libavcodec/jpeg2000dec.c

   1 /*
   2  * JPEG 2000 image decoder
   3  * Copyright (c) 2007 Kamil Nowosad
   4  * Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
   5  *
   6  * This file is part of Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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  * JPEG 2000 image decoder
  26  */
  27
  28 #include "libavutil/common.h"
  29 #include "libavutil/opt.h"
  30 #include "avcodec.h"
  31 #include "bytestream.h"
  32 #include "internal.h"
  33 #include "thread.h"
  34 #include "jpeg2000.h"
  35
  36 #define JP2_SIG_TYPE    0x6A502020
  37 #define JP2_SIG_VALUE   0x0D0A870A
  38 #define JP2_CODESTREAM  0x6A703263
  39
  40 #define HAD_COC 0x01
  41 #define HAD_QCC 0x02
  42
  43 typedef struct Jpeg2000TilePart {
  44     uint16_t tp_idx;                    // Tile-part index
  45     uint8_t tile_index;                 // Tile index who refers the tile-part
  46     uint32_t tp_len;                    // Length of tile-part
  47     const uint8_t *tp_start_bstrm;      // Start address bit stream in tile-part
  48     const uint8_t *tp_end_bstrm;        // End address of the bit stream tile part
  49 } Jpeg2000TilePart;
  50
  51 /* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
  52  * one per component, so tile_part elements have a size of 3 */
  53 typedef struct Jpeg2000Tile {
  54     Jpeg2000Component   *comp;
  55     uint8_t             properties[4];
  56     Jpeg2000CodingStyle codsty[4];
  57     Jpeg2000QuantStyle  qntsty[4];
  58     Jpeg2000TilePart    tile_part[3];
  59 } Jpeg2000Tile;
  60
  61 typedef struct Jpeg2000DecoderContext {
  62     AVClass         *class;
  63     AVCodecContext  *avctx;
  64
  65     int             width, height;
  66     int             image_offset_x, image_offset_y;
  67     int             tile_offset_x, tile_offset_y;
  68     uint8_t         cbps[4];    // bits per sample in particular components
  69     uint8_t         sgnd[4];    // if a component is signed
  70     uint8_t         properties[4];
  71     int             cdx[4], cdy[4];
  72     int             precision;
  73     int             ncomponents;
  74     int             tile_width, tile_height;
  75     int             numXtiles, numYtiles;
  76     int             maxtilelen;
  77
  78     Jpeg2000CodingStyle codsty[4];
  79     Jpeg2000QuantStyle  qntsty[4];
  80
  81     const uint8_t   *buf_start;
  82     const uint8_t   *buf;
  83     const uint8_t   *buf_end;
  84     int             bit_index;
  85
  86     int16_t         curtileno;
  87     Jpeg2000Tile    *tile;
  88
  89     /*options parameters*/
  90     int16_t         lowres;
  91     int16_t         reduction_factor;
  92 } Jpeg2000DecoderContext;
  93
  94 /* get_bits functions for JPEG2000 packet bitstream
  95  * It is a get_bit function with a bit-stuffing routine. If the value of the
  96  * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
  97  * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
  98 static int get_bits(Jpeg2000DecoderContext *s, int n)
  99 {
 100     int res = 0;
 101     if (s->buf_end - s->buf < ((n - s->bit_index) >> 8))
 102         return AVERROR(EINVAL);
 103     while (--n >= 0) {
 104         res <<= 1;
 105         if (s->bit_index == 0) {
 106             s->bit_index = 7 + (*s->buf != 0xff);
 107             s->buf++;
 108         }
 109         s->bit_index--;
 110         res |= (*s->buf >> s->bit_index) & 1;
 111     }
 112     return res;
 113 }
 114
 115 static void jpeg2000_flush(Jpeg2000DecoderContext *s)
 116 {
 117     if (*s->buf == 0xff)
 118         s->buf++;
 119     s->bit_index = 8;
 120     s->buf++;
 121 }
 122
 123 /* decode the value stored in node */
 124 static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node,
 125                            int threshold)
 126 {
 127     Jpeg2000TgtNode *stack[30];
 128     int sp = -1, curval = 0;
 129
 130     while (node && !node->vis) {
 131         stack[++sp] = node;
 132         node        = node->parent;
 133     }
 134
 135     if (node)
 136         curval = node->val;
 137     else
 138         curval = stack[sp]->val;
 139
 140     while (curval < threshold && sp >= 0) {
 141         if (curval < stack[sp]->val)
 142             curval = stack[sp]->val;
 143         while (curval < threshold) {
 144             int ret;
 145             if ((ret = get_bits(s, 1)) > 0) {
 146                 stack[sp]->vis++;
 147                 break;
 148             } else if (!ret)
 149                 curval++;
 150             else
 151                 return ret;
 152         }
 153         stack[sp]->val = curval;
 154         sp--;
 155     }
 156     return curval;
 157 }
 158
 159 /* marker segments */
 160 /* get sizes and offsets of image, tiles; number of components */
 161 static int get_siz(Jpeg2000DecoderContext *s)
 162 {
 163     int i;
 164
 165     if (s->buf_end - s->buf < 36)
 166         return AVERROR(EINVAL);
 167
 168     s->avctx->profile = bytestream_get_be16(&s->buf); // Rsiz
 169     s->width          = bytestream_get_be32(&s->buf); // Width
 170     s->height         = bytestream_get_be32(&s->buf); // Height
 171     s->image_offset_x = bytestream_get_be32(&s->buf); // X0Siz
 172     s->image_offset_y = bytestream_get_be32(&s->buf); // Y0Siz
 173     s->tile_width     = bytestream_get_be32(&s->buf); // XTSiz
 174     s->tile_height    = bytestream_get_be32(&s->buf); // YTSiz
 175     s->tile_offset_x  = bytestream_get_be32(&s->buf); // XT0Siz
 176     s->tile_offset_y  = bytestream_get_be32(&s->buf); // YT0Siz
 177     s->ncomponents    = bytestream_get_be16(&s->buf); // CSiz
 178
 179     if (s->buf_end - s->buf < 2 * s->ncomponents)
 180         return AVERROR(EINVAL);
 181
 182     for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
 183         uint8_t x = bytestream_get_byte(&s->buf);
