git.sesse.net Git - ffmpeg/blob - 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 FFmpeg.
   7  *
   8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 <inttypes.h>
  29
  30 #include "libavutil/attributes.h"
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/common.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/pixdesc.h"
  35 #include "avcodec.h"
  36 #include "bytestream.h"
  37 #include "internal.h"
  38 #include "thread.h"
  39 #include "jpeg2000.h"
  40 #include "jpeg2000dsp.h"
  41
  42 #define JP2_SIG_TYPE    0x6A502020
  43 #define JP2_SIG_VALUE   0x0D0A870A
  44 #define JP2_CODESTREAM  0x6A703263
  45 #define JP2_HEADER      0x6A703268
  46
  47 #define HAD_COC 0x01
  48 #define HAD_QCC 0x02
  49
  50 #define MAX_POCS 32
  51
  52 typedef struct Jpeg2000POCEntry {
  53     uint16_t LYEpoc;
  54     uint16_t CSpoc;
  55     uint16_t CEpoc;
  56     uint8_t RSpoc;
  57     uint8_t REpoc;
  58     uint8_t Ppoc;
  59 } Jpeg2000POCEntry;
  60
  61 typedef struct Jpeg2000POC {
  62     Jpeg2000POCEntry poc[MAX_POCS];
  63     int nb_poc;
  64     int is_default;
  65 } Jpeg2000POC;
  66
  67 typedef struct Jpeg2000TilePart {
  68     uint8_t tile_index;                 // Tile index who refers the tile-part
  69     const uint8_t *tp_end;
  70     GetByteContext tpg;                 // bit stream in tile-part
  71 } Jpeg2000TilePart;
  72
  73 /* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile
  74  * one per component, so tile_part elements have a size of 3 */
  75 typedef struct Jpeg2000Tile {
  76     Jpeg2000Component   *comp;
  77     uint8_t             properties[4];
  78     Jpeg2000CodingStyle codsty[4];
  79     Jpeg2000QuantStyle  qntsty[4];
  80     Jpeg2000POC         poc;
  81     Jpeg2000TilePart    tile_part[256];
  82     uint16_t tp_idx;                    // Tile-part index
  83     int coord[2][2];                    // border coordinates {{x0, x1}, {y0, y1}}
  84 } Jpeg2000Tile;
  85
  86 typedef struct Jpeg2000DecoderContext {
  87     AVClass         *class;
  88     AVCodecContext  *avctx;
  89     GetByteContext  g;
  90
  91     int             width, height;
  92     int             image_offset_x, image_offset_y;
  93     int             tile_offset_x, tile_offset_y;
  94     uint8_t         cbps[4];    // bits per sample in particular components
  95     uint8_t         sgnd[4];    // if a component is signed
  96     uint8_t         properties[4];
  97     int             cdx[4], cdy[4];
  98     int             precision;
  99     int             ncomponents;
 100     int             colour_space;
 101     uint32_t        palette[256];
 102     int8_t          pal8;
 103     int             cdef[4];
 104     int             tile_width, tile_height;
 105     unsigned        numXtiles, numYtiles;
 106     int             maxtilelen;
 107
 108     Jpeg2000CodingStyle codsty[4];
 109     Jpeg2000QuantStyle  qntsty[4];
 110     Jpeg2000POC         poc;
 111
 112     int             bit_index;
 113
 114     int             curtileno;
 115
 116     Jpeg2000Tile    *tile;
 117     Jpeg2000DSPContext dsp;
 118
 119     /*options parameters*/
 120     int             reduction_factor;
 121 } Jpeg2000DecoderContext;
 122
 123 /* get_bits functions for JPEG2000 packet bitstream
 124  * It is a get_bit function with a bit-stuffing routine. If the value of the
 125  * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB.
 126  * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */
 127 static int get_bits(Jpeg2000DecoderContext *s, int n)
 128 {
 129     int res = 0;
 130
 131     while (--n >= 0) {
 132         res <<= 1;
 133         if (s->bit_index == 0) {
 134             s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu);
 135         }
 136         s->bit_index--;
 137         res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1;
 138     }
 139     return res;
 140 }
 141
 142 static void jpeg2000_flush(Jpeg2000DecoderContext *s)
 143 {
 144     if (bytestream2_get_byte(&s->g) == 0xff)
 145         bytestream2_skip(&s->g, 1);
 146     s->bit_index = 8;
 147 }
 148
 149 /* decode the value stored in node */
 150 static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node,
 151                            int threshold)
 152 {
 153     Jpeg2000TgtNode *stack[30];
 154     int sp = -1, curval = 0;
 155
 156     if (!node) {
 157         av_log(s->avctx, AV_LOG_ERROR, "missing node\n");
 158         return AVERROR_INVALIDDATA;
 159     }
 160
 161     while (node && !node->vis) {
 162         stack[++sp] = node;
 163         node        = node->parent;
 164     }
 165
 166     if (node)
 167         curval = node->val;
 168     else
 169         curval = stack[sp]->val;
 170
 171     while (curval < threshold && sp >= 0) {
 172         if (curval < stack[sp]->val)
 173             curval = stack[sp]->val;
 174         while (curval < threshold) {
 175             int ret;
 176             if ((ret = get_bits(s, 1)) > 0) {
 177                 stack[sp]->vis++;
 178                 break;
 179             } else if (!ret)
 180                 curval++;
 181             else
 182                 return ret;
 183         }
 184         stack[sp]->val = curval;
 185         sp--;
 186     }
 187     return curval;
 188 }
 189
 190 static int pix_fmt_match(enum AVPixelFormat pix_fmt, int components,
 191                          int bpc, uint32_t log2_chroma_wh, int pal8)
 192 {
 193     int match = 1;
 194     const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(pix_fmt);
 195
 196     av_assert2(desc);
 197
 198     if (desc->nb_components != components) {
 199         return 0;
 200     }
 201
 202     switch (components) {
 203     case 4:
 204         match = match && desc->comp[3].depth >= bpc &&
 205                          (log2_chroma_wh >> 14 & 3) == 0 &&
 206                          (log2_chroma_wh >> 12 & 3) == 0;
 207     case 3:
 208         match = match && desc->comp[2].depth >= bpc &&
 209                          (log2_chroma_wh >> 10 & 3) == desc->log2_chroma_w &&
 210                          (log2_chroma_wh >>  8 & 3) == desc->log2_chroma_h;
 211     case 2:
 212         match = match && desc->comp[1].depth >= bpc &&
 213                          (log2_chroma_wh >>  6 & 3) == desc->log2_chroma_w &&
 214                          (log2_chroma_wh >>  4 & 3) == desc->log2_chroma_h;
 215
 216     case 1:
 217         match = match && desc->comp[0].depth >= bpc &&
 218                          (log2_chroma_wh >>  2 & 3) == 0 &&
 219                          (log2_chroma_wh       & 3) == 0 &&
 220                          (desc->flags & AV_PIX_FMT_FLAG_PAL) == pal8 * AV_PIX_FMT_FLAG_PAL;
 221     }
 222     return match;
 223 }
 224
 225 // pix_fmts with lower bpp have to be listed before
 226 // similar pix_fmts with higher bpp.
 227 #define RGB_PIXEL_FORMATS   AV_PIX_FMT_PAL8,AV_PIX_FMT_RGB24,AV_PIX_FMT_RGBA,AV_PIX_FMT_RGB48,AV_PIX_FMT_RGBA64
 228 #define GRAY_PIXEL_FORMATS  AV_PIX_FMT_GRAY8,AV_PIX_FMT_GRAY8A,AV_PIX_FMT_GRAY16,AV_PIX_FMT_YA16
 229 #define YUV_PIXEL_FORMATS   AV_PIX_FMT_YUV410P,AV_PIX_FMT_YUV411P,AV_PIX_FMT_YUVA420P, \
 230                             AV_PIX_FMT_YUV420P,AV_PIX_FMT_YUV422P,AV_PIX_FMT_YUVA422P, \
 231                             AV_PIX_FMT_YUV440P,AV_PIX_FMT_YUV444P,AV_PIX_FMT_YUVA444P, \
 232                             AV_PIX_FMT_YUV420P9,AV_PIX_FMT_YUV422P9,AV_PIX_FMT_YUV444P9, \
 233                             AV_PIX_FMT_YUVA420P9,AV_PIX_FMT_YUVA422P9,AV_PIX_FMT_YUVA444P9, \
 234                             AV_PIX_FMT_YUV420P10,AV_PIX_FMT_YUV422P10,AV_PIX_FMT_YUV444P10, \
 235                             AV_PIX_FMT_YUVA420P10,AV_PIX_FMT_YUVA422P10,AV_PIX_FMT_YUVA444P10, \
 236                             AV_PIX_FMT_YUV420P12,AV_PIX_FMT_YUV422P12,AV_PIX_FMT_YUV444P12, \
 237                             AV_PIX_FMT_YUV420P14,AV_PIX_FMT_YUV422P14,AV_PIX_FMT_YUV444P14, \
 238                             AV_PIX_FMT_YUV420P16,AV_PIX_FMT_YUV422P16,AV_PIX_FMT_YUV444P16, \
 239                             AV_PIX_FMT_YUVA420P16,AV_PIX_FMT_YUVA422P16,AV_PIX_FMT_YUVA444P16
 240 #define XYZ_PIXEL_FORMATS   AV_PIX_FMT_XYZ12
 241
 242 static const enum AVPixelFormat rgb_pix_fmts[]  = {RGB_PIXEL_FORMATS};
 243 static const enum AVPixelFormat gray_pix_fmts[] = {GRAY_PIXEL_FORMATS};
 244 static const enum AVPixelFormat yuv_pix_fmts[]  = {YUV_PIXEL_FORMATS};
 245 static const enum AVPixelFormat xyz_pix_fmts[]  = {XYZ_PIXEL_FORMATS,
 246                                                    YUV_PIXEL_FORMATS};
 247 static const enum AVPixelFormat all_pix_fmts[]  = {RGB_PIXEL_FORMATS,
 248                                                    GRAY_PIXEL_FORMATS,
 249                                                    YUV_PIXEL_FORMATS,
 250                                                    XYZ_PIXEL_FORMATS};
 251
 252 /* marker segments */
 253 /* get sizes and offsets of image, tiles; number of components */
 254 static int get_siz(Jpeg2000DecoderContext *s)
 255 {
 256     int i;
 257     int ncomponents;
 258     uint32_t log2_chroma_wh = 0;
 259     const enum AVPixelFormat *possible_fmts = NULL;
 260     int possible_fmts_nb = 0;
 261
 262     if (bytestream2_get_bytes_left(&s->g) < 36) {
 263         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for SIZ\n");
 264         return AVERROR_INVALIDDATA;
 265     }
 266
 267     s->avctx->profile = bytestream2_get_be16u(&s->g); // Rsiz
 268     s->width          = bytestream2_get_be32u(&s->g); // Width
 269     s->height         = bytestream2_get_be32u(&s->g); // Height
 270     s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
 271     s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
 272     s->tile_width     = bytestream2_get_be32u(&s->g); // XTSiz
