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 #include "avcodec.h" 00029 #include "bytestream.h" 00030 #include "j2k.h" 00031 #include "libavutil/common.h" 00032 00033 #define JP2_SIG_TYPE 0x6A502020 00034 #define JP2_SIG_VALUE 0x0D0A870A 00035 #define JP2_CODESTREAM 0x6A703263 00036 00037 #define HAD_COC 0x01 00038 #define HAD_QCC 0x02 00039 00040 typedef struct { 00041 J2kComponent *comp; 00042 uint8_t properties[4]; 00043 J2kCodingStyle codsty[4]; 00044 J2kQuantStyle qntsty[4]; 00045 } J2kTile; 00046 00047 typedef struct { 00048 AVCodecContext *avctx; 00049 AVFrame picture; 00050 00051 int width, height; 00052 int image_offset_x, image_offset_y; 00053 int tile_offset_x, tile_offset_y; 00054 uint8_t cbps[4]; 00055 uint8_t sgnd[4]; 00056 uint8_t properties[4]; 00057 int cdx[4], cdy[4]; 00058 int precision; 00059 int ncomponents; 00060 int tile_width, tile_height; 00061 int numXtiles, numYtiles; 00062 int maxtilelen; 00063 00064 J2kCodingStyle codsty[4]; 00065 J2kQuantStyle qntsty[4]; 00066 00067 const uint8_t *buf_start; 00068 const uint8_t *buf; 00069 const uint8_t *buf_end; 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 if (s->buf_end - s->buf < ((n - s->bit_index) >> 8)) 00081 return AVERROR(EINVAL); 00082 while (--n >= 0){ 00083 res <<= 1; 00084 if (s->bit_index == 0){ 00085 s->bit_index = 7 + (*s->buf != 0xff); 00086 s->buf++; 00087 } 00088 s->bit_index--; 00089 res |= (*s->buf >> s->bit_index) & 1; 00090 } 00091 return res; 00092 } 00093 00094 static void j2k_flush(J2kDecoderContext *s) 00095 { 00096 if (*s->buf == 0xff) 00097 s->buf++; 00098 s->bit_index = 8; 00099 s->buf++; 00100 } 00101 #if 0 00102 void printcomp(J2kComponent *comp) 00103 { 00104 int i; 00105 for (i = 0; i < comp->y1 - comp->y0; i++) 00106 ff_j2k_printv(comp->data + i * (comp->x1 - comp->x0), comp->x1 - comp->x0); 00107 } 00108 00109 static void nspaces(FILE *fd, int n) 00110 { 00111 while(n--) putc(' ', fd); 00112 } 00113 00114 static void dump(J2kDecoderContext *s, FILE *fd) 00115 { 00116 int tileno, compno, reslevelno, bandno, precno; 00117 fprintf(fd, "XSiz = %d, YSiz = %d, tile_width = %d, tile_height = %d\n" 00118 "numXtiles = %d, numYtiles = %d, ncomponents = %d\n" 00119 "tiles:\n", 00120 s->width, s->height, s->tile_width, s->tile_height, 00121 s->numXtiles, s->numYtiles, s->ncomponents); 00122 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){ 00123 J2kTile *tile = s->tile + tileno; 00124 nspaces(fd, 2); 00125 fprintf(fd, "tile %d:\n", tileno); 00126 for(compno = 0; compno < s->ncomponents; compno++){ 00127 J2kComponent *comp = tile->comp + compno; 00128 nspaces(fd, 4); 00129 fprintf(fd, "component %d:\n", compno); 00130 nspaces(fd, 4); 00131 fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d\n", 00132 comp->x0, comp->x1, comp->y0, comp->y1); 00133 for(reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){ 00134 J2kResLevel *reslevel = comp->reslevel + reslevelno; 00135 nspaces(fd, 6); 00136 fprintf(fd, "reslevel %d:\n", reslevelno); 00137 nspaces(fd, 6); 00138 fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d, nbands = %d\n", 00139 reslevel->x0, reslevel->x1, reslevel->y0, 00140 reslevel->y1, reslevel->nbands); 00141 for(bandno = 0; bandno < reslevel->nbands; bandno++){ 00142 J2kBand *band = reslevel->band + bandno; 00143 nspaces(fd, 8); 00144 fprintf(fd, "band %d:\n", bandno); 00145 nspaces(fd, 8); 00146 fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d," 00147 "codeblock_width = %d, codeblock_height = %d cblknx = %d cblkny = %d\n", 00148 band->x0, band->x1, 00149 band->y0, band->y1, 00150 band->codeblock_width, band->codeblock_height, 00151 band->cblknx, band->cblkny); 00152 for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){ 00153 J2kPrec *prec = band->prec + precno; 00154 nspaces(fd, 10); 00155 fprintf(fd, "prec %d:\n", precno); 00156 nspaces(fd, 10); 00157 fprintf(fd, "xi0 = %d, xi1 = %d, yi0 = %d, yi1 = %d\n", 00158 prec->xi0, prec->xi1, prec->yi0, prec->yi1); 00159 } 00160 } 00161 } 00162 } 00163 } 00164 } 00165 #endif 00166 00168 static int tag_tree_decode(J2kDecoderContext *s, J2kTgtNode *node, int threshold) 00169 { 00170 J2kTgtNode *stack[30]; 00171 int sp = -1, curval = 0; 00172 00173 while(node && !node->vis){ 00174 stack[++sp] = node; 00175 node = node->parent; 00176 } 00177 00178 if (node) 00179 curval = node->val; 00180 else 00181 curval = stack[sp]->val; 00182 00183 while(curval < threshold && sp >= 0){ 00184 if (curval < stack[sp]->val) 00185 curval = stack[sp]->val; 00186 while (curval < threshold){ 00187 int ret; 00188 if ((ret = get_bits(s, 1)) > 0){ 00189 stack[sp]->vis++; 00190 break; 00191 } else if (!ret) 00192 curval++; 00193 else 00194 return ret; 00195 } 00196 stack[sp]->val = curval; 00197 sp--; 00198 } 00199 return curval; 00200 } 00201 00202 /* marker segments */ 00204 static int get_siz(J2kDecoderContext *s) 00205 { 00206 int i, ret; 00207 00208 if (s->buf_end - s->buf < 36) 00209 return AVERROR(EINVAL); 00210 00211 bytestream_get_be16(&s->buf); // Rsiz (skipped) 00212 s->width = bytestream_get_be32(&s->buf); // width 00213 s->height = bytestream_get_be32(&s->buf); // height 00214 s->image_offset_x = bytestream_get_be32(&s->buf); // X0Siz 00215 s->image_offset_y = bytestream_get_be32(&s->buf); // Y0Siz 00216 00217 s->tile_width = bytestream_get_be32(&s->buf); // XTSiz 00218 s->tile_height = bytestream_get_be32(&s->buf); // YTSiz 00219 s->tile_offset_x = bytestream_get_be32(&s->buf); // XT0Siz 00220 s->tile_offset_y = bytestream_get_be32(&s->buf); // YT0Siz 00221 s->ncomponents = bytestream_get_be16(&s->buf); // CSiz 00222 00223 if(s->tile_width<=0 || s->tile_height<=0) 00224 return AVERROR(EINVAL); 00225 00226 if (s->buf_end - s->buf < 2 * s->ncomponents) 00227 return AVERROR(EINVAL); 00228 00229 for (i = 0; i < s->ncomponents; i++){ // Ssiz_i XRsiz_i, YRsiz_i 00230 uint8_t x = bytestream_get_byte(&s->buf); 00231 s->cbps[i] = (x & 0x7f) + 1; 00232 s->precision = FFMAX(s->cbps[i], s->precision); 00233 s->sgnd[i] = !!(x & 0x80); 00234 s->cdx[i] = bytestream_get_byte(&s->buf); 00235 s->cdy[i] = bytestream_get_byte(&s->buf); 00236 } 00237 00238 s->numXtiles = ff_j2k_ceildiv(s->width - s->tile_offset_x, s->tile_width); 00239 s->numYtiles = ff_j2k_ceildiv(s->height - s->tile_offset_y, s->tile_height); 00240 00241 if(s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(J2kTile)) 00242 return AVERROR(EINVAL); 00243 00244 s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(J2kTile)); 00245 if (!s->tile) 00246 return AVERROR(ENOMEM); 00247 00248 for (i = 0; i < s->numXtiles * s->numYtiles; i++){ 00249 J2kTile *tile = s->tile + i; 00250 00251 tile->comp = av_mallocz(s->ncomponents * sizeof(J2kComponent)); 00252 if (!tile->comp) 00253 return AVERROR(ENOMEM); 00254 } 00255 00256 s->avctx->width = s->width - s->image_offset_x; 00257 s->avctx->height = s->height - s->image_offset_y; 00258 00259 switch(s->ncomponents){ 00260 case 1: if (s->precision > 8) { 00261 s->avctx->pix_fmt = PIX_FMT_GRAY16; 00262 } else s->avctx->pix_fmt = PIX_FMT_GRAY8; 00263 break; 00264 case 3: if (s->precision > 8) { 00265 s->avctx->pix_fmt = PIX_FMT_RGB48; 00266 } else s->avctx->pix_fmt = PIX_FMT_RGB24; 00267 break; 00268 case 4: s->avctx->pix_fmt = PIX_FMT_BGRA; break; 00269 } 00270 00271 if (s->picture.data[0]) 00272 s->avctx->release_buffer(s->avctx, &s->picture); 00273 00274 if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0) 00275 return ret; 00276 00277 s->picture.pict_type = AV_PICTURE_TYPE_I; 00278 s->picture.key_frame = 1; 00279 00280 return 0; 00281 } 00282 00284 static int get_cox(J2kDecoderContext *s, J2kCodingStyle *c) 00285 { 00286 if (s->buf_end - s->buf < 5) 00287 return AVERROR(EINVAL); 00288 c->nreslevels = bytestream_get_byte(&s->buf) + 1; // num of resolution levels - 1 00289 c->log2_cblk_width = bytestream_get_byte(&s->buf) + 2; // cblk width 00290 c->log2_cblk_height = bytestream_get_byte(&s->buf) + 2; // cblk height 00291 00292 c->cblk_style = bytestream_get_byte(&s->buf); 00293 if (c->cblk_style != 0){ // cblk style 00294 av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style); 00295 } 00296 c->transform = bytestream_get_byte(&s->buf); // transformation 00297 if (c->csty & J2K_CSTY_PREC) { 00298 int i; 00299 for (i = 0; i < c->nreslevels; i++) 