| 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 | #include "put_bits.h" |
| 37 | |
| 38 | #define INVALID_VLC 0x80000000 |
| 39 | |
| 40 | extern const uint8_t ff_golomb_vlc_len[512]; |
| 41 | extern const uint8_t ff_ue_golomb_vlc_code[512]; |
| 42 | extern const int8_t ff_se_golomb_vlc_code[512]; |
| 43 | extern const uint8_t ff_ue_golomb_len[256]; |
| 44 | |
| 45 | extern const uint8_t ff_interleaved_golomb_vlc_len[256]; |
| 46 | extern const uint8_t ff_interleaved_ue_golomb_vlc_code[256]; |
| 47 | extern const int8_t ff_interleaved_se_golomb_vlc_code[256]; |
| 48 | extern const uint8_t ff_interleaved_dirac_golomb_vlc_code[256]; |
| 49 | |
| 50 | /** |
| 51 | * read unsigned exp golomb code. |
| 52 | */ |
| 53 | static inline int get_ue_golomb(GetBitContext *gb) |
| 54 | { |
| 55 | unsigned int buf; |
| 56 | |
| 57 | OPEN_READER(re, gb); |
| 58 | UPDATE_CACHE(re, gb); |
| 59 | buf = GET_CACHE(re, gb); |
| 60 | |
| 61 | if (buf >= (1 << 27)) { |
| 62 | buf >>= 32 - 9; |
| 63 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
| 64 | CLOSE_READER(re, gb); |
| 65 | |
| 66 | return ff_ue_golomb_vlc_code[buf]; |
| 67 | } else { |
| 68 | int log = 2 * av_log2(buf) - 31; |
| 69 | LAST_SKIP_BITS(re, gb, 32 - log); |
| 70 | CLOSE_READER(re, gb); |
| 71 | if (CONFIG_FTRAPV && log < 0) { |
| 72 | av_log(0, AV_LOG_ERROR, "Invalid UE golomb code\n"); |
| 73 | return AVERROR_INVALIDDATA; |
| 74 | } |
| 75 | buf >>= log; |
| 76 | buf--; |
| 77 | |
| 78 | return buf; |
| 79 | } |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Read an unsigned Exp-Golomb code in the range 0 to UINT32_MAX-1. |
| 84 | */ |
| 85 | static inline unsigned get_ue_golomb_long(GetBitContext *gb) |
| 86 | { |
| 87 | unsigned buf, log; |
| 88 | |
| 89 | buf = show_bits_long(gb, 32); |
| 90 | log = 31 - av_log2(buf); |
| 91 | skip_bits_long(gb, log); |
| 92 | |
| 93 | return get_bits_long(gb, log + 1) - 1; |
| 94 | } |
| 95 | |
| 96 | /** |
| 97 | * read unsigned exp golomb code, constraint to a max of 31. |
| 98 | * the return value is undefined if the stored value exceeds 31. |
| 99 | */ |
| 100 | static inline int get_ue_golomb_31(GetBitContext *gb) |
| 101 | { |
| 102 | unsigned int buf; |
| 103 | |
| 104 | OPEN_READER(re, gb); |
| 105 | UPDATE_CACHE(re, gb); |
| 106 | buf = GET_CACHE(re, gb); |
| 107 | |
| 108 | buf >>= 32 - 9; |
| 109 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
| 110 | CLOSE_READER(re, gb); |
| 111 | |
| 112 | return ff_ue_golomb_vlc_code[buf]; |
| 113 | } |
| 114 | |
| 115 | static inline unsigned svq3_get_ue_golomb(GetBitContext *gb) |
| 116 | { |
| 117 | uint32_t buf; |
| 118 | |
| 119 | OPEN_READER(re, gb); |
| 120 | UPDATE_CACHE(re, gb); |
| 121 | buf = GET_CACHE(re, gb); |
| 122 | |
