j2kenc.c File Reference

JPEG2000 image encoder. More...

#include <float.h>
#include "avcodec.h"
#include "codec_internal.h"
#include "encode.h"
#include "bytestream.h"
#include "jpeg2000.h"
#include "version.h"
#include "libavutil/common.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/thread.h"

Go to the source code of this file.

Data Structures
struct	Jpeg2000Tile
struct	Jpeg2000EncoderContext

Macros
#define	NMSEDEC_BITS   7
#define	NMSEDEC_FRACBITS   (NMSEDEC_BITS-1)
#define	WMSEDEC_SHIFT   13
	must be >= 13 More...
#define	LAMBDA_SCALE   (100000000LL << (WMSEDEC_SHIFT - 13))
#define	CODEC_JP2   1
#define	CODEC_J2K   0
#define	COPY_FRAME(D, PIXEL)
#define	OFFSET(x)   offsetof(Jpeg2000EncoderContext, x)
#define	VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Functions
static void	put_bits (Jpeg2000EncoderContext *s, int val, int n)
	put n times val bit More...
static void	put_num (Jpeg2000EncoderContext *s, int num, int n)
	put n least significant bits of a number num More...
static void	j2k_flush (Jpeg2000EncoderContext *s)
	flush the bitstream More...
static void	tag_tree_code (Jpeg2000EncoderContext *s, Jpeg2000TgtNode *node, int threshold)
	code the value stored in node More...
static void	tag_tree_update (Jpeg2000TgtNode *node)
	update the value in node More...
static int	put_siz (Jpeg2000EncoderContext *s)
static int	put_cod (Jpeg2000EncoderContext *s)
static int	put_qcd (Jpeg2000EncoderContext *s, int compno)
static int	put_com (Jpeg2000EncoderContext *s, int compno)
static uint8_t *	put_sot (Jpeg2000EncoderContext *s, int tileno)
static void	compute_rates (Jpeg2000EncoderContext *s)
static int	init_tiles (Jpeg2000EncoderContext *s)
	compute the sizes of tiles, resolution levels, bands, etc. More...
static void	init_quantization (Jpeg2000EncoderContext *s)
static void	init_luts (void)
static int	getnmsedec_sig (int x, int bpno)
static int	getnmsedec_ref (int x, int bpno)
static void	encode_sigpass (Jpeg2000T1Context *t1, int width, int height, int bandno, int *nmsedec, int bpno)
static void	encode_refpass (Jpeg2000T1Context *t1, int width, int height, int *nmsedec, int bpno)
static void	encode_clnpass (Jpeg2000T1Context *t1, int width, int height, int bandno, int *nmsedec, int bpno)
static void	encode_cblk (Jpeg2000EncoderContext *s, Jpeg2000T1Context *t1, Jpeg2000Cblk *cblk, Jpeg2000Tile *tile, int width, int height, int bandpos, int lev)
static void	putnumpasses (Jpeg2000EncoderContext *s, int n)
static int	encode_packet (Jpeg2000EncoderContext *s, Jpeg2000ResLevel *rlevel, int layno, int precno, const uint8_t *expn, int numgbits, int packetno, int nlayers)
static int	encode_packets (Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int tileno, int nlayers)
static void	makelayer (Jpeg2000EncoderContext *s, int layno, double thresh, Jpeg2000Tile *tile, int final)
static void	makelayers (Jpeg2000EncoderContext *s, Jpeg2000Tile *tile)
static int	getcut (Jpeg2000Cblk *cblk, uint64_t lambda)
static void	truncpasses (Jpeg2000EncoderContext *s, Jpeg2000Tile *tile)
static int	encode_tile (Jpeg2000EncoderContext *s, Jpeg2000Tile *tile, int tileno)
static void	cleanup (Jpeg2000EncoderContext *s)
static void	reinit (Jpeg2000EncoderContext *s)
static void	update_size (uint8_t *size, const uint8_t *end)
static int	encode_frame (AVCodecContext *avctx, AVPacket *pkt, const AVFrame *pict, int *got_packet)
static int	parse_layer_rates (Jpeg2000EncoderContext *s)
static av_cold int	j2kenc_init (AVCodecContext *avctx)
static int	j2kenc_destroy (AVCodecContext *avctx)

Variables
static int	lut_nmsedec_ref [1<< NMSEDEC_BITS]
static int	lut_nmsedec_ref0 [1<< NMSEDEC_BITS]
static int	lut_nmsedec_sig [1<< NMSEDEC_BITS]
static int	lut_nmsedec_sig0 [1<< NMSEDEC_BITS]
static const int	dwt_norms [2][4][10]
static const AVOption	options []
static const AVClass	j2k_class
const FFCodec	ff_jpeg2000_encoder

Detailed Description

JPEG2000 image encoder.