00300 bytestream_get_byte(&s->buf); 00301 } 00302 return 0; 00303 } 00304 00306 static int get_cod(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties) 00307 { 00308 J2kCodingStyle tmp; 00309 int compno; 00310 00311 if (s->buf_end - s->buf < 5) 00312 return AVERROR(EINVAL); 00313 00314 tmp.log2_prec_width = 00315 tmp.log2_prec_height = 15; 00316 00317 tmp.csty = bytestream_get_byte(&s->buf); 00318 00319 if (bytestream_get_byte(&s->buf)){ // progression level 00320 av_log(s->avctx, AV_LOG_ERROR, "only LRCP progression supported\n"); 00321 return -1; 00322 } 00323 00324 tmp.nlayers = bytestream_get_be16(&s->buf); 00325 tmp.mct = bytestream_get_byte(&s->buf); // multiple component transformation 00326 00327 get_cox(s, &tmp); 00328 for (compno = 0; compno < s->ncomponents; compno++){ 00329 if (!(properties[compno] & HAD_COC)) 00330 memcpy(c + compno, &tmp, sizeof(J2kCodingStyle)); 00331 } 00332 return 0; 00333 } 00334 00336 static int get_coc(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties) 00337 { 00338 int compno; 00339 00340 if (s->buf_end - s->buf < 2) 00341 return AVERROR(EINVAL); 00342 00343 compno = bytestream_get_byte(&s->buf); 00344 00345 c += compno; 00346 c->csty = bytestream_get_byte(&s->buf); 00347 get_cox(s, c); 00348 00349 properties[compno] |= HAD_COC; 00350 return 0; 00351 } 00352 00354 static int get_qcx(J2kDecoderContext *s, int n, J2kQuantStyle *q) 00355 { 00356 int i, x; 00357 00358 if (s->buf_end - s->buf < 1) 00359 return AVERROR(EINVAL); 00360 00361 x = bytestream_get_byte(&s->buf); // Sqcd 00362 00363 q->nguardbits = x >> 5; 00364 q->quantsty = x & 0x1f; 00365 00366 if (q->quantsty == J2K_QSTY_NONE){ 00367 n -= 3; 00368 if (s->buf_end - s->buf < n || 32*3 < n) 00369 return AVERROR(EINVAL); 00370 for (i = 0; i < n; i++) 00371 q->expn[i] = bytestream_get_byte(&s->buf) >> 3; 00372 } else if (q->quantsty == J2K_QSTY_SI){ 00373 if (s->buf_end - s->buf < 2) 00374 return AVERROR(EINVAL); 00375 x = bytestream_get_be16(&s->buf); 00376 q->expn[0] = x >> 11; 00377 q->mant[0] = x & 0x7ff; 00378 for (i = 1; i < 32 * 3; i++){ 00379 int curexpn = FFMAX(0, q->expn[0] - (i-1)/3); 00380 q->expn[i] = curexpn; 00381 q->mant[i] = q->mant[0]; 00382 } 00383 } else{ 00384 n = (n - 3) >> 1; 00385 if (s->buf_end - s->buf < n || 32*3 < n) 00386 return AVERROR(EINVAL); 00387 for (i = 0; i < n; i++){ 00388 x = bytestream_get_be16(&s->buf); 00389 q->expn[i] = x >> 11; 00390 q->mant[i] = x & 0x7ff; 00391 } 00392 } 00393 return 0; 00394 } 00395 00397 static int get_qcd(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties) 00398 { 00399 J2kQuantStyle tmp; 00400 int compno; 00401 00402 if (get_qcx(s, n, &tmp)) 00403 return -1; 00404 for (compno = 0; compno < s->ncomponents; compno++) 00405 if (!(properties[compno] & HAD_QCC)) 00406 memcpy(q + compno, &tmp, sizeof(J2kQuantStyle)); 00407 return 0; 00408 } 00409 00411 static int get_qcc(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties) 00412 { 00413 int compno; 00414 00415 if (s->buf_end - s->buf < 1) 00416 return AVERROR(EINVAL); 00417 00418 compno = bytestream_get_byte(&s->buf); 00419 properties[compno] |= HAD_QCC; 00420 return get_qcx(s, n-1, q+compno); 00421 } 00422 00424 static uint8_t get_sot(J2kDecoderContext *s) 00425 { 00426 if (s->buf_end - s->buf < 4) 00427 return AVERROR(EINVAL); 00428 00429 s->curtileno = bytestream_get_be16(&s->buf); 00430 if((unsigned)s->curtileno >= s->numXtiles * s->numYtiles){ 00431 s->curtileno=0; 00432 return AVERROR(EINVAL); 00433 } 00434 00435 s->buf += 4; 00436 00437 if (!bytestream_get_byte(&s->buf)){ 00438 J2kTile *tile = s->tile + s->curtileno; 00439 00440 /* copy defaults */ 00441 memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(J2kCodingStyle)); 00442 memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(J2kQuantStyle)); 00443 } 00444 bytestream_get_byte(&s->buf); 00445 00446 return 0; 00447 } 00448 00449 static int init_tile(J2kDecoderContext *s, int tileno) 00450 { 00451 int compno, 00452 tilex = tileno % s->numXtiles, 00453 tiley = tileno / s->numXtiles; 00454 J2kTile *tile = s->tile + tileno; 00455 00456 if (!tile->comp) 