mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-22 09:15:06 +02:00
1100 lines
37 KiB
C
1100 lines
37 KiB
C
/*
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* JPEG2000 image decoder
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* Copyright (c) 2007 Kamil Nowosad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* JPEG2000 image decoder
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* @file
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* @author Kamil Nowosad
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*/
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// #define DEBUG
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#include "avcodec.h"
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#include "bytestream.h"
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#include "j2k.h"
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#include "libavutil/common.h"
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#define JP2_SIG_TYPE 0x6A502020
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#define JP2_SIG_VALUE 0x0D0A870A
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#define JP2_CODESTREAM 0x6A703263
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#define HAD_COC 0x01
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#define HAD_QCC 0x02
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typedef struct {
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J2kComponent *comp;
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uint8_t properties[4];
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J2kCodingStyle codsty[4];
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J2kQuantStyle qntsty[4];
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} J2kTile;
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typedef struct {
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AVCodecContext *avctx;
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AVFrame picture;
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GetByteContext g;
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int width, height; ///< image width and height
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int image_offset_x, image_offset_y;
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int tile_offset_x, tile_offset_y;
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uint8_t cbps[4]; ///< bits per sample in particular components
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uint8_t sgnd[4]; ///< if a component is signed
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uint8_t properties[4];
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int cdx[4], cdy[4];
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int precision;
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int ncomponents;
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int tile_width, tile_height; ///< tile size
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int numXtiles, numYtiles;
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int maxtilelen;
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J2kCodingStyle codsty[4];
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J2kQuantStyle qntsty[4];
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int bit_index;
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int16_t curtileno;
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J2kTile *tile;
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} J2kDecoderContext;
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static int get_bits(J2kDecoderContext *s, int n)
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{
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int res = 0;
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while (--n >= 0){
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res <<= 1;
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if (s->bit_index == 0) {
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s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu);
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}
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s->bit_index--;
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res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1;
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}
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return res;
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}
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static void j2k_flush(J2kDecoderContext *s)
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{
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if (bytestream2_get_byte(&s->g) == 0xff)
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bytestream2_skip(&s->g, 1);
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s->bit_index = 8;
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}
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#if 0
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void printcomp(J2kComponent *comp)
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{
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int i;
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for (i = 0; i < comp->y1 - comp->y0; i++)
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ff_j2k_printv(comp->data + i * (comp->x1 - comp->x0), comp->x1 - comp->x0);
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}
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static void nspaces(FILE *fd, int n)
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{
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while(n--) putc(' ', fd);
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}
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static void dump(J2kDecoderContext *s, FILE *fd)
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{
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int tileno, compno, reslevelno, bandno, precno;
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fprintf(fd, "XSiz = %d, YSiz = %d, tile_width = %d, tile_height = %d\n"
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"numXtiles = %d, numYtiles = %d, ncomponents = %d\n"
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"tiles:\n",
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s->width, s->height, s->tile_width, s->tile_height,
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s->numXtiles, s->numYtiles, s->ncomponents);
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for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++){
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J2kTile *tile = s->tile + tileno;
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nspaces(fd, 2);
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fprintf(fd, "tile %d:\n", tileno);
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for(compno = 0; compno < s->ncomponents; compno++){
