mqc.c revision ee451cb395940862dad63c85adfe8f2fd55e864c
1/* 2 * The copyright in this software is being made available under the 2-clauses 3 * BSD License, included below. This software may be subject to other third 4 * party and contributor rights, including patent rights, and no such rights 5 * are granted under this license. 6 * 7 * Copyright (c) 2002-2014, Universite catholique de Louvain (UCL), Belgium 8 * Copyright (c) 2002-2014, Professor Benoit Macq 9 * Copyright (c) 2001-2003, David Janssens 10 * Copyright (c) 2002-2003, Yannick Verschueren 11 * Copyright (c) 2003-2007, Francois-Olivier Devaux 12 * Copyright (c) 2003-2014, Antonin Descampe 13 * Copyright (c) 2005, Herve Drolon, FreeImage Team 14 * Copyright (c) 2008, Jerome Fimes, Communications & Systemes <jerome.fimes@c-s.fr> 15 * All rights reserved. 16 * 17 * Redistribution and use in source and binary forms, with or without 18 * modification, are permitted provided that the following conditions 19 * are met: 20 * 1. Redistributions of source code must retain the above copyright 21 * notice, this list of conditions and the following disclaimer. 22 * 2. Redistributions in binary form must reproduce the above copyright 23 * notice, this list of conditions and the following disclaimer in the 24 * documentation and/or other materials provided with the distribution. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS' 27 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 30 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39#include "opj_includes.h" 40 41/** @defgroup MQC MQC - Implementation of an MQ-Coder */ 42/*@{*/ 43 44/** @name Local static functions */ 45/*@{*/ 46 47/** 48Output a byte, doing bit-stuffing if necessary. 49After a 0xff byte, the next byte must be smaller than 0x90. 50@param mqc MQC handle 51*/ 52static void opj_mqc_byteout(opj_mqc_t *mqc); 53/** 54Renormalize mqc->a and mqc->c while encoding, so that mqc->a stays between 0x8000 and 0x10000 55@param mqc MQC handle 56*/ 57static void opj_mqc_renorme(opj_mqc_t *mqc); 58/** 59Encode the most probable symbol 60@param mqc MQC handle 61*/ 62static void opj_mqc_codemps(opj_mqc_t *mqc); 63/** 64Encode the most least symbol 65@param mqc MQC handle 66*/ 67static void opj_mqc_codelps(opj_mqc_t *mqc); 68/** 69Fill mqc->c with 1's for flushing 70@param mqc MQC handle 71*/ 72static void opj_mqc_setbits(opj_mqc_t *mqc); 73/** 74FIXME DOC 75@param mqc MQC handle 76@return 77*/ 78static INLINE OPJ_INT32 opj_mqc_mpsexchange(opj_mqc_t *const mqc); 79/** 80FIXME DOC 81@param mqc MQC handle 82@return 83*/ 84static INLINE OPJ_INT32 opj_mqc_lpsexchange(opj_mqc_t *const mqc); 85/** 86Input a byte 87@param mqc MQC handle 88*/ 89static INLINE void opj_mqc_bytein(opj_mqc_t *const mqc); 90/** 91Renormalize mqc->a and mqc->c while decoding 92@param mqc MQC handle 93*/ 94static