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
80 // Some broken preprocessors need a second expansion
81 // to be forced to tokenize __VA_ARGS__
84 /* Check if the hard coded offset of a struct member still matches reality.
85 * Induce a compilation failure if not.
87 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
88 int x_##o[offsetof(s, m) == o? 1: -1]; \
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)
95 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
96 DECLARE_ALIGNED(a, t, la_##v) s o; \
99 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
101 #if HAVE_LOCAL_ALIGNED_8
102 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
104 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
107 #if HAVE_LOCAL_ALIGNED_16
108 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
110 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
113 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
115 p = av_malloc(size);\
116 if (!(p) && (size) != 0) {\
117 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
122 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
124 p = av_mallocz(size);\
125 if (!(p) && (size) != 0) {\
126 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
133 #if defined(_MSC_VER)
134 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
135 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
139 * Return NULL if CONFIG_SMALL is true, otherwise the argument
140 * without modification. Used to disable the definition of strings
141 * (for example AVCodec long_names).
144 # define NULL_IF_CONFIG_SMALL(x) NULL
146 # define NULL_IF_CONFIG_SMALL(x) x
151 * Define a function with only the non-default version specified.
153 * On systems with ELF shared libraries, all symbols exported from
154 * Libav libraries are tagged with the name and major version of the
155 * library to which they belong. If a function is moved from one
156 * library to another, a wrapper must be retained in the original
157 * location to preserve binary compatibility.
159 * Functions defined with this macro will never be used to resolve
160 * symbols by the build-time linker.
162 * @param type return type of function
163 * @param name name of function
164 * @param args argument list of function
165 * @param ver version tag to assign function
167 #if HAVE_SYMVER_ASM_LABEL
168 # define FF_SYMVER(type, name, args, ver) \
169 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
171 #elif HAVE_SYMVER_GNU_ASM
172 # define FF_SYMVER(type, name, args, ver) \
173 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
174 type ff_##name args; \
179 * Return NULL if a threading library has not been enabled.
180 * Used to disable threading functions in AVCodec definitions
184 # define ONLY_IF_THREADS_ENABLED(x) x
186 # define ONLY_IF_THREADS_ENABLED(x) NULL
190 * Log a generic warning message about a missing feature.
192 * @param[in] avc a pointer to an arbitrary struct of which the first
193 * field is a pointer to an AVClass struct
194 * @param[in] msg string containing the name of the missing feature
196 void avpriv_report_missing_feature(void *avc,
197 const char *msg, ...) av_printf_format(2, 3);
200 * Log a generic warning message about a missing feature.
201 * Additionally request that a sample showcasing the feature be uploaded.
203 * @param[in] avc a pointer to an arbitrary struct of which the first field is
204 * a pointer to an AVClass struct
205 * @param[in] msg string containing the name of the missing feature
207 void avpriv_request_sample(void *avc,
208 const char *msg, ...) av_printf_format(2, 3);
211 #define avpriv_open ff_open
215 * A wrapper for open() setting O_CLOEXEC.
217 int avpriv_open(const char *filename, int flags, ...);
219 int avpriv_set_systematic_pal2(uint32_t pal[256], enum AVPixelFormat pix_fmt);
221 #endif /* AVUTIL_INTERNAL_H */