/* * JPEG 2000 image decoder * Copyright (c) 2007 Kamil Nowosad * Copyright (c) 2013 Nicolas Bertrand * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * JPEG 2000 image decoder */ #include #include "libavutil/attributes.h" #include "libavutil/common.h" #include "libavutil/opt.h" #include "avcodec.h" #include "bytestream.h" #include "internal.h" #include "thread.h" #include "jpeg2000.h" #include "jpeg2000dsp.h" #include "profiles.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 Jpeg2000TilePart { uint8_t tile_index; // Tile index who refers the tile-part const uint8_t *tp_end; GetByteContext tpg; // bit stream in tile-part } Jpeg2000TilePart; /* RMK: For JPEG2000 DCINEMA 3 tile-parts in a tile * one per component, so tile_part elements have a size of 3 */ typedef struct Jpeg2000Tile { Jpeg2000Component *comp; uint8_t properties[4]; Jpeg2000CodingStyle codsty[4]; Jpeg2000QuantStyle qntsty[4]; Jpeg2000TilePart tile_part[3]; uint16_t tp_idx; // Tile-part index } Jpeg2000Tile; typedef struct Jpeg2000DecoderContext { AVClass *class; AVCodecContext *avctx; GetByteContext g; int width, 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; unsigned numXtiles, numYtiles; int maxtilelen; Jpeg2000CodingStyle codsty[4]; Jpeg2000QuantStyle qntsty[4]; int bit_index; int16_t curtileno; Jpeg2000Tile *tile; Jpeg2000DSPContext dsp; /*options parameters*/ int reduction_factor; } Jpeg2000DecoderContext; /* get_bits functions for JPEG2000 packet bitstream * It is a get_bit function with a bit-stuffing routine. If the value of the * byte is 0xFF, the next byte includes an extra zero bit stuffed into the MSB. * cf. ISO-15444-1:2002 / B.10.1 Bit-stuffing routine */ static int get_bits(Jpeg2000DecoderContext *s, int n) { int res = 0; while (--n >= 0) { res <<= 1; if (s->bit_index == 0) { s->bit_index = 7 + (bytestream2_get_byte(&s->g) != 0xFFu); } s->bit_index--; res |= (bytestream2_peek_byte(&s->g) >> s->bit_index) & 1; } return res; } static void jpeg2000_flush(Jpeg2000DecoderContext *s) { if (bytestream2_get_byte(&s->g) == 0xff) bytestream2_skip(&s->g, 1); s->bit_index = 8; } /* decode the value stored in node */ static int tag_tree_decode(Jpeg2000DecoderContext *s, Jpeg2000TgtNode *node, int threshold) { Jpeg2000TgtNode *stack[30]; int sp = -1, curval = 0; if (!node) return AVERROR_INVALIDDATA; 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(Jpeg2000DecoderContext *s) { int i; int ncomponents; if (bytestream2_get_bytes_left(&s->g) < 36) return AVERROR_INVALIDDATA; s->avctx->profile = bytestream2_get_be16u(&s->g); // Rsiz s->width = bytestream2_get_be32u(&s->g); // Width s->height = bytestream2_get_be32u(&s->g); // Height s->image_offset_x = bytestream2_get_be32u(&s->g); // X0Siz s->image_offset_y = bytestream2_get_be32u(&s->g); // Y0Siz s->tile_width = bytestream2_get_be32u(&s->g); // XTSiz s->tile_height = bytestream2_get_be32u(&s->g); // YTSiz s->tile_offset_x = bytestream2_get_be32u(&s->g); // XT0Siz s->tile_offset_y = bytestream2_get_be32u(&s->g); // YT0Siz ncomponents = bytestream2_get_be16u(&s->g); // CSiz if (ncomponents <= 0) { av_log(s->avctx, AV_LOG_ERROR, "Invalid number of components: %d\n", s->ncomponents); return AVERROR_INVALIDDATA; } if (ncomponents > 4) { avpriv_request_sample(s->avctx, "Support for %d components", s->ncomponents); return AVERROR_PATCHWELCOME; } s->ncomponents = ncomponents; if (s->tile_width <= 0 || s->tile_height <= 0 || s->tile_width > s->width || s->tile_height > s->height) { av_log(s->avctx, AV_LOG_ERROR, "Invalid tile dimension %dx%d.\n", s->tile_width, s->tile_height); return AVERROR_INVALIDDATA; } if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents) return AVERROR_INVALIDDATA; for (i = 0; i < s->ncomponents; i++) { // Ssiz_i XRsiz_i, YRsiz_i uint8_t x = bytestream2_get_byteu(&s->g); s->cbps[i] = (x & 0x7f) + 1; s->precision = FFMAX(s->cbps[i], s->precision); s->sgnd[i] = !!