INLINE void opj_mqc_renormd(opj_mqc_t *const mqc); 95/*@}*/ 96 97/*@}*/ 98 99/* <summary> */ 100/* This array defines all the possible states for a context. */ 101/* </summary> */ 102static opj_mqc_state_t mqc_states[47 * 2] = { 103 {0x5601, 0, &mqc_states[2], &mqc_states[3]}, 104 {0x5601, 1, &mqc_states[3], &mqc_states[2]}, 105 {0x3401, 0, &mqc_states[4], &mqc_states[12]}, 106 {0x3401, 1, &mqc_states[5], &mqc_states[13]}, 107 {0x1801, 0, &mqc_states[6], &mqc_states[18]}, 108 {0x1801, 1, &mqc_states[7], &mqc_states[19]}, 109 {0x0ac1, 0, &mqc_states[8], &mqc_states[24]}, 110 {0x0ac1, 1, &mqc_states[9], &mqc_states[25]}, 111 {0x0521, 0, &mqc_states[10], &mqc_states[58]}, 112 {0x0521, 1, &mqc_states[11], &mqc_states[59]}, 113 {0x0221, 0, &mqc_states[76], &mqc_states[66]}, 114 {0x0221, 1, &mqc_states[77], &mqc_states[67]}, 115 {0x5601, 0, &mqc_states[14], &mqc_states[13]}, 116 {0x5601, 1, &mqc_states[15], &mqc_states[12]}, 117 {0x5401, 0, &mqc_states[16], &mqc_states[28]}, 118 {0x5401, 1, &mqc_states[17], &mqc_states[29]}, 119 {0x4801, 0, &mqc_states[18], &mqc_states[28]}, 120 {0x4801, 1, &mqc_states[19], &mqc_states[29]}, 121 {0x3801, 0, &mqc_states[20], &mqc_states[28]}, 122 {0x3801, 1, &mqc_states[21], &mqc_states[29]}, 123 {0x3001, 0, &mqc_states[22], &mqc_states[34]}, 124 {0x3001, 1, &mqc_states[23], &mqc_states[35]}, 125 {0x2401, 0, &mqc_states[24], &mqc_states[36]}, 126 {0x2401, 1, &mqc_states[25], &mqc_states[37]}, 127 {0x1c01, 0, &mqc_states[26], &mqc_states[40]}, 128 {0x1c01, 1, &mqc_states[27], &mqc_states[41]}, 129 {0x1601, 0, &mqc_states[58], &mqc_states[42]}, 130 {0x1601, 1, &mqc_states[59], &mqc_states[43]}, 131 {0x5601, 0, &mqc_states[30], &mqc_states[29]}, 132 {0x5601, 1, &mqc_states[31], &mqc_states[28]}, 133 {0x5401, 0, &mqc_states[32], &mqc_states[28]}, 134 {0x5401, 1, &mqc_states[33], &mqc_states[29]}, 135 {0x5101, 0, &mqc_states[34], &mqc_states[30]}, 136 {0x5101, 1, &mqc_states[35], &mqc_states[31]}, 137 {0x4801, 0, &mqc_states[36], &mqc_states[32]}, 138 {0x4801, 1, &mqc_states[37], &mqc_states[33]}, 139 {0x3801, 0, &mqc_states[38], &mqc_states[34]}, 140 {0x3801, 1, &mqc_states[39], &mqc_states[35]}, 141 {0x3401, 0, &mqc_states[40], &mqc_states[36]}, 142 {0x3401, 1, &mqc_states[41], &mqc_states[37]}, 143 {0x3001, 0, &mqc_states[42], &mqc_states[38]}, 144 {0x3001, 1, &mqc_states[43], &mqc_states[39]}, 145 {0x2801, 0, &mqc_states[44], &mqc_states[38]}, 146 {0x2801, 1, &mqc_states[45], &mqc_states[39]}, 147 {0x2401, 0, &mqc_states[46], &mqc_states[40]}, 148 {0x2401, 1, &mqc_states[47], &mqc_states[41]}, 149 {0x2201, 0, &mqc_states[48], &mqc_states[42]}, 150 {0x2201, 1, &mqc_states[49], &mqc_states[43]}, 151 {0x1c01, 0, &mqc_states[50], &mqc_states[44]}, 152 {0x1c01, 1, &mqc_states[51], &mqc_states[45]}, 153 {0x1801, 0, &mqc_states[52], &mqc_states[46]}, 154 {0x1801, 