| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * exp golomb vlc stuff | ||
| 3 | * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> | ||
| 4 | * Copyright (c) 2004 Alex Beregszaszi | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | /** | ||
| 24 | * @file | ||
| 25 | * @brief | ||
| 26 | * exp golomb vlc stuff | ||
| 27 | * @author Michael Niedermayer <michaelni@gmx.at> and Alex Beregszaszi | ||
| 28 | */ | ||
| 29 | |||
| 30 | #ifndef AVCODEC_GOLOMB_H | ||
| 31 | #define AVCODEC_GOLOMB_H | ||
| 32 | |||
| 33 | #include <stdint.h> | ||
| 34 | |||
| 35 | #include "get_bits.h" | ||
| 36 | |||
| 37 | #define INVALID_VLC 0x80000000 | ||
| 38 | |||
| 39 | extern const uint8_t ff_golomb_vlc_len[512]; | ||
| 40 | extern const uint8_t ff_ue_golomb_vlc_code[512]; | ||
| 41 | extern const int8_t ff_se_golomb_vlc_code[512]; | ||
| 42 | |||
| 43 | extern const uint8_t ff_interleaved_golomb_vlc_len[256]; | ||
| 44 | extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256]; | ||
| 45 | extern const int8_t ff_interleaved_se_golomb_vlc_code[256]; | ||
| 46 | extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; | ||
| 47 | |||
| 48 | /** | ||
| 49 | * Read an unsigned Exp-Golomb code in the range 0 to 8190. | ||
| 50 | * | ||
| 51 | * @returns the read value or a negative error code. | ||
| 52 | */ | ||
| 53 | 30769693 | static inline int get_ue_golomb(GetBitContext *gb) | |
| 54 | { | ||
| 55 | unsigned int buf; | ||
| 56 | |||
| 57 | #if CACHED_BITSTREAM_READER | ||
| 58 | buf = show_bits_long(gb, 32); | ||
| 59 | |||
| 60 | if (buf >= (1 << 27)) { | ||
| 61 | buf >>= 32 - 9; | ||
| 62 | skip_bits_long(gb, ff_golomb_vlc_len[buf]); | ||
| 63 | |||
| 64 | return ff_ue_golomb_vlc_code[buf]; | ||
| 65 | } else { | ||
| 66 | int log = 2 * av_log2(buf) - 31; | ||
| 67 | |||
| 68 | skip_bits_long(gb, 32 - log); | ||
| 69 | if (log < 7) | ||
| 70 | return AVERROR_INVALIDDATA; | ||
| 71 | buf >>= log; | ||
| 72 | buf--; | ||
| 73 | |||
| 74 | return buf; | ||
| 75 | } | ||
| 76 | #else | ||
| 77 | 30769693 | OPEN_READER(re, gb); | |
| 78 | 30769693 | UPDATE_CACHE(re, gb); | |
| 79 | 30769693 | buf = GET_CACHE(re, gb); | |
| 80 | |||
| 81 |
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30769693 | if (buf >= (1 << 27)) { |
| 82 | 29679269 | buf >>= 32 - 9; | |
| 83 | 29679269 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
| 84 | 29679269 | CLOSE_READER(re, gb); | |
| 85 | |||
| 86 | 29679269 | return ff_ue_golomb_vlc_code[buf]; | |
| 87 | } else { | ||
| 88 | 1090424 | int log = 2 * av_log2(buf) - 31; | |
| 89 | 1090424 | LAST_SKIP_BITS(re, gb, 32 - log); | |
| 90 | 1090424 | CLOSE_READER(re, gb); | |
| 91 |
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1090424 | if (log < 7) |
| 92 | 3 | return AVERROR_INVALIDDATA; | |
| 93 | 1090421 | buf >>= log; | |
| 94 | 1090421 | buf--; | |
| 95 | |||
| 96 | 1090421 | return buf; | |
| 97 | } | ||
| 98 | #endif | ||
| 99 | } | ||
| 100 | |||
| 101 | /** | ||
| 102 | * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1. | ||
| 103 | */ | ||
| 104 | 2827732 | static inline unsigned get_ue_golomb_long(GetBitContext *gb) | |
