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     GetByteContext tpg;                 // bit stream in tile-part
  48 } Jpeg2000TilePart;
  49
  50 /* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
  51  * one per component, so tile_part elements have a size of 3 */
  52 typedef struct Jpeg2000Tile {
  53     Jpeg2000Component   *comp;
  54     uint8_t             properties[4];
  55     Jpeg2000CodingStyle codsty[4];
  56     Jpeg2000QuantStyle  qntsty[4];
  57     Jpeg2000TilePart    tile_part[3];
  58 } Jpeg2000Tile;
  59
  60 typedef struct Jpeg2000DecoderContext {
  61     AVClass         *class;
  62     AVCodecContext  *avctx;
  63     GetByteContext g;
  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     unsigned        numXtiles, numYtiles;
  76     int             maxtilelen;
  77
  78     Jpeg2000CodingStyle codsty[4];
  79     Jpeg2000QuantStyle  qntsty[4];
  80
  81     int             bit_index;
  82
  83     int16_t         curtileno;
  84     Jpeg2000Tile    *tile;
  85
  86     /*options parameters*/
  87     int16_t         lowres;
  88     int16_t         reduction_factor;
  89 } Jpeg2000DecoderContext;
  90
  91 /* get_bits functions for JPEG2000 packet bitstream
  92  * It is a get_bit function with a bit-stuffing routine. If the value of the
  93  * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
  94  * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
  95 static int get_bits(Jpeg2000DecoderContext *s, int n)
  96 {
  97     int res = 0;
  98     while (--n >= 0) {
  99         res <<= 1;
 100         if (s->bit_index == 0) {
 101             s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu);
 102         }
 103         s->bit_index--;
 104         res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1;
 105     }
 106     return res;
 107 }
 108
 109 static void jpeg2000_flush(Jpeg2000DecoderContext *s)
 110 {
 111     if (bytestream2_get_byte(&s->g) == 0xff)
 112         bytestream2_skip(&s->g, 1);
 113     s->bit_index = 8;
 114 }
 115
 116 /* decode the value stored in node */
 117 static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node,
 118                            int threshold)
 119 {
 120     Jpeg2000TgtNode *stack[30];
 121     int sp = -1, curval = 0;
 122
 123     while (node && !node->vis) {
 124         stack[++sp] = node;
 125         node        = node->parent;
 126     }
 127
 128     if (node)
 129         curval = node->val;
 130     else
 131         curval = stack[sp]->val;
 132
 133     while (curval < threshold && sp >= 0) {
 134         if (curval < stack[sp]->val)
 135             curval = stack[sp]->val;
 136         while (curval < threshold) {
 137             int ret;
 138             if ((ret = get_bits(s, 1)) > 0) {
 139                 stack[sp]->vis++;
 140                 break;
 141             } else if (!ret)
 142                 curval++;
 143             else
 144                 return ret;
 145         }
 146         stack[sp]->val = curval;
 147         sp--;
 148     }
 149     return curval;
 150 }
 151
 152 /* marker segments */
 153 /* get sizes and offsets of image, tiles; number of components */
 154 static int get_siz(Jpeg2000DecoderContext *s)
 155 {
 156     int i;
 157     int ncomponents;
 158
 159     if (bytestream2_get_bytes_left(&s->g) < 36)
 160         return AVERROR_INVALIDDATA;
 161
 162     s->avctx->profile = bytestream2_get_be16u(&s->g); // Rsiz
 163     s->width          = bytestream2_get_be32u(&s->g); // Width
 164     s->height         = bytestream2_get_be32u(&s->g); // Height
 165     s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
 166     s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
 167     s->tile_width     = bytestream2_get_be32u(&s->g); // XTSiz
 168     s->tile_height    = bytestream2_get_be32u(&s->g); // YTSiz
 169     s->tile_offset_x  = bytestream2_get_be32u(&s->g); // XT0Siz
 170     s->tile_offset_y  = bytestream2_get_be32u(&s->g); // YT0Siz
 171     ncomponents       = bytestream2_get_be16u(&s->g); // CSiz
 172
 173     if (ncomponents <= 0) {
 174         av_log(s->avctx, AV_LOG_ERROR, "Invalid number of components: %d\n",
 175                s->ncomponents);
 176         return AVERROR_INVALIDDATA;
 177     }
 178
 179     if (ncomponents > 3) {
 180         avpriv_request_sample(s->avctx, "Support for %d components",
 181                               s->ncomponents);
 182         return AVERROR_PATCHWELCOME;
 183     }
 184
 185     s->ncomponents = ncomponents;
 186
 187     if (s->tile_width <= 0 || s->tile_height <= 0 ||
 188         s->tile_width > s->width || s->tile_height > s->height) {
 189         av_log(s->avctx, AV_LOG_ERROR, "Invalid tile dimension %dx%d.\n",
 190                s->tile_width, s->tile_height);
 191         return AVERROR_INVALIDDATA;
 192     }
 193
 194     if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
 195         return AVERROR_INVALIDDATA;
 196
 197     for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
 198         uint8_t x    = bytestream2_get_byteu(&s->g);
 199         s->cbps[i]   = (x & 0x7f) + 1;
 200         s->precision = FFMAX(s->cbps[i], s->precision);
 201         s->sgnd[i]   = !!(x & 0x80);
 202         s->cdx[i]    = bytestream2_get_byteu(&s->g);
 203         s->cdy[i]    = bytestream2_get_byteu(&s->g);
 204
 205         if (s->cdx[i] != 1 || s->cdy[i] != 1) {
 206             avpriv_request_sample(s->avctx,
 207                                   "CDxy values %d %d for component %d",
 208                                   s->cdx[i], s->cdy[i], i);
 209             if (!s->cdx[i] || !s->cdy[i])
 210                 return AVERROR_INVALIDDATA;
 211             else
 212                 return AVERROR_PATCHWELCOME;
 213         }
 214     }
 215
 216     s->numXtiles = ff_jpeg2000_ceildiv(s->width  - s->tile_offset_x, s->tile_width);
 217     s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);
 218
 219     s->tile = av_mallocz_array(s->numXtiles * s->numYtiles, sizeof(*s->tile));
 220     if (!s->tile) {
 221         s->numXtiles = s->numYtiles = 0;
 222         return AVERROR(ENOMEM);
 223     }
 224
 225     for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
 226         Jpeg2000Tile *tile = s->tile + i;
 227
 228         tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
 229         if (!tile->comp)