(x & 0x80); s->cdx[i] = bytestream2_get_byteu(&s->g); s->cdy[i] = bytestream2_get_byteu(&s->g); if (s->cdx[i] != 1 || s->cdy[i] != 1) { avpriv_request_sample(s->avctx, "CDxy values %d %d for component %d", s->cdx[i], s->cdy[i], i); if (!s->cdx[i] || !s->cdy[i]) return AVERROR_INVALIDDATA; else return AVERROR_PATCHWELCOME; } } s->numXtiles = ff_jpeg2000_ceildiv(s->width - s->tile_offset_x, s->tile_width); s->numYtiles = ff_jpeg2000_ceildiv(s->height - s->tile_offset_y, s->tile_height); s->tile = av_mallocz_array(s->numXtiles * s->numYtiles, sizeof(*s->tile)); if (!s->tile) { s->numXtiles = s->numYtiles = 0; return AVERROR(ENOMEM); } for (i = 0; i < s->numXtiles * s->numYtiles; i++) { Jpeg2000Tile *tile = s->tile + i; tile->comp = av_mallocz(s->ncomponents * sizeof(*tile->comp)); if (!tile->comp) return AVERROR(ENOMEM); } /* compute image size with reduction factor */ s->avctx->width = ff_jpeg2000_ceildivpow2(s->width - s->image_offset_x, s->reduction_factor); s->avctx->height = ff_jpeg2000_ceildivpow2(s->height - s->image_offset_y, s->reduction_factor); switch (s->ncomponents) { case 1: if (s->precision > 8) s->avctx->pix_fmt = AV_PIX_FMT_GRAY16; else s->avctx->pix_fmt = AV_PIX_FMT_GRAY8; break; case 3: switch (s->avctx->profile) { case FF_PROFILE_JPEG2000_DCINEMA_2K: case FF_PROFILE_JPEG2000_DCINEMA_4K: /* XYZ color-space for digital cinema profiles */ s->avctx->pix_fmt = AV_PIX_FMT_XYZ12; break; default: if (s->precision > 8) s->avctx->pix_fmt = AV_PIX_FMT_RGB48; else s->avctx->pix_fmt = AV_PIX_FMT_RGB24; break; } break; case 4: s->avctx->pix_fmt = AV_PIX_FMT_RGBA; break; default: /* pixel format can not be identified */ s->avctx->pix_fmt = AV_PIX_FMT_NONE; break; } return 0; } /* get common part for COD and COC segments */ static int get_cox(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c) { uint8_t byte; if (bytestream2_get_bytes_left(&s->g) < 5) return AVERROR_INVALIDDATA; /* nreslevels = number of resolution levels = number of decomposition level +1 */ c->nreslevels = bytestream2_get_byteu(&s->g) + 1; if (c->nreslevels > JPEG2000_MAX_RESLEVELS) return AVERROR_INVALIDDATA; /* compute number of resolution levels to decode */ if (c->nreslevels < s->reduction_factor) c->nreslevels2decode = 1; else c->nreslevels2decode = c->nreslevels - s->reduction_factor; c->log2_cblk_width = bytestream2_get_byteu(&s->g) + 2; // cblk width c->log2_cblk_height = bytestream2_get_byteu(&s->g) + 2; // cblk height if (c->log2_cblk_width > 10 || c->log2_cblk_height > 10 || c->log2_cblk_width + c->log2_cblk_height > 12) { av_log(s->avctx, AV_LOG_ERROR, "cblk size invalid\n"); return AVERROR_INVALIDDATA; } c->cblk_style = bytestream2_get_byteu(&s->g); if (c->cblk_style != 0) { // cblk style avpriv_request_sample(s->avctx, "Support for extra cblk styles"); return AVERROR_PATCHWELCOME; } c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type /* set integer 9/7 DWT in case of BITEXACT flag */ if ((s->avctx->flags & AV_CODEC_FLAG_BITEXACT) && (c->transform == FF_DWT97)) c->transform = FF_DWT97_INT; if (c->csty & JPEG2000_CSTY_PREC) { int i; for (i = 0; i < c->nreslevels; i++) { byte = bytestream2_get_byte(&s->g); c->log2_prec_widths[i] = byte & 0x0F; // precinct PPx c->log2_prec_heights[i] = (byte >> 4) & 0x0F; // precinct PPy } } else { memset(c->log2_prec_widths , 15, sizeof(c->log2_prec_widths )); memset(c->log2_prec_heights, 15, sizeof(c->log2_prec_heights)); } return 0; } /* get coding parameters for a particular tile or whole image*/ static int get_cod(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c, uint8_t *properties) { Jpeg2000CodingStyle tmp; int compno, ret; if (bytestream2_get_bytes_left(&s->g) < 5) return AVERROR_INVALIDDATA; tmp.csty = bytestream2_get_byteu(&s->g); // get progression order tmp.prog_order = bytestream2_get_byteu(&s->g); tmp.nlayers = bytestream2_get_be16u(&s->g); tmp.mct = bytestream2_get_byteu(&s->g); // multiple component transformation if (tmp.mct && s->ncomponents < 3) { av_log(s->avctx, AV_LOG_ERROR, "MCT %"PRIu8" with too few components (%d)\n", tmp.mct, s->ncomponents); return AVERROR_INVALIDDATA; } if ((ret = get_cox(s, &tmp)) < 0) return ret; for (compno = 0; compno < s->ncomponents; compno++) if (!(properties[compno] & HAD_COC)) memcpy(c + compno, &tmp, sizeof(tmp)); return 0; } /* Get coding parameters for a component in the whole image or a * particular tile. */ static int get_coc(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *c, uint8_t *properties) { int compno, ret; if (bytestream2_get_bytes_left(&s->g) < 2) return AVERROR_INVALIDDATA; compno = bytestream2_get_byteu(&s->g); if (compno >= s->ncomponents) { av_log(s->avctx, AV_LOG_ERROR, "Invalid compno %d. There are %d components in the image.