| 123 | if (buf & 0xAA800000) { |
| 124 | buf >>= 32 - 8; |
| 125 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); |
| 126 | CLOSE_READER(re, gb); |
| 127 | |
| 128 | return ff_interleaved_ue_golomb_vlc_code[buf]; |
| 129 | } else { |
| 130 | unsigned ret = 1; |
| 131 | |
| 132 | do { |
| 133 | buf >>= 32 - 8; |
| 134 | LAST_SKIP_BITS(re, gb, |
| 135 | FFMIN(ff_interleaved_golomb_vlc_len[buf], 8)); |
| 136 | |
| 137 | if (ff_interleaved_golomb_vlc_len[buf] != 9) { |
| 138 | ret <<= (ff_interleaved_golomb_vlc_len[buf] - 1) >> 1; |
| 139 | ret |= ff_interleaved_dirac_golomb_vlc_code[buf]; |
| 140 | break; |
| 141 | } |
| 142 | ret = (ret << 4) | ff_interleaved_dirac_golomb_vlc_code[buf]; |
| 143 | UPDATE_CACHE(re, gb); |
| 144 | buf = GET_CACHE(re, gb); |
| 145 | } while (ret<0x8000000U && BITS_AVAILABLE(re, gb)); |
| 146 | |
| 147 | CLOSE_READER(re, gb); |
| 148 | return ret - 1; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * read unsigned truncated exp golomb code. |
| 154 | */ |
| 155 | static inline int get_te0_golomb(GetBitContext *gb, int range) |
| 156 | { |
| 157 | av_assert2(range >= 1); |
| 158 | |
| 159 | if (range == 1) |
| 160 | return 0; |
| 161 | else if (range == 2) |
| 162 | return get_bits1(gb) ^ 1; |
| 163 | else |
| 164 | return get_ue_golomb(gb); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * read unsigned truncated exp golomb code. |
| 169 | */ |
| 170 | static inline int get_te_golomb(GetBitContext *gb, int range) |
| 171 | { |
| 172 | av_assert2(range >= 1); |
| 173 | |
| 174 | if (range == 2) |
| 175 | return get_bits1(gb) ^ 1; |
| 176 | else |
| 177 | return get_ue_golomb(gb); |
| 178 | } |
| 179 | |
| 180 | /** |
| 181 | * read signed exp golomb code. |
| 182 | */ |
| 183 | static inline int get_se_golomb(GetBitContext *gb) |
| 184 | { |
| 185 | unsigned int buf; |
| 186 | |
| 187 | OPEN_READER(re, gb); |
| 188 | UPDATE_CACHE(re, gb); |
| 189 | buf = GET_CACHE(re, gb); |
| 190 | |
| 191 | if (buf >= (1 << 27)) { |
| 192 | buf >>= 32 - 9; |
| 193 | LAST_SKIP_BITS(re, gb, ff_golomb_vlc_len[buf]); |
| 194 | CLOSE_READER(re, gb); |
| 195 | |
| 196 | return ff_se_golomb_vlc_code[buf]; |
| 197 | } else { |
| 198 | int log = av_log2(buf); |
| 199 | LAST_SKIP_BITS(re, gb, 31 - log); |
| 200 | UPDATE_CACHE(re, gb); |
| 201 | buf = GET_CACHE(re, gb); |
| 202 | |
| 203 | buf >>= log; |
| 204 | |
| 205 | LAST_SKIP_BITS(re, gb, 32 - log); |
| 206 | CLOSE_READER(re, gb); |
| 207 | |
| 208 | if (buf & 1) |
| 209 | buf = -(buf >> 1); |
| 210 | else |
| 211 | buf = (buf >> 1); |
| 212 | |
| 213 | return buf; |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | static inline int get_se_golomb_long(GetBitContext *gb) |
| 218 | { |
| 219 | unsigned int buf = get_ue_golomb_long(gb); |
