58c5aa86968f98c89dcf2e613096a9ecdd3ba0d2
[libav.git] / libavutil / internal.h
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 internal.h
23 * common internal api header.
24 */
25
26 #ifndef INTERNAL_H
27 #define INTERNAL_H
28
29 #if !defined(DEBUG) && !defined(NDEBUG)
30 # define NDEBUG
31 #endif
32
33 #include <stdint.h>
34 #include <stddef.h>
35 #include <assert.h>
36
37 #ifndef attribute_align_arg
38 #if defined(__GNUC__) && (__GNUC__ > 4 || __GNUC__ == 4 && __GNUC_MINOR__>1)
39 # define attribute_align_arg __attribute__((force_align_arg_pointer))
40 #else
41 # define attribute_align_arg
42 #endif
43 #endif
44
45 #ifndef attribute_used
46 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
47 # define attribute_used __attribute__((used))
48 #else
49 # define attribute_used
50 #endif
51 #endif
52
53 #ifndef M_PI
54 #define M_PI 3.14159265358979323846
55 #endif
56
57 #ifndef INT16_MIN
58 #define INT16_MIN (-0x7fff-1)
59 #endif
60
61 #ifndef INT16_MAX
62 #define INT16_MAX 0x7fff
63 #endif
64
65 #ifndef INT32_MIN
66 #define INT32_MIN (-0x7fffffff-1)
67 #endif
68
69 #ifndef INT32_MAX
70 #define INT32_MAX 0x7fffffff
71 #endif
72
73 #ifndef UINT32_MAX
74 #define UINT32_MAX 0xffffffff
75 #endif
76
77 #ifndef INT64_MIN
78 #define INT64_MIN (-0x7fffffffffffffffLL-1)
79 #endif
80
81 #ifndef INT64_MAX
82 #define INT64_MAX INT64_C(9223372036854775807)
83 #endif
84
85 #ifndef UINT64_MAX
86 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
87 #endif
88
89 #ifndef INT_BIT
90 # if INT_MAX != 2147483647
91 # define INT_BIT 64
92 # else
93 # define INT_BIT 32
94 # endif
95 #endif
96
97 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
98 # define PIC
99 #endif
100
101 #include "intreadwrite.h"
102 #include "bswap.h"
103
104 #ifndef offsetof
105 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
106 #endif
107
108 #ifdef USE_FASTMEMCPY
109 # include "libvo/fastmemcpy.h"
110 # define memcpy(a,b,c) fast_memcpy(a,b,c)
111 #endif
112
113 // Use rip-relative addressing if compiling PIC code on x86-64.
114 #if defined(__MINGW32__) || defined(__CYGWIN__) || \
115 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
116 # if defined(ARCH_X86_64) && defined(PIC)
117 # define MANGLE(a) "_" #a"(%%rip)"
118 # else
119 # define MANGLE(a) "_" #a
120 # endif
121 #else
122 # if defined(ARCH_X86_64) && defined(PIC)
123 # define MANGLE(a) #a"(%%rip)"
124 # elif defined(SYS_DARWIN)
125 # define MANGLE(a) "_" #a
126 # else
127 # define MANGLE(a) #a
128 # endif
129 #endif
130
131 /* debug stuff */
132
133 /* dprintf macros */
134 #ifdef DEBUG
135 # define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
136 #else
137 # define dprintf(pctx, ...)
138 #endif
139
140 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
141
142 /* math */
143
144 extern const uint32_t ff_inverse[256];
145
146 #if defined(ARCH_X86)
147 # define FASTDIV(a,b) \
148 ({\
149 int ret,dmy;\
150 asm volatile(\
151 "mull %3"\
152 :"=d"(ret),"=a"(dmy)\
153 :"1"(a),"g"(ff_inverse[b])\
154 );\
155 ret;\
156 })
157 #elif defined(ARCH_ARMV4L)
158 # define FASTDIV(a,b) \
159 ({\
160 int ret,dmy;\
161 asm volatile(\
162 "umull %1, %0, %2, %3"\
163 :"=&r"(ret),"=&r"(dmy)\
164 :"r"(a),"r"(ff_inverse[b])\
165 );\
166 ret;\
167 })
168 #elif defined(CONFIG_FASTDIV)
169 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
170 #else
171 # define FASTDIV(a,b) ((a)/(b))
172 #endif
173
174 extern const uint8_t ff_sqrt_tab[128];
175
176 static inline int ff_sqrt(int a)
177 {
178 int ret=0;
179 int s, b;
180
181 if(a<128) return ff_sqrt_tab[a];
182
183 for(s=30; s>=0; s-=2){
184 ret+=ret;
185 b= (1+2*ret)<<s;
186 if(b<=a){
187 a-=b;
188 ret++;
189 }
190 }
191 return ret;
192 }
193
194 #if defined(ARCH_X86)
195 #define MASK_ABS(mask, level)\
196 asm volatile(\
197 "cdq \n\t"\
198 "xorl %1, %0 \n\t"\
199 "subl %1, %0 \n\t"\
200 : "+a" (level), "=&d" (mask)\
201 );
202 #else
203 #define MASK_ABS(mask, level)\
204 mask= level>>31;\
205 level= (level^mask)-mask;
206 #endif
207
208 #ifdef HAVE_CMOV
209 #define COPY3_IF_LT(x,y,a,b,c,d)\
210 asm volatile (\
211 "cmpl %0, %3 \n\t"\
212 "cmovl %3, %0 \n\t"\
213 "cmovl %4, %1 \n\t"\
214 "cmovl %5, %2 \n\t"\
215 : "+&r" (x), "+&r" (a), "+r" (c)\
216 : "r" (y), "r" (b), "r" (d)\
217 );
218 #else
219 #define COPY3_IF_LT(x,y,a,b,c,d)\
220 if((y)<(x)){\
221 (x)=(y);\
222 (a)=(b);\
223 (c)=(d);\
224 }
225 #endif
226
227 /* avoid usage of various functions */
228 #undef malloc
229 #define malloc please_use_av_malloc
230 #undef free
231 #define free please_use_av_free
232 #undef realloc
233 #define realloc please_use_av_realloc
234 #undef time
235 #define time time_is_forbidden_due_to_security_issues
236 #undef rand
237 #define rand rand_is_forbidden_due_to_state_trashing_use_av_random
238 #undef srand
239 #define srand srand_is_forbidden_due_to_state_trashing_use_av_init_random
240 #undef random
241 #define random random_is_forbidden_due_to_state_trashing_use_av_random
242 #undef sprintf
243 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
244 #undef strcat
245 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
246 #undef exit
247 #define exit exit_is_forbidden
248 #if !(defined(LIBAVFORMAT_BUILD) || defined(FRAMEHOOK_H))
249 #undef printf
250 #define printf please_use_av_log
251 #undef fprintf
252 #define fprintf please_use_av_log
253 #endif
254
255 #define CHECKED_ALLOCZ(p, size)\
256 {\
257 p= av_mallocz(size);\
258 if(p==NULL && (size)!=0){\
259 perror("malloc");\
260 goto fail;\
261 }\
262 }
263
264 #ifndef HAVE_LRINTF
265 /* XXX: add ISOC specific test to avoid specific BSD testing. */
266 /* better than nothing implementation. */
267 /* btw, rintf() is existing on fbsd too -- alex */
268 static av_always_inline long int lrintf(float x)
269 {
270 return (int)(rint(x));
271 }
272 #endif /* HAVE_LRINTF */
273
274 #endif /* INTERNAL_H */