2 * Copyright (c) 2002-2007, Communications and Remote Sensing Laboratory, Universite catholique de Louvain (UCL), Belgium
3 * Copyright (c) 2002-2007, Professor Benoit Macq
4 * Copyright (c) 2001-2003, David Janssens
5 * Copyright (c) 2002-2003, Yannick Verschueren
6 * Copyright (c) 2003-2007, Francois-Olivier Devaux and Antonin Descampe
7 * Copyright (c) 2005, Herve Drolon, FreeImage Team
8 * Copyright (c) 2006-2007, Parvatha Elangovan
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
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18 * documentation and/or other materials provided with the distribution.
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
21 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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23 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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36 @brief The JPEG-2000 Codestream Reader/Writer (J2K)
38 The functions in J2K.C have for goal to read/write the several parts of the codestream: markers and data.
41 /** @defgroup J2K J2K - JPEG-2000 codestream reader/writer */
44 #define J2K_CP_CSTY_PRT 0x01
45 #define J2K_CP_CSTY_SOP 0x02
46 #define J2K_CP_CSTY_EPH 0x04
47 #define J2K_CCP_CSTY_PRT 0x01
48 #define J2K_CCP_CBLKSTY_LAZY 0x01 /**< Selective arithmetic coding bypass */
49 #define J2K_CCP_CBLKSTY_RESET 0x02 /**< Reset context probabilities on coding pass boundaries */
50 #define J2K_CCP_CBLKSTY_TERMALL 0x04 /**< Termination on each coding pass */
51 #define J2K_CCP_CBLKSTY_VSC 0x08 /**< Vertically stripe causal context */
52 #define J2K_CCP_CBLKSTY_PTERM 0x10 /**< Predictable termination */
53 #define J2K_CCP_CBLKSTY_SEGSYM 0x20 /**< Segmentation symbols are used */
54 #define J2K_CCP_QNTSTY_NOQNT 0
55 #define J2K_CCP_QNTSTY_SIQNT 1
56 #define J2K_CCP_QNTSTY_SEQNT 2
58 /* ----------------------------------------------------------------------- */
60 #define J2K_MS_SOC 0xff4f /**< SOC marker value */
61 #define J2K_MS_SOT 0xff90 /**< SOT marker value */
62 #define J2K_MS_SOD 0xff93 /**< SOD marker value */
63 #define J2K_MS_EOC 0xffd9 /**< EOC marker value */
64 #define J2K_MS_SIZ 0xff51 /**< SIZ marker value */
65 #define J2K_MS_COD 0xff52 /**< COD marker value */
66 #define J2K_MS_COC 0xff53 /**< COC marker value */
67 #define J2K_MS_RGN 0xff5e /**< RGN marker value */
68 #define J2K_MS_QCD 0xff5c /**< QCD marker value */
69 #define J2K_MS_QCC 0xff5d /**< QCC marker value */
70 #define J2K_MS_POC 0xff5f /**< POC marker value */
71 #define J2K_MS_TLM 0xff55 /**< TLM marker value */
72 #define J2K_MS_PLM 0xff57 /**< PLM marker value */
73 #define J2K_MS_PLT 0xff58 /**< PLT marker value */
74 #define J2K_MS_PPM 0xff60 /**< PPM marker value */
75 #define J2K_MS_PPT 0xff61 /**< PPT marker value */
76 #define J2K_MS_SOP 0xff91 /**< SOP marker value */
77 #define J2K_MS_EPH 0xff92 /**< EPH marker value */
78 #define J2K_MS_CRG 0xff63 /**< CRG marker value */
79 #define J2K_MS_COM 0xff64 /**< COM marker value */
82 #define J2K_MS_CBD 0xff78 /**< CBD marker value */
83 #define J2K_MS_MCC 0xff75 /**< MCC marker value */
84 #define J2K_MS_MCT 0xff74 /**< MCT marker value */
85 #define J2K_MS_MCO 0xff77 /**< MCO marker value */
90 #define J2K_MS_EPC 0xff68 /**< EPC marker value (Part 11: JPEG 2000 for Wireless) */
91 #define J2K_MS_EPB 0xff66 /**< EPB marker value (Part 11: JPEG 2000 for Wireless) */
92 #define J2K_MS_ESD 0xff67 /**< ESD marker value (Part 11: JPEG 2000 for Wireless) */
93 #define J2K_MS_RED 0xff69 /**< RED marker value (Part 11: JPEG 2000 for Wireless) */
96 #define J2K_MS_SEC 0xff65 /**< SEC marker value (Part 8: Secure JPEG 2000) */
97 #define J2K_MS_INSEC 0xff94 /**< INSEC marker value (Part 8: Secure JPEG 2000) */
98 #endif /* USE_JPSEC */
102 struct opj_stream_private;
104 /* ----------------------------------------------------------------------- */