 230             return AVERROR(ENOMEM);
 231     }
 232
 233     /* compute image size with reduction factor */
 234     s->avctx->width  = ff_jpeg2000_ceildivpow2(s->width  - s->image_offset_x,
 235                                                s->reduction_factor);
 236     s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
 237                                                s->reduction_factor);
 238
 239     switch (s->avctx->profile) {
 240     case FF_PROFILE_JPEG2000_DCINEMA_2K:
 241     case FF_PROFILE_JPEG2000_DCINEMA_4K:
 242         /* XYZ color-space for digital cinema profiles */
 243         s->avctx->pix_fmt = AV_PIX_FMT_XYZ12;
 244         break;
 245     default:
 246         /* For other profiles selects color-space according number of
 247          * components and bit depth precision. */
 248         switch (s->ncomponents) {
 249         case 1:
 250             if (s->precision > 8)
 251                 s->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
 252             else
 253                 s->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
 254             break;
 255         case 3:
 256             if (s->precision > 8)
 257                 s->avctx->pix_fmt = AV_PIX_FMT_RGB48;
 258             else
 259                 s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
 260             break;
 261         case 4:
 262             s->avctx->pix_fmt = AV_PIX_FMT_BGRA;
 263             break;
 264         default:
 265             /* pixel format can not be identified */
 266             s->avctx->pix_fmt = AV_PIX_FMT_NONE;
 267             break;
 268         }
 269         break;
 270     }
 271     return 0;
 272 }
 273
 274 /* get common part for COD and COC segments */
 275 static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
 276 {
 277     uint8_t byte;
 278
 279     if (bytestream2_get_bytes_left(&s->g) < 5)
 280         return AVERROR_INVALIDDATA;
 281
 282     /*  nreslevels = number of resolution levels
 283                    = number of decomposition level +1 */
 284     c->nreslevels = bytestream2_get_byteu(&s->g) + 1;
 285
 286     if (c->nreslevels > JPEG2000_MAX_RESLEVELS)
 287         return AVERROR_INVALIDDATA;
 288
 289     /* compute number of resolution levels to decode */
 290     if (c->nreslevels < s->reduction_factor)
 291         c->nreslevels2decode = 1;
 292     else
 293         c->nreslevels2decode = c->nreslevels - s->reduction_factor;
 294
 295     c->log2_cblk_width  = bytestream2_get_byteu(&s->g) + 2; // cblk width
 296     c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height
 297
 298     if (c->log2_cblk_width > 10 || c->log2_cblk_height > 10 ||
 299         c->log2_cblk_width + c->log2_cblk_height > 12) {
 300         av_log(s->avctx, AV_LOG_ERROR, "cblk size invalid\n");
 301         return AVERROR_INVALIDDATA;
 302     }
 303
 304     c->cblk_style = bytestream2_get_byteu(&s->g);
 305     if (c->cblk_style != 0) { // cblk style
 306         avpriv_request_sample(s->avctx, "Support for extra cblk styles");
 307         return AVERROR_PATCHWELCOME;
 308     }
 309     c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type
 310     /* set integer 9/7 DWT in case of BITEXACT flag */
 311     if ((s->avctx->flags & CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97))
 312         c->transform = FF_DWT97_INT;
 313
 314     if (c->csty & JPEG2000_CSTY_PREC) {
 315         int i;
 316         for (i = 0; i < c->nreslevels; i++) {
 317             byte = bytestream2_get_byte(&s->g);
 318             c->log2_prec_widths[i]  =  byte       & 0x0F;    // precinct PPx
 319             c->log2_prec_heights[i] = (byte >> 4) & 0x0F;    // precinct PPy
 320         }
 321     } else {
 322         memset(c->log2_prec_widths , 15, sizeof(c->log2_prec_widths ));
 323         memset(c->log2_prec_heights, 15, sizeof(c->log2_prec_heights));
 324     }
 325     return 0;
 326 }
 327
 328 /* get coding parameters for a particular tile or whole image*/
 329 static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 330                    uint8_t *properties)
 331 {
 332     Jpeg2000CodingStyle tmp;
 333     int compno;
 334
 335     if (bytestream2_get_bytes_left(&s->g) < 5)
 336         return AVERROR_INVALIDDATA;
 337
 338     tmp.csty = bytestream2_get_byteu(&s->g);
 339
 340     // get progression order
 341     tmp.prog_order = bytestream2_get_byteu(&s->g);
 342
 343     tmp.nlayers    = bytestream2_get_be16u(&s->g);
 344     tmp.mct        = bytestream2_get_byteu(&s->g); // multiple component transformation
 345
 346     get_cox(s, &tmp);
 347     for (compno = 0; compno < s->ncomponents; compno++)
 348         if (!(properties[compno] & HAD_COC))
 349             memcpy(c + compno, &tmp, sizeof(tmp));
 350     return 0;
 351 }
 352
 353 /* Get coding parameters for a component in the whole image or a
 354  * particular tile. */
 355 static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 356                    uint8_t *properties)
 357 {
 358     int compno;
 359
 360     if (bytestream2_get_bytes_left(&s->g) < 2)
 361         return AVERROR_INVALIDDATA;
 362
 363     compno = bytestream2_get_byteu(&s->g);
 364
 365     if (compno >= s->ncomponents) {
 366         av_log(s->avctx, AV_LOG_ERROR,
 367                "Invalid compno %d. There are %d components in the image.\n",
 368                compno, s->ncomponents);
 369         return AVERROR_INVALIDDATA;
 370     }
 371
 372     c      += compno;
 373     c->csty = bytestream2_get_byteu(&s->g);
 374     get_cox(s, c);
 375
 376     properties[compno] |= HAD_COC;
 377     return 0;
 378 }
 379
 380 /* Get common part for QCD and QCC segments. */
 381 static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
 382 {
 383     int i, x;
 384
 385     if (bytestream2_get_bytes_left(&s->g) < 1)
 386         return AVERROR_INVALIDDATA;
 387
 388     x = bytestream2_get_byteu(&s->g); // Sqcd
 389
 390     q->nguardbits = x >> 5;
 391     q->quantsty   = x & 0x1f;
 392
 393     if (q->quantsty == JPEG2000_QSTY_NONE) {
 394         n -= 3;
 395         if (bytestream2_get_bytes_left(&s->g) < n ||
 396             n > JPEG2000_MAX_DECLEVELS)
 397             return AVERROR_INVALIDDATA;
 398         for (i = 0; i < n; i++)
 399             q->expn[i] = bytestream2_get_byteu(&s->g) >> 3;
