j2kdec.c 36.5 KB
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/*
 * JPEG2000 image decoder
 * Copyright (c) 2007 Kamil Nowosad
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * JPEG2000 image decoder
 * @file
 * @author Kamil Nowosad
 */

#include "avcodec.h"
#include "bytestream.h"
#include "j2k.h"
#include "libavutil/common.h"

#define JP2_SIG_TYPE    0x6A502020
#define JP2_SIG_VALUE   0x0D0A870A
#define JP2_CODESTREAM  0x6A703263

#define HAD_COC 0x01
#define HAD_QCC 0x02

typedef struct {
   J2kComponent *comp;
   uint8_t properties[4];
   J2kCodingStyle codsty[4];
   J2kQuantStyle  qntsty[4];
} J2kTile;

typedef struct {
    AVCodecContext *avctx;
    AVFrame picture;

    int width, height; ///< image width and height
    int image_offset_x, image_offset_y;
    int tile_offset_x, tile_offset_y;
    uint8_t cbps[4]; ///< bits per sample in particular components
    uint8_t sgnd[4]; ///< if a component is signed
    uint8_t properties[4];
    int cdx[4], cdy[4];
    int precision;
    int ncomponents;
    int tile_width, tile_height; ///< tile size
    int numXtiles, numYtiles;
    int maxtilelen;

    J2kCodingStyle codsty[4];
    J2kQuantStyle  qntsty[4];

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    const uint8_t *buf_start;
    const uint8_t *buf;
    const uint8_t *buf_end;
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    int bit_index;

    int16_t curtileno;

    J2kTile *tile;
} J2kDecoderContext;

static int get_bits(J2kDecoderContext *s, int n)
{
    int res = 0;
    if (s->buf_end - s->buf < ((n - s->bit_index) >> 8))
        return AVERROR(EINVAL);
    while (--n >= 0){
        res <<= 1;
        if (s->bit_index == 0){
            s->bit_index = 7 + (*s->buf != 0xff);
            s->buf++;
        }
        s->bit_index--;
        res |= (*s->buf >> s->bit_index) & 1;
    }
    return res;
}

static void j2k_flush(J2kDecoderContext *s)
{
    if (*s->buf == 0xff)
        s->buf++;
    s->bit_index = 8;
    s->buf++;
}
#if 0
void printcomp(J2kComponent *comp)
{
    int i;
    for (i = 0; i < comp->y1 - comp->y0; i++)
        ff_j2k_printv(comp->data + i * (comp->x1 - comp->x0), comp->x1 - comp->x0);
}

static void nspaces(FILE *fd, int n)
{
    while(n--) putc(' ', fd);
}

static void dump(J2kDecoderContext *s, FILE *fd)
{
    int tileno, compno, reslevelno, bandno, precno;
    fprintf(fd, "XSiz = %d, YSiz = %d, tile_width = %d, tile_height = %d\n"
                "numXtiles = %d, numYtiles = %d, ncomponents = %d\n"
                "tiles:\n",
            s->width, s->height, s->tile_width, s->tile_height,
            s->numXtiles, s->numYtiles, s->ncomponents);
    for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){
        J2kTile *tile = s->tile + tileno;
        nspaces(fd, 2);
        fprintf(fd, "tile %d:\n", tileno);
        for(compno = 0; compno < s->ncomponents; compno++){
            J2kComponent *comp = tile->comp + compno;
            nspaces(fd, 4);
            fprintf(fd, "component %d:\n", compno);
            nspaces(fd, 4);
            fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d\n",
                        comp->x0, comp->x1, comp->y0, comp->y1);
            for(reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
                J2kResLevel *reslevel = comp->reslevel + reslevelno;
                nspaces(fd, 6);
                fprintf(fd, "reslevel %d:\n", reslevelno);
                nspaces(fd, 6);
                fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d, nbands = %d\n",
                        reslevel->x0, reslevel->x1, reslevel->y0,
                        reslevel->y1, reslevel->nbands);
                for(bandno = 0; bandno < reslevel->nbands; bandno++){
                    J2kBand *band = reslevel->band + bandno;
                    nspaces(fd, 8);
                    fprintf(fd, "band %d:\n", bandno);
                    nspaces(fd, 8);
                    fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d,"
                                "codeblock_width = %d, codeblock_height = %d cblknx = %d cblkny = %d\n",
                                band->x0, band->x1,
                                band->y0, band->y1,
                                band->codeblock_width, band->codeblock_height,
                                band->cblknx, band->cblkny);
                    for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
                        J2kPrec *prec = band->prec + precno;
                        nspaces(fd, 10);
                        fprintf(fd, "prec %d:\n", precno);
                        nspaces(fd, 10);
                        fprintf(fd, "xi0 = %d, xi1 = %d, yi0 = %d, yi1 = %d\n",
                                     prec->xi0, prec->xi1, prec->yi0, prec->yi1);
                    }
                }
            }
        }
    }
}
#endif