00457 return AVERROR(ENOMEM); 00458 for (compno = 0; compno < s->ncomponents; compno++){ 00459 J2kComponent *comp = tile->comp + compno; 00460 J2kCodingStyle *codsty = tile->codsty + compno; 00461 J2kQuantStyle *qntsty = tile->qntsty + compno; 00462 int ret; // global bandno 00463 00464 comp->coord[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x); 00465 comp->coord[0][1] = FFMIN((tilex+1)*s->tile_width + s->tile_offset_x, s->width); 00466 comp->coord[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y); 00467 comp->coord[1][1] = FFMIN((tiley+1)*s->tile_height + s->tile_offset_y, s->height); 00468 00469 if (ret = ff_j2k_init_component(comp, codsty, qntsty, s->cbps[compno], s->cdx[compno], s->cdy[compno])) 00470 return ret; 00471 } 00472 return 0; 00473 } 00474 00476 static int getnpasses(J2kDecoderContext *s) 00477 { 00478 int num; 00479 if (!get_bits(s, 1)) 00480 return 1; 00481 if (!get_bits(s, 1)) 00482 return 2; 00483 if ((num = get_bits(s, 2)) != 3) 00484 return num < 0 ? num : 3 + num; 00485 if ((num = get_bits(s, 5)) != 31) 00486 return num < 0 ? num : 6 + num; 00487 num = get_bits(s, 7); 00488 return num < 0 ? num : 37 + num; 00489 } 00490 00491 static int getlblockinc(J2kDecoderContext *s) 00492 { 00493 int res = 0, ret; 00494 while (ret = get_bits(s, 1)){ 00495 if (ret < 0) 00496 return ret; 00497 res++; 00498 } 00499 return res; 00500 } 00501 00502 static int decode_packet(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kResLevel *rlevel, int precno, 00503 int layno, uint8_t *expn, int numgbits) 00504 { 00505 int bandno, cblkny, cblknx, cblkno, ret; 00506 00507 if (!(ret = get_bits(s, 1))){ 00508 j2k_flush(s); 00509 return 0; 00510 } else if (ret < 0) 00511 return ret; 00512 00513 for (bandno = 0; bandno < rlevel->nbands; bandno++){ 00514 J2kBand *band = rlevel->band + bandno; 00515 J2kPrec *prec = band->prec + precno; 00516 int pos = 0; 00517 00518 if (band->coord[0][0] == band->coord[0][1] 00519 || band->coord[1][0] == band->coord[1][1]) 00520 continue; 00521 00522 for (cblkny = prec->yi0; cblkny < prec->yi1; cblkny++) 00523 for(cblknx = prec->xi0, cblkno = cblkny * band->cblknx + cblknx; cblknx < prec->xi1; cblknx++, cblkno++, pos++){ 00524 J2kCblk *cblk = band->cblk + cblkno; 00525 int incl, newpasses, llen; 00526 00527 if (cblk->npasses) 00528 incl = get_bits(s, 1); 00529 else 00530 incl = tag_tree_decode(s, prec->cblkincl + pos, layno+1) == layno; 00531 if (!incl) 00532 continue; 00533 else if (incl < 0) 00534 return incl; 00535 00536 if (!cblk->npasses) 00537 cblk->nonzerobits = expn[bandno] + numgbits - 1 - tag_tree_decode(s, prec->zerobits + pos, 100); 00538 if ((newpasses = getnpasses(s)) < 0) 00539 return newpasses; 00540 if ((llen = getlblockinc(s)) < 0) 00541 return llen; 00542 cblk->lblock += llen; 00543 if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0) 00544 return ret; 00545 cblk->lengthinc = ret; 00546 cblk->npasses += newpasses; 00547 } 00548 } 00549 j2k_flush(s); 00550 00551 if (codsty->csty & J2K_CSTY_EPH) { 00552 if (AV_RB16(s->buf) == J2K_EPH) { 00553 s->buf += 2; 00554 } else { 00555 av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n"); 00556 } 00557 } 00558 00559 for (bandno = 0; bandno < rlevel->nbands; bandno++){ 00560 J2kBand *band = rlevel->band + bandno; 00561 int yi, cblknw = band->prec[precno].xi1 - band->prec[precno].xi0; 00562 for (yi = band->prec[precno].yi0; yi < band->prec[precno].yi1; yi++){ 00563 int xi; 00564 for (xi = band->prec[precno].xi0; xi < band->prec[precno].xi1; xi++){ 00565 J2kCblk *cblk = band->cblk + yi * cblknw + xi; 00566 if (s->buf_end - s->buf < cblk->lengthinc) 00567 return AVERROR(EINVAL); 00568 bytestream_get_buffer(&s->buf, cblk->data, cblk->lengthinc); 00569 cblk->length += cblk->lengthinc; 00570 cblk->lengthinc = 0; 00571 } 00572 } 00573 } 00574 return 0; 00575 } 00576 00577 static int decode_packets(J2kDecoderContext *s, J2kTile *tile) 00578 { 00579 int layno, reslevelno, compno, precno, ok_reslevel; 00580 s->bit_index = 8; 00581 for (layno = 0; layno < tile->codsty[0].nlayers; layno++){ 00582 ok_reslevel = 1; 00583 for (reslevelno = 0; ok_reslevel; reslevelno++){ 00584 ok_reslevel = 0; 00585 for (compno = 0; compno < s->ncomponents; compno++){ 00586 J2kCodingStyle *codsty = tile->codsty + compno; 00587 J2kQuantStyle *qntsty = tile->qntsty + compno; 00588 if (reslevelno < codsty->nreslevels){ 00589 J2kResLevel *rlevel = tile->comp[compno].reslevel + reslevelno; 00590 ok_reslevel = 1; 00591 for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){ 00592 if (decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn + 00593 (reslevelno ? 