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 */