 400     } else if (q->quantsty == JPEG2000_QSTY_SI) {
 401         if (bytestream2_get_bytes_left(&s->g) < 2)
 402             return AVERROR_INVALIDDATA;
 403         x          = bytestream2_get_be16u(&s->g);
 404         q->expn[0] = x >> 11;
 405         q->mant[0] = x & 0x7ff;
 406         for (i = 1; i < JPEG2000_MAX_DECLEVELS * 3; i++) {
 407             int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
 408             q->expn[i] = curexpn;
 409             q->mant[i] = q->mant[0];
 410         }
 411     } else {
 412         n = (n - 3) >> 1;
 413         if (bytestream2_get_bytes_left(&s->g) < 2 * n ||
 414             n > JPEG2000_MAX_DECLEVELS)
 415             return AVERROR_INVALIDDATA;
 416         for (i = 0; i < n; i++) {
 417             x          = bytestream2_get_be16u(&s->g);
 418             q->expn[i] = x >> 11;
 419             q->mant[i] = x & 0x7ff;
 420         }
 421     }
 422     return 0;
 423 }
 424
 425 /* Get quantization parameters for a particular tile or a whole image. */
 426 static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 427                    uint8_t *properties)
 428 {
 429     Jpeg2000QuantStyle tmp;
 430     int compno, ret;
 431
 432     if ((ret = get_qcx(s, n, &tmp)) < 0)
 433         return ret;
 434     for (compno = 0; compno < s->ncomponents; compno++)
 435         if (!(properties[compno] & HAD_QCC))
 436             memcpy(q + compno, &tmp, sizeof(tmp));
 437     return 0;
 438 }
 439
 440 /* Get quantization parameters for a component in the whole image
 441  * on in a particular tile. */
 442 static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 443                    uint8_t *properties)
 444 {
 445     int compno;
 446
 447     if (bytestream2_get_bytes_left(&s->g) < 1)
 448         return AVERROR_INVALIDDATA;
 449
 450     compno = bytestream2_get_byteu(&s->g);
 451
 452     if (compno >= s->ncomponents) {
 453         av_log(s->avctx, AV_LOG_ERROR,
 454                "Invalid compno %d. There are %d components in the image.\n",
 455                compno, s->ncomponents);
 456         return AVERROR_INVALIDDATA;
 457     }
 458
 459     properties[compno] |= HAD_QCC;
 460     return get_qcx(s, n - 1, q + compno);
 461 }
 462
 463 /* Get start of tile segment. */
 464 static int get_sot(Jpeg2000DecoderContext *s, int n)
 465 {
 466     Jpeg2000TilePart *tp;
 467     uint16_t Isot;
 468     uint32_t Psot;
 469     uint8_t TPsot;
 470
 471     if (bytestream2_get_bytes_left(&s->g) < 8)
 472         return AVERROR_INVALIDDATA;
 473
 474     Isot = bytestream2_get_be16u(&s->g);        // Isot
 475     if (Isot >= s->numXtiles * s->numYtiles)
 476         return AVERROR_INVALIDDATA;
 477
 478     if (Isot) {
 479         avpriv_request_sample(s->avctx, "Support for more than one tile");
 480         return AVERROR_PATCHWELCOME;
 481     }
 482     Psot  = bytestream2_get_be32u(&s->g);       // Psot
 483     TPsot = bytestream2_get_byteu(&s->g);       // TPsot
 484
 485     /* Read TNSot but not used */
 486     bytestream2_get_byteu(&s->g);               // TNsot
 487
 488     if (Psot > bytestream2_get_bytes_left(&s->g) + n + 2) {
 489         av_log(s->avctx, AV_LOG_ERROR, "Psot %d too big\n", Psot);
 490         return AVERROR_INVALIDDATA;
 491     }
 492
 493     if (TPsot >= FF_ARRAY_ELEMS(s->tile[Isot].tile_part)) {
 494         avpriv_request_sample(s->avctx, "Support for %d components", TPsot);
 495         return AVERROR_PATCHWELCOME;
 496     }
 497
 498     tp             = s->tile[s->curtileno].tile_part + TPsot;
 499     tp->tile_index = Isot;
 500     tp->tp_len     = Psot;
 501     tp->tp_idx     = TPsot;
 502
 503     /* Start of bit stream. Pointer to SOD marker
 504      * Check SOD marker is present. */
 505     if (JPEG2000_SOD == bytestream2_get_be16(&s->g)) {
 506         bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_len - n - 4);
 507         bytestream2_skip(&s->g, tp->tp_len - n - 4);
 508     } else {
 509         av_log(s->avctx, AV_LOG_ERROR, "SOD marker not found \n");
 510         return AVERROR_INVALIDDATA;
 511     }
 512
 513     /* End address of bit stream =
 514      *     start address + (Psot - size of SOT HEADER(n)
 515      *     - size of SOT MARKER(2)  - size of SOD marker(2) */
 516
 517     return 0;
 518 }
 519
 520 /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
 521  * Used to know the number of tile parts and lengths.
 522  * There may be multiple TLMs in the header.
 523  * TODO: The function is not used for tile-parts management, nor anywhere else.
 524  * It can be useful to allocate memory for tile parts, before managing the SOT
 525  * markers. Parsing the TLM header is needed to increment the input header
 526  * buffer.
 527  * This marker is mandatory for DCI. */
 528 static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
 529 {
 530     uint8_t Stlm, ST, SP, tile_tlm, i;
 531     bytestream2_get_byte(&s->g);               /* Ztlm: skipped */
 532     Stlm = bytestream2_get_byte(&s->g);
 533
 534     // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
 535     ST = (Stlm >> 4) & 0x03;
 536     // TODO: Manage case of ST = 0b11 --> raise error
 537     SP       = (Stlm >> 6) & 0x01;
 538     tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
 539     for (i = 0; i < tile_tlm; i++) {
 540         switch (ST) {
 541         case 0:
 542             break;
 543         case 1:
 544             bytestream2_get_byte(&s->g);
 545             break;
 546         case 2:
 547             bytestream2_get_be16(&s->g);
 548             break;
 549         case 3:
 550             bytestream2_get_be32(&s->g);
 551             break;
 552         }
 553         if (SP == 0) {
 554             bytestream2_get_be16(&s->g);
 555         } else {
 556             bytestream2_get_be32(&s->g);
 557         }
 558     }
 559     return 0;
 560 }
 561
 562 static int init_tile(Jpeg2000DecoderContext *s, int tileno)
 563 {
 564     int compno;
 565     int tilex = tileno % s->numXtiles;
 566     int tiley = tileno / s->numXtiles;
 567     Jpeg2000Tile *tile = s->tile + tileno;
 568     Jpeg2000CodingStyle *codsty;
 569     Jpeg2000QuantStyle  *qntsty;
 570
 571     if (!tile->comp)
 572         return AVERROR(ENOMEM);
 573
 574     /* copy codsty, qnsty to tile. TODO: Is it the best way?
