| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 | ||
| 23 | * common internal and external API header | ||
| 24 | */ | ||
| 25 | |||
| 26 | #ifndef AVUTIL_COMMON_H | ||
| 27 | #define AVUTIL_COMMON_H | ||
| 28 | |||
| 29 | #if defined(__cplusplus) && !defined(__STDC_CONSTANT_MACROS) && !defined(UINT64_C) | ||
| 30 | #error missing -D__STDC_CONSTANT_MACROS / #define __STDC_CONSTANT_MACROS | ||
| 31 | #endif | ||
| 32 | |||
| 33 | #include <errno.h> | ||
| 34 | #include <inttypes.h> | ||
| 35 | #include <limits.h> | ||
| 36 | #include <math.h> | ||
| 37 | #include <stdint.h> | ||
| 38 | #include <stdio.h> | ||
| 39 | #include <stdlib.h> | ||
| 40 | #include <string.h> | ||
| 41 | |||
| 42 | #include "attributes.h" | ||
| 43 | #include "error.h" | ||
| 44 | #include "macros.h" | ||
| 45 | #include "version.h" | ||
| 46 | |||
| 47 | #ifdef HAVE_AV_CONFIG_H | ||
| 48 | # include "config.h" | ||
| 49 | # include "intmath.h" | ||
| 50 | # include "internal.h" | ||
| 51 | #else | ||
| 52 | # include "mem.h" | ||
| 53 | #endif /* HAVE_AV_CONFIG_H */ | ||
| 54 | |||
| 55 | //rounded division & shift | ||
| 56 | #define RSHIFT(a,b) ((a) > 0 ? ((a) + ((1<<(b))>>1))>>(b) : ((a) + ((1<<(b))>>1)-1)>>(b)) | ||
| 57 | /* assume b>0 */ | ||
| 58 | #define ROUNDED_DIV(a,b) (((a)>=0 ? (a) + ((b)>>1) : (a) - ((b)>>1))/(b)) | ||
| 59 | /* Fast a/(1<<b) rounded toward +inf. Assume a>=0 and b>=0 */ | ||
| 60 | #define AV_CEIL_RSHIFT(a,b) (!av_builtin_constant_p(b) ? -((-(a)) >> (b)) \ | ||
| 61 | : ((a) + (1<<(b)) - 1) >> (b)) | ||
| 62 | /* Backwards compat. */ | ||
| 63 | #define FF_CEIL_RSHIFT AV_CEIL_RSHIFT | ||
| 64 | |||
| 65 | #define FFUDIV(a,b) (((a)>0 ?(a):(a)-(b)+1) / (b)) | ||
| 66 | #define FFUMOD(a,b) ((a)-(b)*FFUDIV(a,b)) | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Absolute value, Note, INT_MIN / INT64_MIN result in undefined behavior as they | ||
| 70 | * are not representable as absolute values of their type. This is the same | ||
| 71 | * as with *abs() | ||
| 72 | * @see FFNABS() | ||
| 73 | */ | ||
| 74 | #define FFABS(a) ((a) >= 0 ? (a) : (-(a))) | ||
| 75 | #define FFSIGN(a) ((a) > 0 ? 1 : -1) | ||
| 76 | |||
| 77 | /** | ||
| 78 | * Negative Absolute value. | ||
| 79 | * this works for all integers of all types. | ||
| 80 | * As with many macros, this evaluates its argument twice, it thus must not have | ||
| 81 | * a sideeffect, that is FFNABS(x++) has undefined behavior. | ||
| 82 | */ | ||
| 83 | #define FFNABS(a) ((a) <= 0 ? (a) : (-(a))) | ||
| 84 | |||
| 85 | /** | ||
| 86 | * Unsigned Absolute value. | ||
| 87 | * This takes the absolute value of a signed int and returns it as a unsigned. | ||
| 88 | * This also works with INT_MIN which would otherwise not be representable | ||
| 89 | * As with many macros, this evaluates its argument twice. | ||
| 90 | */ | ||
| 91 | #define FFABSU(a) ((a) <= 0 ? -(unsigned)(a) : (unsigned)(a)) | ||
| 92 | #define FFABS64U(a) ((a) <= 0 ? -(uint64_t)(a) : (uint64_t)(a)) | ||
| 93 | |||
| 94 | /* misc math functions */ | ||
| 95 | |||
| 96 | #ifndef av_ceil_log2 | ||
| 97 | # define av_ceil_log2 av_ceil_log2_c | ||
| 98 | #endif | ||
| 99 | #ifndef av_clip | ||
| 100 | # define av_clip av_clip_c | ||
| 101 | #endif | ||
| 102 | #ifndef av_clip64 | ||
| 103 | # define av_clip64 av_clip64_c | ||
| 104 | #endif | ||
| 105 | #ifndef av_clip_uint8 | ||