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J2kComponent *comp = tile->comp + compno;
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nspaces(fd, 4);
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fprintf(fd, "component %d:\n", compno);
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nspaces(fd, 4);
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fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d\n",
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comp->x0, comp->x1, comp->y0, comp->y1);
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for(reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++){
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J2kResLevel *reslevel = comp->reslevel + reslevelno;
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nspaces(fd, 6);
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fprintf(fd, "reslevel %d:\n", reslevelno);
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nspaces(fd, 6);
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fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d, nbands = %d\n",
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reslevel->x0, reslevel->x1, reslevel->y0,
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reslevel->y1, reslevel->nbands);
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for(bandno = 0; bandno < reslevel->nbands; bandno++){
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J2kBand *band = reslevel->band + bandno;
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nspaces(fd, 8);
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fprintf(fd, "band %d:\n", bandno);
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nspaces(fd, 8);
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fprintf(fd, "x0 = %d, x1 = %d, y0 = %d, y1 = %d,"
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"codeblock_width = %d, codeblock_height = %d cblknx = %d cblkny = %d\n",
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band->x0, band->x1,
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band->y0, band->y1,
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band->codeblock_width, band->codeblock_height,
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band->cblknx, band->cblkny);
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for (precno = 0; precno < reslevel->num_precincts_x * reslevel->num_precincts_y; precno++){
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J2kPrec *prec = band->prec + precno;
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nspaces(fd, 10);
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fprintf(fd, "prec %d:\n", precno);
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nspaces(fd, 10);
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fprintf(fd, "xi0 = %d, xi1 = %d, yi0 = %d, yi1 = %d\n",
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prec->xi0, prec->xi1, prec->yi0, prec->yi1);
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}
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}
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}
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}
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}
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}
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#endif
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/** decode the value stored in node */
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static int tag_tree_decode(J2kDecoderContext *s, J2kTgtNode *node, int threshold)
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{
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J2kTgtNode *stack[30];
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int sp = -1, curval = 0;
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while(node && !node->vis){
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stack[++sp] = node;
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node = node->parent;
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}
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if (node)
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curval = node->val;
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else
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curval = stack[sp]->val;
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while(curval < threshold && sp >= 0){
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if (curval < stack[sp]->val)
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curval = stack[sp]->val;
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while (curval < threshold){
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int ret;
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if ((ret = get_bits(s, 1)) > 0){
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stack[sp]->vis++;
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break;
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} else if (!ret)
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curval++;
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else
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return ret;
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}
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stack[sp]->val = curval;
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sp--;
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}
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return curval;
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}
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/* marker segments */
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/** get sizes and offsets of image, tiles; number of components */
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static int get_siz(J2kDecoderContext *s)
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{
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int i, ret;
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if (bytestream2_get_bytes_left(&s->g) < 36)
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return AVERROR(EINVAL);
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bytestream2_get_be16u(&s->g); // Rsiz (skipped)
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s->width = bytestream2_get_be32u(&s->g); // width
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s->height = bytestream2_get_be32u(&s->g); // height
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s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz
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s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz
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s->tile_width = bytestream2_get_be32u(&s->g); // XTSiz
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s->tile_height = bytestream2_get_be32u(&s->g); // YTSiz