107 Values that specify the status of the decoding process when decoding the main header.
108 These values may be combined with a | operator.
110 typedef enum J2K_STATUS {
111 J2K_STATE_MHSOC = 0x0001, /**< a SOC marker is expected */
112 J2K_STATE_MHSIZ = 0x0002, /**< a SIZ marker is expected */
113 J2K_STATE_MH = 0x0004, /**< the decoding process is in the main header */
114 J2K_STATE_TPHSOT = 0x0008, /**< the decoding process is in a tile part header and expects a SOT marker */
115 J2K_STATE_TPH = 0x0010, /**< the decoding process is in a tile part header */
116 J2K_STATE_MT = 0x0020, /**< the EOC marker has just been read */
117 J2K_STATE_NEOC = 0x0040, /**< the decoding process must not expect a EOC marker because the codestream is truncated */
118 J2K_STATE_ERR = 0x0080 /**< the decoding process has encountered an error */
121 /* ----------------------------------------------------------------------- */
126 typedef enum T2_MODE {
127 THRESH_CALC = 0, /** Function called in Rate allocation process*/
128 FINAL_PASS = 1 /** Function called in Tier 2 process*/
132 Quantization stepsize
134 typedef struct opj_stepsize {
142 //Tile-component coding parameters
144 //typedef struct opj_tccp {
145 // /** coding style */
147 // /** number of resolutions */
148 // int numresolutions;
149 // /** code-blocks width */
151 // /** code-blocks height */
153 // /** code-block coding style */
155 // /** discrete wavelet transform identifier */
157 // /** quantisation style */
159 // /** stepsizes used for quantization */
160 // opj_stepsize_t stepsizes[J2K_MAXBANDS];
161 // /** number of guard bits */
163 // /** Region Of Interest shift */
165 // /** precinct width */
166 // int prcw[J2K_MAXRLVLS];
167 // /** precinct height */
168 // int prch[J2K_MAXRLVLS];
172 Tile-component coding parameters
174 typedef struct opj_tccp
178 /** number of resolutions */
179 OPJ_UINT32 numresolutions;
180 /** code-blocks width */
182 /** code-blocks height */
184 /** code-block coding style */
186 /** discrete wavelet transform identifier */
188 /** quantisation style */
190 /** stepsizes used for quantization */
191 opj_stepsize_t stepsizes[J2K_MAXBANDS];
192 /** number of guard bits */
194 /** Region Of Interest shift */
196 /** precinct width */
197 OPJ_UINT32 prcw[J2K_MAXRLVLS];
198 /** precinct height */
199 OPJ_UINT32 prch[J2K_MAXRLVLS];
200 /** the dc_level_shift **/
201 OPJ_INT32 m_dc_level_shift;
207 Tile coding parameters :
208 this structure is used to store coding/decoding parameters common to all
209 tiles (information like COD, COC in main header)
211 typedef struct opj_tcp {
212 /** 1 : first part-tile of a tile */
216 /** progression order */
218 /** number of layers */
220 /** multi-component transform identifier */
222 /** rates of layers */
224 /** number of progression order changes */
226 /** indicates if a POC marker has been used O:NO, 1:YES */
228 /** progression order changes */
230 /** packet header store there for futur use in t2_decode_packet */
231 unsigned char *ppt_data;
232 /** pointer remaining on the first byte of the first header if ppt is used */
233 unsigned char *ppt_data_first;
234 /** If ppt == 1 --> there was a PPT marker for the present tile */
236 /** used in case of multiple marker PPT (number of info already stored) */
240 /** add fixed_quality */
241 float distoratio[100];
242 /** tile-component coding parameters */
248 * Type of data for storing the MCT data
250 typedef enum MCT_ELEMENT_TYPE
