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
51 #if defined(_MSC_VER) && CONFIG_SHARED
52 # define av_export __declspec(dllimport)
58 # define INT_BIT (CHAR_BIT * sizeof(int))
61 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
64 if (p == NULL && (size) != 0) {\
65 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
70 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
72 p = av_mallocz(size);\
73 if (p == NULL && (size) != 0) {\
74 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
82 * Return NULL if CONFIG_SMALL is true, otherwise the argument
83 * without modification. Used to disable the definition of strings
84 * (for example AVCodec long_names).
87 # define NULL_IF_CONFIG_SMALL(x) NULL
89 # define NULL_IF_CONFIG_SMALL(x) x
93 * Define a function with only the non-default version specified.
95 * On systems with ELF shared libraries, all symbols exported from
96 * FFmpeg libraries are tagged with the name and major version of the
97 * library to which they belong. If a function is moved from one
98 * library to another, a wrapper must be retained in the original
99 * location to preserve binary compatibility.
101 * Functions defined with this macro will never be used to resolve
102 * symbols by the build-time linker.
104 * @param type return type of function
105 * @param name name of function
106 * @param args argument list of function
107 * @param ver version tag to assign function
109 #if HAVE_SYMVER_ASM_LABEL
110 # define FF_SYMVER(type, name, args, ver) \
111 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
113 #elif HAVE_SYMVER_GNU_ASM
114 # define FF_SYMVER(type, name, args, ver) \
115 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
116 type ff_##name args; \
121 * Return NULL if a threading library has not been enabled.
122 * Used to disable threading functions in AVCodec definitions
126 # define ONLY_IF_THREADS_ENABLED(x) x
128 # define ONLY_IF_THREADS_ENABLED(x) NULL
134 * this must be called between any dsp function and float/double code.
135 * for example sin(); dsp->idct_put(); emms_c(); cos()
137 static av_always_inline void emms_c(void)
139 if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
140 __asm__ volatile ("emms" ::: "memory");
142 #elif HAVE_MMX && HAVE_MM_EMPTY
143 # include <mmintrin.h>
144 # define emms_c _mm_empty
147 #endif /* HAVE_MMX_INLINE */
149 #endif /* AVUTIL_INTERNAL_H */