/** decode the value stored in node */
static int tag_tree_decode(J2kDecoderContext *s, J2kTgtNode *node, int threshold)
{
    J2kTgtNode *stack[30];
    int sp = -1, curval = 0;

    while(node && !node->vis){
        stack[++sp] = node;
        node = node->parent;
    }

    if (node)
        curval = node->val;
    else
        curval = stack[sp]->val;

    while(curval < threshold && sp >= 0){
        if (curval < stack[sp]->val)
            curval = stack[sp]->val;
        while (curval < threshold){
            int ret;
            if ((ret = get_bits(s, 1)) > 0){
                stack[sp]->vis++;
                break;
            } else if (!ret)
                curval++;
            else
                return ret;
        }
        stack[sp]->val = curval;
        sp--;
    }
    return curval;
}

/* marker segments */
/** get sizes and offsets of image, tiles; number of components */
static int get_siz(J2kDecoderContext *s)
{
    int i, ret;

    if (s->buf_end - s->buf < 36)
        return AVERROR(EINVAL);

                        bytestream_get_be16(&s->buf); // Rsiz (skipped)
             s->width = bytestream_get_be32(&s->buf); // width
            s->height = bytestream_get_be32(&s->buf); // height
    s->image_offset_x = bytestream_get_be32(&s->buf); // X0Siz
    s->image_offset_y = bytestream_get_be32(&s->buf); // Y0Siz

        s->tile_width = bytestream_get_be32(&s->buf); // XTSiz
       s->tile_height = bytestream_get_be32(&s->buf); // YTSiz
     s->tile_offset_x = bytestream_get_be32(&s->buf); // XT0Siz
     s->tile_offset_y = bytestream_get_be32(&s->buf); // YT0Siz
       s->ncomponents = bytestream_get_be16(&s->buf); // CSiz

    if (s->buf_end - s->buf < 2 * s->ncomponents)
        return AVERROR(EINVAL);

    for (i = 0; i < s->ncomponents; i++){ // Ssiz_i XRsiz_i, YRsiz_i
        uint8_t x = bytestream_get_byte(&s->buf);
        s->cbps[i] = (x & 0x7f) + 1;
        s->precision = FFMAX(s->cbps[i], s->precision);
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        s->sgnd[i] = !!(x & 0x80);
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        s->cdx[i] = bytestream_get_byte(&s->buf);
        s->cdy[i] = bytestream_get_byte(&s->buf);
    }

    s->numXtiles = ff_j2k_ceildiv(s->width - s->tile_offset_x, s->tile_width);
    s->numYtiles = ff_j2k_ceildiv(s->height - s->tile_offset_y, s->tile_height);

    s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(J2kTile));
    if (!s->tile)
        return AVERROR(ENOMEM);

    for (i = 0; i < s->numXtiles * s->numYtiles; i++){
        J2kTile *tile = s->tile + i;

        tile->comp = av_mallocz(s->ncomponents * sizeof(J2kComponent));
        if (!tile->comp)
            return AVERROR(ENOMEM);
    }

    s->avctx->width = s->width - s->image_offset_x;
    s->avctx->height = s->height - s->image_offset_y;

    switch(s->ncomponents){
        case 1: if (s->precision > 8) {
                    s->avctx->pix_fmt    = PIX_FMT_GRAY16;
                } else s->avctx->pix_fmt = PIX_FMT_GRAY8;
                break;
        case 3: if (s->precision > 8) {
                    s->avctx->pix_fmt    = PIX_FMT_RGB48;
                } else s->avctx->pix_fmt = PIX_FMT_RGB24;
                break;
        case 4: s->avctx->pix_fmt = PIX_FMT_BGRA; break;
    }

    if (s->picture.data[0])
        s->avctx->release_buffer(s->avctx, &s->picture);

    if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0)
        return ret;

    s->picture.pict_type = FF_I_TYPE;
    s->picture.key_frame = 1;

    return 0;
}

/** get common part for COD and COC segments */
static int get_cox(J2kDecoderContext *s, J2kCodingStyle *c)
{
    if (s->buf_end - s->buf < 5)
        return AVERROR(EINVAL);
          c->nreslevels = bytestream_get_byte(&s->buf) + 1; // num of resolution levels - 1
     c->log2_cblk_width = bytestream_get_byte(&s->buf) + 2; // cblk width
    c->log2_cblk_height = bytestream_get_byte(&s->buf) + 2; // cblk height

    c->cblk_style = bytestream_get_byte(&s->buf);
    if (c->cblk_style != 0){ // cblk style
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        av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
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    }
    c->transform = bytestream_get_byte(&s->buf); // transformation
    if (c->csty & J2K_CSTY_PREC) {
        int i;
        for (i = 0; i < c->nreslevels; i++)
            bytestream_get_byte(&s->buf);
    }
    return 0;
}