| 106 | # define av_clip_uint8 av_clip_uint8_c | ||
| 107 | #endif | ||
| 108 | #ifndef av_clip_int8 | ||
| 109 | # define av_clip_int8 av_clip_int8_c | ||
| 110 | #endif | ||
| 111 | #ifndef av_clip_uint16 | ||
| 112 | # define av_clip_uint16 av_clip_uint16_c | ||
| 113 | #endif | ||
| 114 | #ifndef av_clip_int16 | ||
| 115 | # define av_clip_int16 av_clip_int16_c | ||
| 116 | #endif | ||
| 117 | #ifndef av_clipl_int32 | ||
| 118 | # define av_clipl_int32 av_clipl_int32_c | ||
| 119 | #endif | ||
| 120 | #ifndef av_clip_intp2 | ||
| 121 | # define av_clip_intp2 av_clip_intp2_c | ||
| 122 | #endif | ||
| 123 | #ifndef av_clip_uintp2 | ||
| 124 | # define av_clip_uintp2 av_clip_uintp2_c | ||
| 125 | #endif | ||
| 126 | #ifndef av_sat_add32 | ||
| 127 | # define av_sat_add32 av_sat_add32_c | ||
| 128 | #endif | ||
| 129 | #ifndef av_sat_dadd32 | ||
| 130 | # define av_sat_dadd32 av_sat_dadd32_c | ||
| 131 | #endif | ||
| 132 | #ifndef av_sat_sub32 | ||
| 133 | # define av_sat_sub32 av_sat_sub32_c | ||
| 134 | #endif | ||
| 135 | #ifndef av_sat_dsub32 | ||
| 136 | # define av_sat_dsub32 av_sat_dsub32_c | ||
| 137 | #endif | ||
| 138 | #ifndef av_sat_add64 | ||
| 139 | # define av_sat_add64 av_sat_add64_c | ||
| 140 | #endif | ||
| 141 | #ifndef av_sat_sub64 | ||
| 142 | # define av_sat_sub64 av_sat_sub64_c | ||
| 143 | #endif | ||
| 144 | #ifndef av_clipf | ||
| 145 | # define av_clipf av_clipf_c | ||
| 146 | #endif | ||
| 147 | #ifndef av_clipd | ||
| 148 | # define av_clipd av_clipd_c | ||
| 149 | #endif | ||
| 150 | #ifndef av_zero_extend | ||
| 151 | # define av_zero_extend av_zero_extend_c | ||
| 152 | #endif | ||
| 153 | #ifndef av_popcount | ||
| 154 | # define av_popcount av_popcount_c | ||
| 155 | #endif | ||
| 156 | #ifndef av_popcount64 | ||
| 157 | # define av_popcount64 av_popcount64_c | ||
| 158 | #endif | ||
| 159 | #ifndef av_parity | ||
| 160 | # define av_parity av_parity_c | ||
| 161 | #endif | ||
| 162 | |||
| 163 | #ifndef av_log2 | ||
| 164 | av_const int av_log2(unsigned v); | ||
| 165 | #endif | ||
| 166 | |||
| 167 | #ifndef av_log2_16bit | ||
| 168 | av_const int av_log2_16bit(unsigned v); | ||
| 169 | #endif | ||
| 170 | |||
| 171 | /** | ||
| 172 | * Clip a signed integer value into the amin-amax range. | ||
| 173 | * @param a value to clip | ||
| 174 | * @param amin minimum value of the clip range | ||
| 175 | * @param amax maximum value of the clip range | ||
| 176 | * @return clipped value | ||
| 177 | */ | ||
| 178 | 12420316195 | static av_always_inline av_const int av_clip_c(int a, int amin, int amax) | |
| 179 | { | ||
| 180 | #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 | ||
| 181 | if (amin > amax) abort(); | ||
| 182 | #endif | ||
| 183 |
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12420316195 | if (a < amin) return amin; |
| 184 |
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11893359518 | else if (a > amax) return amax; |
| 185 | 11344645739 | else return a; | |
| 186 | } | ||
| 187 | |||
| 188 | /** | ||
| 189 | * Clip a signed 64bit integer value into the amin-amax range. | ||
| 190 | * @param a value to clip | ||
| 191 | * @param amin minimum value of the clip range | ||
| 192 | * @param amax maximum value of the clip range | ||
| 193 | * @return clipped value | ||
| 194 | */ | ||
| 195 | 30191620 | static av_always_inline av_const int64_t av_clip64_c(int64_t a, int64_t amin, int64_t amax) | |
