src/lib/openjp3d/t2.c

   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) 2001-2003, David Janssens
   8  * Copyright (c) 2002-2003, Yannick Verschueren
   9  * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
  10  * Copyright (c) 2005, Herve Drolon, FreeImage Team
  11  * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
  12  * All rights reserved.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions
  16  * are met:
  17  * 1. Redistributions of source code must retain the above copyright
  18  *    notice, this list of conditions and the following disclaimer.
  19  * 2. Redistributions in binary form must reproduce the above copyright
  20  *    notice, this list of conditions and the following disclaimer in the
  21  *    documentation and/or other materials provided with the distribution.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
  24  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  27  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  28  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  29  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  30  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  31  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  32  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  33  * POSSIBILITY OF SUCH DAMAGE.
  34  */
  35
  36 #include "opj_includes.h"
  37
  38 /** @defgroup T2 T2 - Implementation of a tier-2 coding */
  39 /*@{*/
  40
  41 /** @name Local static functions */
  42 /*@{*/
  43
  44 static void t2_putcommacode(opj_bio_t *bio, int n);
  45 static int t2_getcommacode(opj_bio_t *bio);
  46 /**
  47 Variable length code for signalling delta Zil (truncation point)
  48 @param bio Bit Input/Output component
  49 @param n delta Zil
  50 */
  51 static void t2_putnumpasses(opj_bio_t *bio, int n);
  52 static int t2_getnumpasses(opj_bio_t *bio);
  53 /**
  54 Encode a packet of a tile to a destination buffer
  55 @param tile Tile for which to write the packets
  56 @param tcp Tile coding parameters
  57 @param pi Packet identity
  58 @param dest Destination buffer
  59 @param len Length of the destination buffer
  60 @param volume_info Structure to create an index file
  61 @param tileno Number of the tile encoded
  62 @param cp Coding parameters
  63 @return Number of bytes encoded from the packet
  64 */
  65 static int t2_encode_packet(opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi, unsigned char *dest, int len, opj_volume_info_t *volume_info, int tileno, opj_cp_t *cp);
  66 /**
  67 Initialize the segment decoder
  68 @param seg Segment instance
  69 @param cblksty Codeblock style
  70 @param first Is first segment
  71 */
  72 static void t2_init_seg(opj_tcd_seg_t *seg, int cblksty, int first);
  73 /**
  74 Decode a packet of a tile from a source buffer
  75 @param t2 T2 handle
  76 @param src Source buffer
  77 @param len Length of the source buffer
  78 @param tile Tile for which to write the packets
  79 @param tcp Tile coding parameters
  80 @param pi Packet identity
  81 @return Number of bytes decoded from the packet
  82 */
  83 int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi);
  84
  85 /*@}*/
  86
  87 /*@}*/
  88
  89 /* ----------------------------------------------------------------------- */
  90
  91 /* #define RESTART 0x04 */
  92 static void t2_putcommacode(opj_bio_t *bio, int n) {
  93         while (--n >= 0) {
  94                 bio_write(bio, 1, 1);
  95         }
  96         bio_write(bio, 0, 1);
  97 }
  98
  99 static int t2_getcommacode(opj_bio_t *bio) {
 100         int n;
 101         for (n = 0; bio_read(bio, 1); n++) {
 102                 ;
 103         }
 104         return n;
 105 }
 106
 107 static void t2_putnumpasses(opj_bio_t *bio, int n) {
 108         if (n == 1) {
 109                 bio_write(bio, 0, 1);
 110         } else if (n == 2) {
 111                 bio_write(bio, 2, 2);
 112         } else if (n <= 5) {
 113                 bio_write(bio, 0xc | (n - 3), 4);
 114         } else if (n <= 36) {
 115                 bio_write(bio, 0x1e0 | (n - 6), 9);
 116         } else if (n <= 164) {
 117                 bio_write(bio, 0xff80 | (n - 37), 16);
 118         }
 119 }
 120
 121 static int t2_getnumpasses(opj_bio_t *bio) {
 122         int n;
 123         if (!bio_read(bio, 1))
 124                 return 1;
 125         if (!bio_read(bio, 1))
 126                 return 2;
 127         if ((n = bio_read(bio, 2)) != 3)
 128                 return (3 + n);
 129         if ((n = bio_read(bio, 5)) != 31)
 130                 return (6 + n);
 131         return (37 + bio_read(bio, 7));
 132 }
 133
 134 static int t2_encode_packet(opj_tcd_tile_t * tile, opj_tcp_t * tcp, opj_pi_iterator_t *pi, unsigned char *dest, int len, opj_volume_info_t * volume_info, int tileno, opj_cp_t *cp) {
 135         int bandno, cblkno;
 136         unsigned char *sop = 0, *eph = 0;
 137         unsigned char *c = dest;
 138
 139         int compno = pi->compno;        /* component value */
