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 libavutil/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 <limits.h>
  34 #include <stdint.h>
  35 #include <stddef.h>
  36 #include <assert.h>
  37 #include "config.h"
  38 #include "common.h"
  39 #include "mem.h"
  40 #include "timer.h"
  41
  42 #ifndef attribute_align_arg
  43 #if (!defined(__ICC) || __ICC > 1100) && AV_GCC_VERSION_AT_LEAST(4,2)
  44 #    define attribute_align_arg __attribute__((force_align_arg_pointer))
  45 #else
  46 #    define attribute_align_arg
  47 #endif
  48 #endif
  49
  50 #ifndef attribute_used
  51 #if AV_GCC_VERSION_AT_LEAST(3,1)
  52 #    define attribute_used __attribute__((used))
  53 #else
  54 #    define attribute_used
  55 #endif
  56 #endif
  57
  58 #ifndef INT16_MIN
  59 #define INT16_MIN       (-0x7fff-1)
  60 #endif
  61
  62 #ifndef INT16_MAX
  63 #define INT16_MAX       0x7fff
  64 #endif
  65
  66 #ifndef INT32_MIN
  67 #define INT32_MIN       (-0x7fffffff-1)
  68 #endif
  69
  70 #ifndef INT32_MAX
  71 #define INT32_MAX       0x7fffffff
  72 #endif
  73
  74 #ifndef UINT32_MAX
  75 #define UINT32_MAX      0xffffffff
  76 #endif
  77
  78 #ifndef INT64_MIN
  79 #define INT64_MIN       (-0x7fffffffffffffffLL-1)
  80 #endif
  81
  82 #ifndef INT64_MAX
  83 #define INT64_MAX INT64_C(9223372036854775807)
  84 #endif
  85
  86 #ifndef UINT64_MAX
  87 #define UINT64_MAX UINT64_C(0xFFFFFFFFFFFFFFFF)
  88 #endif
  89
  90 #ifndef INT_BIT
  91 #    define INT_BIT (CHAR_BIT * sizeof(int))
  92 #endif
  93
  94 #if ( defined(__PIC__) || defined(__pic__) ) && ! defined(PIC)
  95 #    define PIC
  96 #endif
  97
  98 #ifndef offsetof
  99 #    define offsetof(T,F) ((unsigned int)((char *)&((T *)0)->F))
 100 #endif
 101
 102 // Use rip-relative addressing if compiling PIC code on x86-64.
 103 #if ARCH_X86_64 && defined(PIC)
 104 #    define LOCAL_MANGLE(a) #a "(%%rip)"
 105 #else
 106 #    define LOCAL_MANGLE(a) #a
 107 #endif
 108
 109 #define MANGLE(a) EXTERN_PREFIX LOCAL_MANGLE(a)
 110
 111 /* debug stuff */
 112
 113 /* dprintf macros */
 114 #ifdef DEBUG
 115 #    define dprintf(pctx, ...) av_log(pctx, AV_LOG_DEBUG, __VA_ARGS__)
 116 #else
 117 #    define dprintf(pctx, ...)
 118 #endif
 119
 120 #define av_abort()      do { av_log(NULL, AV_LOG_ERROR, "Abort at %s:%d\n", __FILE__, __LINE__); abort(); } while (0)
 121
 122 /* math */
 123
 124 extern const uint32_t ff_inverse[256];
 125
 126 #if ARCH_X86
 127 #    define FASTDIV(a,b) \
 128     ({\
 129         int ret,dmy;\
 130         __asm__ volatile(\
 131             "mull %3"\
 132             :"=d"(ret),"=a"(dmy)\
 133             :"1"(a),"g"(ff_inverse[b])\
 134             );\
 135         ret;\
 136     })
 137 #elif HAVE_ARMV6 && HAVE_INLINE_ASM
 138 static inline av_const int FASTDIV(int a, int b)
 139 {
 140     int r, t;
 141     __asm__ volatile("cmp     %3, #2               \n\t"
 142                      "ldr     %1, [%4, %3, lsl #2] \n\t"
 143                      "lsrle   %0, %2, #1           \n\t"
 144                      "smmulgt %0, %1, %2           \n\t"
 145                      : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
 146     return r;
 147 }
 148 #elif ARCH_ARM && HAVE_INLINE_ASM
 149 static inline av_const int FASTDIV(int a, int b)
 150 {
 151     int r, t;
 152     __asm__ volatile ("umull %1, %0, %2, %3"
 153                       : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
 154     return r;
 155 }
 156 #elif CONFIG_FASTDIV
 157 #    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a)*ff_inverse[b])>>32))
 158 #else
 159 #    define FASTDIV(a,b)   ((a)/(b))
 160 #endif
 161
 162 extern const uint8_t ff_sqrt_tab[256];