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s->tile_offset_x = bytestream2_get_be32u(&s->g); // XT0Siz
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s->tile_offset_y = bytestream2_get_be32u(&s->g); // YT0Siz
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s->ncomponents = bytestream2_get_be16u(&s->g); // CSiz
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if(s->tile_width<=0 || s->tile_height<=0)
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return AVERROR(EINVAL);
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if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
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return AVERROR(EINVAL);
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for (i = 0; i < s->ncomponents; i++){ // Ssiz_i XRsiz_i, YRsiz_i
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uint8_t x = bytestream2_get_byteu(&s->g);
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s->cbps[i] = (x & 0x7f) + 1;
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s->precision = FFMAX(s->cbps[i], s->precision);
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s->sgnd[i] = !!(x & 0x80);
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s->cdx[i] = bytestream2_get_byteu(&s->g);
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s->cdy[i] = bytestream2_get_byteu(&s->g);
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}
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s->numXtiles = ff_j2k_ceildiv(s->width - s->tile_offset_x, s->tile_width);
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s->numYtiles = ff_j2k_ceildiv(s->height - s->tile_offset_y, s->tile_height);
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if(s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(J2kTile))
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return AVERROR(EINVAL);
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s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(J2kTile));
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if (!s->tile)
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return AVERROR(ENOMEM);
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for (i = 0; i < s->numXtiles * s->numYtiles; i++){
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J2kTile *tile = s->tile + i;
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tile->comp = av_mallocz(s->ncomponents * sizeof(J2kComponent));
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if (!tile->comp)
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return AVERROR(ENOMEM);
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}
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s->avctx->width = s->width - s->image_offset_x;
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s->avctx->height = s->height - s->image_offset_y;
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switch(s->ncomponents){
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case 1:
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if (s->precision > 8) {
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s->avctx->pix_fmt = PIX_FMT_GRAY16;
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} else {
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s->avctx->pix_fmt = PIX_FMT_GRAY8;
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}
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break;
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case 3:
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if (s->precision > 8) {
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s->avctx->pix_fmt = PIX_FMT_RGB48;
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} else {
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s->avctx->pix_fmt = PIX_FMT_RGB24;
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}
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break;
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case 4:
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s->avctx->pix_fmt = PIX_FMT_RGBA;
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break;
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}
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if (s->picture.data[0])
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s->avctx->release_buffer(s->avctx, &s->picture);
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if ((ret = s->avctx->get_buffer(s->avctx, &s->picture)) < 0)
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return ret;
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s->picture.pict_type = AV_PICTURE_TYPE_I;
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s->picture.key_frame = 1;
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return 0;
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}
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/** get common part for COD and COC segments */
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static int get_cox(J2kDecoderContext *s, J2kCodingStyle *c)
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{
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if (bytestream2_get_bytes_left(&s->g) < 5)
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return AVERROR(EINVAL);
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c->nreslevels = bytestream2_get_byteu(&s->g) + 1; // num of resolution levels - 1
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c->log2_cblk_width = bytestream2_get_byteu(&s->g) + 2; // cblk width
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c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height
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c->cblk_style = bytestream2_get_byteu(&s->g);
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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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}
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c->transform = bytestream2_get_byteu(&s->g); // transformation
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if (c->csty & J2K_CSTY_PREC) {
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int i;
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for (i = 0; i < c->nreslevels; i++)
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bytestream2_get_byte(&s->g);
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}
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return 0;
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}
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/** get coding parameters for a particular tile or whole image*/
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static int get_cod(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
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{
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J2kCodingStyle tmp;
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int compno;
