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FFmpeg/libavcodec/j2kdec.c
Laurent Aimar 02660a8713 Check for out of bound reads in jpeg 2000 decoder. 
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2011-09-29 06:11:18 +02:00

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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];
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_WARNING, "extra cblk styles %X\n", c->cblk_style);
}
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 bpass_csty_symbol,
int vert_causal_ctx_csty_symbol)
{
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))){
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))){
int xorbit, ctxno = ff_j2k_getsgnctxno(t1->flags[y+1][x+1], &xorbit);
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;
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, 0));
}
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, clnpass_cnt = 0;
int bpass_csty_symbol = J2K_CBLK_BYPASS & codsty->cblk_style;
int vert_causal_ctx_csty_symbol = J2K_CBLK_VSC & codsty->cblk_style;
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;
ff_mqc_initdec(&t1->mqc, cblk->data);
while(passno--){
switch(pass_t){
case 0: decode_sigpass(t1, width, height, bpno+1, bandpos,
bpass_csty_symbol && (clnpass_cnt >= 4), vert_causal_ctx_csty_symbol);
break;
case 1: decode_refpass(t1, width, height, bpno+1);
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
break;
case 2: decode_clnpass(s, t1, width, height, bpno+1, bandpos,
codsty->cblk_style & J2K_CBLK_SEGSYM);
clnpass_cnt = clnpass_cnt + 1;
if (bpass_csty_symbol && clnpass_cnt >= 4)
ff_mqc_initdec(&t1->mqc, cblk->data);
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%tx\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)
{
uint32_t atom_size;
int found_codestream = 0, search_range = 10;
// skip jpeg2k signature atom
s->buf += 12;
while(!found_codestream && search_range && s->buf_end - s->buf >= 8) {
atom_size = AV_RB32(s->buf);
if(AV_RB32(s->buf + 4) == JP2_CODESTREAM) {
found_codestream = 1;
s->buf += 8;
} else {
if (s->buf_end - s->buf < atom_size)
return 0;
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(s->buf_end - s->buf >= 12 &&
(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,
.capabilities = CODEC_CAP_EXPERIMENTAL,
.long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
.pix_fmts =
(enum PixelFormat[]) {PIX_FMT_GRAY8, PIX_FMT_RGB24, -1}
};
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