 575      * codsty, qnsty is an array of 4 structs Jpeg2000CodingStyle
 576      * and Jpeg2000QuantStyle */
 577     memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(*codsty));
 578     memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(*qntsty));
 579
 580     for (compno = 0; compno < s->ncomponents; compno++) {
 581         Jpeg2000Component *comp = tile->comp + compno;
 582         int ret; // global bandno
 583         codsty = tile->codsty + compno;
 584         qntsty = tile->qntsty + compno;
 585
 586         comp->coord_o[0][0] = FFMAX(tilex       * s->tile_width  + s->tile_offset_x, s->image_offset_x);
 587         comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width  + s->tile_offset_x, s->width);
 588         comp->coord_o[1][0] = FFMAX(tiley       * s->tile_height + s->tile_offset_y, s->image_offset_y);
 589         comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height);
 590
 591         // FIXME: add a dcinema profile check ?
 592         // value is guaranteed by profile (orig=0, 1 tile)
 593         comp->coord[0][0] = 0;
 594         comp->coord[0][1] = s->avctx->width;
 595         comp->coord[1][0] = 0;
 596         comp->coord[1][1] = s->avctx->height;
 597
 598         if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
 599                                              s->cbps[compno], s->cdx[compno],
 600                                              s->cdy[compno], s->avctx))
 601             return ret;
 602     }
 603     return 0;
 604 }
 605
 606 /* Read the number of coding passes. */
 607 static int getnpasses(Jpeg2000DecoderContext *s)
 608 {
 609     int num;
 610     if (!get_bits(s, 1))
 611         return 1;
 612     if (!get_bits(s, 1))
 613         return 2;
 614     if ((num = get_bits(s, 2)) != 3)
 615         return num < 0 ? num : 3 + num;
 616     if ((num = get_bits(s, 5)) != 31)
 617         return num < 0 ? num : 6 + num;
 618     num = get_bits(s, 7);
 619     return num < 0 ? num : 37 + num;
 620 }
 621
 622 static int getlblockinc(Jpeg2000DecoderContext *s)
 623 {
 624     int res = 0, ret;
 625     while (ret = get_bits(s, 1)) {
 626         if (ret < 0)
 627             return ret;
 628         res++;
 629     }
 630     return res;
 631 }
 632
 633 static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s,
 634                                   Jpeg2000CodingStyle *codsty,
 635                                   Jpeg2000ResLevel *rlevel, int precno,
 636                                   int layno, uint8_t *expn, int numgbits)
 637 {
 638     int bandno, cblkno, ret, nb_code_blocks;
 639
 640     if (!(ret = get_bits(s, 1))) {
 641         jpeg2000_flush(s);
 642         return 0;
 643     } else if (ret < 0)
 644         return ret;
 645
 646     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
 647         Jpeg2000Band *band = rlevel->band + bandno;
 648         Jpeg2000Prec *prec = band->prec + precno;
 649
 650         if (band->coord[0][0] == band->coord[0][1] ||
 651             band->coord[1][0] == band->coord[1][1])
 652             continue;
 653         nb_code_blocks =  prec->nb_codeblocks_height *
 654                           prec->nb_codeblocks_width;
 655         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
 656             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
 657             int incl, newpasses, llen;
 658
 659             if (cblk->npasses)
 660                 incl = get_bits(s, 1);
 661             else
 662                 incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno;
 663             if (!incl)
 664                 continue;
 665             else if (incl < 0)
 666                 return incl;
 667
 668             if (!cblk->npasses) {
 669                 int v = expn[bandno] + numgbits - 1 -
 670                         tag_tree_decode(s, prec->zerobits + cblkno, 100);
 671                 if (v < 0) {
 672                     av_log(s->avctx, AV_LOG_ERROR,
 673                            "nonzerobits %d invalid\n", v);
 674                     return AVERROR_INVALIDDATA;
 675                 }
 676                 cblk->nonzerobits = v;
 677             }
 678             if ((newpasses = getnpasses(s)) < 0)
 679                 return newpasses;
 680             if ((llen = getlblockinc(s)) < 0)
 681                 return llen;
 682             cblk->lblock += llen;
 683             if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0)
 684                 return ret;
 685             if (ret > sizeof(cblk->data)) {
 686                 avpriv_request_sample(s->avctx,
 687                                       "Block with lengthinc greater than %zu",
 688                                       sizeof(cblk->data));
 689                 return AVERROR_PATCHWELCOME;
 690             }
 691             cblk->lengthinc = ret;
 692             cblk->npasses  += newpasses;
 693         }
 694     }
 695     jpeg2000_flush(s);
 696
 697     if (codsty->csty & JPEG2000_CSTY_EPH) {
 698         if (bytestream2_peek_be16(&s->g) == JPEG2000_EPH)
 699             bytestream2_skip(&s->g, 2);
 700         else
 701             av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
 702     }
 703
 704     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
 705         Jpeg2000Band *band = rlevel->band + bandno;
 706         Jpeg2000Prec *prec = band->prec + precno;
 707
 708         nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
 709         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
 710             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
 711             if (bytestream2_get_bytes_left(&s->g) < cblk->lengthinc)
 712                 return AVERROR_INVALIDDATA;
 713             /* Code-block data can be empty. In that case initialize data
 714              * with 0xFFFF. */
 715             if (cblk->lengthinc > 0) {
 716                 bytestream2_get_bufferu(&s->g, cblk->data, cblk->lengthinc);
 717             } else {
 718                 cblk->data[0] = 0xFF;
 719                 cblk->data[1] = 0xFF;
 720             }
 721             cblk->length   += cblk->lengthinc;
 722             cblk->lengthinc = 0;
 723         }
 724     }
 725     return 0;
 726 }
 727
 728 static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
 729 {
 730     int layno, reslevelno, compno, precno, ok_reslevel, ret;
 731     uint8_t prog_order = tile->codsty[0].prog_order;
 732     uint16_t x;
 733     uint16_t y;
 734
 735     s->bit_index = 8;
 736     switch (prog_order) {
 737     case JPEG2000_PGOD_LRCP:
 738         for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
 739             ok_reslevel = 1;
 740             for (reslevelno = 0; ok_reslevel; reslevelno++) {
 741                 ok_reslevel = 0;
 742                 for (compno = 0; compno < s->ncomponents; compno++) {
 743                     Jpeg2000CodingStyle *codsty = tile->codsty + compno;
 744                     Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
 745                     if (reslevelno < codsty->nreslevels) {
 746                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
 747                                                    reslevelno;
 748                         ok_reslevel = 1;
 749                         for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
 750                             if ((ret = jpeg2000_decode_packet(s,
 751                                                               codsty, rlevel,
 752                                                               precno, layno,
 753                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
 754                                                               qntsty->nguardbits)) < 0)
 755                                 return ret;
 756                     }
 757                 }
 758             }
 759         }
 760         break;
 761
 762     case JPEG2000_PGOD_CPRL:
 763         for (compno = 0; compno < s->ncomponents; compno++) {
 764             Jpeg2000CodingStyle *codsty = tile->codsty + compno;
 765             Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
 766
 767             /* Set bit stream buffer address according to tile-part.
