FFmpeg: libavcodec/j2kdec.c Source File

00001 /*
00002  * JPEG2000 image decoder
00003  * Copyright (c) 2007 Kamil Nowosad
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 // #define DEBUG
00029 
00030 #include "avcodec.h"
00031 #include "bytestream.h"
00032 #include "j2k.h"
00033 #include "libavutil/common.h"
00034 
00035 #define JP2_SIG_TYPE    0x6A502020
00036 #define JP2_SIG_VALUE   0x0D0A870A
00037 #define JP2_CODESTREAM  0x6A703263
00038 
00039 #define HAD_COC 0x01
00040 #define HAD_QCC 0x02
00041 
00042 typedef struct {
00043    J2kComponent *comp;
00044    uint8_t properties[4];
00045    J2kCodingStyle codsty[4];
00046    J2kQuantStyle  qntsty[4];
00047 } J2kTile;
00048 
00049 typedef struct {
00050     AVCodecContext *avctx;
00051     AVFrame picture;
00052     GetByteContext g;
00053 
00054     int width, height; 
00055     int image_offset_x, image_offset_y;
00056     int tile_offset_x, tile_offset_y;
00057     uint8_t cbps[4]; 
00058     uint8_t sgnd[4]; 
00059     uint8_t properties[4];
00060     int cdx[4], cdy[4];
00061     int precision;
00062     int ncomponents;
00063     int tile_width, tile_height; 
00064     int numXtiles, numYtiles;
00065     int maxtilelen;
00066 
00067     J2kCodingStyle codsty[4];
00068     J2kQuantStyle  qntsty[4];
00069 
00070     int bit_index;
00071 
00072     int16_t curtileno;
00073 
00074     J2kTile *tile;
00075 } J2kDecoderContext;
00076 
00077 static int get_bits(J2kDecoderContext *s, int n)
00078 {
00079     int res = 0;
00080 
00081     while (--n >= 0){
00082         res <<= 1;
00083         if (s->bit_index == 0) {
00084             s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu);
00085         }
00086         s->bit_index--;
00087         res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1;
00088     }
00089     return res;
00090 }
00091 
00092 static void j2k_flush(J2kDecoderContext *s)
00093 {
00094     if (bytestream2_get_byte(&s->g) == 0xff)
00095         bytestream2_skip(&s->g, 1);
00096     s->bit_index = 8;
00097 }
00098 #if 0
00099 void printcomp(J2kComponent *comp)
00100 {
00101     int i;
00102     for (i = 0; i < comp->y1 - comp->y0; i++)
00103         ff_j2k_printv(comp->data + i * (comp->x1 - comp->x0), comp->x1 - comp->x0);
00104 }
00105 
00106 static void nspaces(FILE *fd, int n)
00107 {
00108     while(n--) putc(' ', fd);
00109 }
00110 
00111 static void dump(J2kDecoderContext *s, FILE *fd)
00112 {
00113     int tileno, compno, reslevelno, bandno, precno;
00114     fprintf(fd, "XSiz = %d, YSiz = %d, tile_width = %d, tile_height = %d\n"
00115                 "numXtiles = %d, numYtiles = %d, ncomponents = %d\n"
00116                 "tiles:\n",
00117             s->width, s->height, s->tile_width, s->tile_height,
00118             s->numXtiles, s->numYtiles, s->ncomponents);
00119     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){
00120         J2kTile *tile = s->tile + tileno;
00121         nspaces(fd, 2);
00122         fprintf(fd, "tile %d:\n", tileno);
00123         for(compno = 0; compno < s->ncomponents; compno++){
00124             J2kComponent *comp = tile->comp + compno;
00125             nspaces(fd, 4);
00126             fprintf(fd, "component %d:\n", compno);
00127             nspaces(fd, 4);
00128             fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d\n",
00129                         comp->x0, comp->x1, comp->y0, comp->y1);
00130             for(reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
00131                 J2kResLevel *reslevel = comp->reslevel + reslevelno;
00132                 nspaces(fd, 6);
00133                 fprintf(fd, "reslevel %d:\n", reslevelno);
00134                 nspaces(fd, 6);
00135                 fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d, nbands = %d\n",
00136                         reslevel->x0, reslevel->x1, reslevel->y0,
00137                         reslevel->y1, reslevel->nbands);
00138                 for(bandno = 0; bandno < reslevel->nbands; bandno++){
00139                     J2kBand *band = reslevel->band + bandno;
00140                     nspaces(fd, 8);
00141                     fprintf(fd, "band %d:\n", bandno);
00142                     nspaces(fd, 8);
00143                     fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d,"
00144                                 "codeblock_width = %d, codeblock_height = %d cblknx = %d cblkny = %d\n",
00145                                 band->x0, band->x1,
00146                                 band->y0, band->y1,
00147                                 band->codeblock_width, band->codeblock_height,
00148                                 band->cblknx, band->cblkny);
00149                     for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
00150                         J2kPrec *prec = band->prec + precno;
00151                         nspaces(fd, 10);
00152                         fprintf(fd, "prec %d:\n", precno);
00153                         nspaces(fd, 10);
00154                         fprintf(fd, "xi0 = %d, xi1 = %d, yi0 = %d, yi1 = %d\n",
00155                                      prec->xi0, prec->xi1, prec->yi0, prec->yi1);
00156                     }
00157                 }
00158             }
00159         }
00160     }
00161 }
00162 #endif