| 105 | { | ||
| 106 | unsigned buf, log; | ||
| 107 | |||
| 108 | 2827732 | buf = show_bits_long(gb, 32); | |
| 109 | 2827732 | log = 31 - av_log2(buf); | |
| 110 | 2827732 | skip_bits_long(gb, log); | |
| 111 | |||
| 112 | 2827732 | return get_bits_long(gb, log + 1) - 1; | |
| 113 | } | ||
| 114 | |||
| 115 | /** | ||
| 116 | * read unsigned exp golomb code, constraint to a max of 31. | ||
| 117 | * If the value encountered is not in 0..31, the return value | ||
| 118 | * is outside the range 0..30. | ||
| 119 | */ | ||
| 120 | 5590006 | static inline int get_ue_golomb_31(GetBitContext *gb) | |
| 121 | { | ||
| 122 | unsigned int buf; | ||
| 123 | |||
| 124 | #if CACHED_BITSTREAM_READER | ||
| 125 | buf = show_bits_long(gb, 32); | ||
| 126 | |||
| 127 | buf >>= 32 - 9; | ||
| 128 | skip_bits_long(gb, ff_golomb_vlc_len[buf]); | ||
| 129 | #else | ||
| 130 | |||
| 131 | 5590006 | OPEN_READER(re, gb); | |
| 132 | 5590006 | UPDATE_CACHE(re, gb); | |
| 133 | 5590006 | buf = GET_CACHE(re, gb); | |
| 134 | |||
| 135 | 5590006 | buf >>= 32 - 9; | |
| 136 | 5590006 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
| 137 | 5590006 | CLOSE_READER(re, gb); | |
| 138 | #endif | ||
| 139 | |||
| 140 | 5590006 | return ff_ue_golomb_vlc_code[buf]; | |
| 141 | } | ||
| 142 | |||
| 143 | 13660458 | static inline unsigned get_interleaved_ue_golomb(GetBitContext *gb) | |
| 144 | { | ||
| 145 | uint32_t buf; | ||
| 146 | |||
| 147 | #if CACHED_BITSTREAM_READER | ||
| 148 | buf = show_bits_long(gb, 32); | ||
| 149 | |||
| 150 | if (buf & 0xAA800000) { | ||
| 151 | buf >>= 32 - 8; | ||
| 152 | skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]); | ||
| 153 | |||
| 154 | return ff_interleaved_ue_golomb_vlc_code[buf]; | ||
| 155 | } else { | ||
| 156 | unsigned ret = 1; | ||
| 157 | |||
| 158 | do { | ||
| 159 | buf >>= 32 - 8; | ||
| 160 | skip_bits_long(gb, FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); | ||
| 161 | |||
| 162 | if (ff_interleaved_golomb_vlc_len[buf] != 9) { | ||
| 163 | ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; | ||
| 164 | ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; | ||
| 165 | break; | ||
| 166 | } | ||
| 167 | ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; | ||
| 168 | buf = show_bits_long(gb, 32); | ||
| 169 | } while (get_bits_left(gb) > 0); | ||
| 170 | |||
| 171 | return ret - 1; | ||
| 172 | } | ||
| 173 | #else | ||
| 174 | 13660458 | OPEN_READER(re, gb); | |
| 175 | 13660458 | UPDATE_CACHE(re, gb); | |
| 176 | 13660458 | buf = GET_CACHE(re, gb); | |
| 177 | |||
| 178 |
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13660458 | if (buf & 0xAA800000) { |
| 179 | 13492466 | buf >>= 32 - 8; | |
| 180 | 13492466 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); | |
| 181 | 13492466 | CLOSE_READER(re, gb); | |
| 182 | |||
| 183 | 13492466 | return ff_interleaved_ue_golomb_vlc_code[buf]; | |
| 184 | } else { | ||
| 185 | 167992 | unsigned ret = 1; | |
| 186 | |||
| 187 | do { | ||
| 188 | 340579 | buf >>= 32 - 8; | |
| 189 | 340579 | LAST_SKIP_BITS(re, gb, | |
| 190 | FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); | ||