/** get coding parameters for a particular tile or whole image*/
static int get_cod(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
{
    J2kCodingStyle tmp;
    int compno;

    if (s->buf_end - s->buf < 5)
        return AVERROR(EINVAL);

    tmp.log2_prec_width  =
    tmp.log2_prec_height = 15;

    tmp.csty = bytestream_get_byte(&s->buf);

    if (bytestream_get_byte(&s->buf)){ // progression level
        av_log(s->avctx, AV_LOG_ERROR, "only LRCP progression supported\n");
        return -1;
    }

    tmp.nlayers = bytestream_get_be16(&s->buf);
        tmp.mct = bytestream_get_byte(&s->buf); // multiple component transformation

    get_cox(s, &tmp);
    for (compno = 0; compno < s->ncomponents; compno++){
        if (!(properties[compno] & HAD_COC))
            memcpy(c + compno, &tmp, sizeof(J2kCodingStyle));
    }
    return 0;
}

/** get coding parameters for a component in the whole image on a particular tile */
static int get_coc(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
{
    int compno;

    if (s->buf_end - s->buf < 2)
        return AVERROR(EINVAL);

    compno = bytestream_get_byte(&s->buf);

    c += compno;
    c->csty = bytestream_get_byte(&s->buf);
    get_cox(s, c);

    properties[compno] |= HAD_COC;
    return 0;
}

/** get common part for QCD and QCC segments */
static int get_qcx(J2kDecoderContext *s, int n, J2kQuantStyle *q)
{
    int i, x;

    if (s->buf_end - s->buf < 1)
        return AVERROR(EINVAL);

    x = bytestream_get_byte(&s->buf); // Sqcd

    q->nguardbits = x >> 5;
      q->quantsty = x & 0x1f;

    if (q->quantsty == J2K_QSTY_NONE){
        n -= 3;
        if (s->buf_end - s->buf < n)
            return AVERROR(EINVAL);
        for (i = 0; i < n; i++)
            q->expn[i] = bytestream_get_byte(&s->buf) >> 3;
    } else if (q->quantsty == J2K_QSTY_SI){
        if (s->buf_end - s->buf < 2)
            return AVERROR(EINVAL);
        x = bytestream_get_be16(&s->buf);
        q->expn[0] = x >> 11;
        q->mant[0] = x & 0x7ff;
        for (i = 1; i < 32 * 3; i++){
            int curexpn = FFMAX(0, q->expn[0] - (i-1)/3);
            q->expn[i] = curexpn;
            q->mant[i] = q->mant[0];
        }
    } else{
        n = (n - 3) >> 1;
        if (s->buf_end - s->buf < n)
            return AVERROR(EINVAL);
        for (i = 0; i < n; i++){
            x = bytestream_get_be16(&s->buf);
            q->expn[i] = x >> 11;
            q->mant[i] = x & 0x7ff;
        }
    }
    return 0;
}

/** get quantization parameters for a particular tile or a whole image */
static int get_qcd(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
{
    J2kQuantStyle tmp;
    int compno;

    if (get_qcx(s, n, &tmp))
        return -1;
    for (compno = 0; compno < s->ncomponents; compno++)
        if (!(properties[compno] & HAD_QCC))
            memcpy(q + compno, &tmp, sizeof(J2kQuantStyle));
    return 0;
}

/** get quantization parameters for a component in the whole image on in a particular tile */
static int get_qcc(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
{
    int compno;

    if (s->buf_end - s->buf < 1)
        return AVERROR(EINVAL);

    compno = bytestream_get_byte(&s->buf);
    properties[compno] |= HAD_QCC;
    return get_qcx(s, n-1, q+compno);
}

/** get start of tile segment */
static uint8_t get_sot(J2kDecoderContext *s)
{
    if (s->buf_end - s->buf < 4)
        return AVERROR(EINVAL);

    s->curtileno = bytestream_get_be16(&s->buf); ///< Isot

    s->buf += 4; ///< Psot (ignored)

    if (!bytestream_get_byte(&s->buf)){ ///< TPsot
        J2kTile *tile = s->tile + s->curtileno;