 184         s->cbps[i]   = (x & 0x7f) + 1;
 185         s->precision = FFMAX(s->cbps[i], s->precision);
 186         s->sgnd[i]   = (x & 0x80) == 1;
 187         s->cdx[i]    = bytestream_get_byte(&s->buf);
 188         s->cdy[i]    = bytestream_get_byte(&s->buf);
 189     }
 190
 191     s->numXtiles = ff_jpeg2000_ceildiv(s->width  - s->tile_offset_x, s->tile_width);
 192     s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);
 193
 194     s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(*s->tile));
 195     if (!s->tile)
 196         return AVERROR(ENOMEM);
 197
 198     for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
 199         Jpeg2000Tile *tile = s->tile + i;
 200
 201         tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
 202         if (!tile->comp)
 203             return AVERROR(ENOMEM);
 204     }
 205
 206     /* compute image size with reduction factor */
 207     s->avctx->width  = ff_jpeg2000_ceildivpow2(s->width  - s->image_offset_x,
 208                                                s->reduction_factor);
 209     s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
 210                                                s->reduction_factor);
 211
 212     switch (s->avctx->profile) {
 213     case FF_PROFILE_JPEG2000_DCINEMA_2K:
 214     case FF_PROFILE_JPEG2000_DCINEMA_4K:
 215         /* XYZ color-space for digital cinema profiles */
 216         s->avctx->pix_fmt = AV_PIX_FMT_XYZ12;
 217         break;
 218     default:
 219         /* For other profiles selects color-space according number of
 220          * components and bit depth precision. */
 221         switch (s->ncomponents) {
 222         case 1:
 223             if (s->precision > 8)
 224                 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
 225             else
 226                 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
 227             break;
 228         case 3:
 229             if (s->precision > 8)
 230                 s->avctx->pix_fmt = AV_PIX_FMT_RGB48;
 231             else
 232                 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
 233             break;
 234         case 4:
 235             s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
 236             break;
 237         default:
 238             /* pixel format can not be identified */
 239             s->avctx->pix_fmt = AV_PIX_FMT_NONE;
 240             break;
 241         }
 242         break;
 243     }
 244     return 0;
 245 }
 246
 247 /* get common part for COD and COC segments */
 248 static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
 249 {
 250     uint8_t byte;
 251
 252     if (s->buf_end - s->buf < 5)
 253         return AVERROR(EINVAL);
 254     c->nreslevels = bytestream_get_byte(&s->buf) + 1; // num of resolution levels - 1
 255
 256     /* compute number of resolution levels to decode */
 257     if (c->nreslevels < s->reduction_factor)
 258         c->nreslevels2decode = 1;
 259     else
 260         c->nreslevels2decode = c->nreslevels - s->reduction_factor;
 261
 262     c->log2_cblk_width  = bytestream_get_byte(&s->buf) + 2; // cblk width
 263     c->log2_cblk_height = bytestream_get_byte(&s->buf) + 2; // cblk height
 264
 265     c->cblk_style = bytestream_get_byte(&s->buf);
 266     if (c->cblk_style != 0) { // cblk style
 267         av_log(s->avctx, AV_LOG_ERROR, "no extra cblk styles supported\n");
 268         return -1;
 269     }
 270     c->transform = bytestream_get_byte(&s->buf); // DWT transformation type
 271     /* set integer 9/7 DWT in case of BITEXACT flag */
 272     if ((s->avctx->flags & CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97))
 273         c->transform = FF_DWT97_INT;
 274
 275     if (c->csty & JPEG2000_CSTY_PREC) {
 276         int i;
 277         for (i = 0; i < c->nreslevels; i++) {
 278             byte = bytestream_get_byte(&s->buf);
 279             c->log2_prec_widths[i]  =  byte       & 0x0F;    // precinct PPx
 280             c->log2_prec_heights[i] = (byte >> 4) & 0x0F;    // precinct PPy
 281         }
 282     }
 283     return 0;
 284 }
 285
 286 /* get coding parameters for a particular tile or whole image*/
 287 static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 288                    uint8_t *properties)
 289 {
 290     Jpeg2000CodingStyle tmp;
 291     int compno;
 292
 293     if (s->buf_end - s->buf < 5)
 294         return AVERROR(EINVAL);
 295
 296     tmp.log2_prec_width  =
 297     tmp.log2_prec_height = 15;
 298
 299     tmp.csty = bytestream_get_byte(&s->buf);
 300
 301     // get progression order
 302     tmp.prog_order = bytestream_get_byte(&s->buf);
 303
 304     tmp.nlayers = bytestream_get_be16(&s->buf);
 305     tmp.mct     = bytestream_get_byte(&s->buf); // multiple component transformation
 306
 307     get_cox(s, &tmp);
 308     for (compno = 0; compno < s->ncomponents; compno++)
 309         if (!(properties[compno] & HAD_COC))
 310             memcpy(c + compno, &tmp, sizeof(tmp));
 311     return 0;
 312 }
 313
 314 /* Get coding parameters for a component in the whole image or a
 315  * particular tile. */
 316 static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 317                    uint8_t *properties)
 318 {
 319     int compno;
 320
 321     if (s->buf_end - s->buf < 2)
 322         return AVERROR(EINVAL);
 323
 324     compno = bytestream_get_byte(&s->buf);
 325
 326     c      += compno;
 327     c->csty = bytestream_get_byte(&s->buf);
 328     get_cox(s, c);
 329
 330     properties[compno] |= HAD_COC;
 331     return 0;
 332 }
 333
 334 /* Get common part for QCD and QCC segments. */
 335 static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
 336 {
 337     int i, x;
 338
 339     if (s->buf_end - s->buf < 1)
 340         return AVERROR(EINVAL);
 341
