ELF shared libraries, all symbols exported from
151 * Libav libraries are tagged with the name and major version of the
152 * library to which they belong. If a function is moved from one
153 * library to another, a wrapper must be retained in the original
154 * location to preserve binary compatibility.
156 * Functions defined with this macro will never be used to resolve
157 * symbols by the build-time linker.
159 * @param type return type of function
160 * @param name name of function
161 * @param args argument list of function
162 * @param ver version tag to assign function
164 #if HAVE_SYMVER_ASM_LABEL
165 # define FF_SYMVER(type, name, args, ver) \
166 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
168 #elif HAVE_SYMVER_GNU_ASM
169 # define FF_SYMVER(type, name, args, ver) \
170 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
171 type ff_##name args; \
176 * Return NULL if a threading library has not been enabled.
177 * Used to disable threading functions in AVCodec definitions
181 # define ONLY_IF_THREADS_ENABLED(x) x
183 # define ONLY_IF_THREADS_ENABLED(x) NULL
187 * Log a generic warning message about a missing feature.
189 * @param[in] avc a pointer to an arbitrary struct of which the first
190 * field is a pointer to an AVClass struct
191 * @param[in] msg string containing the name of the missing feature
193 void avpriv_report_missing_feature(void *avc,
194 const char *msg, ...) av_printf_format(2, 3);
197 * Log a generic warning message about a missing feature.
198 * Additionally request that a sample showcasing the feature be uploaded.
200 * @param[in] avc a pointer to an arbitrary struct of which the first field is
201 * a pointer to an AVClass struct
202 * @param[in] msg string containing the name of the missing feature
204 void avpriv_request_sample(void *avc,
205 const char *msg, ...) av_printf_format(2, 3);
208 #define avpriv_open ff_open
212 * A wrapper for open() setting O_CLOEXEC.
214 int avpriv_open(const char *filename, int flags, ...);
216 #endif /* AVUTIL_INTERNAL_H */