        /* copy defaults */
        memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(J2kCodingStyle));
        memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(J2kQuantStyle));
    }
    bytestream_get_byte(&s->buf); ///< TNsot

    return 0;
}

static int init_tile(J2kDecoderContext *s, int tileno)
{
    int compno,
        tilex = tileno % s->numXtiles,
        tiley = tileno / s->numXtiles;
    J2kTile *tile = s->tile + tileno;

    if (!tile->comp)
        return AVERROR(ENOMEM);
    for (compno = 0; compno < s->ncomponents; compno++){
        J2kComponent *comp = tile->comp + compno;
        J2kCodingStyle *codsty = tile->codsty + compno;
        J2kQuantStyle  *qntsty = tile->qntsty + compno;
        int ret; // global bandno

        comp->coord[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x);
        comp->coord[0][1] = FFMIN((tilex+1)*s->tile_width + s->tile_offset_x, s->width);
        comp->coord[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y);
        comp->coord[1][1] = FFMIN((tiley+1)*s->tile_height + s->tile_offset_y, s->height);

        if (ret = ff_j2k_init_component(comp, codsty, qntsty, s->cbps[compno], s->cdx[compno], s->cdy[compno]))
            return ret;
    }
    return 0;
}

/** read the number of coding passes */
static int getnpasses(J2kDecoderContext *s)
{
    int num;
    if (!get_bits(s, 1))
        return 1;
    if (!get_bits(s, 1))
        return 2;
    if ((num = get_bits(s, 2)) != 3)
        return num < 0 ? num : 3 + num;
    if ((num = get_bits(s, 5)) != 31)
        return num < 0 ? num : 6 + num;
    num = get_bits(s, 7);
    return num < 0 ? num : 37 + num;
}

static int getlblockinc(J2kDecoderContext *s)
{
    int res = 0, ret;
    while (ret = get_bits(s, 1)){
        if (ret < 0)
            return ret;
        res++;
    }
    return res;
}

static int decode_packet(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kResLevel *rlevel, int precno,
                         int layno, uint8_t *expn, int numgbits)
{
    int bandno, cblkny, cblknx, cblkno, ret;

    if (!(ret = get_bits(s, 1))){
        j2k_flush(s);
        return 0;
    } else if (ret < 0)
        return ret;

    for (bandno = 0; bandno < rlevel->nbands; bandno++){
        J2kBand *band = rlevel->band + bandno;
        J2kPrec *prec = band->prec + precno;
        int pos = 0;

        if (band->coord[0][0] == band->coord[0][1]
        ||  band->coord[1][0] == band->coord[1][1])
            continue;

        for (cblkny = prec->yi0; cblkny < prec->yi1; cblkny++)
            for(cblknx = prec->xi0, cblkno = cblkny * band->cblknx + cblknx; cblknx < prec->xi1; cblknx++, cblkno++, pos++){
                J2kCblk *cblk = band->cblk + cblkno;
                int incl, newpasses, llen;

                if (cblk->npasses)
                    incl = get_bits(s, 1);
                else
                    incl = tag_tree_decode(s, prec->cblkincl + pos, 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 + pos, 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;
            }
    }
    j2k_flush(s);

    if (codsty->csty & J2K_CSTY_EPH) {
        if (AV_RB16(s->buf) == J2K_EPH) {
            s->buf += 2;
        } else {
            av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
        }
    }

    for (bandno = 0; bandno < rlevel->nbands; bandno++){
        J2kBand *band = rlevel->band + bandno;
        int yi, cblknw = band->prec[precno].xi1 - band->prec[precno].xi0;
        for (yi = band->prec[precno].yi0; yi < band->prec[precno].yi1; yi++){
            int xi;
            for (xi = band->prec[precno].xi0; xi < band->prec[precno].xi1; xi++){
                J2kCblk *cblk = band->cblk + yi * cblknw + xi;
                if (s->buf_end - s->buf < cblk->lengthinc)
                    return AVERROR(EINVAL);
                bytestream_get_buffer(&s->buf, cblk->data, cblk->lengthinc);
                cblk->length += cblk->lengthinc;
                cblk->lengthinc = 0;
            }
        }
    }
    return 0;
}