 342     x = bytestream_get_byte(&s->buf); // Sqcd
 343
 344     q->nguardbits = x >> 5;
 345     q->quantsty   = x & 0x1f;
 346
 347     if (q->quantsty == JPEG2000_QSTY_NONE) {
 348         n -= 3;
 349         if (s->buf_end - s->buf < n)
 350             return AVERROR(EINVAL);
 351         for (i = 0; i < n; i++)
 352             q->expn[i] = bytestream_get_byte(&s->buf) >> 3;
 353     } else if (q->quantsty == JPEG2000_QSTY_SI) {
 354         if (s->buf_end - s->buf < 2)
 355             return AVERROR(EINVAL);
 356         x          = bytestream_get_be16(&s->buf);
 357         q->expn[0] = x >> 11;
 358         q->mant[0] = x & 0x7ff;
 359         for (i = 1; i < 32 * 3; i++) {
 360             int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
 361             q->expn[i] = curexpn;
 362             q->mant[i] = q->mant[0];
 363         }
 364     } else {
 365         n = (n - 3) >> 1;
 366         if (s->buf_end - s->buf < n)
 367             return AVERROR(EINVAL);
 368         for (i = 0; i < n; i++) {
 369             x          = bytestream_get_be16(&s->buf);
 370             q->expn[i] = x >> 11;
 371             q->mant[i] = x & 0x7ff;
 372         }
 373     }
 374     return 0;
 375 }
 376
 377 /* Get quantization parameters for a particular tile or a whole image. */
 378 static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 379                    uint8_t *properties)
 380 {
 381     Jpeg2000QuantStyle tmp;
 382     int compno;
 383
 384     if (get_qcx(s, n, &tmp))
 385         return -1;
 386     for (compno = 0; compno < s->ncomponents; compno++)
 387         if (!(properties[compno] & HAD_QCC))
 388             memcpy(q + compno, &tmp, sizeof(tmp));
 389     return 0;
 390 }
 391
 392 /* Get quantization parameters for a component in the whole image
 393  * on in a particular tile. */
 394 static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 395                    uint8_t *properties)
 396 {
 397     int compno;
 398
 399     if (s->buf_end - s->buf < 1)
 400         return AVERROR(EINVAL);
 401
 402     compno              = bytestream_get_byte(&s->buf);
 403     properties[compno] |= HAD_QCC;
 404     return get_qcx(s, n - 1, q + compno);
 405 }
 406
 407 /* Get start of tile segment. */
 408 static uint8_t get_sot(Jpeg2000DecoderContext *s, int n)
 409 {
 410     Jpeg2000TilePart *tp;
 411     uint16_t Isot;
 412     uint32_t Psot;
 413     uint8_t TPsot;
 414
 415     if (s->buf_end - s->buf < 4)
 416         return AVERROR(EINVAL);
 417
 418     Isot = bytestream_get_be16(&s->buf);        // Isot
 419     if (Isot) {
 420         av_log(s->avctx, AV_LOG_ERROR,
 421                "Not a DCINEMA JP2K file: more than one tile\n");
 422         return -1;
 423     }
 424     Psot  = bytestream_get_be32(&s->buf);       // Psot
 425     TPsot = bytestream_get_byte(&s->buf);       // TPsot
 426
 427     /* Read TNSot but not used */
 428     bytestream_get_byte(&s->buf);               // TNsot
 429
 430     tp             = s->tile[s->curtileno].tile_part + TPsot;
 431     tp->tile_index = Isot;
 432     tp->tp_len     = Psot;
 433     tp->tp_idx     = TPsot;
 434
 435     /* Start of bit stream. Pointer to SOD marker
 436      * Check SOD marker is present. */
 437     if (JPEG2000_SOD == bytestream_get_be16(&s->buf))
 438         tp->tp_start_bstrm = s->buf;
 439     else {
 440         av_log(s->avctx, AV_LOG_ERROR, "SOD marker not found \n");
 441         return -1;
 442     }
 443
 444     /* End address of bit stream =
 445      *     start address + (Psot - size of SOT HEADER(n)
 446      *     - size of SOT MARKER(2)  - size of SOD marker(2) */
 447     tp->tp_end_bstrm = s->buf + (tp->tp_len - n - 4);
 448
 449     // set buffer pointer to end of tile part header
 450     s->buf = tp->tp_end_bstrm;
 451
 452     return 0;
 453 }
 454
 455 /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
 456  * Used to know the number of tile parts and lengths.
 457  * There may be multiple TLMs in the header.
 458  * TODO: The function is not used for tile-parts management, nor anywhere else.
 459  * It can be useful to allocate memory for tile parts, before managing the SOT
 460  * markers. Parsing the TLM header is needed to increment the input header
 461  * buffer.
 462  * This marker is mandatory for DCI. */
 463 static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
 464 {
 465     uint8_t Stlm, ST, SP, tile_tlm, i;
 466     bytestream_get_byte(&s->buf);               /* Ztlm: skipped */
 467     Stlm = bytestream_get_byte(&s->buf);
 468
 469     // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
 470     ST = (Stlm >> 4) & 0x03;
 471     // TODO: Manage case of ST = 0b11 --> raise error
 472     SP       = (Stlm >> 6) & 0x01;
 473     tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
 474     for (i = 0; i < tile_tlm; i++) {
 475         switch (ST) {
 476         case 0:
 477             break;
 478         case 1:
 479             bytestream_get_byte(&s->buf);
 480             break;
 481         case 2:
 482             bytestream_get_be16(&s->buf);
 483             break;
 484         case 3:
 485             bytestream_get_be32(&s->buf);
 486             break;
 487         }
 488         if (SP == 0) {
 489             bytestream_get_be16(&s->buf);
 490         } else {
 491             bytestream_get_be32(&s->buf);
 492         }
 493     }
 494     return 0;
 495 }
 496
 497 static int init_tile(Jpeg2000DecoderContext *s, int tileno)
 498 {
 499     int compno;
 500     int tilex = tileno % s->numXtiles;
 501     int tiley = tileno / s->numXtiles;
 502     Jpeg2000Tile *tile = s->tile + tileno;
 503     Jpeg2000CodingStyle *codsty;
 504     Jpeg2000QuantStyle  *qntsty;
 505
 506     if (!tile->comp)
 507         return AVERROR(ENOMEM);
 508
 509     /* copy codsty, qnsty to tile. TODO: Is it the best way?