| 196 | { | ||
| 197 | #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 | ||
| 198 | if (amin > amax) abort(); | ||
| 199 | #endif | ||
| 200 |
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30191620 | if (a < amin) return amin; |
| 201 |
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30191476 | else if (a > amax) return amax; |
| 202 | 30189651 | else return a; | |
| 203 | } | ||
| 204 | |||
| 205 | /** | ||
| 206 | * Clip a signed integer value into the 0-255 range. | ||
| 207 | * @param a value to clip | ||
| 208 | * @return clipped value | ||
| 209 | */ | ||
| 210 | 30758874225 | static av_always_inline av_const uint8_t av_clip_uint8_c(int a) | |
| 211 | { | ||
| 212 |
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30758874225 | if (a&(~0xFF)) return (~a)>>31; |
| 213 | 30674058443 | else return a; | |
| 214 | } | ||
| 215 | |||
| 216 | /** | ||
| 217 | * Clip a signed integer value into the -128,127 range. | ||
| 218 | * @param a value to clip | ||
| 219 | * @return clipped value | ||
| 220 | */ | ||
| 221 | 7721018 | static av_always_inline av_const int8_t av_clip_int8_c(int a) | |
| 222 | { | ||
| 223 |
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7721018 | if ((a+0x80U) & ~0xFF) return (a>>31) ^ 0x7F; |
| 224 | 7721000 | else return a; | |
| 225 | } | ||
| 226 | |||
| 227 | /** | ||
| 228 | * Clip a signed integer value into the 0-65535 range. | ||
| 229 | * @param a value to clip | ||
| 230 | * @return clipped value | ||
| 231 | */ | ||
| 232 | 139030716 | static av_always_inline av_const uint16_t av_clip_uint16_c(int a) | |
| 233 | { | ||
| 234 |
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139030716 | if (a&(~0xFFFF)) return (~a)>>31; |
| 235 | 138999286 | else return a; | |
| 236 | } | ||
| 237 | |||
| 238 | /** | ||
| 239 | * Clip a signed integer value into the -32768,32767 range. | ||
| 240 | * @param a value to clip | ||
| 241 | * @return clipped value | ||
| 242 | */ | ||
| 243 | 2838113196 | static av_always_inline av_const int16_t av_clip_int16_c(int a) | |
| 244 | { | ||
| 245 |
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2838113196 | if ((a+0x8000U) & ~0xFFFF) return (a>>31) ^ 0x7FFF; |
| 246 | 2834898663 | else return a; | |
| 247 | } | ||
| 248 | |||
| 249 | /** | ||
| 250 | * Clip a signed 64-bit integer value into the -2147483648,2147483647 range. | ||
| 251 | * @param a value to clip | ||
| 252 | * @return clipped value | ||
| 253 | */ | ||
| 254 | 467079398 | static av_always_inline av_const int32_t av_clipl_int32_c(int64_t a) | |
| 255 | { | ||
| 256 |
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467079398 | if ((a+UINT64_C(0x80000000)) & ~UINT64_C(0xFFFFFFFF)) return (int32_t)((a>>63) ^ 0x7FFFFFFF); |
| 257 | 467064831 | else return (int32_t)a; | |
| 258 | } | ||
| 259 | |||
| 260 | /** | ||
| 261 | * Clip a signed integer into the -(2^p),(2^p-1) range. | ||
| 262 | * @param a value to clip | ||
| 263 | * @param p bit position to clip at | ||
| 264 | * @return clipped value | ||
| 265 | */ | ||
| 266 | 179714150 | static av_always_inline av_const int av_clip_intp2_c(int a, int p) | |
| 267 | { | ||
| 268 |
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179714150 | if (((unsigned)a + (1U << p)) & ~((2U << p) - 1)) |
| 269 | 363338 | return (a >> 31) ^ ((1 << p) - 1); | |
| 270 | else | ||
| 271 | 179350812 | return a; | |
| 272 | } | ||
