generic-library/ffmpeg
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
f471b5fa30
ffmpeg/libavcodec/j2kdec.c
Michael Niedermayer f471b5fa30 j2k: restructure bitstream decoding 
This is based on jpeg2000 but differs because of
problems with the design from jpeg2000 with currently
supported files

More files can be decoded after this commit, though they
show heavy artifacts

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-05-31 03:09:32 +02:00

1340 lines
46 KiB
C
Raw Blame History

/*
* JPEG 2000 image decoder
* Copyright (c) 2007 Kamil Nowosad
* Copyright (c) 2013 Nicolas Bertrand <nicoinattendu@gmail.com>
*
* 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 "libavutil/avassert.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "thread.h"
#include "jpeg2000.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;
AVFrame *picture;
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;
int numXtiles, numYtiles;
int maxtilelen;
Jpeg2000CodingStyle codsty[4];
Jpeg2000QuantStyle qntsty[4];
int bit_index;
int curtileno;
Jpeg2000Tile *tile;
/*options parameters*/
int lowres;
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(EINVAL);
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, ret;
ThreadFrame frame = { .f = s->picture };
if (bytestream2_get_bytes_left(&s->g) < 36)
return AVERROR(EINVAL);
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
s->ncomponents = bytestream2_get_be16u(&s->g); // CSiz
if (s->ncomponents <= 0 || s->ncomponents > 4) {
av_log(s->avctx, AV_LOG_ERROR, "unsupported/invalid ncomponents: %d\n", s->ncomponents);
return AVERROR(EINVAL);
}
if (s->tile_width<=0 || s->tile_height<=0)
return AVERROR(EINVAL);
if (bytestream2_get_bytes_left(&s->g) < 3 * s->ncomponents)
return AVERROR(EINVAL);
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) {
av_log(s->avctx, AV_LOG_ERROR, "unsupported/ CDxy values\n");
}
}
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);
if (s->numXtiles * (uint64_t)s->numYtiles > INT_MAX/sizeof(Jpeg2000Tile))
return AVERROR(EINVAL);
s->tile = av_mallocz(s->numXtiles * s->numYtiles * sizeof(*s->tile));
if (!s->tile)
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;
}
if ((ret = ff_thread_get_buffer(s->avctx, &frame, 0)) < 0)
return ret;
s->picture->pict_type = AV_PICTURE_TYPE_I;
s->picture->key_frame = 1;
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(EINVAL);
c->nreslevels = bytestream2_get_byteu(&s->g) + 1; // num of resolution levels - 1
if (c->nreslevels >= JPEG2000_MAX_RESLEVELS) {
av_log(s->avctx, AV_LOG_ERROR, "nreslevels %d is invalid\n", c->nreslevels);
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) & 15) + 2; // cblk width
c->log2_cblk_height = (bytestream2_get_byteu(&s->g) & 15) + 2; // cblk height
if (c->log2_cblk_width > 10 || c->log2_cblk_height > 10 ||
c->log2_cblk_width + c->log2_cblk_height > 14) {
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
av_log(s->avctx, AV_LOG_WARNING, "extra cblk styles %X\n", c->cblk_style);
}
c->transform = bytestream2_get_byteu(&s->g); // DWT transformation type
/* set integer 9/7 DWT in case of BITEXACT flag */
if ((s->avctx->flags & 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;
if (bytestream2_get_bytes_left(&s->g) < 5)
return AVERROR(EINVAL);
tmp.csty = bytestream2_get_byteu(&s->g);
// get progression order
tmp.prog_order = bytestream2_get_byteu(&s->g);
if (tmp.prog_order) {
av_log(s->avctx, AV_LOG_ERROR, "only LRCP progression supported\n");
}
tmp.nlayers = bytestream2_get_be16u(&s->g);
tmp.mct = bytestream2_get_byteu(&s->g); // multiple component transformation
get_cox(s, &tmp);
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;
if (bytestream2_get_bytes_left(&s->g) < 2)
return AVERROR(EINVAL);
compno = bytestream2_get_byteu(&s->g);
c += compno;
c->csty = bytestream2_get_byteu(&s->g);
get_cox(s, c);
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(EINVAL);
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 || 32*3 < n)
return AVERROR(EINVAL);
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(EINVAL);
x = bytestream2_get_be16u(&s->g);
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 (bytestream2_get_bytes_left(&s->g) < 2 * n || 32*3 < n)
return AVERROR(EINVAL);
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;