1, &mqc_states[53], &mqc_states[47]}, 155 {0x1601, 0, &mqc_states[54], &mqc_states[48]}, 156 {0x1601, 1, &mqc_states[55], &mqc_states[49]}, 157 {0x1401, 0, &mqc_states[56], &mqc_states[50]}, 158 {0x1401, 1, &mqc_states[57], &mqc_states[51]}, 159 {0x1201, 0, &mqc_states[58], &mqc_states[52]}, 160 {0x1201, 1, &mqc_states[59], &mqc_states[53]}, 161 {0x1101, 0, &mqc_states[60], &mqc_states[54]}, 162 {0x1101, 1, &mqc_states[61], &mqc_states[55]}, 163 {0x0ac1, 0, &mqc_states[62], &mqc_states[56]}, 164 {0x0ac1, 1, &mqc_states[63], &mqc_states[57]}, 165 {0x09c1, 0, &mqc_states[64], &mqc_states[58]}, 166 {0x09c1, 1, &mqc_states[65], &mqc_states[59]}, 167 {0x08a1, 0, &mqc_states[66], &mqc_states[60]}, 168 {0x08a1, 1, &mqc_states[67], &mqc_states[61]}, 169 {0x0521, 0, &mqc_states[68], &mqc_states[62]}, 170 {0x0521, 1, &mqc_states[69], &mqc_states[63]}, 171 {0x0441, 0, &mqc_states[70], &mqc_states[64]}, 172 {0x0441, 1, &mqc_states[71], &mqc_states[65]}, 173 {0x02a1, 0, &mqc_states[72], &mqc_states[66]}, 174 {0x02a1, 1, &mqc_states[73], &mqc_states[67]}, 175 {0x0221, 0, &mqc_states[74], &mqc_states[68]}, 176 {0x0221, 1, &mqc_states[75], &mqc_states[69]}, 177 {0x0141, 0, &mqc_states[76], &mqc_states[70]}, 178 {0x0141, 1, &mqc_states[77], &mqc_states[71]}, 179 {0x0111, 0, &mqc_states[78], &mqc_states[72]}, 180 {0x0111, 1, &mqc_states[79], &mqc_states[73]}, 181 {0x0085, 0, &mqc_states[80], &mqc_states[74]}, 182 {0x0085, 1, &mqc_states[81], &mqc_states[75]}, 183 {0x0049, 0, &mqc_states[82], &mqc_states[76]}, 184 {0x0049, 1, &mqc_states[83], &mqc_states[77]}, 185 {0x0025, 0, &mqc_states[84], &mqc_states[78]}, 186 {0x0025, 1, &mqc_states[85], &mqc_states[79]}, 187 {0x0015, 0, &mqc_states[86], &mqc_states[80]}, 188 {0x0015, 1, &mqc_states[87], &mqc_states[81]}, 189 {0x0009, 0, &mqc_states[88], &mqc_states[82]}, 190 {0x0009, 1, &mqc_states[89], &mqc_states[83]}, 191 {0x0005, 0, &mqc_states[90], &mqc_states[84]}, 192 {0x0005, 1, &mqc_states[91], &mqc_states[85]}, 193 {0x0001, 0, &mqc_states[90], &mqc_states[86]}, 194 {0x0001, 1, &mqc_states[91], &mqc_states[87]}, 195 {0x5601, 0, &mqc_states[92], &mqc_states[92]}, 196 {0x5601, 1, &mqc_states[93], &mqc_states[93]}, 197}; 198 199/* 200========================================================== 201 local functions 202========================================================== 203*/ 204 205void opj_mqc_byteout(opj_mqc_t *mqc) { 206 if (*mqc->bp == 0xff) { 207 mqc->bp++; 208 *mqc->bp = (OPJ_BYTE)(mqc->c >> 20); 209 mqc->c &= 0xfffff; 210 mqc->ct = 7; 211 } else { 212 if ((mqc->c & 0x8000000) == 0) { /* ((mqc->c&0x8000000)==0) CHANGE */ 213 mqc->bp++; 214 *mqc->bp = (OPJ_BYTE)(mqc->c >> 19); 215 mqc->c &= 0x7ffff; 216 mqc->ct = 8; 217 } else { 218 (*mqc->bp)++; 219 if (*mqc->bp == 0xff) { 220 mqc->c &= 0x7ffffff; 221 mqc->bp++; 222 *mqc->bp = (OPJ_BYTE)(mqc->c >> 