 510      * codsty, qnsty is an array of 4 structs Jpeg2000CodingStyle
 511      * and Jpeg2000QuantStyle */
 512     memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(*codsty));
 513     memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(*qntsty));
 514
 515     for (compno = 0; compno < s->ncomponents; compno++) {
 516         Jpeg2000Component *comp = tile->comp + compno;
 517         int ret; // global bandno
 518         codsty = tile->codsty + compno;
 519         qntsty = tile->qntsty + compno;
 520
 521         comp->coord_o[0][0] = FFMAX(tilex       * s->tile_width  + s->tile_offset_x, s->image_offset_x);
 522         comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width  + s->tile_offset_x, s->width);
 523         comp->coord_o[1][0] = FFMAX(tiley       * s->tile_height + s->tile_offset_y, s->image_offset_y);
 524         comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
 525
 526         // FIXME: add a dcinema profile check ?
 527         // value is guaranteed by profile (orig=0, 1 tile)
 528         comp->coord[0][0] = 0;
 529         comp->coord[0][1] = s->avctx->width;
 530         comp->coord[1][0] = 0;
 531         comp->coord[1][1] = s->avctx->height;
 532
 533         if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
 534                                              s->cbps[compno], s->cdx[compno],
 535                                              s->cdy[compno], s->avctx))
 536             return ret;
 537     }
 538     return 0;
 539 }
 540
 541 /* Read the number of coding passes. */
 542 static int getnpasses(Jpeg2000DecoderContext *s)
 543 {
 544     int num;
 545     if (!get_bits(s, 1))
 546         return 1;
 547     if (!get_bits(s, 1))
 548         return 2;
 549     if ((num = get_bits(s, 2)) != 3)
 550         return num < 0 ? num : 3 + num;
 551     if ((num = get_bits(s, 5)) != 31)
 552         return num < 0 ? num : 6 + num;
 553     num = get_bits(s, 7);
 554     return num < 0 ? num : 37 + num;
 555 }
 556
 557 static int getlblockinc(Jpeg2000DecoderContext *s)
 558 {
 559     int res = 0, ret;
 560     while (ret = get_bits(s, 1)) {
 561         if (ret < 0)
 562             return ret;
 563         res++;
 564     }
 565     return res;
 566 }
 567
 568 static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
 569                                   Jpeg2000CodingStyle *codsty,
 570                                   Jpeg2000ResLevel *rlevel, int precno,
 571                                   int layno, uint8_t *expn, int numgbits)
 572 {
 573     int bandno, cblkno, ret, nb_code_blocks;
 574
 575     if (!(ret = get_bits(s, 1))) {
 576         jpeg2000_flush(s);
 577         return 0;
 578     } else if (ret < 0)
 579         return ret;
 580
 581     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
 582         Jpeg2000Band *band = rlevel->band + bandno;
 583         Jpeg2000Prec *prec = band->prec + precno;
 584
 585         if (band->coord[0][0] == band->coord[0][1] ||
 586             band->coord[1][0] == band->coord[1][1])
 587             continue;
 588         prec->yi0 = 0;
 589         prec->xi0 = 0;
 590         nb_code_blocks =  prec->nb_codeblocks_height *
 591                           prec->nb_codeblocks_width;
 592         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
 593             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
 594             int incl, newpasses, llen;
 595
 596             if (cblk->npasses)
 597                 incl = get_bits(s, 1);
 598             else
 599                 incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno;
 600             if (!incl)
 601                 continue;
 602             else if (incl < 0)
 603                 return incl;
 604
 605             if (!cblk->npasses)
 606                 cblk->nonzerobits = expn[bandno] + numgbits - 1 -
 607                                     tag_tree_decode(s, prec->zerobits + cblkno,
 608                                                     100);
 609             if ((newpasses = getnpasses(s)) < 0)
 610                 return newpasses;
 611             if ((llen = getlblockinc(s)) < 0)
 612                 return llen;
 613             cblk->lblock += llen;
 614             if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0)
 615                 return ret;
 616             cblk->lengthinc = ret;
 617             cblk->npasses  += newpasses;
 618         }
 619     }
 620     jpeg2000_flush(s);
 621
 622     if (codsty->csty & JPEG2000_CSTY_EPH) {
 623         if (AV_RB16(s->buf) == JPEG2000_EPH)
 624             s->buf += 2;
 625         else
 626             av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
 627     }
 628
 629     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
 630         Jpeg2000Band *band = rlevel->band + bandno;
 631         Jpeg2000Prec *prec = band->prec + precno;
 632
 633         nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
 634         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
 635             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
 636             if (s->buf_end - s->buf < cblk->lengthinc)
 637                 return AVERROR(EINVAL);
 638             /* Code-block data can be empty. In that case initialize data
 639              * with 0xFFFF. */
 640             if (cblk->lengthinc > 0) {
 641                 bytestream_get_buffer(&s->buf, cblk->data, cblk->lengthinc);
 642             } else {
 643                 cblk->data[0] = 0xFF;
 644                 cblk->data[1] = 0xFF;
 645             }
 646             cblk->length   += cblk->lengthinc;
 647             cblk->lengthinc = 0;
 648         }
 649     }
 650     return 0;
 651 }
 652
 653 static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
 654 {
 655     int layno, reslevelno, compno, precno, ok_reslevel;
 656     uint8_t prog_order = tile->codsty[0].prog_order;
 657     uint16_t x;
 658     uint16_t y;
 659
 660     s->bit_index = 8;
 661     switch (prog_order) {
 662     case JPEG2000_PGOD_LRCP:
 663         for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
 664             ok_reslevel = 1;
 665             for (reslevelno = 0; ok_reslevel; reslevelno++) {
 666                 ok_reslevel = 0;
 667                 for (compno = 0; compno < s->ncomponents; compno++) {
 668                     Jpeg2000CodingStyle *codsty = tile->codsty + compno;
 669                     Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
 670                     if (reslevelno < codsty->nreslevels) {
 671                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
 672                                                    reslevelno;
 673                         ok_reslevel = 1;
 674                         for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
 675                             if (jpeg2000_decode_packet(s,
 676                                                        codsty, rlevel,
 677                                                        precno, layno,
 678                                                        qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
 679                                                        qntsty->nguardbits))
 680                                 return -1;
 681                     }
 682                 }
 683             }
 684         }
 685         break;
 686
 687     case JPEG2000_PGOD_CPRL:
 688         for (compno = 0; compno < s->ncomponents; compno++) {
 689             Jpeg2000CodingStyle *codsty = tile->codsty + compno;
 690             Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
 691
 692             /* Set bit stream buffer address according to tile-part.