 768              * For DCinema one tile-part per component, so can be
 769              * indexed by component. */
 770             s->g = tile->tile_part[compno].tpg;
 771
 772             /* Position loop (y axis)
 773              * TODO: Automate computing of step 256.
 774              * Fixed here, but to be computed before entering here. */
 775             for (y = 0; y < s->height; y += 256) {
 776                 /* Position loop (y axis)
 777                  * TODO: automate computing of step 256.
 778                  * Fixed here, but to be computed before entering here. */
 779                 for (x = 0; x < s->width; x += 256) {
 780                     for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {
 781                         uint16_t prcx, prcy;
 782                         uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
 783                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
 784
 785                         if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) ||
 786                               (y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
 787                             continue;
 788
 789                         if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) ||
 790                               (x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema
 791                             continue;
 792
 793                         // check if a precinct exists
 794                         prcx   = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width;
 795                         prcy   = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height;
 796                         precno = prcx + rlevel->num_precincts_x * prcy;
 797                         for (layno = 0; layno < tile->codsty[0].nlayers; layno++) {
 798                             if ((ret = jpeg2000_decode_packet(s, codsty, rlevel,
 799                                                               precno, layno,
 800                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
 801                                                               qntsty->nguardbits)) < 0)
 802                                 return ret;
 803                         }
 804                     }
 805                 }
 806             }
 807         }
 808         break;
 809
 810     default:
 811         break;
 812     }
 813
 814     /* EOC marker reached */
 815     bytestream2_skip(&s->g, 2);
 816
 817     return 0;
 818 }
 819
 820 /* TIER-1 routines */
 821 static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
 822                            int bpno, int bandno)
 823 {
 824     int mask = 3 << (bpno - 1), y0, x, y;
 825
 826     for (y0 = 0; y0 < height; y0 += 4)
 827         for (x = 0; x < width; x++)
 828             for (y = y0; y < height && y < y0 + 4; y++)
 829                 if ((t1->flags[y + 1][x + 1] & JPEG2000_T1_SIG_NB)
 830                     && !(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
 831                     if (ff_mqc_decode(&t1->mqc,
 832                                       t1->mqc.cx_states +
 833                                       ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
 834                                                              bandno))) {
 835                         int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
 836                                                                     &xorbit);
 837
 838                         t1->data[y][x] =
 839                             (ff_mqc_decode(&t1->mqc,
 840                                            t1->mqc.cx_states + ctxno) ^ xorbit)
 841                             ? -mask : mask;
 842
 843                         ff_jpeg2000_set_significance(t1, x, y,
 844                                                      t1->data[y][x] < 0);
 845                     }
 846                     t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS;
 847                 }
 848 }
 849
 850 static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
 851                            int bpno)
 852 {
 853     int phalf, nhalf;
 854     int y0, x, y;
 855
 856     phalf = 1 << (bpno - 1);
 857     nhalf = -phalf;
 858
 859     for (y0 = 0; y0 < height; y0 += 4)
 860         for (x = 0; x < width; x++)
 861             for (y = y0; y < height && y < y0 + 4; y++)
 862                 if ((t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
 863                     int ctxno = ff_jpeg2000_getrefctxno(t1->flags[y + 1][x + 1]);
 864                     int r     = ff_mqc_decode(&t1->mqc,
 865                                               t1->mqc.cx_states + ctxno)
 866                                 ? phalf : nhalf;
 867                     t1->data[y][x]          += t1->data[y][x] < 0 ? -r : r;
 868                     t1->flags[y + 1][x + 1] |= JPEG2000_T1_REF;
 869                 }
 870 }
 871
 872 static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
 873                            int width, int height, int bpno, int bandno,
 874                            int seg_symbols)
 875 {
 876     int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
 877
 878     for (y0 = 0; y0 < height; y0 += 4)
 879         for (x = 0; x < width; x++) {
 880             if (y0 + 3 < height &&
 881                 !((t1->flags[y0 + 1][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 882                   (t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 883                   (t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
 884                   (t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)))) {
 885                 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
 886                     continue;
 887                 runlen = ff_mqc_decode(&t1->mqc,
 888                                        t1->mqc.cx_states + MQC_CX_UNI);
 889                 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc,
 890                                                        t1->mqc.cx_states +
 891                                                        MQC_CX_UNI);
 892                 dec = 1;
 893             } else {
 894                 runlen = 0;
 895                 dec    = 0;
 896             }
 897
 898             for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
 899                 if (!dec) {
 900                     if (!(t1->flags[y + 1][x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)))
 901                         dec = ff_mqc_decode(&t1->mqc,
 902                                             t1->mqc.cx_states +
 903                                             ff_jpeg2000_getsigctxno(t1->flags[y + 1][x + 1],
 904                                                                    bandno));
 905                 }
 906                 if (dec) {
 907                     int xorbit;
 908                     int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[y + 1][x + 1],
 909                                                         &xorbit);