Author

Kamil Nowosad

Definition in file j2kenc.c.

Macro Definition Documentation

NMSEDEC_BITS

#define NMSEDEC_BITS   7

Definition at line 82 of file j2kenc.c.

NMSEDEC_FRACBITS

#define NMSEDEC_FRACBITS   (NMSEDEC_BITS-1)

Definition at line 83 of file j2kenc.c.

WMSEDEC_SHIFT

#define WMSEDEC_SHIFT   13

must be >= 13

Definition at line 84 of file j2kenc.c.

LAMBDA_SCALE

#define LAMBDA_SCALE   (100000000LL << (WMSEDEC_SHIFT - 13))

Definition at line 85 of file j2kenc.c.

CODEC_JP2

#define CODEC_JP2   1

Definition at line 87 of file j2kenc.c.

CODEC_J2K

#define CODEC_J2K   0

Definition at line 88 of file j2kenc.c.

COPY_FRAME

#define COPY_FRAME	(		D,
			PIXEL
	)

Definition at line 508 of file j2kenc.c.

OFFSET

#define OFFSET

(

x

)

offsetof(Jpeg2000EncoderContext, x)

Definition at line 1807 of file j2kenc.c.

VE

#define VE   AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM

Definition at line 1808 of file j2kenc.c.

Function Documentation

put_bits()

static void put_bits ( Jpeg2000EncoderContext *  s, int  val, int  n  )

static

put n times val bit

Definition at line 223 of file j2kenc.c.

