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)
65 # define INT_BIT (CHAR_BIT * sizeof(int))
68 // Some broken preprocessors need a second expansion
69 // to be forced to tokenize __VA_ARGS__
72 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
73 uint8_t la_##v[sizeof(t s o) + (a)]; \
74 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
76 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
77 DECLARE_ALIGNED(a, t, la_##v) s o; \
80 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
82 #if HAVE_LOCAL_ALIGNED_8
83 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
85 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
88 #if HAVE_LOCAL_ALIGNED_16
89 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
91 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
94 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
97 if (p == NULL && (size) != 0) {\
98 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
103 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
105 p = av_mallocz(size);\
106 if (p == NULL && (size) != 0) {\
107 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
114 #if defined(_MSC_VER) && !CONFIG_SHARED
115 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
116 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
120 * Return NULL if CONFIG_SMALL is true, otherwise the argument
121 * without modification. Used to disable the definition of strings
122 * (for example AVCodec long_names).
125 # define NULL_IF_CONFIG_SMALL(x) NULL
127 # define NULL_IF_CONFIG_SMALL(x) x
132 * Define a function with only the non-default version specified.
134 * On systems with ELF shared libraries, all symbols exported from
135 * Libav libraries are tagged with the name and major version of the
136 * library to which they belong. If a function is moved from one
137 * library to another, a wrapper must be retained in the original
138 * location to preserve binary compatibility.
140 * Functions defined with this macro will never be used to resolve
141 * symbols by the build-time linker.
143 * @param type return type of function
144 * @param name name of function
145 * @param args argument list of function
146 * @param ver version tag to assign function
148 #if HAVE_SYMVER_ASM_LABEL
149 # define FF_SYMVER(type, name, args, ver) \
150 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
152 #elif HAVE_SYMVER_GNU_ASM
153 # define FF_SYMVER(type, name, args, ver) \
154 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
155 type ff_##name args; \
160 * Return NULL if a threading library has not been enabled.
161 * Used to disable threading functions in AVCodec definitions
165 # define ONLY_IF_THREADS_ENABLED(x) x
167 # define ONLY_IF_THREADS_ENABLED(x) NULL
171 * Log a generic warning message about a missing feature.
173 * @param[in] avc a pointer to an arbitrary struct of which the first
174 * field is a pointer to an AVClass struct
175 * @param[in] msg string containing the name of the missing feature
177 void avpriv_report_missing_feature(void *avc,
178 const char *msg, ...) av_printf_format(2, 3);
181 * Log a generic warning message about a missing feature.
182 * Additionally request that a sample showcasing the feature be uploaded.
184 * @param[in] avc a pointer to an arbitrary struct of which the first field is
185 * a pointer to an AVClass struct
186 * @param[in] msg string containing the name of the missing feature
188 void avpriv_request_sample(void *avc,
189 const char *msg, ...) av_printf_format(2, 3);
191 #endif /* AVUTIL_INTERNAL_H */