 273     s->tile_height    = bytestream2_get_be32u(&s->g); // YTSiz
 274     s->tile_offset_x  = bytestream2_get_be32u(&s->g); // XT0Siz
 275     s->tile_offset_y  = bytestream2_get_be32u(&s->g); // YT0Siz
 276     ncomponents       = bytestream2_get_be16u(&s->g); // CSiz
 277
 278     if (s->image_offset_x || s->image_offset_y) {
 279         avpriv_request_sample(s->avctx, "Support for image offsets");
 280         return AVERROR_PATCHWELCOME;
 281     }
 282
 283     if (ncomponents <= 0) {
 284         av_log(s->avctx, AV_LOG_ERROR, "Invalid number of components: %d\n",
 285                s->ncomponents);
 286         return AVERROR_INVALIDDATA;
 287     }
 288
 289     if (ncomponents > 4) {
 290         avpriv_request_sample(s->avctx, "Support for %d components",
 291                               ncomponents);
 292         return AVERROR_PATCHWELCOME;
 293     }
 294
 295     s->ncomponents = ncomponents;
 296
 297     if (s->tile_width <= 0 || s->tile_height <= 0) {
 298         av_log(s->avctx, AV_LOG_ERROR, "Invalid tile dimension %dx%d.\n",
 299                s->tile_width, s->tile_height);
 300         return AVERROR_INVALIDDATA;
 301     }
 302
 303     if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents) {
 304         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for %d components in SIZ\n", s->ncomponents);
 305         return AVERROR_INVALIDDATA;
 306     }
 307
 308     for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i
 309         uint8_t x    = bytestream2_get_byteu(&s->g);
 310         s->cbps[i]   = (x & 0x7f) + 1;
 311         s->precision = FFMAX(s->cbps[i], s->precision);
 312         s->sgnd[i]   = !!(x & 0x80);
 313         s->cdx[i]    = bytestream2_get_byteu(&s->g);
 314         s->cdy[i]    = bytestream2_get_byteu(&s->g);
 315         if (   !s->cdx[i] || s->cdx[i] == 3 || s->cdx[i] > 4
 316             || !s->cdy[i] || s->cdy[i] == 3 || s->cdy[i] > 4) {
 317             av_log(s->avctx, AV_LOG_ERROR, "Invalid sample separation %d/%d\n", s->cdx[i], s->cdy[i]);
 318             return AVERROR_INVALIDDATA;
 319         }
 320         log2_chroma_wh |= s->cdy[i] >> 1 << i * 4 | s->cdx[i] >> 1 << i * 4 + 2;
 321     }
 322
 323     s->numXtiles = ff_jpeg2000_ceildiv(s->width  - s->tile_offset_x, s->tile_width);
 324     s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height);
 325
 326     if (s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(*s->tile)) {
 327         s->numXtiles = s->numYtiles = 0;
 328         return AVERROR(EINVAL);
 329     }
 330
 331     s->tile = av_mallocz_array(s->numXtiles * s->numYtiles, sizeof(*s->tile));
 332     if (!s->tile) {
 333         s->numXtiles = s->numYtiles = 0;
 334         return AVERROR(ENOMEM);
 335     }
 336
 337     for (i = 0; i < s->numXtiles * s->numYtiles; i++) {
 338         Jpeg2000Tile *tile = s->tile + i;
 339
 340         tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp));
 341         if (!tile->comp)
 342             return AVERROR(ENOMEM);
 343     }
 344
 345     /* compute image size with reduction factor */
 346     s->avctx->width  = ff_jpeg2000_ceildivpow2(s->width  - s->image_offset_x,
 347                                                s->reduction_factor);
 348     s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y,
 349                                                s->reduction_factor);
 350
 351     if (s->avctx->profile == FF_PROFILE_JPEG2000_DCINEMA_2K ||
 352         s->avctx->profile == FF_PROFILE_JPEG2000_DCINEMA_4K) {
 353         possible_fmts = xyz_pix_fmts;
 354         possible_fmts_nb = FF_ARRAY_ELEMS(xyz_pix_fmts);
 355     } else {
 356         switch (s->colour_space) {
 357         case 16:
 358             possible_fmts = rgb_pix_fmts;
 359             possible_fmts_nb = FF_ARRAY_ELEMS(rgb_pix_fmts);
 360             break;
 361         case 17:
 362             possible_fmts = gray_pix_fmts;
 363             possible_fmts_nb = FF_ARRAY_ELEMS(gray_pix_fmts);
 364             break;
 365         case 18:
 366             possible_fmts = yuv_pix_fmts;
 367             possible_fmts_nb = FF_ARRAY_ELEMS(yuv_pix_fmts);
 368             break;
 369         default:
 370             possible_fmts = all_pix_fmts;
 371             possible_fmts_nb = FF_ARRAY_ELEMS(all_pix_fmts);
 372             break;
 373         }
 374     }
 375     for (i = 0; i < possible_fmts_nb; ++i) {
 376         if (pix_fmt_match(possible_fmts[i], ncomponents, s->precision, log2_chroma_wh, s->pal8)) {
 377             s->avctx->pix_fmt = possible_fmts[i];
 378             break;
 379         }
 380     }
 381
 382     if (i == possible_fmts_nb) {
 383         if (ncomponents == 4 &&
 384             s->cdy[0] == 1 && s->cdx[0] == 1 &&
 385             s->cdy[1] == 1 && s->cdx[1] == 1 &&
 386             s->cdy[2] == s->cdy[3] && s->cdx[2] == s->cdx[3]) {
 387             if (s->precision == 8 && s->cdy[2] == 2 && s->cdx[2] == 2 && !s->pal8) {
 388                 s->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
 389                 s->cdef[0] = 0;
 390                 s->cdef[1] = 1;
 391                 s->cdef[2] = 2;
 392                 s->cdef[3] = 3;
 393                 i = 0;
 394             }
 395         }
 396     }
 397
 398
 399     if (i == possible_fmts_nb) {
 400         av_log(s->avctx, AV_LOG_ERROR,
 401                "Unknown pix_fmt, profile: %d, colour_space: %d, "
 402                "components: %d, precision: %d\n"
 403                "cdx[0]: %d, cdy[0]: %d\n"
 404                "cdx[1]: %d, cdy[1]: %d\n"
 405                "cdx[2]: %d, cdy[2]: %d\n"
 406                "cdx[3]: %d, cdy[3]: %d\n",
 407                s->avctx->profile, s->colour_space, ncomponents, s->precision,
 408                s->cdx[0],
 409                s->cdy[0],
 410                ncomponents > 1 ? s->cdx[1] : 0,
 411                ncomponents > 1 ? s->cdy[1] : 0,
 412                ncomponents > 2 ? s->cdx[2] : 0,
 413                ncomponents > 2 ? s->cdy[2] : 0,
 414                ncomponents > 3 ? s->cdx[3] : 0,
 415                ncomponents > 3 ? s->cdy[3] : 0);
 416         return AVERROR_PATCHWELCOME;
 417     }
 418     s->avctx->bits_per_raw_sample = s->precision;
 419     return 0;
 420 }
 421
 422 /* get common part for COD and COC segments */
 423 static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c)
 424 {
 425     uint8_t byte;
 426
 427     if (bytestream2_get_bytes_left(&s->g) < 5) {
 428         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for COX\n");
 429         return AVERROR_INVALIDDATA;
 430     }
 431
 432     /*  nreslevels = number of resolution levels
 433                    = number of decomposition level +1 */
 434     c->nreslevels = bytestream2_get_byteu(&s->g) + 1;
 435     if (c->nreslevels >= JPEG2000_MAX_RESLEVELS) {
 436         av_log(s->avctx, AV_LOG_ERROR, "nreslevels %d is invalid\n", c->nreslevels);
 437         return AVERROR_INVALIDDATA;
 438     }
 439
 440     if (c->nreslevels <= s->reduction_factor) {
 441         /* we are forced to update reduction_factor as its requested value is
 442            not compatible with this bitstream, and as we might have used it
 443            already in setup earlier we have to fail this frame until
 444            reinitialization is implemented */
 445         av_log(s->avctx, AV_LOG_ERROR, "reduction_factor too large for this bitstream, max is %d\n", c->nreslevels - 1);
 446         s->reduction_factor = c->nreslevels - 1;
 447         return AVERROR(EINVAL);
 448     }
 449
 450     /* compute number of resolution levels to decode */
 451     c->nreslevels2decode = c->nreslevels - s->reduction_factor;
 452
 453     c->log2_cblk_width  = (bytestream2_get_byteu(&s->g) & 15) + 2; // cblk width
 454     c->log2_cblk_height = (bytestream2_get_byteu(&s->g) & 15) + 2; // cblk height
 455
 456     if (c->log2_cblk_width > 10 || c->log2_cblk_height > 10 ||
 457         c->log2_cblk_width + c->log2_cblk_height > 12) {
 458         av_log(s->avctx, AV_LOG_ERROR, "cblk size invalid\n");
 459         return AVERROR_INVALIDDATA;
 460     }
 461
 462     c->cblk_style = bytestream2_get_byteu(&s->g);
 463     if (c->cblk_style != 0) { // cblk style
 464         av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
 465         if (c->cblk_style & JPEG2000_CBLK_BYPASS)
 466             av_log(s->avctx, AV_LOG_WARNING, "Selective arithmetic coding bypass\n");
 467     }
 468     c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type
 469     /* set integer 9/7 DWT in case of BITEXACT flag */
 470     if ((s->avctx->flags & AV_CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97))
 471         c->transform = FF_DWT97_INT;
 472     else if (c->transform == FF_DWT53) {
 473         s->avctx->properties |= FF_CODEC_PROPERTY_LOSSLESS;
 474     }
 475
 476     if (c->csty & JPEG2000_CSTY_PREC) {
 477         int i;
 478         for (i = 0; i < c->nreslevels; i++) {
 479             byte = bytestream2_get_byte(&s->g);
 480             c->log2_prec_widths[i]  =  byte       & 0x0F;    // precinct PPx
 481             c->log2_prec_heights[i] = (byte >> 4) & 0x0F;    // precinct PPy
 482             if (i)
 483                 if (c->log2_prec_widths[i] == 0 || c->log2_prec_heights[i] == 0) {
 484                     av_log(s->avctx, AV_LOG_ERROR, "PPx %d PPy %d invalid\n",
 485                            c->log2_prec_widths[i], c->log2_prec_heights[i]);
 486                     c->log2_prec_widths[i] = c->log2_prec_heights[i] = 1;
 487                     return AVERROR_INVALIDDATA;
 488                 }
 489         }
 490     } else {
 491         memset(c->log2_prec_widths , 15, sizeof(c->log2_prec_widths ));
 492         memset(c->log2_prec_heights, 15, sizeof(c->log2_prec_heights));