252 MCT_TYPE_INT16 = 0, /** MCT data is stored as signed shorts*/
253 MCT_TYPE_INT32 = 1, /** MCT data is stored as signed integers*/
254 MCT_TYPE_FLOAT = 2, /** MCT data is stored as floats*/
255 MCT_TYPE_DOUBLE = 3 /** MCT data is stored as doubles*/
256 } J2K_MCT_ELEMENT_TYPE;
259 * Type of data for storing the MCT data
261 typedef enum MCT_ARRAY_TYPE
263 MCT_TYPE_DEPENDENCY = 0,
264 MCT_TYPE_DECORRELATION = 1,
266 } J2K_MCT_ARRAY_TYPE;
268 typedef struct opj_mct_data
270 J2K_MCT_ELEMENT_TYPE m_element_type;
271 J2K_MCT_ARRAY_TYPE m_array_type;
274 OPJ_UINT32 m_data_size;
278 typedef struct opj_simple_mcc_decorrelation_data
281 OPJ_UINT32 m_nb_comps;
282 opj_mct_data_t * m_decorrelation_array;
283 opj_mct_data_t * m_offset_array;
284 OPJ_UINT32 m_is_irreversible : 1;
286 opj_simple_mcc_decorrelation_data_t;
289 Tile coding parameters :
290 this structure is used to store coding/decoding parameters common to all
291 tiles (information like COD, COC in main header)
293 typedef struct opj_tcp_v2
297 /** progression order */
299 /** number of layers */
300 OPJ_UINT32 numlayers;
301 OPJ_UINT32 num_layers_to_decode;
302 /** multi-component transform identifier */
304 /** rates of layers */
305 OPJ_FLOAT32 rates[100];
306 /** number of progression order changes */
308 /** progression order changes */
310 /** packet header store there for futur use in t2_decode_packet */
312 /** used to keep a track of the allocated memory */
313 OPJ_BYTE *ppt_buffer;
314 /** Number of bytes stored inside ppt_data*/
315 OPJ_UINT32 ppt_data_size;
316 /** size of ppt_data*/
318 /** add fixed_quality */
319 OPJ_FLOAT32 distoratio[100];
320 /** tile-component coding parameters */
322 /** number of tile parts for the tile. */
323 OPJ_UINT32 m_nb_tile_parts;
324 /** data for the tile */
327 OPJ_UINT32 m_data_size;
328 /** encoding norms */
329 OPJ_FLOAT64 * mct_norms;
330 /** the mct decoding matrix */
331 OPJ_FLOAT32 * m_mct_decoding_matrix;
332 /** the mct coding matrix */
333 OPJ_FLOAT32 * m_mct_coding_matrix;
335 opj_mct_data_t * m_mct_records;
336 /** the number of mct records. */
337 OPJ_UINT32 m_nb_mct_records;
338 /** the max number of mct records. */
339 OPJ_UINT32 m_nb_max_mct_records;
341 opj_simple_mcc_decorrelation_data_t * m_mcc_records;
342 /** the number of mct records. */
343 OPJ_UINT32 m_nb_mcc_records;
344 /** the max number of mct records. */
345 OPJ_UINT32 m_nb_max_mcc_records;
349 /***** FLAGS *******/
350 /** If ppt == 1 --> there was a PPT marker for the present tile */
352 /** indicates if a POC marker has been used O:NO, 1:YES */
363 typedef struct opj_cp {
364 /** Digital cinema profile*/
365 OPJ_CINEMA_MODE cinema;
366 /** Maximum rate for each component. If == 0, component size limitation is not considered */
368 /** Size of the image in bits*/
371 OPJ_RSIZ_CAPABILITIES rsiz;
372 /** Enabling Tile part generation*/
374 /** Flag determining tile part generation*/
376 /** Position of tile part flag in progression order*/
378 /** allocation by rate/distortion */
380 /** allocation by fixed layer */
382 /** add fixed_quality */
384 /** if != 0, then original dimension divided by 2^(reduce); if == 0 or not used, image is decoded to the full resolution */
386 /** if != 0, then only the first "layer" layers are decoded; if == 0 or not used, all the quality layers are decoded */
388 /** if == NO_LIMITATION, decode entire codestream; if == LIMIT_TO_MAIN_HEADER then only decode the main header */
