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[libav.git] / libavutil / internal.h
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1/*
2 * copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
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19/**
20 * @file internal.h
21 * common internal api header.
22 */
23
24#ifndef INTERNAL_H
25#define INTERNAL_H
26
27#if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
28# define PIC
29#endif
30
31# ifndef ENODATA
32# define ENODATA 61
33# endif
34
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35#include "bswap.h"
36
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37#include <stddef.h>
38#ifndef offsetof
39# define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
40#endif
41
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42#ifdef __MINGW32__
43# ifdef _DEBUG
44# define DEBUG
45# endif
46
47# define snprintf _snprintf
48# define vsnprintf _vsnprintf
49
50# ifdef CONFIG_WINCE
51# define perror(a)
52# endif
53
54/* __MINGW32__ end */
55#elif defined (CONFIG_OS2)
56/* OS/2 EMX */
57
58#include <float.h>
59
60#endif /* !__MINGW32__ && CONFIG_OS2 */
61
62# ifdef USE_FASTMEMCPY
f4bd289a 63# include "libvo/fastmemcpy.h"
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64# endif
65
66// Use rip-relative addressing if compiling PIC code on x86-64.
67# if defined(__MINGW32__) || defined(__CYGWIN__) || \
68 defined(__OS2__) || (defined (__OpenBSD__) && !defined(__ELF__))
69# if defined(ARCH_X86_64) && defined(PIC)
70# define MANGLE(a) "_" #a"(%%rip)"
71# else
72# define MANGLE(a) "_" #a
73# endif
74# else
75# if defined(ARCH_X86_64) && defined(PIC)
76# define MANGLE(a) #a"(%%rip)"
77# elif defined(CONFIG_DARWIN)
78# define MANGLE(a) "_" #a
79# else
80# define MANGLE(a) #a
81# endif
82# endif
83
84/* debug stuff */
85
86# if !defined(DEBUG) && !defined(NDEBUG)
87# define NDEBUG
88# endif
89# include <assert.h>
90
91/* dprintf macros */
92# ifdef DEBUG
93# define dprintf(fmt,...) av_log(NULL, AV_LOG_DEBUG, fmt, __VA_ARGS__)
94# else
95# define dprintf(fmt,...)
96# endif
97
98# ifdef CONFIG_WINCE
99# define abort()
100# endif
101
102# define av_abort() do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
103
104extern const uint32_t inverse[256];
105
106#if defined(ARCH_X86) || defined(ARCH_X86_64)
107# define FASTDIV(a,b) \
108 ({\
109 int ret,dmy;\
110 asm volatile(\
111 "mull %3"\
112 :"=d"(ret),"=a"(dmy)\
113 :"1"(a),"g"(inverse[b])\
114 );\
115 ret;\
116 })
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117#elif defined(ARCH_ARMV4L)
118# define FASTDIV(a,b) \
119 ({\
120 int ret,dmy;\
121 asm volatile(\
122 "umull %1, %0, %2, %3"\
123 :"=&r"(ret),"=&r"(dmy)\
124 :"r"(a),"r"(inverse[b])\
125 );\
126 ret;\
127 })
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128#elif defined(CONFIG_FASTDIV)
129# define FASTDIV(a,b) ((uint32_t)((((uint64_t)a)*inverse[b])>>32))
130#else
131# define FASTDIV(a,b) ((a)/(b))
132#endif
133
134/* math */
135extern FF_IMPORT_ATTR const uint8_t ff_sqrt_tab[128];
136
137static inline int ff_sqrt(int a)
138{
139 int ret=0;
140 int s;
141 int ret_sq=0;
142
143 if(a<128) return ff_sqrt_tab[a];
144
145 for(s=15; s>=0; s--){
146 int b= ret_sq + (1<<(s*2)) + (ret<<s)*2;
147 if(b<=a){
148 ret_sq=b;
149 ret+= 1<<s;
150 }
151 }
152 return ret;
153}
154
155#if defined(ARCH_X86) || defined(ARCH_X86_64)
156#define MASK_ABS(mask, level)\
157 asm volatile(\
158 "cdq \n\t"\
159 "xorl %1, %0 \n\t"\
160 "subl %1, %0 \n\t"\
161 : "+a" (level), "=&d" (mask)\
162 );
163#else
164#define MASK_ABS(mask, level)\
165 mask= level>>31;\
166 level= (level^mask)-mask;
167#endif
168
169#if __CPU__ >= 686 && !defined(RUNTIME_CPUDETECT)
170#define COPY3_IF_LT(x,y,a,b,c,d)\
171asm volatile (\
172 "cmpl %0, %3 \n\t"\
173 "cmovl %3, %0 \n\t"\
174 "cmovl %4, %1 \n\t"\
175 "cmovl %5, %2 \n\t"\
176 : "+r" (x), "+r" (a), "+r" (c)\
177 : "r" (y), "r" (b), "r" (d)\
178);
179#else
180#define COPY3_IF_LT(x,y,a,b,c,d)\
181if((y)<(x)){\
182 (x)=(y);\
183 (a)=(b);\
184 (c)=(d);\
185}
186#endif
187
188/* avoid usage of various functions */
189#define malloc please_use_av_malloc
190#define free please_use_av_free
191#define realloc please_use_av_realloc
192#define time time_is_forbidden_due_to_security_issues
193#define rand rand_is_forbidden_due_to_state_trashing
194#define srand srand_is_forbidden_due_to_state_trashing
195#define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
196#define strcat strcat_is_forbidden_due_to_security_issues_use_pstrcat
197#if !(defined(LIBAVFORMAT_BUILD) || defined(_FRAMEHOOK_H))
198#define printf please_use_av_log
199#define fprintf please_use_av_log
200#endif
201
202#define CHECKED_ALLOCZ(p, size)\
203{\
204 p= av_mallocz(size);\
205 if(p==NULL && (size)!=0){\
206 perror("malloc");\
207 goto fail;\
208 }\
209}
210
211#ifndef HAVE_LRINTF
212/* XXX: add ISOC specific test to avoid specific BSD testing. */
213/* better than nothing implementation. */
214/* btw, rintf() is existing on fbsd too -- alex */
215static always_inline long int lrintf(float x)
216{
217#ifdef __MINGW32__
218# ifdef ARCH_X86
219 int32_t i;
220 asm volatile(
221 "fistpl %0\n\t"
222 : "=m" (i) : "t" (x) : "st"
223 );
224 return i;
225# else
226 /* XXX: incorrect, but make it compile */
227 return (int)(x + (x < 0 ? -0.5 : 0.5));
228# endif /* ARCH_X86 */
229#else
230 return (int)(rint(x));
231#endif /* __MINGW32__ */
232}
233#endif /* HAVE_LRINTF */
234
235#endif /* INTERNAL_H */