3*(reslevelno-1)+1 : 0), qntsty->nguardbits)) 00594 return -1; 00595 } 00596 } 00597 } 00598 } 00599 } 00600 return 0; 00601 } 00602 00603 /* TIER-1 routines */ 00604 static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol, 00605 int vert_causal_ctx_csty_symbol) 00606 { 00607 int mask = 3 << (bpno - 1), y0, x, y; 00608 00609 for (y0 = 0; y0 < height; y0 += 4) 00610 for (x = 0; x < width; x++) 00611 for (y = y0; y < height && y < y0+4; y++){ 00612 if ((t1->flags[y+1][x+1] & J2K_T1_SIG_NB) 00613 && !(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))){ 00614 int vert_causal_ctx_csty_loc_symbol = vert_causal_ctx_csty_symbol && (x == 3 && y == 3); 00615 if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno, 00616 vert_causal_ctx_csty_loc_symbol))){ 00617 int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit); 00618 if (bpass_csty_symbol) 00619 t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask; 00620 else 00621 t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ? 00622 -mask : mask; 00623 00624 ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0); 00625 } 00626 t1->flags[y+1][x+1] |= J2K_T1_VIS; 00627 } 00628 } 00629 } 00630 00631 static void decode_refpass(J2kT1Context *t1, int width, int height, int bpno) 00632 { 00633 int phalf, nhalf; 00634 int y0, x, y; 00635 00636 phalf = 1 << (bpno - 1); 00637 nhalf = -phalf; 00638 00639 for (y0 = 0; y0 < height; y0 += 4) 00640 for (x = 0; x < width; x++) 00641 for (y = y0; y < height && y < y0+4; y++){ 00642 if ((t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)) == J2K_T1_SIG){ 00643 int ctxno = ff_j2k_getrefctxno(t1->flags[y+1][x+1]); 00644 int r = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? phalf : nhalf; 00645 t1->data[y][x] += t1->data[y][x] < 0 ? -r : r; 00646 t1->flags[y+1][x+1] |= J2K_T1_REF; 00647 } 00648 } 00649 } 00650 00651 static void decode_clnpass(J2kDecoderContext *s, J2kT1Context *t1, int width, int height, 00652 int bpno, int bandno, int seg_symbols) 00653 { 00654 int mask = 3 << (bpno - 1), y0, x, y, runlen, dec; 00655 00656 for (y0 = 0; y0 < height; y0 += 4) { 00657 for (x = 0; x < width; x++){ 00658 if (y0 + 3 < height && !( 00659 (t1->flags[y0+1][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) || 00660 (t1->flags[y0+2][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) || 00661 (t1->flags[y0+3][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) || 00662 (t1->flags[y0+4][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)))){ 00663 if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL)) 00664 continue; 00665 runlen = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00666 runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00667 dec = 1; 00668 } else{ 00669 runlen = 0; 00670 dec = 0; 00671 } 00672 00673 for (y = y0 + runlen; y < y0 + 4 && y < height; y++){ 00674 if (!dec){ 00675 if (!(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))) 00676 dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], 00677 bandno, 0)); 00678 } 00679 if (dec){ 00680 int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit); 00681 t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ? -mask : mask; 00682 ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0); 00683 } 00684 dec = 0; 00685 t1->flags[y+1][x+1] &= ~J2K_T1_VIS; 00686 } 00687 } 00688 } 00689 if (seg_symbols) { 00690 int val; 00691 val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00692 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00693 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00694 val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI); 00695 if (val != 0xa) { 00696 