int ff_j2k_init_component(Jpeg2000Component *comp, Jpeg2000CodingStyle *codsty, Jpeg2000QuantStyle *qntsty, int cbps, int dx, int dy)

{

    int reslevelno, bandno, gbandno = 0, ret, i, j, csize = 1;



    if (ret=ff_j2k_dwt_init(&comp->dwt, comp->coord, codsty->nreslevels-1, codsty->transform))

        return ret;

    for (i = 0; i < 2; i++)

        csize *= comp->coord[i][1] - comp->coord[i][0];



    comp->data = av_malloc(csize * sizeof(int));

    if (!comp->data)

        return AVERROR(ENOMEM);

    comp->reslevel = av_malloc(codsty->nreslevels * sizeof(Jpeg2000ResLevel));



    if (!comp->reslevel)

        return AVERROR(ENOMEM);

    for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) {

        int declvl = codsty->nreslevels - reslevelno;

        Jpeg2000ResLevel *reslevel = comp->reslevel + reslevelno;



        for (i = 0; i < 2; i++)

            for (j = 0; j < 2; j++)

                reslevel->coord[i][j] =

                    ff_jpeg2000_ceildivpow2(comp->coord[i][j], declvl - 1);



        if (reslevelno == 0)

            reslevel->nbands = 1;

        else

            reslevel->nbands = 3;



        if (reslevel->coord[0][1] == reslevel->coord[0][0])

            reslevel->num_precincts_x = 0;

        else

            reslevel->num_precincts_x = ff_jpeg2000_ceildivpow2(reslevel->coord[0][1], codsty->log2_prec_width)

                                        - (reslevel->coord[0][0] >> codsty->log2_prec_width);



        if (reslevel->coord[1][1] == reslevel->coord[1][0])

            reslevel->num_precincts_y = 0;

        else

            reslevel->num_precincts_y = ff_jpeg2000_ceildivpow2(reslevel->coord[1][1], codsty->log2_prec_height)

                                        - (reslevel->coord[1][0] >> codsty->log2_prec_height);



        reslevel->band = av_malloc(reslevel->nbands * sizeof(Jpeg2000Band));

        if (!reslevel->band)

            return AVERROR(ENOMEM);

        for (bandno = 0; bandno < reslevel->nbands; bandno++, gbandno++) {

            Jpeg2000Band *band = reslevel->band + bandno;

            int cblkno, precx, precy, precno;

            int x0, y0, x1, y1;

            int xi0, yi0, xi1, yi1;

            int cblkperprecw, cblkperprech;



            if (qntsty->quantsty != JPEG2000_QSTY_NONE) {

                static const uint8_t lut_gain[2][4] = {{0, 0, 0, 0}, {0, 1, 1, 2}};

                int numbps;



                numbps = cbps + lut_gain[codsty->transform][bandno + reslevelno>0];

                band->stepsize = SHL(2048 + qntsty->mant[gbandno], 2 + numbps - qntsty->expn[gbandno]);

            } else

                band->stepsize = 1 << 13;



            if (reslevelno == 0) {  

                band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width-1);

                band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height-1);

                for (i = 0; i < 2; i++)

                    for (j = 0; j < 2; j++)

                        band->coord[i][j] = ff_jpeg2000_ceildivpow2(comp->coord[i][j], declvl-1);

            } else{

                band->codeblock_width = 1 << FFMIN(codsty->log2_cblk_width, codsty->log2_prec_width);

                band->codeblock_height = 1 << FFMIN(codsty->log2_cblk_height, codsty->log2_prec_height);



                for (i = 0; i < 2; i++)

                    for (j = 0; j < 2; j++)

                        band->coord[i][j] = ff_jpeg2000_ceildivpow2(comp->coord[i][j] - (((bandno+1>>i)&1) << declvl-1), declvl);

            }

            band->cblknx = ff_jpeg2000_ceildiv(band->coord[0][1], band->codeblock_width)  - band->coord[0][0] / band->codeblock_width;

            band->cblkny = ff_jpeg2000_ceildiv(band->coord[1][1], band->codeblock_height) - band->coord[1][0] / band->codeblock_height;



            for (j = 0; j < 2; j++)

                band->coord[0][j] = ff_jpeg2000_ceildiv(band->coord[0][j], dx);

            for (j = 0; j < 2; j++)

                band->coord[1][j] = ff_jpeg2000_ceildiv(band->coord[1][j], dy);



            band->cblknx = ff_jpeg2000_ceildiv(band->cblknx, dx);

            band->cblkny = ff_jpeg2000_ceildiv(band->cblkny, dy);



            band->cblk = av_malloc(sizeof(Jpeg2000Cblk) * band->cblknx * band->cblkny);

            if (!band->cblk)

                return AVERROR(ENOMEM);

            band->prec = av_malloc(sizeof(Jpeg2000Cblk) * reslevel->num_precincts_x * reslevel->num_precincts_y);

            if (!band->prec)

                return AVERROR(ENOMEM);



            for (cblkno = 0; cblkno < band->cblknx * band->cblkny; cblkno++) {

                Jpeg2000Cblk *cblk = band->cblk + cblkno;

                cblk->zero = 0;

                cblk->lblock = 3;

                cblk->length = 0;

                cblk->lengthinc = 0;

                cblk->npasses = 0;

            }



            y0 = band->coord[1][0];

            y1 = ((band->coord[1][0] + (1<<codsty->log2_prec_height)) & ~((1<<codsty->log2_prec_height)-1)) - y0;

            yi0 = 0;

            yi1 = ff_jpeg2000_ceildivpow2(y1 - y0, codsty->log2_cblk_height) << codsty->log2_cblk_height;

            yi1 = FFMIN(yi1, band->cblkny);

            cblkperprech = 1<<(codsty->log2_prec_height - codsty->log2_cblk_height);

            for (precy = 0, precno = 0; precy < reslevel->num_precincts_y; precy++) {

                for (precx = 0; precx < reslevel->num_precincts_x; precx++, precno++) {

                    band->prec[precno].yi0 = yi0;

                    band->prec[precno].yi1 = yi1;

                }

                yi1 += cblkperprech;

                yi0 = yi1 - cblkperprech;

                yi1 = FFMIN(yi1, band->cblkny);

            }

            x0 = band->coord[0][0];

            x1 = ((band->coord[0][0] + (1<<codsty->log2_prec_width)) & ~((1<<codsty->log2_prec_width)-1)) - x0;

            xi0 = 0;

            xi1 = ff_jpeg2000_ceildivpow2(x1 - x0, codsty->log2_cblk_width) << codsty->log2_cblk_width;

            xi1 = FFMIN(xi1, band->cblknx);



            cblkperprecw = 1<<(codsty->log2_prec_width - codsty->log2_cblk_width);

            for (precx = 0, precno = 0; precx < reslevel->num_precincts_x; precx++) {

                for (precy = 0; precy < reslevel->num_precincts_y; precy++, precno = 0) {

                    Jpeg2000Prec *prec = band->prec + precno;

                    prec->xi0 = xi0;

                    prec->xi1 = xi1;

                    prec->cblkincl = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,

                                                          prec->yi1 - prec->yi0);

                    prec->zerobits = ff_j2k_tag_tree_init(prec->xi1 - prec->xi0,

                                                          prec->yi1 - prec->yi0);

                    if (!prec->cblkincl || !prec->zerobits)

                        return AVERROR(ENOMEM);



                }

                xi1 += cblkperprecw;

                xi0 = xi1 - cblkperprecw;

                xi1 = FFMIN(xi1, band->cblknx);

            }

        }

    }

    return 0;

}