| 273 | |||
| 274 | /** | ||
| 275 | * Clip a signed integer to an unsigned power of two range. | ||
| 276 | * @param a value to clip | ||
| 277 | * @param p bit position to clip at | ||
| 278 | * @return clipped value | ||
| 279 | */ | ||
| 280 | 5321345829 | static av_always_inline av_const unsigned av_clip_uintp2_c(int a, int p) | |
| 281 | { | ||
| 282 |
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5321345829 | if (a & ~((1U<<p) - 1)) return (~a) >> 31 & ((1U<<p) - 1); |
| 283 | 5232610019 | else return a; | |
| 284 | } | ||
| 285 | |||
| 286 | /** | ||
| 287 | * Clear high bits from an unsigned integer starting with specific bit position | ||
| 288 | * @param a value to clip | ||
| 289 | * @param p bit position to clip at. Must be between 0 and 31. | ||
| 290 | * @return clipped value | ||
| 291 | */ | ||
| 292 | 927383983 | static av_always_inline av_const unsigned av_zero_extend_c(unsigned a, unsigned p) | |
| 293 | { | ||
| 294 | #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 | ||
| 295 |
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36 | if (p > 31) abort(); |
| 296 | #endif | ||
| 297 | 927383983 | return a & ((1U << p) - 1); | |
| 298 | } | ||
| 299 | |||
| 300 | #if FF_API_MOD_UINTP2 | ||
| 301 | #ifndef av_mod_uintp2 | ||
| 302 | # define av_mod_uintp2 av_mod_uintp2_c | ||
| 303 | #endif | ||
| 304 | attribute_deprecated | ||
| 305 | static av_always_inline av_const unsigned av_mod_uintp2_c(unsigned a, unsigned p) | ||
| 306 | { | ||
| 307 | return av_zero_extend_c(a, p); | ||
| 308 | } | ||
| 309 | #endif | ||
| 310 | |||
| 311 | /** | ||
| 312 | * Add two signed 32-bit values with saturation. | ||
| 313 | * | ||
| 314 | * @param a one value | ||
| 315 | * @param b another value | ||
| 316 | * @return sum with signed saturation | ||
| 317 | */ | ||
| 318 | 1940611 | static av_always_inline int av_sat_add32_c(int a, int b) | |
| 319 | { | ||
| 320 | 1940611 | return av_clipl_int32((int64_t)a + b); | |
| 321 | } | ||
| 322 | |||
| 323 | /** | ||
| 324 | * Add a doubled value to another value with saturation at both stages. | ||
| 325 | * | ||
| 326 | * @param a first value | ||
| 327 | * @param b value doubled and added to a | ||
| 328 | * @return sum sat(a + sat(2*b)) with signed saturation | ||
| 329 | */ | ||
| 330 | 570760 | static av_always_inline int av_sat_dadd32_c(int a, int b) | |
| 331 | { | ||
| 332 | 570760 | return av_sat_add32(a, av_sat_add32(b, b)); | |
| 333 | } | ||
| 334 | |||
| 335 | /** | ||
| 336 | * Subtract two signed 32-bit values with saturation. | ||
| 337 | * | ||
| 338 | * @param a one value | ||
| 339 | * @param b another value | ||
| 340 | * @return difference with signed saturation | ||
| 341 | */ | ||
| 342 | 1470722 | static av_always_inline int av_sat_sub32_c(int a, int b) | |
| 343 | { | ||
| 344 | 1470722 | return av_clipl_int32((int64_t)a - b); | |
| 345 | } | ||
| 346 | |||
| 347 | /** | ||
| 348 | * Subtract a doubled value from another value with saturation at both stages. | ||
| 349 | * | ||
| 350 | * @param a first value | ||
| 351 | * @param b value doubled and subtracted from a | ||
| 352 | * @return difference sat(a - sat(2*b)) with signed saturation | ||
| 353 | */ | ||
| 354 | static av_always_inline int av_sat_dsub32_c(int a, int b) | ||
| 355 | { | ||
| 356 | return av_sat_sub32(a, av_sat_add32(b, b)); | ||
| 357 | } | ||
| 358 | |||