Referenced by aac_adtstoasc_filter(), aac_encode_frame(), ac3_output_frame_header(), adpcm_encode_frame(), adts_decode_extradata(), adts_write_frame_header(), asv1_encode_block(), asv1_put_level(), av_dynamic_hdr_plus_to_t35(), avpriv_dca_convert_bitstream(), binary_export(), bit_copy(), cbs_av1_write_increment(), cbs_av1_write_leb128(), cbs_av1_write_ns(), cbs_av1_write_obu(), cbs_av1_write_uvlc(), cbs_h2645_write_slice_data(), cbs_mpeg2_write_slice(), cbs_vp9_write_increment(), cbs_vp9_write_le(), cbs_vp9_write_s(), cbs_write_se_golomb(), cbs_write_ue_golomb(), cfhd_encode_frame(), codebook_trellis_rate(), copy_bits(), dca_vlc_enc_alloc(), dca_vlc_enc_quant(), dnxhd_encode_block(), dnxhd_encode_dc(), dnxhd_encode_thread(), dv_encode_ac(), dv_encode_video_segment(), eac3_output_frame_header(), encode_422_bitstream(), encode_aspect_ratio(), encode_bitstream(), encode_block(), encode_clean_area(), encode_color_spec(), encode_exp_vlc(), encode_ext_header(), encode_flush(), encode_four_color_block(), encode_frame(), encode_frame_rate(), encode_frame_size(), encode_hq_slice(), encode_individual_channel(), encode_line(), encode_ms_info(), encode_packet(), encode_parse_info(), encode_picture_ls(), encode_plane_slice(), encode_pulses(), encode_quant_matrix(), encode_sample_fmt(), encode_scalar(), encode_scale_factors(), encode_scan_format(), encode_signal_range(), encode_subband(), encode_superframe(), encode_table(), encode_vlc_codeword(), encode_window_bands_info(), encode_yuv422p10(), ff_aac_encode_ltp_info(), ff_aac_encode_main_pred(), ff_aac_encode_tns_info(), ff_alloc_timecode_sei(), ff_cbs_write_unsigned(), ff_copy_bits(), ff_dolby_e_convert_input(), ff_dovi_rpu_generate(), ff_flv2_encode_ac_esc(), ff_flv_encode_picture_header(), ff_h261_encode_mb(), ff_h261_encode_picture_header(), ff_h263_encode_gob_header(), ff_h263_encode_mb(), ff_h263_encode_mba(), ff_h263_encode_motion(), ff_h263_encode_picture_header(), ff_hevc_encode_nal_vps(), ff_iamf_write_audio_frame(), ff_isom_put_dvcc_dvvc(), ff_isom_write_av1c(), ff_lzw_encode_flush(), ff_mjpeg_encode_dc(), ff_mjpeg_encode_picture_header(), ff_mjpeg_escape_FF(), ff_mjpeg_find_marker(), ff_mpeg4_encode_mb(), ff_mpeg4_encode_picture_header(), ff_mpeg4_encode_video_packet_header(), ff_mpeg4_merge_partitions(), ff_mpeg4_stuffing(), ff_mpv_encode_picture(), ff_msmpeg4_code012(), ff_msmpeg4_encode_block(), ff_msmpeg4_encode_ext_header(), ff_msmpeg4_encode_mb(), ff_msmpeg4_encode_motion(), ff_msmpeg4_encode_picture_header(), ff_pce_copy_bits(), ff_put_string(), ff_rv10_encode_picture_header(), ff_rv20_encode_picture_header(), ff_wmv2_encode_mb(), ff_wmv2_encode_picture_header(), ff_write_quant_matrix(), floor_encode(), flv_write_codec_header(), generate_ext_v1(), generate_ext_v2(), h261_encode_block(), h261_encode_gob_header(), h261_encode_motion(), h263_encode_block(), h263p_encode_umotion(), iamf_write_audio_element(), iamf_write_codec_config(), iamf_write_mixing_presentation(), jpeg_put_comments(), jpeg_table_header(), latm_write_frame_header(), latm_write_packet(), ls_encode_run(), main(), mov_write_ac3_tag(), mov_write_dvc1_structs(), mov_write_eac3_tag(), mpeg4_encode_block(), mpeg4_encode_dc(), mpeg4_encode_gop_header(), mpeg4_encode_visual_object_header(), mpeg4_encode_vol_header(), msmpeg4_encode_dc(), msmpeg4v2_encode_motion(), output_audio_block(), pack_bitstream(), pack_float_sample(), pnm_decode_frame(), put_alpha_diff(), put_alpha_run(), put_audio_specific_config(), put_bitstream_info(), put_cabac_bit(), put_cabac_terminate(), put_codebook_header(), put_codeword(), put_floor_header(), put_frame_header(), put_huffman_table(), put_ics_info(), put_main_header(), put_marker(), put_num(), put_pack_header(), put_pce(), put_primary_audio_header(), put_residue_header(), put_runcode(), put_subframe(), put_subframe_samples(), put_swf_line_edge(), put_swf_matrix(), put_swf_rect(), put_system_header(), put_vc2_ue_uint(), put_xsub_rle(), quantize_and_encode_band_cost_template(), ra144_encode_frame(), ra144_encode_subblock(), rpza_encode_stream(), s302m_encode2_frame(), save_bits(), sbc_pack_frame(), scalable_channel_layout_config(), send_mode_a(), send_mode_b(), set_sr_golomb_flac(), set_te_golomb(), set_ue_golomb(), set_ue_golomb_long(), set_ur_golomb(), set_ur_golomb_jpegls(), svq1_encode_frame(), svq1_encode_plane(), svq1_write_header(), swf_write_header(), tag_tree_code(), tta_encode_frame(), update_extradata(), vorbis_encode_frame(), vp9_raw_reorder_make_output(), vvcc_write(), wavpack_encode_sample(), write_block_data(), write_decoding_params(), write_element(), write_element_header(), write_filter_params(), write_frame(), write_frame_footer(), write_frame_header(), write_header(), write_huff_codes(), write_major_sync(), write_matrix_params(), write_parameter_block(), write_ptl(), write_ptl_layer(), write_restart_header(), write_streaminfo(), write_subframes(), write_substr(), write_utf8(), and writeCode().

put_num()

static void put_num ( Jpeg2000EncoderContext *  s, int  num, int  n  )

static

put n least significant bits of a number num

Definition at line 236 of file j2kenc.c.

