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 INT_BIT (CHAR_BIT * sizeof(int))
61 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
63 /* avoid usage of dangerous/inappropriate system functions */
65 #define malloc please_use_av_malloc
67 #define free please_use_av_free
69 #define realloc please_use_av_realloc
71 #define time time_is_forbidden_due_to_security_issues
73 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
75 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
77 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
79 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
81 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
83 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
85 #define exit exit_is_forbidden
87 #define printf please_use_av_log_instead_of_printf
89 #define fprintf please_use_av_log_instead_of_fprintf
91 #define puts please_use_av_log_instead_of_puts
93 #define perror please_use_av_log_instead_of_perror
95 #define strcasecmp please_use_av_strcasecmp
97 #define strncasecmp please_use_av_strncasecmp
99 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
101 p = av_malloc(size);\
102 if (p == NULL && (size) != 0) {\
103 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
108 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
110 p = av_mallocz(size);\
111 if (p == NULL && (size) != 0) {\
112 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
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
170 #if HAVE_MMX && HAVE_INLINE_ASM
173 * this must be called between any dsp function and float/double code.
174 * for example sin(); dsp->idct_put(); emms_c(); cos()
176 static av_always_inline void emms_c(void)
178 __asm__ volatile ("emms" ::: "memory");
180 #elif HAVE_MMX && HAVE_MM_EMPTY
181 # include <mmintrin.h>
182 # define emms_c _mm_empty
185 #endif /* HAVE_MMX */
187 #endif /* AVUTIL_INTERNAL_H */