/* * 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]; const uint8_t *buf_start; const uint8_t *buf; const 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->tile_width<=0 || s->tile_height<=0) return AVERROR(EINVAL); 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); 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); if(s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(J2kTile)) return AVERROR(EINVAL); 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 || 32*3 < 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 || 32*3 < 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 if((unsigned)s->curtileno >= s->numXtiles * s->numYtiles){ s->curtileno=0; return AVERROR(EINVAL); } 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; const 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); if(s->avctx->debug & FF_DEBUG_STARTCODE) av_log(s->avctx, AV_LOG_DEBUG, "marker 0x%.4X at pos 0x%x\n", marker, s->buf - s->buf_start - 4); 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} };