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"
44 AVDictionaryEntry *elems;
47 #ifndef attribute_align_arg
48 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
49 # define attribute_align_arg __attribute__((force_align_arg_pointer))
51 # define attribute_align_arg
56 #define INT16_MIN (-0x7fff - 1)
60 #define INT16_MAX 0x7fff
64 #define INT32_MIN (-0x7fffffff - 1)
68 #define INT32_MAX 0x7fffffff
72 #define UINT32_MAX 0xffffffff
76 #define INT64_MIN (-0x7fffffffffffffffLL - 1)
80 #define INT64_MAX INT64_C(9223372036854775807)
84 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
88 # define INT_BIT (CHAR_BIT * sizeof(int))
92 # define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
97 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
101 #if ARCH_X86 && HAVE_INLINE_ASM
102 #define MASK_ABS(mask, level)\
107 : "+a" (level), "=&d" (mask)\
110 #define MASK_ABS(mask, level)\
112 level = (level ^ mask) - mask;
115 /* avoid usage of dangerous/inappropriate system functions */
117 #define malloc please_use_av_malloc
119 #define free please_use_av_free
121 #define realloc please_use_av_realloc
123 #define time time_is_forbidden_due_to_security_issues
125 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
127 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
129 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
131 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
133 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
135 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
137 #define exit exit_is_forbidden
139 #define printf please_use_av_log_instead_of_printf
141 #define fprintf please_use_av_log_instead_of_fprintf
143 #define puts please_use_av_log_instead_of_puts
145 #define perror please_use_av_log_instead_of_perror
147 #define strcasecmp please_use_av_strcasecmp
149 #define strncasecmp please_use_av_strncasecmp
151 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
153 p = av_malloc(size);\
154 if (p == NULL && (size) != 0) {\
155 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
160 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
162 p = av_mallocz(size);\
163 if (p == NULL && (size) != 0) {\
164 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
172 * Return NULL if CONFIG_SMALL is true, otherwise the argument
173 * without modification. Used to disable the definition of strings
174 * (for example AVCodec long_names).
177 # define NULL_IF_CONFIG_SMALL(x) NULL
179 # define NULL_IF_CONFIG_SMALL(x) x
184 * Define a function with only the non-default version specified.
186 * On systems with ELF shared libraries, all symbols exported from
187 * Libav libraries are tagged with the name and major version of the
188 * library to which they belong. If a function is moved from one
189 * library to another, a wrapper must be retained in the original
190 * location to preserve binary compatibility.
192 * Functions defined with this macro will never be used to resolve
193 * symbols by the build-time linker.
195 * @param type return type of function
196 * @param name name of function
197 * @param args argument list of function
198 * @param ver version tag to assign function
200 #if HAVE_SYMVER_ASM_LABEL
201 # define FF_SYMVER(type, name, args, ver) \
202 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
204 #elif HAVE_SYMVER_GNU_ASM
205 # define FF_SYMVER(type, name, args, ver) \
206 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
207 type ff_##name args; \
212 * Return NULL if a threading library has not been enabled.
213 * Used to disable threading functions in AVCodec definitions
217 # define ONLY_IF_THREADS_ENABLED(x) x
219 # define ONLY_IF_THREADS_ENABLED(x) NULL
222 #if HAVE_MMX && HAVE_INLINE_ASM
225 * this must be called between any dsp function and float/double code.
226 * for example sin(); dsp->idct_put(); emms_c(); cos()
228 static av_always_inline void emms_c(void)
230 __asm__ volatile ("emms" ::: "memory");
232 #elif HAVE_MMX && HAVE_MM_EMPTY
233 # include <mmintrin.h>
234 # define emms_c _mm_empty
237 #endif /* HAVE_MMX */
239 #endif /* AVUTIL_INTERNAL_H */