Add Kamil Nowosads j2k code.

This needs work but it should not rot in soc svn.

1 files changed, 1053 insertions, 0 deletions

diff --git a/libavcodec/j2kdec.c b/libavcodec/j2kdec.c
new file mode 100644
index 0000000000..112c0ffd3e
--- /dev/null
+++ b/libavcodec/j2kdec.c
@@ -0,0 +1,1053 @@
+/*
+ * 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];
+
+    uint8_t *buf_start;
+    uint8_t *buf;
+    uint8_t *buf_end;
+    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);
+        s->sgnd[i] = (x & 0x80) == 1;
+        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
+        av_log(s->avctx, AV_LOG_ERROR, "no extra cblk styles supported\n");
+        return -1;
+    }
+    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 */
+static void decode_sigpass(J2kT1Context *t1, int width, int height, int bpno, int bandno)
+{
+    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))){
+                    if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno))){
+                        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);
+                    }
+                    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)))
+                        dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_j2k_getnbctxno(t1->flags[y+1][x+1], bandno));
+                }
+                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)
+{
+    int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y;
+
+    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));
+
+    ff_mqc_initdec(&t1->mqc, cblk->data);
+    cblk->data[cblk->length] = 0xff;
+    cblk->data[cblk->length+1] = 0xff;
+
+    while(passno--){
+        switch(pass_t){
+            case 0: decode_sigpass(t1, width, height, bpno+1, bandpos);
+                    break;
+            case 1: decode_refpass(t1, width, height, bpno+1);
+                    break;
+            case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
+                                   codsty->cblk_style & J2K_CBLK_SEGSYM);
+                    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;
+        uint8_t *oldbuf;
+        if (s->buf_end - s->buf < 2){
+            av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
+            break;
+        }
+
+        marker = bytestream_get_be16(&s->buf);
+        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:
+                av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%x\n", marker, s->buf - s->buf_start - 4);
+                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)
+{
+    int32_t atom_size;
+    int found_codestream = 0, search_range = 10;
+
+    // skip jpeg2k signature atom
+    s->buf += 12;
+
+    while(!found_codestream && search_range) {
+        atom_size = AV_RB32(s->buf);
+        if(AV_RB32(s->buf + 4) == JP2_CODESTREAM) {
+            found_codestream = 1;
+            s->buf += 8;
+        } else {
+            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
+    if((AV_RB32(s->buf) == 12) && (AV_RB32(s->buf + 4) == JP2_SIG_TYPE) &&
+       (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,
+    0,
+    .pix_fmts =
+        (enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_RGB24, -1}
+};