| 220 | |
| 221 | if (buf & 1) |
| 222 | buf = (buf + 1) >> 1; |
| 223 | else |
| 224 | buf = -(buf >> 1); |
| 225 | |
| 226 | return buf; |
| 227 | } |
| 228 | |
| 229 | static inline int svq3_get_se_golomb(GetBitContext *gb) |
| 230 | { |
| 231 | unsigned int buf; |
| 232 | |
| 233 | OPEN_READER(re, gb); |
| 234 | UPDATE_CACHE(re, gb); |
| 235 | buf = GET_CACHE(re, gb); |
| 236 | |
| 237 | if (buf & 0xAA800000) { |
| 238 | buf >>= 32 - 8; |
| 239 | LAST_SKIP_BITS(re, gb, ff_interleaved_golomb_vlc_len[buf]); |
| 240 | CLOSE_READER(re, gb); |
| 241 | |
| 242 | return ff_interleaved_se_golomb_vlc_code[buf]; |
| 243 | } else { |
| 244 | int log; |
| 245 | LAST_SKIP_BITS(re, gb, 8); |
| 246 | UPDATE_CACHE(re, gb); |
| 247 | buf |= 1 | (GET_CACHE(re, gb) >> 8); |
| 248 | |
| 249 | if ((buf & 0xAAAAAAAA) == 0) |
| 250 | return INVALID_VLC; |
| 251 | |
| 252 | for (log = 31; (buf & 0x80000000) == 0; log--) |
| 253 | buf = (buf << 2) - ((buf << log) >> (log - 1)) + (buf >> 30); |
| 254 | |
| 255 | LAST_SKIP_BITS(re, gb, 63 - 2 * log - 8); |
| 256 | CLOSE_READER(re, gb); |
| 257 | |
| 258 | return (signed) (((((buf << log) >> log) - 1) ^ -(buf & 0x1)) + 1) >> 1; |
| 259 | } |
| 260 | } |
| 261 | |
| 262 | static inline int dirac_get_se_golomb(GetBitContext *gb) |
| 263 | { |
| 264 | uint32_t ret = svq3_get_ue_golomb(gb); |
| 265 | |
| 266 | if (ret) { |
| 267 | uint32_t buf; |
| 268 | OPEN_READER(re, gb); |
| 269 | UPDATE_CACHE(re, gb); |
| 270 | buf = SHOW_SBITS(re, gb, 1); |
| 271 | LAST_SKIP_BITS(re, gb, 1); |
| 272 | ret = (ret ^ buf) - buf; |
| 273 | CLOSE_READER(re, gb); |
| 274 | } |
| 275 | |
| 276 | return ret; |
| 277 | } |
| 278 | |
| 279 | /** |
| 280 | * read unsigned golomb rice code (ffv1). |
| 281 | */ |
| 282 | static inline int get_ur_golomb(GetBitContext *gb, int k, int limit, |
| 283 | int esc_len) |
| 284 | { |
| 285 | unsigned int buf; |
| 286 | int log; |
| 287 | |
| 288 | OPEN_READER(re, gb); |
| 289 | UPDATE_CACHE(re, gb); |
| 290 | buf = GET_CACHE(re, gb); |
| 291 | |
| 292 | log = av_log2(buf); |
| 293 | |
| 294 | if (log > 31 - limit) { |
| 295 | buf >>= log - k; |
| 296 | buf += (30 - log) << k; |
| 297 | LAST_SKIP_BITS(re, gb, 32 + k - log); |
| 298 | CLOSE_READER(re, gb); |
| 299 | |
| 300 | return buf; |
| 301 | } else { |
| 302 | LAST_SKIP_BITS(re, gb, limit); |
| 303 | UPDATE_CACHE(re, gb); |
| 304 | |
| 305 | buf = SHOW_UBITS(re, gb, esc_len); |
| 306 | |
| 307 | LAST_SKIP_BITS(re, gb, esc_len); |
| 308 | CLOSE_READER(re, gb); |
| 309 | |
| 310 | return buf + limit - 1; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * read unsigned golomb rice code (jpegls). |
| 316 | */ |
| 317 | static inline int get_ur_golomb_jpegls(GetBitContext *gb, int k, int limit, |