 140         int resno  = pi->resno;         /* resolution level value */
 141         int precno = pi->precno;        /* precinct value */
 142         int layno  = pi->layno;         /* quality layer value */
 143
 144         opj_tcd_tilecomp_t *tilec = &tile->comps[compno];
 145         opj_tcd_resolution_t *res = &tilec->resolutions[resno];
 146
 147         opj_bio_t *bio = NULL;  /* BIO component */
 148
 149         /* <SOP 0xff91> */
 150         if ((tcp->csty & J3D_CP_CSTY_SOP)) {
 151                 sop = (unsigned char *) opj_malloc(6 * sizeof(unsigned char));
 152                 sop[0] = 255;
 153                 sop[1] = 145;
 154                 sop[2] = 0;
 155                 sop[3] = 4;
 156                 sop[4] = (volume_info) ? (volume_info->num % 65536) / 256 : (0 % 65536) / 256 ;
 157                 sop[5] = (volume_info) ? (volume_info->num % 65536) % 256 : (0 % 65536) % 256 ;
 158                 memcpy(c, sop, 6);
 159                 opj_free(sop);
 160                 c += 6;
 161         }
 162         /* </SOP> */
 163
 164         if (!layno) {
 165                 for (bandno = 0; bandno < res->numbands; bandno++) {
 166                         opj_tcd_band_t *band = &res->bands[bandno];
 167                         opj_tcd_precinct_t *prc = &band->precincts[precno];
 168                         tgt_reset(prc->incltree);
 169                         tgt_reset(prc->imsbtree);
 170                         for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 171                                 opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 172                                 cblk->numpasses = 0;
 173                 tgt_setvalue(prc->imsbtree, cblkno, band->numbps - cblk->numbps);
 174                         }
 175                 }
 176         }
 177
 178         bio = bio_create();
 179         bio_init_enc(bio, c, len);
 180         bio_write(bio, 1, 1);           /* Empty header bit */
 181
 182         /* Writing Packet header */
 183         for (bandno = 0; bandno < res->numbands; bandno++) {
 184                 opj_tcd_band_t *band = &res->bands[bandno];
 185                 opj_tcd_precinct_t *prc = &band->precincts[precno];
 186                 for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 187                         opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 188                         opj_tcd_layer_t *layer = &cblk->layers[layno];
 189                         if (!cblk->numpasses && layer->numpasses) {
 190                 tgt_setvalue(prc->incltree, cblkno, layno);
 191                         }
 192                 }
 193
 194                 for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 195                         opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 196                         opj_tcd_layer_t *layer = &cblk->layers[layno];
 197                         int increment = 0;
 198                         int nump = 0;
 199                         int len = 0, passno;
 200                         /* cblk inclusion bits */
 201                         if (!cblk->numpasses) {
 202                                 tgt_encode(bio, prc->incltree, cblkno, layno + 1);
 203                         } else {
 204                                 bio_write(bio, layer->numpasses != 0, 1);
 205                         }
 206                         /* if cblk not included, go to the next cblk  */
 207                         if (!layer->numpasses) {
 208                                 continue;
 209                         }
 210                         /* if first instance of cblk --> zero bit-planes information */
 211                         if (!cblk->numpasses) {
 212                                 cblk->numlenbits = 3;
 213                                 tgt_encode(bio, prc->imsbtree, cblkno, 999);
 214                         }
 215                         /* number of coding passes included */
 216                         t2_putnumpasses(bio, layer->numpasses);
 217
 218                         /* computation of the increase of the length indicator and insertion in the header     */
 219                         for (passno = cblk->numpasses; passno < cblk->numpasses + layer->numpasses; passno++) {
 220                                 opj_tcd_pass_t *pass = &cblk->passes[passno];
 221                                 nump++;
 222                                 len += pass->len;
 223                                 if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
 224                                         increment = int_max(increment, int_floorlog2(len) + 1 - (cblk->numlenbits + int_floorlog2(nump)));
 225                                         len = 0;
 226                                         nump = 0;
 227                                 }
 228                         }
 229                         t2_putcommacode(bio, increment);
 230
