4de9d58f34e4a957c0314e3e43e312a8fd2b14ce
[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 #include <stdint.h>
30 #include <assert.h>
31
32 #ifndef attribute_used
33 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
34 # define attribute_used __attribute__((used))
35 #else
36 # define attribute_used
37 #endif
38 #endif
39
40 #ifndef M_PI
41 #define M_PI 3.14159265358979323846
42 #endif
43
44 #ifndef INT16_MIN
45 #define INT16_MIN (-0x7fff-1)
46 #endif
47
48 #ifndef INT16_MAX
49 #define INT16_MAX 0x7fff
50 #endif
51
52 #ifndef INT32_MIN
53 #define INT32_MIN (-0x7fffffff-1)
54 #endif
55
56 #ifndef INT32_MAX
57 #define INT32_MAX 0x7fffffff
58 #endif
59
60 #ifndef UINT32_MAX
61 #define UINT32_MAX 0xffffffff
62 #endif
63
64 #ifndef INT64_MIN
65 #define INT64_MIN (-0x7fffffffffffffffLL-1)
66 #endif
67
68 #ifndef INT64_MAX
69 #define INT64_MAX INT64_C(9223372036854775807)
70 #endif
71
72 #ifndef UINT64_MAX
73 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
74 #endif
75
76 #ifndef INT_BIT
77 # if INT_MAX != 2147483647
78 # define INT_BIT 64
79 # else
80 # define INT_BIT 32
81 # endif
82 #endif
83
84 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
85 # define PIC
86 #endif
87
88 #include "intreadwrite.h"
89 #include "bswap.h"
90
91 #include <stddef.h>
92 #ifndef offsetof
93 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
94 #endif
95
96 #ifdef __MINGW32__
97 # ifdef _DEBUG
98 # define DEBUG
99 # endif
100
101 # define snprintf _snprintf
102 # define vsnprintf _vsnprintf
103
104 /* __MINGW32__ end */
105 #elif defined (CONFIG_OS2)
106 /* OS/2 EMX */
107
108 # include <float.h>
109
110 #endif /* !__MINGW32__ && CONFIG_OS2 */
111
112 #ifdef USE_FASTMEMCPY
113 # include "libvo/fastmemcpy.h"
114 # define memcpy(a,b,c) fast_memcpy(a,b,c)
115 #endif
116
117 // Use rip-relative addressing if compiling PIC code on x86-64.
118 #if defined(__MINGW32__) || defined(__CYGWIN__) || \
119 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
120 # if defined(ARCH_X86_64) && defined(PIC)
121 # define MANGLE(a) "_" #a"(%%rip)"
122 # else
123 # define MANGLE(a) "_" #a
124 # endif
125 #else
126 # if defined(ARCH_X86_64) && defined(PIC)
127 # define MANGLE(a) #a"(%%rip)"
128 # elif defined(CONFIG_DARWIN)
129 # define MANGLE(a) "_" #a
130 # else
131 # define MANGLE(a) #a
132 # endif
133 #endif
134
135 /* debug stuff */
136
137 #if !defined(DEBUG) && !defined(NDEBUG)
138 # define NDEBUG
139 #endif
140 #include <assert.h>
141
142 /* dprintf macros */
143 #ifdef DEBUG
144 # define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
145 #else
146 # define dprintf(pctx, ...)
147 #endif
148
149 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
150
151 /* math */
152
153 extern const uint32_t ff_inverse[256];
154
155 #if defined(ARCH_X86)
156 # define FASTDIV(a,b) \
157 ({\
158 int ret,dmy;\
159 asm volatile(\
160 "mull %3"\
161 :"=d"(ret),"=a"(dmy)\
162 :"1"(a),"g"(ff_inverse[b])\
163 );\
164 ret;\
165 })
166 #elif defined(ARCH_ARMV4L)
167 # define FASTDIV(a,b) \
168 ({\
169 int ret,dmy;\
170 asm volatile(\
171 "umull %1, %0, %2, %3"\
172 :"=&r"(ret),"=&r"(dmy)\
173 :"r"(a),"r"(ff_inverse[b])\
174 );\
175 ret;\
176 })
177 #elif defined(CONFIG_FASTDIV)
178 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
179 #else
180 # define FASTDIV(a,b) ((a)/(b))
181 #endif
182
183 extern const uint8_t ff_sqrt_tab[128];
184
185 static inline int ff_sqrt(int a)
186 {
187 int ret=0;
188 int s, b;
189
190 if(a<128) return ff_sqrt_tab[a];
191
192 for(s=30; s>=0; s-=2){
193 ret+=ret;
194 b= (1+2*ret)<<s;
195 if(b<=a){
196 a-=b;
197 ret++;
198 }
199 }
200 return ret;
201 }
202
203 #if defined(ARCH_X86)
204 #define MASK_ABS(mask, level)\
205 asm volatile(\
206 "cdq \n\t"\
207 "xorl %1, %0 \n\t"\
208 "subl %1, %0 \n\t"\
209 : "+a" (level), "=&d" (mask)\
210 );
211 #else
212 #define MASK_ABS(mask, level)\
213 mask= level>>31;\
214 level= (level^mask)-mask;
215 #endif
216
217 #ifdef HAVE_CMOV
218 #define COPY3_IF_LT(x,y,a,b,c,d)\
219 asm volatile (\
220 "cmpl %0, %3 \n\t"\
221 "cmovl %3, %0 \n\t"\
222 "cmovl %4, %1 \n\t"\
223 "cmovl %5, %2 \n\t"\
224 : "+&r" (x), "+&r" (a), "+r" (c)\
225 : "r" (y), "r" (b), "r" (d)\
226 );
227 #else
228 #define COPY3_IF_LT(x,y,a,b,c,d)\
229 if((y)<(x)){\
230 (x)=(y);\
231 (a)=(b);\
232 (c)=(d);\
233 }
234 #endif
235
236 /* avoid usage of various functions */
237 #define malloc please_use_av_malloc
238 #define free please_use_av_free
239 #define realloc please_use_av_realloc
240 #define time time_is_forbidden_due_to_security_issues
241 #define rand rand_is_forbidden_due_to_state_trashing
242 #define srand srand_is_forbidden_due_to_state_trashing
243 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
244 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
245 #define exit exit_is_forbidden
246 #if !(defined(LIBAVFORMAT_BUILD) || defined(FRAMEHOOK_H))
247 #define printf please_use_av_log
248 #define fprintf please_use_av_log
249 #endif
250
251 #define CHECKED_ALLOCZ(p, size)\
252 {\
253 p= av_mallocz(size);\
254 if(p==NULL && (size)!=0){\
255 perror("malloc");\
256 goto fail;\
257 }\
258 }
259
260 #ifndef HAVE_LRINTF
261 /* XXX: add ISOC specific test to avoid specific BSD testing. */
262 /* better than nothing implementation. */
263 /* btw, rintf() is existing on fbsd too -- alex */
264 static av_always_inline long int lrintf(float x)
265 {
266 #ifdef __MINGW32__
267 # ifdef ARCH_X86_32
268 int32_t i;
269 asm volatile(
270 "fistpl %0\n\t"
271 : "=m" (i) : "t" (x) : "st"
272 );
273 return i;
274 # else
275 /* XXX: incorrect, but make it compile */
276 return (int)(x + (x < 0 ? -0.5 : 0.5));
277 # endif /* ARCH_X86_32 */
278 #else
279 return (int)(rint(x));
280 #endif /* __MINGW32__ */
281 }
282 #endif /* HAVE_LRINTF */
283
284 #endif /* INTERNAL_H */