--- /dev/null
+/*
+ * Copyright (c) 1999-2000 Image Power, Inc. and the University of
+ * British Columbia.
+ * Copyright (c) 2001-2003 Michael David Adams.
+ * All rights reserved.
+ */
+
+/* __START_OF_JASPER_LICENSE__
+ *
+ * JasPer License Version 2.0
+ *
+ * Copyright (c) 2001-2006 Michael David Adams
+ * Copyright (c) 1999-2000 Image Power, Inc.
+ * Copyright (c) 1999-2000 The University of British Columbia
+ *
+ * All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person (the
+ * "User") obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge,
+ * publish, distribute, and/or sell copies of the Software, and to permit
+ * persons to whom the Software is furnished to do so, subject to the
+ * following conditions:
+ *
+ * 1. The above copyright notices and this permission notice (which
+ * includes the disclaimer below) shall be included in all copies or
+ * substantial portions of the Software.
+ *
+ * 2. The name of a copyright holder shall not be used to endorse or
+ * promote products derived from the Software without specific prior
+ * written permission.
+ *
+ * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
+ * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
+ * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
+ * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
+ * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
+ * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
+ * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
+ * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
+ * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
+ * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
+ * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
+ * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
+ * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
+ * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
+ * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
+ * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
+ * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
+ * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
+ * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
+ * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
+ * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
+ * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
+ * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
+ * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
+ *
+ * __END_OF_JASPER_LICENSE__
+ */
+
+/*
+ * MQ Arithmetic Decoder
+ *
+ * $Id: jpc_mqdec.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $
+ */
+
+#ifndef JPC_MQDEC_H
+#define JPC_MQDEC_H
+
+/******************************************************************************\
+* Includes.
+\******************************************************************************/
+
+#include "jasper/jas_types.h"
+#include "jasper/jas_stream.h"
+
+#include "jpc_mqcod.h"
+
+/******************************************************************************\
+* Types.
+\******************************************************************************/
+
+/* MQ arithmetic decoder. */
+
+typedef struct {
+
+ /* The C register. */
+ uint_fast32_t creg;
+
+ /* The A register. */
+ uint_fast32_t areg;
+
+ /* The CT register. */
+ uint_fast32_t ctreg;
+
+ /* The current context. */
+ jpc_mqstate_t **curctx;
+
+ /* The per-context information. */
+ jpc_mqstate_t **ctxs;
+
+ /* The maximum number of contexts. */
+ int maxctxs;
+
+ /* The stream from which to read data. */
+ jas_stream_t *in;
+
+ /* The last character read. */
+ uchar inbuffer;
+
+ /* The EOF indicator. */
+ int eof;
+
+} jpc_mqdec_t;
+
+/******************************************************************************\
+* Functions/macros for construction and destruction.
+\******************************************************************************/
+
+/* Create a MQ decoder. */
+jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in);
+
+/* Destroy a MQ decoder. */
+void jpc_mqdec_destroy(jpc_mqdec_t *dec);
+
+/******************************************************************************\
+* Functions/macros for initialization.
+\******************************************************************************/
+
+/* Set the input stream associated with a MQ decoder. */
+void jpc_mqdec_setinput(jpc_mqdec_t *dec, jas_stream_t *in);
+
+/* Initialize a MQ decoder. */
+void jpc_mqdec_init(jpc_mqdec_t *dec);
+
+/******************************************************************************\
+* Functions/macros for manipulating contexts.
+\******************************************************************************/
+
+/* Set the current context for a MQ decoder. */
+#define jpc_mqdec_setcurctx(dec, ctxno) \
+ ((mqdec)->curctx = &(mqdec)->ctxs[ctxno]);
+
+/* Set the state information for a particular context of a MQ decoder. */
+void jpc_mqdec_setctx(jpc_mqdec_t *dec, int ctxno, jpc_mqctx_t *ctx);
+
+/* Set the state information for all contexts of a MQ decoder. */
+void jpc_mqdec_setctxs(jpc_mqdec_t *dec, int numctxs, jpc_mqctx_t *ctxs);
+
+/******************************************************************************\
+* Functions/macros for decoding bits.
