c4c151d8f720d205a22a84638a2711060eeeffbc
[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 FFMPEG_INTERNAL_H
27 #define FFMPEG_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 /* Use Apple-specific AltiVec syntax for vector declarations when necessary. */
54 #ifdef __APPLE_CC__
55 #define AVV(x...) (x)
56 #else
57 #define AVV(x...) {x}
58 #endif
59
60 #ifndef M_PI
61 #define M_PI 3.14159265358979323846
62 #endif
63
64 #ifndef INT16_MIN
65 #define INT16_MIN (-0x7fff-1)
66 #endif
67
68 #ifndef INT16_MAX
69 #define INT16_MAX 0x7fff
70 #endif
71
72 #ifndef INT32_MIN
73 #define INT32_MIN (-0x7fffffff-1)
74 #endif
75
76 #ifndef INT32_MAX
77 #define INT32_MAX 0x7fffffff
78 #endif
79
80 #ifndef UINT32_MAX
81 #define UINT32_MAX 0xffffffff
82 #endif
83
84 #ifndef INT64_MIN
85 #define INT64_MIN (-0x7fffffffffffffffLL-1)
86 #endif
87
88 #ifndef INT64_MAX
89 #define INT64_MAX INT64_C(9223372036854775807)
90 #endif
91
92 #ifndef UINT64_MAX
93 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
94 #endif
95
96 #ifndef INT_BIT
97 # if INT_MAX != 2147483647
98 # define INT_BIT 64
99 # else
100 # define INT_BIT 32
101 # endif
102 #endif
103
104 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
105 # define PIC
106 #endif
107
108 #include "intreadwrite.h"
109 #include "bswap.h"
110
111 #ifndef offsetof
112 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
113 #endif
114
115 #ifdef USE_FASTMEMCPY
116 # include "libvo/fastmemcpy.h"
117 # define memcpy(a,b,c) fast_memcpy(a,b,c)
118 #endif
119
120 // Use rip-relative addressing if compiling PIC code on x86-64.
121 #if defined(__MINGW32__) || defined(__CYGWIN__) || defined(__DJGPP__) || \
122 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
123 # if defined(ARCH_X86_64) && defined(PIC)
124 # define MANGLE(a) "_" #a"(%%rip)"
125 # else
126 # define MANGLE(a) "_" #a
127 # endif
128 #else
129 # if defined(ARCH_X86_64) && defined(PIC)
130 # define MANGLE(a) #a"(%%rip)"
131 # elif defined(__APPLE__)
132 # define MANGLE(a) "_" #a
133 # else
134 # define MANGLE(a) #a
135 # endif
136 #endif
137
138 /* debug stuff */
139
140 /* dprintf macros */
141 #ifdef DEBUG
142 # define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
143 #else
144 # define dprintf(pctx, ...)