| 359 | /** | ||
| 360 | * Add two signed 64-bit values with saturation. | ||
| 361 | * | ||
| 362 | * @param a one value | ||
| 363 | * @param b another value | ||
| 364 | * @return sum with signed saturation | ||
| 365 | */ | ||
| 366 | 31278 | static av_always_inline int64_t av_sat_add64_c(int64_t a, int64_t b) { | |
| 367 | #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_add_overflow) | ||
| 368 | int64_t tmp; | ||
| 369 |
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31278 | return !__builtin_add_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN); |
| 370 | #else | ||
| 371 | int64_t s = a+(uint64_t)b; | ||
| 372 | if ((int64_t)(a^b | ~s^b) >= 0) | ||
| 373 | return INT64_MAX ^ (b >> 63); | ||
| 374 | return s; | ||
| 375 | #endif | ||
| 376 | } | ||
| 377 | |||
| 378 | /** | ||
| 379 | * Subtract two signed 64-bit values with saturation. | ||
| 380 | * | ||
| 381 | * @param a one value | ||
| 382 | * @param b another value | ||
| 383 | * @return difference with signed saturation | ||
| 384 | */ | ||
| 385 | 69801 | static av_always_inline int64_t av_sat_sub64_c(int64_t a, int64_t b) { | |
| 386 | #if (!defined(__INTEL_COMPILER) && AV_GCC_VERSION_AT_LEAST(5,1)) || AV_HAS_BUILTIN(__builtin_sub_overflow) | ||
| 387 | int64_t tmp; | ||
| 388 |
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69801 | return !__builtin_sub_overflow(a, b, &tmp) ? tmp : (tmp < 0 ? INT64_MAX : INT64_MIN); |
| 389 | #else | ||
| 390 | if (b <= 0 && a >= INT64_MAX + b) | ||
| 391 | return INT64_MAX; | ||
| 392 | if (b >= 0 && a <= INT64_MIN + b) | ||
| 393 | return INT64_MIN; | ||
| 394 | return a - b; | ||
| 395 | #endif | ||
| 396 | } | ||
| 397 | |||
| 398 | /** | ||
| 399 | * Clip a float value into the amin-amax range. | ||
| 400 | * If a is nan or -inf amin will be returned. | ||
| 401 | * If a is +inf amax will be returned. | ||
| 402 | * @param a value to clip | ||
| 403 | * @param amin minimum value of the clip range | ||
| 404 | * @param amax maximum value of the clip range | ||
| 405 | * @return clipped value | ||
| 406 | */ | ||
| 407 | 196608 | static av_always_inline av_const float av_clipf_c(float a, float amin, float amax) | |
| 408 | { | ||
| 409 | #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 | ||
| 410 | if (amin > amax) abort(); | ||
| 411 | #endif | ||
| 412 |
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196608 | return FFMIN(FFMAX(a, amin), amax); |
| 413 | } | ||
| 414 | |||
| 415 | /** | ||
| 416 | * Clip a double value into the amin-amax range. | ||
| 417 | * If a is nan or -inf amin will be returned. | ||
| 418 | * If a is +inf amax will be returned. | ||
| 419 | * @param a value to clip | ||
| 420 | * @param amin minimum value of the clip range | ||
| 421 | * @param amax maximum value of the clip range | ||
| 422 | * @return clipped value | ||
| 423 | */ | ||
| 424 | static av_always_inline av_const double av_clipd_c(double a, double amin, double amax) | ||
| 425 | { | ||
| 426 | #if defined(HAVE_AV_CONFIG_H) && defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 | ||
| 427 | if (amin > amax) abort(); | ||
| 428 | #endif | ||
| 429 | return FFMIN(FFMAX(a, amin), amax); | ||
| 430 | } | ||
| 431 | |||
| 432 | /** Compute ceil(log2(x)). | ||
| 433 | * @param x value used to compute ceil(log2(x)) | ||
| 434 | * @return computed ceiling of log2(x) | ||
| 435 | */ | ||