00163 
00165 static int tag_tree_decode(J2kDecoderContext *s, J2kTgtNode *node, int threshold)
00166 {
00167     J2kTgtNode *stack[30];
00168     int sp = -1, curval = 0;
00169 
00170     while(node && !node->vis){
00171         stack[++sp] = node;
00172         node = node->parent;
00173     }
00174 
00175     if (node)
00176         curval = node->val;
00177     else
00178         curval = stack[sp]->val;
00179 
00180     while(curval < threshold && sp >= 0){
00181         if (curval < stack[sp]->val)
00182             curval = stack[sp]->val;
00183         while (curval < threshold){
00184             int ret;
00185             if ((ret = get_bits(s, 1)) > 0){
00186                 stack[sp]->vis++;
00187                 break;
00188             } else if (!ret)
00189                 curval++;
00190             else
00191                 return ret;
00192         }
00193         stack[sp]->val = curval;
00194         sp--;
00195     }
00196     return curval;
00197 }
00198 
00199 /* marker segments */
00201 static int get_siz(J2kDecoderContext *s)
00202 {
00203     int i, ret;
00204 
00205     if (bytestream2_get_bytes_left(&s->g) < 36)
00206         return AVERROR(EINVAL);
00207 
00208                         bytestream2_get_be16u(&s->g); // Rsiz (skipped)
00209              s->width = bytestream2_get_be32u(&s->g); // width
00210             s->height = bytestream2_get_be32u(&s->g); // height
00211     s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
00212     s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
00213 
00214         s->tile_width = bytestream2_get_be32u(&s->g); // XTSiz
00215        s->tile_height = bytestream2_get_be32u(&s->g); // YTSiz
00216      s->tile_offset_x = bytestream2_get_be32u(&s->g); // XT0Siz
00217      s->tile_offset_y = bytestream2_get_be32u(&s->g); // YT0Siz
00218        s->ncomponents = bytestream2_get_be16u(&s->g); // CSiz
00219 
00220     if(s->tile_width<=0 || s->tile_height<=0)
00221         return AVERROR(EINVAL);
00222 
00223     if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
00224         return AVERROR(EINVAL);
00225 
00226     for (i = 0; i < s->ncomponents; i++){ // Ssiz_i XRsiz_i, YRsiz_i
00227         uint8_t x = bytestream2_get_byteu(&s->g);
00228         s->cbps[i] = (x & 0x7f) + 1;
00229         s->precision = FFMAX(s->cbps[i], s->precision);
00230         s->sgnd[i] = !!(x & 0x80);
00231         s->cdx[i] = bytestream2_get_byteu(&s->g);
00232         s->cdy[i] = bytestream2_get_byteu(&s->g);
00233     }
00234 
00235     s->numXtiles = ff_j2k_ceildiv(s->width - s->tile_offset_x, s->tile_width);
00236     s->numYtiles = ff_j2k_ceildiv(s->height - s->tile_offset_y, s->tile_height);
00237 
00238     if(s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(J2kTile))
00239         return AVERROR(EINVAL);
00240 
00241     s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(J2kTile));
00242     if (!s->tile)
00243         return AVERROR(ENOMEM);
00244 
00245     for (i = 0; i < s->numXtiles * s->numYtiles; i++){
00246         J2kTile *tile = s->tile + i;
00247 
00248         tile->comp = av_mallocz(s->ncomponents * sizeof(J2kComponent));
00249         if (!tile->comp)
00250             return AVERROR(ENOMEM);
00251     }
00252 
00253     s->avctx->width  = s->width  - s->image_offset_x;
00254     s->avctx->height = s->height - s->image_offset_y;
00255 
00256     switch(s->ncomponents){
00257     case 1:
00258         if (s->precision > 8) {
00259             s->avctx->pix_fmt = PIX_FMT_GRAY16;
00260         } else {
00261             s->avctx->pix_fmt = PIX_FMT_GRAY8;
00262         }
00263         break;
00264     case 3:
00265         if (s->precision > 8) {
00266             s->avctx->pix_fmt = PIX_FMT_RGB48;
00267         } else {
00268             s->avctx->pix_fmt = PIX_FMT_RGB24;
00269         }
00270         break;
00271     case 4:
00272         s->avctx->pix_fmt = PIX_FMT_RGBA;
00273         break;
00274     }
00275 
00276     if (s->picture.data[0])
00277         s->avctx->release_buffer(s->avctx, &s->picture);
00278 
00279     if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0)
00280         return ret;
00281 
00282     s->picture.pict_type = AV_PICTURE_TYPE_I;
00283     s->picture.key_frame = 1;
00284 
00285     return 0;
00286 }
00287 
00289 static int get_cox(J2kDecoderContext *s, J2kCodingStyle *c)
00290 {
00291     if (bytestream2_get_bytes_left(&s->g) < 5)
00292         return AVERROR(EINVAL);
00293           c->nreslevels = bytestream2_get_byteu(&s->g) + 1; // num of resolution levels - 1
00294      c->log2_cblk_width = bytestream2_get_byteu(&s->g) + 2; // cblk width
00295     c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height
00296 
00297     c->cblk_style = bytestream2_get_byteu(&s->g);
00298     if (c->cblk_style != 0){ // cblk style
00299         av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
00300     }
00301     c->transform = bytestream2_get_byteu(&s->g); // transformation
00302     if (c->csty & J2K_CSTY_PREC) {
00303         int i;
00304 
00305         for (i = 0; i < c->nreslevels; i++)
00306             bytestream2_get_byte(&s->g);
00307     }
00308     return 0;
00309 }
00310 
00312 static int get_cod(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
00313 {