static int decode_packets(J2kDecoderContext *s, J2kTile *tile)
{
    int layno, reslevelno, compno, precno, ok_reslevel;
    s->bit_index = 8;
    for (layno = 0; layno < tile->codsty[0].nlayers; layno++){
        ok_reslevel = 1;
        for (reslevelno = 0; ok_reslevel; reslevelno++){
            ok_reslevel = 0;
            for (compno = 0; compno < s->ncomponents; compno++){
                J2kCodingStyle *codsty = tile->codsty + compno;
                J2kQuantStyle  *qntsty = tile->qntsty + compno;
                if (reslevelno < codsty->nreslevels){
                    J2kResLevel *rlevel = tile->comp[compno].reslevel + reslevelno;
                    ok_reslevel = 1;
                    for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++){
                        if (decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn +
                                          (reslevelno ? 3*(reslevelno-1)+1 : 0), qntsty->nguardbits))
                            return -1;
                    }
                }
            }
        }
    }
    return 0;
}

/* TIER-1 routines */
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static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno, int bpass_csty_symbol,
                           int vert_causal_ctx_csty_symbol)
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{
    int mask = 3 << (bpno - 1), y0, x, y;

    for (y0 = 0; y0 < height; y0 += 4)
        for (x = 0; x < width; x++)
            for (y = y0; y < height && y < y0+4; y++){
                if ((t1->flags[y+1][x+1] & J2K_T1_SIG_NB)
                && !(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS))){
604 605 606
                    int vert_causal_ctx_csty_loc_symbol = vert_causal_ctx_csty_symbol && (x == 3 && y == 3);
                    if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno,
                                      vert_causal_ctx_csty_loc_symbol))){
607
                        int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
608 609 610 611 612
                        if (bpass_csty_symbol)
                             t1->data[y][x] = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? -mask : mask;
                        else
                             t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ?
                                               -mask : mask;
613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665

                        ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0);
                    }
                    t1->flags[y+1][x+1] |= J2K_T1_VIS;
                }
            }
}

static void decode_refpass(J2kT1Context *t1, int width, int height, int bpno)
{
    int phalf, nhalf;
    int y0, x, y;

    phalf = 1 << (bpno - 1);
    nhalf = -phalf;

    for (y0 = 0; y0 < height; y0 += 4)
        for (x = 0; x < width; x++)
            for (y = y0; y < height && y < y0+4; y++){
                if ((t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)) == J2K_T1_SIG){
                    int ctxno = ff_j2k_getrefctxno(t1->flags[y+1][x+1]);
                    int r = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ? phalf : nhalf;
                    t1->data[y][x] += t1->data[y][x] < 0 ? -r : r;
                    t1->flags[y+1][x+1] |= J2K_T1_REF;
                }
            }
}

static void decode_clnpass(J2kDecoderContext *s, J2kT1Context *t1, int width, int height,
                           int bpno, int bandno, int seg_symbols)
{
    int mask = 3 << (bpno - 1), y0, x, y, runlen, dec;

    for (y0 = 0; y0 < height; y0 += 4) {
        for (x = 0; x < width; x++){
            if (y0 + 3 < height && !(
            (t1->flags[y0+1][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
            (t1->flags[y0+2][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
            (t1->flags[y0+3][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)) ||
            (t1->flags[y0+4][x+1] & (J2K_T1_SIG_NB | J2K_T1_VIS | J2K_T1_SIG)))){
                if (!ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_RL))
                    continue;
                runlen = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
                runlen = (runlen << 1) | ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
                dec = 1;
            } else{
                runlen = 0;
                dec = 0;
            }

            for (y = y0 + runlen; y < y0 + 4 && y < height; y++){
                if (!dec){
                    if (!(t1->flags[y+1][x+1] & (J2K_T1_SIG | J2K_T1_VIS)))
666 667
                        dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1],
                                                                                             bandno, 0));
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                }
                if (dec){
                    int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
                    t1->data[y][x] = (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ctxno) ^ xorbit) ? -mask : mask;
                    ff_j2k_set_significant(t1, x, y, t1->data[y][x] < 0);
                }
                dec = 0;
                t1->flags[y+1][x+1] &= ~J2K_T1_VIS;
            }
        }
    }
    if (seg_symbols) {
        int val;
        val = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
        val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
        val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
        val = (val << 1) + ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + MQC_CX_UNI);
        if (val != 0xa) {
            av_log(s->avctx, AV_LOG_ERROR,"Segmentation symbol value incorrect\n");
        }
    }
}

static int decode_cblk(J2kDecoderContext *s, J2kCodingStyle *codsty, J2kT1Context *t1, J2kCblk *cblk,
                       int width, int height, int bandpos)
{
694
    int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y, clnpass_cnt = 0;
695 696
    int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style;
    int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style;
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    for (y = 0; y < height+2; y++)
        memset(t1->flags[y], 0, (width+2)*sizeof(int));