20); 223 mqc->c &= 0xfffff; 224 mqc->ct = 7; 225 } else { 226 mqc->bp++; 227 *mqc->bp = (OPJ_BYTE)(mqc->c >> 19); 228 mqc->c &= 0x7ffff; 229 mqc->ct = 8; 230 } 231 } 232 } 233} 234 235void opj_mqc_renorme(opj_mqc_t *mqc) { 236 do { 237 mqc->a <<= 1; 238 mqc->c <<= 1; 239 mqc->ct--; 240 if (mqc->ct == 0) { 241 opj_mqc_byteout(mqc); 242 } 243 } while ((mqc->a & 0x8000) == 0); 244} 245 246void opj_mqc_codemps(opj_mqc_t *mqc) { 247 mqc->a -= (*mqc->curctx)->qeval; 248 if ((mqc->a & 0x8000) == 0) { 249 if (mqc->a < (*mqc->curctx)->qeval) { 250 mqc->a = (*mqc->curctx)->qeval; 251 } else { 252 mqc->c += (*mqc->curctx)->qeval; 253 } 254 *mqc->curctx = (*mqc->curctx)->nmps; 255 opj_mqc_renorme(mqc); 256 } else { 257 mqc->c += (*mqc->curctx)->qeval; 258 } 259} 260 261void opj_mqc_codelps(opj_mqc_t *mqc) { 262 mqc->a -= (*mqc->curctx)->qeval; 263 if (mqc->a < (*mqc->curctx)->qeval) { 264 mqc->c += (*mqc->curctx)->qeval; 265 } else { 266 mqc->a = (*mqc->curctx)->qeval; 267 } 268 *mqc->curctx = (*mqc->curctx)->nlps; 269 opj_mqc_renorme(mqc); 270} 271 272void opj_mqc_setbits(opj_mqc_t *mqc) { 273 OPJ_UINT32 tempc = mqc->c + mqc->a; 274 mqc->c |= 0xffff; 275 if (mqc->c >= tempc) { 276 mqc->c -= 0x8000; 277 } 278} 279 280static INLINE OPJ_INT32 opj_mqc_mpsexchange(opj_mqc_t *const mqc) { 281 OPJ_INT32 d; 282 if (mqc->a < (*mqc->curctx)->qeval) { 283 d = (OPJ_INT32)(1 - (*mqc->curctx)->mps); 284 *mqc->curctx = (*mqc->curctx)->nlps; 285 } else { 286 d = (OPJ_INT32)(*mqc->curctx)->mps; 287 *mqc->curctx = (*mqc->curctx)->nmps; 288 } 289 290 return d; 291} 292 293static INLINE OPJ_INT32 opj_mqc_lpsexchange(opj_mqc_t *const mqc) { 294 OPJ_INT32 d; 295 if (mqc->a < (*mqc->curctx)->qeval) { 296 mqc->a = (*mqc->curctx)->qeval; 297 d = (OPJ_INT32)(*mqc->curctx)->mps; 298 *mqc->curctx = (*mqc->curctx)->nmps; 299 } else { 300 mqc->a = (*mqc->curctx)->qeval; 301 d = (OPJ_INT32)(1 - (*mqc->curctx)->mps); 302 *mqc->curctx = (*mqc->curctx)->nlps; 303 } 304 305 return d; 306} 307 308#ifdef MQC_PERF_OPT 309static INLINE void opj_mqc_bytein(opj_mqc_t *const mqc) { 310 unsigned int i = *((unsigned int *) mqc->bp); 311 mqc->c += i & 0xffff00; 312 mqc->ct = i & 0x0f; 313 mqc->bp += (i >> 2) & 0x04; 314} 315#else 316static void opj_mqc_bytein(opj_mqc_t *const mqc) { 317 if (mqc->bp != mqc->end) { 318 OPJ_UINT32 c; 319 if (mqc->bp + 1 != mqc->end) { 320 c = *(mqc->bp + 1); 321 } else { 322 c = 0xff; 323 } 324 if (*mqc->bp == 0xff) { 325 if (c > 0x8f) { 326 mqc->c += 0xff00; 327 mqc->ct = 8; 328 } else { 329 mqc->bp++; 330 mqc->c += c << 9; 331 mqc->ct = 7; 332 } 333 } else { 334 mqc->bp++; 335 mqc->c += c << 8; 336 mqc->ct = 8; 337 } 338 } else { 339 mqc->c += 0xff00; 340 mqc->ct = 8; 341 } 342} 343#endif 344 345static INLINE void opj_mqc_renormd(opj_mqc_t *const mqc) { 346 do { 347 if (mqc->ct == 0) { 348 opj_mqc_bytein(mqc); 