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 // Some broken preprocessors need a second expansion
62 // to be forced to tokenize __VA_ARGS__
65 #define LOCAL_ALIGNED_A(a, t, v, s, o, ...) \
66 uint8_t la_##v[sizeof(t s o) + (a)]; \
67 t (*v) o = (void *)FFALIGN((uintptr_t)la_##v, a)
69 #define LOCAL_ALIGNED_D(a, t, v, s, o, ...) \
70 DECLARE_ALIGNED(a, t, la_##v) s o; \
73 #define LOCAL_ALIGNED(a, t, v, ...) E1(LOCAL_ALIGNED_A(a, t, v, __VA_ARGS__,,))
75 #if HAVE_LOCAL_ALIGNED_8
76 # define LOCAL_ALIGNED_8(t, v, ...) E1(LOCAL_ALIGNED_D(8, t, v, __VA_ARGS__,,))
78 # define LOCAL_ALIGNED_8(t, v, ...) LOCAL_ALIGNED(8, t, v, __VA_ARGS__)
81 #if HAVE_LOCAL_ALIGNED_16
82 # define LOCAL_ALIGNED_16(t, v, ...) E1(LOCAL_ALIGNED_D(16, t, v, __VA_ARGS__,,))
84 # define LOCAL_ALIGNED_16(t, v, ...) LOCAL_ALIGNED(16, t, v, __VA_ARGS__)
87 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
90 if (p == NULL && (size) != 0) {\
91 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
96 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
98 p = av_mallocz(size);\
99 if (p == NULL && (size) != 0) {\
100 av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
108 * Return NULL if CONFIG_SMALL is true, otherwise the argument
109 * without modification. Used to disable the definition of strings
110 * (for example AVCodec long_names).
113 # define NULL_IF_CONFIG_SMALL(x) NULL
115 # define NULL_IF_CONFIG_SMALL(x) x
119 * Define a function with only the non-default version specified.
121 * On systems with ELF shared libraries, all symbols exported from
122 * FFmpeg libraries are tagged with the name and major version of the
123 * library to which they belong. If a function is moved from one
124 * library to another, a wrapper must be retained in the original
125 * location to preserve binary compatibility.
127 * Functions defined with this macro will never be used to resolve
128 * symbols by the build-time linker.
130 * @param type return type of function
131 * @param name name of function
132 * @param args argument list of function
133 * @param ver version tag to assign function
135 #if HAVE_SYMVER_ASM_LABEL
136 # define FF_SYMVER(type, name, args, ver) \
137 type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
139 #elif HAVE_SYMVER_GNU_ASM
140 # define FF_SYMVER(type, name, args, ver) \
141 __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver); \
142 type ff_##name args; \
147 * Return NULL if a threading library has not been enabled.
148 * Used to disable threading functions in AVCodec definitions
152 # define ONLY_IF_THREADS_ENABLED(x) x
154 # define ONLY_IF_THREADS_ENABLED(x) NULL
160 * this must be called between any dsp function and float/double code.
161 * for example sin(); dsp->idct_put(); emms_c(); cos()
163 static av_always_inline void emms_c(void)
165 if(av_get_cpu_flags() & AV_CPU_FLAG_MMX)
166 __asm__ volatile ("emms" ::: "memory");
168 #elif HAVE_MMX && HAVE_MM_EMPTY
169 # include <mmintrin.h>
170 # define emms_c _mm_empty
171 #elif HAVE_MMX && HAVE_YASM
172 # include "libavutil/x86/emms.h"
173 # define emms_c avpriv_emms_yasm
176 #endif /* HAVE_MMX_INLINE */
178 #endif /* AVUTIL_INTERNAL_H */