\n", compno, s->ncomponents); return AVERROR_INVALIDDATA; } c += compno; c->csty = bytestream2_get_byteu(&s->g); if ((ret = get_cox(s, c)) < 0) return ret; properties[compno] |= HAD_COC; return 0; } /* Get common part for QCD and QCC segments. */ static int get_qcx(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q) { int i, x; if (bytestream2_get_bytes_left(&s->g) < 1) return AVERROR_INVALIDDATA; x = bytestream2_get_byteu(&s->g); // Sqcd q->nguardbits = x >> 5; q->quantsty = x & 0x1f; if (q->quantsty == JPEG2000_QSTY_NONE) { n -= 3; if (bytestream2_get_bytes_left(&s->g) < n || n > JPEG2000_MAX_DECLEVELS) return AVERROR_INVALIDDATA; for (i = 0; i < n; i++) q->expn[i] = bytestream2_get_byteu(&s->g) >> 3; } else if (q->quantsty == JPEG2000_QSTY_SI) { if (bytestream2_get_bytes_left(&s->g) < 2) return AVERROR_INVALIDDATA; x = bytestream2_get_be16u(&s->g); q->expn[0] = x >> 11; q->mant[0] = x & 0x7ff; for (i = 1; i < JPEG2000_MAX_DECLEVELS * 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 (bytestream2_get_bytes_left(&s->g) < 2 * n || n > JPEG2000_MAX_DECLEVELS) return AVERROR_INVALIDDATA; for (i = 0; i < n; i++) { x = bytestream2_get_be16u(&s->g); 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(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q, uint8_t *properties) { Jpeg2000QuantStyle tmp; int compno, ret; if ((ret = get_qcx(s, n, &tmp)) < 0) return ret; for (compno = 0; compno < s->ncomponents; compno++) if (!(properties[compno] & HAD_QCC)) memcpy(q + compno, &tmp, sizeof(tmp)); return 0; } /* Get quantization parameters for a component in the whole image * on in a particular tile. */ static int get_qcc(Jpeg2000DecoderContext *s, int n, Jpeg2000QuantStyle *q, uint8_t *properties) { int compno; if (bytestream2_get_bytes_left(&s->g) < 1) return AVERROR_INVALIDDATA; compno = bytestream2_get_byteu(&s->g); if (compno >= s->ncomponents) { av_log(s->avctx, AV_LOG_ERROR, "Invalid compno %d. There are %d components in the image.\n", compno, s->ncomponents); return AVERROR_INVALIDDATA; } properties[compno] |= HAD_QCC; return get_qcx(s, n - 1, q + compno); } /* Get start of tile segment. */ static int get_sot(Jpeg2000DecoderContext *s, int n) { Jpeg2000TilePart *tp; uint16_t Isot; uint32_t Psot; uint8_t TPsot; if (bytestream2_get_bytes_left(&s->g) < 8) return AVERROR_INVALIDDATA; Isot = bytestream2_get_be16u(&s->g); // Isot if (Isot >= s->numXtiles * s->numYtiles) return AVERROR_INVALIDDATA; if (Isot) { avpriv_request_sample(s->avctx, "Support for more than one tile"); return AVERROR_PATCHWELCOME; } Psot = bytestream2_get_be32u(&s->g); // Psot TPsot = bytestream2_get_byteu(&s->g); // TPsot /* Read TNSot but not used */ bytestream2_get_byteu(&s->g); // TNsot if (Psot > bytestream2_get_bytes_left(&s->g) + n + 2) { av_log(s->avctx, AV_LOG_ERROR, "Psot %"PRIu32" too big\n", Psot); return AVERROR_INVALIDDATA; } if (TPsot >= FF_ARRAY_ELEMS(s->tile[Isot].tile_part)) { avpriv_request_sample(s->avctx, "Support for %"PRIu8" components", TPsot); return AVERROR_PATCHWELCOME; } s->tile[Isot].tp_idx = TPsot; tp = s->tile[Isot].tile_part + TPsot; tp->tile_index = Isot; tp->tp_end = s->g.buffer + Psot - n - 2; if (!TPsot) { Jpeg2000Tile *tile = s->tile + s->curtileno; /* copy defaults */ memcpy(tile->codsty, s->codsty, s->ncomponents * sizeof(Jpeg2000CodingStyle)); memcpy(tile->qntsty, s->qntsty, s->ncomponents * sizeof(Jpeg2000QuantStyle)); } return 0; } /* Tile-part lengths: see ISO 15444-1:2002, section A.7.1 * Used to know the number of tile parts and lengths. * There may be multiple TLMs in the header. * TODO: The function is not used for tile-parts management, nor anywhere else. * It can be useful to allocate memory for tile parts, before managing the SOT * markers. Parsing the TLM header is needed to increment the input header * buffer. * This marker is mandatory for DCI. */ static uint8_t get_tlm(Jpeg2000DecoderContext *s, int n) { uint8_t Stlm, ST, SP, tile_tlm, i; bytestream2_get_byte(&s->g); /* Ztlm: skipped */ Stlm = bytestream2_get_byte(&s->g); // too complex ? ST = ((Stlm >> 4) & 