 910                     t1->data[y][x] = (ff_mqc_decode(&t1->mqc,
 911                                                     t1->mqc.cx_states + ctxno) ^
 912                                       xorbit)
 913                                      ? -mask : mask;
 914                     ff_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0);
 915                 }
 916                 dec = 0;
 917                 t1->flags[y + 1][x + 1] &= ~JPEG2000_T1_VIS;
 918             }
 919         }
 920     if (seg_symbols) {
 921         int val;
 922         val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 923         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 924         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 925         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
 926         if (val != 0xa)
 927             av_log(s->avctx, AV_LOG_ERROR,
 928                    "Segmentation symbol value incorrect\n");
 929     }
 930 }
 931
 932 static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
 933                        Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
 934                        int width, int height, int bandpos)
 935 {
 936     int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
 937
 938     for (y = 0; y < height; y++)
 939         memset(t1->data[y], 0, width * sizeof(width));
 940     /* If code-block contains no compressed data: nothing to do. */
 941     if (!cblk->length)
 942         return 0;
 943     for (y = 0; y < height + 2; y++)
 944         memset(t1->flags[y], 0, (width + 2) * sizeof(width));
 945
 946     ff_mqc_initdec(&t1->mqc, cblk->data);
 947     cblk->data[cblk->length]     = 0xff;
 948     cblk->data[cblk->length + 1] = 0xff;
 949
 950     while (passno--) {
 951         switch (pass_t) {
 952         case 0:
 953             decode_sigpass(t1, width, height, bpno + 1, bandpos);
 954             break;
 955         case 1:
 956             decode_refpass(t1, width, height, bpno + 1);
 957             break;
 958         case 2:
 959             decode_clnpass(s, t1, width, height, bpno + 1, bandpos,
 960                            codsty->cblk_style & JPEG2000_CBLK_SEGSYM);
 961             break;
 962         }
 963
 964         pass_t++;
 965         if (pass_t == 3) {
 966             bpno--;
 967             pass_t = 0;
 968         }
 969     }
 970     return 0;
 971 }
 972
 973 /* TODO: Verify dequantization for lossless case
 974  * comp->data can be float or int
 975  * band->stepsize can be float or int
 976  * depending on the type of DWT transformation.
 977  * see ISO/IEC 15444-1:2002 A.6.1 */
 978
 979 /* Float dequantization of a codeblock.*/
 980 static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
 981                                  Jpeg2000Component *comp,
 982                                  Jpeg2000T1Context *t1, Jpeg2000Band *band)
 983 {
 984     int i, j, idx;
 985     float *datap = &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
 986     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
 987         for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
 988             idx        = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
 989             datap[idx] = (float)(t1->data[j][i]) * ((float)band->stepsize);
 990         }
 991     return;
 992 }
 993
 994 /* Integer dequantization of a codeblock.*/
 995 static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
 996                                Jpeg2000Component *comp,
 997                                Jpeg2000T1Context *t1, Jpeg2000Band *band)
 998 {
 999     int i, j, idx;
1000     int32_t *datap =
1001         (int32_t *) &comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
1002     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
1003         for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
1004             idx        = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
1005             datap[idx] =
1006                 ((int32_t)(t1->data[j][i]) * ((int32_t)band->stepsize) + (1 << 15)) >> 16;
1007         }
1008     return;
1009 }
1010
1011 /* Inverse ICT parameters in float and integer.
1012  * int value = (float value) * (1<<16) */
1013 static const float f_ict_params[4] = {
1014     1.402f,
1015     0.34413f,
1016     0.71414f,
1017     1.772f
1018 };
1019 static const int   i_ict_params[4] = {
1020      91881,
1021      22553,
1022      46802,
1023     116130
1024 };
1025
1026 static int mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
1027 {
1028     int i, csize = 1;
1029     int ret = 0;
1030     int32_t *src[3],  i0,  i1,  i2;
1031     float   *srcf[3], i0f, i1f, i2f;
1032
1033     for (i = 0; i < 3; i++)
1034         if (tile->codsty[0].transform == FF_DWT97)
1035             srcf[i] = tile->comp[i].data;
1036         else
1037             src[i] = (int32_t *)tile->comp[i].data;
1038
1039     for (i = 0; i < 2; i++)
1040         csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
1041     switch (tile->codsty[0].transform) {
1042     case FF_DWT97:
1043         for (i = 0; i < csize; i++) {
1044             i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
1045             i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
1046                            - (f_ict_params[2] * *srcf[2]);
1047             i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
1048             *srcf[0]++ = i0f;
1049             *srcf[1]++ = i1f;
1050             *srcf[2]++ = i2f;
1051         }
1052         break;
1053     case FF_DWT97_INT:
1054         for (i = 0; i < csize; i++) {
1055             i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
1056             i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
1057                          - (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
1058             i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
1059             *src[0]++ = i0;
1060             *src[1]++ = i1;
1061             *src[2]++ = i2;
1062         }
1063         break;
1064     case FF_DWT53:
1065         for (i = 0; i < csize; i++) {
1066             i1 = *src[0] - (*src[2] + *src[1] >> 2);
1067             i0 = i1 + *src[2];
1068             i2 = i1 + *src[1];
1069             *src[0]++ = i0;
1070             *src[1]++ = i1;
1071             *src[2]++ = i2;
1072         }
1073         break;
1074     }
1075     return ret;
1076 }
1077
1078 static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
1079                                 AVFrame *picture)
1080 {
1081     int compno, reslevelno, bandno;
1082     int x, y;
1083
1084     uint8_t *line;
1085     Jpeg2000T1Context t1;
1086     /* Loop on tile components */
1087
1088     for (compno = 0; compno < s->ncomponents; compno++) {
1089         Jpeg2000Component *comp     = tile->comp + compno;
1090         Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1091         /* Loop on resolution levels */
1092         for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
