internal.h
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1 /*
2  * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3  *
4  * This file is part of Libav.
5  *
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.
10  *
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.
15  *
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
19  */
20 
26 #ifndef AVUTIL_INTERNAL_H
27 #define AVUTIL_INTERNAL_H
28 
29 #if !defined(DEBUG) && !defined(NDEBUG)
30 # define NDEBUG
31 #endif
32 
33 #include <limits.h>
34 #include <stdint.h>
35 #include <stddef.h>
36 #include <assert.h>
37 #include "config.h"
38 #include "attributes.h"
39 #include "timer.h"
40 #include "dict.h"
41 
42 #ifndef attribute_align_arg
43 #if ARCH_X86_32 && AV_GCC_VERSION_AT_LEAST(4,2)
44 # define attribute_align_arg __attribute__((force_align_arg_pointer))
45 #else
46 # define attribute_align_arg
47 #endif
48 #endif
49 
50 #if defined(_MSC_VER) && CONFIG_SHARED
51 # define av_export __declspec(dllimport)
52 #else
53 # define av_export
54 #endif
55 
56 #ifndef INT_BIT
57 # define INT_BIT (CHAR_BIT * sizeof(int))
58 #endif
59 
60 #define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
61 {\
62  p = av_malloc(size);\
63  if (p == NULL && (size) != 0) {\
64  av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
65  goto label;\
66  }\
67 }
68 
69 #define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
70 {\
71  p = av_mallocz(size);\
72  if (p == NULL && (size) != 0) {\
73  av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
74  goto label;\
75  }\
76 }
77 
78 #include "libm.h"
79 
85 #if CONFIG_SMALL
86 # define NULL_IF_CONFIG_SMALL(x) NULL
87 #else
88 # define NULL_IF_CONFIG_SMALL(x) x
89 #endif
90 
91 
109 #if HAVE_SYMVER_ASM_LABEL
110 # define FF_SYMVER(type, name, args, ver) \
111  type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver); \
112  type ff_##name args
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; \
117  type ff_##name args
118 #endif
119 
125 #if HAVE_THREADS
126 # define ONLY_IF_THREADS_ENABLED(x) x
127 #else
128 # define ONLY_IF_THREADS_ENABLED(x) NULL
129 #endif
130 
131 #if HAVE_MMX_INLINE
132 
137 static av_always_inline void emms_c(void)
138 {
139  __asm__ volatile ("emms" ::: "memory");
140 }
141 #elif HAVE_MMX && HAVE_MM_EMPTY
142 # include <mmintrin.h>
143 # define emms_c _mm_empty
144 #else
145 # define emms_c()
146 #endif /* HAVE_MMX_INLINE */
147 
148 #endif /* AVUTIL_INTERNAL_H */