 163
 164 static inline av_const unsigned int ff_sqrt(unsigned int a)
 165 {
 166     unsigned int b;
 167
 168     if(a<255) return (ff_sqrt_tab[a+1]-1)>>4;
 169     else if(a<(1<<12)) b= ff_sqrt_tab[a>>4 ]>>2;
 170 #if !CONFIG_SMALL
 171     else if(a<(1<<14)) b= ff_sqrt_tab[a>>6 ]>>1;
 172     else if(a<(1<<16)) b= ff_sqrt_tab[a>>8 ]   ;
 173 #endif
 174     else{
 175         int s= av_log2_16bit(a>>16)>>1;
 176         unsigned int c= a>>(s+2);
 177         b= ff_sqrt_tab[c>>(s+8)];
 178         b= FASTDIV(c,b) + (b<<s);
 179     }
 180
 181     return b - (a<b*b);
 182 }
 183
 184 #if ARCH_X86
 185 #define MASK_ABS(mask, level)\
 186             __asm__ volatile(\
 187                 "cltd                   \n\t"\
 188                 "xorl %1, %0            \n\t"\
 189                 "subl %1, %0            \n\t"\
 190                 : "+a" (level), "=&d" (mask)\
 191             );
 192 #else
 193 #define MASK_ABS(mask, level)\
 194             mask= level>>31;\
 195             level= (level^mask)-mask;
 196 #endif
 197
 198 #if HAVE_CMOV
 199 #define COPY3_IF_LT(x,y,a,b,c,d)\
 200 __asm__ volatile (\
 201     "cmpl %0, %3        \n\t"\
 202     "cmovl %3, %0       \n\t"\
 203     "cmovl %4, %1       \n\t"\
 204     "cmovl %5, %2       \n\t"\
 205     : "+&r" (x), "+&r" (a), "+r" (c)\
 206     : "r" (y), "r" (b), "r" (d)\
 207 );
 208 #else
 209 #define COPY3_IF_LT(x,y,a,b,c,d)\
 210 if((y)<(x)){\
 211      (x)=(y);\
 212      (a)=(b);\
 213      (c)=(d);\
 214 }
 215 #endif
 216
 217 /* avoid usage of dangerous/inappropriate system functions */
 218 #undef  malloc
 219 #define malloc please_use_av_malloc
 220 #undef  free
 221 #define free please_use_av_free
 222 #undef  realloc
 223 #define realloc please_use_av_realloc
 224 #undef  time
 225 #define time time_is_forbidden_due_to_security_issues
 226 #undef  rand
 227 #define rand rand_is_forbidden_due_to_state_trashing_use_av_lfg_get
 228 #undef  srand
 229 #define srand srand_is_forbidden_due_to_state_trashing_use_av_lfg_init
 230 #undef  random
 231 #define random random_is_forbidden_due_to_state_trashing_use_av_lfg_get
 232 #undef  sprintf
 233 #define sprintf sprintf_is_forbidden_due_to_security_issues_use_snprintf
 234 #undef  strcat
 235 #define strcat strcat_is_forbidden_due_to_security_issues_use_av_strlcat
 236 #undef  exit
 237 #define exit exit_is_forbidden
 238 #ifndef LIBAVFORMAT_BUILD
 239 #undef  printf
 240 #define printf please_use_av_log_instead_of_printf
 241 #undef  fprintf
 242 #define fprintf please_use_av_log_instead_of_fprintf
 243 #undef  puts
 244 #define puts please_use_av_log_instead_of_puts
 245 #undef  perror
 246 #define perror please_use_av_log_instead_of_perror
 247 #endif
 248
 249 #define CHECKED_ALLOCZ(p, size)\
 250 {\
 251     p= av_mallocz(size);\
 252     if(p==NULL && (size)!=0){\
 253         av_log(NULL, AV_LOG_ERROR, "Cannot allocate memory.");\
 254         goto fail;\
 255     }\
 256 }
 257
 258 #if defined(__ICC) || defined(__SUNPRO_C)
 259     #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
 260     #define DECLARE_ASM_CONST(n,t,v)    const t __attribute__ ((aligned (n))) v
 261 #elif defined(__GNUC__)
 262     #define DECLARE_ALIGNED(n,t,v)      t v __attribute__ ((aligned (n)))
 263     #define DECLARE_ASM_CONST(n,t,v)    static const t v attribute_used __attribute__ ((aligned (n)))
 264 #elif defined(_MSC_VER)
 265     #define DECLARE_ALIGNED(n,t,v)      __declspec(align(n)) t v
 266     #define DECLARE_ASM_CONST(n,t,v)    __declspec(align(n)) static const t v
 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 modification. 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 */