src/lib/openjp3d/t2.c

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