389 OPJ_LIMIT_DECODING limit_decoding;
398 /** comment for coding */
400 /** number of tiles in width */
402 /** number of tiles in heigth */
404 /** ID number of the tiles present in the codestream */
406 /** size of the vector tileno */
408 /** packet header store there for futur use in t2_decode_packet */
409 unsigned char *ppm_data;
410 /** pointer remaining on the first byte of the first header if ppm is used */
411 unsigned char *ppm_data_first;
412 /** if ppm == 1 --> there was a PPM marker for the present tile */
414 /** use in case of multiple marker PPM (number of info already store) */
416 /** use in case of multiple marker PPM (case on non-finished previous info) */
420 /** tile coding parameters */
426 /** enables writing of EPC in MH, thus activating JPWL */
428 /** enables writing of EPB, in case of activated JPWL */
430 /** enables writing of ESD, in case of activated JPWL */
432 /** enables writing of informative techniques of ESD, in case of activated JPWL */
434 /** enables writing of RED, in case of activated JPWL */
436 /** error protection method for MH (0,1,16,32,37-128) */
438 /** tile number of header protection specification (>=0) */
439 int hprot_TPH_tileno[JPWL_MAX_NO_TILESPECS];
440 /** error protection methods for TPHs (0,1,16,32,37-128) */
441 int hprot_TPH[JPWL_MAX_NO_TILESPECS];
442 /** tile number of packet protection specification (>=0) */
443 int pprot_tileno[JPWL_MAX_NO_PACKSPECS];
444 /** packet number of packet protection specification (>=0) */
445 int pprot_packno[JPWL_MAX_NO_PACKSPECS];
446 /** error protection methods for packets (0,1,16,32,37-128) */
447 int pprot[JPWL_MAX_NO_PACKSPECS];
448 /** enables writing of ESD, (0/2/4 bytes) */
450 /** sensitivity addressing size (0=auto/2/4 bytes) */
452 /** sensitivity range (0-3) */
454 /** sensitivity method for MH (-1,0-7) */
456 /** tile number of sensitivity specification (>=0) */
457 int sens_TPH_tileno[JPWL_MAX_NO_TILESPECS];
458 /** sensitivity methods for TPHs (-1,0-7) */
459 int sens_TPH[JPWL_MAX_NO_TILESPECS];
460 /** enables JPWL correction at the decoder */
462 /** expected number of components at the decoder */
464 /** maximum number of tiles at the decoder */
466 #endif /* USE_JPWL */
470 typedef struct opj_encoding_param
472 /** Digital cinema profile*/
473 OPJ_CINEMA_MODE m_cinema;
474 /** Maximum rate for each component. If == 0, component size limitation is not considered */
475 OPJ_UINT32 m_max_comp_size;
476 /** Position of tile part flag in progression order*/
479 OPJ_INT32 *m_matrice;
480 /** Flag determining tile part generation*/
482 /** allocation by rate/distortion */
483 OPJ_UINT32 m_disto_alloc : 1;
484 /** allocation by fixed layer */
485 OPJ_UINT32 m_fixed_alloc : 1;
486 /** add fixed_quality */
487 OPJ_UINT32 m_fixed_quality : 1;
488 /** Enabling Tile part generation*/
489 OPJ_UINT32 m_tp_on : 1;
491 opj_encoding_param_t;
493 typedef struct opj_decoding_param
495 /** if != 0, then original dimension divided by 2^(reduce); if == 0 or not used, image is decoded to the full resolution */
497 /** if != 0, then only the first "layer" layers are decoded; if == 0 or not used, all the quality layers are decoded */
500 opj_decoding_param_t;
506 typedef struct opj_cp_v2
508 /** Size of the image in bits*/
511 OPJ_RSIZ_CAPABILITIES rsiz;
513 OPJ_UINT32 tx0; // MSD see norm
515 OPJ_UINT32 ty0; // MSD see norm
522 /** number of tiles in width */
524 /** number of tiles in heigth */