00314     J2kCodingStyle tmp;
00315     int compno;
00316 
00317     if (bytestream2_get_bytes_left(&s->g) < 5)
00318         return AVERROR(EINVAL);
00319 
00320     tmp.log2_prec_width  =
00321     tmp.log2_prec_height = 15;
00322 
00323     tmp.csty = bytestream2_get_byteu(&s->g);
00324 
00325     if (bytestream2_get_byteu(&s->g)){ // progression level
00326         av_log(s->avctx, AV_LOG_ERROR, "only LRCP progression supported\n");
00327         return -1;
00328     }
00329 
00330     tmp.nlayers = bytestream2_get_be16u(&s->g);
00331         tmp.mct = bytestream2_get_byteu(&s->g); // multiple component transformation
00332 
00333     get_cox(s, &tmp);
00334     for (compno = 0; compno < s->ncomponents; compno++){
00335         if (!(properties[compno] & HAD_COC))
00336             memcpy(c + compno, &tmp, sizeof(J2kCodingStyle));
00337     }
00338     return 0;
00339 }
00340 
00342 static int get_coc(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
00343 {
00344     int compno;
00345 
00346     if (bytestream2_get_bytes_left(&s->g) < 2)
00347         return AVERROR(EINVAL);
00348 
00349     compno = bytestream2_get_byteu(&s->g);
00350 
00351     c += compno;
00352     c->csty = bytestream2_get_byte(&s->g);
00353     get_cox(s, c);
00354 
00355     properties[compno] |= HAD_COC;
00356     return 0;
00357 }
00358 
00360 static int get_qcx(J2kDecoderContext *s, int n, J2kQuantStyle *q)
00361 {
00362     int i, x;
00363 
00364     if (bytestream2_get_bytes_left(&s->g) < 1)
00365         return AVERROR(EINVAL);
00366 
00367     x = bytestream2_get_byteu(&s->g); // Sqcd
00368 
00369     q->nguardbits = x >> 5;
00370       q->quantsty = x & 0x1f;
00371 
00372     if (q->quantsty == J2K_QSTY_NONE){
00373         n -= 3;
00374         if (bytestream2_get_bytes_left(&s->g) < n || 32*3 < n)
00375             return AVERROR(EINVAL);
00376         for (i = 0; i < n; i++)
00377             q->expn[i] = bytestream2_get_byteu(&s->g) >> 3;
00378     } else if (q->quantsty == J2K_QSTY_SI){
00379         if (bytestream2_get_bytes_left(&s->g) < 2)
00380             return AVERROR(EINVAL);
00381         x = bytestream2_get_be16u(&s->g);
00382         q->expn[0] = x >> 11;
00383         q->mant[0] = x & 0x7ff;
00384         for (i = 1; i < 32 * 3; i++){
00385             int curexpn = FFMAX(0, q->expn[0] - (i-1)/3);
00386             q->expn[i] = curexpn;
00387             q->mant[i] = q->mant[0];
00388         }
00389     } else{
00390         n = (n - 3) >> 1;
00391         if (bytestream2_get_bytes_left(&s->g) < 2 * n || 32*3 < n)
00392             return AVERROR(EINVAL);
00393         for (i = 0; i < n; i++){
00394             x = bytestream2_get_be16u(&s->g);
00395             q->expn[i] = x >> 11;
00396             q->mant[i] = x & 0x7ff;
00397         }
00398     }
00399     return 0;
00400 }
00401 
00403 static int get_qcd(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
00404 {
00405     J2kQuantStyle tmp;
00406     int compno;
00407 
00408     if (get_qcx(s, n, &tmp))
00409         return -1;
00410     for (compno = 0; compno < s->ncomponents; compno++)
00411         if (!(properties[compno] & HAD_QCC))
00412             memcpy(q + compno, &tmp, sizeof(J2kQuantStyle));
00413     return 0;
00414 }
00415 
00417 static int get_qcc(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
00418 {
00419     int compno;
00420 
00421     if (bytestream2_get_bytes_left(&s->g) < 1)
00422         return AVERROR(EINVAL);
00423 
00424     compno = bytestream2_get_byteu(&s->g);
00425     properties[compno] |= HAD_QCC;
00426     return get_qcx(s, n-1, q+compno);
00427 }
00428 
00430 static uint8_t get_sot(J2kDecoderContext *s)
00431 {
00432     if (bytestream2_get_bytes_left(&s->g) < 8)
00433         return AVERROR(EINVAL);
00434 
00435     s->curtileno = bytestream2_get_be16u(&s->g); 
00436     if((unsigned)s->curtileno >= s->numXtiles * s->numYtiles){
00437         s->curtileno=0;
00438         return AVERROR(EINVAL);
00439     }
00440 
00441     bytestream2_skipu(&s->g, 4); 
00442 
00443     if (!bytestream2_get_byteu(&s->g)){ 
00444         J2kTile *tile = s->tile + s->curtileno;
00445 
00446         /* copy defaults */
00447         memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(J2kCodingStyle));
00448         memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(J2kQuantStyle));
00449     }
00450     bytestream2_get_byteu(&s->g); 
00451 
00452     return 0;
00453 }
00454 
00455 static int init_tile(J2kDecoderContext *s, int tileno)
00456 {
00457     int compno,
00458         tilex = tileno % s->numXtiles,
00459         tiley = tileno / s->numXtiles;
00460     J2kTile *tile = s->tile + tileno;
00461 
00462     if (!tile->comp)
00463         return AVERROR(ENOMEM);
00464     for (compno = 0; compno < s->ncomponents; compno++){
00465         J2kComponent *comp = tile->comp + compno;
00466         J2kCodingStyle *codsty = tile->codsty + compno;
00467         J2kQuantStyle  *qntsty = tile->qntsty + compno;
00468         int ret; // global bandno
00469 
00470         comp->coord[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x);
00471         comp->coord[0][1] = FFMIN((tilex+1)*s->tile_width + s->tile_offset_x, s->width);
00472         comp->coord[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y);
