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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 (usefull for progression order change) */
78 /** layer step used to localize the packet in the include vector */
80 /** resolution step used to localize the packet in the include vector */
82 /** component step used to localize the packet in the include vector */
84 /** precinct step used to localize the packet in the include vector */
86 /** component that identify the packet */
88 /** resolution that identify the packet */
90 /** precinct that identify the packet */
92 /** layer that identify the packet */
94 /** 0 if the first packet */
96 /** progression order change information */
98 /** number of components in the image */
101 opj_pi_comp_t *comps;
103 OPJ_INT32 tx0, ty0, tx1, ty1;
110 /** @name Exported functions */
112 /* ----------------------------------------------------------------------- */
114 * Creates a packet iterator for encoding.
116 * @param image the image being encoded.
117 * @param cp the coding parameters.
118 * @param tileno index of the tile being encoded.
119 * @param t2_mode the type of pass for generating the packet iterator
121 * @return a list of packet iterator that points to the first packet of the tile (not true).
123 opj_pi_iterator_t *opj_pi_initialise_encode(const opj_image_t *image,
126 J2K_T2_MODE t2_mode);
129 * Updates the encoding parameters of the codec.
131 * @param p_image the image being encoded.
132 * @param p_cp the coding parameters.
133 * @param p_tile_no index of the tile being encoded.
135 void opj_pi_update_encoding_parameters( const opj_image_t *p_image,
137 OPJ_UINT32 p_tile_no );
140 Modify the packet iterator for enabling tile part generation
141 @param pi Handle to the packet iterator generated in pi_initialise_encode
142 @param cp Coding parameters
143 @param tileno Number that identifies the tile for which to list the packets
144 @param pino FIXME DOC
145 @param tpnum Tile part number of the current tile
146 @param tppos The position of the tile part flag in the progression order
147 @param t2_mode FIXME DOC
149 void opj_pi_create_encode( opj_pi_iterator_t *pi,
155 J2K_T2_MODE t2_mode);
158 Create a packet iterator for Decoder
159 @param image Raw image for which the packets will be listed
160 @param cp Coding parameters
161 @param tileno Number that identifies the tile for which to list the packets
162 @return Returns a packet iterator that points to the first packet of the tile
165 opj_pi_iterator_t *opj_pi_create_decode(opj_image_t * image,
169 * Destroys a packet iterator array.
171 * @param p_pi the packet iterator array to destroy.
172 * @param p_nb_elements the number of elements in the array.
174 void opj_pi_destroy(opj_pi_iterator_t *p_pi,
175 OPJ_UINT32 p_nb_elements);
178 Modify the packet iterator to point to the next packet
179 @param pi Packet iterator to modify
180 @return Returns false if pi pointed to the last packet or else returns true
182 OPJ_BOOL opj_pi_next(opj_pi_iterator_t * pi);
183 /* ----------------------------------------------------------------------- */