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)
66 # define INT_BIT (CHAR_BIT * sizeof(int))
69 #define FF_MEMORY_POISON 0x2a
71 // Some broken preprocessors need a second expansion
72 // to be forced to tokenize __VA_ARGS__
75 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
76 uint8_t la_##v[sizeof(t s o) + (a)]; \
77 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
79 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
80 DECLARE_ALIGNED(a, t, la_##v) s o; \
83 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
85 #if HAVE_LOCAL_ALIGNED_8
86 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
88 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
91 #if HAVE_LOCAL_ALIGNED_16
92 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
94 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
97 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
100 if (p == NULL && (size) != 0) {\
101 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
106 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
108 p = av_mallocz(size);\
109 if (p == NULL && (size) != 0) {\
110 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
117 #if defined(_MSC_VER) && !CONFIG_SHARED
118 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_strtod")
119 #pragma comment(linker, "/include:"EXTERN_PREFIX"avpriv_snprintf")
123 * Return NULL if CONFIG_SMALL is true, otherwise the argument
124 * without modification. Used to disable the definition of strings
125 * (for example AVCodec long_names).
128 # define NULL_IF_CONFIG_SMALL(x) NULL
130 # define NULL_IF_CONFIG_SMALL(x) x
134 * Define a function with only the non-default version specified.
136 * On systems with ELF shared libraries, all symbols exported from
137 * FFmpeg libraries are tagged with the name and major version of the
138 * library to which they belong. If a function is moved from one
139 * library to another, a wrapper must be retained in the original
140 * location to preserve binary compatibility.
142 * Functions defined with this macro will never be used to resolve
143 * symbols by the build-time linker.
145 * @param type return type of function
146 * @param name name of function
147 * @param args argument list of function
148 * @param ver version tag to assign function
150 #if HAVE_SYMVER_ASM_LABEL
151 # define FF_SYMVER(type, name, args, ver) \
152 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
154 #elif HAVE_SYMVER_GNU_ASM
155 # define FF_SYMVER(type, name, args, ver) \
156 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
157 type ff_##name args; \
162 * Return NULL if a threading library has not been enabled.
163 * Used to disable threading functions in AVCodec definitions
167 # define ONLY_IF_THREADS_ENABLED(x) x
169 # define ONLY_IF_THREADS_ENABLED(x) NULL
173 * Log a generic warning message about a missing feature.
175 * @param[in] avc a pointer to an arbitrary struct of which the first
176 * field is a pointer to an AVClass struct
177 * @param[in] msg string containing the name of the missing feature
179 void avpriv_report_missing_feature(void *avc,
180 const char *msg, ...) av_printf_format(2, 3);
183 * Log a generic warning message about a missing feature.
184 * Additionally request that a sample showcasing the feature be uploaded.
186 * @param[in] avc a pointer to an arbitrary struct of which the first field is
187 * a pointer to an AVClass struct
188 * @param[in] msg string containing the name of the missing feature
190 void avpriv_request_sample(void *avc,
191 const char *msg, ...) av_printf_format(2, 3);
193 #endif /* AVUTIL_INTERNAL_H */