 493     }
 494     return 0;
 495 }
 496
 497 /* get coding parameters for a particular tile or whole image*/
 498 static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 499                    uint8_t *properties)
 500 {
 501     Jpeg2000CodingStyle tmp;
 502     int compno, ret;
 503
 504     if (bytestream2_get_bytes_left(&s->g) < 5) {
 505         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for COD\n");
 506         return AVERROR_INVALIDDATA;
 507     }
 508
 509     tmp.csty = bytestream2_get_byteu(&s->g);
 510
 511     // get progression order
 512     tmp.prog_order = bytestream2_get_byteu(&s->g);
 513
 514     tmp.nlayers    = bytestream2_get_be16u(&s->g);
 515     tmp.mct        = bytestream2_get_byteu(&s->g); // multiple component transformation
 516
 517     if (tmp.mct && s->ncomponents < 3) {
 518         av_log(s->avctx, AV_LOG_ERROR,
 519                "MCT %"PRIu8" with too few components (%d)\n",
 520                tmp.mct, s->ncomponents);
 521         return AVERROR_INVALIDDATA;
 522     }
 523
 524     if ((ret = get_cox(s, &tmp)) < 0)
 525         return ret;
 526
 527     for (compno = 0; compno < s->ncomponents; compno++)
 528         if (!(properties[compno] & HAD_COC))
 529             memcpy(c + compno, &tmp, sizeof(tmp));
 530     return 0;
 531 }
 532
 533 /* Get coding parameters for a component in the whole image or a
 534  * particular tile. */
 535 static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c,
 536                    uint8_t *properties)
 537 {
 538     int compno, ret;
 539
 540     if (bytestream2_get_bytes_left(&s->g) < 2) {
 541         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for COC\n");
 542         return AVERROR_INVALIDDATA;
 543     }
 544
 545     compno = bytestream2_get_byteu(&s->g);
 546
 547     if (compno >= s->ncomponents) {
 548         av_log(s->avctx, AV_LOG_ERROR,
 549                "Invalid compno %d. There are %d components in the image.\n",
 550                compno, s->ncomponents);
 551         return AVERROR_INVALIDDATA;
 552     }
 553
 554     c      += compno;
 555     c->csty = bytestream2_get_byteu(&s->g);
 556
 557     if ((ret = get_cox(s, c)) < 0)
 558         return ret;
 559
 560     properties[compno] |= HAD_COC;
 561     return 0;
 562 }
 563
 564 /* Get common part for QCD and QCC segments. */
 565 static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q)
 566 {
 567     int i, x;
 568
 569     if (bytestream2_get_bytes_left(&s->g) < 1)
 570         return AVERROR_INVALIDDATA;
 571
 572     x = bytestream2_get_byteu(&s->g); // Sqcd
 573
 574     q->nguardbits = x >> 5;
 575     q->quantsty   = x & 0x1f;
 576
 577     if (q->quantsty == JPEG2000_QSTY_NONE) {
 578         n -= 3;
 579         if (bytestream2_get_bytes_left(&s->g) < n ||
 580             n > JPEG2000_MAX_DECLEVELS*3)
 581             return AVERROR_INVALIDDATA;
 582         for (i = 0; i < n; i++)
 583             q->expn[i] = bytestream2_get_byteu(&s->g) >> 3;
 584     } else if (q->quantsty == JPEG2000_QSTY_SI) {
 585         if (bytestream2_get_bytes_left(&s->g) < 2)
 586             return AVERROR_INVALIDDATA;
 587         x          = bytestream2_get_be16u(&s->g);
 588         q->expn[0] = x >> 11;
 589         q->mant[0] = x & 0x7ff;
 590         for (i = 1; i < JPEG2000_MAX_DECLEVELS * 3; i++) {
 591             int curexpn = FFMAX(0, q->expn[0] - (i - 1) / 3);
 592             q->expn[i] = curexpn;
 593             q->mant[i] = q->mant[0];
 594         }
 595     } else {
 596         n = (n - 3) >> 1;
 597         if (bytestream2_get_bytes_left(&s->g) < 2 * n ||
 598             n > JPEG2000_MAX_DECLEVELS*3)
 599             return AVERROR_INVALIDDATA;
 600         for (i = 0; i < n; i++) {
 601             x          = bytestream2_get_be16u(&s->g);
 602             q->expn[i] = x >> 11;
 603             q->mant[i] = x & 0x7ff;
 604         }
 605     }
 606     return 0;
 607 }
 608
 609 /* Get quantization parameters for a particular tile or a whole image. */
 610 static int get_qcd(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 611                    uint8_t *properties)
 612 {
 613     Jpeg2000QuantStyle tmp;
 614     int compno, ret;
 615
 616     memset(&tmp, 0, sizeof(tmp));
 617
 618     if ((ret = get_qcx(s, n, &tmp)) < 0)
 619         return ret;
 620     for (compno = 0; compno < s->ncomponents; compno++)
 621         if (!(properties[compno] & HAD_QCC))
 622             memcpy(q + compno, &tmp, sizeof(tmp));
 623     return 0;
 624 }
 625
 626 /* Get quantization parameters for a component in the whole image
 627  * on in a particular tile. */
 628 static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q,
 629                    uint8_t *properties)
 630 {
 631     int compno;
 632
 633     if (bytestream2_get_bytes_left(&s->g) < 1)
 634         return AVERROR_INVALIDDATA;
 635
 636     compno = bytestream2_get_byteu(&s->g);
 637
 638     if (compno >= s->ncomponents) {
 639         av_log(s->avctx, AV_LOG_ERROR,
 640                "Invalid compno %d. There are %d components in the image.\n",
 641                compno, s->ncomponents);
 642         return AVERROR_INVALIDDATA;
 643     }
 644
 645     properties[compno] |= HAD_QCC;
 646     return get_qcx(s, n - 1, q + compno);
 647 }
 648
 649 static int get_poc(Jpeg2000DecoderContext *s, int size, Jpeg2000POC *p)
 650 {
 651     int i;
 652     int elem_size = s->ncomponents <= 257 ? 7 : 9;
 653     Jpeg2000POC tmp = {{{0}}};
 654
 655     if (bytestream2_get_bytes_left(&s->g) < 5 || size < 2 + elem_size) {
 656         av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for POC\n");
 657         return AVERROR_INVALIDDATA;
 658     }
 659
 660     if (elem_size > 7) {
 661         avpriv_request_sample(s->avctx, "Fat POC not supported");
 662         return AVERROR_PATCHWELCOME;
 663     }
 664
 665     tmp.nb_poc = (size - 2) / elem_size;
 666     if (tmp.nb_poc > MAX_POCS) {
 667         avpriv_request_sample(s->avctx, "Too many POCs (%d)", tmp.nb_poc);
 668         return AVERROR_PATCHWELCOME;
 669     }
 670
 671     for (i = 0; i<tmp.nb_poc; i++) {
 672         Jpeg2000POCEntry *e = &tmp.poc[i];
 673         e->RSpoc  = bytestream2_get_byteu(&s->g);
 674         e->CSpoc  = bytestream2_get_byteu(&s->g);
 675         e->LYEpoc = bytestream2_get_be16u(&s->g);
 676         e->REpoc  = bytestream2_get_byteu(&s->g);
 677         e->CEpoc  = bytestream2_get_byteu(&s->g);
 678         e->Ppoc   = bytestream2_get_byteu(&s->g);
 679         if (!e->CEpoc)
 680             e->CEpoc = 256;
 681         if (e->CEpoc > s->ncomponents)
 682             e->CEpoc = s->ncomponents;
 683         if (   e->RSpoc >= e->REpoc || e->REpoc > 33
 684             || e->CSpoc >= e->CEpoc || e->CEpoc > s->ncomponents
 685             || !e->LYEpoc) {
 686             av_log(s->avctx, AV_LOG_ERROR, "POC Entry %d is invalid (%d, %d, %d, %d, %d, %d)\n", i,
 687                 e->RSpoc, e->CSpoc, e->LYEpoc, e->REpoc, e->CEpoc, e->Ppoc
 688             );
 689             return AVERROR_INVALIDDATA;
 690         }
 691     }
 692
 693     if (!p->nb_poc || p->is_default) {
 694         *p = tmp;
 695     } else {
 696         if (p->nb_poc + tmp.nb_poc > MAX_POCS) {
 697             av_log(s->avctx, AV_LOG_ERROR, "Insufficient space for POC\n");
 698             return AVERROR_INVALIDDATA;
 699         }
 700         memcpy(p->poc + p->nb_poc, tmp.poc, tmp.nb_poc * sizeof(tmp.poc[0]));
 701         p->nb_poc += tmp.nb_poc;
 702     }
 703
 704     p->is_default = 0;
 705
 706     return 0;
 707 }
 708
 709
 710 /* Get start of tile segment. */
 711 static int get_sot(Jpeg2000DecoderContext *s, int n)
 712 {
 713     Jpeg2000TilePart *tp;
 714     uint16_t Isot;
 715     uint32_t Psot;
 716     unsigned TPsot;
 717
 718     if (bytestream2_get_bytes_left(&s->g) < 8)
 719         return AVERROR_INVALIDDATA;
 720
 721     s->curtileno = 0;
 722     Isot = bytestream2_get_be16u(&s->g);        // Isot
 723     if (Isot >= s->numXtiles * s->numYtiles)
 724         return AVERROR_INVALIDDATA;
 725
 726     s->curtileno = Isot;
 727     Psot  = bytestream2_get_be32u(&s->g);       // Psot
 728     TPsot = bytestream2_get_byteu(&s->g);       // TPsot
 729
 730     /* Read TNSot but not used */
 731     bytestream2_get_byteu(&s->g);               // TNsot
 732
 733     if (!Psot)
 734         Psot = bytestream2_get_bytes_left(&s->g) + n + 2;
 735
 736     if (Psot > bytestream2_get_bytes_left(&s->g) + n + 2) {
 737         av_log(s->avctx, AV_LOG_ERROR, "Psot %"PRIu32" too big\n", Psot);
 738         return AVERROR_INVALIDDATA;
 739     }
 740
 741     av_assert0(TPsot < FF_ARRAY_ELEMS(s->tile[Isot].tile_part));
 742
 743     s->tile[Isot].tp_idx = TPsot;
 744     tp             = s->tile[Isot].tile_part + TPsot;
 745     tp->tile_index = Isot;
 746     tp->tp_end     = s->g.buffer + Psot - n - 2;
 747
 748     if (!TPsot) {
 749         Jpeg2000Tile *tile = s->tile + s->curtileno;
 750
 751         /* copy defaults */
 752         memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(Jpeg2000CodingStyle));
 753         memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(Jpeg2000QuantStyle));
 754         memcpy(&tile->poc  , &s->poc  , sizeof(tile->poc));
 755         tile->poc.is_default = 1;
 756     }
 757
 758     return 0;
 759 }
 760
 761 /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1
 762  * Used to know the number of tile parts and lengths.
 763  * There may be multiple TLMs in the header.
 764  * TODO: The function is not used for tile-parts management, nor anywhere else.
 765  * It can be useful to allocate memory for tile parts, before managing the SOT
 766  * markers. Parsing the TLM header is needed to increment the input header
 767  * buffer.
