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43 @brief Implementation of an MQ-Coder (MQC)
45 The functions in MQC.C have for goal to realize the MQ-coder operations. The functions
46 in MQC.C are used by some function in T1.C.
49 /** @defgroup MQC MQC - Implementation of an MQ-Coder */
53 This struct defines the state of a context.
55 typedef struct opj_mqc_state {
56 /** the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */
58 /** the Most Probable Symbol (0 or 1) */
60 /** next state if the next encoded symbol is the MPS */
61 struct opj_mqc_state *nmps;
62 /** next state if the next encoded symbol is the LPS */
63 struct opj_mqc_state *nlps;
66 #define MQC_NUMCTXS 19
71 typedef struct opj_mqc {
78 opj_mqc_state_t *ctxs[MQC_NUMCTXS];
79 opj_mqc_state_t **curctx;
81 unsigned char *buffer;
85 /** @name Exported functions */
87 /* ----------------------------------------------------------------------- */
89 Create a new MQC handle
90 @return Returns a new MQC handle if successful, returns NULL otherwise
92 opj_mqc_t* opj_mqc_create(void);
94 Destroy a previously created MQC handle
95 @param mqc MQC handle to destroy
97 void opj_mqc_destroy(opj_mqc_t *mqc);
99 Return the number of bytes written/read since initialisation
100 @param mqc MQC handle
101 @return Returns the number of bytes already encoded
103 OPJ_UINT32 opj_mqc_numbytes(opj_mqc_t *mqc);
105 Reset the states of all the context of the coder/decoder
106 (each context is set to a state where 0 and 1 are more or less equiprobable)
107 @param mqc MQC handle
109 void opj_mqc_resetstates(opj_mqc_t *mqc);
111 Set the state of a particular context
112 @param mqc MQC handle
113 @param ctxno Number that identifies the context
114 @param msb The MSB of the new state of the context
115 @param prob Number that identifies the probability of the symbols for the new state of the context
117 void opj_mqc_setstate(opj_mqc_t *mqc, OPJ_UINT32 ctxno, OPJ_UINT32 msb, OPJ_INT32 prob);
119 Initialize the encoder
120 @param mqc MQC handle
121 @param bp Pointer to the start of the buffer where the bytes will be written
123 void opj_mqc_init_enc(opj_mqc_t *mqc, OPJ_BYTE *bp);
125 Set the current context used for coding/decoding
126 @param mqc MQC handle
127 @param ctxno Number that identifies the context
129 #define opj_mqc_setcurctx(mqc, ctxno) (mqc)->curctx = &(mqc)->ctxs[(OPJ_UINT32)(ctxno)]
131 Encode a symbol using the MQ-coder
132 @param mqc MQC handle
133 @param d The symbol to be encoded (0 or 1)
135 void opj_mqc_encode(opj_mqc_t *mqc, OPJ_UINT32 d);
137 Flush the encoder, so that all remaining data is written
138 @param mqc MQC handle
140 void opj_mqc_flush(opj_mqc_t *mqc);
142 BYPASS mode switch, initialization operation.
144 <h2>Not fully implemented and tested !!</h2>
145 @param mqc MQC handle
147 void opj_mqc_bypass_init_enc(opj_mqc_t *mqc);
149 BYPASS mode switch, coding operation.
151 <h2>Not fully implemented and tested !!</h2>
152 @param mqc MQC handle
153 @param d The symbol to be encoded (0 or 1)
155 void opj_mqc_bypass_enc(opj_mqc_t *mqc, OPJ_UINT32 d);
157 BYPASS mode switch, flush operation
158 <h2>Not fully implemented and tested !!</h2>
159 @param mqc MQC handle
160 @return Returns 1 (always)
162 OPJ_UINT32 opj_mqc_bypass_flush_enc(opj_mqc_t *mqc);
165 @param mqc MQC handle
167 void opj_mqc_reset_enc(opj_mqc_t *mqc);
169 RESTART mode switch (TERMALL)
170 @param mqc MQC handle
171 @return Returns 1 (always)
173 OPJ_UINT32 opj_mqc_restart_enc(opj_mqc_t *mqc);
175 RESTART mode switch (TERMALL) reinitialisation
176 @param mqc MQC handle
178 void opj_mqc_restart_init_enc(opj_mqc_t *mqc);
180 ERTERM mode switch (PTERM)
181 @param mqc MQC handle
183 void opj_mqc_erterm_enc(opj_mqc_t *mqc);
185 SEGMARK mode switch (SEGSYM)
186 @param mqc MQC handle
188 void opj_mqc_segmark_enc(opj_mqc_t *mqc);
190 Initialize the decoder
191 @param mqc MQC handle
192 @param bp Pointer to the start of the buffer from which the bytes will be read
193 @param len Length of the input buffer
195 OPJ_BOOL opj_mqc_init_dec(opj_mqc_t *mqc, OPJ_BYTE *bp, OPJ_UINT32 len);
198 @param mqc MQC handle
199 @return Returns the decoded symbol (0 or 1)
201 OPJ_INT32 opj_mqc_decode(opj_mqc_t * const mqc);
202 /* ----------------------------------------------------------------------- */