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if (bytestream2_get_bytes_left(&s->g) < 5)
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return AVERROR(EINVAL);
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tmp.log2_prec_width =
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tmp.log2_prec_height = 15;
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tmp.csty = bytestream2_get_byteu(&s->g);
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if (bytestream2_get_byteu(&s->g)){ // progression level
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av_log(s->avctx, AV_LOG_ERROR, "only LRCP progression supported\n");
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return -1;
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}
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tmp.nlayers = bytestream2_get_be16u(&s->g);
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tmp.mct = bytestream2_get_byteu(&s->g); // multiple component transformation
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get_cox(s, &tmp);
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for (compno = 0; compno < s->ncomponents; compno++){
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if (!(properties[compno] & HAD_COC))
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memcpy(c + compno, &tmp, sizeof(J2kCodingStyle));
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}
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return 0;
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}
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/** get coding parameters for a component in the whole image on a particular tile */
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static int get_coc(J2kDecoderContext *s, J2kCodingStyle *c, uint8_t *properties)
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{
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int compno;
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if (bytestream2_get_bytes_left(&s->g) < 2)
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return AVERROR(EINVAL);
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compno = bytestream2_get_byteu(&s->g);
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c += compno;
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c->csty = bytestream2_get_byte(&s->g);
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get_cox(s, c);
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properties[compno] |= HAD_COC;
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return 0;
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}
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/** get common part for QCD and QCC segments */
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static int get_qcx(J2kDecoderContext *s, int n, J2kQuantStyle *q)
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{
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int i, x;
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if (bytestream2_get_bytes_left(&s->g) < 1)
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return AVERROR(EINVAL);
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x = bytestream2_get_byteu(&s->g); // Sqcd
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q->nguardbits = x >> 5;
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q->quantsty = x & 0x1f;
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if (q->quantsty == J2K_QSTY_NONE){
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n -= 3;
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if (bytestream2_get_bytes_left(&s->g) < n || 32*3 < n)
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return AVERROR(EINVAL);
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for (i = 0; i < n; i++)
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q->expn[i] = bytestream2_get_byteu(&s->g) >> 3;
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} else if (q->quantsty == J2K_QSTY_SI){
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if (bytestream2_get_bytes_left(&s->g) < 2)
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return AVERROR(EINVAL);
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x = bytestream2_get_be16u(&s->g);
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q->expn[0] = x >> 11;
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q->mant[0] = x & 0x7ff;
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for (i = 1; i < 32 * 3; i++){
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int curexpn = FFMAX(0, q->expn[0] - (i-1)/3);
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q->expn[i] = curexpn;
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q->mant[i] = q->mant[0];
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}
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} else{
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n = (n - 3) >> 1;
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if (bytestream2_get_bytes_left(&s->g) < 2 * n || 32*3 < n)
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return AVERROR(EINVAL);
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for (i = 0; i < n; i++){
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x = bytestream2_get_be16u(&s->g);
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q->expn[i] = x >> 11;
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q->mant[i] = x & 0x7ff;
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}
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}
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return 0;
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}
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/** get quantization parameters for a particular tile or a whole image */
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static int get_qcd(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
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{
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J2kQuantStyle tmp;
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int compno;
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if (get_qcx(s, n, &tmp))
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return -1;
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for (compno = 0; compno < s->ncomponents; compno++)
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if (!(properties[compno] & HAD_QCC))
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memcpy(q + compno, &tmp, sizeof(J2kQuantStyle));
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return 0;
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}
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/** get quantization parameters for a component in the whole image on in a particular tile */
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static int get_qcc(J2kDecoderContext *s, int n, J2kQuantStyle *q, uint8_t *properties)