 768  * This marker is mandatory for DCI. */
 769 static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n)
 770 {
 771     uint8_t Stlm, ST, SP, tile_tlm, i;
 772     bytestream2_get_byte(&s->g);               /* Ztlm: skipped */
 773     Stlm = bytestream2_get_byte(&s->g);
 774
 775     // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02);
 776     ST = (Stlm >> 4) & 0x03;
 777     // TODO: Manage case of ST = 0b11 --> raise error
 778     SP       = (Stlm >> 6) & 0x01;
 779     tile_tlm = (n - 4) / ((SP + 1) * 2 + ST);
 780     for (i = 0; i < tile_tlm; i++) {
 781         switch (ST) {
 782         case 0:
 783             break;
 784         case 1:
 785             bytestream2_get_byte(&s->g);
 786             break;
 787         case 2:
 788             bytestream2_get_be16(&s->g);
 789             break;
 790         case 3:
 791             bytestream2_get_be32(&s->g);
 792             break;
 793         }
 794         if (SP == 0) {
 795             bytestream2_get_be16(&s->g);
 796         } else {
 797             bytestream2_get_be32(&s->g);
 798         }
 799     }
 800     return 0;
 801 }
 802
 803 static uint8_t get_plt(Jpeg2000DecoderContext *s, int n)
 804 {
 805     int i;
 806
 807     av_log(s->avctx, AV_LOG_DEBUG,
 808             "PLT marker at pos 0x%X\n", bytestream2_tell(&s->g) - 4);
 809
 810     /*Zplt =*/ bytestream2_get_byte(&s->g);
 811
 812     for (i = 0; i < n - 3; i++) {
 813         bytestream2_get_byte(&s->g);
 814     }
 815
 816     return 0;
 817 }
 818
 819 static int init_tile(Jpeg2000DecoderContext *s, int tileno)
 820 {
 821     int compno;
 822     int tilex = tileno % s->numXtiles;
 823     int tiley = tileno / s->numXtiles;
 824     Jpeg2000Tile *tile = s->tile + tileno;
 825
 826     if (!tile->comp)
 827         return AVERROR(ENOMEM);
 828
 829     tile->coord[0][0] = av_clip(tilex       * s->tile_width  + s->tile_offset_x, s->image_offset_x, s->width);
 830     tile->coord[0][1] = av_clip((tilex + 1) * s->tile_width  + s->tile_offset_x, s->image_offset_x, s->width);
 831     tile->coord[1][0] = av_clip(tiley       * s->tile_height + s->tile_offset_y, s->image_offset_y, s->height);
 832     tile->coord[1][1] = av_clip((tiley + 1) * s->tile_height + s->tile_offset_y, s->image_offset_y, s->height);
 833
 834     for (compno = 0; compno < s->ncomponents; compno++) {
 835         Jpeg2000Component *comp = tile->comp + compno;
 836         Jpeg2000CodingStyle *codsty = tile->codsty + compno;
 837         Jpeg2000QuantStyle  *qntsty = tile->qntsty + compno;
 838         int ret; // global bandno
 839
 840         comp->coord_o[0][0] = tile->coord[0][0];
 841         comp->coord_o[0][1] = tile->coord[0][1];
 842         comp->coord_o[1][0] = tile->coord[1][0];
 843         comp->coord_o[1][1] = tile->coord[1][1];
 844         if (compno) {
 845             comp->coord_o[0][0] /= s->cdx[compno];
 846             comp->coord_o[0][1] /= s->cdx[compno];
 847             comp->coord_o[1][0] /= s->cdy[compno];
 848             comp->coord_o[1][1] /= s->cdy[compno];
 849         }
 850
 851         comp->coord[0][0] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], s->reduction_factor);
 852         comp->coord[0][1] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][1], s->reduction_factor);
 853         comp->coord[1][0] = ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], s->reduction_factor);
 854         comp->coord[1][1] = ff_jpeg2000_ceildivpow2(comp->coord_o[1][1], s->reduction_factor);
 855
 856         if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty,
 857                                              s->cbps[compno], s->cdx[compno],
 858                                              s->cdy[compno], s->avctx))
 859             return ret;
 860     }
 861     return 0;
 862 }
 863
 864 /* Read the number of coding passes. */
 865 static int getnpasses(Jpeg2000DecoderContext *s)
 866 {
 867     int num;
 868     if (!get_bits(s, 1))
 869         return 1;
 870     if (!get_bits(s, 1))
 871         return 2;
 872     if ((num = get_bits(s, 2)) != 3)
 873         return num < 0 ? num : 3 + num;
 874     if ((num = get_bits(s, 5)) != 31)
 875         return num < 0 ? num : 6 + num;
 876     num = get_bits(s, 7);
 877     return num < 0 ? num : 37 + num;
 878 }
 879
 880 static int getlblockinc(Jpeg2000DecoderContext *s)
 881 {
 882     int res = 0, ret;
 883     while (ret = get_bits(s, 1)) {
 884         if (ret < 0)
 885             return ret;
 886         res++;
 887     }
 888     return res;
 889 }
 890
 891 static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile, int *tp_index,
 892                                   Jpeg2000CodingStyle *codsty,
 893                                   Jpeg2000ResLevel *rlevel, int precno,
 894                                   int layno, uint8_t *expn, int numgbits)
 895 {
 896     int bandno, cblkno, ret, nb_code_blocks;
 897     int cwsno;
 898
 899     if (layno < rlevel->band[0].prec[precno].decoded_layers)
 900         return 0;
 901     rlevel->band[0].prec[precno].decoded_layers = layno + 1;
 902
 903     if (bytestream2_get_bytes_left(&s->g) == 0 && s->bit_index == 8) {
 904         if (*tp_index < FF_ARRAY_ELEMS(tile->tile_part) - 1) {
 905             s->g = tile->tile_part[++(*tp_index)].tpg;
 906         }
 907     }
 908
 909     if (bytestream2_peek_be32(&s->g) == JPEG2000_SOP_FIXED_BYTES)
 910         bytestream2_skip(&s->g, JPEG2000_SOP_BYTE_LENGTH);
 911
 912     if (!(ret = get_bits(s, 1))) {
 913         jpeg2000_flush(s);
 914         return 0;
 915     } else if (ret < 0)
 916         return ret;
 917
 918     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
 919         Jpeg2000Band *band = rlevel->band + bandno;
 920         Jpeg2000Prec *prec = band->prec + precno;
 921
 922         if (band->coord[0][0] == band->coord[0][1] ||
 923             band->coord[1][0] == band->coord[1][1])
 924             continue;
 925         nb_code_blocks =  prec->nb_codeblocks_height *
 926                           prec->nb_codeblocks_width;
 927         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
 928             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
 929             int incl, newpasses, llen;
 930
 931             if (cblk->npasses)
 932                 incl = get_bits(s, 1);
 933             else
 934                 incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno;
 935             if (!incl)
 936                 continue;
 937             else if (incl < 0)
 938                 return incl;
 939
 940             if (!cblk->npasses) {
 941                 int v = expn[bandno] + numgbits - 1 -
 942                         tag_tree_decode(s, prec->zerobits + cblkno, 100);
 943                 if (v < 0) {
 944                     av_log(s->avctx, AV_LOG_ERROR,
 945                            "nonzerobits %d invalid\n", v);
 946                     return AVERROR_INVALIDDATA;
 947                 }
 948                 cblk->nonzerobits = v;
 949             }
 950             if ((newpasses = getnpasses(s)) < 0)
 951                 return newpasses;
 952             av_assert2(newpasses > 0);
 953             if (cblk->npasses + newpasses >= JPEG2000_MAX_PASSES) {
 954                 avpriv_request_sample(s->avctx, "Too many passes");
 955                 return AVERROR_PATCHWELCOME;
 956             }
 957             if ((llen = getlblockinc(s)) < 0)
 958                 return llen;
 959             if (cblk->lblock + llen + av_log2(newpasses) > 16) {
 960                 avpriv_request_sample(s->avctx,
 961                                       "Block with length beyond 16 bits");
 962                 return AVERROR_PATCHWELCOME;
 963             }
 964
 965             cblk->lblock += llen;
 966
 967             cblk->nb_lengthinc = 0;
 968             cblk->nb_terminationsinc = 0;
 969             do {
 970                 int newpasses1 = 0;
 971
 972                 while (newpasses1 < newpasses) {
 973                     newpasses1 ++;
 974                     if (needs_termination(codsty->cblk_style, cblk->npasses + newpasses1 - 1)) {
 975                         cblk->nb_terminationsinc ++;
 976                         break;
 977                     }
 978                 }
 979
 980                 if ((ret = get_bits(s, av_log2(newpasses1) + cblk->lblock)) < 0)
 981                     return ret;
 982                 if (ret > sizeof(cblk->data)) {
 983                     avpriv_request_sample(s->avctx,
 984                                         "Block with lengthinc greater than %"SIZE_SPECIFIER"",
 985                                         sizeof(cblk->data));
 986                     return AVERROR_PATCHWELCOME;
 987                 }
 988                 cblk->lengthinc[cblk->nb_lengthinc++] = ret;
 989                 cblk->npasses  += newpasses1;
 990                 newpasses -= newpasses1;
 991             } while(newpasses);
 992         }
 993     }
 994     jpeg2000_flush(s);
 995
 996     if (codsty->csty & JPEG2000_CSTY_EPH) {
 997         if (bytestream2_peek_be16(&s->g) == JPEG2000_EPH)
 998             bytestream2_skip(&s->g, 2);
 999         else
1000             av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found. instead %X\n", bytestream2_peek_be32(&s->g));
1001     }
1002
1003     for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1004         Jpeg2000Band *band = rlevel->band + bandno;
1005         Jpeg2000Prec *prec = band->prec + precno;
1006
1007         nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width;
1008         for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) {
1009             Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1010             for (cwsno = 0; cwsno < cblk->nb_lengthinc; cwsno ++) {
1011                 if (   bytestream2_get_bytes_left(&s->g) < cblk->lengthinc[cwsno]
1012                     || sizeof(cblk->data) < cblk->length + cblk->lengthinc[cwsno] + 4
1013                 ) {
1014                     av_log(s->avctx, AV_LOG_ERROR,
1015                         "Block length %"PRIu16" or lengthinc %d is too large, left %d\n",
1016                         cblk->length, cblk->lengthinc[cwsno], bytestream2_get_bytes_left(&s->g));
1017                     return AVERROR_INVALIDDATA;
1018                 }
1019
1020                 bytestream2_get_bufferu(&s->g, cblk->data + cblk->length, cblk->lengthinc[cwsno]);
1021                 cblk->length   += cblk->lengthinc[cwsno];
1022                 cblk->lengthinc[cwsno] = 0;
1023                 if (cblk->nb_terminationsinc) {
1024                     cblk->nb_terminationsinc--;
1025                     cblk->nb_terminations++;
1026                     cblk->data[cblk->length++] = 0xFF;
1027                     cblk->data[cblk->length++] = 0xFF;
1028                     cblk->data_start[cblk->nb_terminations] = cblk->length;
1029                 }
1030             }
1031         }
1032     }
1033     return 0;
1034 }
1035
1036 static int jpeg2000_decode_packets_po_iteration(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
1037                                              int RSpoc, int CSpoc,
1038                                              int LYEpoc, int REpoc, int CEpoc,
1039                                              int Ppoc, int *tp_index)
1040 {
1041     int ret = 0;
1042     int layno, reslevelno, compno, precno, ok_reslevel;
1043     int x, y;
1044     int step_x, step_y;
1045
1046     switch (Ppoc) {
1047     case JPEG2000_PGOD_RLCP:
1048         av_log(s->avctx, AV_LOG_DEBUG, "Progression order RLCP\n");
1049         ok_reslevel = 1;
1050         for (reslevelno = RSpoc; ok_reslevel && reslevelno < REpoc; reslevelno++) {
1051             ok_reslevel = 0;
1052             for (layno = 0; layno < LYEpoc; layno++) {
1053                 for (compno = CSpoc; compno < CEpoc; compno++) {
1054                     Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1055                     Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
1056                     if (reslevelno < codsty->nreslevels) {
1057                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
1058                                                 reslevelno;
1059                         ok_reslevel = 1;
1060                         for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
1061                             if ((ret = jpeg2000_decode_packet(s, tile, tp_index,
1062                                                               codsty, rlevel,
1063                                                               precno, layno,
1064                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
1065                                                               qntsty->nguardbits)) < 0)
1066                                 return ret;
1067                     }
1068                 }
1069             }
1070         }
1071         break;
1072
1073     case JPEG2000_PGOD_LRCP:
1074         av_log(s->avctx, AV_LOG_DEBUG, "Progression order LRCP\n");
1075         for (layno = 0; layno < LYEpoc; layno++) {
1076             ok_reslevel = 1;
1077             for (reslevelno = RSpoc; ok_reslevel && reslevelno < REpoc; reslevelno++) {
1078                 ok_reslevel = 0;
1079                 for (compno = CSpoc; compno < CEpoc; compno++) {
1080                     Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1081                     Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
1082                     if (reslevelno < codsty->nreslevels) {
1083                         Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel +
1084                                                 reslevelno;
1085                         ok_reslevel = 1;
1086                         for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++)
1087                             if ((ret = jpeg2000_decode_packet(s, tile, tp_index,
1088                                                               codsty, rlevel,
1089                                                               precno, layno,
1090                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
1091                                                               qntsty->nguardbits)) < 0)
1092                                 return ret;
1093                     }
1094                 }
1095             }
1096         }
1097         break;
1098
1099     case JPEG2000_PGOD_CPRL:
