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))
95 /* Use to export labels from asm. */
96 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
98 // Use rip-relative addressing if compiling PIC code on x86-64.
99 #if ARCH_X86_64 && defined(PIC)
100 # define LOCAL_MANGLE(a) #a "(%%rip)"
102 # define LOCAL_MANGLE(a) #a
105 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
109 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
114 #define MASK_ABS(mask, level)\
119 : "+a" (level), "=&d" (mask)\
122 #define MASK_ABS(mask, level)\
124 level = (level ^ mask) - mask;
127 /* avoid usage of dangerous/inappropriate system functions */
129 #define malloc please_use_av_malloc
131 #define free please_use_av_free
133 #define realloc please_use_av_realloc
135 #define time time_is_forbidden_due_to_security_issues
137 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
139 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
141 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
143 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
145 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
147 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
149 #define exit exit_is_forbidden
151 #define printf please_use_av_log_instead_of_printf
153 #define fprintf please_use_av_log_instead_of_fprintf
155 #define puts please_use_av_log_instead_of_puts
157 #define perror please_use_av_log_instead_of_perror
159 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
161 p = av_malloc(size);\
162 if (p == NULL && (size) != 0) {\
163 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
168 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
170 p = av_mallocz(size);\
171 if (p == NULL && (size) != 0) {\
172 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
180 * Return NULL if CONFIG_SMALL is true, otherwise the argument
181 * without modification. Used to disable the definition of strings
182 * (for example AVCodec long_names).
185 # define NULL_IF_CONFIG_SMALL(x) NULL
187 # define NULL_IF_CONFIG_SMALL(x) x
192 * Define a function with only the non-default version specified.
194 * On systems with ELF shared libraries, all symbols exported from
195 * Libav libraries are tagged with the name and major version of the
196 * library to which they belong. If a function is moved from one
197 * library to another, a wrapper must be retained in the original
198 * location to preserve binary compatibility.
200 * Functions defined with this macro will never be used to resolve
201 * symbols by the build-time linker.
203 * @param type return type of function
204 * @param name name of function
205 * @param args argument list of function
206 * @param ver version tag to assign function
208 #if HAVE_SYMVER_ASM_LABEL
209 # define FF_SYMVER(type, name, args, ver) \
210 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
212 #elif HAVE_SYMVER_GNU_ASM
213 # define FF_SYMVER(type, name, args, ver) \
214 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
215 type ff_##name args; \
220 * Returns NULL if a threading library has not been enabled.
221 * Used to disable threading functions in AVCodec definitions
225 # define ONLY_IF_THREADS_ENABLED(x) x
227 # define ONLY_IF_THREADS_ENABLED(x) NULL
233 * this must be called between any dsp function and float/double code.
234 * for example sin(); dsp->idct_put(); emms_c(); cos()
236 static av_always_inline void emms_c(void)
238 __asm__ volatile ("emms" ::: "memory");
242 #endif /* HAVE_MMX */
244 #endif /* AVUTIL_INTERNAL_H */