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(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(EINVAL);
compno = bytestream2_get_byteu(&s->g);
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(EINVAL);
s->curtileno = Isot = bytestream2_get_be16u(&s->g); // Isot
if ((unsigned)s->curtileno >= s->numXtiles * s->numYtiles) {
s->curtileno=0;
return AVERROR(EINVAL);
}
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 (TPsot >= FF_ARRAY_ELEMS(s->tile[s->curtileno].tile_part)) {
av_log(s->avctx, AV_LOG_ERROR, "TPsot %d too big\n", TPsot);
return AVERROR_PATCHWELCOME;
}
s->tile[s->curtileno].tp_idx = TPsot;
tp = s->tile[s->curtileno].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)
cblk->nonzerobits = expn[bandno] + numgbits - 1 -
tag_tree_decode(s, prec->zerobits + cblkno,
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;
}
}
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
|| sizeof(cblk->data) < cblk->lengthinc
)
return AVERROR(EINVAL);
/* 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;
}
}
return 0;
}
static int jpeg2000_decode_packets(Jpeg2000DecoderContext *s, Jpeg2000Tile *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++) {
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 (jpeg2000_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(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, clnpass_cnt = 0;
int bpass_csty_symbol = JPEG2000_CBLK_BYPASS & codsty->cblk_style;
int vert_causal_ctx_csty_symbol = JPEG2000_CBLK_VSC & codsty->cblk_style;
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));
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 & 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, idx;
float *datap = &comp->f_data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
datap[idx] = (float)(t1->data[j][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, idx;
int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * y + x];
for (j = 0; j < (cblk->coord[1][1] - cblk->coord[1][0]); ++j)
for (i = 0; i < (cblk->coord[0][1] - cblk->coord[0][0]); ++i) {
idx = (comp->coord[0][1] - comp->coord[0][0]) * j + i;
datap[idx] =
((int32_t)(t1->data[j][i]) * band->i_stepsize + (1 << 15)) >> 16;
}
}
/* Inverse ICT parameters in float and integer.
* int value = (float value) * (1<<16) */
static const float f_ict_params[4] = {
1.402f,
0.34413f,
0.71414f,
1.772f
};
static const int i_ict_params[4] = {
91881,
22553,
46802,
116130
};
static void mct_decode(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile)
{
int i, csize = 1;
int32_t *src[3], i0, i1, i2;
float *srcf[3], i0f, i1f, i2f;
for (i = 0; i < 3; i++)
if (tile->codsty[0].transform == FF_DWT97)
srcf[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];
switch (tile->codsty[0].transform) {
case FF_DWT97:
for (i = 0; i < csize; i++) {
i0f = *srcf[0] + (f_ict_params[0] * *srcf[2]);
i1f = *srcf[0] - (f_ict_params[1] * *srcf[1])
- (f_ict_params[2] * *srcf[2]);
i2f = *srcf[0] + (f_ict_params[3] * *srcf[1]);
*srcf[0]++ = i0f;
*srcf[1]++ = i1f;
*srcf[2]++ = i2f;
}
break;
case FF_DWT97_INT:
for (i = 0; i < csize; i++) {
i0 = *src[0] + (((i_ict_params[0] * *src[2]) + (1 << 15)) >> 16);
i1 = *src[0] - (((i_ict_params[1] * *src[1]) + (1 << 15)) >> 16)
- (((i_ict_params[2] * *src[2]) + (1 << 15)) >> 16);
i2 = *src[0] + (((i_ict_params[3] * *src[1]) + (1 << 15)) >> 16);
*src[0]++ = i0;
*src[1]++ = i1;
*src[2]++ = i2;
}
break;
case FF_DWT53:
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;
}
break;
}
}
static int jpeg2000_decode_tile(Jpeg2000DecoderContext *s, Jpeg2000Tile *tile,
AVFrame *picture)
{
int compno, reslevelno, bandno;
int x, y;
uint8_t *line;
Jpeg2000T1Context t1;
/* 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++) {
int 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);
/* Manage band offsets */
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 */
/* inverse MCT transformation */
if (tile->codsty[0].mct)
mct_decode(s, tile);
if (s->precision <= 8) {
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000Component *comp = tile->comp + compno;
float *datap = comp->f_data;
int32_t *i_datap = comp->i_data;
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
line = picture->data[0] + y * 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]) {
