/*
- * Copyright (c) 2001-2002, David Janssens
+ * Copyright (c) 2001-2003, David Janssens
* Copyright (c) 2002-2003, Yannick Verschueren
- * Copyright (c) 2002-2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
+ * Copyright (c) 2003-2005, Francois Devaux and Antonin Descampe
+ * Copyright (c) 2005, Hervé Drolon, FreeImage Team
+ * Copyright (c) 2002-2005, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#ifndef __MQC_H
#define __MQC_H
-
-/*
- * Return the number of bytes written/read since initialisation
- */
-int mqc_numbytes();
-
-/*
- * Reset the states of all the context of the coder/decoder
- * (each context is set to a state where 0 and 1 are more or less equiprobable)
- */
-void mqc_resetstates();
-
-/*
- * Set the state of a particular context
- * ctxno: number that identifies the context
- * msb: the MSB of the new state of the context
- * prob: number that identifies the probability of the symbols for the new state of the context
- */
-void mqc_setstate(int ctxno, int msb, int prob);
-
-/*
- * Initialize the encoder
- * bp: pointer to the start of the buffer where the bytes will be written
- */
-void mqc_init_enc(unsigned char *bp);
-
-/*
- * Set the current context used for coding/decoding
- * ctxno: number that identifies the context
- */
-void mqc_setcurctx(int ctxno);
-
-/*
- * Encode a bit
- * d: bit to encode (0 or 1)
- */
-void mqc_encode(int d);
-
-/*
- * Flush the encoder, so that all remaining data is written
- */
-void mqc_flush();
-
-/*
- * BYPASS mode switch
- */
-void mqc_bypass_init_enc();
-
-/*
- * BYPASS mode switch
- */
-void mqc_bypass_enc(int d);
-
-/*
- * BYPASS mode switch
- */
-int mqc_bypass_flush_enc();
-
-/*
- * RESET mode switch
- */
-void mqc_reset_enc();
-
-/*
- * RESTART mode switch (TERMALL)
- */
-int mqc_restart_enc();
-
-/*
- * RESTART mode switch (TERMALL)
- */
-void mqc_restart_init_enc();
-
-/*
- * ERTERM mode switch (PTERM)
- */
-void mqc_erterm_enc();
-
-/*
- * SEGMARK mode switch (SEGSYM)
- */
-void mqc_segmark_enc();
-
-
-/*
- * Initialize the decoder
- * bp: pointer to the start of the buffer from which the bytes will be read
- * len: length of the input buffer
- */
-void mqc_init_dec(unsigned char *bp, int len);
-
-/*
- * Decode a bit (returns 0 or 1)
- */
-int mqc_decode();
-
-#endif
+/**
+@file mqc.h
+@brief Implementation of an MQ-Coder (MQC)
+
+The functions in MQC.C have for goal to realize the MQ-coder operations. The functions
+in MQC.C are used by some function in T1.C.
+*/
+
+/** @defgroup MQC MQC - Implementation of an MQ-Coder */
+/*@{*/
+
+/**
+This struct defines the state of a context.