1093             Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1094             /* Loop on bands */
1095             for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1096                 uint16_t nb_precincts, precno;
1097                 Jpeg2000Band *band = rlevel->band + bandno;
1098                 int cblkno = 0, bandpos;
1099                 bandpos = bandno + (reslevelno > 0);
1100
1101                 nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
1102                 /* Loop on precincts */
1103                 for (precno = 0; precno < nb_precincts; precno++) {
1104                     Jpeg2000Prec *prec = band->prec + precno;
1105
1106                     /* Loop on codeblocks */
1107                     for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) {
1108                         int x, y;
1109                         Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1110                         decode_cblk(s, codsty, &t1, cblk,
1111                                     cblk->coord[0][1] - cblk->coord[0][0],
1112                                     cblk->coord[1][1] - cblk->coord[1][0],
1113                                     bandpos);
1114
1115                         /* Manage band offsets */
1116                         x = cblk->coord[0][0];
1117                         y = cblk->coord[1][0];
1118                         if ((reslevelno > 0) && ((bandno + 1) & 1)) {
1119                             Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1120                             x += pres->coord[0][1] - pres->coord[0][0];
1121                         }
1122                         if ((reslevelno > 0) && ((bandno + 1) & 2)) {
1123                             Jpeg2000ResLevel *pres = comp->reslevel + (reslevelno - 1);
1124                             y += pres->coord[1][1] - pres->coord[1][0];
1125                         }
1126
1127                         if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1128                             dequantization_int(x, y, cblk, comp, &t1, band);
1129                         else
1130                             dequantization_float(x, y, cblk, comp, &t1, band);
1131                    } /* end cblk */
1132                 } /*end prec */
1133             } /* end band */
1134         } /* end reslevel */
1135
1136         /* inverse DWT */
1137         ff_dwt_decode(&comp->dwt, comp->data);
1138     } /*end comp */
1139
1140     /* inverse MCT transformation */
1141     if (tile->codsty[0].mct)
1142         mct_decode(s, tile);
1143
1144     if (s->avctx->pix_fmt == AV_PIX_FMT_BGRA) // RGBA -> BGRA
1145         FFSWAP(float *, tile->comp[0].data, tile->comp[2].data);
1146
1147     if (s->precision <= 8) {
1148         for (compno = 0; compno < s->ncomponents; compno++) {
1149             Jpeg2000Component *comp = tile->comp + compno;
1150             int32_t *datap = (int32_t *)comp->data;
1151             y    = tile->comp[compno].coord[1][0] - s->image_offset_y;
1152             line = picture->data[0] + y * picture->linesize[0];
1153             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1154                 uint8_t *dst;
1155
1156                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
1157                 dst = line + x * s->ncomponents + compno;
1158
1159                 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
1160                     *datap += 1 << (s->cbps[compno] - 1);
1161                     if (*datap < 0)
1162                         *datap = 0;
1163                     else if (*datap >= (1 << s->cbps[compno]))
1164                         *datap = (1 << s->cbps[compno]) - 1;
1165                     *dst = *datap++;
1166                     dst += s->ncomponents;
1167                 }
1168                 line += picture->linesize[0];
1169             }
1170         }
1171     } else {
1172         for (compno = 0; compno < s->ncomponents; compno++) {
1173             Jpeg2000Component *comp = tile->comp + compno;
1174             float *datap = comp->data;
1175             int32_t *i_datap = (int32_t *) comp->data;
1176             uint16_t *linel;
1177
1178             y     = tile->comp[compno].coord[1][0] - s->image_offset_y;
1179             linel = (uint16_t *)picture->data[0] + y * (picture->linesize[0] >> 1);
1180             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
1181                 uint16_t *dst;
1182                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x;
1183                 dst = linel + (x * s->ncomponents + compno);
1184                 for (; x < s->avctx->width; x += s->cdx[compno]) {
1185                     int16_t val;
1186                     /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
1187                     if (s->avctx->flags & CODEC_FLAG_BITEXACT)
1188                         val = *i_datap + (1 << (s->cbps[compno] - 1));
1189                     else
1190                         val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
1191                     val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
1192                     /* align 12 bit values in little-endian mode */
1193                     *dst = val << 4;
1194                     datap++;
1195                     i_datap++;
1196                     dst += s->ncomponents;
1197                 }
1198                 linel += picture->linesize[0] >> 1;
1199             }
1200         }
1201     }
1202     return 0;
1203 }
1204
1205 static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
1206 {
1207     int tileno, compno;
1208     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1209         for (compno = 0; compno < s->ncomponents; compno++) {
1210             Jpeg2000Component *comp     = s->tile[tileno].comp   + compno;
1211             Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno;
1212
1213             ff_jpeg2000_cleanup(comp, codsty);
1214         }
1215         av_freep(&s->tile[tileno].comp);
1216     }
1217     av_freep(&s->tile);
1218 }
1219
1220 static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
1221 {
1222     Jpeg2000CodingStyle *codsty = s->codsty;
1223     Jpeg2000QuantStyle *qntsty  = s->qntsty;
1224     uint8_t *properties         = s->properties;
1225
1226     for (;;) {
1227         int len, ret = 0;
1228         uint16_t marker;
1229         int oldpos;
1230
1231         if (bytestream2_get_bytes_left(&s->g) < 2) {
1232             av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
1233             break;
1234         }
1235
1236         marker = bytestream2_get_be16u(&s->g);
1237         oldpos = bytestream2_tell(&s->g);
1238
1239         if (marker == JPEG2000_EOC)
1240             break;
1241
1242         len = bytestream2_get_be16u(&s->g);
1243         if (len < 2 || bytestream2_get_bytes_left(&s->g) < len - 2)
1244             return AVERROR_INVALIDDATA;
1245
1246         switch (marker) {
1247         case JPEG2000_SIZ:
1248             ret = get_siz(s);