    for (y = 0; y < height; y++)
        memset(t1->data[y], 0, width*sizeof(int));

    cblk->data[cblk->length] = 0xff;
    cblk->data[cblk->length+1] = 0xff;
706
    ff_mqc_initdec(&t1->mqc, cblk->data);
707 708 709

    while(passno--){
        switch(pass_t){
710 711
            case 0: decode_sigpass(t1, width, height, bpno+1, bandpos,
                                  bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
712 713
                    break;
            case 1: decode_refpass(t1, width, height, bpno+1);
714 715
                    if (bpass_csty_symbol && clnpass_cnt >= 4)
                        ff_mqc_initdec(&t1->mqc, cblk->data);
716 717 718
                    break;
            case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
                                   codsty->cblk_style & J2K_CBLK_SEGSYM);
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                    clnpass_cnt = clnpass_cnt + 1;
                    if (bpass_csty_symbol && clnpass_cnt >= 4)
                       ff_mqc_initdec(&t1->mqc, cblk->data);
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                    break;
        }

        pass_t++;
        if (pass_t == 3){
            bpno--;
            pass_t = 0;
        }
    }
    return 0;
}

static void mct_decode(J2kDecoderContext *s, J2kTile *tile)
{
    int i, *src[3], i0, i1, i2, csize = 1;

    for (i = 0; i < 3; i++)
        src[i] = tile->comp[i].data;

    for (i = 0; i < 2; i++)
        csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0];

    if (tile->codsty[0].transform == FF_DWT97){
        for (i = 0; i < csize; i++){
            i0 = *src[0] + (*src[2] * 46802 >> 16);
            i1 = *src[0] - (*src[1] * 22553 + *src[2] * 46802 >> 16);
            i2 = *src[0] + (116130 * *src[1] >> 16);
            *src[0]++ = i0;
            *src[1]++ = i1;
            *src[2]++ = i2;
        }
    } else{
        for (i = 0; i < csize; i++){
            i1 = *src[0] - (*src[2] + *src[1] >> 2);
            i0 = i1 + *src[2];
            i2 = i1 + *src[1];
            *src[0]++ = i0;
            *src[1]++ = i1;
            *src[2]++ = i2;
        }
    }
}

static int decode_tile(J2kDecoderContext *s, J2kTile *tile)
{
    int compno, reslevelno, bandno;
    int x, y, *src[4];
    uint8_t *line;
    J2kT1Context t1;

    for (compno = 0; compno < s->ncomponents; compno++){
        J2kComponent *comp = tile->comp + compno;
        J2kCodingStyle *codsty = tile->codsty + compno;

        for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
            J2kResLevel *rlevel = comp->reslevel + reslevelno;
            for (bandno = 0; bandno < rlevel->nbands; bandno++){
                J2kBand *band = rlevel->band + bandno;
                int cblkx, cblky, cblkno=0, xx0, x0, xx1, y0, yy0, yy1, bandpos;

                bandpos = bandno + (reslevelno > 0);

                yy0 = bandno == 0 ? 0 : comp->reslevel[reslevelno-1].coord[1][1] - comp->reslevel[reslevelno-1].coord[1][0];
                y0 = yy0;
                yy1 = FFMIN(ff_j2k_ceildiv(band->coord[1][0] + 1, band->codeblock_height) * band->codeblock_height,
                            band->coord[1][1]) - band->coord[1][0] + yy0;

                if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1])
                    continue;

                for (cblky = 0; cblky < band->cblkny; cblky++){
                    if (reslevelno == 0 || bandno == 1)
                        xx0 = 0;
                    else
                        xx0 = comp->reslevel[reslevelno-1].coord[0][1] - comp->reslevel[reslevelno-1].coord[0][0];
                    x0 = xx0;
                    xx1 = FFMIN(ff_j2k_ceildiv(band->coord[0][0] + 1, band->codeblock_width) * band->codeblock_width,
                                band->coord[0][1]) - band->coord[0][0] + xx0;