int val;
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
if (tile->codsty->transform == FF_DWT97)
val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
else
val = *i_datap + (1 << (s->cbps[compno] - 1));
val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
*dst = val << (8 - s->cbps[compno]);
datap++;
i_datap++;
dst += s->ncomponents;
}
line += picture->linesize[0];
}
}
} else {
for (compno = 0; compno < s->ncomponents; compno++) {
Jpeg2000Component *comp = tile->comp + compno;
float *datap = comp->f_data;
int32_t *i_datap = comp->i_data;
uint16_t *linel;
y = tile->comp[compno].coord[1][0] - s->image_offset_y;
linel = (uint16_t*)picture->data[0] + y * (picture->linesize[0] >> 1);
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 = linel + (x * s->ncomponents + compno);
for (; x < tile->comp[compno].coord[0][1] - s->image_offset_x; x += s-> cdx[compno]) {
int val;
/* DC level shift and clip see ISO 15444-1:2002 G.1.2 */
if (tile->codsty->transform == FF_DWT97)
val = lrintf(*datap) + (1 << (s->cbps[compno] - 1));
else
val = *i_datap + (1 << (s->cbps[compno] - 1));
val = av_clip(val, 0, (1 << s->cbps[compno]) - 1);
/* align 12 bit values in little-endian mode */
*dst = val << (16 - s->cbps[compno]);
datap++;
i_datap++;
dst += s->ncomponents;
}
linel += picture->linesize[0]>>1;
}
}
}
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);
}
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;
int 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 = s->tile + s->curtileno;
Jpeg2000TilePart *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;
if (bytestream2_get_bytes_left(&s->g) < 2)
return AVERROR(EINVAL);
len = bytestream2_get_be16u(&s->g);
switch (marker) {
case JPEG2000_SIZ:
ret = get_siz(s);
if (!s->tile)
s->numXtiles = s->numYtiles = 0;
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_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%.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;
}
/* 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 int jpeg2000_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame, AVPacket *avpkt)
{
Jpeg2000DecoderContext *s = avctx->priv_data;
AVFrame *picture = data;
int tileno, ret;
s->picture = picture;
s->avctx = avctx;
bytestream2_init(&s->g, avpkt->data, avpkt->size);
s->curtileno = -1;
// reduction factor, i.e number of resolution levels to skip
s->reduction_factor = avctx->lowres;
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) != JPEG2000_SOC) {
av_log(avctx, AV_LOG_ERROR, "SOC marker not present\n");
ret = -1;
goto err_out;
}
if (ret = jpeg2000_read_main_headers(s))
goto err_out;
if (ret = jpeg2000_read_bitstream_packets(s))
goto err_out;
for (tileno = 0; tileno < s->numXtiles * s->numYtiles; tileno++)
if (ret = jpeg2000_decode_tile(s, s->tile + tileno, s->picture))
goto err_out;
jpeg2000_dec_cleanup(s);
*got_frame = 1;
return bytestream2_tell(&s->g);
err_out:
jpeg2000_dec_cleanup(s);
return ret;
}
static void jpeg2000_init_static_data(AVCodec *codec)
{
ff_jpeg2000_init_tier1_luts();
}
#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(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, JPEG2000_MAX_RESLEVELS - 1, VD },
{ NULL },
};
static const AVProfile profiles[] = {
{ FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_0, "JPEG 2000 codestream restriction 0" },
{ FF_PROFILE_JPEG2000_CSTREAM_RESTRICTION_1, "JPEG 2000 codestream restriction 1" },
{ FF_PROFILE_JPEG2000_CSTREAM_NO_RESTRICTION, "JPEG 2000 no codestream restrictions" },
{ FF_PROFILE_JPEG2000_DCINEMA_2K, "JPEG 2000 digital cinema 2K" },
{ FF_PROFILE_JPEG2000_DCINEMA_4K, "JPEG 2000 digital cinema 4K" },
{ FF_PROFILE_UNKNOWN },
};
static const AVClass class = {
.class_name = "j2k",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
AVCodec ff_j2k_decoder = {
.name = "j2k",
.long_name = NULL_IF_CONFIG_SMALL("JPEG 2000"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_JPEG2000,
.capabilities = CODEC_CAP_EXPERIMENTAL | CODEC_CAP_FRAME_THREADS,
.priv_data_size = sizeof(Jpeg2000DecoderContext),
.init_static_data = jpeg2000_init_static_data,
.decode = jpeg2000_decode_frame,
.priv_class = &class,
.max_lowres = 5,
.profiles = NULL_IF_CONFIG_SMALL(profiles)
};
Reference in New Issue View Git Blame Copy Permalink