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
65 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
66 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
68 # define FF_DISABLE_DEPRECATION_WARNINGS
69 # define FF_ENABLE_DEPRECATION_WARNINGS
73 # define INT_BIT (CHAR_BIT * sizeof(int))
76 // Some broken preprocessors need a second expansion
77 // to be forced to tokenize __VA_ARGS__
80 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
81 uint8_t la_##v[sizeof(t s o) + (a)]; \
82 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
84 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
85 DECLARE_ALIGNED(a, t, la_##v) s o; \
88 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
90 #if HAVE_LOCAL_ALIGNED_8
91 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
93 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
96 #if HAVE_LOCAL_ALIGNED_16
97 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
99 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
102 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
104 p = av_malloc(size);\
105 if (p == NULL && (size) != 0) {\
106 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
111 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
113 p = av_mallocz(size);\
114 if (p == NULL && (size) != 0) {\
115 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
122 #if defined(_MSC_VER)
123 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
124 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
128 * Return NULL if CONFIG_SMALL is true, otherwise the argument
129 * without modification. Used to disable the definition of strings
130 * (for example AVCodec long_names).
133 # define NULL_IF_CONFIG_SMALL(x) NULL
135 # define NULL_IF_CONFIG_SMALL(x) x
140 * Define a function with only the non-default version specified.
142 * On systems with ELF shared libraries, all symbols exported from
143 * Libav libraries are tagged with the name and major version of the
144 * library to which they belong. If a function is moved from one
145 * library to another, a wrapper must be retained in the original
146 * location to preserve binary compatibility.
148 * Functions defined with this macro will never be used to resolve
149 * symbols by the build-time linker.
151 * @param type return type of function
152 * @param name name of function
153 * @param args argument list of function
154 * @param ver version tag to assign function
156 #if HAVE_SYMVER_ASM_LABEL
157 # define FF_SYMVER(type, name, args, ver) \
158 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
160 #elif HAVE_SYMVER_GNU_ASM
161 # define FF_SYMVER(type, name, args, ver) \
162 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
163 type ff_##name args; \
168 * Return NULL if a threading library has not been enabled.
169 * Used to disable threading functions in AVCodec definitions
173 # define ONLY_IF_THREADS_ENABLED(x) x
175 # define ONLY_IF_THREADS_ENABLED(x) NULL
179 * Log a generic warning message about a missing feature.
181 * @param[in] avc a pointer to an arbitrary struct of which the first
182 * field is a pointer to an AVClass struct
183 * @param[in] msg string containing the name of the missing feature
185 void avpriv_report_missing_feature(void *avc,
186 const char *msg, ...) av_printf_format(2, 3);
189 * Log a generic warning message about a missing feature.
190 * Additionally request that a sample showcasing the feature be uploaded.
192 * @param[in] avc a pointer to an arbitrary struct of which the first field is
193 * a pointer to an AVClass struct
194 * @param[in] msg string containing the name of the missing feature
196 void avpriv_request_sample(void *avc,
197 const char *msg, ...) av_printf_format(2, 3);
200 #define avpriv_open ff_open
204 * A wrapper for open() setting O_CLOEXEC.
206 int avpriv_open(const char *filename, int flags, ...);
208 #endif /* AVUTIL_INTERNAL_H */