| 318 | int esc_len) |
| 319 | { |
| 320 | unsigned int buf; |
| 321 | int log; |
| 322 | |
| 323 | OPEN_READER(re, gb); |
| 324 | UPDATE_CACHE(re, gb); |
| 325 | buf = GET_CACHE(re, gb); |
| 326 | |
| 327 | log = av_log2(buf); |
| 328 | |
| 329 | if (log - k >= 32 - MIN_CACHE_BITS + (MIN_CACHE_BITS == 32) && |
| 330 | 32 - log < limit) { |
| 331 | buf >>= log - k; |
| 332 | buf += (30 - log) << k; |
| 333 | LAST_SKIP_BITS(re, gb, 32 + k - log); |
| 334 | CLOSE_READER(re, gb); |
| 335 | |
| 336 | return buf; |
| 337 | } else { |
| 338 | int i; |
| 339 | for (i = 0; i < limit && SHOW_UBITS(re, gb, 1) == 0; i++) { |
| 340 | if (gb->size_in_bits <= re_index) |
| 341 | return -1; |
| 342 | LAST_SKIP_BITS(re, gb, 1); |
| 343 | UPDATE_CACHE(re, gb); |
| 344 | } |
| 345 | SKIP_BITS(re, gb, 1); |
| 346 | |
| 347 | if (i < limit - 1) { |
| 348 | if (k) { |
| 349 | buf = SHOW_UBITS(re, gb, k); |
| 350 | LAST_SKIP_BITS(re, gb, k); |
| 351 | } else { |
| 352 | buf = 0; |
| 353 | } |
| 354 | |
| 355 | CLOSE_READER(re, gb); |
| 356 | return buf + (i << k); |
| 357 | } else if (i == limit - 1) { |
| 358 | buf = SHOW_UBITS(re, gb, esc_len); |
| 359 | LAST_SKIP_BITS(re, gb, esc_len); |
| 360 | CLOSE_READER(re, gb); |
| 361 | |
| 362 | return buf + 1; |
| 363 | } else |
| 364 | return -1; |
| 365 | } |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * read signed golomb rice code (ffv1). |
| 370 | */ |
| 371 | static inline int get_sr_golomb(GetBitContext *gb, int k, int limit, |
| 372 | int esc_len) |
| 373 | { |
| 374 | int v = get_ur_golomb(gb, k, limit, esc_len); |
| 375 | |
| 376 | v++; |
| 377 | if (v & 1) |
| 378 | return v >> 1; |
| 379 | else |
| 380 | return -(v >> 1); |
| 381 | |
| 382 | // return (v>>1) ^ -(v&1); |
| 383 | } |
| 384 | |
| 385 | /** |
| 386 | * read signed golomb rice code (flac). |
| 387 | */ |
| 388 | static inline int get_sr_golomb_flac(GetBitContext *gb, int k, int limit, |
| 389 | int esc_len) |
| 390 | { |
| 391 | int v = get_ur_golomb_jpegls(gb, k, limit, esc_len); |
| 392 | return (v >> 1) ^ -(v & 1); |
| 393 | } |
| 394 | |
| 395 | /** |
| 396 | * read unsigned golomb rice code (shorten). |
| 397 | */ |
| 398 | static inline unsigned int get_ur_golomb_shorten(GetBitContext *gb, int k) |
| 399 | { |
| 400 | return get_ur_golomb_jpegls(gb, k, INT_MAX, 0); |
| 401 | } |
| 402 | |
| 403 | /** |
| 404 | * read signed golomb rice code (shorten). |
| 405 | */ |
| 406 | static inline int get_sr_golomb_shorten(GetBitContext *gb, int k) |
| 407 | { |
| 408 | int uvar = get_ur_golomb_jpegls(gb, k + 1, INT_MAX, 0); |
| 409 | if (uvar & 1) |
| 410 | return ~(uvar >> 1); |
| 411 | else |
| 412 | return uvar >> 1; |
| 413 | } |
| 414 | |
| 415 | #ifdef TRACE |