Referenced by encode_packet(), and putnumpasses().

j2k_flush()

static void j2k_flush ( Jpeg2000EncoderContext *  s )

static

flush the bitstream

Definition at line 243 of file j2kenc.c.

Referenced by encode_packet().

tag_tree_code()

static void tag_tree_code ( Jpeg2000EncoderContext *  s, Jpeg2000TgtNode *  node, int  threshold  )

static

code the value stored in node

Definition at line 254 of file j2kenc.c.

Referenced by encode_packet().

tag_tree_update()

static void tag_tree_update ( Jpeg2000TgtNode *  node )

static

update the value in node

Definition at line 291 of file j2kenc.c.

Referenced by encode_packet().

put_siz()

static int put_siz ( Jpeg2000EncoderContext *  s )

static

Definition at line 301 of file j2kenc.c.

Referenced by encode_frame().

put_cod()

static int put_cod ( Jpeg2000EncoderContext *  s )

static

Definition at line 330 of file j2kenc.c.

Referenced by encode_frame().

put_qcd()

static int put_qcd ( Jpeg2000EncoderContext *  s, int  compno  )

static

Definition at line 362 of file j2kenc.c.

Referenced by encode_frame().

put_com()

static int put_com ( Jpeg2000EncoderContext *  s, int  compno  )

static

Definition at line 388 of file j2kenc.c.

Referenced by encode_frame().

put_sot()

static uint8_t* put_sot ( Jpeg2000EncoderContext *  s, int  tileno  )

static

Definition at line 407 of file j2kenc.c.

Referenced by encode_frame().

compute_rates()

static void compute_rates ( Jpeg2000EncoderContext *  s )

static

Definition at line 426 of file j2kenc.c.

Referenced by init_tiles().

init_tiles()

static int init_tiles ( Jpeg2000EncoderContext *  s )

static

compute the sizes of tiles, resolution levels, bands, etc.

allocate memory for them divide the input image into tile-components

Definition at line 456 of file j2kenc.c.

Referenced by j2kenc_init().

init_quantization()

static void init_quantization ( Jpeg2000EncoderContext *  s )

static

Definition at line 553 of file j2kenc.c.

Referenced by j2kenc_init().

init_luts()

static void init_luts ( void  )

static

Definition at line 583 of file j2kenc.c.

Referenced by j2kenc_init().

getnmsedec_sig()

static int getnmsedec_sig ( int  x, int  bpno  )

static

Definition at line 602 of file j2kenc.c.

Referenced by encode_clnpass(), and encode_sigpass().

getnmsedec_ref()

static int getnmsedec_ref ( int  x, int  bpno  )

static

Definition at line 609 of file j2kenc.c.

Referenced by encode_refpass().

encode_sigpass()

static void encode_sigpass ( Jpeg2000T1Context *  t1, int  width, int  height, int  bandno, int *  nmsedec, int  bpno  )

static

Definition at line 616 of file j2kenc.c.

Referenced by encode_cblk().

encode_refpass()

static void encode_refpass ( Jpeg2000T1Context *  t1, int  width, int  height, int *  nmsedec, int  bpno  )

static

Definition at line 638 of file j2kenc.c.

Referenced by encode_cblk().

encode_clnpass()

static void encode_clnpass ( Jpeg2000T1Context *  t1, int  width, int  height, int  bandno, int *  nmsedec, int  bpno  )

static

Definition at line 652 of file j2kenc.c.

Referenced by encode_cblk().

encode_cblk()

static void encode_cblk ( Jpeg2000EncoderContext *  s, Jpeg2000T1Context *  t1, Jpeg2000Cblk *  cblk, Jpeg2000Tile *  tile, int  width, int  height, int  bandpos, int  lev  )

static

Definition at line 707 of file j2kenc.c.

Referenced by encode_tile().

putnumpasses()

static void putnumpasses ( Jpeg2000EncoderContext *  s, int  n  )

static

Definition at line 769 of file j2kenc.c.