1100         av_log(s->avctx, AV_LOG_DEBUG, "Progression order CPRL\n");
1101         for (compno = CSpoc; compno < CEpoc; compno++) {
1102             Jpeg2000Component *comp     = tile->comp + compno;
1103             Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1104             Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
1105             step_x = 32;
1106             step_y = 32;
1107
1108             for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {
1109                 uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1110                 Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1111                 step_x = FFMIN(step_x, rlevel->log2_prec_width  + reducedresno);
1112                 step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
1113             }
1114             av_assert0(step_x < 32 && step_y < 32);
1115             step_x = 1<<step_x;
1116             step_y = 1<<step_y;
1117
1118             for (y = tile->coord[1][0]; y < tile->coord[1][1]; y = (y/step_y + 1)*step_y) {
1119                 for (x = tile->coord[0][0]; x < tile->coord[0][1]; x = (x/step_x + 1)*step_x) {
1120                     for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {
1121                         unsigned prcx, prcy;
1122                         uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1123                         Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1124                         int xc = x / s->cdx[compno];
1125                         int yc = y / s->cdy[compno];
1126
1127                         if (yc % (1 << (rlevel->log2_prec_height + reducedresno)) && y != tile->coord[1][0]) //FIXME this is a subset of the check
1128                             continue;
1129
1130                         if (xc % (1 << (rlevel->log2_prec_width + reducedresno)) && x != tile->coord[0][0]) //FIXME this is a subset of the check
1131                             continue;
1132
1133                         // check if a precinct exists
1134                         prcx   = ff_jpeg2000_ceildivpow2(xc, reducedresno) >> rlevel->log2_prec_width;
1135                         prcy   = ff_jpeg2000_ceildivpow2(yc, reducedresno) >> rlevel->log2_prec_height;
1136                         prcx  -= ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], reducedresno) >> rlevel->log2_prec_width;
1137                         prcy  -= ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], reducedresno) >> rlevel->log2_prec_height;
1138
1139                         precno = prcx + rlevel->num_precincts_x * prcy;
1140
1141                         if (prcx >= rlevel->num_precincts_x || prcy >= rlevel->num_precincts_y) {
1142                             av_log(s->avctx, AV_LOG_WARNING, "prc %d %d outside limits %d %d\n",
1143                                    prcx, prcy, rlevel->num_precincts_x, rlevel->num_precincts_y);
1144                             continue;
1145                         }
1146
1147                         for (layno = 0; layno < LYEpoc; layno++) {
1148                             if ((ret = jpeg2000_decode_packet(s, tile, tp_index, codsty, rlevel,
1149                                                               precno, layno,
1150                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
1151                                                               qntsty->nguardbits)) < 0)
1152                                 return ret;
1153                         }
1154                     }
1155                 }
1156             }
1157         }
1158         break;
1159
1160     case JPEG2000_PGOD_RPCL:
1161         av_log(s->avctx, AV_LOG_WARNING, "Progression order RPCL\n");
1162         ok_reslevel = 1;
1163         for (reslevelno = RSpoc; ok_reslevel && reslevelno < REpoc; reslevelno++) {
1164             ok_reslevel = 0;
1165             step_x = 30;
1166             step_y = 30;
1167             for (compno = CSpoc; compno < CEpoc; compno++) {
1168                 Jpeg2000Component *comp     = tile->comp + compno;
1169                 Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1170
1171                 if (reslevelno < codsty->nreslevels) {
1172                     uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1173                     Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1174                     step_x = FFMIN(step_x, rlevel->log2_prec_width  + reducedresno);
1175                     step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
1176                 }
1177             }
1178             step_x = 1<<step_x;
1179             step_y = 1<<step_y;
1180
1181             for (y = tile->coord[1][0]; y < tile->coord[1][1]; y = (y/step_y + 1)*step_y) {
1182                 for (x = tile->coord[0][0]; x < tile->coord[0][1]; x = (x/step_x + 1)*step_x) {
1183                     for (compno = CSpoc; compno < CEpoc; compno++) {
1184                         Jpeg2000Component *comp     = tile->comp + compno;
1185                         Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1186                         Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
1187                         uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1188                         Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1189                         unsigned prcx, prcy;
1190
1191                         int xc = x / s->cdx[compno];
1192                         int yc = y / s->cdy[compno];
1193
1194                         if (reslevelno >= codsty->nreslevels)
1195                             continue;
1196
1197                         if (yc % (1 << (rlevel->log2_prec_height + reducedresno)) && y != tile->coord[1][0]) //FIXME this is a subset of the check
1198                             continue;
1199
1200                         if (xc % (1 << (rlevel->log2_prec_width + reducedresno)) && x != tile->coord[0][0]) //FIXME this is a subset of the check
1201                             continue;
1202
1203                         // check if a precinct exists
1204                         prcx   = ff_jpeg2000_ceildivpow2(xc, reducedresno) >> rlevel->log2_prec_width;
1205                         prcy   = ff_jpeg2000_ceildivpow2(yc, reducedresno) >> rlevel->log2_prec_height;
1206                         prcx  -= ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], reducedresno) >> rlevel->log2_prec_width;
1207                         prcy  -= ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], reducedresno) >> rlevel->log2_prec_height;
1208
1209                         precno = prcx + rlevel->num_precincts_x * prcy;
1210
1211                         ok_reslevel = 1;
1212                         if (prcx >= rlevel->num_precincts_x || prcy >= rlevel->num_precincts_y) {
1213                             av_log(s->avctx, AV_LOG_WARNING, "prc %d %d outside limits %d %d\n",
1214                                    prcx, prcy, rlevel->num_precincts_x, rlevel->num_precincts_y);
1215                             continue;
1216                         }
1217
1218                             for (layno = 0; layno < LYEpoc; layno++) {
1219                                 if ((ret = jpeg2000_decode_packet(s, tile, tp_index,
1220                                                                 codsty, rlevel,
1221                                                                 precno, layno,
1222                                                                 qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
1223                                                                 qntsty->nguardbits)) < 0)
1224                                     return ret;
1225                             }
1226                     }
1227                 }
1228             }
1229         }
1230         break;
1231
1232     case JPEG2000_PGOD_PCRL:
1233         av_log(s->avctx, AV_LOG_WARNING, "Progression order PCRL\n");
1234         step_x = 32;
1235         step_y = 32;
1236         for (compno = CSpoc; compno < CEpoc; compno++) {
1237             Jpeg2000Component *comp     = tile->comp + compno;
1238             Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1239
1240             for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {
1241                 uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1242                 Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1243                 step_x = FFMIN(step_x, rlevel->log2_prec_width  + reducedresno);
1244                 step_y = FFMIN(step_y, rlevel->log2_prec_height + reducedresno);
1245             }
1246         }
1247         if (step_x >= 31 || step_y >= 31){
1248             avpriv_request_sample(s->avctx, "PCRL with large step");
1249             return AVERROR_PATCHWELCOME;
1250         }
1251         step_x = 1<<step_x;
1252         step_y = 1<<step_y;
1253
1254         for (y = tile->coord[1][0]; y < tile->coord[1][1]; y = (y/step_y + 1)*step_y) {
1255             for (x = tile->coord[0][0]; x < tile->coord[0][1]; x = (x/step_x + 1)*step_x) {
1256                 for (compno = CSpoc; compno < CEpoc; compno++) {
1257                     Jpeg2000Component *comp     = tile->comp + compno;
1258                     Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1259                     Jpeg2000QuantStyle *qntsty  = tile->qntsty + compno;
1260                     int xc = x / s->cdx[compno];
1261                     int yc = y / s->cdy[compno];
1262
1263                     for (reslevelno = RSpoc; reslevelno < FFMIN(codsty->nreslevels, REpoc); reslevelno++) {
1264                         unsigned prcx, prcy;
1265                         uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; //  ==> N_L - r
1266                         Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1267
1268                         if (yc % (1 << (rlevel->log2_prec_height + reducedresno)) && y != tile->coord[1][0]) //FIXME this is a subset of the check
1269                             continue;
1270
1271                         if (xc % (1 << (rlevel->log2_prec_width + reducedresno)) && x != tile->coord[0][0]) //FIXME this is a subset of the check
1272                             continue;
1273
1274                         // check if a precinct exists
1275                         prcx   = ff_jpeg2000_ceildivpow2(xc, reducedresno) >> rlevel->log2_prec_width;
1276                         prcy   = ff_jpeg2000_ceildivpow2(yc, reducedresno) >> rlevel->log2_prec_height;
1277                         prcx  -= ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], reducedresno) >> rlevel->log2_prec_width;
1278                         prcy  -= ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], reducedresno) >> rlevel->log2_prec_height;
1279
1280                         precno = prcx + rlevel->num_precincts_x * prcy;
1281
1282                         if (prcx >= rlevel->num_precincts_x || prcy >= rlevel->num_precincts_y) {
1283                             av_log(s->avctx, AV_LOG_WARNING, "prc %d %d outside limits %d %d\n",
1284                                    prcx, prcy, rlevel->num_precincts_x, rlevel->num_precincts_y);
1285                             continue;
1286                         }
1287
1288                         for (layno = 0; layno < LYEpoc; layno++) {
1289                             if ((ret = jpeg2000_decode_packet(s, tile, tp_index, codsty, rlevel,
1290                                                               precno, layno,
1291                                                               qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0),
1292                                                               qntsty->nguardbits)) < 0)
1293                                 return ret;
1294                         }
1295                     }
1296                 }
1297             }
1298         }
1299         break;
1300
1301     default:
1302         break;
1303     }
1304
1305     return ret;
1306 }
1307
1308 static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
1309 {
1310     int ret = AVERROR_BUG;
1311     int i;
1312     int tp_index = 0;
1313
1314     s->bit_index = 8;
1315     if (tile->poc.nb_poc) {
1316         for (i=0; i<tile->poc.nb_poc; i++) {
1317             Jpeg2000POCEntry *e = &tile->poc.poc[i];
1318             ret = jpeg2000_decode_packets_po_iteration(s, tile,
1319                 e->RSpoc, e->CSpoc,
1320                 FFMIN(e->LYEpoc, tile->codsty[0].nlayers),
1321                 e->REpoc,
1322                 FFMIN(e->CEpoc, s->ncomponents),
1323                 e->Ppoc, &tp_index
1324                 );
1325             if (ret < 0)
1326                 return ret;
1327         }
1328     } else {
1329         ret = jpeg2000_decode_packets_po_iteration(s, tile,
1330             0, 0,
1331             tile->codsty[0].nlayers,
1332             33,
1333             s->ncomponents,
1334             tile->codsty[0].prog_order,
1335             &tp_index
1336         );
1337     }
1338     /* EOC marker reached */
1339     bytestream2_skip(&s->g, 2);
1340
1341     return ret;
1342 }
1343
1344 /* TIER-1 routines */
1345 static void decode_sigpass(Jpeg2000T1Context *t1, int width, int height,
1346                            int bpno, int bandno,
1347                            int vert_causal_ctx_csty_symbol)
1348 {
1349     int mask = 3 << (bpno - 1), y0, x, y;
1350
1351     for (y0 = 0; y0 < height; y0 += 4)
1352         for (x = 0; x < width; x++)
1353             for (y = y0; y < height && y < y0 + 4; y++) {
1354                 int flags_mask = -1;
1355                 if (vert_causal_ctx_csty_symbol && y == y0 + 3)
1356                     flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S);
1357                 if ((t1->flags[(y+1) * t1->stride + x+1] & JPEG2000_T1_SIG_NB & flags_mask)
1358                 && !(t1->flags[(y+1) * t1->stride + x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
1359                     if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[(y+1) * t1->stride + x+1] & flags_mask, bandno))) {
1360                         int xorbit, ctxno = ff_jpeg2000_getsgnctxno(t1->flags[(y+1) * t1->stride + x+1] & flags_mask, &xorbit);
1361                         if (t1->mqc.raw)
1362                              t1->data[(y) * t1->stride + x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
1363                         else
1364                              t1->data[(y) * t1->stride + x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?