00473         comp->coord[1][1] = FFMIN((tiley+1)*s->tile_height + s->tile_offset_y, s->height);
00474 
00475         if (ret = ff_j2k_init_component(comp, codsty, qntsty, s->cbps[compno], s->cdx[compno], s->cdy[compno]))
00476             return ret;
00477     }
00478     return 0;
00479 }
00480 
00482 static int getnpasses(J2kDecoderContext *s)
00483 {
00484     int num;
00485     if (!get_bits(s, 1))
00486         return 1;
00487     if (!get_bits(s, 1))
00488         return 2;
00489     if ((num = get_bits(s, 2)) != 3)
00490         return num < 0 ? num : 3 + num;
00491     if ((num = get_bits(s, 5)) != 31)
00492         return num < 0 ? num : 6 + num;
00493     num = get_bits(s, 7);
00494     return num < 0 ? num : 37 + num;
00495 }
00496 
00497 static int getlblockinc(J2kDecoderContext *s)
00498 {
00499     int res = 0, ret;
00500     while (ret = get_bits(s, 1)){
00501         if (ret < 0)
00502             return ret;
00503         res++;
00504     }
00505     return res;
00506 }
00507 
00508 static int decode_packet(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kResLevel *rlevel, int precno,
00509                          int layno, uint8_t *expn, int numgbits)
00510 {
00511     int bandno, cblkny, cblknx, cblkno, ret;
00512 
00513     if (!(ret = get_bits(s, 1))){
00514         j2k_flush(s);
00515         return 0;
00516     } else if (ret < 0)
00517         return ret;
00518 
00519     for (bandno = 0; bandno < rlevel->nbands; bandno++){
00520         J2kBand *band = rlevel->band + bandno;
00521         J2kPrec *prec = band->prec + precno;
00522         int pos = 0;
00523 
00524         if (band->coord[0][0] == band->coord[0][1]
00525         ||  band->coord[1][0] == band->coord[1][1])
00526             continue;
00527 
00528         for (cblkny = prec->yi0; cblkny < prec->yi1; cblkny++)
00529             for(cblknx = prec->xi0, cblkno = cblkny * band->cblknx + cblknx; cblknx < prec->xi1; cblknx++, cblkno++, pos++){
00530                 J2kCblk *cblk = band->cblk + cblkno;
00531                 int incl, newpasses, llen;
00532 
00533                 if (cblk->npasses)
00534                     incl = get_bits(s, 1);
00535                 else
00536                     incl = tag_tree_decode(s, prec->cblkincl + pos, layno+1) == layno;
00537                 if (!incl)
00538                     continue;
00539                 else if (incl < 0)
00540                     return incl;
00541 
00542                 if (!cblk->npasses)
00543                     cblk->nonzerobits = expn[bandno] + numgbits - 1 - tag_tree_decode(s, prec->zerobits + pos, 100);
00544                 if ((newpasses = getnpasses(s)) < 0)
00545                     return newpasses;
00546                 if ((llen = getlblockinc(s)) < 0)
00547                     return llen;
00548                 cblk->lblock += llen;
00549                 if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0)
00550                     return ret;
00551                 cblk->lengthinc = ret;
00552                 cblk->npasses += newpasses;
00553             }
00554     }
00555     j2k_flush(s);
00556 
00557     if (codsty->csty & J2K_CSTY_EPH) {
00558         if (bytestream2_peek_be16(&s->g) == J2K_EPH) {
00559             bytestream2_skip(&s->g, 2);
00560         } else {
00561             av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
00562         }
00563     }
00564 
00565     for (bandno = 0; bandno < rlevel->nbands; bandno++){
00566         J2kBand *band = rlevel->band + bandno;
00567         int yi, cblknw = band->prec[precno].xi1 - band->prec[precno].xi0;
00568         for (yi = band->prec[precno].yi0; yi < band->prec[precno].yi1; yi++){
00569             int xi;
00570             for (xi = band->prec[precno].xi0; xi < band->prec[precno].xi1; xi++){
00571                 J2kCblk *cblk = band->cblk + yi * cblknw + xi;
00572                 if (bytestream2_get_bytes_left(&s->g) < cblk->lengthinc)
00573                     return AVERROR(EINVAL);
00574                 bytestream2_get_bufferu(&s->g, cblk->data, cblk->lengthinc);
00575                 cblk->length += cblk->lengthinc;
00576                 cblk->lengthinc = 0;
00577             }
00578         }
00579     }
00580     return 0;
00581 }
00582 
00583 static int decode_packets(J2kDecoderContext *s, J2kTile *tile)
00584 {
00585     int layno, reslevelno, compno, precno, ok_reslevel;
00586     s->bit_index = 8;
00587     for (layno = 0; layno < tile->codsty[0].nlayers; layno++){
00588         ok_reslevel = 1;
00589         for (reslevelno = 0; ok_reslevel; reslevelno++){
00590             ok_reslevel = 0;
00591             for (compno = 0; compno < s->ncomponents; compno++){
00592                 J2kCodingStyle *codsty = tile->codsty + compno;
00593                 J2kQuantStyle  *qntsty = tile->qntsty + compno;
00594                 if (reslevelno < codsty->nreslevels){
00595                     J2kResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
00596                     ok_reslevel = 1;
00597                     for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
00598                         if (decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn +
00599                                           (reslevelno ? 3*(reslevelno-1)+1 : 0), qntsty->nguardbits))