Referenced by encode_packet().

encode_packet()

static int encode_packet ( Jpeg2000EncoderContext *  s, Jpeg2000ResLevel *  rlevel, int  layno, int  precno, const uint8_t *  expn, int  numgbits, int  packetno, int  nlayers  )

static

Definition at line 784 of file j2kenc.c.

Referenced by encode_packets().

encode_packets()

static int encode_packets ( Jpeg2000EncoderContext *  s, Jpeg2000Tile *  tile, int  tileno, int  nlayers  )

static

Definition at line 940 of file j2kenc.c.

Referenced by encode_tile(), and makelayers().

makelayer()

static void makelayer ( Jpeg2000EncoderContext *  s, int  layno, double  thresh, Jpeg2000Tile *  tile, int  final  )

static

Definition at line 1186 of file j2kenc.c.

Referenced by makelayers().

makelayers()

static void makelayers ( Jpeg2000EncoderContext *  s, Jpeg2000Tile *  tile  )

static

Definition at line 1269 of file j2kenc.c.

Referenced by encode_tile().

getcut()

static int getcut ( Jpeg2000Cblk *  cblk, uint64_t  lambda  )

static

Definition at line 1352 of file j2kenc.c.

Referenced by truncpasses().

truncpasses()

static void truncpasses ( Jpeg2000EncoderContext *  s, Jpeg2000Tile *  tile  )

static

Definition at line 1370 of file j2kenc.c.

Referenced by encode_tile().

encode_tile()

static int encode_tile ( Jpeg2000EncoderContext *  s, Jpeg2000Tile *  tile, int  tileno  )

static

Definition at line 1405 of file j2kenc.c.

Referenced by encode_frame().

cleanup()

static void cleanup ( Jpeg2000EncoderContext *  s )

static

Definition at line 1496 of file j2kenc.c.

Referenced by j2kenc_destroy().

reinit()

static void reinit ( Jpeg2000EncoderContext *  s )

static

Definition at line 1516 of file j2kenc.c.

Referenced by encode_frame().

update_size()

static void update_size ( uint8_t *  size, const uint8_t *  end  )

static

Definition at line 1526 of file j2kenc.c.

Referenced by encode_frame().

encode_frame()

static int encode_frame ( AVCodecContext *  avctx, AVPacket *  pkt, const AVFrame *  pict, int *  got_packet  )

static

Definition at line 1531 of file j2kenc.c.

parse_layer_rates()

static int parse_layer_rates ( Jpeg2000EncoderContext *  s )

static

Definition at line 1670 of file j2kenc.c.

Referenced by j2kenc_init().

j2kenc_init()

static av_cold int j2kenc_init ( AVCodecContext *  avctx )

static

Definition at line 1717 of file j2kenc.c.

j2kenc_destroy()

static int j2kenc_destroy ( AVCodecContext *  avctx )

static

Definition at line 1797 of file j2kenc.c.

Variable Documentation

lut_nmsedec_ref

int lut_nmsedec_ref[1<< NMSEDEC_BITS]

static

Definition at line 90 of file j2kenc.c.

Referenced by getnmsedec_ref(), and init_luts().

lut_nmsedec_ref0

int lut_nmsedec_ref0[1<< NMSEDEC_BITS]

static

Definition at line 91 of file j2kenc.c.

Referenced by getnmsedec_ref(), and init_luts().

lut_nmsedec_sig

int lut_nmsedec_sig[1<< NMSEDEC_BITS]

static

Definition at line 92 of file j2kenc.c.

Referenced by getnmsedec_sig(), and init_luts().

lut_nmsedec_sig0

int lut_nmsedec_sig0[1<< NMSEDEC_BITS]

static

Definition at line 93 of file j2kenc.c.