 693              * For DCinema one tile-part per component, so can be
 694              * indexed by component. */
 695             s->buf = tile->tile_part[compno].tp_start_bstrm;
 696
 697             /* Position loop (y axis)
 698              * TODO: Automate computing of step 256.
 699              * Fixed here, but to be computed before entering here. */
 700             for (y = 0; y < s->height; y += 256) {
 701                 /* Position loop (y axis)
 702                  * TODO: automate computing of step 256.
 703                  * Fixed here, but to be computed before entering here. */
 704                 for (x = 0; x < s->width; x += 256) {
 705                     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
 706                         uint16_t prcx, prcy;
 707                         uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
 708                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
 709
 710                         if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
 711                               (y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
 712                             continue;
 713
 714                         if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
 715                               (x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
 716                             continue;
 717
 718                         // check if a precinct exists
 719                         prcx   = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
 720                         prcy   = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
 721                         precno = prcx + rlevel->num_precincts_x * prcy;
 722                         for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
 723                             if (jpeg2000_decode_packet(s, codsty, rlevel,
 724                                                        precno, layno,
 725                                                        qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
 726                                                        qntsty->nguardbits))
 727                                 return -1;
 728                         }
 729                     }
 730                 }
 731             }
 732         }
 733         break;
 734
 735     default:
 736         break;
 737     }
 738
 739     /* EOC marker reached */
 740     s->buf += 2;
 741
 742     return 0;
 743 }
 744
 745 /* TIER-1 routines */
 746 static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
 747                            int bpno, int bandno)
 748 {
 749     int mask = 3 << (bpno - 1), y0, x, y;
 750
 751     for (y0 = 0; y0 < height; y0 += 4)
 752         for (x = 0; x < width; x++)
 753             for (y = y0; y < height && y < y0 + 4; y++)
 754                 if ((t1->flags[y + 1][x + 1] & JPEG2000_T1_SIG_NB)
 755                     && !(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
 756                     if (ff_mqc_decode(&t1->mqc,
 757                                       t1->mqc.cx_states +
 758                                       ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
 759                                                              bandno))) {
 760                         int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
 761                                                                     &xorbit);
 762
 763                         t1->data[y][x] =
 764                             (ff_mqc_decode(&t1->mqc,
 765                                            t1->mqc.cx_states + ctxno) ^ xorbit)
 766                             ? -mask : mask;
 767
 768                         ff_jpeg2000_set_significance(t1, x, y,
 769                                                      t1->data[y][x] < 0);
 770                     }
 771                     t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;
 772                 }
 773 }
 774
 775 static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
 776                            int bpno)
 777 {
 778     int phalf, nhalf;
 779     int y0, x, y;
 780
 781     phalf = 1 << (bpno - 1);
 782     nhalf = -phalf;
 783
 784     for (y0 = 0; y0 < height; y0 += 4)
 785         for (x = 0; x < width; x++)
 786             for (y = y0; y < height && y < y0 + 4; y++)
 787                 if ((t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
 788                     int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1]);
 789                     int r     = ff_mqc_decode(&t1->mqc,
 790                                               t1->mqc.cx_states + ctxno)
 791                                 ? phalf : nhalf;
 792                     t1->data[y][x]          += t1->data[y][x] < 0 ? -r : r;
 793                     t1->flags[y + 1][x + 1] |= JPEG2000_T1_REF;
 794                 }
 795 }
 796
 797 static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
 798                            int width, int height, int bpno, int bandno,
 799                            int seg_symbols)
 800 {
 801     int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
 802
 803     for (y0 = 0; y0 < height; y0 += 4)
 804         for (x = 0; x < width; x++) {
 805             if (y0 + 3 < height &&
 806                 !((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 807                   (t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 808                   (t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 809                   (t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)))) {
 810                 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
 811                     continue;
 812                 runlen = ff_mqc_decode(&t1->mqc,
 813                                        t1->mqc.cx_states + MQC_CX_UNI);
 814                 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc,
 815                                                        t1->mqc.cx_states +
 816                                                        MQC_CX_UNI);
 817                 dec = 1;
 818             } else {
 819                 runlen = 0;
 820                 dec    = 0;
 821             }
 822
 823             for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
 824                 if (!dec) {
 825                     if (!(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
 826                         dec = ff_mqc_decode(&t1->mqc,
 827                                             t1->mqc.cx_states +
 828                                             ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
 829                                                                    bandno));
 830                 }
 831                 if (dec) {
 832                     int xorbit;
 833                     int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
 834                                                         &xorbit);
 835                     t1->data[y][x] = (ff_mqc_decode(&t1->mqc,
 836                                                     t1->mqc.cx_states + ctxno) ^
 837                                       xorbit)
 838                                      ? -mask : mask;
 839                     ff_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0);
 840                 }
 841                 dec = 0;
 842                 t1->flags[y + 1][x + 1] &= ~JPEG2000_T1_VIS;
 843             }
 844         }
 845     if (seg_symbols) {
 846         int val;