00600                             return -1;
00601                     }
00602                 }
00603             }
00604         }
00605     }
00606     return 0;
00607 }
00608 
00609 /* TIER-1 routines */
00610 static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol,
00611                            int vert_causal_ctx_csty_symbol)
00612 {
00613     int mask = 3 << (bpno - 1), y0, x, y;
00614 
00615     for (y0 = 0; y0 < height; y0 += 4)
00616         for (x = 0; x < width; x++)
00617             for (y = y0; y < height && y < y0+4; y++){
00618                 if ((t1->flags[y+1][x+1] & J2K_T1_SIG_NB)
00619                 && !(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))){
00620                     int vert_causal_ctx_csty_loc_symbol = vert_causal_ctx_csty_symbol && (x == 3 && y == 3);
00621                     if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno,
00622                                       vert_causal_ctx_csty_loc_symbol))){
00623                         int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
00624                         if (bpass_csty_symbol)
00625                              t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
00626                         else
00627                              t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?
00628                                                -mask : mask;
00629 
00630                         ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0);
00631                     }
00632                     t1->flags[y+1][x+1] |= J2K_T1_VIS;
00633                 }
00634             }
00635 }
00636 
00637 static void decode_refpass(J2kT1Context *t1, int width, int height, int bpno)
00638 {
00639     int phalf, nhalf;
00640     int y0, x, y;
00641 
00642     phalf = 1 << (bpno - 1);
00643     nhalf = -phalf;
00644 
00645     for (y0 = 0; y0 < height; y0 += 4)
00646         for (x = 0; x < width; x++)
00647             for (y = y0; y < height && y < y0+4; y++){
00648                 if ((t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)) == J2K_T1_SIG){
00649                     int ctxno = ff_j2k_getrefctxno(t1->flags[y+1][x+1]);
00650                     int r = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? phalf : nhalf;
00651                     t1->data[y][x] += t1->data[y][x] < 0 ? -r : r;
00652                     t1->flags[y+1][x+1] |= J2K_T1_REF;
00653                 }
00654             }
00655 }
00656 
00657 static void decode_clnpass(J2kDecoderContext *s, J2kT1Context *t1, int width, int height,
00658                            int bpno, int bandno, int seg_symbols)
00659 {
00660     int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;
00661 
00662     for (y0 = 0; y0 < height; y0 += 4) {
00663         for (x = 0; x < width; x++){
00664             if (y0 + 3 < height && !(
00665             (t1->flags[y0+1][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
00666             (t1->flags[y0+2][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
00667             (t1->flags[y0+3][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
00668             (t1->flags[y0+4][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)))){
00669                 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
00670                     continue;
00671                 runlen = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00672                 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00673                 dec = 1;
00674             } else{
00675                 runlen = 0;
00676                 dec = 0;
00677             }
00678 
00679             for (y = y0 + runlen; y < y0 + 4 && y < height; y++){
00680                 if (!dec){
00681                     if (!(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)))
00682                         dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1],
00683                                                                                              bandno, 0));
00684                 }
00685                 if (dec){
00686                     int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
00687                     t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ? -mask : mask;
00688                     ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0);
00689                 }
00690                 dec = 0;
00691                 t1->flags[y+1][x+1] &= ~J2K_T1_VIS;
00692             }
00693         }
00694     }
00695     if (seg_symbols) {
00696         int val;
00697         val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00698         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00699         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00700         val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
00701         if (val != 0xa) {
00702             av_log(s->avctx, AV_LOG_ERROR,"Segmentation symbol value incorrect\n");
00703         }
00704     }
00705 }
00706 
00707 static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Context *t1, J2kCblk *cblk,
00708                        int width, int height, int bandpos)
00709 {
00710     int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y, clnpass_cnt = 0;