Referenced by getnmsedec_sig(), and init_luts().

dwt_norms

const int dwt_norms[2][4][10]

static

Initial value:

= { 
    {{10000, 19650, 41770,  84030, 169000, 338400,  676900, 1353000, 2706000, 5409000},
     {20220, 39890, 83550, 170400, 342700, 686300, 1373000, 2746000, 5490000},
     {20220, 39890, 83550, 170400, 342700, 686300, 1373000, 2746000, 5490000},
     {20800, 38650, 83070, 171800, 347100, 695900, 1393000, 2786000, 5572000}},
 
    {{10000, 15000, 27500, 53750, 106800, 213400, 426700, 853300, 1707000, 3413000},
     {10380, 15920, 29190, 57030, 113300, 226400, 452500, 904800, 1809000},
     {10380, 15920, 29190, 57030, 113300, 226400, 452500, 904800, 1809000},
     { 7186,  9218, 15860, 30430,  60190, 120100, 240000, 479700,  959300}}
}

Definition at line 95 of file j2kenc.c.

Referenced by init_quantization(), and truncpasses().

options

const AVOption options[]

static

Initial value:

= {
    { "format",        "Codec Format",      OFFSET(format),        AV_OPT_TYPE_INT,   { .i64 = CODEC_JP2   }, CODEC_J2K, CODEC_JP2,   VE, .unit = "format"      },
    { "j2k",           NULL,                0,                     AV_OPT_TYPE_CONST, { .i64 = CODEC_J2K   }, 0,         0,           VE, .unit = "format"      },
    { "jp2",           NULL,                0,                     AV_OPT_TYPE_CONST, { .i64 = CODEC_JP2   }, 0,         0,           VE, .unit = "format"      },
    { "tile_width",    "Tile Width",        OFFSET(tile_width),    AV_OPT_TYPE_INT,   { .i64 = 256         }, 1,     1<<30,           VE, },
    { "tile_height",   "Tile Height",       OFFSET(tile_height),   AV_OPT_TYPE_INT,   { .i64 = 256         }, 1,     1<<30,           VE, },
    { "pred",          "DWT Type",          OFFSET(pred),          AV_OPT_TYPE_INT,   { .i64 = 0           }, 0,         1,           VE, .unit = "pred"        },
    { "dwt97int",      NULL,                0,                     AV_OPT_TYPE_CONST, { .i64 = 0           }, INT_MIN, INT_MAX,       VE, .unit = "pred"        },
    { "dwt53",         NULL,                0,                     AV_OPT_TYPE_CONST, { .i64 = 1           }, INT_MIN, INT_MAX,       VE, .unit = "pred"        },
    { "sop",           "SOP marker",        OFFSET(sop),           AV_OPT_TYPE_INT,   { .i64 = 0           }, 0,         1,           VE, },
    { "eph",           "EPH marker",        OFFSET(eph),           AV_OPT_TYPE_INT,   { .i64 = 0           }, 0,         1,           VE, },
    { "prog",          "Progression Order", OFFSET(prog),          AV_OPT_TYPE_INT,   { .i64 = 0           }, JPEG2000_PGOD_LRCP,         JPEG2000_PGOD_CPRL,           VE, .unit = "prog" },
    { "lrcp",          NULL,                0,                     AV_OPT_TYPE_CONST,  { .i64 = JPEG2000_PGOD_LRCP }, 0,         0,           VE, .unit = "prog" },
    { "rlcp",          NULL,                0,                     AV_OPT_TYPE_CONST,  { .i64 = JPEG2000_PGOD_RLCP }, 0,         0,           VE, .unit = "prog" },
    { "rpcl",          NULL,                0,                     AV_OPT_TYPE_CONST,  { .i64 = JPEG2000_PGOD_RPCL }, 0,         0,           VE, .unit = "prog" },
    { "pcrl",          NULL,                0,                     AV_OPT_TYPE_CONST,  { .i64 = JPEG2000_PGOD_PCRL }, 0,         0,           VE, .unit = "prog" },
    { "cprl",          NULL,                0,                     AV_OPT_TYPE_CONST,  { .i64 = JPEG2000_PGOD_CPRL }, 0,         0,           VE, .unit = "prog" },
    { "layer_rates",   "Layer Rates",       OFFSET(lr_str),        AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, VE },
    { NULL }
}

Definition at line 1809 of file j2kenc.c.

j2k_class

const AVClass j2k_class

static

Initial value:

= {
    .class_name = "jpeg 2000 encoder",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 1830 of file j2kenc.c.

ff_jpeg2000_encoder

const FFCodec ff_jpeg2000_encoder

Definition at line 1837 of file j2kenc.c.