1249             break;
1250         case JPEG2000_COC:
1251             ret = get_coc(s, codsty, properties);
1252             break;
1253         case JPEG2000_COD:
1254             ret = get_cod(s, codsty, properties);
1255             break;
1256         case JPEG2000_QCC:
1257             ret = get_qcc(s, len, qntsty, properties);
1258             break;
1259         case JPEG2000_QCD:
1260             ret = get_qcd(s, len, qntsty, properties);
1261             break;
1262         case JPEG2000_SOT:
1263             ret = get_sot(s, len);
1264             break;
1265         case JPEG2000_COM:
1266             // the comment is ignored
1267             bytestream2_skip(&s->g, len - 2);
1268             break;
1269         case JPEG2000_TLM:
1270             // Tile-part lengths
1271             ret = get_tlm(s, len);
1272             break;
1273         default:
1274             av_log(s->avctx, AV_LOG_ERROR,
1275                    "unsupported marker 0x%.4X at pos 0x%X\n",
1276                    marker, bytestream2_tell(&s->g) - 4);
1277             bytestream2_skip(&s->g, len - 2);
1278             break;
1279         }
1280         if (((bytestream2_tell(&s->g) - oldpos != len) && (marker != JPEG2000_SOT)) || ret) {
1281             av_log(s->avctx, AV_LOG_ERROR,
1282                    "error during processing marker segment %.4x\n", marker);
1283             return ret ? ret : -1;
1284         }
1285     }
1286     return 0;
1287 }
1288
1289 /* Read bit stream packets --> T2 operation. */
1290 static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
1291 {
1292     int ret = 0;
1293     Jpeg2000Tile *tile = s->tile + s->curtileno;
1294
1295     if (ret = init_tile(s, s->curtileno))
1296         return ret;
1297     if (ret = jpeg2000_decode_packets(s, tile))
1298         return ret;
1299
1300     return 0;
1301 }
1302
1303 static int jp2_find_codestream(Jpeg2000DecoderContext *s)
1304 {
1305     uint32_t atom_size, atom;
1306     int found_codestream = 0, search_range = 10;
1307
1308     while(!found_codestream && search_range
1309           &&
1310           bytestream2_get_bytes_left(&s->g) >= 8) {
1311         atom_size = bytestream2_get_be32u(&s->g);
1312         atom      = bytestream2_get_be32u(&s->g);
1313         if (atom == JP2_CODESTREAM) {
1314             found_codestream = 1;
1315         } else {
1316             if (bytestream2_get_bytes_left(&s->g) < atom_size - 8)
1317                 return 0;
1318             bytestream2_skipu(&s->g, atom_size - 8);
1319             search_range--;
1320         }
1321     }
1322
1323     if (found_codestream)
1324         return 1;
1325     return 0;
1326 }
1327
1328 static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
1329                                  int *got_frame, AVPacket *avpkt)
1330 {
1331     Jpeg2000DecoderContext *s = avctx->priv_data;
1332     ThreadFrame frame = { .f = data };
1333     AVFrame *picture = data;
1334     int tileno, ret;
1335
1336     s->avctx     = avctx;
1337     bytestream2_init(&s->g, avpkt->data, avpkt->size);
1338     s->curtileno = 0; // TODO: only one tile in DCI JP2K. to implement for more tiles
1339
1340     // reduction factor, i.e number of resolution levels to skip
1341     s->reduction_factor = s->lowres;
1342
1343     if (bytestream2_get_bytes_left(&s->g) < 2)
1344         return AVERROR_INVALIDDATA;
1345
1346     // check if the image is in jp2 format
1347     if (bytestream2_get_bytes_left(&s->g) >= 12 &&
1348        (bytestream2_get_be32u(&s->g) == 12) &&
1349        (bytestream2_get_be32u(&s->g) == JP2_SIG_TYPE) &&
1350        (bytestream2_get_be32u(&s->g) == JP2_SIG_VALUE)) {
1351         if (!jp2_find_codestream(s)) {
1352             av_log(avctx, AV_LOG_ERROR,
1353                    "Could not find Jpeg2000 codestream atom.\n");
1354             return AVERROR_INVALIDDATA;
1355         }
1356     } else {
1357         bytestream2_seek(&s->g, 0, SEEK_SET);
1358         if (bytestream2_peek_be16(&s->g) != JPEG2000_SOC)
1359             bytestream2_skip(&s->g, 8);
1360     }
1361
1362     if (bytestream2_get_be16u(&s->g) != JPEG2000_SOC) {
1363         av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
1364         return AVERROR_INVALIDDATA;
1365     }
1366     if (ret = jpeg2000_read_main_headers(s))
1367         goto end;
1368
1369     /* get picture buffer */
1370     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) {
1371         av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed.\n");
1372         goto end;
1373     }
1374     picture->pict_type = AV_PICTURE_TYPE_I;
1375     picture->key_frame = 1;
1376
1377     if (ret = jpeg2000_read_bitstream_packets(s))
1378         goto end;
1379     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
1380         if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
1381             goto end;
1382
1383     *got_frame = 1;
1384
1385     return bytestream2_tell(&s->g);
1386
1387 end:
1388     jpeg2000_dec_cleanup(s);
1389     return ret;
1390 }
1391
1392 static void jpeg2000_init_static_data(AVCodec *codec)
1393 {
1394     ff_jpeg2000_init_tier1_luts();
1395 }
1396
1397 #define OFFSET(x) offsetof(Jpeg2000DecoderContext, x)
1398 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
1399
1400 static const AVOption options[] = {
1401     { "lowres",  "Lower the decoding resolution by a power of two",
1402         OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
1403     { NULL },
1404 };
1405
1406 static const AVProfile profiles[] = {
1407     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0,  "JPEG 2000 codestream restriction 0"   },
1408     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1,  "JPEG 2000 codestream restriction 1"   },
1409     { FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
1410     { FF_PROFILE_JPEG2000_DCINEMA_2K,             "JPEG 2000 digital cinema 2K"          },
1411     { FF_PROFILE_JPEG2000_DCINEMA_4K,             "JPEG 2000 digital cinema 4K"          },
1412     { FF_PROFILE_UNKNOWN },
1413 };
1414
1415 static const AVClass class = {
1416     .class_name = "jpeg2000",
1417     .item_name  = av_default_item_name,
1418     .option     = options,
1419     .version    = LIBAVUTIL_VERSION_INT,
1420 };
1421
1422 AVCodec ff_jpeg2000_decoder = {
1423     .name             = "jpeg2000",
1424     .long_name        = NULL_IF_CONFIG_SMALL("JPEG 2000"),
1425     .type             = AVMEDIA_TYPE_VIDEO,
1426     .id               = AV_CODEC_ID_JPEG2000,
1427     .capabilities     = CODEC_CAP_FRAME_THREADS,
1428     .priv_data_size   = sizeof(Jpeg2000DecoderContext),
1429     .init_static_data = jpeg2000_init_static_data,
1430     .decode           = jpeg2000_decode_frame,
1431     .priv_class       = &class,
1432     .pix_fmts         = (enum AVPixelFormat[]) { AV_PIX_FMT_XYZ12,
1433                                                  AV_PIX_FMT_GRAY8,
1434                                                  -1 },
1435     .profiles         = NULL_IF_CONFIG_SMALL(profiles)
1436 };