76d3ffacf802437b232d605f145b8d0a39979c26
[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 AVUTIL_INTERNAL_H
27 #define AVUTIL_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 #include "common.h"
37 #include "timer.h"
38
39 #ifndef attribute_align_arg
40 #if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,2)
41 # define attribute_align_arg __attribute__((force_align_arg_pointer))
42 #else
43 # define attribute_align_arg
44 #endif
45 #endif
46
47 #ifndef attribute_used
48 #if AV_GCC_VERSION_AT_LEAST(3,1)
49 # define attribute_used __attribute__((used))
50 #else
51 # define attribute_used
52 #endif
53 #endif
54
55 #ifndef INT16_MIN
56 #define INT16_MIN (-0x7fff-1)
57 #endif
58
59 #ifndef INT16_MAX
60 #define INT16_MAX 0x7fff
61 #endif
62
63 #ifndef INT32_MIN
64 #define INT32_MIN (-0x7fffffff-1)
65 #endif
66
67 #ifndef INT32_MAX
68 #define INT32_MAX 0x7fffffff
69 #endif
70
71 #ifndef UINT32_MAX
72 #define UINT32_MAX 0xffffffff
73 #endif
74
75 #ifndef INT64_MIN
76 #define INT64_MIN (-0x7fffffffffffffffLL-1)
77 #endif
78
79 #ifndef INT64_MAX
80 #define INT64_MAX INT64_C(9223372036854775807)
81 #endif
82
83 #ifndef UINT64_MAX
84 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
85 #endif
86
87 #ifndef INT_BIT
88 # if INT_MAX != 2147483647
89 # define INT_BIT 64
90 # else
91 # define INT_BIT 32
92 # endif
93 #endif
94
95 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
96 # define PIC
97 #endif
98
99 #include "config.h"
100
101 #ifndef offsetof
102 # define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
103 #endif
104
105 // Use rip-relative addressing if compiling PIC code on x86-64.
106 #if ARCH_X86_64 && defined(PIC)
107 # define LOCAL_MANGLE(a) #a "(%%rip)"
108 #else
109 # define LOCAL_MANGLE(a) #a
110 #endif
111
112 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
113
114 /* debug stuff */
115
116 /* dprintf macros */
117 #ifdef DEBUG
118 # define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
119 #else
120 # define dprintf(pctx, ...)
121 #endif
122
123 #define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
124
125 /* math */
126
127 extern const uint32_t ff_inverse[256];
128
129 #if ARCH_X86
130 # define FASTDIV(a,b) \
131 ({\
132 int ret,dmy;\
133 __asm__ volatile(\
134 "mull %3"\
135 :"=d"(ret),"=a"(dmy)\
136 :"1"(a),"g"(ff_inverse[b])\
137 );\
138 ret;\
139 })
140 #elif HAVE_ARMV6
141 static inline av_const int FASTDIV(int a, int b)
142 {
143 int r, t;
144 __asm__ volatile("cmp %3, #2 \n\t"
145 "ldr %1, [%4, %3, lsl #2] \n\t"
146 "lsrle %0, %2, #1 \n\t"
147 "smmulgt %0, %1, %2 \n\t"
148 : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
149 return r;
150 }
151 #elif ARCH_ARM
152 static inline av_const int FASTDIV(int a, int b)
153 {
154 int r, t;
155 __asm__ volatile ("umull %1, %0, %2, %3"
156 : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
157 return r;
158 }
159 #elif CONFIG_FASTDIV
160 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
161 #else
162 # define FASTDIV(a,b) ((a)/(b))
163 #endif
164
165 extern const uint8_t ff_sqrt_tab[256];
166
167 static inline av_const unsigned int ff_sqrt(unsigned int a)
168 {
169 unsigned int b;
170
171 if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
172 else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
173 #if !CONFIG_SMALL
174 else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
175 else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
176 #endif
177 else{
178 int s= av_log2_16bit(a>>16)>>1;
179 unsigned int c= a>>(s+2);
180 b= ff_sqrt_tab[c>>(s+8)];
181 b= FASTDIV(c,b) + (b<<s);
182 }
183
184 return b - (a<b*b);
185 }
186
187 #if ARCH_X86
188 #define MASK_ABS(mask, level)\
189 __asm__ volatile(\
190 "cltd \n\t"\
191 "xorl %1, %0 \n\t"\
192 "subl %1, %0 \n\t"\