+\******************************************************************************/
+
+/* Decode a symbol. */
+#if !defined(DEBUG)
+#define jpc_mqdec_getbit(dec) \
+ jpc_mqdec_getbit_macro(dec)
+#else
+#define jpc_mqdec_getbit(dec) \
+ jpc_mqdec_getbit_func(dec)
+#endif
+
+/* Decode a symbol (assuming an unskewed probability distribution). */
+#if !defined(DEBUG)
+#define jpc_mqdec_getbitnoskew(dec) \
+ jpc_mqdec_getbit_macro(dec)
+#else
+#define jpc_mqdec_getbitnoskew(dec) \
+ jpc_mqdec_getbit_func(dec)
+#endif
+
+/******************************************************************************\
+* Functions/macros for debugging.
+\******************************************************************************/
+
+/* Dump the MQ decoder state for debugging. */
+void jpc_mqdec_dump(jpc_mqdec_t *dec, FILE *out);
+
+/******************************************************************************\
+* EVERYTHING BELOW THIS POINT IS IMPLEMENTATION SPECIFIC AND NOT PART OF THE
+* APPLICATION INTERFACE. DO NOT RELY ON ANY OF THE INTERNAL FUNCTIONS/MACROS
+* GIVEN BELOW.
+\******************************************************************************/
+
+#define jpc_mqdec_getbit_macro(dec) \
+ ((((dec)->areg -= (*(dec)->curctx)->qeval), \
+ (dec)->creg >> 16 >= (*(dec)->curctx)->qeval) ? \
+ ((((dec)->creg -= (*(dec)->curctx)->qeval << 16), \
+ (dec)->areg & 0x8000) ? (*(dec)->curctx)->mps : \
+ jpc_mqdec_mpsexchrenormd(dec)) : \
+ jpc_mqdec_lpsexchrenormd(dec))
+
+#define jpc_mqdec_mpsexchange(areg, delta, curctx, bit) \
+{ \
+ if ((areg) < (delta)) { \
+ register jpc_mqstate_t *state = *(curctx); \
+ /* LPS decoded. */ \
+ (bit) = state->mps ^ 1; \
+ *(curctx) = state->nlps; \
+ } else { \
+ register jpc_mqstate_t *state = *(curctx); \
+ /* MPS decoded. */ \
+ (bit) = state->mps; \
+ *(curctx) = state->nmps; \
+ } \
+}
+
+#define jpc_mqdec_lpsexchange(areg, delta, curctx, bit) \
+{ \
+ if ((areg) >= (delta)) { \
+ register jpc_mqstate_t *state = *(curctx); \
+ (areg) = (delta); \
+ (bit) = state->mps ^ 1; \
+ *(curctx) = state->nlps; \
+ } else { \
+ register jpc_mqstate_t *state = *(curctx); \
+ (areg) = (delta); \
+ (bit) = state->mps; \
+ *(curctx) = state->nmps; \
+ } \
+}
+
+#define jpc_mqdec_renormd(areg, creg, ctreg, in, eof, inbuf) \
+{ \
+ do { \
+ if (!(ctreg)) { \
+ jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf); \
+ } \
+ (areg) <<= 1; \
+ (creg) <<= 1; \
+ --(ctreg); \
+ } while (!((areg) & 0x8000)); \
+}
+
+#define jpc_mqdec_bytein2(creg, ctreg, in, eof, inbuf) \
+{ \
+ int c; \
+ unsigned char prevbuf; \
+ if (!(eof)) { \
+ if ((c = jas_stream_getc(in)) == EOF) { \
+ (eof) = 1; \
+ c = 0xff; \
+ } \
+ prevbuf = (inbuf); \
+ (inbuf) = c; \
+ if (prevbuf == 0xff) { \
+ if (c > 0x8f) { \
+ (creg) += 0xff00; \
+ (ctreg) = 8; \
+ } else { \
+ (creg) += c << 9; \
+ (ctreg) = 7; \
+ } \
+ } else { \
+ (creg) += c << 8; \
+ (ctreg) = 8; \
+ } \
+ } else { \
+ (creg) += 0xff00; \
+ (ctreg) = 8; \
+ } \
+}
+
+int jpc_mqdec_getbit_func(jpc_mqdec_t *dec);
+int jpc_mqdec_mpsexchrenormd(jpc_mqdec_t *dec);
+int jpc_mqdec_lpsexchrenormd(jpc_mqdec_t *dec);
+
+#endif
projects / opencv / blobdiff