2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
4 * This file is part of FFmpeg.
6 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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"
44 # include "x86/emms.h"
51 #ifndef attribute_align_arg
52 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
53 # define attribute_align_arg __attribute__((force_align_arg_pointer))
55 # define attribute_align_arg
59 #if defined(_MSC_VER) && CONFIG_SHARED
60 # define av_export __declspec(dllimport)
65 #if HAVE_PRAGMA_DEPRECATED
66 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
67 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
69 # define FF_DISABLE_DEPRECATION_WARNINGS
70 # define FF_ENABLE_DEPRECATION_WARNINGS
74 # define INT_BIT (CHAR_BIT * sizeof(int))
77 #define FF_MEMORY_POISON 0x2a
79 #define MAKE_ACCESSORS(str, name, type, field) \
80 type av_##name##_get_##field(const str *s) { return s->field; } \
81 void av_##name##_set_##field(str *s, type v) { s->field = v; }
83 // Some broken preprocessors need a second expansion
84 // to be forced to tokenize __VA_ARGS__
87 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
88 uint8_t la_##v[sizeof(t s o) + (a)]; \
89 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
91 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
92 DECLARE_ALIGNED(a, t, la_##v) s o; \
95 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
97 #if HAVE_LOCAL_ALIGNED_8
98 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
100 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
103 #if HAVE_LOCAL_ALIGNED_16
104 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
106 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
109 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
111 p = av_malloc(size);\
112 if (p == NULL && (size) != 0) {\
113 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
118 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
120 p = av_mallocz(size);\
121 if (p == NULL && (size) != 0) {\
122 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
129 #if defined(_MSC_VER)
130 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
131 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
135 * Return NULL if CONFIG_SMALL is true, otherwise the argument
136 * without modification. Used to disable the definition of strings
137 * (for example AVCodec long_names).
140 # define NULL_IF_CONFIG_SMALL(x) NULL
142 # define NULL_IF_CONFIG_SMALL(x) x
146 * Define a function with only the non-default version specified.
148 * On systems with ELF shared libraries, all symbols exported from
149 * FFmpeg 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.
154 * Functions defined with this macro will never be used to resolve
155 * symbols by the build-time linker.
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
162 #if HAVE_SYMVER_ASM_LABEL
163 # define FF_SYMVER(type, name, args, ver) \
164 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
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; \
174 * Return NULL if a threading library has not been enabled.
175 * Used to disable threading functions in AVCodec definitions
179 # define ONLY_IF_THREADS_ENABLED(x) x
181 # define ONLY_IF_THREADS_ENABLED(x) NULL
185 * Log a generic warning message about a missing feature.
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
191 void avpriv_report_missing_feature(void *avc,
192 const char *msg, ...) av_printf_format(2, 3);
195 * Log a generic warning message about a missing feature.
196 * Additionally request that a sample showcasing the feature be uploaded.
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
202 void avpriv_request_sample(void *avc,
203 const char *msg, ...) av_printf_format(2, 3);
206 #define avpriv_open ff_open
210 * A wrapper for open() setting O_CLOEXEC.
212 int avpriv_open(const char *filename, int flags, ...);
214 #endif /* AVUTIL_INTERNAL_H */