| 436 | 1133860 | static av_always_inline av_const int av_ceil_log2_c(int x) | |
| 437 | { | ||
| 438 | 1133860 | return av_log2((x - 1U) << 1); | |
| 439 | } | ||
| 440 | |||
| 441 | /** | ||
| 442 | * Count number of bits set to one in x | ||
| 443 | * @param x value to count bits of | ||
| 444 | * @return the number of bits set to one in x | ||
| 445 | */ | ||
| 446 | 733803 | static av_always_inline av_const int av_popcount_c(uint32_t x) | |
| 447 | { | ||
| 448 | 733803 | x -= (x >> 1) & 0x55555555; | |
| 449 | 733803 | x = (x & 0x33333333) + ((x >> 2) & 0x33333333); | |
| 450 | 733803 | x = (x + (x >> 4)) & 0x0F0F0F0F; | |
| 451 | 733803 | x += x >> 8; | |
| 452 | 733803 | return (x + (x >> 16)) & 0x3F; | |
| 453 | } | ||
| 454 | |||
| 455 | /** | ||
| 456 | * Count number of bits set to one in x | ||
| 457 | * @param x value to count bits of | ||
| 458 | * @return the number of bits set to one in x | ||
| 459 | */ | ||
| 460 | 330886 | static av_always_inline av_const int av_popcount64_c(uint64_t x) | |
| 461 | { | ||
| 462 | 330886 | return av_popcount((uint32_t)x) + av_popcount((uint32_t)(x >> 32)); | |
| 463 | } | ||
| 464 | |||
| 465 | static av_always_inline av_const int av_parity_c(uint32_t v) | ||
| 466 | { | ||
| 467 | return av_popcount(v) & 1; | ||
| 468 | } | ||
| 469 | |||
| 470 | /** | ||
| 471 | * Convert a UTF-8 character (up to 4 bytes) to its 32-bit UCS-4 encoded form. | ||
| 472 | * | ||
| 473 | * @param val Output value, must be an lvalue of type uint32_t. | ||
| 474 | * @param GET_BYTE Expression reading one byte from the input. | ||
| 475 | * Evaluated up to 7 times (4 for the currently | ||
| 476 | * assigned Unicode range). With a memory buffer | ||
| 477 | * input, this could be *ptr++, or if you want to make sure | ||
| 478 | * that *ptr stops at the end of a NULL terminated string then | ||
| 479 | * *ptr ? *ptr++ : 0 | ||
| 480 | * @param ERROR Expression to be evaluated on invalid input, | ||
| 481 | * typically a goto statement. | ||
| 482 | * | ||
| 483 | * @warning ERROR should not contain a loop control statement which | ||
| 484 | * could interact with the internal while loop, and should force an | ||
| 485 | * exit from the macro code (e.g. through a goto or a return) in order | ||
| 486 | * to prevent undefined results. | ||
| 487 | */ | ||
| 488 | #define GET_UTF8(val, GET_BYTE, ERROR)\ | ||
| 489 | val= (GET_BYTE);\ | ||
| 490 | {\ | ||
| 491 | uint32_t top = (val & 128) >> 1;\ | ||
| 492 | if ((val & 0xc0) == 0x80 || val >= 0xFE)\ | ||
| 493 | {ERROR}\ | ||
| 494 | while (val & top) {\ | ||
| 495 | unsigned int tmp = (GET_BYTE) - 128;\ | ||
| 496 | if(tmp>>6)\ | ||
| 497 | {ERROR}\ | ||
| 498 | val= (val<<6) + tmp;\ | ||
| 499 | top <<= 5;\ | ||
| 500 | }\ | ||
| 501 | val &= (top << 1) - 1;\ | ||
| 502 | } | ||
| 503 | |||
| 504 | /** | ||
| 505 | * Convert a UTF-16 character (2 or 4 bytes) to its 32-bit UCS-4 encoded form. | ||
| 506 | * | ||
| 507 | * @param val Output value, must be an lvalue of type uint32_t. | ||
| 508 | * @param GET_16BIT Expression returning two bytes of UTF-16 data converted | ||
| 509 | * to native byte order. Evaluated one or two times. | ||
| 510 | * @param ERROR Expression to be evaluated on invalid input, | ||
| 511 | * typically a goto statement. | ||
| 512 | */ | ||
| 513 | #define GET_UTF16(val, GET_16BIT, ERROR)\ | ||
| 514 | val = (GET_16BIT);\ | ||
| 515 | {\ | ||