av_log(s->avctx, AV_LOG_ERROR,"Segmentation symbol value incorrect\n"); 00697 } 00698 } 00699 } 00700 00701 static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Context *t1, J2kCblk *cblk, 00702 int width, int height, int bandpos) 00703 { 00704 int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y, clnpass_cnt = 0; 00705 int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style; 00706 int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style; 00707 00708 for (y = 0; y < height+2; y++) 00709 memset(t1->flags[y], 0, (width+2)*sizeof(int)); 00710 00711 for (y = 0; y < height; y++) 00712 memset(t1->data[y], 0, width*sizeof(int)); 00713 00714 cblk->data[cblk->length] = 0xff; 00715 cblk->data[cblk->length+1] = 0xff; 00716 ff_mqc_initdec(&t1->mqc, cblk->data); 00717 00718 while(passno--){ 00719 switch(pass_t){ 00720 case 0: decode_sigpass(t1, width, height, bpno+1, bandpos, 00721 bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol); 00722 break; 00723 case 1: decode_refpass(t1, width, height, bpno+1); 00724 if (bpass_csty_symbol && clnpass_cnt >= 4) 00725 ff_mqc_initdec(&t1->mqc, cblk->data); 00726 break; 00727 case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos, 00728 codsty->cblk_style & J2K_CBLK_SEGSYM); 00729 clnpass_cnt = clnpass_cnt + 1; 00730 if (bpass_csty_symbol && clnpass_cnt >= 4) 00731 ff_mqc_initdec(&t1->mqc, cblk->data); 00732 break; 00733 } 00734 00735 pass_t++; 00736 if (pass_t == 3){ 00737 bpno--; 00738 pass_t = 0; 00739 } 00740 } 00741 return 0; 00742 } 00743 00744 static void mct_decode(J2kDecoderContext *s, J2kTile *tile) 00745 { 00746 int i, *src[3], i0, i1, i2, csize = 1; 00747 00748 for (i = 0; i < 3; i++) 00749 src[i] = tile->comp[i].data; 00750 00751 for (i = 0; i < 2; i++) 00752 csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0]; 00753 00754 if (tile->codsty[0].transform == FF_DWT97){ 00755 for (i = 0; i < csize; i++){ 00756 i0 = *src[0] + (*src[2] * 46802 >> 16); 00757 i1 = *src[0] - (*src[1] * 22553 + *src[2] * 46802 >> 16); 00758 i2 = *src[0] + (116130 * *src[1] >> 16); 00759 *src[0]++ = i0; 00760 *src[1]++ = i1; 00761 *src[2]++ = i2; 00762 } 00763 } else{ 00764 for (i = 0; i < csize; i++){ 00765 i1 = *src[0] - (*src[2] + *src[1] >> 2); 00766 i0 = i1 + *src[2]; 00767 i2 = i1 + *src[1]; 00768 *src[0]++ = i0; 00769 *src[1]++ = i1; 00770 *src[2]++ = i2; 00771 } 00772 } 00773 } 00774 00775 static int decode_tile(J2kDecoderContext *s, J2kTile *tile) 00776 { 00777 int compno, reslevelno, bandno; 00778 int x, y, *src[4]; 00779 uint8_t *line; 00780 J2kT1Context t1; 00781 00782 for (compno = 0; compno < s->ncomponents; compno++){ 00783 J2kComponent *comp = tile->comp + compno; 00784 J2kCodingStyle *codsty = tile->codsty + compno; 00785 00786 for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){ 00787 J2kResLevel *rlevel = comp->reslevel + reslevelno; 00788 for (bandno = 0; bandno < rlevel->nbands; bandno++){ 00789 J2kBand *band = rlevel->band + bandno; 00790 int cblkx, cblky, cblkno=0, xx0, x0, xx1, y0, yy0, yy1, bandpos; 00791 00792 bandpos = bandno + (reslevelno > 0); 00793 00794 yy0 = bandno == 0 ? 0 : comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0]; 00795 y0 = yy0; 00796 yy1 = FFMIN(ff_j2k_ceildiv(band->coord[1][0] + 1, band->codeblock_height) * band->codeblock_height, 00797 band->coord[1][1]) - band->coord[1][0] + yy0; 00798 00799 if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1]) 00800 continue; 00801 00802 for (cblky = 0; cblky < band->cblkny; cblky++){ 00803 if (reslevelno == 0 || bandno == 1) 00804 xx0 = 0; 00805 else 00806 xx0 = comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0]; 00807 x0 = xx0; 00808 xx1 = FFMIN(ff_j2k_ceildiv(band->coord[0][0] + 1, band->codeblock_width) * band->codeblock_width, 00809 band->coord[0][1]) - band->coord[0][0] + xx0; 00810 00811 for (cblkx = 0; cblkx < band->cblknx; cblkx++, cblkno++){ 00812 int y, x; 00813 decode_cblk(s, codsty, &t1, band->cblk + cblkno, xx1 - xx0, yy1 - yy0, bandpos); 00814 if (codsty->transform == FF_DWT53){ 00815 for (y = yy0; y < yy1; y+=s->cdy[compno]){ 00816 int *ptr = t1.data[y-yy0]; 00817 for (x = xx0; x < xx1; x+=s->cdx[compno]){ 00818 comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = *ptr++ >> 1; 00819 } 00820 } 00821 } else{ 00822 for (y = yy0; y < yy1; y+=s->cdy[compno]){ 00823 int *ptr = t1.data[y-yy0]; 00824 for (x = xx0; x < xx1; x+=s->cdx[compno]){ 00825 int tmp = ((int64_t)*ptr++) * ((int64_t)band->stepsize) >> 13, tmp2; 00826 tmp2 = FFABS(tmp>>1) + FFABS(tmp&1); 00827 comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = tmp < 0 ? -tmp2 : tmp2; 00828 } 00829 } 00830 } 00831 xx0 = xx1; 00832 xx1 = FFMIN(xx1 + band->codeblock_width, band->coord[0][1] - band->coord[0][0] + x0); 00833 } 00834 yy0 = yy1; 00835 yy1 = FFMIN(yy1 + band->codeblock_height, band->coord[1][1] - band->coord[1][0] + y0); 00836 } 00837 } 00838 } 00839 ff_j2k_dwt_decode(&comp->dwt, comp->data); 00840 src[compno] = comp->data; 00841 } 00842 if (tile->codsty[0].mct) 00843 mct_decode(s, tile); 00844 00845 if (s->avctx->pix_fmt == PIX_FMT_BGRA) // RGBA -> BGRA 00846 FFSWAP(int *, src[0], src[2]); 00847 00848 if (s->precision <= 8) { 00849 for (compno = 0; compno < s->ncomponents; compno++){ 00850 y = tile->comp[compno].coord[1][0] - s->image_offset_y; 00851 line = s->picture.data[0] + y * s->picture.linesize[0]; 00852 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]){ 00853 uint8_t *dst; 00854 00855 x = tile->comp[compno].coord[0][0] - s->image_offset_x; 00856 dst = line + x * s->ncomponents + compno; 00857 00858 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) { 00859 *src[compno] += 1 << (s->cbps[compno]-1); 00860 if (*src[compno] < 0) 00861 *src[compno] = 0; 00862 else if (*src[compno] >= (1 << s->cbps[compno])) 00863 *src[compno] = (1 << s->cbps[compno]) - 1; 00864 *dst = *src[compno]++; 00865 dst += s->ncomponents; 00866 } 00867 line += s->picture.linesize[0]; 00868 } 00869 } 00870 } else { 00871 for (compno = 0; compno < s->ncomponents; compno++) { 00872 y = tile->comp[compno].coord[1][0] - s->image_offset_y; 00873 line = s->picture.data[0] + y * s->picture.linesize[0]; 00874 for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) { 00875 uint16_t *dst; 00876 x = tile->comp[compno].coord[0][0] - s->image_offset_x; 00877 dst = line + (x * s->ncomponents + compno) * 2; 00878 for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) { 00879 int32_t val; 00880 val = *src[compno]++ << (16 - s->cbps[compno]); 00881 val += 1 << 15; 00882 val = av_clip(val, 0, (1 << 16) - 1); 00883 *dst = val; 00884 dst += s->ncomponents; 00885 } 00886 line += s->picture.linesize[0]; 00887 } 00888 } 00889 } 00890 return 0; 00891 } 00892 00893 static void cleanup(J2kDecoderContext *s) 00894 { 00895 int tileno, compno; 00896 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){ 00897 for (compno = 0; compno < s->ncomponents; compno++){ 00898 J2kComponent *comp = s->tile[tileno].comp + compno; 00899 J2kCodingStyle *codsty = s->tile[tileno].codsty + compno; 00900 00901 ff_j2k_cleanup(comp, codsty); 00902 } 00903 av_freep(&s->tile[tileno].comp); 00904 } 00905 av_freep(&s->tile); 00906 } 00907 00908 static int decode_codestream(J2kDecoderContext *s) 00909 { 00910 J2kCodingStyle *codsty = s->codsty; 00911 J2kQuantStyle *qntsty = s->qntsty; 00912 uint8_t *properties = s->properties; 00913 00914 for (;;){ 00915 int marker, len, ret = 0; 00916 const uint8_t *oldbuf; 00917 if (s->buf_end - s->buf < 2){ 00918 av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n"); 00919 break; 00920 } 00921 00922 marker = bytestream_get_be16(&s->buf); 00923 if(s->avctx->debug & FF_DEBUG_STARTCODE) 00924 av_log(s->avctx, AV_LOG_DEBUG, "marker 0x%.4X at pos 0x%tx\n", marker, s->buf - s->buf_start - 4); 00925 oldbuf = s->buf; 00926 00927 if (marker == J2K_SOD){ 00928 J2kTile *tile = s->tile + s->curtileno; 00929 if (ret = init_tile(s, s->curtileno)) 00930 return ret; 00931 if (ret = decode_packets(s, tile)) 00932 return ret; 00933 continue; 00934 } 00935 if (marker == J2K_EOC) 00936 break; 00937 00938 if (s->buf_end - s->buf < 2) 00939 return AVERROR(EINVAL); 00940 len = bytestream_get_be16(&s->buf); 00941 switch(marker){ 00942 case J2K_SIZ: 00943 ret = get_siz(s); break; 00944 case J2K_COC: 00945 ret = get_coc(s, codsty, properties); break; 00946 case J2K_COD: 00947 ret = get_cod(s, codsty, properties); break; 00948 case J2K_QCC: 00949 ret = get_qcc(s, len, qntsty, properties); break; 00950 case J2K_QCD: 00951 ret = get_qcd(s, len, qntsty, properties); break; 00952 case J2K_SOT: 00953 if (!