 847         val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 848         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 849         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 850         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 851         if (val != 0xa)
 852             av_log(s->avctx, AV_LOG_ERROR,
 853                    "Segmentation symbol value incorrect\n");
 854     }
 855 }
 856
 857 static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
 858                        Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
 859                        int width, int height, int bandpos)
 860 {
 861     int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
 862
 863     for (y = 0; y < height; y++)
 864         memset(t1->data[y], 0, width * sizeof(width));
 865     /* If code-block contains no compressed data: nothing to do. */
 866     if (!cblk->length)
 867         return 0;
 868     for (y = 0; y < height + 2; y++)
 869         memset(t1->flags[y], 0, (width + 2) * sizeof(width));
 870
 871     ff_mqc_initdec(&t1->mqc, cblk->data);
 872     cblk->data[cblk->length]     = 0xff;
 873     cblk->data[cblk->length + 1] = 0xff;
 874
 875     while (passno--) {
 876         switch (pass_t) {
 877         case 0:
 878             decode_sigpass(t1, width, height, bpno + 1, bandpos);
 879             break;
 880         case 1:
 881             decode_refpass(t1, width, height, bpno + 1);
 882             break;
 883         case 2:
 884             decode_clnpass(s, t1, width, height, bpno + 1, bandpos,
 885                            codsty->cblk_style & JPEG2000_CBLK_SEGSYM);
 886             break;
 887         }
 888
 889         pass_t++;
 890         if (pass_t == 3) {
 891             bpno--;
 892             pass_t = 0;
 893         }
 894     }
 895     return 0;
 896 }
 897
 898 /* TODO: Verify dequantization for lossless case
 899  * comp->data can be float or int
 900  * band->stepsize can be float or int
 901  * depending on the type of DWT transformation.
 902  * see ISO/IEC 15444-1:2002 A.6.1 */
 903
 904 /* Float dequantization of a codeblock.*/
 905 static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
 906                                  Jpeg2000Component *comp,
 907                                  Jpeg2000T1Context *t1, Jpeg2000Band *band)
 908 {
 909     int i, j, idx;
 910     float *datap = &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
 911     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
 912         for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
 913             idx        = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
 914             datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
 915         }
 916     return;
 917 }
 918
 919 /* Integer dequantization of a codeblock.*/
 920 static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
 921                                Jpeg2000Component *comp,
 922                                Jpeg2000T1Context *t1, Jpeg2000Band *band)
 923 {
 924     int i, j, idx;
 925     int32_t *datap =
 926         (int32_t *) &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
 927     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
 928         for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
 929             idx        = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
 930             datap[idx] =
 931                 ((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
 932         }
 933     return;
 934 }
 935
 936 /* Inverse ICT parameters in float and integer.
 937  * int value = (float value) * (1<<16) */
 938 static const float f_ict_params[4] = {
 939     1.402f,
 940     0.34413f,
 941     0.71414f,
 942     1.772f
 943 };
 944 static const int   i_ict_params[4] = {
 945      91881,
 946      22553,
 947      46802,
 948     116130
 949 };
 950
 951 static int mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
 952 {
 953     int i, csize = 1;
 954     int ret = 0;
 955     int32_t *src[3],  i0,  i1,  i2;
 956     float   *srcf[3], i0f, i1f, i2f;
 957
 958     for (i = 0; i < 3; i++)
 959         if (tile->codsty[0].transform == FF_DWT97)
 960             srcf[i] = tile->comp[i].data;
 961         else
 962             src[i] = (int32_t *)tile->comp[i].data;
 963
 964     for (i = 0; i < 2; i++)
 965         csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
 966     switch (tile->codsty[0].transform) {
 967     case FF_DWT97:
 968         for (i = 0; i < csize; i++) {
 969             i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
 970             i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
 971                            - (f_ict_params[2] * *srcf[2]);
 972             i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
 973             *srcf[0]++ = i0f;
 974             *srcf[1]++ = i1f;
 975             *srcf[2]++ = i2f;
 976         }
 977         break;
 978     case FF_DWT97_INT:
 979         for (i = 0; i < csize; i++) {
 980             i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
 981             i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
 982                          - (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
 983             i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
 984             *src[0]++ = i0;
 985             *src[1]++ = i1;
 986             *src[2]++ = i2;
 987         }
 988         break;
 989     case FF_DWT53:
 990         for (i = 0; i < csize; i++) {
 991             i1 = *src[0] - (*src[2] + *src[1] >> 2);
 992             i0 = i1 + *src[2];
 993             i2 = i1 + *src[1];
 994             *src[0]++ = i0;
 995             *src[1]++ = i1;
 996             *src[2]++ = i2;
 997         }
 998         break;
 999     }
1000     return ret;
1001 }
1002
1003 static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
1004                                 AVFrame *picture)
1005 {
1006     int compno, reslevelno, bandno;
1007     int x, y;
1008
1009     uint8_t *line;
1010     Jpeg2000T1Context t1;
1011     /* Loop on tile components */
1012
1013     for (compno = 0; compno < s->ncomponents; compno++) {
1014         Jpeg2000Component *comp     = tile->comp + compno;
1015         Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1016         /* Loop on resolution levels */
1017         for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
1018             Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1019             /* Loop on bands */
1020             for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1021                 uint16_t nb_precincts, precno;
1022                 Jpeg2000Band *band = rlevel->band + bandno;
1023                 int cblkno = 0, bandpos;
1024                 bandpos = bandno + (reslevelno > 0);
1025
1026                 nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
1027                 /* Loop on precincts */
1028                 for (precno = 0; precno < nb_precincts; precno++) {
1029                     Jpeg2000Prec *prec = band->prec + precno;
1030
1031                     /* Loop on codeblocks */
1032                     for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
1033                         int x, y;
1034                         Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1035                         decode_cblk(s, codsty, &t1, cblk,
1036                                     cblk->coord[0][1] - cblk->coord[0][0],
1037                                     cblk->coord[1][1] - cblk->coord[1][0],
1038                                     bandpos);
1039
1040                         /* Manage band offsets */
1041                         x = cblk->coord[0][0];