                    for (cblkx = 0; cblkx < band->cblknx; cblkx++, cblkno++){
                        int y, x;
                        decode_cblk(s, codsty, &t1, band->cblk + cblkno, xx1 - xx0, yy1 - yy0, bandpos);
                        if (codsty->transform == FF_DWT53){
                            for (y = yy0; y < yy1; y+=s->cdy[compno]){
                                int *ptr = t1.data[y-yy0];
                                for (x = xx0; x < xx1; x+=s->cdx[compno]){
                                    comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = *ptr++ >> 1;
                                }
                            }
                        } else{
                            for (y = yy0; y < yy1; y+=s->cdy[compno]){
                                int *ptr = t1.data[y-yy0];
                                for (x = xx0; x < xx1; x+=s->cdx[compno]){
                                    int tmp = ((int64_t)*ptr++) * ((int64_t)band->stepsize) >> 13, tmp2;
                                    tmp2 = FFABS(tmp>>1) + FFABS(tmp&1);
                                    comp->data[(comp->coord[0][1] - comp->coord[0][0]) * y + x] = tmp < 0 ? -tmp2 : tmp2;
                                }
                            }
                        }
                        xx0 = xx1;
                        xx1 = FFMIN(xx1 + band->codeblock_width, band->coord[0][1] - band->coord[0][0] + x0);
                    }
                    yy0 = yy1;
                    yy1 = FFMIN(yy1 + band->codeblock_height, band->coord[1][1] - band->coord[1][0] + y0);
                }
            }
        }
        ff_j2k_dwt_decode(&comp->dwt, comp->data);
        src[compno] = comp->data;
    }
    if (tile->codsty[0].mct)
        mct_decode(s, tile);

    if (s->avctx->pix_fmt == PIX_FMT_BGRA) // RGBA -> BGRA
        FFSWAP(int *, src[0], src[2]);

    if (s->precision <= 8) {
        for (compno = 0; compno < s->ncomponents; compno++){
            y = tile->comp[compno].coord[1][0] - s->image_offset_y;
            line = s->picture.data[0] + y * s->picture.linesize[0];
            for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]){
                uint8_t *dst;

                x = tile->comp[compno].coord[0][0] - s->image_offset_x;
                dst = line + x * s->ncomponents + compno;

                for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s->cdx[compno]) {
                    *src[compno] += 1 << (s->cbps[compno]-1);
                    if (*src[compno] < 0)
                        *src[compno] = 0;
                    else if (*src[compno] >= (1 << s->cbps[compno]))
                        *src[compno] = (1 << s->cbps[compno]) - 1;
                    *dst = *src[compno]++;
                    dst += s->ncomponents;
                }
                line += s->picture.linesize[0];
            }
        }
    } else {
        for (compno = 0; compno < s->ncomponents; compno++) {
            y = tile->comp[compno].coord[1][0] - s->image_offset_y;
            line = s->picture.data[0] + y * s->picture.linesize[0];
            for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) {
                uint16_t *dst;
                x = tile->comp[compno].coord[0][0] - s->image_offset_x;
                dst = line + (x * s->ncomponents + compno) * 2;
                for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) {
                    int32_t val;
                    val = *src[compno]++ << (16 - s->cbps[compno]);
                    val += 1 << 15;
                    val = av_clip(val, 0, (1 << 16) - 1);
                    *dst = val;
                    dst += s->ncomponents;
                }
                line += s->picture.linesize[0];
            }
        }
    }
    return 0;
}

static void cleanup(J2kDecoderContext *s)
{
    int tileno, compno;
    for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){
        for (compno = 0; compno < s->ncomponents; compno++){
            J2kComponent *comp = s->tile[tileno].comp + compno;
            J2kCodingStyle *codsty = s->tile[tileno].codsty + compno;

            ff_j2k_cleanup(comp, codsty);
        }
        av_freep(&s->tile[tileno].comp);
    }
    av_freep(&s->tile);
}

static int decode_codestream(J2kDecoderContext *s)
{
    J2kCodingStyle *codsty = s->codsty;
    J2kQuantStyle  *qntsty = s->qntsty;
    uint8_t *properties = s->properties;

    for (;;){
        int marker, len, ret = 0;
906
        const uint8_t *oldbuf;
907 908 909 910 911 912
        if (s->buf_end - s->buf < 2){
            av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
            break;
        }

        marker = bytestream_get_be16(&s->buf);
913 914
        if(s->avctx->debug & FF_DEBUG_STARTCODE)
            av_log(s->avctx, AV_LOG_DEBUG, "marker 0x%.4X at pos 0x%x\n", marker, s->buf - s->buf_start - 4);
915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952
        oldbuf = s->buf;

        if (marker == J2K_SOD){
            J2kTile *tile = s->tile + s->curtileno;
            if (ret = init_tile(s, s->curtileno))
                return ret;
            if (ret = decode_packets(s, tile))
                return ret;
            continue;
        }
        if (marker == J2K_EOC)
            break;

