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"
45 AVDictionaryEntry *elems;
48 #ifndef attribute_align_arg
49 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
50 # define attribute_align_arg __attribute__((force_align_arg_pointer))
52 # define attribute_align_arg
57 #define INT16_MIN (-0x7fff - 1)
61 #define INT16_MAX 0x7fff
65 #define INT32_MIN (-0x7fffffff - 1)
69 #define INT32_MAX 0x7fffffff
73 #define UINT32_MAX 0xffffffff
77 #define INT64_MIN (-0x7fffffffffffffffLL - 1)
81 #define INT64_MAX INT64_C(9223372036854775807)
85 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
89 # define INT_BIT (CHAR_BIT * sizeof(int))
93 # define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
96 /* Use to export labels from asm. */
97 #define LABEL_MANGLE(a) EXTERN_PREFIX #a
99 // Use rip-relative addressing if compiling PIC code on x86-64.
100 #if ARCH_X86_64 && defined(PIC)
101 # define LOCAL_MANGLE(a) #a "(%%rip)"
103 # define LOCAL_MANGLE(a) #a
106 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
110 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
115 #define MASK_ABS(mask, level)\
120 : "+a" (level), "=&d" (mask)\
123 #define MASK_ABS(mask, level)\
125 level = (level ^ mask) - mask;
128 /* avoid usage of dangerous/inappropriate system functions */
130 #define malloc please_use_av_malloc
132 #define free please_use_av_free
134 #define realloc please_use_av_realloc
136 #define time time_is_forbidden_due_to_security_issues
138 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
140 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
142 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
144 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
146 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
148 #define strncpy strncpy_is_forbidden_due_to_security_issues_use_av_strlcpy
150 #define exit exit_is_forbidden
152 #define printf please_use_av_log_instead_of_printf
154 #define fprintf please_use_av_log_instead_of_fprintf
156 #define puts please_use_av_log_instead_of_puts
158 #define perror please_use_av_log_instead_of_perror
160 #define strcasecmp please_use_av_strcasecmp
162 #define strncasecmp please_use_av_strncasecmp
164 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
166 p = av_malloc(size);\
167 if (p == NULL && (size) != 0) {\
168 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
173 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
175 p = av_mallocz(size);\
176 if (p == NULL && (size) != 0) {\
177 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
185 * Return NULL if CONFIG_SMALL is true, otherwise the argument
186 * without modification. Used to disable the definition of strings
187 * (for example AVCodec long_names).
190 # define NULL_IF_CONFIG_SMALL(x) NULL
192 # define NULL_IF_CONFIG_SMALL(x) x
196 * Define a function with only the non-default version specified.
198 * On systems with ELF shared libraries, all symbols exported from
199 * FFmpeg libraries are tagged with the name and major version of the
200 * library to which they belong. If a function is moved from one
201 * library to another, a wrapper must be retained in the original
202 * location to preserve binary compatibility.
204 * Functions defined with this macro will never be used to resolve
205 * symbols by the build-time linker.
207 * @param type return type of function
208 * @param name name of function
209 * @param args argument list of function
210 * @param ver version tag to assign function
212 #if HAVE_SYMVER_ASM_LABEL
213 # define FF_SYMVER(type, name, args, ver) \
214 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
216 #elif HAVE_SYMVER_GNU_ASM
217 # define FF_SYMVER(type, name, args, ver) \
218 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
219 type ff_##name args; \
224 * Return NULL if a threading library has not been enabled.
225 * Used to disable threading functions in AVCodec definitions
229 # define ONLY_IF_THREADS_ENABLED(x) x
231 # define ONLY_IF_THREADS_ENABLED(x) NULL
237 * this must be called between any dsp function and float/double code.
238 * for example sin(); dsp->idct_put(); emms_c(); cos()
240 static av_always_inline void emms_c(void)
242 if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
243 __asm__ volatile ("emms" ::: "memory");
247 #endif /* HAVE_MMX */
249 #endif /* AVUTIL_INTERNAL_H */