2 * Copyright (c) 2001-2003, David Janssens
3 * Copyright (c) 2002-2003, Yannick Verschueren
4 * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
5 * Copyright (c) 2005, Herv� Drolon, FreeImage Team
6 * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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35 @brief Implementation of a tier-2 coding (packetization of code-block data) (T2)
39 /** @defgroup T2 T2 - Implementation of a tier-2 coding */
45 typedef struct opj_t2 {
49 /** Encoding: pointer to the src image. Decoding: pointer to the dst image. */
51 /** pointer to the image coding parameters */
55 /** @name Local static functions */
57 /* ----------------------------------------------------------------------- */
59 static void t2_putcommacode(opj_bio_t *bio, int n);
60 static int t2_getcommacode(opj_bio_t *bio);
62 Variable length code for signalling delta Zil (truncation point)
63 @param bio Bit Input/Output component
66 static void t2_putnumpasses(opj_bio_t *bio, int n);
67 static int t2_getnumpasses(opj_bio_t *bio);
69 Encode a packet of a tile to a destination buffer
71 @param tile Tile for which to write the packets
72 @param tcp Tile coding parameters
73 @param pi Packet identity
74 @param dest Destination buffer
75 @param len Length of the destination buffer
76 @param image_info Structure to create an index file
77 @param tileno Number of the tile encoded
80 static int t2_encode_packet(opj_t2_t* t2, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi, unsigned char *dest, int len, opj_image_info_t *image_info, int tileno);
86 static void t2_init_seg(opj_tcd_seg_t *seg, int cblksty, int first);
88 Decode a packet of a tile from a source buffer
90 @param src Source buffer
91 @param len Length of the source buffer
92 @param tile Tile for which to write the packets
93 @param tcp Tile coding parameters
94 @param pi Packet identity
97 int t2_decode_packet(opj_t2_t* t2, unsigned char *src, int len, opj_tcd_tile_t *tile, opj_tcp_t *tcp, opj_pi_iterator_t *pi);
99 /* ----------------------------------------------------------------------- */
102 /** @name Exported functions */
104 /* ----------------------------------------------------------------------- */
107 Encode the packets of a tile to a destination buffer
109 @param tileno number of the tile encoded
110 @param tile the tile for which to write the packets
111 @param maxlayers maximum number of layers
112 @param dest the destination buffer
113 @param len the length of the destination buffer
114 @param image_info structure to create an index file
116 int t2_encode_packets(opj_t2_t* t2, int tileno, opj_tcd_tile_t *tile, int maxlayers, unsigned char *dest, int len, opj_image_info_t *image_info);
119 Decode the packets of a tile from a source buffer
121 @param src the source buffer
122 @param len length of the source buffer
123 @param tileno number that identifies the tile for which to decode the packets
124 @param tile tile for which to decode the packets
126 int t2_decode_packets(opj_t2_t *t2, unsigned char *src, int len, int tileno, opj_tcd_tile_t *tile);
130 @param cinfo Codec context info
131 @param image Source or destination image
132 @param cp Image coding parameters
133 @return Returns a new T2 handle if successful, returns NULL otherwise
135 opj_t2_t* t2_create(opj_common_ptr cinfo, opj_image_t *image, opj_cp_t *cp);
138 @param t2 T2 handle to destroy
140 void t2_destroy(opj_t2_t *t2);
142 /* ----------------------------------------------------------------------- */