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"
43 #ifndef attribute_align_arg
44 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
45 # define attribute_align_arg __attribute__((force_align_arg_pointer))
47 # define attribute_align_arg
52 # define INT_BIT (CHAR_BIT * sizeof(int))
55 /* avoid usage of dangerous/inappropriate system functions */
57 #define malloc please_use_av_malloc
59 #define free please_use_av_free
61 #define realloc please_use_av_realloc
63 #define time time_is_forbidden_due_to_security_issues
65 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
67 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
69 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
71 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
73 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
75 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
77 #define exit exit_is_forbidden
79 #define printf please_use_av_log_instead_of_printf
81 #define fprintf please_use_av_log_instead_of_fprintf
83 #define puts please_use_av_log_instead_of_puts
85 #define perror please_use_av_log_instead_of_perror
87 #define strcasecmp please_use_av_strcasecmp
89 #define strncasecmp please_use_av_strncasecmp
91 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
94 if (p == NULL && (size) != 0) {\
95 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
100 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
102 p = av_mallocz(size);\
103 if (p == NULL && (size) != 0) {\
104 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
112 * Return NULL if CONFIG_SMALL is true, otherwise the argument
113 * without modification. Used to disable the definition of strings
114 * (for example AVCodec long_names).
117 # define NULL_IF_CONFIG_SMALL(x) NULL
119 # define NULL_IF_CONFIG_SMALL(x) x
123 * Define a function with only the non-default version specified.
125 * On systems with ELF shared libraries, all symbols exported from
126 * FFmpeg libraries are tagged with the name and major version of the
127 * library to which they belong. If a function is moved from one
128 * library to another, a wrapper must be retained in the original
129 * location to preserve binary compatibility.
131 * Functions defined with this macro will never be used to resolve
132 * symbols by the build-time linker.
134 * @param type return type of function
135 * @param name name of function
136 * @param args argument list of function
137 * @param ver version tag to assign function
139 #if HAVE_SYMVER_ASM_LABEL
140 # define FF_SYMVER(type, name, args, ver) \
141 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
143 #elif HAVE_SYMVER_GNU_ASM
144 # define FF_SYMVER(type, name, args, ver) \
145 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
146 type ff_##name args; \
151 * Return NULL if a threading library has not been enabled.
152 * Used to disable threading functions in AVCodec definitions
156 # define ONLY_IF_THREADS_ENABLED(x) x
158 # define ONLY_IF_THREADS_ENABLED(x) NULL
161 #if HAVE_MMX && HAVE_INLINE_ASM
164 * this must be called between any dsp function and float/double code.
165 * for example sin(); dsp->idct_put(); emms_c(); cos()
167 static av_always_inline void emms_c(void)
169 if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
170 __asm__ volatile ("emms" ::: "memory");
172 #elif HAVE_MMX && HAVE_MM_EMPTY
173 # include <mmintrin.h>
174 # define emms_c _mm_empty
177 #endif /* HAVE_MMX */
179 #endif /* AVUTIL_INTERNAL_H */