1042                         y = cblk->coord[1][0];
1043                         if ((reslevelno > 0) && ((bandno + 1) & 1)) {
1044                             Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1045                             x += pres->coord[0][1] - pres->coord[0][0];
1046                         }
1047                         if ((reslevelno > 0) && ((bandno + 1) & 2)) {
1048                             Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1049                             y += pres->coord[1][1] - pres->coord[1][0];
1050                         }
1051
1052                         if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1053                             dequantization_int(x, y, cblk, comp, &t1, band);
1054                         else
1055                             dequantization_float(x, y, cblk, comp, &t1, band);
1056                    } /* end cblk */
1057                 } /*end prec */
1058             } /* end band */
1059         } /* end reslevel */
1060
1061         /* inverse DWT */
1062         ff_dwt_decode(&comp->dwt, comp->data);
1063     } /*end comp */
1064
1065     /* inverse MCT transformation */
1066     if (tile->codsty[0].mct)
1067         mct_decode(s, tile);
1068
1069     if (s->avctx->pix_fmt == PIX_FMT_BGRA) // RGBA -> BGRA
1070         FFSWAP(float *, tile->comp[0].data, tile->comp[2].data);
1071
1072     if (s->precision <= 8) {
1073         for (compno = 0; compno < s->ncomponents; compno++) {
1074             Jpeg2000Component *comp = tile->comp + compno;
1075             int32_t *datap = (int32_t *)comp->data;
1076             y    = tile->comp[compno].coord[1][0] - s->image_offset_y;
1077             line = picture->data[0] + y * picture->linesize[0];
1078             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1079                 uint8_t *dst;
1080
1081                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
1082                 dst = line + x * s->ncomponents + compno;
1083
1084                 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
1085                     *datap += 1 << (s->cbps[compno] - 1);
1086                     if (*datap < 0)
1087                         *datap = 0;
1088                     else if (*datap >= (1 << s->cbps[compno]))
1089                         *datap = (1 << s->cbps[compno]) - 1;
1090                     *dst = *datap++;
1091                     dst += s->ncomponents;
1092                 }
1093                 line += picture->linesize[0];
1094             }
1095         }
1096     } else {
1097         for (compno = 0; compno < s->ncomponents; compno++) {
1098             Jpeg2000Component *comp = tile->comp + compno;
1099             float *datap = comp->data;
1100             int32_t *i_datap = (int32_t *) comp->data;
1101             uint16_t *linel;
1102
1103             y     = tile->comp[compno].coord[1][0] - s->image_offset_y;
1104             linel = (uint16_t *)picture->data[0] + y * (picture->linesize[0] >> 1);
1105             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1106                 uint16_t *dst;
1107                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
1108                 dst = linel + (x * s->ncomponents + compno);
1109                 for (; x < s->avctx->width; x += s->cdx[compno]) {
1110                     int16_t val;
1111                     /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
1112                     if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1113                         val = *i_datap + (1 << (s->cbps[compno] - 1));
1114                     else
1115                         val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
1116                     val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
1117                     /* align 12 bit values in little-endian mode */
1118                     *dst = val << 4;
1119                     datap++;
1120                     i_datap++;
1121                     dst += s->ncomponents;
1122                 }
1123                 linel += picture->linesize[0] >> 1;
1124             }
1125         }
1126     }
1127     return 0;
1128 }
1129
1130 static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
1131 {
1132     int tileno, compno;
1133     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1134         for (compno = 0; compno < s->ncomponents; compno++) {
1135             Jpeg2000Component *comp     = s->tile[tileno].comp   + compno;
1136             Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno;
1137
1138             ff_jpeg2000_cleanup(comp, codsty);
1139         }
1140         av_freep(&s->tile[tileno].comp);
1141     }
1142     av_freep(&s->tile);
1143 }
1144
1145 static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
1146 {
1147     Jpeg2000CodingStyle *codsty = s->codsty;
1148     Jpeg2000QuantStyle *qntsty  = s->qntsty;
1149     uint8_t *properties         = s->properties;
1150
1151     for (;;) {
1152         int len, ret = 0;
1153         uint16_t marker;
1154         const uint8_t *oldbuf;
1155
1156         if (s->buf_end - s->buf < 2) {
1157             av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
1158             break;
1159         }
1160
1161         marker = bytestream_get_be16(&s->buf);
1162         oldbuf = s->buf;
1163
1164         if (marker == JPEG2000_EOC)
1165             break;
1166
1167         if (s->buf_end - s->buf < 2)
1168             return AVERROR(EINVAL);
1169         len = bytestream_get_be16(&s->buf);
1170         switch (marker) {
1171         case JPEG2000_SIZ:
1172             ret = get_siz(s);
1173             break;
1174         case JPEG2000_COC:
1175             ret = get_coc(s, codsty, properties);
1176             break;
1177         case JPEG2000_COD:
1178             ret = get_cod(s, codsty, properties);
1179             break;
1180         case JPEG2000_QCC:
1181             ret = get_qcc(s, len, qntsty, properties);
1182             break;
1183         case JPEG2000_QCD:
1184             ret = get_qcd(s, len, qntsty, properties);
1185             break;
1186         case JPEG2000_SOT:
1187             ret = get_sot(s, len);
1188             break;
1189         case JPEG2000_COM:
1190             // the comment is ignored
1191             s->buf += len - 2;
1192             break;
1193         case JPEG2000_TLM:
1194             // Tile-part lengths
1195             ret = get_tlm(s, len);
1196             break;
1197         default:
1198             av_log(s->avctx, AV_LOG_ERROR,
1199                    "unsupported marker 0x%.4X at pos 0x%lX\n",
1200                    marker, (uint64_t)(s->buf - s->buf_start - 4));
1201             s->buf += len - 2;
1202             break;
1203         }
1204         if (((s->buf - oldbuf != len) && (marker != JPEG2000_SOT)) || ret) {
1205             av_log(s->avctx, AV_LOG_ERROR,
1206                    "error during processing marker segment %.4x\n", marker);
1207             return ret ? ret : -1;
1208         }
1209     }
1210     return 0;
1211 }
1212
1213 /* Read bit stream packets --> T2 operation. */
1214 static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
1215 {
1216     int ret = 0;
1217     Jpeg2000Tile *tile = s->tile + s->curtileno;
1218
1219     if (ret = init_tile(s, s->curtileno))
1220         return ret;
1221     if (ret = jpeg2000_decode_packets(s, tile))
1222         return ret;
1223
1224     return 0;
1225 }
1226
1227 static int jp2_find_codestream(Jpeg2000DecoderContext *s)
1228 {
1229     int32_t atom_size;
1230     int found_codestream = 0, search_range = 10;
1231
1232     // Skip JPEG 2000 signature atom.