526 /** packet header storage original buffer */
527 OPJ_BYTE *ppm_buffer;
528 /** packet header store there for futur use in t2_decode_packet */
530 /** size of the ppm_data*/
532 /** Number of bytes actually stored inside the ppm_data */
533 OPJ_UINT32 ppm_data_size;
534 /** tile coding parameters */
538 opj_decoding_param_t m_dec;
539 opj_encoding_param_t m_enc;
546 /** enables writing of EPC in MH, thus activating JPWL */
548 /** enables writing of EPB, in case of activated JPWL */
550 /** enables writing of ESD, in case of activated JPWL */
552 /** enables writing of informative techniques of ESD, in case of activated JPWL */
554 /** enables writing of RED, in case of activated JPWL */
556 /** error protection method for MH (0,1,16,32,37-128) */
558 /** tile number of header protection specification (>=0) */
559 int hprot_TPH_tileno[JPWL_MAX_NO_TILESPECS];
560 /** error protection methods for TPHs (0,1,16,32,37-128) */
561 int hprot_TPH[JPWL_MAX_NO_TILESPECS];
562 /** tile number of packet protection specification (>=0) */
563 int pprot_tileno[JPWL_MAX_NO_PACKSPECS];
564 /** packet number of packet protection specification (>=0) */
565 int pprot_packno[JPWL_MAX_NO_PACKSPECS];
566 /** error protection methods for packets (0,1,16,32,37-128) */
567 int pprot[JPWL_MAX_NO_PACKSPECS];
568 /** enables writing of ESD, (0/2/4 bytes) */
570 /** sensitivity addressing size (0=auto/2/4 bytes) */
572 /** sensitivity range (0-3) */
574 /** sensitivity method for MH (-1,0-7) */
576 /** tile number of sensitivity specification (>=0) */
577 int sens_TPH_tileno[JPWL_MAX_NO_TILESPECS];
578 /** sensitivity methods for TPHs (-1,0-7) */
579 int sens_TPH[JPWL_MAX_NO_TILESPECS];
580 /** enables JPWL correction at the decoder */
582 /** expected number of components at the decoder */
584 /** maximum number of tiles at the decoder */
586 #endif /* USE_JPWL */
588 /******** FLAGS *********/
589 /** if ppm == 1 --> there was a PPM marker*/
591 /** tells if the parameter is a coding or decoding one */
592 OPJ_UINT32 m_is_decoder : 1;
597 typedef struct opj_j2k_dec
599 /** locate in which part of the codestream the decoder is (main header, tile header, end) */
602 * store decoding parameters common to all tiles (information like COD, COC in main header)
604 opj_tcp_v2_t *m_default_tcp;
605 OPJ_BYTE *m_header_data;
606 OPJ_UINT32 m_header_data_size;
607 /** to tell the tile part length */
608 OPJ_UINT32 m_sot_length;
609 /** Only tiles index in the correct range will be decoded.*/
610 OPJ_UINT32 m_start_tile_x;
611 OPJ_UINT32 m_start_tile_y;
612 OPJ_UINT32 m_end_tile_x;
613 OPJ_UINT32 m_end_tile_y;
614 /** to tell that a tile can be decoded. */
615 OPJ_UINT32 m_can_decode : 1;
616 OPJ_UINT32 m_discard_tiles : 1;
617 OPJ_UINT32 m_skip_data : 1;
621 typedef struct opj_j2k_enc
623 /** Tile part number, regardless of poc, for each new poc, tp is reset to 1*/
624 OPJ_UINT32 m_current_poc_tile_part_number; // tp_num
626 /** Tile part number currently coding, taking into account POC. m_current_tile_part_number holds the total number of tile parts while encoding the last tile part.*/
627 OPJ_UINT32 m_current_tile_part_number; //cur_tp_num
630 locate the start position of the TLM marker
631 after encoding the tilepart, a jump (in j2k_write_sod) is done to the TLM marker to store the value of its length.
633 OPJ_SIZE_T m_tlm_start;
635 * Stores the sizes of the tlm.
637 OPJ_BYTE * m_tlm_sot_offsets_buffer;
639 * The current offset of the tlm buffer.
