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