349 } 350 mqc->a <<= 1; 351 mqc->c <<= 1; 352 mqc->ct--; 353 } while (mqc->a < 0x8000); 354} 355 356/* 357========================================================== 358 MQ-Coder interface 359========================================================== 360*/ 361 362opj_mqc_t* opj_mqc_create(void) { 363 opj_mqc_t *mqc = (opj_mqc_t*)opj_malloc(sizeof(opj_mqc_t)); 364#ifdef MQC_PERF_OPT 365 mqc->buffer = NULL; 366#endif 367 return mqc; 368} 369 370void opj_mqc_destroy(opj_mqc_t *mqc) { 371 if(mqc) { 372#ifdef MQC_PERF_OPT 373 opj_free(mqc->buffer); 374#endif 375 opj_free(mqc); 376 } 377} 378 379OPJ_UINT32 opj_mqc_numbytes(opj_mqc_t *mqc) { 380 const ptrdiff_t diff = mqc->bp - mqc->start; 381#if 0 382 assert( diff <= 0xffffffff && diff >= 0 ); /* UINT32_MAX */ 383#endif 384 return (OPJ_UINT32)diff; 385} 386 387void opj_mqc_init_enc(opj_mqc_t *mqc, OPJ_BYTE *bp) { 388 /* TODO MSD: need to take a look to the v2 version */ 389 opj_mqc_setcurctx(mqc, 0); 390 mqc->a = 0x8000; 391 mqc->c = 0; 392 mqc->bp = bp - 1; 393 mqc->ct = 12; 394 if (*mqc->bp == 0xff) { 395 mqc->ct = 13; 396 } 397 mqc->start = bp; 398} 399 400void opj_mqc_encode(opj_mqc_t *mqc, OPJ_UINT32 d) { 401 if ((*mqc->curctx)->mps == d) { 402 opj_mqc_codemps(mqc); 403 } else { 404 opj_mqc_codelps(mqc); 405 } 406} 407 408void opj_mqc_flush(opj_mqc_t *mqc) { 409 opj_mqc_setbits(mqc); 410 mqc->c <<= mqc->ct; 411 opj_mqc_byteout(mqc); 412 mqc->c <<= mqc->ct; 413 opj_mqc_byteout(mqc); 414 415 if (*mqc->bp != 0xff) { 416 mqc->bp++; 417 } 418} 419 420void opj_mqc_bypass_init_enc(opj_mqc_t *mqc) { 421 mqc->c = 0; 422 mqc->ct = 8; 423 /*if (*mqc->bp == 0xff) { 424 mqc->ct = 7; 425 } */ 426} 427 428void opj_mqc_bypass_enc(opj_mqc_t *mqc, OPJ_UINT32 d) { 429 mqc->ct--; 430 mqc->c = mqc->c + (d << mqc->ct); 431 if (mqc->ct == 0) { 432 mqc->bp++; 433 *mqc->bp = (OPJ_BYTE)mqc->c; 434 mqc->ct = 8; 435 if (*mqc->bp == 0xff) { 436 mqc->ct = 7; 437 } 438 mqc->c = 0; 439 } 440} 441 442OPJ_UINT32 opj_mqc_bypass_flush_enc(opj_mqc_t *mqc) { 443 OPJ_BYTE bit_padding; 444 445 bit_padding = 0; 446 447 if (mqc->ct != 0) { 448 while (mqc->ct > 0) { 449 mqc->ct--; 450 mqc->c += (OPJ_UINT32)(bit_padding << mqc->ct); 451 bit_padding = (bit_padding + 1) & 0x01; 452 } 453 mqc->bp++; 454 *mqc->bp = (OPJ_BYTE)mqc->c; 455 mqc->ct = 8; 456 mqc->c = 0; 457 } 458 459 return 1; 460} 461 462void opj_mqc_reset_enc(opj_mqc_t *mqc) { 463 opj_mqc_resetstates(mqc); 464 opj_mqc_setstate(mqc, T1_CTXNO_UNI, 0, 46); 465 opj_mqc_setstate(mqc, T1_CTXNO_AGG, 0, 3); 466 opj_mqc_setstate(mqc, T1_CTXNO_ZC, 0, 4); 467} 468 469OPJ_UINT32 opj_mqc_restart_enc(opj_mqc_t *mqc) { 470 OPJ_UINT32 correction = 1; 471 472 /* <flush part> */ 473 OPJ_INT32 n = (OPJ_INT32)(27 - 15 - mqc->ct); 474 mqc->c <<= mqc->ct; 475 while (n > 0) { 476 opj_mqc_byteout(mqc); 477 n -= (OPJ_INT32)mqc->ct; 478 