0x01) + ((Stlm >> 4) & 0x02); ST = (Stlm >> 4) & 0x03; // TODO: Manage case of ST = 0b11 --> raise error SP = (Stlm >> 6) & 0x01; tile_tlm = (n - 4) / ((SP + 1) * 2 + ST); for (i = 0; i < tile_tlm; i++) { switch (ST) { case 0: break; case 1: bytestream2_get_byte(&s->g); break; case 2: bytestream2_get_be16(&s->g); break; case 3: bytestream2_get_be32(&s->g); break; } if (SP == 0) { bytestream2_get_be16(&s->g); } else { bytestream2_get_be32(&s->g); } } return 0; } static int init_tile(Jpeg2000DecoderContext *s, int tileno) { int compno; int tilex = tileno % s->numXtiles; int tiley = tileno / s->numXtiles; Jpeg2000Tile *tile = s->tile + tileno; if (!tile->comp) return AVERROR(ENOMEM); for (compno = 0; compno < s->ncomponents; compno++) { Jpeg2000Component *comp = tile->comp + compno; Jpeg2000CodingStyle *codsty = tile->codsty + compno; Jpeg2000QuantStyle *qntsty = tile->qntsty + compno; int ret; // global bandno comp->coord_o[0][0] = FFMAX(tilex * s->tile_width + s->tile_offset_x, s->image_offset_x); comp->coord_o[0][1] = FFMIN((tilex + 1) * s->tile_width + s->tile_offset_x, s->width); comp->coord_o[1][0] = FFMAX(tiley * s->tile_height + s->tile_offset_y, s->image_offset_y); comp->coord_o[1][1] = FFMIN((tiley + 1) * s->tile_height + s->tile_offset_y, s->height); comp->coord[0][0] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][0], s->reduction_factor); comp->coord[0][1] = ff_jpeg2000_ceildivpow2(comp->coord_o[0][1], s->reduction_factor); comp->coord[1][0] = ff_jpeg2000_ceildivpow2(comp->coord_o[1][0], s->reduction_factor); comp->coord[1][1] = ff_jpeg2000_ceildivpow2(comp->coord_o[1][1], s->reduction_factor); if (ret = ff_jpeg2000_init_component(comp, codsty, qntsty, s->cbps[compno], s->cdx[compno], s->cdy[compno], s->avctx)) return ret; } return 0; } /* Read the number of coding passes. */ static int getnpasses(Jpeg2000DecoderContext *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(Jpeg2000DecoderContext *s) { int res = 0, ret; while (ret = get_bits(s, 1)) { if (ret < 0) return ret; res++; } return res; } static int jpeg2000_decode_packet(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, Jpeg2000ResLevel *rlevel, int precno, int layno, uint8_t *expn, int numgbits) { int bandno, cblkno, ret, nb_code_blocks; if (!(ret = get_bits(s, 1))) { jpeg2000_flush(s); return 0; } else if (ret < 0) return ret; for (bandno = 0; bandno < rlevel->nbands; bandno++) { Jpeg2000Band *band = rlevel->band + bandno; Jpeg2000Prec *prec = band->prec + precno; if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1]) continue; nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width; for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) { Jpeg2000Cblk *cblk = prec->cblk + cblkno; int incl, newpasses, llen; if (cblk->npasses) incl = get_bits(s, 1); else incl = tag_tree_decode(s, prec->cblkincl + cblkno, layno + 1) == layno; if (!incl) continue; else if (incl < 0) return incl; if (!cblk->npasses) { int v = expn[bandno] + numgbits - 1 - tag_tree_decode(s, prec->zerobits + cblkno, 100); if (v < 0) { av_log(s->avctx, AV_LOG_ERROR, "nonzerobits %d invalid\n", v); return AVERROR_INVALIDDATA; } cblk->nonzerobits = v; } 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; if (ret > sizeof(cblk->data)) { avpriv_request_sample(s->avctx, "Block with lengthinc greater than %zu", sizeof(cblk->data)); return AVERROR_PATCHWELCOME; } cblk->lengthinc = ret; cblk->npasses += newpasses; } } jpeg2000_flush(s); if (codsty->csty & JPEG2000_CSTY_EPH) { if (bytestream2_peek_be16(&s->g) == JPEG2000_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++) { Jpeg2000Band *band = rlevel->band + bandno; Jpeg2000Prec *prec = band->prec + precno; nb_code_blocks = prec->nb_codeblocks_height * prec->nb_codeblocks_width; for (cblkno = 0; cblkno < nb_code_blocks; cblkno++) { Jpeg2000Cblk *cblk = prec->cblk + cblkno; if (bytestream2_get_bytes_left(&s->g) < cblk->lengthinc) return AVERROR_INVALIDDATA; /* Code-block data can be empty. In that case initialize data * with 0xFFFF. */ if (cblk->lengthinc > 0) { bytestream2_get_bufferu(&s->g, cblk->data, cblk->lengthinc); } else { cblk->data[0] = 0xFF; cblk->data[1] = 0xFF; } cblk->length += cblk->lengthinc; cblk->lengthinc = 0; if (cblk->length > sizeof(cblk->data)) { av_log(s->avctx, AV_LOG_ERROR, "Block length %"PRIu16" > data size %zd\n", cblk->length, sizeof(cblk->data)); return AVERROR_INVALIDDATA; } } } return 0; } static int decode_pgod_lrcp(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile) { int layno, reslevelno, compno, precno, ok_reslevel; int ret; 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++) { Jpeg2000CodingStyle *codsty = tile->codsty + compno; Jpeg2000QuantStyle *qntsty = tile->qntsty + compno; if (reslevelno < codsty->nreslevels) { Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno; ok_reslevel = 1; for (precno = 0; precno < rlevel->num_precincts_x * rlevel->num_precincts_y; precno++) if ((ret = jpeg2000_decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0), qntsty->nguardbits)) < 0) return ret; } } } } return 0; } static int decode_pgod_cprl(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile) { int layno, reslevelno, compno, precno; int ret, x, y; for (compno = 0; compno < s->ncomponents; compno++) { Jpeg2000CodingStyle *codsty = tile->codsty + compno; Jpeg2000QuantStyle *qntsty = tile->qntsty + compno; /* Set bit stream buffer address according to tile-part. * For DCinema one tile-part per component, so can be * indexed by component. */ s->g = tile->tile_part[compno].tpg; /* Position loop (y axis) * TODO: Automate computing of step 256. * Fixed here, but to be computed before entering here. */ for (y = 0; y < s->height; y += 256) { /* Position loop (y axis) * TODO: automate computing of step 256. * Fixed here, but to be computed before entering here. */ for (x = 0; x < s->width; x += 256) { for (reslevelno = 0; reslevelno < codsty->nreslevels; reslevelno++) { uint16_t prcx, prcy; uint8_t reducedresno = codsty->nreslevels - 1 -reslevelno; // ==> N_L - r Jpeg2000ResLevel *rlevel = tile->comp[compno].reslevel + reslevelno; if (!((y % (1 << (rlevel->log2_prec_height + reducedresno)) == 0) || (y == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema continue; if (!((x % (1 << (rlevel->log2_prec_width + reducedresno)) == 0) || (x == 0))) // TODO: 2nd condition simplified as try0 always =0 for dcinema continue; // check if a precinct exists prcx = ff_jpeg2000_ceildivpow2(x, reducedresno) >> rlevel->log2_prec_width; prcy = ff_jpeg2000_ceildivpow2(y, reducedresno) >> rlevel->log2_prec_height; precno = prcx + rlevel->num_precincts_x * prcy; for (layno = 0; layno < tile->codsty[0].nlayers; layno++) { if ((ret = jpeg2000_decode_packet(s, codsty, rlevel, precno, layno, qntsty->expn + (reslevelno ? 3 * (reslevelno - 1) + 1 : 0), qntsty->nguardbits)) < 0) return ret; } } } } } return 0; } static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile) { int ret = 0; s->bit_index = 8; switch (tile->codsty[0].prog_order) { case JPEG2000_PGOD_LRCP: ret = decode_pgod_lrcp(s, tile); break; case JPEG2000_PGOD_CPRL: ret = decode_pgod_cprl(s, tile); break; case JPEG2000_PGOD_RLCP: avpriv_request_sample(s->avctx, "Progression order RLCP"); ret = AVERROR_PATCHWELCOME; break; case JPEG2000_PGOD_RPCL: avpriv_request_sample(s->avctx, "Progression order RPCL"); ret = AVERROR_PATCHWELCOME; break; case JPEG2000_PGOD_PCRL: avpriv_request_sample(s->avctx, "Progression order PCRL"); ret = AVERROR_PATCHWELCOME; break; default: break; } /* EOC marker reached */ bytestream2_skip(&s->g, 2); return ret; } /* TIER-1 routines */ static void decode_sigpass(Jpeg2000T1Context *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] & JPEG2000_T1_SIG_NB) && !(t1->flags[y+1][x+1] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) { int flags_mask = -1; if (vert_causal_ctx_csty_symbol && y == y0 + 3) flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE); if (ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask, bandno))) { int xorbit, ctxno = ff_jpeg2000_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_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0); } t1->flags[y + 1][x + 1] |= JPEG2000_T1_VIS; } } } static void decode_refpass(Jpeg2000T1Context *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] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS)) == JPEG2000_T1_SIG) { int ctxno = ff_jpeg2000_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] |= JPEG2000_T1_REF; } } static