641 OPJ_BYTE * m_tlm_sot_offsets_current;
643 /** Total num of tile parts in whole image = num tiles* num tileparts in each tile*/
644 /** used in TLMmarker*/
645 OPJ_UINT32 m_total_tile_parts; // totnum_tp
647 /* encoded data for a tile */
648 OPJ_BYTE * m_encoded_tile_data;
650 /* size of the encoded_data */
651 OPJ_UINT32 m_encoded_tile_size;
653 /* encoded data for a tile */
654 OPJ_BYTE * m_header_tile_data;
656 /* size of the encoded_data */
657 OPJ_UINT32 m_header_tile_data_size;
663 JPEG-2000 codestream reader/writer
665 typedef struct opj_j2k {
667 opj_common_ptr cinfo;
669 /** locate in which part of the codestream the decoder is (main header, tile header, end) */
671 /** number of the tile curently concern by coding/decoding */
673 /** Tile part number*/
675 /** Tilepart number currently coding*/
677 /** Total number of tileparts of the current tile*/
680 locate the start position of the TLM marker
681 after encoding the tilepart, a jump (in j2k_write_sod) is done to the TLM marker to store the value of its length.
684 /** Total num of tile parts in whole image = num tiles* num tileparts in each tile*/
685 /** used in TLMmarker*/
688 locate the position of the end of the tile in the codestream,
689 used to detect a truncated codestream (in j2k_read_sod)
693 locate the start position of the SOT marker of the current coded tile:
694 after encoding the tile, a jump (in j2k_write_sod) is done to the SOT marker to store the value of its length.
699 as the J2K-file is written in several parts during encoding,
700 it enables to make the right correction in position return by cio_tell
703 /** array used to store the data of each tile */
704 unsigned char **tile_data;
705 /** array used to store the length of each tile */
709 store decoding parameters common to all tiles (information like COD, COC in main header)
711 opj_tcp_t *default_tcp;
712 /** pointer to the encoded / decoded image */
714 /** pointer to the coding parameters */
716 /** helper used to write the index file */
717 opj_codestream_info_t *cstr_info;
718 /** pointer to the byte i/o stream */
724 JPEG-2000 codestream reader/writer
726 typedef struct opj_j2k_v2
730 opj_j2k_dec_t m_decoder;
731 opj_j2k_enc_t m_encoder;
735 /** number of the tile curently concern by coding/decoding */
736 OPJ_UINT32 m_current_tile_number;
738 /** pointer to the encoded / decoded image */
739 //opj_image_t *m_image;
740 opj_image_header_t* m_image_header;
742 /** Coding parameters */
745 /** the list of procedures to exec **/
746 struct opj_procedure_list * m_procedure_list;
748 /** the list of validation procedures to follow to make sure the code is valid **/
749 struct opj_procedure_list * m_validation_list;
751 /** helper used to write the index file */
752 opj_codestream_info_t *cstr_info;
754 /** the current tile coder/decoder **/
755 struct opj_tcd_v2 * m_tcd;
756 //opj_tcd_v2_t * m_tcd;
758 OPJ_UINT32 m_is_decoder : 1;
766 /** @name Exported functions */
768 /* ----------------------------------------------------------------------- */
770 Creates a J2K decompression structure
771 @param cinfo Codec context info
772 @return Returns a handle to a J2K decompressor if successful, returns NULL otherwise
774 opj_j2k_t* j2k_create_decompress(opj_common_ptr cinfo);
776 Destroy a J2K decompressor handle
777 @param j2k J2K decompressor handle to destroy
779 void j2k_destroy_decompress(opj_j2k_t *j2k);
781 Setup the decoder decoding parameters using user parameters.
782 Decoding parameters are returned in j2k->cp.
783 @param j2k J2K decompressor handle
784 @param parameters decompression parameters
786 void j2k_setup_decoder(opj_j2k_t *j2k, opj_dparameters_t *parameters);
788 Decode an image from a JPEG-2000 codestream
789 @param j2k J2K decompressor handle
790 @param cio Input buffer stream
791 @param cstr_info Codestream information structure if required, NULL otherwise
792 @return Returns a decoded image if successful, returns NULL otherwise
794 opj_image_t* j2k_decode(opj_j2k_t *j2k, opj_cio_t *cio, opj_codestream_info_t *cstr_info);
796 Decode an image form a JPT-stream (JPEG 2000, JPIP)
797 @param j2k J2K decompressor handle
798 @param cio Input buffer stream
799 @param cstr_info Codestream information structure if required, NULL otherwise
800 @return Returns a decoded image if successful, returns NULL otherwise
802 opj_image_t* j2k_decode_jpt_stream(opj_j2k_t *j2k, opj_cio_t *cio, opj_codestream_info_t *cstr_info);
804 Creates a J2K compression structure
805 @param cinfo Codec context info
806 @return Returns a handle to a J2K compressor if successful, returns NULL otherwise
808 opj_j2k_t* j2k_create_compress(opj_common_ptr cinfo);
810 Destroy a J2K compressor handle
811 @param j2k J2K compressor handle to destroy
813 void j2k_destroy_compress(opj_j2k_t *j2k);