| 191 | |||
| 192 |
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340579 | if (ff_interleaved_golomb_vlc_len[buf] != 9) { |
| 193 | 167992 | ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; | |
| 194 | 167992 | ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; | |
| 195 | 167992 | break; | |
| 196 | } | ||
| 197 | 172587 | ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; | |
| 198 | 172587 | UPDATE_CACHE(re, gb); | |
| 199 | 172587 | buf = GET_CACHE(re, gb); | |
| 200 |
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172587 | } while (ret<0x8000000U && BITS_AVAILABLE(re, gb)); |
| 201 | |||
| 202 | 167992 | CLOSE_READER(re, gb); | |
| 203 | 167992 | return ret - 1; | |
| 204 | } | ||
| 205 | #endif | ||
| 206 | } | ||
| 207 | |||
| 208 | /** | ||
| 209 | * read unsigned truncated exp golomb code. | ||
| 210 | */ | ||
| 211 | static inline int get_te0_golomb(GetBitContext *gb, int range) | ||
| 212 | { | ||
| 213 | av_assert2(range >= 1); | ||
| 214 | |||
| 215 | if (range == 1) | ||
| 216 | return 0; | ||
| 217 | else if (range == 2) | ||
| 218 | return get_bits1(gb) ^ 1; | ||
| 219 | else | ||
| 220 | return get_ue_golomb(gb); | ||
| 221 | } | ||
| 222 | |||
| 223 | /** | ||
| 224 | * read unsigned truncated exp golomb code. | ||
| 225 | */ | ||
| 226 | static inline int get_te_golomb(GetBitContext *gb, int range) | ||
| 227 | { | ||
| 228 | av_assert2(range >= 1); | ||
| 229 | |||
| 230 | if (range == 2) | ||
| 231 | return get_bits1(gb) ^ 1; | ||
| 232 | else | ||
| 233 | return get_ue_golomb(gb); | ||
| 234 | } | ||
| 235 | |||
| 236 | /** | ||
| 237 | * read signed exp golomb code. | ||
| 238 | */ | ||
| 239 | 16481419 | static inline int get_se_golomb(GetBitContext *gb) | |
| 240 | { | ||
| 241 | unsigned int buf; | ||
| 242 | |||
| 243 | #if CACHED_BITSTREAM_READER | ||
| 244 | buf = show_bits_long(gb, 32); | ||
| 245 | |||
| 246 | if (buf >= (1 << 27)) { | ||
| 247 | buf >>= 32 - 9; | ||
| 248 | skip_bits_long(gb, ff_golomb_vlc_len[buf]); | ||
| 249 | |||
| 250 | return ff_se_golomb_vlc_code[buf]; | ||
| 251 | } else { | ||
| 252 | int log = 2 * av_log2(buf) - 31; | ||
| 253 | buf >>= log; | ||
| 254 | |||
| 255 | skip_bits_long(gb, 32 - log); | ||
| 256 | |||
| 257 | if (buf & 1) | ||
| 258 | buf = -(buf >> 1); | ||
| 259 | else | ||
| 260 | buf = (buf >> 1); | ||
| 261 | |||
| 262 | return buf; | ||
| 263 | } | ||
| 264 | #else | ||
| 265 | 16481419 | OPEN_READER(re, gb); | |
| 266 | 16481419 | UPDATE_CACHE(re, gb); | |
| 267 | 16481419 | buf = GET_CACHE(re, gb); | |
| 268 | |||
| 269 |
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16481419 | if (buf >= (1 << 27)) { |
| 270 | 15758782 | buf >>= 32 - 9; | |
| 271 | 15758782 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); | |
| 272 | 15758782 | CLOSE_READER(re, gb); | |
| 273 | |||
| 274 | 15758782 | return ff_se_golomb_vlc_code[buf]; | |
| 275 | } else { | ||
| 276 | 722637 | int log = av_log2(buf), sign; | |
| 277 | 722637 | LAST_SKIP_BITS(re, gb, 31 - log); | |
| 278 | 722637 | UPDATE_CACHE(re, gb); | |
| 279 | 722637 | buf = GET_CACHE(re, gb); | |
| 280 | |||
| 281 | 722637 | buf >>= log; | |
