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42 @brief Implementation of a packet iterator (PI)
44 The functions in PI.C have for goal to realize a packet iterator that permits to get the next
45 packet following the progression order and change of it. The functions in PI.C are used
46 by some function in T2.C.
49 /** @defgroup PI PI - Implementation of a packet iterator */
55 typedef struct opj_pi_resolution {
58 } opj_pi_resolution_t;
63 typedef struct opj_pi_comp {
65 /** number of resolution levels */
66 OPJ_UINT32 numresolutions;
67 opj_pi_resolution_t *resolutions;
73 typedef struct opj_pi_iterator {
74 /** Enabling Tile part generation*/
76 /** precise if the packet has been already used (useful for progression order change) */
78 /** Number of elements in include array */
79 OPJ_UINT32 include_size;
80 /** layer step used to localize the packet in the include vector */
82 /** resolution step used to localize the packet in the include vector */
84 /** component step used to localize the packet in the include vector */
86 /** precinct step used to localize the packet in the include vector */
88 /** component that identify the packet */
90 /** resolution that identify the packet */
92 /** precinct that identify the packet */
94 /** layer that identify the packet */
96 /** 0 if the first packet */
98 /** progression order change information */
100 /** number of components in the image */
103 opj_pi_comp_t *comps;
105 OPJ_UINT32 tx0, ty0, tx1, ty1;
111 opj_event_mgr_t* manager;
114 /** @name Exported functions */
116 /* ----------------------------------------------------------------------- */
118 * Creates a packet iterator for encoding.
120 * @param image the image being encoded.
121 * @param cp the coding parameters.
122 * @param tileno index of the tile being encoded.
123 * @param t2_mode the type of pass for generating the packet iterator
124 * @param manager Event manager
126 * @return a list of packet iterator that points to the first packet of the tile (not true).
128 opj_pi_iterator_t *opj_pi_initialise_encode(const opj_image_t *image,
132 opj_event_mgr_t* manager);
135 * Updates the encoding parameters of the codec.
137 * @param p_image the image being encoded.
138 * @param p_cp the coding parameters.
139 * @param p_tile_no index of the tile being encoded.
141 void opj_pi_update_encoding_parameters(const opj_image_t *p_image,
143 OPJ_UINT32 p_tile_no);
146 Modify the packet iterator for enabling tile part generation
147 @param pi Handle to the packet iterator generated in pi_initialise_encode
148 @param cp Coding parameters
149 @param tileno Number that identifies the tile for which to list the packets
150 @param pino FIXME DOC
151 @param tpnum Tile part number of the current tile
152 @param tppos The position of the tile part flag in the progression order
153 @param t2_mode FIXME DOC
155 void opj_pi_create_encode(opj_pi_iterator_t *pi,
161 J2K_T2_MODE t2_mode);
164 Create a packet iterator for Decoder
165 @param image Raw image for which the packets will be listed
166 @param cp Coding parameters
167 @param tileno Number that identifies the tile for which to list the packets
168 @param manager Event manager
169 @return Returns a packet iterator that points to the first packet of the tile
172 opj_pi_iterator_t *opj_pi_create_decode(opj_image_t * image,
175 opj_event_mgr_t* manager);
177 * Destroys a packet iterator array.
179 * @param p_pi the packet iterator array to destroy.
180 * @param p_nb_elements the number of elements in the array.
182 void opj_pi_destroy(opj_pi_iterator_t *p_pi,
183 OPJ_UINT32 p_nb_elements);
186 Modify the packet iterator to point to the next packet
187 @param pi Packet iterator to modify
188 @return Returns false if pi pointed to the last packet or else returns true
190 OPJ_BOOL opj_pi_next(opj_pi_iterator_t * pi);
193 * Return the number of packets in the tile.
194 * @param image the image being encoded.
195 * @param cp Coding parameters
196 * @param tileno Number that identifies the tile.
198 OPJ_UINT32 opj_get_encoding_packet_count(const opj_image_t *p_image,
199 const opj_cp_t *p_cp,
200 OPJ_UINT32 p_tile_no);
202 /* ----------------------------------------------------------------------- */
207 #endif /* OPJ_PI_H */