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38 @brief The JPEG-2000 file format Reader/Writer (JP2)
42 /** @defgroup JP2 JP2 - JPEG-2000 file format reader/writer */
45 #define JP2_JP 0x6a502020 /**< JPEG 2000 signature box */
46 #define JP2_FTYP 0x66747970 /**< File type box */
47 #define JP2_JP2H 0x6a703268 /**< JP2 header box */
48 #define JP2_IHDR 0x69686472 /**< Image header box */
49 #define JP2_COLR 0x636f6c72 /**< Colour specification box */
50 #define JP2_JP2C 0x6a703263 /**< Contiguous codestream box */
51 #define JP2_URL 0x75726c20 /**< URL box */
52 #define JP2_DTBL 0x6474626c /**< Data Reference box */
53 #define JP2_BPCC 0x62706363 /**< Bits per component box */
54 #define JP2_JP2 0x6a703220 /**< File type fields */
55 #define JP2_PCLR 0x70636c72 /**< Palette box */
56 #define JP2_CMAP 0x636d6170 /**< Component Mapping box */
57 #define JP2_CDEF 0x63646566 /**< Channel Definition box */
59 /* ----------------------------------------------------------------------- */
61 Channel description: channel index, type, association
63 typedef struct opj_jp2_cdef_info
65 unsigned short cn, typ, asoc;
66 } opj_jp2_cdef_info_t;
69 Channel descriptions and number of descriptions
71 typedef struct opj_jp2_cdef
73 opj_jp2_cdef_info_t *info;
78 Component mappings: channel index, mapping type, palette index
80 typedef struct opj_jp2_cmap_comp
83 unsigned char mtyp, pcol;
84 } opj_jp2_cmap_comp_t;
87 Palette data: table entries, palette columns
89 typedef struct opj_jp2_pclr
91 unsigned int *entries;
92 unsigned char *channel_sign;
93 unsigned char *channel_size;
94 opj_jp2_cmap_comp_t *cmap;
95 unsigned short nr_entries, nr_channels;
99 Collector for ICC profile, palette, component mapping, channel description
101 typedef struct opj_jp2_color
103 unsigned char *icc_profile_buf;
106 opj_jp2_cdef_t *jp2_cdef;
107 opj_jp2_pclr_t *jp2_pclr;
108 unsigned char jp2_has_colr;
114 typedef struct opj_jp2_comps {
121 JPEG-2000 file format reader/writer
123 typedef struct opj_jp2 {
125 opj_common_ptr cinfo;
126 /** handle to the J2K codec */
130 unsigned int numcomps;
138 unsigned int precedence;
140 unsigned int minversion;
143 opj_jp2_comps_t *comps;
144 unsigned int j2k_codestream_offset;
145 unsigned int j2k_codestream_length;
146 opj_bool ignore_pclr_cmap_cdef;
152 typedef struct opj_jp2_box {
158 /** @name Exported functions */
160 /* ----------------------------------------------------------------------- */
162 Write the JP2H box - JP2 Header box (used in MJ2)
163 @param jp2 JP2 handle
164 @param cio Output buffer stream
166 void jp2_write_jp2h(opj_jp2_t *jp2, opj_cio_t *cio);
168 Read the JP2H box - JP2 Header box (used in MJ2)
169 @param jp2 JP2 handle
170 @param cio Input buffer stream
171 @param ext Collector for profile, cdef and pclr data
172 @return Returns true if successful, returns false otherwise
174 opj_bool jp2_read_jp2h(opj_jp2_t *jp2, opj_cio_t *cio, opj_jp2_color_t *color);
176 Creates a JP2 decompression structure
177 @param cinfo Codec context info
178 @return Returns a handle to a JP2 decompressor if successful, returns NULL otherwise
180 opj_jp2_t* jp2_create_decompress(opj_common_ptr cinfo);
182 Destroy a JP2 decompressor handle
183 @param jp2 JP2 decompressor handle to destroy
185 void jp2_destroy_decompress(opj_jp2_t *jp2);
187 Setup the decoder decoding parameters using user parameters.
188 Decoding parameters are returned in jp2->j2k->cp.
189 @param jp2 JP2 decompressor handle
190 @param parameters decompression parameters
192 void jp2_setup_decoder(opj_jp2_t *jp2, opj_dparameters_t *parameters);
194 Decode an image from a JPEG-2000 file stream
195 @param jp2 JP2 decompressor handle
196 @param cio Input buffer stream
197 @param cstr_info Codestream information structure if required, NULL otherwise
198 @return Returns a decoded image if successful, returns NULL otherwise
200 opj_image_t* opj_jp2_decode(opj_jp2_t *jp2, opj_cio_t *cio, opj_codestream_info_t *cstr_info);
202 Creates a JP2 compression structure
203 @param cinfo Codec context info
204 @return Returns a handle to a JP2 compressor if successful, returns NULL otherwise
206 opj_jp2_t* jp2_create_compress(opj_common_ptr cinfo);
208 Destroy a JP2 compressor handle
209 @param jp2 JP2 compressor handle to destroy
211 void jp2_destroy_compress(opj_jp2_t *jp2);
213 Setup the encoder parameters using the current image and using user parameters.
214 Coding parameters are returned in jp2->j2k->cp.
215 @param jp2 JP2 compressor handle
216 @param parameters compression parameters
217 @param image input filled image
219 void jp2_setup_encoder(opj_jp2_t *jp2, opj_cparameters_t *parameters, opj_image_t *image);
221 Encode an image into a JPEG-2000 file stream
222 @param jp2 JP2 compressor handle
223 @param cio Output buffer stream
224 @param image Image to encode
225 @param cstr_info Codestream information structure if required, NULL otherwise
226 @return Returns true if successful, returns false otherwise
228 opj_bool opj_jp2_encode(opj_jp2_t *jp2, opj_cio_t *cio, opj_image_t *image, opj_codestream_info_t *cstr_info);
230 /* ----------------------------------------------------------------------- */