| 416 | |
| 417 | static inline int get_ue(GetBitContext *s, const char *file, const char *func, |
| 418 | int line) |
| 419 | { |
| 420 | int show = show_bits(s, 24); |
| 421 | int pos = get_bits_count(s); |
| 422 | int i = get_ue_golomb(s); |
| 423 | int len = get_bits_count(s) - pos; |
| 424 | int bits = show >> (24 - len); |
| 425 | |
| 426 | print_bin(bits, len); |
| 427 | |
| 428 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d ue @%5d in %s %s:%d\n", |
| 429 | bits, len, i, pos, file, func, line); |
| 430 | |
| 431 | return i; |
| 432 | } |
| 433 | |
| 434 | static inline int get_se(GetBitContext *s, const char *file, const char *func, |
| 435 | int line) |
| 436 | { |
| 437 | int show = show_bits(s, 24); |
| 438 | int pos = get_bits_count(s); |
| 439 | int i = get_se_golomb(s); |
| 440 | int len = get_bits_count(s) - pos; |
| 441 | int bits = show >> (24 - len); |
| 442 | |
| 443 | print_bin(bits, len); |
| 444 | |
| 445 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d se @%5d in %s %s:%d\n", |
| 446 | bits, len, i, pos, file, func, line); |
| 447 | |
| 448 | return i; |
| 449 | } |
| 450 | |
| 451 | static inline int get_te(GetBitContext *s, int r, char *file, const char *func, |
| 452 | int line) |
| 453 | { |
| 454 | int show = show_bits(s, 24); |
| 455 | int pos = get_bits_count(s); |
| 456 | int i = get_te0_golomb(s, r); |
| 457 | int len = get_bits_count(s) - pos; |
| 458 | int bits = show >> (24 - len); |
| 459 | |
| 460 | print_bin(bits, len); |
| 461 | |
| 462 | av_log(NULL, AV_LOG_DEBUG, "%5d %2d %3d te @%5d in %s %s:%d\n", |
| 463 | bits, len, i, pos, file, func, line); |
| 464 | |
| 465 | return i; |
| 466 | } |
| 467 | |
| 468 | #define get_ue_golomb(a) get_ue(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| 469 | #define get_se_golomb(a) get_se(a, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| 470 | #define get_te_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| 471 | #define get_te0_golomb(a, r) get_te(a, r, __FILE__, __PRETTY_FUNCTION__, __LINE__) |
| 472 | |
| 473 | #endif /* TRACE */ |
| 474 | |
| 475 | /** |
| 476 | * write unsigned exp golomb code. |
| 477 | */ |
| 478 | static inline void set_ue_golomb(PutBitContext *pb, int i) |
| 479 | { |
| 480 | av_assert2(i >= 0); |
| 481 | |
| 482 | #if 0 |
| 483 | if (i = 0) { |
| 484 | put_bits(pb, 1, 1); |
| 485 | return; |
| 486 | } |
| 487 | #endif |
| 488 | if (i < 256) |
| 489 | put_bits(pb, ff_ue_golomb_len[i], i + 1); |
| 490 | else { |
| 491 | int e = av_log2(i + 1); |
| 492 | put_bits(pb, 2 * e + 1, i + 1); |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * write truncated unsigned exp golomb code. |
| 498 | */ |
| 499 | static inline void set_te_golomb(PutBitContext *pb, int i, int range) |