1365                                                -mask : mask;
1366
1367                         ff_jpeg2000_set_significance(t1, x, y,
1368                                                      t1->data[(y) * t1->stride + x] < 0);
1369                     }
1370                     t1->flags[(y + 1) * t1->stride + x + 1] |= JPEG2000_T1_VIS;
1371                 }
1372             }
1373 }
1374
1375 static void decode_refpass(Jpeg2000T1Context *t1, int width, int height,
1376                            int bpno, int vert_causal_ctx_csty_symbol)
1377 {
1378     int phalf, nhalf;
1379     int y0, x, y;
1380
1381     phalf = 1 << (bpno - 1);
1382     nhalf = -phalf;
1383
1384     for (y0 = 0; y0 < height; y0 += 4)
1385         for (x = 0; x < width; x++)
1386             for (y = y0; y < height && y < y0 + 4; y++)
1387                 if ((t1->flags[(y + 1) * t1->stride + x + 1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) {
1388                     int flags_mask = (vert_causal_ctx_csty_symbol && y == y0 + 3) ?
1389                         ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S) : -1;
1390                     int ctxno = ff_jpeg2000_getrefctxno(t1->flags[(y + 1) * t1->stride + x + 1] & flags_mask);
1391                     int r     = ff_mqc_decode(&t1->mqc,
1392                                               t1->mqc.cx_states + ctxno)
1393                                 ? phalf : nhalf;
1394                     t1->data[(y) * t1->stride + x]          += t1->data[(y) * t1->stride + x] < 0 ? -r : r;
1395                     t1->flags[(y + 1) * t1->stride + x + 1] |= JPEG2000_T1_REF;
1396                 }
1397 }
1398
1399 static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1,
1400                            int width, int height, int bpno, int bandno,
1401                            int seg_symbols, int vert_causal_ctx_csty_symbol)
1402 {
1403     int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
1404
1405     for (y0 = 0; y0 < height; y0 += 4) {
1406         for (x = 0; x < width; x++) {
1407             int flags_mask = -1;
1408             if (vert_causal_ctx_csty_symbol)
1409                 flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S);
1410             if (y0 + 3 < height &&
1411                 !((t1->flags[(y0 + 1) * t1->stride + x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
1412                   (t1->flags[(y0 + 2) * t1->stride + x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
1413                   (t1->flags[(y0 + 3) * t1->stride + x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) ||
1414                   (t1->flags[(y0 + 4) * t1->stride + x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG) & flags_mask))) {
1415                 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
1416                     continue;
1417                 runlen = ff_mqc_decode(&t1->mqc,
1418                                        t1->mqc.cx_states + MQC_CX_UNI);
1419                 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc,
1420                                                        t1->mqc.cx_states +
1421                                                        MQC_CX_UNI);
1422                 dec = 1;
1423             } else {
1424                 runlen = 0;
1425                 dec    = 0;
1426             }
1427
1428             for (y = y0 + runlen; y < y0 + 4 && y < height; y++) {
1429                 int flags_mask = -1;
1430                 if (vert_causal_ctx_csty_symbol && y == y0 + 3)
1431                     flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE | JPEG2000_T1_SGN_S);
1432                 if (!dec) {
1433                     if (!(t1->flags[(y+1) * t1->stride + x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) {
1434                         dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[(y+1) * t1->stride + x+1] & flags_mask,
1435                                                                                              bandno));
1436                     }
1437                 }
1438                 if (dec) {
1439                     int xorbit;
1440                     int ctxno = ff_jpeg2000_getsgnctxno(t1->flags[(y + 1) * t1->stride + x + 1] & flags_mask,
1441                                                         &xorbit);
1442                     t1->data[(y) * t1->stride + x] = (ff_mqc_decode(&t1->mqc,
1443                                                     t1->mqc.cx_states + ctxno) ^
1444                                       xorbit)
1445                                      ? -mask : mask;
1446                     ff_jpeg2000_set_significance(t1, x, y, t1->data[(y) * t1->stride + x] < 0);
1447                 }
1448                 dec = 0;
1449                 t1->flags[(y + 1) * t1->stride + x + 1] &= ~JPEG2000_T1_VIS;
1450             }
1451         }
1452     }
1453     if (seg_symbols) {
1454         int val;
1455         val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
1456         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
1457         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
1458         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
1459         if (val != 0xa)
1460             av_log(s->avctx, AV_LOG_ERROR,
1461                    "Segmentation symbol value incorrect\n");
1462     }
1463 }
1464
1465 static int decode_cblk(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty,
1466                        Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk,
1467                        int width, int height, int bandpos)
1468 {
1469     int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1;
1470     int pass_cnt = 0;
1471     int vert_causal_ctx_csty_symbol = codsty->cblk_style & JPEG2000_CBLK_VSC;
1472     int term_cnt = 0;
1473     int coder_type;
1474
1475     av_assert0(width <= 1024U && height <= 1024U);
1476     av_assert0(width*height <= 4096);
1477
1478     memset(t1->data, 0, t1->stride * height * sizeof(*t1->data));
1479
1480     /* If code-block contains no compressed data: nothing to do. */
1481     if (!cblk->length)
1482         return 0;
1483
1484     memset(t1->flags, 0, t1->stride * (height + 2) * sizeof(*t1->flags));
1485
1486     cblk->data[cblk->length] = 0xff;
1487     cblk->data[cblk->length+1] = 0xff;
1488     ff_mqc_initdec(&t1->mqc, cblk->data, 0, 1);
1489
1490     while (passno--) {
1491         switch(pass_t) {
1492         case 0:
1493             decode_sigpass(t1, width, height, bpno + 1, bandpos,
1494                            vert_causal_ctx_csty_symbol);
1495             break;
1496         case 1:
1497             decode_refpass(t1, width, height, bpno + 1, vert_causal_ctx_csty_symbol);
1498             break;
1499         case 2:
1500             av_assert2(!t1->mqc.raw);
1501             decode_clnpass(s, t1, width, height, bpno + 1, bandpos,
1502                            codsty->cblk_style & JPEG2000_CBLK_SEGSYM,
1503                            vert_causal_ctx_csty_symbol);
1504             break;
1505         }
1506         if (codsty->cblk_style & JPEG2000_CBLK_RESET) // XXX no testcase for just this
1507             ff_mqc_init_contexts(&t1->mqc);
1508
1509         if (passno && (coder_type = needs_termination(codsty->cblk_style, pass_cnt))) {
1510             if (term_cnt >= cblk->nb_terminations) {
1511                 av_log(s->avctx, AV_LOG_ERROR, "Missing needed termination \n");
1512                 return AVERROR_INVALIDDATA;
1513             }
1514             if (FFABS(cblk->data + cblk->data_start[term_cnt + 1] - 2 - t1->mqc.bp) > 0) {
1515                 av_log(s->avctx, AV_LOG_WARNING, "Mid mismatch %"PTRDIFF_SPECIFIER" in pass %d of %d\n",
1516                     cblk->data + cblk->data_start[term_cnt + 1] - 2 - t1->mqc.bp,
1517                     pass_cnt, cblk->npasses);
1518             }
1519
1520             ff_mqc_initdec(&t1->mqc, cblk->data + cblk->data_start[++term_cnt], coder_type == 2, 0);
1521         }
1522
1523         pass_t++;
1524         if (pass_t == 3) {
1525             bpno--;
1526             pass_t = 0;
1527         }
1528         pass_cnt ++;
1529     }
1530
1531     if (cblk->data + cblk->length - 2*(term_cnt < cblk->nb_terminations) != t1->mqc.bp) {
1532         av_log(s->avctx, AV_LOG_WARNING, "End mismatch %"PTRDIFF_SPECIFIER"\n",
1533                cblk->data + cblk->length - 2*(term_cnt < cblk->nb_terminations) - t1->mqc.bp);
1534     }
1535
1536     return 0;
1537 }
1538
1539 /* TODO: Verify dequantization for lossless case
1540  * comp->data can be float or int
1541  * band->stepsize can be float or int
1542  * depending on the type of DWT transformation.