| 516 | unsigned int hi = val - 0xD800;\ | ||
| 517 | if (hi < 0x800) {\ | ||
| 518 | val = (GET_16BIT) - 0xDC00;\ | ||
| 519 | if (val > 0x3FFU || hi > 0x3FFU)\ | ||
| 520 | {ERROR}\ | ||
| 521 | val += (hi<<10) + 0x10000;\ | ||
| 522 | }\ | ||
| 523 | }\ | ||
| 524 | |||
| 525 | /** | ||
| 526 | * @def PUT_UTF8(val, tmp, PUT_BYTE) | ||
| 527 | * Convert a 32-bit Unicode character to its UTF-8 encoded form (up to 4 bytes long). | ||
| 528 | * @param val is an input-only argument and should be of type uint32_t. It holds | ||
| 529 | * a UCS-4 encoded Unicode character that is to be converted to UTF-8. If | ||
| 530 | * val is given as a function it is executed only once. | ||
| 531 | * @param tmp is a temporary variable and should be of type uint8_t. It | ||
| 532 | * represents an intermediate value during conversion that is to be | ||
| 533 | * output by PUT_BYTE. | ||
| 534 | * @param PUT_BYTE writes the converted UTF-8 bytes to any proper destination. | ||
| 535 | * It could be a function or a statement, and uses tmp as the input byte. | ||
| 536 | * For example, PUT_BYTE could be "*output++ = tmp;" PUT_BYTE will be | ||
| 537 | * executed up to 4 times for values in the valid UTF-8 range and up to | ||
| 538 | * 7 times in the general case, depending on the length of the converted | ||
| 539 | * Unicode character. | ||
| 540 | */ | ||
| 541 | #define PUT_UTF8(val, tmp, PUT_BYTE)\ | ||
| 542 | {\ | ||
| 543 | int bytes, shift;\ | ||
| 544 | uint32_t in = val;\ | ||
| 545 | if (in < 0x80) {\ | ||
| 546 | tmp = in;\ | ||
| 547 | PUT_BYTE\ | ||
| 548 | } else {\ | ||
| 549 | bytes = (av_log2(in) + 4) / 5;\ | ||
| 550 | shift = (bytes - 1) * 6;\ | ||
| 551 | tmp = (256 - (256 >> bytes)) | (in >> shift);\ | ||
| 552 | PUT_BYTE\ | ||
| 553 | while (shift >= 6) {\ | ||
| 554 | shift -= 6;\ | ||
| 555 | tmp = 0x80 | ((in >> shift) & 0x3f);\ | ||
| 556 | PUT_BYTE\ | ||
| 557 | }\ | ||
| 558 | }\ | ||
| 559 | } | ||
| 560 | |||
| 561 | /** | ||
| 562 | * @def PUT_UTF16(val, tmp, PUT_16BIT) | ||
| 563 | * Convert a 32-bit Unicode character to its UTF-16 encoded form (2 or 4 bytes). | ||
| 564 | * @param val is an input-only argument and should be of type uint32_t. It holds | ||
| 565 | * a UCS-4 encoded Unicode character that is to be converted to UTF-16. If | ||
| 566 | * val is given as a function it is executed only once. | ||
| 567 | * @param tmp is a temporary variable and should be of type uint16_t. It | ||
| 568 | * represents an intermediate value during conversion that is to be | ||
| 569 | * output by PUT_16BIT. | ||
| 570 | * @param PUT_16BIT writes the converted UTF-16 data to any proper destination | ||
| 571 | * in desired endianness. It could be a function or a statement, and uses tmp | ||
| 572 | * as the input byte. For example, PUT_BYTE could be "*output++ = tmp;" | ||
| 573 | * PUT_BYTE will be executed 1 or 2 times depending on input character. | ||
| 574 | */ | ||
| 575 | #define PUT_UTF16(val, tmp, PUT_16BIT)\ | ||
| 576 | {\ | ||
| 577 | uint32_t in = val;\ | ||
| 578 | if (in < 0x10000) {\ | ||
| 579 | tmp = in;\ | ||
| 580 | PUT_16BIT\ | ||
| 581 | } else {\ | ||
| 582 | tmp = 0xD800 | ((in - 0x10000) >> 10);\ | ||
| 583 | PUT_16BIT\ | ||
| 584 | tmp = 0xDC00 | ((in - 0x10000) & 0x3FF);\ | ||
| 585 | PUT_16BIT\ | ||
| 586 | }\ | ||
| 587 | }\ | ||
| 588 | |||
| 589 | #endif /* AVUTIL_COMMON_H */ | ||
| 590 |