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"
45 # include "x86/emms.h"
52 #ifndef attribute_align_arg
53 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
54 # define attribute_align_arg __attribute__((force_align_arg_pointer))
56 # define attribute_align_arg
60 #if defined(_MSC_VER) && CONFIG_SHARED
61 # define av_export __declspec(dllimport)
66 #if HAVE_PRAGMA_DEPRECATED
67 # if defined(__ICL) || defined (__INTEL_COMPILER)
68 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:1478))
69 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
70 # elif defined(_MSC_VER)
71 # define FF_DISABLE_DEPRECATION_WARNINGS __pragma(warning(push)) __pragma(warning(disable:4996))
72 # define FF_ENABLE_DEPRECATION_WARNINGS __pragma(warning(pop))
74 # define FF_DISABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
75 # define FF_ENABLE_DEPRECATION_WARNINGS _Pragma("GCC diagnostic warning \"-Wdeprecated-declarations\"")
78 # define FF_DISABLE_DEPRECATION_WARNINGS
79 # define FF_ENABLE_DEPRECATION_WARNINGS
83 # define INT_BIT (CHAR_BIT * sizeof(int))
86 #define FF_MEMORY_POISON 0x2a
88 #define MAKE_ACCESSORS(str, name, type, field) \
89 type av_##name##_get_##field(const str *s) { return s->field; } \
90 void av_##name##_set_##field(str *s, type v) { s->field = v; }
92 // Some broken preprocessors need a second expansion
93 // to be forced to tokenize __VA_ARGS__
96 /* Check if the hard coded offset of a struct member still matches reality.
97 * Induce a compilation failure if not.
99 #define AV_CHECK_OFFSET(s, m, o) struct check_##o { \
100 int x_##o[offsetof(s, m) == o? 1: -1]; \
103 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
104 uint8_t la_##v[sizeof(t s o) + (a)]; \
105 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
107 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
108 DECLARE_ALIGNED(a, t, la_##v) s o; \
111 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
113 #if HAVE_LOCAL_ALIGNED_8
114 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
116 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
119 #if HAVE_LOCAL_ALIGNED_16
120 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
122 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
125 #if HAVE_LOCAL_ALIGNED_32
126 # define LOCAL_ALIGNED_32(t, v, ...) E1(LOCAL_ALIGNED_D(32, t, v, __VA_ARGS__,,))
128 # define LOCAL_ALIGNED_32(t, v, ...) LOCAL_ALIGNED(32, t, v, __VA_ARGS__)
131 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
133 p = av_malloc(size);\
134 if (p == NULL && (size) != 0) {\
135 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
140 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
142 p = av_mallocz(size);\
143 if (p == NULL && (size) != 0) {\
144 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
149 #define FF_ALLOC_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
151 p = av_malloc_array(nelem, elsize);\
153 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
158 #define FF_ALLOCZ_ARRAY_OR_GOTO(ctx, p, nelem, elsize, label)\
160 p = av_mallocz_array(nelem, elsize);\
162 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
169 #if defined(_MSC_VER)
170 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
171 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
175 * Return NULL if CONFIG_SMALL is true, otherwise the argument
176 * without modification. Used to disable the definition of strings
177 * (for example AVCodec long_names).
180 # define NULL_IF_CONFIG_SMALL(x) NULL
182 # define NULL_IF_CONFIG_SMALL(x) x
186 * Define a function with only the non-default version specified.
188 * On systems with ELF shared libraries, all symbols exported from
189 * FFmpeg libraries are tagged with the name and major version of the
190 * library to which they belong. If a function is moved from one
191 * library to another, a wrapper must be retained in the original
192 * location to preserve binary compatibility.
194 * Functions defined with this macro will never be used to resolve
195 * symbols by the build-time linker.
197 * @param type return type of function
198 * @param name name of function
199 * @param args argument list of function
200 * @param ver version tag to assign function
202 #if HAVE_SYMVER_ASM_LABEL
203 # define FF_SYMVER(type, name, args, ver) \
204 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
206 #elif HAVE_SYMVER_GNU_ASM
207 # define FF_SYMVER(type, name, args, ver) \
208 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
209 type ff_##name args; \
214 * Return NULL if a threading library has not been enabled.
215 * Used to disable threading functions in AVCodec definitions
219 # define ONLY_IF_THREADS_ENABLED(x) x
221 # define ONLY_IF_THREADS_ENABLED(x) NULL
225 * Log a generic warning message about a missing feature.
227 * @param[in] avc a pointer to an arbitrary struct of which the first
228 * field is a pointer to an AVClass struct
229 * @param[in] msg string containing the name of the missing feature
231 void avpriv_report_missing_feature(void *avc,
232 const char *msg, ...) av_printf_format(2, 3);
235 * Log a generic warning message about a missing feature.
236 * Additionally request that a sample showcasing the feature be uploaded.
238 * @param[in] avc a pointer to an arbitrary struct of which the first field is
239 * a pointer to an AVClass struct
240 * @param[in] msg string containing the name of the missing feature
242 void avpriv_request_sample(void *avc,
243 const char *msg, ...) av_printf_format(2, 3);
246 #define avpriv_open ff_open
247 #define PTRDIFF_SPECIFIER "Id"
248 #define SIZE_SPECIFIER "Iu"
250 #define PTRDIFF_SPECIFIER "td"
251 #define SIZE_SPECIFIER "zu"
255 * A wrapper for open() setting O_CLOEXEC.
257 int avpriv_open(const char *filename, int flags, ...);
259 #if FF_API_GET_CHANNEL_LAYOUT_COMPAT
260 uint64_t ff_get_channel_layout(const char *name, int compat);
263 #endif /* AVUTIL_INTERNAL_H */