| 282 | |||
| 283 | 722637 | LAST_SKIP_BITS(re, gb, 32 - log); | |
| 284 | 722637 | CLOSE_READER(re, gb); | |
| 285 | |||
| 286 | 722637 | sign = -(buf & 1); | |
| 287 | 722637 | buf = ((buf >> 1) ^ sign) - sign; | |
| 288 | |||
| 289 | 722637 | return buf; | |
| 290 | } | ||
| 291 | #endif | ||
| 292 | } | ||
| 293 | |||
| 294 | 394 | static inline int get_se_golomb_long(GetBitContext *gb) | |
| 295 | { | ||
| 296 | 394 | unsigned int buf = get_ue_golomb_long(gb); | |
| 297 | 394 | int sign = (buf & 1) - 1; | |
| 298 | 394 | return ((buf >> 1) ^ sign) + 1; | |
| 299 | } | ||
| 300 | |||
| 301 | 1319101 | static inline int get_interleaved_se_golomb(GetBitContext *gb) | |
| 302 | { | ||
| 303 | unsigned int buf; | ||
| 304 | |||
| 305 | #if CACHED_BITSTREAM_READER | ||
| 306 | buf = show_bits_long(gb, 32); | ||
| 307 | |||
| 308 | if (buf & 0xAA800000) { | ||
| 309 | buf >>= 32 - 8; | ||
| 310 | skip_bits_long(gb, ff_interleaved_golomb_vlc_len[buf]); | ||
| 311 | |||
| 312 | return ff_interleaved_se_golomb_vlc_code[buf]; | ||
| 313 | } else { | ||
| 314 | int log; | ||
| 315 | skip_bits(gb, 8); | ||
| 316 | buf |= 1 | show_bits(gb, 24); | ||
| 317 | |||
| 318 | if ((buf & 0xAAAAAAAA) == 0) | ||
| 319 | return INVALID_VLC; | ||
| 320 | |||
| 321 | for (log = 31; (buf & 0x80000000) == 0; log--) | ||
| 322 | buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); | ||
| 323 | |||
| 324 | skip_bits_long(gb, 63 - 2 * log - 8); | ||
| 325 | |||
| 326 | return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; | ||
| 327 | } | ||
| 328 | #else | ||
| 329 | 1319101 | OPEN_READER(re, gb); | |
| 330 | 1319101 | UPDATE_CACHE(re, gb); | |
| 331 | 1319101 | buf = GET_CACHE(re, gb); | |
| 332 | |||
| 333 |
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1319101 | if (buf & 0xAA800000) { |
| 334 | 1269571 | buf >>= 32 - 8; | |
| 335 | 1269571 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); | |
| 336 | 1269571 | CLOSE_READER(re, gb); | |
| 337 | |||
| 338 | 1269571 | return ff_interleaved_se_golomb_vlc_code[buf]; | |
| 339 | } else { | ||
| 340 | int log; | ||
| 341 | 49530 | LAST_SKIP_BITS(re, gb, 8); | |
| 342 | 49530 | UPDATE_CACHE(re, gb); | |
| 343 | 49530 | buf |= 1 | (GET_CACHE(re, gb) >> 8); | |
| 344 | |||
| 345 |
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49530 | if ((buf & 0xAAAAAAAA) == 0) |
| 346 | ✗ | return INVALID_VLC; | |
| 347 | |||
| 348 |
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329091 | for (log = 31; (buf & 0x80000000) == 0; log--) |
| 349 | 279561 | buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); | |
| 350 | |||
| 351 | 49530 | LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8); | |
| 352 | 49530 | CLOSE_READER(re, gb); | |
| 353 | |||
| 354 | 49530 | return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; | |
| 355 | } | ||
| 356 | #endif | ||
| 357 | } | ||
| 358 | |||
| 359 | 1949306 | static inline int dirac_get_se_golomb(GetBitContext *gb) | |
| 360 | { | ||
| 361 | 1949306 | uint32_t ret = get_interleaved_ue_golomb(gb); | |
| 362 | |||
| 363 |
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1949306 | if (ret) { |
