Statistics
| Branch: | Revision:

ffmpeg / libavutil / internal.h @ a5b13b14

History | View | Annotate | Download (6 KB)

1
/*
2
 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3
 *
4
 * This file is part of FFmpeg.
5
 *
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.
10
 *
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.
15
 *
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
19
 */
20

    
21
/**
22
 * @file
23
 * common internal API header
24
 */
25

    
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

    
41
#ifndef attribute_align_arg
42
#if ARCH_X86_32 && (!defined(__INTEL_COMPILER) || __INTEL_COMPILER > 1200) && AV_GCC_VERSION_AT_LEAST(4,2)
43
#    define attribute_align_arg __attribute__((force_align_arg_pointer))
44
#else
45
#    define attribute_align_arg
46
#endif
47
#endif
48

    
49
#ifndef INT16_MIN
50
#define INT16_MIN       (-0x7fff - 1)
51
#endif
52

    
53
#ifndef INT16_MAX
54
#define INT16_MAX       0x7fff
55
#endif
56

    
57
#ifndef INT32_MIN
58
#define INT32_MIN       (-0x7fffffff - 1)
59
#endif
60

    
61
#ifndef INT32_MAX
62
#define INT32_MAX       0x7fffffff
63
#endif
64

    
65
#ifndef UINT32_MAX
66
#define UINT32_MAX      0xffffffff
67
#endif
68

    
69
#ifndef INT64_MIN
70
#define INT64_MIN       (-0x7fffffffffffffffLL - 1)
71
#endif
72

    
73
#ifndef INT64_MAX
74
#define INT64_MAX INT64_C(9223372036854775807)
75
#endif
76

    
77
#ifndef UINT64_MAX
78
#define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
79
#endif
80

    
81
#ifndef INT_BIT
82
#    define INT_BIT (CHAR_BIT * sizeof(int))
83
#endif
84

    
85
#ifndef offsetof
86
#    define offsetof(T, F) ((unsigned int)((char *)&((T *)0)->F))
87
#endif
88

    
89
/* Use to export labels from asm. */
90
#define LABEL_MANGLE(a) EXTERN_PREFIX #a
91

    
92
// Use rip-relative addressing if compiling PIC code on x86-64.
93
#if ARCH_X86_64 && defined(PIC)
94
#    define LOCAL_MANGLE(a) #a "(%%rip)"
95
#else
96
#    define LOCAL_MANGLE(a) #a
97
#endif
98

    
99
#define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
100

    
101
/* debug stuff */
102

    
103
#define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
104

    
105
/* math */
106

    
107
#if ARCH_X86
108
#define MASK_ABS(mask, level)\
109
            __asm__ volatile(\
110
                "cltd                   \n\t"\
111
                "xorl %1, %0            \n\t"\
112
                "subl %1, %0            \n\t"\
113
                : "+a" (level), "=&d" (mask)\
114
            );
115
#else
116
#define MASK_ABS(mask, level)\
117
            mask  = level >> 31;\
118
            level = (level ^ mask) - mask;
119
#endif
120

    
121
/* avoid usage of dangerous/inappropriate system functions */
122
#undef  malloc
123
#define malloc please_use_av_malloc
124
#undef  free
125
#define free please_use_av_free
126
#undef  realloc
127
#define realloc please_use_av_realloc
128
#undef  time
129
#define time time_is_forbidden_due_to_security_issues
130
#undef  rand
131
#define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
132
#undef  srand
133
#define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
134
#undef  random
135
#define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
136
#undef  sprintf
137
#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
138
#undef  strcat
139
#define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
140
#undef  exit
141
#define exit exit_is_forbidden
142
#ifndef LIBAVFORMAT_BUILD
143
#undef  printf
144
#define printf please_use_av_log_instead_of_printf
145
#undef  fprintf
146
#define fprintf please_use_av_log_instead_of_fprintf
147
#undef  puts
148
#define puts please_use_av_log_instead_of_puts
149
#undef  perror
150
#define perror please_use_av_log_instead_of_perror
151
#endif
152

    
153
#define FF_ALLOC_OR_GOTO(ctx, p, size, label)\
154
{\
155
    p = av_malloc(size);\
156
    if (p == NULL && (size) != 0) {\
157
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
158
        goto label;\
159
    }\
160
}
161

    
162
#define FF_ALLOCZ_OR_GOTO(ctx, p, size, label)\
163
{\
164
    p = av_mallocz(size);\
165
    if (p == NULL && (size) != 0) {\
166
        av_log(ctx, AV_LOG_ERROR, "Cannot allocate memory.\n");\
167
        goto label;\
168
    }\
169
}
170

    
171
#include "libm.h"
172

    
173
/**
174
 * Return NULL if CONFIG_SMALL is true, otherwise the argument
175
 * without modification. Used to disable the definition of strings
176
 * (for example AVCodec long_names).
177
 */
178
#if CONFIG_SMALL
179
#   define NULL_IF_CONFIG_SMALL(x) NULL
180
#else
181
#   define NULL_IF_CONFIG_SMALL(x) x
182
#endif
183

    
184

    
185
/**
186
 * Define a function with only the non-default version specified.
187
 *
188
 * On systems with ELF shared libraries, all symbols exported from
189
 * FFmpeg libraries are tagged with the name and major version of the
190
 * library to which they belong.  If a function is moved from one
191
 * library to another, a wrapper must be retained in the original
192
 * location to preserve binary compatibility.
193
 *
194
 * Functions defined with this macro will never be used to resolve
195
 * symbols by the build-time linker.
196
 *
197
 * @param type return type of function
198
 * @param name name of function
199
 * @param args argument list of function
200
 * @param ver  version tag to assign function
201
 */
202
#if HAVE_SYMVER_ASM_LABEL
203
#   define FF_SYMVER(type, name, args, ver)                     \
204
    type ff_##name args __asm__ (EXTERN_PREFIX #name "@" ver);  \
205
    type ff_##name args
206
#elif HAVE_SYMVER_GNU_ASM
207
#   define FF_SYMVER(type, name, args, ver)                             \
208
    __asm__ (".symver ff_" #name "," EXTERN_PREFIX #name "@" ver);      \
209
    type ff_##name args;                                                \
210
    type ff_##name args
211
#endif
212

    
213
/**
214
 * Returns NULL if a threading library has not been enabled.
215
 * Used to disable threading functions in AVCodec definitions
216
 * when not needed.
217
 */
218
#if HAVE_THREADS
219
#   define ONLY_IF_THREADS_ENABLED(x) x
220
#else
221
#   define ONLY_IF_THREADS_ENABLED(x) NULL
222
#endif
223

    
224
#endif /* AVUTIL_INTERNAL_H */