1a54acae7f5446d28da771e7507a362b98ed5538
[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 #ifndef attribute_used
30 #if defined(__GNUC__) && (__GNUC__ > 3 || __GNUC__ == 3 && __GNUC_MINOR__ > 0)
31 # define attribute_used __attribute__((used))
32 #else
33 # define attribute_used
34 #endif
35 #endif
36
37 #ifndef attribute_unused
38 #if defined(__GNUC__)
39 # define attribute_unused __attribute__((unused))
40 #else
41 # define attribute_unused
42 #endif
43 #endif
44
45 #ifndef M_PI
46 #define M_PI 3.14159265358979323846
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 # if INT_MAX != 2147483647
83 # define INT_BIT 64
84 # else
85 # define INT_BIT 32
86 # endif
87 #endif
88
89 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
90 # define PIC
91 #endif
92
93 #include "intreadwrite.h"
94 #include "bswap.h"
95
96 #include <stddef.h>
97 #ifndef offsetof
98 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
99 #endif
100
101 #ifdef __MINGW32__
102 # ifdef _DEBUG
103 # define DEBUG
104 # endif
105
106 # define snprintf _snprintf
107 # define vsnprintf _vsnprintf
108
109 # ifdef CONFIG_WINCE
110 # define perror(a)
111 # define abort()
112 # endif
113
114 /* __MINGW32__ end */
115 #elif defined (CONFIG_OS2)
116 /* OS/2 EMX */
117
118 # include <float.h>
119
120 #endif /* !__MINGW32__ && CONFIG_OS2 */
121
122 #ifdef USE_FASTMEMCPY
123 # include "libvo/fastmemcpy.h"
124 #endif
125
126 // Use rip-relative addressing if compiling PIC code on x86-64.
127 #if defined(__MINGW32__) || defined(__CYGWIN__) || \
128 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
129 # if defined(ARCH_X86_64) && defined(PIC)
130 # define MANGLE(a) "_" #a"(%%rip)"
131 # else
132 # define MANGLE(a) "_" #a
133 # endif
134 #else
135 # if defined(ARCH_X86_64) && defined(PIC)
136 # define MANGLE(a) #a"(%%rip)"
137 # elif defined(CONFIG_DARWIN)
138 # define MANGLE(a) "_" #a
139 # else
140 # define MANGLE(a) #a
141 # endif
142 #endif
143
144 /* debug stuff */
145
146 #if !defined(DEBUG) && !defined(NDEBUG)
147 # define NDEBUG
148 #endif
149 #include <assert.h>
150
151 /* dprintf macros */
152 #ifdef DEBUG
153 # define dprintf(fmt,...) av_log(NULL, AV_LOG_DEBUG, fmt, __VA_ARGS__)
154 #else
155 # define dprintf(fmt,...)
156 #endif
157
158 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
159
160 /* math */
161
162 extern const uint32_t ff_inverse[256];
163
164 #if defined(ARCH_X86)
165 # define FASTDIV(a,b) \
166 ({\
167 int ret,dmy;\
168 asm volatile(\
169 "mull %3"\
170 :"=d"(ret),"=a"(dmy)\
171 :"1"(a),"g"(ff_inverse[b])\
172 );\
173 ret;\
174 })
175 #elif defined(ARCH_ARMV4L)
176 # define FASTDIV(a,b) \
177 ({\
178 int ret,dmy;\
179 asm volatile(\
180 "umull %1, %0, %2, %3"\
181 :"=&r"(ret),"=&r"(dmy)\
182 :"r"(a),"r"(ff_inverse[b])\
183 );\
184 ret;\
185 })
186 #elif defined(CONFIG_FASTDIV)
187 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
188 #else
189 # define FASTDIV(a,b) ((a)/(b))
190 #endif
191
192 extern const uint8_t ff_sqrt_tab[128];
193
194 static inline int ff_sqrt(int a)
195 {
196 int ret=0;
197 int s;
198 int ret_sq=0;
199
200 if(a<128) return ff_sqrt_tab[a];
201
202 for(s=15; s>=0; s--){
203 int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
204 if(b<=a){
205 ret_sq=b;
206 ret+= 1<<s;
207 }
208 }
209 return ret;
210 }
211
212 #if defined(ARCH_X86)
213 #define MASK_ABS(mask, level)\
214 asm volatile(\
215 "cdq \n\t"\
216 "xorl %1, %0 \n\t"\
217 "subl %1, %0 \n\t"\
218 : "+a" (level), "=&d" (mask)\
219 );
220 #else
221 #define MASK_ABS(mask, level)\
222 mask= level>>31;\
223 level= (level^mask)-mask;
224 #endif
225
226 #ifdef HAVE_CMOV
227 #define COPY3_IF_LT(x,y,a,b,c,d)\
228 asm volatile (\
229 "cmpl %0, %3 \n\t"\
230 "cmovl %3, %0 \n\t"\
231 "cmovl %4, %1 \n\t"\
232 "cmovl %5, %2 \n\t"\
233 : "+r" (x), "+r" (a), "+r" (c)\
234 : "r" (y), "r" (b), "r" (d)\
235 );
236 #else
237 #define COPY3_IF_LT(x,y,a,b,c,d)\
238 if((y)<(x)){\
239 (x)=(y);\
240 (a)=(b);\
241 (c)=(d);\
242 }
243 #endif
244
245 /* avoid usage of various functions */
246 #define malloc please_use_av_malloc
247 #define free please_use_av_free
248 #define realloc please_use_av_realloc
249 #define time time_is_forbidden_due_to_security_issues
250 #define rand rand_is_forbidden_due_to_state_trashing
251 #define srand srand_is_forbidden_due_to_state_trashing
252 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
253 #define strcat strcat_is_forbidden_due_to_security_issues_use_pstrcat
254 #if !(defined(LIBAVFORMAT_BUILD) || defined(_FRAMEHOOK_H))
255 #define printf please_use_av_log
256 #define fprintf please_use_av_log
257 #endif
258
259 #define CHECKED_ALLOCZ(p, size)\
260 {\
261 p= av_mallocz(size);\
262 if(p==NULL && (size)!=0){\
263 perror("malloc");\
264 goto fail;\
265 }\
266 }
267
268 #ifndef HAVE_LRINTF
269 /* XXX: add ISOC specific test to avoid specific BSD testing. */
270 /* better than nothing implementation. */
271 /* btw, rintf() is existing on fbsd too -- alex */
272 static av_always_inline long int lrintf(float x)
273 {
274 #ifdef __MINGW32__
275 # ifdef ARCH_X86_32
276 int32_t i;
277 asm volatile(
278 "fistpl %0\n\t"
279 : "=m" (i) : "t" (x) : "st"
280 );
281 return i;
282 # else
283 /* XXX: incorrect, but make it compile */
284 return (int)(x + (x < 0 ? -0.5 : 0.5));
285 # endif /* ARCH_X86_32 */
286 #else
287 return (int)(rint(x));
288 #endif /* __MINGW32__ */
289 }
290 #endif /* HAVE_LRINTF */
291
292 #endif /* INTERNAL_H */