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{
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int compno;
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if (bytestream2_get_bytes_left(&s->g) < 1)
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return AVERROR(EINVAL);
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compno = bytestream2_get_byteu(&s->g);
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properties[compno] |= HAD_QCC;
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return get_qcx(s, n-1, q+compno);
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}
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/** get start of tile segment */
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static uint8_t get_sot(J2kDecoderContext *s)
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{
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if (bytestream2_get_bytes_left(&s->g) < 8)
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return AVERROR(EINVAL);
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s->curtileno = bytestream2_get_be16u(&s->g); ///< Isot
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if((unsigned)s->curtileno >= s->numXtiles * s->numYtiles){
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s->curtileno=0;
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return AVERROR(EINVAL);
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}
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bytestream2_skipu(&s->g, 4); ///< Psot (ignored)
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if (!bytestream2_get_byteu(&s->g)){ ///< TPsot
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J2kTile *tile = s->tile + s->curtileno;
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/* copy defaults */
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memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(J2kCodingStyle));
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memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(J2kQuantStyle));
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}
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bytestream2_get_byteu(&s->g); ///< TNsot
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return 0;
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}
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static int init_tile(J2kDecoderContext *s, int tileno)
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{
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int compno,
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tilex = tileno % s->numXtiles,
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tiley = tileno / s->numXtiles;
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J2kTile *tile = s->tile + tileno;
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if (!tile->comp)
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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 (bytestream2_peek_be16(&s->g) == J2K_EPH) {
|
|
bytestream2_skip(&s->g, 2);
|
|
} else {
|
|
av_log(s->avctx, AV_LOG_ERROR, "EPH marker not found.\n");
|
|
}
|
|
}
|
|
|
|
for (bandno = 0; bandno < rlevel->nbands; bandno++){
|
|
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 (bytestream2_get_bytes_left(&s->g) < cblk->lengthinc)
|
|
return AVERROR(EINVAL);
|
|
bytestream2_get_bufferu(&s->g, 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->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 = (uint16_t *)(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 oldpos, marker, len, ret = 0;
|
|
|
|
if (bytestream2_get_bytes_left(&s->g) < 2){
|
|
av_log(s->avctx, AV_LOG_ERROR, "Missing EOC\n");
|
|
break;
|
|
}
|
|
|
|
marker = bytestream2_get_be16u(&s->g);
|
|
av_dlog(s->avctx, "marker 0x%.4X at pos 0x%x\n", marker, bytestream2_tell(&s->g) - 4);
|
|
oldpos = bytestream2_tell(&s->g);
|
|
|
|
if (marker == J2K_SOD){
|
|
J2kTile *tile = s->tile + s->curtileno;
|
|
if (ret = init_tile(s, s->curtileno)) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "tile initialization failed\n");
|
|
return ret;
|
|
}
|
|
if (ret = decode_packets(s, tile)) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "packets decoding failed\n");
|
|
return ret;
|
|
}
|
|
continue;
|
|
}
|
|
if (marker == J2K_EOC)
|
|
break;
|
|
|
|
if (bytestream2_get_bytes_left(&s->g) < 2)
|
|
return AVERROR(EINVAL);
|
|
len = bytestream2_get_be16u(&s->g);
|
|
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
|
|
bytestream2_skip(&s->g, len - 2);
|
|
break;
|
|
default:
|
|
av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4X at pos 0x%x\n", marker, bytestream2_tell(&s->g) - 4);
|
|
bytestream2_skip(&s->g, len - 2);
|
|
break;
|
|
}
|
|
if (bytestream2_tell(&s->g) - oldpos != 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, atom;
|
|
int found_codestream = 0, search_range = 10;
|
|
|
|
while(!found_codestream && search_range && bytestream2_get_bytes_left(&s->g) >= 8) {
|
|
atom_size = bytestream2_get_be32u(&s->g);
|
|
atom = bytestream2_get_be32u(&s->g);
|
|
if (atom == JP2_CODESTREAM) {
|
|
found_codestream = 1;
|
|
} else {
|
|
if (bytestream2_get_bytes_left(&s->g) < atom_size - 8)
|
|
return 0;
|
|
bytestream2_skipu(&s->g, atom_size - 8);
|
|
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;
|
|
bytestream2_init(&s->g, avpkt->data, avpkt->size);
|
|
s->curtileno = -1;
|
|
|
|
if (bytestream2_get_bytes_left(&s->g) < 2) {
|
|
ret = AVERROR(EINVAL);
|
|
goto err_out;
|
|
}
|
|
|
|
// check if the image is in jp2 format
|
|
if (bytestream2_get_bytes_left(&s->g) >= 12 &&
|
|
(bytestream2_get_be32u(&s->g) == 12) &&
|
|
(bytestream2_get_be32u(&s->g) == JP2_SIG_TYPE) &&
|
|
(bytestream2_get_be32u(&s->g) == JP2_SIG_VALUE)) {
|
|
if(!jp2_find_codestream(s)) {
|
|
av_log(avctx, AV_LOG_ERROR, "couldn't find jpeg2k codestream atom\n");
|
|
ret = -1;
|
|
goto err_out;
|
|
}
|
|
} else {
|
|
bytestream2_seek(&s->g, 0, SEEK_SET);
|
|
}
|
|
|
|
if (bytestream2_get_be16u(&s->g) != J2K_SOC){
|
|
av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
|
|
ret = -1;
|
|
goto err_out;
|
|
}
|
|
if (ret = decode_codestream(s))
|
|
goto err_out;
|
|
|
|
for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
|
|
if (ret = decode_tile(s, s->tile + tileno))
|
|
goto err_out;
|
|
|
|
cleanup(s);
|
|
|
|
*data_size = sizeof(AVPicture);
|
|
*picture = s->picture;
|
|
|
|
return bytestream2_tell(&s->g);
|
|
|
|
err_out:
|
|
cleanup(s);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
|
|
ff_j2k_init_tier1_luts();
|
|
|
|
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 = {
|
|
.name = "j2k",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_JPEG2000,
|
|
.priv_data_size = sizeof(J2kDecoderContext),
|
|
.init = j2kdec_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.capabilities = CODEC_CAP_EXPERIMENTAL,
|
|
.long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
|
|
};
|