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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
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);
00212 s->width = bytestream_get_be32(&s->buf);
00213 s->height = bytestream_get_be32(&s->buf);
00214 s->image_offset_x = bytestream_get_be32(&s->buf);
00215 s->image_offset_y = bytestream_get_be32(&s->buf);
00216
00217 s->tile_width = bytestream_get_be32(&s->buf);
00218 s->tile_height = bytestream_get_be32(&s->buf);
00219 s->tile_offset_x = bytestream_get_be32(&s->buf);
00220 s->tile_offset_y = bytestream_get_be32(&s->buf);
00221 s->ncomponents = bytestream_get_be16(&s->buf);
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++){
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;
00289 c->log2_cblk_width = bytestream_get_byte(&s->buf) + 2;
00290 c->log2_cblk_height = bytestream_get_byte(&s->buf) + 2;
00291
00292 c->cblk_style = bytestream_get_byte(&s->buf);
00293 if (c->cblk_style != 0){
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);
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)){
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);
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);
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
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;
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
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)
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
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
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
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
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 };