| 364 | 336860 | int sign = -get_bits1(gb); | |
| 365 | 336860 | ret = (ret ^ sign) - sign; | |
| 366 | } | ||
| 367 | |||
| 368 | 1949306 | return ret; | |
| 369 | } | ||
| 370 | |||
| 371 | /** | ||
| 372 | * read unsigned golomb rice code (ffv1). | ||
| 373 | */ | ||
| 374 | 167385877 | static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, | |
| 375 | int esc_len) | ||
| 376 | { | ||
| 377 | unsigned int buf; | ||
| 378 | int log; | ||
| 379 | |||
| 380 | #if CACHED_BITSTREAM_READER | ||
| 381 | buf = show_bits_long(gb, 32); | ||
| 382 | |||
| 383 | log = av_log2(buf); | ||
| 384 | |||
| 385 | if (log > 31 - limit) { | ||
| 386 | buf >>= log - k; | ||
| 387 | buf += (30 - log) << k; | ||
| 388 | skip_bits_long(gb, 32 + k - log); | ||
| 389 | |||
| 390 | return buf; | ||
| 391 | } else { | ||
| 392 | skip_bits_long(gb, limit); | ||
| 393 | buf = get_bits_long(gb, esc_len); | ||
| 394 | |||
| 395 | return buf + limit - 1; | ||
| 396 | } | ||
| 397 | #else | ||
| 398 | 167385877 | OPEN_READER(re, gb); | |
| 399 | 167385877 | UPDATE_CACHE(re, gb); | |
| 400 | 167385877 | buf = GET_CACHE(re, gb); | |
| 401 | |||
| 402 | 167385877 | log = av_log2(buf); | |
| 403 | |||
| 404 |
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167385877 | if (log > 31 - limit) { |
| 405 | av_assert2(log >= k); | ||
| 406 | 166594185 | buf >>= log - k; | |
| 407 | 166594185 | buf += (30U - log) << k; | |
| 408 | 166594185 | LAST_SKIP_BITS(re, gb, 32 + k - log); | |
| 409 | 166594185 | CLOSE_READER(re, gb); | |
| 410 | |||
| 411 | 166594185 | return buf; | |
| 412 | } else { | ||
| 413 | 791692 | LAST_SKIP_BITS(re, gb, limit); | |
| 414 | 791692 | UPDATE_CACHE(re, gb); | |
| 415 | |||
| 416 | 791692 | buf = SHOW_UBITS(re, gb, esc_len); | |
| 417 | |||
| 418 | 791692 | LAST_SKIP_BITS(re, gb, esc_len); | |
| 419 | 791692 | CLOSE_READER(re, gb); | |
| 420 | |||
| 421 | 791692 | return buf + limit - 1; | |
| 422 | } | ||
| 423 | #endif | ||
| 424 | } | ||
| 425 | |||
| 426 | /** | ||
| 427 | * read unsigned golomb rice code (jpegls). | ||
| 428 | * | ||
| 429 | * @returns -1 on error | ||
| 430 | */ | ||
| 431 | 106593062 | static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, | |
| 432 | int esc_len) | ||
| 433 | { | ||
| 434 | unsigned int buf; | ||
| 435 | int log; | ||
| 436 | |||
| 437 | #if CACHED_BITSTREAM_READER | ||
| 438 | buf = show_bits_long(gb, 32); | ||
| 439 | |||
| 440 | log = av_log2(buf); | ||
| 441 | |||
| 442 | if (log - k >= 1 && 32 - log < limit) { | ||
| 443 | buf >>= log - k; | ||
| 444 | buf += (30 - log) << k; | ||
| 445 | skip_bits_long(gb, 32 + k - log); | ||
| 446 | |||
| 447 | return buf; | ||
| 448 | } else { | ||
| 449 | int i; | ||
| 450 | for (i = 0; | ||
| 451 | i < limit && get_bits1(gb) == 0 && get_bits_left(gb) > 0; | ||
| 452 | i++); | ||
| 453 | |||
| 454 | if (i < limit - 1) { | ||
| 455 | buf = get_bits_long(gb, k); | ||
| 456 | |||
| 457 | return buf + (i << k); | ||
| 458 | } else if (i == limit - 1) { | ||
| 459 | buf = get_bits_long(gb, esc_len); | ||
| 460 | |||
| 461 | return buf + 1; | ||
| 462 | } else | ||
| 463 | return -1; | ||
| 464 | } | ||
