static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, Jpeg2000ResLevel *rlevel, int precno, int layno, uint8_t *expn, int numgbits) { int bandno, cblkno, ret, nb_code_blocks; if (!(ret = get_bits(s, 1))) { jpeg2000_flush(s); return 0; } else if (ret < 0) return ret; for (bandno = 0; bandno < rlevel->nbands; bandno++) { Jpeg2000Band *band = rlevel->band + bandno; Jpeg2000Prec *prec = band->prec + precno; if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1]) continue; nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width; for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) { Jpeg2000Cblk *cblk = prec->cblk + cblkno; int incl, newpasses, llen; if (cblk->npasses) incl = get_bits(s, 1); else incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno; if (!incl) continue; else if (incl < 0) return incl; if (!cblk->npasses) cblk->nonzerobits = expn[bandno] + numgbits - 1 - tag_tree_decode(s, prec->zerobits + cblkno, 100); if ((newpasses = getnpasses(s)) < 0) return newpasses; if ((llen = getlblockinc(s)) < 0) return llen; cblk->lblock += llen; if ((ret = get_bits(s, av_log2(newpasses) + cblk->lblock)) < 0) return ret; cblk->lengthinc = ret; cblk->npasses += newpasses; } } jpeg2000_flush(s); if (codsty->csty & JPEG2000_CSTY_EPH) { if (bytestream2_peek_be16(&s->g) == JPEG2000_EPH) bytestream2_skip(&s->g, 2); else av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n"); } for (bandno = 0; bandno < rlevel->nbands; bandno++) { Jpeg2000Band *band = rlevel->band + bandno; Jpeg2000Prec *prec = band->prec + precno; nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width; for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) { Jpeg2000Cblk *cblk = prec->cblk + cblkno; if ( bytestream2_get_bytes_left(&s->g) < cblk->lengthinc || sizeof(cblk->data) < cblk->lengthinc ) return AVERROR(EINVAL); /* Code-block data can be empty. In that case initialize data * with 0xFFFF. */ if (cblk->lengthinc > 0) { bytestream2_get_bufferu(&s->g, cblk->data, cblk->lengthinc); } else { cblk->data[0] = 0xFF; cblk->data[1] = 0xFF; } cblk->length += cblk->lengthinc; cblk->lengthinc = 0; } } return 0; }