798c55b87aa0ad45dfb755bc0d3af762a53410b9
[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 #ifndef INT16_MIN
54 #define INT16_MIN (-0x7fff-1)
55 #endif
56
57 #ifndef INT16_MAX
58 #define INT16_MAX 0x7fff
59 #endif
60
61 #ifndef INT32_MIN
62 #define INT32_MIN (-0x7fffffff-1)
63 #endif
64
65 #ifndef INT32_MAX
66 #define INT32_MAX 0x7fffffff
67 #endif
68
69 #ifndef UINT32_MAX
70 #define UINT32_MAX 0xffffffff
71 #endif
72
73 #ifndef INT64_MIN
74 #define INT64_MIN (-0x7fffffffffffffffLL-1)
75 #endif
76
77 #ifndef INT64_MAX
78 #define INT64_MAX INT64_C(9223372036854775807)
79 #endif
80
81 #ifndef UINT64_MAX
82 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
83 #endif
84
85 #ifndef INT_BIT
86 # if INT_MAX != 2147483647
87 # define INT_BIT 64
88 # else
89 # define INT_BIT 32
90 # endif
91 #endif
92
93 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
94 # define PIC
95 #endif
96
97 #include "config.h"
98 #include "intreadwrite.h"
99 #include "bswap.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 defined(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 defined(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 defined(HAVE_ARMV6)
141 static inline av_const int FASTDIV(int a, int b)
142 {
143 int r;
144 asm volatile("cmp %2, #0 \n\t"
145 "smmul %0, %1, %2 \n\t"
146 "rsblt %0, %0, #0 \n\t"
147 : "=r"(r) : "r"(a), "r"(ff_inverse[b]));
148 return r;
149 }
150 #elif defined(ARCH_ARMV4L)
151 # define FASTDIV(a,b) \
152 ({\
153 int ret,dmy;\
154 asm volatile(\
155 "umull %1, %0, %2, %3"\
156 :"=&r"(ret),"=&r"(dmy)\
157 :"r"(a),"r"(ff_inverse[b])\
158 );\
159 ret;\
160 })
161 #elif defined(CONFIG_FASTDIV)
162 # define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
163 #else
164 # define FASTDIV(a,b) ((a)/(b))
165 #endif
166
167 extern const uint8_t ff_sqrt_tab[256];
168
169 static inline int av_log2_16bit(unsigned int v);
170
171 static inline av_const unsigned int ff_sqrt(unsigned int a)
172 {
173 unsigned int b;
174
175 if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
176 else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
177 #ifndef CONFIG_SMALL
178 else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
179 else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ] ;
180 #endif
181 else{
182 int s= av_log2_16bit(a>>16)>>1;
183 unsigned int c= a>>(s+2);
184 b= ff_sqrt_tab[c>>(s+8)];
185 b= FASTDIV(c,b) + (b<<s);
186 }
187
188 return b - (a<b*b);
189 }
190
191 #if defined(ARCH_X86)
192 #define MASK_ABS(mask, level)\
193 asm volatile(\
194 "cltd \n\t"\
195 "xorl %1, %0 \n\t"\
196 "subl %1, %0 \n\t"\
197 : "+a" (level), "=&d" (mask)\
198 );
199 #else
200 #define MASK_ABS(mask, level)\
201 mask= level>>31;\
202 level= (level^mask)-mask;
203 #endif
204
205 #ifdef HAVE_CMOV
206 #define COPY3_IF_LT(x,y,a,b,c,d)\
207 asm volatile (\
208 "cmpl %0, %3 \n\t"\
209 "cmovl %3, %0 \n\t"\
210 "cmovl %4, %1 \n\t"\
211 "cmovl %5, %2 \n\t"\
212 : "+&r" (x), "+&r" (a), "+r" (c)\
213 : "r" (y), "r" (b), "r" (d)\
214 );
215 #else
216 #define COPY3_IF_LT(x,y,a,b,c,d)\
217 if((y)<(x)){\
218 (x)=(y);\
219 (a)=(b);\
220 (c)=(d);\
221 }
222 #endif
223
224 /* avoid usage of various functions */
225 #undef malloc
226 #define malloc please_use_av_malloc
227 #undef free
228 #define free please_use_av_free
229 #undef realloc
230 #define realloc please_use_av_realloc
231 #undef time
232 #define time time_is_forbidden_due_to_security_issues
233 #undef rand
234 #define rand rand_is_forbidden_due_to_state_trashing_use_av_random
235 #undef srand
236 #define srand srand_is_forbidden_due_to_state_trashing_use_av_init_random
237 #undef random
238 #define random random_is_forbidden_due_to_state_trashing_use_av_random
239 #undef sprintf
240 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
241 #undef strcat
242 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
243 #undef exit
244 #define exit exit_is_forbidden
245 #if !(defined(LIBAVFORMAT_BUILD) || defined(FFMPEG_FRAMEHOOK_H))
246 #undef printf
247 #define printf please_use_av_log
248 #undef fprintf
249 #define fprintf please_use_av_log
250 #undef puts
251 #define puts please_use_av_log
252 #undef perror
253 #define perror please_use_av_log_instead_of_perror
254 #endif
255
256 #define CHECKED_ALLOCZ(p, size)\
257 {\
258 p= av_mallocz(size);\
259 if(p==NULL && (size)!=0){\
260 av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
261 goto fail;\
262 }\
263 }
264
265 #ifndef HAVE_LLRINT
266 static av_always_inline av_const long long llrint(double x)
267 {
268 return rint(x);
269 }
270 #endif /* HAVE_LLRINT */
271
272 #ifndef HAVE_LRINT
273 static av_always_inline av_const long int lrint(double x)
274 {
275 return rint(x);
276 }
277 #endif /* HAVE_LRINT */
278
279 #ifndef HAVE_LRINTF
280 static av_always_inline av_const long int lrintf(float x)
281 {
282 return (int)(rint(x));
283 }
284 #endif /* HAVE_LRINTF */
285
286 #ifndef HAVE_ROUND
287 static av_always_inline av_const double round(double x)
288 {
289 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
290 }
291 #endif /* HAVE_ROUND */
292
293 #ifndef HAVE_ROUNDF
294 static av_always_inline av_const float roundf(float x)
295 {
296 return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
297 }
298 #endif /* HAVE_ROUNDF */
299
300 #endif /* FFMPEG_INTERNAL_H */