1543  * see ISO/IEC 15444-1:2002 A.6.1 */
1544
1545 /* Float dequantization of a codeblock.*/
1546 static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk,
1547                                  Jpeg2000Component *comp,
1548                                  Jpeg2000T1Context *t1, Jpeg2000Band *band)
1549 {
1550     int i, j;
1551     int w = cblk->coord[0][1] - cblk->coord[0][0];
1552     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) {
1553         float *datap = &comp->f_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x];
1554         int *src = t1->data + j*t1->stride;
1555         for (i = 0; i < w; ++i)
1556             datap[i] = src[i] * band->f_stepsize;
1557     }
1558 }
1559
1560 /* Integer dequantization of a codeblock.*/
1561 static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk,
1562                                Jpeg2000Component *comp,
1563                                Jpeg2000T1Context *t1, Jpeg2000Band *band)
1564 {
1565     int i, j;
1566     int w = cblk->coord[0][1] - cblk->coord[0][0];
1567     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) {
1568         int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x];
1569         int *src = t1->data + j*t1->stride;
1570         if (band->i_stepsize == 32768) {
1571             for (i = 0; i < w; ++i)
1572                 datap[i] = src[i] / 2;
1573         } else {
1574             // This should be VERY uncommon
1575             for (i = 0; i < w; ++i)
1576                 datap[i] = (src[i] * (int64_t)band->i_stepsize) / 65536;
1577         }
1578     }
1579 }
1580
1581 static void dequantization_int_97(int x, int y, Jpeg2000Cblk *cblk,
1582                                Jpeg2000Component *comp,
1583                                Jpeg2000T1Context *t1, Jpeg2000Band *band)
1584 {
1585     int i, j;
1586     int w = cblk->coord[0][1] - cblk->coord[0][0];
1587     for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) {
1588         int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x];
1589         int *src = t1->data + j*t1->stride;
1590         for (i = 0; i < w; ++i)
1591             datap[i] = (src[i] * (int64_t)band->i_stepsize + (1<<15)) >> 16;
1592     }
1593 }
1594
1595 static inline void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
1596 {
1597     int i, csize = 1;
1598     void *src[3];
1599
1600     for (i = 1; i < 3; i++) {
1601         if (tile->codsty[0].transform != tile->codsty[i].transform) {
1602             av_log(s->avctx, AV_LOG_ERROR, "Transforms mismatch, MCT not supported\n");
1603             return;
1604         }
1605         if (memcmp(tile->comp[0].coord, tile->comp[i].coord, sizeof(tile->comp[0].coord))) {
1606             av_log(s->avctx, AV_LOG_ERROR, "Coords mismatch, MCT not supported\n");
1607             return;
1608         }
1609     }
1610
1611     for (i = 0; i < 3; i++)
1612         if (tile->codsty[0].transform == FF_DWT97)
1613             src[i] = tile->comp[i].f_data;
1614         else
1615             src[i] = tile->comp[i].i_data;
1616
1617     for (i = 0; i < 2; i++)
1618         csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
1619
1620     s->dsp.mct_decode[tile->codsty[0].transform](src[0], src[1], src[2], csize);
1621 }
1622
1623 static inline void tile_codeblocks(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
1624 {
1625     Jpeg2000T1Context t1;
1626
1627     int compno, reslevelno, bandno;
1628
1629     /* Loop on tile components */
1630     for (compno = 0; compno < s->ncomponents; compno++) {
1631         Jpeg2000Component *comp     = tile->comp + compno;
1632         Jpeg2000CodingStyle *codsty = tile->codsty + compno;
1633
1634         t1.stride = (1<<codsty->log2_cblk_width) + 2;
1635
1636         /* Loop on resolution levels */
1637         for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) {
1638             Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno;
1639             /* Loop on bands */
1640             for (bandno = 0; bandno < rlevel->nbands; bandno++) {
1641                 int nb_precincts, precno;
1642                 Jpeg2000Band *band = rlevel->band + bandno;
1643                 int cblkno = 0, bandpos;
1644
1645                 bandpos = bandno + (reslevelno > 0);
1646
1647                 if (band->coord[0][0] == band->coord[0][1] ||
1648                     band->coord[1][0] == band->coord[1][1])
1649                     continue;
1650
1651                 nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y;
1652                 /* Loop on precincts */
1653                 for (precno = 0; precno < nb_precincts; precno++) {
1654                     Jpeg2000Prec *prec = band->prec + precno;
1655
1656                     /* Loop on codeblocks */
1657                     for (cblkno = 0;
1658                          cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height;
1659                          cblkno++) {
1660                         int x, y;
1661                         Jpeg2000Cblk *cblk = prec->cblk + cblkno;
1662                         decode_cblk(s, codsty, &t1, cblk,
1663                                     cblk->coord[0][1] - cblk->coord[0][0],
1664                                     cblk->coord[1][1] - cblk->coord[1][0],
1665                                     bandpos);
1666
1667                         x = cblk->coord[0][0] - band->coord[0][0];
1668                         y = cblk->coord[1][0] - band->coord[1][0];
1669
1670                         if (codsty->transform == FF_DWT97)
1671                             dequantization_float(x, y, cblk, comp, &t1, band);
1672                         else if (codsty->transform == FF_DWT97_INT)
1673                             dequantization_int_97(x, y, cblk, comp, &t1, band);
1674                         else
1675                             dequantization_int(x, y, cblk, comp, &t1, band);
1676                    } /* end cblk */
1677                 } /*end prec */
1678             } /* end band */
1679         } /* end reslevel */
1680
1681         /* inverse DWT */
1682         ff_dwt_decode(&comp->dwt, codsty->transform == FF_DWT97 ? (void*)comp->f_data : (void*)comp->i_data);
1683     } /*end comp */
1684 }
1685
1686 #define WRITE_FRAME(D, PIXEL)                                                                     \
1687     static inline void write_frame_ ## D(Jpeg2000DecoderContext * s, Jpeg2000Tile * tile,         \
1688                                          AVFrame * picture, int precision)                        \
1689     {                                                                                             \
1690         const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(s->avctx->pix_fmt);               \
1691         int planar    = !!(pixdesc->flags & AV_PIX_FMT_FLAG_PLANAR);                              \
1692         int pixelsize = planar ? 1 : pixdesc->nb_components;                                      \
1693                                                                                                   \
1694         int compno;                                                                               \
1695         int x, y;                                                                                 \
1696                                                                                                   \
1697         for (compno = 0; compno < s->ncomponents; compno++) {                                     \
1698             Jpeg2000Component *comp     = tile->comp + compno;                                    \
1699             Jpeg2000CodingStyle *codsty = tile->codsty + compno;                                  \
1700             PIXEL *line;                                                                          \
1701             float *datap     = comp->f_data;                                                      \
1702             int32_t *i_datap = comp->i_data;                                                      \
1703             int cbps         = s->cbps[compno];                                                   \
1704             int w            = tile->comp[compno].coord[0][1] - s->image_offset_x;                \
1705             int plane        = 0;                                                                 \
1706                                                                                                   \
1707             if (planar)                                                                           \
1708                 plane = s->cdef[compno] ? s->cdef[compno]-1 : (s->ncomponents-1);                 \
1709                                                                                                   \
1710             y    = tile->comp[compno].coord[1][0] - s->image_offset_y / s->cdy[compno];           \
1711             line = (PIXEL *)picture->data[plane] + y * (picture->linesize[plane] / sizeof(PIXEL));\
1712             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y++) {                 \
1713                 PIXEL *dst;                                                                       \
1714                                                                                                   \
1715                 x   = tile->comp[compno].coord[0][0] - s->image_offset_x / s->cdx[compno];        \
1716                 dst = line + x * pixelsize + compno*!planar;                                      \
1717                                                                                                   \
1718                 if (codsty->transform == FF_DWT97) {                                              \
1719                     for (; x < w; x++) {                                                          \
1720                         int val = lrintf(*datap) + (1 << (cbps - 1));                             \
1721                         /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */                  \
1722                         val  = av_clip(val, 0, (1 << cbps) - 1);                                  \
1723                         *dst = val << (precision - cbps);                                         \
1724                         datap++;                                                                  \
1725                         dst += pixelsize;                                                         \
1726                     }                                                                             \
1727                 } else {                                                                          \
1728                     for (; x < w; x++) {                                                          \
1729                         int val = *i_datap + (1 << (cbps - 1));                                   \
1730                         /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */                  \
1731                         val  = av_clip(val, 0, (1 << cbps) - 1);                                  \
1732                         *dst = val << (precision - cbps);                                         \
1733                         i_datap++;                                                                \
1734                         dst += pixelsize;                                                         \
1735                     }                                                                             \
1736                 }                                                                                 \
1737                 line += picture->linesize[plane] / sizeof(PIXEL);                                 \
1738             }                                                                                     \
1739         }                                                                                         \
1740                                                                                                   \
1741     }
1742
1743 WRITE_FRAME(8, uint8_t)
1744 WRITE_FRAME(16, uint16_t)
1745
1746 #undef WRITE_FRAME
1747
1748 static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
1749                                 AVFrame *picture)
1750 {
1751     int x;
1752
1753     tile_codeblocks(s, tile);
1754
1755     /* inverse MCT transformation */
1756     if (tile->codsty[0].mct)
1757         mct_decode(s, tile);
1758
1759     if (s->cdef[0] < 0) {
1760         for (x = 0; x < s->ncomponents; x++)
1761             s->cdef[x] = x + 1;
1762         if ((s->ncomponents & 1) == 0)
1763             s->cdef[s->ncomponents-1] = 0;
1764     }
1765
1766     if (s->precision <= 8) {
1767         write_frame_8(s, tile, picture, 8);
1768     } else {
1769         int precision = picture->format == AV_PIX_FMT_XYZ12 ||
1770                         picture->format == AV_PIX_FMT_RGB48 ||
1771                         picture->format == AV_PIX_FMT_RGBA64 ||
1772                         picture->format == AV_PIX_FMT_GRAY16 ? 16 : s->precision;
1773
1774         write_frame_16(s, tile, picture, precision);
1775     }
1776
1777     return 0;
1778 }
1779
1780 static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s)
1781 {
1782     int tileno, compno;
1783     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1784         if (s->tile[tileno].comp) {
1785             for (compno = 0; compno < s->ncomponents; compno++) {
1786                 Jpeg2000Component *comp     = s->tile[tileno].comp   + compno;
1787                 Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno;
1788
1789                 ff_jpeg2000_cleanup(comp, codsty);
1790             }
1791             av_freep(&s->tile[tileno].comp);
1792         }
1793     }
1794     av_freep(&s->tile);
1795     memset(s->codsty, 0, sizeof(s->codsty));
1796     memset(s->qntsty, 0, sizeof(s->qntsty));
1797     memset(s->properties, 0, sizeof(s->properties));
1798     memset(&s->poc  , 0, sizeof(s->poc));
1799     s->numXtiles = s->numYtiles = 0;
1800     s->ncomponents = 0;
1801 }
1802
1803 static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s)
1804 {
1805     Jpeg2000CodingStyle *codsty = s->codsty;
1806     Jpeg2000QuantStyle *qntsty  = s->qntsty;
1807     Jpeg2000POC         *poc    = &s->poc;
1808     uint8_t *properties         = s->properties;
1809
1810     for (;;) {
1811         int len, ret = 0;
1812         uint16_t marker;
1813         int oldpos;
1814
1815         if (bytestream2_get_bytes_left(&s->g) < 2) {