1233     s->buf += 12;
1234
1235     while (!found_codestream && search_range) {
1236         atom_size = AV_RB32(s->buf);
1237         if (AV_RB32(s->buf + 4) == JP2_CODESTREAM) {
1238             found_codestream = 1;
1239             s->buf += 8;
1240         } else {
1241             s->buf += atom_size;
1242             search_range--;
1243         }
1244     }
1245
1246     if (found_codestream)
1247         return 1;
1248     return 0;
1249 }
1250
1251 static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
1252                                  int *got_frame, AVPacket *avpkt)
1253 {
1254     Jpeg2000DecoderContext *s = avctx->priv_data;
1255     ThreadFrame frame = { .f = data };
1256     AVFrame *picture = data;
1257     int tileno, ret;
1258
1259     s->avctx     = avctx;
1260     s->buf       = s->buf_start = avpkt->data;
1261     s->buf_end   = s->buf_start + avpkt->size;
1262     s->curtileno = 0; // TODO: only one tile in DCI JP2K. to implement for more tiles
1263
1264     // reduction factor, i.e number of resolution levels to skip
1265     s->reduction_factor = s->lowres;
1266
1267     ff_jpeg2000_init_tier1_luts();
1268
1269     if (s->buf_end - s->buf < 2)
1270         return AVERROR(EINVAL);
1271
1272     // check if the image is in jp2 format
1273     if ((AV_RB32(s->buf) == 12) &&
1274         (AV_RB32(s->buf + 4) == JP2_SIG_TYPE) &&
1275         (AV_RB32(s->buf + 8) == JP2_SIG_VALUE)) {
1276         if (!jp2_find_codestream(s)) {
1277             av_log(avctx, AV_LOG_ERROR,
1278                    "couldn't find jpeg2k codestream atom\n");
1279             return -1;
1280         }
1281     }
1282
1283     if (bytestream_get_be16(&s->buf) != JPEG2000_SOC) {
1284         av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
1285         return -1;
1286     }
1287     if (ret = jpeg2000_read_main_headers(s))
1288         return ret;
1289
1290     /* get picture buffer */
1291     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
1292         av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed.\n");
1293         return ret;
1294     }
1295     picture->pict_type = AV_PICTURE_TYPE_I;
1296     picture->key_frame = 1;
1297
1298     if (ret = jpeg2000_read_bitstream_packets(s))
1299         return ret;
1300     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
1301         if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
1302             return ret;
1303     jpeg2000_dec_cleanup(s);
1304
1305     *got_frame = 1;
1306
1307     return s->buf - s->buf_start;
1308 }
1309
1310 #define OFFSET(x) offsetof(Jpeg2000DecoderContext, x)
1311 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1312
1313 static const AVOption options[] = {
1314     { "lowres",  "Lower the decoding resolution by a power of two",
1315         OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
1316     { NULL },
1317 };
1318
1319 static const AVProfile profiles[] = {
1320     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0,  "JPEG 2000 codestream restriction 0"   },
1321     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1,  "JPEG 2000 codestream restriction 1"   },
1322     { FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
1323     { FF_PROFILE_JPEG2000_DCINEMA_2K,             "JPEG 2000 digital cinema 2K"          },
1324     { FF_PROFILE_JPEG2000_DCINEMA_4K,             "JPEG 2000 digital cinema 4K"          },
1325     { FF_PROFILE_UNKNOWN },
1326 };
1327
1328 static const AVClass class = {
1329     .class_name = "jpeg2000",
1330     .item_name  = av_default_item_name,
1331     .option     = options,
1332     .version    = LIBAVUTIL_VERSION_INT,
1333 };
1334
1335 AVCodec ff_jpeg2000_decoder = {
1336     .name           = "jpeg2000",
1337     .long_name      = NULL_IF_CONFIG_SMALL("JPEG 2000"),
1338     .type           = AVMEDIA_TYPE_VIDEO,
1339     .id             = AV_CODEC_ID_JPEG2000,
1340     .capabilities   = CODEC_CAP_FRAME_THREADS,
1341     .priv_data_size = sizeof(Jpeg2000DecoderContext),
1342     .decode         = jpeg2000_decode_frame,
1343     .priv_class     = &class,
1344     .pix_fmts       = (enum PixelFormat[]) { AV_PIX_FMT_XYZ12,
1345                                              AV_PIX_FMT_GRAY8,
1346                                              -1 },
1347     .profiles       = NULL_IF_CONFIG_SMALL(profiles)
1348 };