193 : "+a" (level), "=&d" (mask)\
194 );
195 #else
196 #define MASK_ABS(mask, level)\
197 mask= level>>31;\
198 level= (level^mask)-mask;
199 #endif
200
201 #if HAVE_CMOV
202 #define COPY3_IF_LT(x,y,a,b,c,d)\
203 __asm__ volatile (\
204 "cmpl %0, %3 \n\t"\
205 "cmovl %3, %0 \n\t"\
206 "cmovl %4, %1 \n\t"\
207 "cmovl %5, %2 \n\t"\
208 : "+&r" (x), "+&r" (a), "+r" (c)\
209 : "r" (y), "r" (b), "r" (d)\
210 );
211 #else
212 #define COPY3_IF_LT(x,y,a,b,c,d)\
213 if((y)<(x)){\
214 (x)=(y);\
215 (a)=(b);\
216 (c)=(d);\
217 }
218 #endif
219
220 /* avoid usage of various functions */
221 #undef malloc
222 #define malloc please_use_av_malloc
223 #undef free
224 #define free please_use_av_free
225 #undef realloc
226 #define realloc please_use_av_realloc
227 #undef time
228 #define time time_is_forbidden_due_to_security_issues
229 #undef rand
230 #define rand rand_is_forbidden_due_to_state_trashing_use_av_random
231 #undef srand
232 #define srand srand_is_forbidden_due_to_state_trashing_use_av_random_init
233 #undef random
234 #define random random_is_forbidden_due_to_state_trashing_use_av_random
235 #undef sprintf
236 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
237 #undef strcat
238 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
239 #undef exit
240 #define exit exit_is_forbidden
241 #ifndef LIBAVFORMAT_BUILD
242 #undef printf
243 #define printf please_use_av_log
244 #undef fprintf
245 #define fprintf please_use_av_log
246 #undef puts
247 #define puts please_use_av_log
248 #undef perror
249 #define perror please_use_av_log_instead_of_perror
250 #endif
251
252 #define CHECKED_ALLOCZ(p, size)\
253 {\
254 p= av_mallocz(size);\
255 if(p==NULL && (size)!=0){\
256 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
257 goto fail;\
258 }\
259 }
260
261 #if defined(__ICC) || defined(__SUNPRO_C)
262 #define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
263 #define DECLARE_ASM_CONST(n,t,v) const t __attribute__ ((aligned (n))) v
264 #elif defined(__GNUC__)
265 #define DECLARE_ALIGNED(n,t,v) t v __attribute__ ((aligned (n)))
266 #define DECLARE_ASM_CONST(n,t,v) static const t v attribute_used __attribute__ ((aligned (n)))
267 #elif HAVE_INLINE_ASM
268 #error The asm code needs alignment, but we do not know how to do it for this compiler.
269 #else
270 #define DECLARE_ALIGNED(n,t,v) t v
271 #define DECLARE_ASM_CONST(n,t,v) static const t v
272 #endif
273
274
275 #if !HAVE_LLRINT
276 static av_always_inline av_const long long llrint(double x)
277 {
278 return rint(x);
279 }
280 #endif /* HAVE_LLRINT */
281
282 #if !HAVE_LRINT
283 static av_always_inline av_const long int lrint(double x)
284 {
285 return rint(x);
286 }
287 #endif /* HAVE_LRINT */
288
289 #if !HAVE_LRINTF
290 static av_always_inline av_const long int lrintf(float x)
291 {
292 return (int)(rint(x));
293 }
294 #endif /* HAVE_LRINTF */
295
296 #if !HAVE_ROUND
297 static av_always_inline av_const double round(double x)
298 {
299 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
300 }
301 #endif /* HAVE_ROUND */
302
303 #if !HAVE_ROUNDF
304 static av_always_inline av_const float roundf(float x)
305 {
306 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
307 }
308 #endif /* HAVE_ROUNDF */
309
310 #if !HAVE_TRUNCF
311 static av_always_inline av_const float truncf(float x)
312 {
313 return (x > 0) ? floor(x) : ceil(x);
314 }
315 #endif /* HAVE_TRUNCF */
316
317 /**
318 * Returns NULL if CONFIG_SMALL is true otherwise the argument
319 * without modifications, used to disable the definition of strings
320 * (for example AVCodec long_names).
321 */
322 #if CONFIG_SMALL
323 # define NULL_IF_CONFIG_SMALL(x) NULL
324 #else
325 # define NULL_IF_CONFIG_SMALL(x) x
326 #endif
327
328 #endif /* AVUTIL_INTERNAL_H */