 231                         /* computation of the new Length indicator */
 232                         cblk->numlenbits += increment;
 233
 234                         /* insertion of the codeword segment length */
 235                         for (passno = cblk->numpasses; passno < cblk->numpasses + layer->numpasses; passno++) {
 236                                 opj_tcd_pass_t *pass = &cblk->passes[passno];
 237                                 nump++;
 238                                 len += pass->len;
 239                                 if (pass->term || passno == (cblk->numpasses + layer->numpasses) - 1) {
 240                                         bio_write(bio, len, cblk->numlenbits + int_floorlog2(nump));
 241                                         len = 0;
 242                                         nump = 0;
 243                                 }
 244                         }
 245
 246                 }
 247         }
 248
 249
 250         if (bio_flush(bio)) {
 251                 return -999;            /* modified to eliminate longjmp !! */
 252         }
 253
 254         c += bio_numbytes(bio);
 255
 256         bio_destroy(bio);
 257
 258         /* <EPH 0xff92> */
 259         if (tcp->csty & J3D_CP_CSTY_EPH) {
 260                 eph = (unsigned char *) opj_malloc(2 * sizeof(unsigned char));
 261                 eph[0] = 255;
 262                 eph[1] = 146;
 263                 memcpy(c, eph, 2);
 264                 opj_free(eph);
 265                 c += 2;
 266         }
 267         /* </EPH> */
 268
 269         /* Writing the packet body */
 270
 271         for (bandno = 0; bandno < res->numbands; bandno++) {
 272                 opj_tcd_band_t *band = &res->bands[bandno];
 273                 opj_tcd_precinct_t *prc = &band->precincts[precno];
 274                 for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 275                         opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 276                         opj_tcd_layer_t *layer = &cblk->layers[layno];
 277                         if (!layer->numpasses) {
 278                                 continue;
 279                         }
 280                         if (c + layer->len > dest + len) {
 281                                 return -999;
 282                         }
 283
 284                         memcpy(c, layer->data, layer->len);
 285                         cblk->numpasses += layer->numpasses;
 286                         c += layer->len;
 287                         /* ADD for index Cfr. Marcela --> delta disto by packet */
 288                         if(volume_info && volume_info->index_write && volume_info->index_on) {
 289                                 opj_tile_info_t *info_TL = &volume_info->tile[tileno];
 290                                 opj_packet_info_t *info_PK = &info_TL->packet[volume_info->num];
 291                                 info_PK->disto += layer->disto;
 292                                 if (volume_info->D_max < info_PK->disto) {
 293                                         volume_info->D_max = info_PK->disto;
 294                                 }
 295                         }
 296                         /* </ADD> */
 297                 }
 298         }
 299
 300         return (c - dest);
 301 }
 302
 303 static void t2_init_seg(opj_tcd_seg_t * seg, int cblksty, int first) {
 304         seg->numpasses = 0;
 305         seg->len = 0;
 306         if (cblksty & J3D_CCP_CBLKSTY_TERMALL) {
 307                 seg->maxpasses = 1;
 308         }
 309         else if (cblksty & J3D_CCP_CBLKSTY_LAZY) {
 310                 if (first) {
 311                         seg->maxpasses = 10;
 312                 } else {
 313                         seg->maxpasses = (((seg - 1)->maxpasses == 1) || ((seg - 1)->maxpasses == 10)) ? 2 : 1;
 314                 }
 315         } else {
 316                 seg->maxpasses = 109;
 317         }
 318 }
 319
 320 int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi) {
 321         int bandno, cblkno;
 322         unsigned char *c = src;
 323
 324         opj_cp_t *cp = t2->cp;
 325
 326         int compno = pi->compno;        /* component value */
 327         int resno  = pi->resno;         /* resolution level value */
 328         int precno = pi->precno;        /* precinct value */
 329         int layno  = pi->layno;         /* quality layer value */
 330
 331         opj_tcd_tilecomp_t *tilec = &tile->comps[compno];
 332         opj_tcd_resolution_t *res = &tilec->resolutions[resno];
 333
 334         unsigned char *hd = NULL;
 335         int present;
 336
 337         opj_bio_t *bio = NULL;  /* BIO component */
 338
 339         if (layno == 0) {
 340                 for (bandno = 0; bandno < res->numbands; bandno++) {
 341                         opj_tcd_band_t *band = &res->bands[bandno];
 342                         opj_tcd_precinct_t *prc = &band->precincts[precno];
 343
 344                         if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)||(band->z1-band->z0 == 0)) continue;