| 465 | #else | ||
| 466 | 106593062 | OPEN_READER(re, gb); | |
| 467 | 106593062 | UPDATE_CACHE(re, gb); | |
| 468 | 106593062 | buf = GET_CACHE(re, gb); | |
| 469 | |||
| 470 | 106593062 | log = av_log2(buf); | |
| 471 | |||
| 472 | av_assert2(k <= 31); | ||
| 473 | |||
| 474 |
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106593062 | if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && |
| 475 |
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106515400 | 32 - log < limit) { |
| 476 | 106473152 | buf >>= log - k; | |
| 477 | 106473152 | buf += (30U - log) << k; | |
| 478 | 106473152 | LAST_SKIP_BITS(re, gb, 32 + k - log); | |
| 479 | 106473152 | CLOSE_READER(re, gb); | |
| 480 | |||
| 481 | 106473152 | return buf; | |
| 482 | } else { | ||
| 483 | int i; | ||
| 484 |
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120429 | for (i = 0; i + MIN_CACHE_BITS <= limit && SHOW_UBITS(re, gb, MIN_CACHE_BITS) == 0; i += MIN_CACHE_BITS) { |
| 485 |
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520 | if (gb->size_in_bits <= re_index) { |
| 486 | 1 | CLOSE_READER(re, gb); | |
| 487 | 1 | return -1; | |
| 488 | } | ||
| 489 | 519 | LAST_SKIP_BITS(re, gb, MIN_CACHE_BITS); | |
| 490 | 519 | UPDATE_CACHE(re, gb); | |
| 491 | } | ||
| 492 |
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2231498 | for (; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { |
| 493 | 2111589 | SKIP_BITS(re, gb, 1); | |
| 494 | } | ||
| 495 | 119909 | LAST_SKIP_BITS(re, gb, 1); | |
| 496 | 119909 | UPDATE_CACHE(re, gb); | |
| 497 | |||
| 498 |
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119909 | if (i < limit - 1) { |
| 499 |
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31630 | if (k) { |
| 500 |
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31457 | if (k > MIN_CACHE_BITS - 1) { |
| 501 | 17215 | buf = SHOW_UBITS(re, gb, 16) << (k-16); | |
| 502 | 17215 | LAST_SKIP_BITS(re, gb, 16); | |
| 503 | 17215 | UPDATE_CACHE(re, gb); | |
| 504 | 17215 | buf |= SHOW_UBITS(re, gb, k-16); | |
| 505 | 17215 | LAST_SKIP_BITS(re, gb, k-16); | |
| 506 | } else { | ||
| 507 | 14242 | buf = SHOW_UBITS(re, gb, k); | |
| 508 | 14242 | LAST_SKIP_BITS(re, gb, k); | |
| 509 | } | ||
| 510 | } else { | ||
| 511 | 173 | buf = 0; | |
| 512 | } | ||
| 513 | |||
| 514 | 31630 | buf += ((SUINT)i << k); | |
| 515 |
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88279 | } else if (i == limit - 1) { |
| 516 | 88279 | buf = SHOW_UBITS(re, gb, esc_len); | |
| 517 | 88279 | LAST_SKIP_BITS(re, gb, esc_len); | |
| 518 | |||
| 519 | 88279 | buf ++; | |
| 520 | } else { | ||
| 521 | ✗ | buf = -1; | |
| 522 | } | ||
| 523 | 119909 | CLOSE_READER(re, gb); | |
| 524 | 119909 | return buf; | |
| 525 | } | ||
| 526 | #endif | ||
| 527 | } | ||
| 528 | |||
| 529 | /** | ||
| 530 | * read signed golomb rice code (ffv1). | ||
| 531 | */ | ||
| 532 | 167385877 | static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, | |
| 533 | int esc_len) | ||
| 534 | { | ||
| 535 | 167385877 | unsigned v = get_ur_golomb(gb, k, limit, esc_len); | |
| 536 | 167385877 | return (v >> 1) ^ -(v & 1); | |
| 537 | } | ||
| 538 | |||