145 #endif
146
147 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
148
149 /* math */
150
151 extern const uint32_t ff_inverse[256];
152
153 #if defined(ARCH_X86)
154 # define FASTDIV(a,b) \
155 ({\
156 int ret,dmy;\
157 asm volatile(\
158 "mull %3"\
159 :"=d"(ret),"=a"(dmy)\
160 :"1"(a),"g"(ff_inverse[b])\
161 );\
162 ret;\
163 })
164 #elif defined(ARCH_ARMV4L)
165 # define FASTDIV(a,b) \
166 ({\
167 int ret,dmy;\
168 asm volatile(\
169 "umull %1, %0, %2, %3"\
170 :"=&r"(ret),"=&r"(dmy)\
171 :"r"(a),"r"(ff_inverse[b])\
172 );\
173 ret;\
174 })
175 #elif defined(CONFIG_FASTDIV)
176 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
177 #else
178 # define FASTDIV(a,b) ((a)/(b))
179 #endif
180
181 extern const uint8_t ff_sqrt_tab[256];
182
183 static inline int av_log2_16bit(unsigned int v);
184
185 static inline unsigned int ff_sqrt(unsigned int a)
186 {
187 unsigned int b;
188
189 if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
190 else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
191 #ifndef CONFIG_SMALL
192 else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
193 else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
194 #endif
195 else{
196 int s= av_log2_16bit(a>>16)>>1;
197 unsigned int c= a>>(s+2);
198 b= ff_sqrt_tab[c>>(s+8)];
199 b= FASTDIV(c,b) + (b<<s);
200 }
201
202 return b - (a<b*b);
203 }
204
205 #if defined(ARCH_X86)
206 #define MASK_ABS(mask, level)\
207 asm volatile(\
208 "cdq \n\t"\
209 "xorl %1, %0 \n\t"\
210 "subl %1, %0 \n\t"\
211 : "+a" (level), "=&d" (mask)\
212 );
213 #else
214 #define MASK_ABS(mask, level)\
215 mask= level>>31;\
216 level= (level^mask)-mask;
217 #endif
218
219 #ifdef HAVE_CMOV
220 #define COPY3_IF_LT(x,y,a,b,c,d)\
221 asm volatile (\
222 "cmpl %0, %3 \n\t"\
223 "cmovl %3, %0 \n\t"\
224 "cmovl %4, %1 \n\t"\
225 "cmovl %5, %2 \n\t"\
226 : "+&r" (x), "+&r" (a), "+r" (c)\
227 : "r" (y), "r" (b), "r" (d)\
228 );
229 #else
230 #define COPY3_IF_LT(x,y,a,b,c,d)\
231 if((y)<(x)){\
232 (x)=(y);\
233 (a)=(b);\
234 (c)=(d);\
235 }
236 #endif
237
238 /* avoid usage of various functions */
239 #undef malloc
240 #define malloc please_use_av_malloc
241 #undef free
242 #define free please_use_av_free
243 #undef realloc
244 #define realloc please_use_av_realloc
245 #undef time
246 #define time time_is_forbidden_due_to_security_issues
247 #undef rand
248 #define rand rand_is_forbidden_due_to_state_trashing_use_av_random
249 #undef srand
250 #define srand srand_is_forbidden_due_to_state_trashing_use_av_init_random
251 #undef random
252 #define random random_is_forbidden_due_to_state_trashing_use_av_random
253 #undef sprintf
254 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
255 #undef strcat
256 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
257 #undef exit
258 #define exit exit_is_forbidden
259 #if !(defined(LIBAVFORMAT_BUILD) || defined(FFMPEG_FRAMEHOOK_H))
260 #undef printf
261 #define printf please_use_av_log
262 #undef fprintf
263 #define fprintf please_use_av_log
264 #undef puts
265 #define puts please_use_av_log
266 #undef perror
267 #define perror please_use_av_log_instead_of_perror
268 #endif
269
270 #define CHECKED_ALLOCZ(p, size)\
271 {\
272 p= av_mallocz(size);\
273 if(p==NULL && (size)!=0){\
274 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
275 goto fail;\
276 }\
277 }
278
279 #ifndef HAVE_LLRINT
280 static av_always_inline long long llrint(double x)
281 {
282 return rint(x);
283 }
284 #endif /* HAVE_LLRINT */
285
286 #ifndef HAVE_LRINT
287 static av_always_inline long int lrint(double x)
288 {
289 return rint(x);
290 }
291 #endif /* HAVE_LRINT */
292
293 #ifndef HAVE_LRINTF
294 static av_always_inline long int lrintf(float x)
295 {
296 return (int)(rint(x));
297 }
298 #endif /* HAVE_LRINTF */
299
300 #ifndef HAVE_ROUND
301 static av_always_inline double round(double x)
302 {
303 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
304 }
305 #endif /* HAVE_ROUND */
306
307 #ifndef HAVE_ROUNDF
308 static av_always_inline float roundf(float x)
309 {
310 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
311 }
312 #endif /* HAVE_ROUNDF */
313
314 #endif /* FFMPEG_INTERNAL_H */