00711     int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style;
00712     int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style;
00713 
00714     for (y = 0; y < height+2; y++)
00715         memset(t1->flags[y], 0, (width+2)*sizeof(int));
00716 
00717     for (y = 0; y < height; y++)
00718         memset(t1->data[y], 0, width*sizeof(int));
00719 
00720     cblk->data[cblk->length] = 0xff;
00721     cblk->data[cblk->length+1] = 0xff;
00722     ff_mqc_initdec(&t1->mqc, cblk->data);
00723 
00724     while(passno--){
00725         switch(pass_t){
00726             case 0: decode_sigpass(t1, width, height, bpno+1, bandpos,
00727                                   bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
00728                     break;
00729             case 1: decode_refpass(t1, width, height, bpno+1);
00730                     if (bpass_csty_symbol && clnpass_cnt >= 4)
00731                         ff_mqc_initdec(&t1->mqc, cblk->data);
00732                     break;
00733             case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
00734                                    codsty->cblk_style & J2K_CBLK_SEGSYM);
00735                     clnpass_cnt = clnpass_cnt + 1;
00736                     if (bpass_csty_symbol && clnpass_cnt >= 4)
00737                        ff_mqc_initdec(&t1->mqc, cblk->data);
00738                     break;
00739         }
00740 
00741         pass_t++;
00742         if (pass_t == 3){
00743             bpno--;
00744             pass_t = 0;
00745         }
00746     }
00747     return 0;
00748 }
00749 
00750 static void mct_decode(J2kDecoderContext *s, J2kTile *tile)
00751 {
00752     int i, *src[3], i0, i1, i2, csize = 1;
00753 
00754     for (i = 0; i < 3; i++)
00755         src[i] = tile->comp[i].data;
00756 
00757     for (i = 0; i < 2; i++)
00758         csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];
00759 
00760     if (tile->codsty[0].transform == FF_DWT97){
00761         for (i = 0; i < csize; i++){
00762             i0 = *src[0] + (*src[2] * 46802 >> 16);
00763             i1 = *src[0] - (*src[1] * 22553 + *src[2] * 46802 >> 16);
00764             i2 = *src[0] + (116130 * *src[1] >> 16);
00765             *src[0]++ = i0;
00766             *src[1]++ = i1;
00767             *src[2]++ = i2;
00768         }
00769     } else{
00770         for (i = 0; i < csize; i++){
00771             i1 = *src[0] - (*src[2] + *src[1] >> 2);
00772             i0 = i1 + *src[2];
00773             i2 = i1 + *src[1];
00774             *src[0]++ = i0;
00775             *src[1]++ = i1;
00776             *src[2]++ = i2;
00777         }
00778     }
00779 }
00780 
00781 static int decode_tile(J2kDecoderContext *s, J2kTile *tile)
00782 {
00783     int compno, reslevelno, bandno;
00784     int x, y, *src[4];
00785     uint8_t *line;
00786     J2kT1Context t1;
00787 
00788     for (compno = 0; compno < s->ncomponents; compno++){
00789         J2kComponent *comp = tile->comp + compno;
00790         J2kCodingStyle *codsty = tile->codsty + compno;
00791 
00792         for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
00793             J2kResLevel *rlevel = comp->reslevel + reslevelno;
00794             for (bandno = 0; bandno < rlevel->nbands; bandno++){
00795                 J2kBand *band = rlevel->band + bandno;
00796                 int cblkx, cblky, cblkno=0, xx0, x0, xx1, y0, yy0, yy1, bandpos;
00797 
00798                 bandpos = bandno + (reslevelno > 0);
00799 
00800                 yy0 = bandno == 0 ? 0 : comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0];
00801                 y0 = yy0;
00802                 yy1 = FFMIN(ff_j2k_ceildiv(band->coord[1][0] + 1, band->codeblock_height) * band->codeblock_height,
00803                             band->coord[1][1]) - band->coord[1][0] + yy0;
00804 
00805                 if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1])
00806                     continue;
00807 
00808                 for (cblky = 0; cblky < band->cblkny; cblky++){
00809                     if (reslevelno == 0 || bandno == 1)
00810                         xx0 = 0;
00811                     else
00812                         xx0 = comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0];
00813                     x0 = xx0;
00814                     xx1 = FFMIN(ff_j2k_ceildiv(band->coord[0][0] + 1, band->codeblock_width) * band->codeblock_width,
00815                                 band->coord[0][1]) - band->coord[0][0] + xx0;
00816 
00817                     for (cblkx = 0; cblkx < band->cblknx; cblkx++, cblkno++){
00818                         int y, x;
00819                         decode_cblk(s, codsty, &t1, band->cblk + cblkno, xx1 - xx0, yy1 - yy0, bandpos);
00820                         if (codsty->transform == FF_DWT53){
00821                             for (y = yy0; y < yy1; y+=s->cdy[compno]){
00822                                 int *ptr = t1.data[y-yy0];
00823                                 for (x = xx0; x < xx1; x+=s->cdx[compno]){
00824                                     comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = *ptr++ >> 1;
00825                                 }
00826                             }
00827                         } else{