 345
 346                         tgt_reset(prc->incltree);
 347                         tgt_reset(prc->imsbtree);
 348                         for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 349                                 opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 350                                 cblk->numsegs = 0;
 351                         }
 352                 }
 353         }
 354
 355         /* SOP markers */
 356
 357         if (tcp->csty & J3D_CP_CSTY_SOP) {
 358                 if ((*c) != 0xff || (*(c + 1) != 0x91)) {
 359                         opj_event_msg(t2->cinfo, EVT_WARNING, "Expected SOP marker\n");
 360                 } else {
 361                         c += 6;
 362                 }
 363
 364                 /** TODO : check the Nsop value */
 365         }
 366
 367         /*
 368         When the marker PPT/PPM is used the packet header are store in PPT/PPM marker
 369         This part deal with this caracteristic
 370         step 1: Read packet header in the saved structure
 371         step 2: Return to codestream for decoding
 372         */
 373
 374         bio = bio_create();
 375
 376         if (cp->ppm == 1) {             /* PPM */
 377                 hd = cp->ppm_data;
 378                 bio_init_dec(bio, hd, cp->ppm_len);
 379         } else if (tcp->ppt == 1) {     /* PPT */
 380                 hd = tcp->ppt_data;
 381                 bio_init_dec(bio, hd, tcp->ppt_len);
 382         } else {                        /* Normal Case */
 383                 hd = c;
 384                 bio_init_dec(bio, hd, src+len-hd);
 385         }
 386
 387         present = bio_read(bio, 1);
 388
 389         if (!present) {
 390                 bio_inalign(bio);
 391                 hd += bio_numbytes(bio);
 392                 bio_destroy(bio);
 393
 394                 /* EPH markers */
 395
 396                 if (tcp->csty & J3D_CP_CSTY_EPH) {
 397                         if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
 398                                 printf("Error : expected EPH marker\n");
 399                         } else {
 400                                 hd += 2;
 401                         }
 402                 }
 403
 404                 if (cp->ppm == 1) {             /* PPM case */
 405                         cp->ppm_len += cp->ppm_data-hd;
 406                         cp->ppm_data = hd;
 407                         return (c - src);
 408                 }
 409                 if (tcp->ppt == 1) {    /* PPT case */
 410                         tcp->ppt_len+=tcp->ppt_data-hd;
 411                         tcp->ppt_data = hd;
 412                         return (c - src);
 413                 }
 414
 415                 return (hd - src);
 416         }
 417
 418         for (bandno = 0; bandno < res->numbands; bandno++) {
 419                 opj_tcd_band_t *band = &res->bands[bandno];
 420                 opj_tcd_precinct_t *prc = &band->precincts[precno];
 421
 422                 if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)||(band->z1-band->z0 == 0)) continue;
 423
 424                 for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 425                         int included, increment, n;
 426                         opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 427                         opj_tcd_seg_t *seg = NULL;
 428                         /* if cblk not yet included before --> inclusion tagtree */
 429                         if (!cblk->numsegs) {
 430                 included = tgt_decode(bio, prc->incltree, cblkno, layno + 1);
 431                                 /* else one bit */
 432                         } else {
 433                                 included = bio_read(bio, 1);
 434                         }
 435                         /* if cblk not included */
 436                         if (!included) {
 437                                 cblk->numnewpasses = 0;
 438                                 continue;
 439                         }
 440                         /* if cblk not yet included --> zero-bitplane tagtree */
 441                         if (!cblk->numsegs) {
 442                                 int i, numimsbs;
 443                                 for (i = 0; !tgt_decode(bio, prc->imsbtree, cblkno, i); i++);
 444                                 numimsbs = i - 1;
 445                                 cblk->numbps = band->numbps - numimsbs;
 446                                 cblk->numlenbits = 3;
 447                         }
 448                         /* number of coding passes */
 449                         cblk->numnewpasses = t2_getnumpasses(bio);
 450                         increment = t2_getcommacode(bio);
 451                         /* length indicator increment */
 452                         cblk->numlenbits += increment;
 453                         if (!cblk->numsegs) {