void decode_clnpass(Jpeg2000DecoderContext *s, Jpeg2000T1Context *t1, int width, int height, int bpno, int bandno, int seg_symbols, int vert_causal_ctx_csty_symbol) { 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] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) || (t1->flags[y0 + 2][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) || (t1->flags[y0 + 3][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_T1_SIG)) || (t1->flags[y0 + 4][x + 1] & (JPEG2000_T1_SIG_NB | JPEG2000_T1_VIS | JPEG2000_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] & (JPEG2000_T1_SIG | JPEG2000_T1_VIS))) { int flags_mask = -1; if (vert_causal_ctx_csty_symbol && y == y0 + 3) flags_mask &= ~(JPEG2000_T1_SIG_S | JPEG2000_T1_SIG_SW | JPEG2000_T1_SIG_SE); dec = ff_mqc_decode(&t1->mqc, t1->mqc.cx_states + ff_jpeg2000_getsigctxno(t1->flags[y+1][x+1] & flags_mask, bandno)); } } if (dec) { int xorbit; int ctxno = ff_jpeg2000_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_jpeg2000_set_significance(t1, x, y, t1->data[y][x] < 0); } dec = 0; t1->flags[y + 1][x + 1] &= ~JPEG2000_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(Jpeg2000DecoderContext *s, Jpeg2000CodingStyle *codsty, Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk, int width, int height, int bandpos) { int passno = cblk->npasses, pass_t = 2, bpno = cblk->nonzerobits - 1, y; int clnpass_cnt = 0; int bpass_csty_symbol = codsty->cblk_style & JPEG2000_CBLK_BYPASS; int vert_causal_ctx_csty_symbol = codsty->cblk_style & JPEG2000_CBLK_VSC; for (y = 0; y < height; y++) memset(t1->data[y], 0, width * sizeof(**t1->data)); /* If code-block contains no compressed data: nothing to do. */ if (!cblk->length) return 0; for (y = 0; y < height + 2; y++) memset(t1->flags[y], 0, (width + 2) * sizeof(**t1->flags)); ff_mqc_initdec(&t1->mqc, cblk->data); cblk->data[cblk->length] = 0xff; cblk->data[cblk->length + 1] = 0xff; while (passno--) { switch (pass_t) { case 0: decode_sigpass(t1, width, height, bpno + 1, bandpos, 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 & JPEG2000_CBLK_SEGSYM, vert_causal_ctx_csty_symbol); 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; } /* TODO: Verify dequantization for lossless case * comp->data can be float or int * band->stepsize can be float or int * depending on the type of DWT transformation. * see ISO/IEC 15444-1:2002 A.6.1 */ /* Float dequantization of a codeblock.*/ static void dequantization_float(int x, int y, Jpeg2000Cblk *cblk, Jpeg2000Component *comp, Jpeg2000T1Context *t1, Jpeg2000Band *band) { int i, j; int w = cblk->coord[0][1] - cblk->coord[0][0]; for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) { float *datap = &comp->f_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x]; int *src = t1->data[j]; for (i = 0; i < w; ++i) datap[i] = src[i] * band->f_stepsize; } } /* Integer dequantization of a codeblock.*/ static void dequantization_int(int x, int y, Jpeg2000Cblk *cblk, Jpeg2000Component *comp, Jpeg2000T1Context *t1, Jpeg2000Band *band) { int i, j; int w = cblk->coord[0][1] - cblk->coord[0][0]; for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j) { int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x]; int *src = t1->data[j]; for (i = 0; i < w; ++i) datap[i] = (src[i] * band->i_stepsize + (1 << 15)) >> 16; } } static inline void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile) { int i, csize = 1; void *src[3]; for (i = 0; i < 3; i++) if (tile->codsty[0].transform == FF_DWT97) src[i] = tile->comp[i].f_data; else src[i] = tile->comp[i].i_data; for (i = 0; i < 2; i++) csize *= tile->comp[0].coord[i][1] - tile->comp[0].coord[i][0]; s->dsp.mct_decode[tile->codsty[0].transform](src[0], src[1], src[2], csize); } static inline void tile_codeblocks(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile) { Jpeg2000T1Context t1; int compno, reslevelno, bandno; /* Loop on tile components */ for (compno = 0; compno < s->ncomponents; compno++) { Jpeg2000Component *comp = tile->comp + compno; Jpeg2000CodingStyle *codsty = tile->codsty + compno; /* Loop on resolution levels */ for (reslevelno = 0; reslevelno < codsty->nreslevels2decode; reslevelno++) { Jpeg2000ResLevel *rlevel = comp->reslevel + reslevelno; /* Loop on bands */ for (bandno = 0; bandno < rlevel->nbands; bandno++) { uint16_t nb_precincts, precno; Jpeg2000Band *band = rlevel->band + bandno; int cblkno = 0, bandpos; bandpos = bandno + (reslevelno > 0); if (band->coord[0][0] == band->coord[0][1] || band->coord[1][0] == band->coord[1][1]) continue; nb_precincts = rlevel->num_precincts_x * rlevel->num_precincts_y; /* Loop on precincts */ for (precno = 0; precno < nb_precincts; precno++) { Jpeg2000Prec *prec = band->prec + precno; /* Loop on codeblocks */ for (cblkno = 0; cblkno < prec->nb_codeblocks_width * prec->nb_codeblocks_height; cblkno++) { int x, y; Jpeg2000Cblk *cblk = prec->cblk + cblkno; decode_cblk(s, codsty, &t1, cblk, cblk->coord[0][1] - cblk->coord[0][0], cblk->coord[1][1] - cblk->coord[1][0], bandpos); x = cblk->coord[0][0]; y = cblk->coord[1][0]; if (codsty->transform == FF_DWT97) dequantization_float(x, y, cblk, comp, &t1, band); else dequantization_int(x, y, cblk, comp, &t1, band); } /* end cblk */ } /*end prec */ } /* end band */ } /* end reslevel */ /* inverse DWT */ ff_dwt_decode(&comp->dwt, codsty->transform == FF_DWT97 ? (void*)comp->f_data : (void*)comp->i_data); } /*end comp */ } #define WRITE_FRAME(D, PIXEL) \ static inline void write_frame_ ## D(Jpeg2000DecoderContext * s, Jpeg2000Tile * tile, \ AVFrame * picture) \ { \ int linesize = picture->linesize[0] / sizeof(PIXEL); \ int compno; \ int x, y; \ \ for (compno = 0; compno < s->ncomponents; compno++) { \ Jpeg2000Component *comp = tile->comp + compno; \ Jpeg2000CodingStyle *codsty = tile->codsty + compno; \ PIXEL *line; \ float *datap = comp->f_data; \ int32_t *i_datap = comp->i_data; \ int cbps = s->cbps[compno]; \ int w = tile->comp[compno].coord[0][1] - s->image_offset_x; \ \ y = tile->comp[compno].coord[1][0] - s->image_offset_y; \ line = (PIXEL *)picture->data[0] + y * linesize; \ for (; y < tile->comp[compno].coord[1][1] - s->image_offset_y; y += s->cdy[compno]) { \ PIXEL *dst; \ \ x = tile->comp[compno].coord[0][0] - s->image_offset_x; \ dst = line + x * s->ncomponents + compno; \ \ if (codsty->transform == FF_DWT97) { \ for (; x < w; x += s->cdx[compno]) { \ int val = lrintf(*datap) + (1 << (cbps - 1)); \ /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */ \ val = av_clip(val, 0, (1 << cbps) - 1); \ *dst = val << (8 * sizeof(PIXEL) - cbps); \ datap++; \ dst += s->ncomponents; \ } \ } else { \ for (; x < w; x += s->cdx[compno]) { \ int val = *i_datap + (1 << (cbps - 1)); \ /* DC level shift and clip see ISO 15444-1:2002 G.1.2 */ \ val = av_clip(val, 0, (1 << cbps) - 1); \ *dst = val << (8 * sizeof(PIXEL) - cbps); \ i_datap++; \ dst += s->ncomponents; \ } \ } \ line += linesize; \ } \ } \ \ } WRITE_FRAME(8, uint8_t) WRITE_FRAME(16, uint16_t) #undef WRITE_FRAME static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile, AVFrame *picture) { tile_codeblocks(s, tile); /* inverse MCT transformation */ if (tile->codsty[0].mct) mct_decode(s, tile); if (s->precision <= 8) { write_frame_8(s, tile, picture); } else { write_frame_16(s, tile, picture); } return 0; } static void jpeg2000_dec_cleanup(Jpeg2000DecoderContext *s) { int tileno, compno; for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) { for (compno = 0; compno < s->ncomponents; compno++) { Jpeg2000Component *comp = s->tile[tileno].comp + compno; Jpeg2000CodingStyle *codsty = s->tile[tileno].codsty + compno; ff_jpeg2000_cleanup(comp, codsty); } av_freep(&s->tile[tileno].comp); } av_freep(&s->tile); s->numXtiles = s->numYtiles = 0; } static int jpeg2000_read_main_headers(Jpeg2000DecoderContext *s) { Jpeg2000CodingStyle *codsty = s->codsty; Jpeg2000QuantStyle *qntsty = s->qntsty; uint8_t *properties = s->properties; for (;;) { int len, ret = 0; uint16_t marker; int oldpos; 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); oldpos = bytestream2_tell(&s->g); if (marker == JPEG2000_SOD) { Jpeg2000Tile *tile; Jpeg2000TilePart *tp; if (s->curtileno < 0) { av_log(s->avctx, AV_LOG_ERROR, "Missing SOT\n"); return AVERROR_INVALIDDATA; } if (!s->tile) { av_log(s->avctx, AV_LOG_ERROR, "Missing SIZ\n"); return AVERROR_INVALIDDATA; } tile = s->tile + s->curtileno; tp = tile->tile_part + tile->tp_idx; bytestream2_init(&tp->tpg, s->g.buffer, tp->tp_end - s->g.buffer); bytestream2_skip(&s->g, tp->tp_end - s->g.buffer); continue; } if (marker == JPEG2000_EOC) break; len = bytestream2_get_be16u(&s->g); if (len < 2 || bytestream2_get_bytes_left(&s->g) < len - 2) return AVERROR_INVALIDDATA; switch (marker) { case JPEG2000_SIZ: ret = get_siz(s); break; case JPEG2000_COC: ret = get_coc(s, codsty, properties); break; case JPEG2000_COD: ret = get_cod(s, codsty, properties); break; case JPEG2000_QCC: ret = get_qcc(s, len, qntsty, properties); break; case JPEG2000_QCD: ret = get_qcd(s, len, qntsty, properties); break; case JPEG2000_SOT: if (!