        if (s->buf_end - s->buf < 2)
            return AVERROR(EINVAL);
        len = bytestream_get_be16(&s->buf);
        switch(marker){
            case J2K_SIZ:
                ret = get_siz(s); break;
            case J2K_COC:
                ret = get_coc(s, codsty, properties); break;
            case J2K_COD:
                ret = get_cod(s, codsty, properties); break;
            case J2K_QCC:
                ret = get_qcc(s, len, qntsty, properties); break;
            case J2K_QCD:
                ret = get_qcd(s, len, qntsty, properties); break;
            case J2K_SOT:
                if (!(ret = get_sot(s))){
                    codsty = s->tile[s->curtileno].codsty;
                    qntsty = s->tile[s->curtileno].qntsty;
                    properties = s->tile[s->curtileno].properties;
                }
                break;
            case J2K_COM:
                // the comment is ignored
                s->buf += len - 2; break;
            default:
953
                av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%tx\n", marker, s->buf - s->buf_start - 4);
954 955 956 957 958 959 960 961 962 963 964 965
                s->buf += len - 2; break;
        }
        if (s->buf - oldbuf != len || ret){
            av_log(s->avctx, AV_LOG_ERROR, "error during processing marker segment %.4x\n", marker);
            return ret ? ret : -1;
        }
    }
    return 0;
}

static int jp2_find_codestream(J2kDecoderContext *s)
{
966
    uint32_t atom_size;
967 968 969 970 971
    int found_codestream = 0, search_range = 10;

    // skip jpeg2k signature atom
    s->buf += 12;

972
    while(!found_codestream && search_range && s->buf_end - s->buf >= 8) {
973 974 975 976 977
        atom_size = AV_RB32(s->buf);
        if(AV_RB32(s->buf + 4) == JP2_CODESTREAM) {
            found_codestream = 1;
            s->buf += 8;
        } else {
978 979
            if (s->buf_end - s->buf < atom_size)
                return 0;
980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011
            s->buf += atom_size;
            search_range--;
        }
    }

    if(found_codestream)
        return 1;
    return 0;
}

static int decode_frame(AVCodecContext *avctx,
                        void *data, int *data_size,
                        AVPacket *avpkt)
{
    J2kDecoderContext *s = avctx->priv_data;
    AVFrame *picture = data;
    int tileno, ret;

    s->avctx = avctx;
    av_log(s->avctx, AV_LOG_DEBUG, "start\n");

    // init
    s->buf = s->buf_start = avpkt->data;
    s->buf_end = s->buf_start + avpkt->size;
    s->curtileno = -1;

    ff_j2k_init_tier1_luts();

    if (s->buf_end - s->buf < 2)
        return AVERROR(EINVAL);

    // check if the image is in jp2 format
1012 1013
    if(s->buf_end - s->buf >= 12 &&
       (AV_RB32(s->buf) == 12) && (AV_RB32(s->buf + 4) == JP2_SIG_TYPE) &&
1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
       (AV_RB32(s->buf + 8) == JP2_SIG_VALUE)) {
        if(!jp2_find_codestream(s)) {
            av_log(avctx, AV_LOG_ERROR, "couldn't find jpeg2k codestream atom\n");
            return -1;
        }
    }

    if (bytestream_get_be16(&s->buf) != J2K_SOC){
        av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
        return -1;
    }
    if (ret = decode_codestream(s))
        return ret;

    for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
        if (ret = decode_tile(s, s->tile + tileno))
            return ret;

    cleanup(s);
    av_log(s->avctx, AV_LOG_DEBUG, "end\n");

    *data_size = sizeof(AVPicture);
    *picture = s->picture;

    return s->buf - s->buf_start;
}

static av_cold int j2kdec_init(AVCodecContext *avctx)
{
    J2kDecoderContext *s = avctx->priv_data;

    avcodec_get_frame_defaults((AVFrame*)&s->picture);
    avctx->coded_frame = (AVFrame*)&s->picture;
    return 0;
}

static av_cold int decode_end(AVCodecContext *avctx)
{
    J2kDecoderContext *s = avctx->priv_data;

    if (s->picture.data[0])
        avctx->release_buffer(avctx, &s->picture);

    return 0;
}

AVCodec ff_jpeg2000_decoder = {
    "j2k",
    AVMEDIA_TYPE_VIDEO,
    CODEC_ID_JPEG2000,
    sizeof(J2kDecoderContext),
    j2kdec_init,
    NULL,
    decode_end,
    decode_frame,
1069
    .capabilities = CODEC_CAP_EXPERIMENTAL,
1070
    .long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
1071 1072 1073
    .pix_fmts =
        (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_RGB24, -1}
};