 454                                 seg = &cblk->segs[0];
 455                                 t2_init_seg(seg, tcp->tccps[compno].cblksty, 1);
 456                         } else {
 457                                 seg = &cblk->segs[cblk->numsegs - 1];
 458                                 if (seg->numpasses == seg->maxpasses) {
 459                                         t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
 460                                 }
 461                         }
 462                         n = cblk->numnewpasses;
 463
 464                         do {
 465                                 seg->numnewpasses = int_min(seg->maxpasses - seg->numpasses, n);
 466                                 seg->newlen = bio_read(bio, cblk->numlenbits + int_floorlog2(seg->numnewpasses));
 467                                 n -= seg->numnewpasses;
 468                                 if (n > 0) {
 469                                         t2_init_seg(++seg, tcp->tccps[compno].cblksty, 0);
 470                                 }
 471                         } while (n > 0);
 472                 }
 473         }
 474
 475         if (bio_inalign(bio)) {
 476                 bio_destroy(bio);
 477                 return -999;
 478         }
 479
 480         hd += bio_numbytes(bio);
 481         bio_destroy(bio);
 482
 483         /* EPH markers */
 484         if (tcp->csty & J3D_CP_CSTY_EPH) {
 485                 if ((*hd) != 0xff || (*(hd + 1) != 0x92)) {
 486                         opj_event_msg(t2->cinfo, EVT_ERROR, "Expected EPH marker\n");
 487                         return -999;
 488                 } else {
 489                         hd += 2;
 490                 }
 491         }
 492
 493         if (cp->ppm==1) {
 494                 cp->ppm_len+=cp->ppm_data-hd;
 495                 cp->ppm_data = hd;
 496         } else if (tcp->ppt == 1) {
 497                 tcp->ppt_len+=tcp->ppt_data-hd;
 498                 tcp->ppt_data = hd;
 499         } else {
 500                 c=hd;
 501         }
 502
 503         for (bandno = 0; bandno < res->numbands; bandno++) {
 504                 opj_tcd_band_t *band = &res->bands[bandno];
 505                 opj_tcd_precinct_t *prc = &band->precincts[precno];
 506
 507                 if ((band->x1-band->x0 == 0)||(band->y1-band->y0 == 0)||(band->z1-band->z0 == 0)) continue;
 508
 509                 for (cblkno = 0; cblkno < prc->cblkno[0] * prc->cblkno[1] * prc->cblkno[2]; cblkno++) {
 510                         opj_tcd_cblk_t *cblk = &prc->cblks[cblkno];
 511                         opj_tcd_seg_t *seg = NULL;
 512                         if (!cblk->numnewpasses)
 513                                 continue;
 514                         if (!cblk->numsegs) {
 515                                 seg = &cblk->segs[0];
 516                                 cblk->numsegs++;
 517                                 cblk->len = 0;
 518                         } else {
 519                                 seg = &cblk->segs[cblk->numsegs - 1];
 520                                 if (seg->numpasses == seg->maxpasses) {
 521                                         seg++;
 522                                         cblk->numsegs++;
 523                                 }
 524                         }
 525
 526                         do {
 527                                 if (c + seg->newlen > src + len) {
 528                                         return -999;
 529                                 }
 530
 531                                 memcpy(cblk->data + cblk->len, c, seg->newlen);
 532                                 if (seg->numpasses == 0) {
 533                                         seg->data = cblk->data + cblk->len;
 534                                 }
 535                                 c += seg->newlen;
 536                                 cblk->len += seg->newlen;
 537                                 seg->len += seg->newlen;
 538                                 seg->numpasses += seg->numnewpasses;
 539                                 cblk->numnewpasses -= seg->numnewpasses;
 540                                 if (cblk->numnewpasses > 0) {
 541                                         seg++;
 542                                         cblk->numsegs++;
 543                                 }
 544                         } while (cblk->numnewpasses > 0);
 545                 }
 546         }
 547
 548         return (c - src);
 549 }
 550
 551 /* ----------------------------------------------------------------------- */
 552
 553 int t2_encode_packets(opj_t2_t* t2, int tileno, opj_tcd_tile_t *tile, int maxlayers, unsigned char *dest, int len, opj_volume_info_t *volume_info) {
 554         unsigned char *c = dest;
 555         int e = 0;
 556         opj_pi_iterator_t *pi = NULL;
 557         int pino;
 558
 559         opj_volume_t *volume = t2->volume;
 560         opj_cp_t *cp = t2->cp;
 561
 562         /* create a packet iterator */