(ret = get_sot(s, len))) { codsty = s->tile[s->curtileno].codsty; qntsty = s->tile[s->curtileno].qntsty; properties = s->tile[s->curtileno].properties; } break; case JPEG2000_PLT: // the PLT marker is ignored case JPEG2000_PLM: // the PLM marker is ignored case JPEG2000_COM: // the comment is ignored bytestream2_skip(&s->g, len - 2); break; case JPEG2000_TLM: // Tile-part lengths ret = get_tlm(s, len); break; default: av_log(s->avctx, AV_LOG_ERROR, "unsupported marker 0x%.4"PRIX16" 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 %.4"PRIx16"\n", marker); return ret ? ret : -1; } } return 0; } /* Read bit stream packets --> T2 operation. */ static int jpeg2000_read_bitstream_packets(Jpeg2000DecoderContext *s) { int ret = 0; int tileno; for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) { Jpeg2000Tile *tile = s->tile + tileno; if (ret = init_tile(s, tileno)) return ret; s->g = tile->tile_part[0].tpg; if (ret = jpeg2000_decode_packets(s, tile)) return ret; } return 0; } static int jp2_find_codestream(Jpeg2000DecoderContext *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 av_cold int jpeg2000_decode_init(AVCodecContext *avctx) { Jpeg2000DecoderContext *s = avctx->priv_data; ff_jpeg2000dsp_init(&s->dsp); return 0; } static int jpeg2000_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) { Jpeg2000DecoderContext *s = avctx->priv_data; ThreadFrame frame = { .f = data }; AVFrame *picture = data; int tileno, ret; s->avctx = avctx; bytestream2_init(&s->g, avpkt->data, avpkt->size); s->curtileno = 0; // TODO: only one tile in DCI JP2K. to implement for more tiles if (bytestream2_get_bytes_left(&s->g) < 2) { ret = AVERROR_INVALIDDATA; goto end; } // 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, "Could not find Jpeg2000 codestream atom.\n"); ret = AVERROR_INVALIDDATA; goto end; } } else { bytestream2_seek(&s->g, 0, SEEK_SET); } if (bytestream2_get_be16u(&s->g) != JPEG2000_SOC) { av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n"); ret = AVERROR_INVALIDDATA; goto end; } if (ret = jpeg2000_read_main_headers(s)) goto end; /* get picture buffer */ if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0) { av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed.\n"); goto end; } picture->pict_type = AV_PICTURE_TYPE_I; picture->key_frame = 1; if (ret = jpeg2000_read_bitstream_packets(s)) goto end; for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++) if (ret = jpeg2000_decode_tile(s, s->tile + tileno, picture)) goto end; jpeg2000_dec_cleanup(s); *got_frame = 1; return bytestream2_tell(&s->g); end: jpeg2000_dec_cleanup(s); return ret; } static av_cold void jpeg2000_init_static_data(AVCodec *codec) { ff_jpeg2000_init_tier1_luts(); ff_mqc_init_context_tables(); } #define OFFSET(x) offsetof(Jpeg2000DecoderContext, x) #define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM static const AVOption options[] = { { "lowres", "Lower the decoding resolution by a power of two", OFFSET(reduction_factor), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD }, { NULL }, }; static const AVClass class = { .class_name = "jpeg2000", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; AVCodec ff_jpeg2000_decoder = { .name = "jpeg2000", .long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"), .type = AVMEDIA_TYPE_VIDEO, .id = AV_CODEC_ID_JPEG2000, .capabilities = AV_CODEC_CAP_FRAME_THREADS | AV_CODEC_CAP_DR1, .priv_data_size = sizeof(Jpeg2000DecoderContext), .init_static_data = jpeg2000_init_static_data, .init = jpeg2000_decode_init, .decode = jpeg2000_decode_frame, .priv_class = &class, .profiles = NULL_IF_CONFIG_SMALL(ff_jpeg2000_profiles) };