| 539 | /** | ||
| 540 | * read signed golomb rice code (flac). | ||
| 541 | * | ||
| 542 | * @returns INT_MIN on error | ||
| 543 | */ | ||
| 544 | 57998762 | static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, | |
| 545 | int esc_len) | ||
| 546 | { | ||
| 547 | 57998762 | unsigned v = get_ur_golomb_jpegls(gb, k, limit, esc_len); | |
| 548 | 57998762 | return (v >> 1) ^ -(v & 1); | |
| 549 | } | ||
| 550 | |||
| 551 | /** | ||
| 552 | * read unsigned golomb rice code (shorten). | ||
| 553 | */ | ||
| 554 | 6320 | static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k) | |
| 555 | { | ||
| 556 | 6320 | return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); | |
| 557 | } | ||
| 558 | |||
| 559 | /** | ||
| 560 | * read signed golomb rice code (shorten). | ||
| 561 | */ | ||
| 562 | 793344 | static inline int get_sr_golomb_shorten(GetBitContext *gb, int k) | |
| 563 | { | ||
| 564 | 793344 | int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); | |
| 565 | 793344 | return (uvar >> 1) ^ -(uvar & 1); | |
| 566 | } | ||
| 567 | |||
| 568 | #ifdef TRACE | ||
| 569 | |||
| 570 | static inline int get_ue(GetBitContext *s, const char *file, const char *func, | ||
| 571 | int line) | ||
| 572 | { | ||
| 573 | int show = show_bits(s, 24); | ||
| 574 | int pos = get_bits_count(s); | ||
| 575 | int i = get_ue_golomb(s); | ||
| 576 | int len = get_bits_count(s) - pos; | ||
| 577 | int bits = show >> (24 - len); | ||
| 578 | |||
| 579 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", | ||
| 580 | bits, len, i, pos, file, func, line); | ||
| 581 | |||
| 582 | return i; | ||
| 583 | } | ||
| 584 | |||
| 585 | static inline int get_se(GetBitContext *s, const char *file, const char *func, | ||
| 586 | int line) | ||
| 587 | { | ||
| 588 | int show = show_bits(s, 24); | ||
| 589 | int pos = get_bits_count(s); | ||
| 590 | int i = get_se_golomb(s); | ||
| 591 | int len = get_bits_count(s) - pos; | ||
| 592 | int bits = show >> (24 - len); | ||
| 593 | |||
| 594 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", | ||
| 595 | bits, len, i, pos, file, func, line); | ||
| 596 | |||
| 597 | return i; | ||
| 598 | } | ||
| 599 | |||
| 600 | static inline int get_te(GetBitContext *s, int r, char *file, const char *func, | ||
| 601 | int line) | ||
| 602 | { | ||
| 603 | int show = show_bits(s, 24); | ||
| 604 | int pos = get_bits_count(s); | ||
| 605 | int i = get_te0_golomb(s, r); | ||
| 606 | int len = get_bits_count(s) - pos; | ||
| 607 | int bits = show >> (24 - len); | ||
| 608 | |||
| 609 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", | ||
| 610 | bits, len, i, pos, file, func, line); | ||
| 611 | |||
| 612 | return i; | ||
| 613 | } | ||
| 614 | |||
| 615 | #define get_ue_golomb(a) get_ue(a, __FILE__, __func__, __LINE__) | ||
| 616 | #define get_se_golomb(a) get_se(a, __FILE__, __func__, __LINE__) | ||
| 617 | #define get_te_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) | ||
| 618 | #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __func__, __LINE__) | ||
| 619 | |||
| 620 | #endif /* TRACE */ | ||
| 621 | #endif /* AVCODEC_GOLOMB_H */ | ||
| 622 |