+*/
+typedef struct opj_mqc_state {
+ /** the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */
+ unsigned int qeval;
+ /** the Most Probable Symbol (0 or 1) */
+ int mps;
+ /** next state if the next encoded symbol is the MPS */
+ struct opj_mqc_state *nmps;
+ /** next state if the next encoded symbol is the LPS */
+ struct opj_mqc_state *nlps;
+} opj_mqc_state_t;
+
+#define MQC_NUMCTXS 32
+
+/**
+MQ coder
+*/
+typedef struct opj_mqc {
+ unsigned int c;
+ unsigned int a;
+ unsigned int ct;
+ unsigned char *bp;
+ unsigned char *start;
+ unsigned char *end;
+ opj_mqc_state_t *ctxs[MQC_NUMCTXS];
+ opj_mqc_state_t **curctx;
+} opj_mqc_t;
+
+/** @name Exported functions */
+/*@{*/
+/* ----------------------------------------------------------------------- */
+/**
+Create a new MQC handle
+@return Returns a new MQC handle if successful, returns NULL otherwise
+*/
+opj_mqc_t* mqc_create();
+/**
+Destroy a previously created MQC handle
+@param mqc MQC handle to destroy
+*/
+void mqc_destroy(opj_mqc_t *mqc);
+/**
+Return the number of bytes written/read since initialisation
+@param mqc MQC handle
+@return Returns the number of bytes already encoded
+*/
+int mqc_numbytes(opj_mqc_t *mqc);
+/**
+Reset the states of all the context of the coder/decoder
+(each context is set to a state where 0 and 1 are more or less equiprobable)
+@param mqc MQC handle
+*/
+void mqc_resetstates(opj_mqc_t *mqc);
+/**
+Set the state of a particular context
+@param mqc MQC handle
+@param ctxno Number that identifies the context
+@param msb The MSB of the new state of the context
+@param prob Number that identifies the probability of the symbols for the new state of the context
+*/
+void mqc_setstate(opj_mqc_t *mqc, int ctxno, int msb, int prob);
+/**
+Initialize the encoder
+@param mqc MQC handle
+@param bp Pointer to the start of the buffer where the bytes will be written
+*/
+void mqc_init_enc(opj_mqc_t *mqc, unsigned char *bp);
+/**
+Set the current context used for coding/decoding
+@param mqc MQC handle
+@param ctxno Number that identifies the context
+*/
+void mqc_setcurctx(opj_mqc_t *mqc, int ctxno);
+/**
+Encode a symbol using the MQ-coder
+@param mqc MQC handle
+@param d The symbol to be encoded (0 or 1)
+*/
+void mqc_encode(opj_mqc_t *mqc, int d);
+/**
+Flush the encoder, so that all remaining data is written
+@param mqc MQC handle
+*/
+void mqc_flush(opj_mqc_t *mqc);
+/**
+BYPASS mode switch, initialization operation.
+JPEG 2000 p 505.
+<h2>Not fully implemented and tested !!</h2>
+@param mqc MQC handle
+*/
+void mqc_bypass_init_enc(opj_mqc_t *mqc);
+/**
+BYPASS mode switch, coding operation.
+JPEG 2000 p 505.
+<h2>Not fully implemented and tested !!</h2>
+@param mqc MQC handle
+@param d The symbol to be encoded (0 or 1)
+*/
+void mqc_bypass_enc(opj_mqc_t *mqc, int d);
+/**
+BYPASS mode switch, flush operation
+<h2>Not fully implemented and tested !!</h2>
+@param mqc MQC handle
+@return Returns 1 (always)
+*/
+int mqc_bypass_flush_enc(opj_mqc_t *mqc);
+/**
+RESET mode switch
+@param mqc MQC handle
+*/
+void mqc_reset_enc(opj_mqc_t *mqc);
+/**
+RESTART mode switch (TERMALL)
+@param mqc MQC handle
+@return Returns 1 (always)
+*/
+int mqc_restart_enc(opj_mqc_t *mqc);
+/**
+RESTART mode switch (TERMALL) reinitialisation
+@param mqc MQC handle
+*/
+void mqc_restart_init_enc(opj_mqc_t *mqc);
+/**
+ERTERM mode switch (PTERM)
+@param mqc MQC handle
+*/
+void mqc_erterm_enc(opj_mqc_t *mqc);
+/**
+SEGMARK mode switch (SEGSYM)
+@param mqc MQC handle
+*/
+void mqc_segmark_enc(opj_mqc_t *mqc);
+/**
+Initialize the decoder
+@param mqc MQC handle
+@param bp Pointer to the start of the buffer from which the bytes will be read
+@param len Length of the input buffer
+*/
+void mqc_init_dec(opj_mqc_t *mqc, unsigned char *bp, int len);
+/**
+Decode a symbol
+@param mqc MQC handle
+@return Returns the decoded symbol (0 or 1)
+*/
+int mqc_decode(opj_mqc_t *mqc);
+/* ----------------------------------------------------------------------- */
+/*@}*/
+
+/*@}*/
+
+#endif /* __MQC_H */
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