mqc->c <<= mqc->ct; 479 } 480 opj_mqc_byteout(mqc); 481 482 return correction; 483} 484 485void opj_mqc_restart_init_enc(opj_mqc_t *mqc) { 486 /* <Re-init part> */ 487 opj_mqc_setcurctx(mqc, 0); 488 mqc->a = 0x8000; 489 mqc->c = 0; 490 mqc->ct = 12; 491 mqc->bp--; 492 if (*mqc->bp == 0xff) { 493 mqc->ct = 13; 494 } 495} 496 497void opj_mqc_erterm_enc(opj_mqc_t *mqc) { 498 OPJ_INT32 k = (OPJ_INT32)(11 - mqc->ct + 1); 499 500 while (k > 0) { 501 mqc->c <<= mqc->ct; 502 mqc->ct = 0; 503 opj_mqc_byteout(mqc); 504 k -= (OPJ_INT32)mqc->ct; 505 } 506 507 if (*mqc->bp != 0xff) { 508 opj_mqc_byteout(mqc); 509 } 510} 511 512void opj_mqc_segmark_enc(opj_mqc_t *mqc) { 513 OPJ_UINT32 i; 514 opj_mqc_setcurctx(mqc, 18); 515 516 for (i = 1; i < 5; i++) { 517 opj_mqc_encode(mqc, i % 2); 518 } 519} 520 521OPJ_BOOL opj_mqc_init_dec(opj_mqc_t *mqc, OPJ_BYTE *bp, OPJ_UINT32 len) { 522 opj_mqc_setcurctx(mqc, 0); 523 mqc->start = bp; 524 mqc->end = bp + len; 525 mqc->bp = bp; 526 if (len==0) mqc->c = 0xff << 16; 527 else mqc->c = (OPJ_UINT32)(*mqc->bp << 16); 528 529#ifdef MQC_PERF_OPT /* TODO_MSD: check this option and put in experimental */ 530 { 531 OPJ_UINT32 c; 532 OPJ_UINT32 *ip; 533 OPJ_BYTE *end = mqc->end - 1; 534 void* new_buffer = opj_realloc(mqc->buffer, (len + 1) * sizeof(OPJ_UINT32)); 535 if (! new_buffer) { 536 opj_free(mqc->buffer); 537 mqc->buffer = NULL; 538 return OPJ_FALSE; 539 } 540 mqc->buffer = new_buffer; 541 542 ip = (OPJ_UINT32 *) mqc->buffer; 543 544 while (bp < end) { 545 c = *(bp + 1); 546 if (*bp == 0xff) { 547 if (c > 0x8f) { 548 break; 549 } else { 550 *ip = 0x00000017 | (c << 9); 551 } 552 } else { 553 *ip = 0x00000018 | (c << 8); 554 } 555 bp++; 556 ip++; 557 } 558 559 /* Handle last byte of data */ 560 c = 0xff; 561 if (*bp == 0xff) { 562 *ip = 0x0000ff18; 563 } else { 564 bp++; 565 *ip = 0x00000018 | (c << 8); 566 } 567 ip++; 568 569 *ip = 0x0000ff08; 570 mqc->bp = mqc->buffer; 571 } 572#endif 573 opj_mqc_bytein(mqc); 574 mqc->c <<= 7; 575 mqc->ct -= 7; 576 mqc->a = 0x8000; 577 return OPJ_TRUE; 578} 579 580OPJ_INT32 opj_mqc_decode(opj_mqc_t *const mqc) { 581 OPJ_INT32 d; 582 mqc->a -= (*mqc->curctx)->qeval; 583 if ((mqc->c >> 16) < (*mqc->curctx)->qeval) { 584 d = opj_mqc_lpsexchange(mqc); 585 opj_mqc_renormd(mqc); 586 } else { 587 mqc->c -= (*mqc->curctx)->qeval << 16; 588 if ((mqc->a & 0x8000) == 0) { 589 d = opj_mqc_mpsexchange(mqc); 590 opj_mqc_renormd(mqc); 591 } else { 592 d = (OPJ_INT32)(*mqc->curctx)->mps; 593 } 594 } 595 596 return d; 597} 598 599void opj_mqc_resetstates(opj_mqc_t *mqc) { 600 OPJ_UINT32 i; 601 for (i = 0; i < MQC_NUMCTXS; i++) { 602 mqc->ctxs[i] = mqc_states; 603 } 604} 605 606void opj_mqc_setstate(opj_mqc_t *mqc, OPJ_UINT32 ctxno, OPJ_UINT32 msb, OPJ_INT32 prob) { 607 mqc->ctxs[ctxno] = &mqc_states[msb + (OPJ_UINT32)(prob << 1)]; 608} 609 610 611