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
  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, 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 defined(ARCH_ARMV4L)
 152 #    define FASTDIV(a,b) \
 153     ({\
 154         int ret,dmy;\
 155         __asm__ volatile(\
 156             "umull %1, %0, %2, %3"\
 157             :"=&r"(ret),"=&r"(dmy)\
 158             :"r"(a),"r"(ff_inverse[b])\
 159             );\
 160         ret;\
 161     })
 162 #elif defined(CONFIG_FASTDIV)
 163 #    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
 164 #else
 165 #    define FASTDIV(a,b)   ((a)/(b))
 166 #endif
 167
 168 extern const uint8_t ff_sqrt_tab[256];
 169
 170 static inline int av_log2_16bit(unsigned int v);
 171
 172 static inline av_const unsigned int ff_sqrt(unsigned int a)
 173 {
 174     unsigned int b;
 175
 176     if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
 177     else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
 178 #ifndef CONFIG_SMALL
 179     else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
 180     else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ]   ;
 181 #endif
 182     else{
 183         int s= av_log2_16bit(a>>16)>>1;
 184         unsigned int c= a>>(s+2);
 185         b= ff_sqrt_tab[c>>(s+8)];
 186         b= FASTDIV(c,b) + (b<<s);
 187     }
 188
 189     return b - (a<b*b);
 190 }
 191
 192 #if defined(ARCH_X86)
 193 #define MASK_ABS(mask, level)\
 194             __asm__ volatile(\
 195                 "cltd                   \n\t"\
 196                 "xorl %1, %0            \n\t"\
 197                 "subl %1, %0            \n\t"\
 198                 : "+a" (level), "=&d" (mask)\
 199             );
 200 #else
 201 #define MASK_ABS(mask, level)\
 202             mask= level>>31;\
 203             level= (level^mask)-mask;
 204 #endif
 205
 206 #ifdef HAVE_CMOV
 207 #define COPY3_IF_LT(x,y,a,b,c,d)\
 208 __asm__ volatile (\
 209     "cmpl %0, %3        \n\t"\
 210     "cmovl %3, %0       \n\t"\
 211     "cmovl %4, %1       \n\t"\
 212     "cmovl %5, %2       \n\t"\
 213     : "+&r" (x), "+&r" (a), "+r" (c)\
 214     : "r" (y), "r" (b), "r" (d)\
 215 );
 216 #else
 217 #define COPY3_IF_LT(x,y,a,b,c,d)\
 218 if((y)<(x)){\
 219      (x)=(y);\
 220      (a)=(b);\
 221      (c)=(d);\
 222 }
 223 #endif
 224
 225 /* avoid usage of various functions */
 226 #undef  malloc
 227 #define malloc please_use_av_malloc
 228 #undef  free
 229 #define free please_use_av_free
 230 #undef  realloc
 231 #define realloc please_use_av_realloc
 232 #undef  time
 233 #define time time_is_forbidden_due_to_security_issues
 234 #undef  rand
 235 #define rand rand_is_forbidden_due_to_state_trashing_use_av_random
 236 #undef  srand
 237 #define srand srand_is_forbidden_due_to_state_trashing_use_av_init_random
 238 #undef  random
 239 #define random random_is_forbidden_due_to_state_trashing_use_av_random
 240 #undef  sprintf
 241 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
 242 #undef  strcat
 243 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
 244 #undef  exit
 245 #define exit exit_is_forbidden
 246 #ifndef LIBAVFORMAT_BUILD
 247 #undef  printf
 248 #define printf please_use_av_log
 249 #undef  fprintf
 250 #define fprintf please_use_av_log
 251 #undef  puts
 252 #define puts please_use_av_log
 253 #undef  perror
 254 #define perror please_use_av_log_instead_of_perror
 255 #endif
 256
 257 #define CHECKED_ALLOCZ(p, size)\
 258 {\
 259     p= av_mallocz(size);\
 260     if(p==NULL && (size)!=0){\
 261         av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
 262         goto fail;\
 263     }\
 264 }
 265
 266 #ifndef HAVE_LLRINT
 267 static av_always_inline av_const long long llrint(double x)
 268 {
 269     return rint(x);
 270 }
 271 #endif /* HAVE_LLRINT */
 272
 273 #ifndef HAVE_LRINT
 274 static av_always_inline av_const long int lrint(double x)
 275 {
 276     return rint(x);
 277 }
 278 #endif /* HAVE_LRINT */
 279
 280 #ifndef HAVE_LRINTF
 281 static av_always_inline av_const long int lrintf(float x)
 282 {
 283     return (int)(rint(x));
 284 }
 285 #endif /* HAVE_LRINTF */
 286
 287 #ifndef HAVE_ROUND
 288 static av_always_inline av_const double round(double x)
 289 {
 290     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 291 }
 292 #endif /* HAVE_ROUND */
 293
 294 #ifndef HAVE_ROUNDF
 295 static av_always_inline av_const float roundf(float x)
 296 {
 297     return (x > 0) ? floor(x + 0.5) : ceil(x - 0.5);
 298 }
 299 #endif /* HAVE_ROUNDF */
 300
 301 #endif /* AVUTIL_INTERNAL_H */