| 500 | { |
| 501 | av_assert2(range >= 1); |
| 502 | av_assert2(i <= range); |
| 503 | |
| 504 | if (range == 2) |
| 505 | put_bits(pb, 1, i ^ 1); |
| 506 | else |
| 507 | set_ue_golomb(pb, i); |
| 508 | } |
| 509 | |
| 510 | /** |
| 511 | * write signed exp golomb code. 16 bits at most. |
| 512 | */ |
| 513 | static inline void set_se_golomb(PutBitContext *pb, int i) |
| 514 | { |
| 515 | #if 0 |
| 516 | if (i <= 0) |
| 517 | i = -2 * i; |
| 518 | else |
| 519 | i = 2 * i - 1; |
| 520 | #elif 1 |
| 521 | i = 2 * i - 1; |
| 522 | if (i < 0) |
| 523 | i ^= -1; //FIXME check if gcc does the right thing |
| 524 | #else |
| 525 | i = 2 * i - 1; |
| 526 | i ^= (i >> 31); |
| 527 | #endif |
| 528 | set_ue_golomb(pb, i); |
| 529 | } |
| 530 | |
| 531 | /** |
| 532 | * write unsigned golomb rice code (ffv1). |
| 533 | */ |
| 534 | static inline void set_ur_golomb(PutBitContext *pb, int i, int k, int limit, |
| 535 | int esc_len) |
| 536 | { |
| 537 | int e; |
| 538 | |
| 539 | av_assert2(i >= 0); |
| 540 | |
| 541 | e = i >> k; |
| 542 | if (e < limit) |
| 543 | put_bits(pb, e + k + 1, (1 << k) + (i & ((1 << k) - 1))); |
| 544 | else |
| 545 | put_bits(pb, limit + esc_len, i - limit + 1); |
| 546 | } |
| 547 | |
| 548 | /** |
| 549 | * write unsigned golomb rice code (jpegls). |
| 550 | */ |
| 551 | static inline void set_ur_golomb_jpegls(PutBitContext *pb, int i, int k, |
| 552 | int limit, int esc_len) |
| 553 | { |
| 554 | int e; |
| 555 | |
| 556 | av_assert2(i >= 0); |
| 557 | |
| 558 | e = (i >> k) + 1; |
| 559 | if (e < limit) { |
| 560 | while (e > 31) { |
| 561 | put_bits(pb, 31, 0); |
| 562 | e -= 31; |
| 563 | } |
| 564 | put_bits(pb, e, 1); |
| 565 | if (k) |
| 566 | put_sbits(pb, k, i); |
| 567 | } else { |
| 568 | while (limit > 31) { |
| 569 | put_bits(pb, 31, 0); |
| 570 | limit -= 31; |
| 571 | } |
| 572 | put_bits(pb, limit, 1); |
| 573 | put_bits(pb, esc_len, i - 1); |
| 574 | } |
| 575 | } |
| 576 | |
| 577 | /** |
| 578 | * write signed golomb rice code (ffv1). |
| 579 | */ |
| 580 | static inline void set_sr_golomb(PutBitContext *pb, int i, int k, int limit, |
| 581 | int esc_len) |
| 582 | { |
| 583 | int v; |
| 584 | |
| 585 | v = -2 * i - 1; |
| 586 | v ^= (v >> 31); |
| 587 | |
| 588 | set_ur_golomb(pb, v, k, limit, esc_len); |
| 589 | } |
| 590 | |
| 591 | /** |
| 592 | * write signed golomb rice code (flac). |
| 593 | */ |
| 594 | static inline void set_sr_golomb_flac(PutBitContext *pb, int i, int k, |
| 595 | int limit, int esc_len) |
| 596 | { |
| 597 | int v; |
| 598 | |
| 599 | v = -2 * i - 1; |
| 600 | v ^= (v >> 31); |
| 601 | |
| 602 | set_ur_golomb_jpegls(pb, v, k, limit, esc_len); |
| 603 | } |
| 604 | |
| 605 | #endif /* AVCODEC_GOLOMB_H */ |