(ret = get_sot(s))){ 00954 codsty = s->tile[s->curtileno].codsty; 00955 qntsty = s->tile[s->curtileno].qntsty; 00956 properties = s->tile[s->curtileno].properties; 00957 } 00958 break; 00959 case J2K_COM: 00960 // the comment is ignored 00961 s->buf += len - 2; break; 00962 default: 00963 av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%tx\n", marker, s->buf - s->buf_start - 4); 00964 s->buf += len - 2; break; 00965 } 00966 if (s->buf - oldbuf != len || ret){ 00967 av_log(s->avctx, AV_LOG_ERROR, "error during processing marker segment %.4x\n", marker); 00968 return ret ? ret : -1; 00969 } 00970 } 00971 return 0; 00972 } 00973 00974 static int jp2_find_codestream(J2kDecoderContext *s) 00975 { 00976 uint32_t atom_size; 00977 int found_codestream = 0, search_range = 10; 00978 00979 // skip jpeg2k signature atom 00980 s->buf += 12; 00981 00982 while(!found_codestream && search_range && s->buf_end - s->buf >= 8) { 00983 atom_size = AV_RB32(s->buf); 00984 if(AV_RB32(s->buf + 4) == JP2_CODESTREAM) { 00985 found_codestream = 1; 00986 s->buf += 8; 00987 } else { 00988 if (s->buf_end - s->buf < atom_size) 00989 return 0; 00990 s->buf += atom_size; 00991 search_range--; 00992 } 00993 } 00994 00995 if(found_codestream) 00996 return 1; 00997 return 0; 00998 } 00999 01000 static int decode_frame(AVCodecContext *avctx, 01001 void *data, int *data_size, 01002 AVPacket *avpkt) 01003 { 01004 J2kDecoderContext *s = avctx->priv_data; 01005 AVFrame *picture = data; 01006 int tileno, ret; 01007 01008 s->avctx = avctx; 01009 av_log(s->avctx, AV_LOG_DEBUG, "start\n"); 01010 01011 // init 01012 s->buf = s->buf_start = avpkt->data; 01013 s->buf_end = s->buf_start + avpkt->size; 01014 s->curtileno = -1; 01015 01016 ff_j2k_init_tier1_luts(); 01017 01018 if (s->buf_end - s->buf < 2) { 01019 ret = AVERROR(EINVAL); 01020 goto err_out; 01021 } 01022 01023 // check if the image is in jp2 format 01024 if(s->buf_end - s->buf >= 12 && 01025 (AV_RB32(s->buf) == 12) && (AV_RB32(s->buf + 4) == JP2_SIG_TYPE) && 01026 (AV_RB32(s->buf + 8) == JP2_SIG_VALUE)) { 01027 if(!jp2_find_codestream(s)) { 01028 av_log(avctx, AV_LOG_ERROR, "couldn't find jpeg2k codestream atom\n"); 01029 ret = -1; 01030 goto err_out; 01031 } 01032 } 01033 01034 if (bytestream_get_be16(&s->buf) != J2K_SOC){ 01035 av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n"); 01036 ret = -1; 01037 goto err_out; 01038 } 01039 if (ret = decode_codestream(s)) 01040 goto err_out; 01041 01042 for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) 01043 if (ret = decode_tile(s, s->tile + tileno)) 01044 goto err_out; 01045 01046 cleanup(s); 01047 av_log(s->avctx, AV_LOG_DEBUG, "end\n"); 01048 01049 *data_size = sizeof(AVPicture); 01050 *picture = s->picture; 01051 01052 return s->buf - s->buf_start; 01053 01054 err_out: 01055 cleanup(s); 01056 return ret; 01057 } 01058 01059 static av_cold int j2kdec_init(AVCodecContext *avctx) 01060 { 01061 J2kDecoderContext *s = avctx->priv_data; 01062 01063 avcodec_get_frame_defaults((AVFrame*)&s->picture); 01064 avctx->coded_frame = (AVFrame*)&s->picture; 01065 return 0; 01066 } 01067 01068 static av_cold int decode_end(AVCodecContext *avctx) 01069 { 01070 J2kDecoderContext *s = avctx->priv_data; 01071 01072 if (s->picture.data[0]) 01073 avctx->release_buffer(avctx, &s->picture); 01074 01075 return 0; 01076 } 01077 01078 AVCodec ff_jpeg2000_decoder = { 01079 .name = "j2k", 01080 .type = AVMEDIA_TYPE_VIDEO, 01081 .id = CODEC_ID_JPEG2000, 01082 .priv_data_size = sizeof(J2kDecoderContext), 01083 .init = j2kdec_init, 01084 .close = decode_end, 01085 .decode = decode_frame, 01086 .capabilities = CODEC_CAP_EXPERIMENTAL, 01087 .long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"), 01088 .pix_fmts = 01089 (const enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_RGB24, PIX_FMT_NONE} 01090 };