00828                             for (y = yy0; y < yy1; y+=s->cdy[compno]){
00829                                 int *ptr = t1.data[y-yy0];
00830                                 for (x = xx0; x < xx1; x+=s->cdx[compno]){
00831                                     int tmp = ((int64_t)*ptr++) * ((int64_t)band->stepsize) >> 13, tmp2;
00832                                     tmp2 = FFABS(tmp>>1) + FFABS(tmp&1);
00833                                     comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = tmp < 0 ? -tmp2 : tmp2;
00834                                 }
00835                             }
00836                         }
00837                         xx0 = xx1;
00838                         xx1 = FFMIN(xx1 + band->codeblock_width, band->coord[0][1] - band->coord[0][0] + x0);
00839                     }
00840                     yy0 = yy1;
00841                     yy1 = FFMIN(yy1 + band->codeblock_height, band->coord[1][1] - band->coord[1][0] + y0);
00842                 }
00843             }
00844         }
00845         ff_j2k_dwt_decode(&comp->dwt, comp->data);
00846         src[compno] = comp->data;
00847     }
00848     if (tile->codsty[0].mct)
00849         mct_decode(s, tile);
00850 
00851     if (s->precision <= 8) {
00852         for (compno = 0; compno < s->ncomponents; compno++){
00853             y = tile->comp[compno].coord[1][0] - s->image_offset_y;
00854             line = s->picture.data[0] + y * s->picture.linesize[0];
00855             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]){
00856                 uint8_t *dst;
00857 
00858                 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
00859                 dst = line + x * s->ncomponents + compno;
00860 
00861                 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
00862                     *src[compno] += 1 << (s->cbps[compno]-1);
00863                     if (*src[compno] < 0)
00864                         *src[compno] = 0;
00865                     else if (*src[compno] >= (1 << s->cbps[compno]))
00866                         *src[compno] = (1 << s->cbps[compno]) - 1;
00867                     *dst = *src[compno]++;
00868                     dst += s->ncomponents;
00869                 }
00870                 line += s->picture.linesize[0];
00871             }
00872         }
00873     } else {
00874         for (compno = 0; compno < s->ncomponents; compno++) {
00875             y = tile->comp[compno].coord[1][0] - s->image_offset_y;
00876             line = s->picture.data[0] + y * s->picture.linesize[0];
00877             for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
00878                 uint16_t *dst;
00879 
00880                 x = tile->comp[compno].coord[0][0] - s->image_offset_x;
00881                 dst = (uint16_t *)(line + (x * s->ncomponents + compno) * 2);
00882                 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) {
00883                     int32_t val;
00884 
00885                     val = *src[compno]++ << (16 - s->cbps[compno]);
00886                     val += 1 << 15;
00887                     val = av_clip(val, 0, (1 << 16) - 1);
00888                     *dst = val;
00889                     dst += s->ncomponents;
00890                 }
00891                 line += s->picture.linesize[0];
00892             }
00893         }
00894     }
00895     return 0;
00896 }
00897 
00898 static void cleanup(J2kDecoderContext *s)
00899 {
00900     int tileno, compno;
00901     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){
00902         for (compno = 0; compno < s->ncomponents; compno++){
00903             J2kComponent *comp = s->tile[tileno].comp + compno;
00904             J2kCodingStyle *codsty = s->tile[tileno].codsty + compno;
00905 
00906             ff_j2k_cleanup(comp, codsty);
00907         }
00908         av_freep(&s->tile[tileno].comp);
00909     }
00910     av_freep(&s->tile);
00911 }
00912 
00913 static int decode_codestream(J2kDecoderContext *s)
00914 {
00915     J2kCodingStyle *codsty = s->codsty;
00916     J2kQuantStyle  *qntsty = s->qntsty;
00917     uint8_t *properties = s->properties;
00918 
00919     for (;;){
00920         int oldpos, marker, len, ret = 0;
00921 
00922         if (bytestream2_get_bytes_left(&s->g) < 2){
00923             av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
00924             break;
00925         }
00926 
00927         marker = bytestream2_get_be16u(&s->g);
00928         av_dlog(s->avctx, "marker 0x%.4X at pos 0x%x\n", marker, bytestream2_tell(&s->g) - 4);
00929         oldpos = bytestream2_tell(&s->g);
00930 
00931         if (marker == J2K_SOD){
00932             J2kTile *tile = s->tile + s->curtileno;
00933             if (ret = init_tile(s, s->curtileno)) {
00934                 av_log(s->avctx, AV_LOG_ERROR, "tile initialization failed\n");
00935                 return ret;
00936             }
00937             if (ret = decode_packets(s, tile)) {
00938                 av_log(s->avctx, AV_LOG_ERROR, "packets decoding failed\n");
00939                 return ret;
00940             }
00941             continue;
00942         }
00943         if (marker == J2K_EOC)
00944             break;
00945 
00946         if (bytestream2_get_bytes_left(&s->g) < 2)