815 Setup the encoder parameters using the current image and using user parameters.
816 Coding parameters are returned in j2k->cp.
817 @param j2k J2K compressor handle
818 @param parameters compression parameters
819 @param image input filled image
821 void j2k_setup_encoder(opj_j2k_t *j2k, opj_cparameters_t *parameters, opj_image_t *image);
823 Converts an enum type progression order to string type
825 char *j2k_convert_progression_order(OPJ_PROG_ORDER prg_order);
827 Encode an image into a JPEG-2000 codestream
828 @param j2k J2K compressor handle
829 @param cio Output buffer stream
830 @param image Image to encode
831 @param cstr_info Codestream information structure if required, NULL otherwise
832 @return Returns true if successful, returns false otherwise
834 opj_bool j2k_encode(opj_j2k_t *j2k, opj_cio_t *cio, opj_image_t *image, opj_codestream_info_t *cstr_info);
836 /* ----------------------------------------------------------------------- */
842 * Ends the decompression procedures and possibiliy add data to be read after the
845 opj_bool j2k_end_decompress(opj_j2k_t *j2k, struct opj_stream_private *cio, struct opj_event_mgr * p_manager);
848 * Reads a jpeg2000 codestream header structure.
850 * @param cio the stream to read data from.
851 * @param p_j2k the jpeg2000 codec.
852 * @param p_manager the user event manager.
854 * @return true if the box is valid.
856 opj_bool j2k_read_header( struct opj_stream_private *p_stream,
858 struct opj_image_header** image_header,
859 struct opj_codestream_info** cstr_info,
860 struct opj_event_mgr* p_manager );
864 * Destroys a jpeg2000 codec.
866 * @param p_j2k the jpeg20000 structure to destroy.
868 void j2k_destroy (opj_j2k_v2_t *p_j2k);
872 * @param p_j2k the jpeg2000 codec.
873 * @param p_stream the stream to write data to.
874 * @param p_manager the user event manager.
876 opj_bool j2k_decode_tile (
877 opj_j2k_v2_t * p_j2k,
878 OPJ_UINT32 p_tile_index,
880 OPJ_UINT32 p_data_size,
881 struct opj_stream_private *p_stream,
882 struct opj_event_mgr * p_manager
886 * Reads a tile header.
887 * @param p_j2k the jpeg2000 codec.
888 * @param p_stream the stream to write data to.
889 * @param p_manager the user event manager.
891 opj_bool j2k_read_tile_header (
892 opj_j2k_v2_t * p_j2k,
893 OPJ_UINT32 * p_tile_index,
894 OPJ_UINT32 * p_data_size,
895 OPJ_INT32 * p_tile_x0,
896 OPJ_INT32 * p_tile_y0,
897 OPJ_INT32 * p_tile_x1,
898 OPJ_INT32 * p_tile_y1,
899 OPJ_UINT32 * p_nb_comps,
901 struct opj_stream_private *p_stream,
902 struct opj_event_mgr * p_manager
907 * Sets the given area to be decoded. This function should be called right after opj_read_header and before any tile header reading.
909 * @param p_j2k the jpeg2000 codec.
910 * @param p_start_x the left position of the rectangle to decode (in image coordinates).
911 * @param p_end_x the right position of the rectangle to decode (in image coordinates).
912 * @param p_start_y the up position of the rectangle to decode (in image coordinates).
913 * @param p_end_y the bottom position of the rectangle to decode (in image coordinates).
914 * @param p_manager the user event manager
916 * @return true if the area could be set.
918 opj_bool j2k_set_decode_area(
924 struct opj_event_mgr * p_manager
928 * Creates a J2K decompression structure.
930 * @return a handle to a J2K decompressor if successful, NULL otherwise.
932 opj_j2k_v2_t* j2k_create_decompress_v2();