1816             av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
1817             break;
1818         }
1819
1820         marker = bytestream2_get_be16u(&s->g);
1821         oldpos = bytestream2_tell(&s->g);
1822
1823         if (marker == JPEG2000_SOD) {
1824             Jpeg2000Tile *tile;
1825             Jpeg2000TilePart *tp;
1826
1827             if (!s->tile) {
1828                 av_log(s->avctx, AV_LOG_ERROR, "Missing SIZ\n");
1829                 return AVERROR_INVALIDDATA;
1830             }
1831             if (s->curtileno < 0) {
1832                 av_log(s->avctx, AV_LOG_ERROR, "Missing SOT\n");
1833                 return AVERROR_INVALIDDATA;
1834             }
1835
1836             tile = s->tile + s->curtileno;
1837             tp = tile->tile_part + tile->tp_idx;
1838             if (tp->tp_end < s->g.buffer) {
1839                 av_log(s->avctx, AV_LOG_ERROR, "Invalid tpend\n");
1840                 return AVERROR_INVALIDDATA;
1841             }
1842             bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_end - s->g.buffer);
1843             bytestream2_skip(&s->g, tp->tp_end - s->g.buffer);
1844
1845             continue;
1846         }
1847         if (marker == JPEG2000_EOC)
1848             break;
1849
1850         len = bytestream2_get_be16(&s->g);
1851         if (len < 2 || bytestream2_get_bytes_left(&s->g) < len - 2) {
1852             av_log(s->avctx, AV_LOG_ERROR, "Invalid len %d left=%d\n", len, bytestream2_get_bytes_left(&s->g));
1853             return AVERROR_INVALIDDATA;
1854         }
1855
1856         switch (marker) {
1857         case JPEG2000_SIZ:
1858             if (s->ncomponents) {
1859                 av_log(s->avctx, AV_LOG_ERROR, "Duplicate SIZ\n");
1860                 return AVERROR_INVALIDDATA;
1861             }
1862             ret = get_siz(s);
1863             if (!s->tile)
1864                 s->numXtiles = s->numYtiles = 0;
1865             break;
1866         case JPEG2000_COC:
1867             ret = get_coc(s, codsty, properties);
1868             break;
1869         case JPEG2000_COD:
1870             ret = get_cod(s, codsty, properties);
1871             break;
1872         case JPEG2000_QCC:
1873             ret = get_qcc(s, len, qntsty, properties);
1874             break;
1875         case JPEG2000_QCD:
1876             ret = get_qcd(s, len, qntsty, properties);
1877             break;
1878         case JPEG2000_POC:
1879             ret = get_poc(s, len, poc);
1880             break;
1881         case JPEG2000_SOT:
1882             if (!(ret = get_sot(s, len))) {
1883                 av_assert1(s->curtileno >= 0);
1884                 codsty = s->tile[s->curtileno].codsty;
1885                 qntsty = s->tile[s->curtileno].qntsty;
1886                 poc    = &s->tile[s->curtileno].poc;
1887                 properties = s->tile[s->curtileno].properties;
1888             }
1889             break;
1890         case JPEG2000_PLM:
1891             // the PLM marker is ignored
1892         case JPEG2000_COM:
1893             // the comment is ignored
1894             bytestream2_skip(&s->g, len - 2);
1895             break;
1896         case JPEG2000_TLM:
1897             // Tile-part lengths
1898             ret = get_tlm(s, len);
1899             break;
1900         case JPEG2000_PLT:
1901             // Packet length, tile-part header
1902             ret = get_plt(s, len);
1903             break;
1904         default:
1905             av_log(s->avctx, AV_LOG_ERROR,
1906                    "unsupported marker 0x%.4"PRIX16" at pos 0x%X\n",
1907                    marker, bytestream2_tell(&s->g) - 4);
1908             bytestream2_skip(&s->g, len - 2);
1909             break;
1910         }
1911         if (bytestream2_tell(&s->g) - oldpos != len || ret) {
1912             av_log(s->avctx, AV_LOG_ERROR,
1913                    "error during processing marker segment %.4"PRIx16"\n",
1914                    marker);
1915             return ret ? ret : -1;
1916         }
1917     }
1918     return 0;
1919 }
1920
1921 /* Read bit stream packets --> T2 operation. */
1922 static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s)
1923 {
1924     int ret = 0;
1925     int tileno;
1926
1927     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) {
1928         Jpeg2000Tile *tile = s->tile + tileno;
1929
1930         if ((ret = init_tile(s, tileno)) < 0)
1931             return ret;
1932
1933         s->g = tile->tile_part[0].tpg;
1934         if ((ret = jpeg2000_decode_packets(s, tile)) < 0)
1935             return ret;
1936     }
1937
1938     return 0;
1939 }
1940
1941 static int jp2_find_codestream(Jpeg2000DecoderContext *s)
1942 {
1943     uint32_t atom_size, atom, atom_end;
1944     int search_range = 10;
1945
1946     while (search_range
1947            &&
1948            bytestream2_get_bytes_left(&s->g) >= 8) {
1949         atom_size = bytestream2_get_be32u(&s->g);
1950         atom      = bytestream2_get_be32u(&s->g);
1951         atom_end  = bytestream2_tell(&s->g) + atom_size - 8;
1952
1953         if (atom == JP2_CODESTREAM)
1954             return 1;
1955
1956         if (bytestream2_get_bytes_left(&s->g) < atom_size || atom_end < atom_size)
1957             return 0;
1958
1959         if (atom == JP2_HEADER &&
1960                    atom_size >= 16) {
1961             uint32_t atom2_size, atom2, atom2_end;
1962             do {
1963                 atom2_size = bytestream2_get_be32u(&s->g);
1964                 atom2      = bytestream2_get_be32u(&s->g);
1965                 atom2_end  = bytestream2_tell(&s->g) + atom2_size - 8;
1966                 if (atom2_size < 8 || atom2_end > atom_end || atom2_end < atom2_size)
1967                     break;
1968                 if (atom2 == JP2_CODESTREAM) {
1969                     return 1;
1970                 } else if (atom2 == MKBETAG('c','o','l','r') && atom2_size >= 7) {
1971                     int method = bytestream2_get_byteu(&s->g);
1972                     bytestream2_skipu(&s->g, 2);
1973                     if (method == 1) {
1974                         s->colour_space = bytestream2_get_be32u(&s->g);
1975                     }
1976                 } else if (atom2 == MKBETAG('p','c','l','r') && atom2_size >= 6) {
1977                     int i, size, colour_count, colour_channels, colour_depth[3];
1978                     uint32_t r, g, b;
1979                     colour_count = bytestream2_get_be16u(&s->g);
1980                     colour_channels = bytestream2_get_byteu(&s->g);
1981                     // FIXME: Do not ignore channel_sign
1982                     colour_depth[0] = (bytestream2_get_byteu(&s->g) & 0x7f) + 1;
1983                     colour_depth[1] = (bytestream2_get_byteu(&s->g) & 0x7f) + 1;
1984                     colour_depth[2] = (bytestream2_get_byteu(&s->g) & 0x7f) + 1;
1985                     size = (colour_depth[0] + 7 >> 3) * colour_count +
1986                            (colour_depth[1] + 7 >> 3) * colour_count +
1987                            (colour_depth[2] + 7 >> 3) * colour_count;
1988                     if (colour_count > 256   ||
1989                         colour_channels != 3 ||
1990                         colour_depth[0] > 16 ||
1991                         colour_depth[1] > 16 ||
1992                         colour_depth[2] > 16 ||
1993                         atom2_size < size) {
1994                         avpriv_request_sample(s->avctx, "Unknown palette");
1995                         bytestream2_seek(&s->g, atom2_end, SEEK_SET);
1996                         continue;
1997                     }
1998                     s->pal8 = 1;
1999                     for (i = 0; i < colour_count; i++) {
2000                         if (colour_depth[0] <= 8) {
2001                             r = bytestream2_get_byteu(&s->g) << 8 - colour_depth[0];
2002                             r |= r >> colour_depth[0];
2003                         } else {
2004                             r = bytestream2_get_be16u(&s->g) >> colour_depth[0] - 8;
2005                         }
2006                         if (colour_depth[1] <= 8) {
2007                             g = bytestream2_get_byteu(&s->g) << 8 - colour_depth[1];
2008                             r |= r >> colour_depth[1];
2009                         } else {
2010                             g = bytestream2_get_be16u(&s->g) >> colour_depth[1] - 8;
2011                         }
2012                         if (colour_depth[2] <= 8) {
2013                             b = bytestream2_get_byteu(&s->g) << 8 - colour_depth[2];
2014                             r |= r >> colour_depth[2];
2015                         } else {
2016                             b = bytestream2_get_be16u(&s->g) >> colour_depth[2] - 8;
2017                         }
2018                         s->palette[i] = 0xffu << 24 | r << 16 | g << 8 | b;
2019                     }
2020                 } else if (atom2 == MKBETAG('c','d','e','f') && atom2_size >= 2) {
2021                     int n = bytestream2_get_be16u(&s->g);
2022                     for (; n>0; n--) {
2023                         int cn   = bytestream2_get_be16(&s->g);
2024                         int av_unused typ  = bytestream2_get_be16(&s->g);
2025                         int asoc = bytestream2_get_be16(&s->g);
2026                         if (cn < 4 && asoc < 4)
2027                             s->cdef[cn] = asoc;
2028                     }
2029                 }
2030                 bytestream2_seek(&s->g, atom2_end, SEEK_SET);
2031             } while (atom_end - atom2_end >= 8);
2032         } else {
2033             search_range--;
2034         }
2035         bytestream2_seek(&s->g, atom_end, SEEK_SET);
2036     }
2037
2038     return 0;
2039 }
2040
2041 static av_cold int jpeg2000_decode_init(AVCodecContext *avctx)
2042 {
2043     Jpeg2000DecoderContext *s = avctx->priv_data;
2044
2045     ff_jpeg2000dsp_init(&s->dsp);
2046
2047     return 0;
2048 }
2049
2050 static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
2051                                  int *got_frame, AVPacket *avpkt)
2052 {
2053     Jpeg2000DecoderContext *s = avctx->priv_data;
2054     ThreadFrame frame = { .f = data };
2055     AVFrame *picture = data;
2056     int tileno, ret;
2057
2058     s->avctx     = avctx;
2059     bytestream2_init(&s->g, avpkt->data, avpkt->size);
2060     s->curtileno = -1;
2061     memset(s->cdef, -1, sizeof(s->cdef));
2062
2063     if (bytestream2_get_bytes_left(&s->g) < 2) {
2064         ret = AVERROR_INVALIDDATA;
2065         goto end;
2066     }
2067
2068     // check if the image is in jp2 format
2069     if (bytestream2_get_bytes_left(&s->g) >= 12 &&
2070        (bytestream2_get_be32u(&s->g) == 12) &&
2071        (bytestream2_get_be32u(&s->g) == JP2_SIG_TYPE) &&
2072        (bytestream2_get_be32u(&s->g) == JP2_SIG_VALUE)) {
2073         if (!jp2_find_codestream(s)) {
2074             av_log(avctx, AV_LOG_ERROR,
2075                    "Could not find Jpeg2000 codestream atom.\n");
2076             ret = AVERROR_INVALIDDATA;
2077             goto end;
2078         }
2079     } else {
2080         bytestream2_seek(&s->g, 0, SEEK_SET);
2081     }
2082
2083     while (bytestream2_get_bytes_left(&s->g) >= 3 && bytestream2_peek_be16(&s->g) != JPEG2000_SOC)
2084         bytestream2_skip(&s->g, 1);
2085
2086     if (bytestream2_get_be16u(&s->g) != JPEG2000_SOC) {
2087         av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
2088         ret = AVERROR_INVALIDDATA;
2089         goto end;
2090     }
2091     if (ret = jpeg2000_read_main_headers(s))
2092         goto end;
2093
2094     /* get picture buffer */
2095     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
2096         goto end;
2097     picture->pict_type = AV_PICTURE_TYPE_I;
2098     picture->key_frame = 1;
2099
2100     if (ret = jpeg2000_read_bitstream_packets(s))
2101         goto end;
2102
2103     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
2104         if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture))
2105             goto end;
2106
2107     jpeg2000_dec_cleanup(s);
2108
2109     *got_frame = 1;
2110
2111     if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
2112         memcpy(picture->data[1], s->palette, 256 * sizeof(uint32_t));
2113
2114     return bytestream2_tell(&s->g);
2115
2116 end:
2117     jpeg2000_dec_cleanup(s);
2118     return ret;
2119 }
2120
2121 static av_cold void jpeg2000_init_static_data(AVCodec *codec)
2122 {
2123     ff_jpeg2000_init_tier1_luts();
2124     ff_mqc_init_context_tables();
2125 }
2126
2127 #define OFFSET(x) offsetof(Jpeg2000DecoderContext, x)
2128 #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
2129
2130 static const AVOption options[] = {
2131     { "lowres",  "Lower the decoding resolution by a power of two",
2132         OFFSET(reduction_factor), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
2133     { NULL },
2134 };
2135
2136 static const AVProfile profiles[] = {
2137     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0,  "JPEG 2000 codestream restriction 0"   },
2138     { FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1,  "JPEG 2000 codestream restriction 1"   },
2139     { FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
2140     { FF_PROFILE_JPEG2000_DCINEMA_2K,             "JPEG 2000 digital cinema 2K"          },
2141     { FF_PROFILE_JPEG2000_DCINEMA_4K,             "JPEG 2000 digital cinema 4K"          },
2142     { FF_PROFILE_UNKNOWN },
2143 };
2144
2145 static const AVClass jpeg2000_class = {
2146     .class_name = "jpeg2000",
2147     .item_name  = av_default_item_name,
2148     .option     = options,
2149     .version    = LIBAVUTIL_VERSION_INT,
2150 };
2151
2152 AVCodec ff_jpeg2000_decoder = {
2153     .name             = "jpeg2000",
2154     .long_name        = NULL_IF_CONFIG_SMALL("JPEG 2000"),
2155     .type             = AVMEDIA_TYPE_VIDEO,
2156     .id               = AV_CODEC_ID_JPEG2000,
2157     .capabilities     = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_DR1,
2158     .priv_data_size   = sizeof(Jpeg2000DecoderContext),
2159     .init_static_data = jpeg2000_init_static_data,
2160     .init             = jpeg2000_decode_init,
2161     .decode           = jpeg2000_decode_frame,
2162     .priv_class       = &jpeg2000_class,
2163     .max_lowres       = 5,
2164     .profiles         = NULL_IF_CONFIG_SMALL(profiles)
2165 };