00947             return AVERROR(EINVAL);
00948         len = bytestream2_get_be16u(&s->g);
00949         switch (marker){
00950         case J2K_SIZ:
00951             ret = get_siz(s);
00952             break;
00953         case J2K_COC:
00954             ret = get_coc(s, codsty, properties);
00955             break;
00956         case J2K_COD:
00957             ret = get_cod(s, codsty, properties);
00958             break;
00959         case J2K_QCC:
00960             ret = get_qcc(s, len, qntsty, properties);
00961             break;
00962         case J2K_QCD:
00963             ret = get_qcd(s, len, qntsty, properties);
00964             break;
00965         case J2K_SOT:
00966             if (!(ret = get_sot(s))){
00967                 codsty = s->tile[s->curtileno].codsty;
00968                 qntsty = s->tile[s->curtileno].qntsty;
00969                 properties = s->tile[s->curtileno].properties;
00970             }
00971             break;
00972         case J2K_COM:
00973             // the comment is ignored
00974             bytestream2_skip(&s->g, len - 2);
00975             break;
00976         default:
00977             av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%x\n", marker, bytestream2_tell(&s->g) - 4);
00978             bytestream2_skip(&s->g, len - 2);
00979             break;
00980         }
00981         if (bytestream2_tell(&s->g) - oldpos != len || ret){
00982             av_log(s->avctx, AV_LOG_ERROR, "error during processing marker segment %.4x\n", marker);
00983             return ret ? ret : -1;
00984         }
00985     }
00986     return 0;
00987 }
00988 
00989 static int jp2_find_codestream(J2kDecoderContext *s)
00990 {
00991     uint32_t atom_size, atom;
00992     int found_codestream = 0, search_range = 10;
00993 
00994     while(!found_codestream && search_range && bytestream2_get_bytes_left(&s->g) >= 8) {
00995         atom_size = bytestream2_get_be32u(&s->g);
00996         atom      = bytestream2_get_be32u(&s->g);
00997         if (atom == JP2_CODESTREAM) {
00998             found_codestream = 1;
00999         } else {
01000             if (bytestream2_get_bytes_left(&s->g) < atom_size - 8)
01001                 return 0;
01002             bytestream2_skipu(&s->g, atom_size - 8);
01003             search_range--;
01004         }
01005     }
01006 
01007     if (found_codestream)
01008         return 1;
01009     return 0;
01010 }
01011 
01012 static int decode_frame(AVCodecContext *avctx,
01013                         void *data, int *data_size,
01014                         AVPacket *avpkt)
01015 {
01016     J2kDecoderContext *s = avctx->priv_data;
01017     AVFrame *picture = data;
01018     int tileno, ret;
01019 
01020     s->avctx = avctx;
01021     bytestream2_init(&s->g, avpkt->data, avpkt->size);
01022     s->curtileno = -1;
01023 
01024     if (bytestream2_get_bytes_left(&s->g) < 2) {
01025         ret = AVERROR(EINVAL);
01026         goto err_out;
01027     }
01028 
01029     // check if the image is in jp2 format
01030     if (bytestream2_get_bytes_left(&s->g) >= 12 &&
01031        (bytestream2_get_be32u(&s->g) == 12) &&
01032        (bytestream2_get_be32u(&s->g) == JP2_SIG_TYPE) &&
01033        (bytestream2_get_be32u(&s->g) == JP2_SIG_VALUE)) {
01034         if(!jp2_find_codestream(s)) {
01035             av_log(avctx, AV_LOG_ERROR, "couldn't find jpeg2k codestream atom\n");
01036             ret = -1;
01037             goto err_out;
01038         }
01039     } else {
01040         bytestream2_seek(&s->g, 0, SEEK_SET);
01041     }
01042 
01043     if (bytestream2_get_be16u(&s->g) != J2K_SOC){
01044         av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
01045         ret = -1;
01046         goto err_out;
01047     }
01048     if (ret = decode_codestream(s))
01049         goto err_out;
01050 
01051     for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
01052         if (ret = decode_tile(s, s->tile + tileno))
01053             goto err_out;
01054 
01055     cleanup(s);
01056 
01057     *data_size = sizeof(AVPicture);
01058     *picture = s->picture;
01059 
01060     return bytestream2_tell(&s->g);
01061 
01062 err_out:
01063     cleanup(s);
01064     return ret;
01065 }
01066 
01067 static av_cold int j2kdec_init(AVCodecContext *avctx)
01068 {
01069     J2kDecoderContext *s = avctx->priv_data;
01070 
01071     avcodec_get_frame_defaults((AVFrame*)&s->picture);
01072     avctx->coded_frame = (AVFrame*)&s->picture;
01073 
01074     ff_j2k_init_tier1_luts();
01075 
01076     return 0;
01077 }
01078 
01079 static av_cold int decode_end(AVCodecContext *avctx)
01080 {
01081     J2kDecoderContext *s = avctx->priv_data;
01082 
01083     if (s->picture.data[0])
01084         avctx->release_buffer(avctx, &s->picture);
01085 
01086     return 0;
01087 }
01088 
01089 AVCodec ff_jpeg2000_decoder = {
01090     .name           = "j2k",
01091     .type           = AVMEDIA_TYPE_VIDEO,
01092     .id             = CODEC_ID_JPEG2000,
01093     .priv_data_size = sizeof(J2kDecoderContext),
01094     .init           = j2kdec_init,
01095     .close          = decode_end,
01096     .decode         = decode_frame,
01097     .capabilities   = CODEC_CAP_EXPERIMENTAL,
01098     .long_name      = NULL_IF_CONFIG_SMALL("JPEG 2000"),
01099 };