 563         pi = pi_create(volume, cp, tileno);
 564         if(!pi) {
 565                 fprintf(stdout,"[ERROR] Failed to create a pi structure\n");
 566                 return -999;
 567         }
 568
 569         if(volume_info) {
 570                 volume_info->num = 0;
 571         }
 572
 573         for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
 574                 while (pi_next(&pi[pino])) {
 575                         if (pi[pino].layno < maxlayers) {
 576                                 e = t2_encode_packet(tile, &cp->tcps[tileno], &pi[pino], c, dest + len - c, volume_info, tileno, cp);
 577                                 /*opj_event_msg(t2->cinfo, EVT_INFO, "  t2_encode_packet: %d bytes coded\n",e);*/
 578                                 if (e == -999) {
 579                                         break;
 580                                 } else {
 581                                         c += e;
 582                                 }
 583
 584                                 /* INDEX >> */
 585                                 if(volume_info && volume_info->index_on) {
 586                                         if(volume_info->index_write) {
 587                                                 opj_tile_info_t *info_TL = &volume_info->tile[tileno];
 588                                                 opj_packet_info_t *info_PK = &info_TL->packet[volume_info->num];
 589                                                 if (!volume_info->num) {
 590                                                         info_PK->start_pos = info_TL->end_header + 1;
 591                                                 } else {
 592                                                         info_PK->start_pos = info_TL->packet[volume_info->num - 1].end_pos + 1;
 593                                                 }
 594                                                 info_PK->end_pos = info_PK->start_pos + e - 1;
 595                                         }
 596
 597                                         volume_info->num++;
 598                                 }
 599                                 /* << INDEX */
 600                         }
 601                 }
 602         }
 603
 604         /* don't forget to release pi */
 605         pi_destroy(pi, cp, tileno);
 606
 607         if (e == -999) {
 608                 return e;
 609         }
 610
 611     return (c - dest);
 612 }
 613
 614 int t2_decode_packets(opj_t2_t *t2, unsigned char *src, int len, int tileno, opj_tcd_tile_t *tile) {
 615         unsigned char *c = src;
 616         opj_pi_iterator_t *pi;
 617         int pino, e = 0;
 618         int n = 0,i;
 619
 620         opj_volume_t *volume = t2->volume;
 621         opj_cp_t *cp = t2->cp;
 622
 623         /* create a packet iterator */
 624         pi = pi_create(volume, cp, tileno);
 625         if(!pi) {
 626                 /* TODO: throw an error */
 627                 return -999;
 628         }
 629
 630         for (pino = 0; pino <= cp->tcps[tileno].numpocs; pino++) {
 631                 while (pi_next(&pi[pino])) {
 632                         if ((cp->layer==0) || (cp->layer>=((pi[pino].layno)+1))) {
 633                                 e = t2_decode_packet(t2, c, src + len - c, tile, &cp->tcps[tileno], &pi[pino]);
 634                         } else {
 635                                 e = 0;
 636                         }
 637
 638                         /* progression in resolution */
 639                         for (i = 0; i < 3; i++){
 640                 volume->comps[pi[pino].compno].resno_decoded[i] = (e > 0) ? int_max(pi[pino].resno, volume->comps[pi[pino].compno].resno_decoded[i]) : volume->comps[pi[pino].compno].resno_decoded[i];
 641                         }
 642                         n++;
 643
 644                         if (e == -999) {                /* ADD */
 645                                 break;
 646                         } else {
 647                                 opj_event_msg(t2->cinfo, EVT_INFO, "  t2_decode_packet: %d bytes decoded\n",e);
 648                                 c += e;
 649                         }
 650                 }
 651         }
 652
 653         /* don't forget to release pi */
 654         pi_destroy(pi, cp, tileno);
 655
 656         if (e == -999) {
 657                 return e;
 658         }
 659
 660     return (c - src);
 661 }
 662
 663 /* ----------------------------------------------------------------------- */
 664
 665 opj_t2_t* t2_create(opj_common_ptr cinfo, opj_volume_t *volume, opj_cp_t *cp) {
 666         /* create the tcd structure */
 667         opj_t2_t *t2 = (opj_t2_t*)opj_malloc(sizeof(opj_t2_t));
 668         if(!t2) return NULL;
 669         t2->cinfo = cinfo;
 670         t2->volume = volume;
 671         t2->cp = cp;
 672
 673         return t2;
 674 }
 675
 676 void t2_destroy(opj_t2_t *t2) {
 677         if(t2) {
 678                 opj_free(t2);
 679         }
 680 }
 681