/* * Copyright (c) 1999-2000 Image Power, Inc. and the University of * British Columbia. * Copyright (c) 2001-2002 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 Encoder * * $Id: jpc_mqenc.h,v 1.1 2008/10/17 06:15:00 scuri Exp $ */ #ifndef JPC_MQENC_H #define JPC_MQENC_H /******************************************************************************\ * Includes. \******************************************************************************/ #include "jasper/jas_types.h" #include "jasper/jas_stream.h" #include "jpc_mqcod.h" /******************************************************************************\ * Constants. \******************************************************************************/ /* * Termination modes. */ #define JPC_MQENC_DEFTERM 0 /* default termination */ #define JPC_MQENC_PTERM 1 /* predictable termination */ /******************************************************************************\ * Types. \******************************************************************************/ /* MQ arithmetic encoder class. */ typedef struct { /* The C register. */ uint_fast32_t creg; /* The A register. */ uint_fast32_t areg; /* The CT register. */ uint_fast32_t ctreg; /* The maximum number of contexts. */ int maxctxs; /* The per-context information. */ jpc_mqstate_t **ctxs; /* The current context. */ jpc_mqstate_t **curctx; /* The stream for encoder output. */ jas_stream_t *out; /* The byte buffer (i.e., the B variable in the standard). */ int_fast16_t outbuf; /* The last byte output. */ int_fast16_t lastbyte; /* The error indicator. */ int err; } jpc_mqenc_t; /* MQ arithmetic encoder state information. */ typedef struct { /* The A register. */ unsigned areg; /* The C register. */ unsigned creg; /* The CT register. */ unsigned ctreg; /* The last byte output by the encoder. */ int lastbyte; } jpc_mqencstate_t; /******************************************************************************\ * Functions/macros for construction and destruction. \******************************************************************************/ /* Create a MQ encoder. */ jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out); /* Destroy a MQ encoder. */ void jpc_mqenc_destroy(jpc_mqenc_t *enc); /******************************************************************************\ * Functions/macros for initialization. \******************************************************************************/ /* Initialize a MQ encoder. */ void jpc_mqenc_init(jpc_mqenc_t *enc); /******************************************************************************\ * Functions/macros for context manipulation. \******************************************************************************/ /* Set the current context. */ #define jpc_mqenc_setcurctx(enc, ctxno) \ ((enc)->curctx = &(enc)->ctxs[ctxno]); /* Set the state information for a particular context. */ void jpc_mqenc_setctx(jpc_mqenc_t *enc, int ctxno, jpc_mqctx_t *ctx); /* Set the state information for multiple contexts. */ void jpc_mqenc_setctxs(jpc_mqenc_t *enc, int numctxs, jpc_mqctx_t *ctxs); /******************************************************************************\ * Miscellaneous functions/macros. \******************************************************************************/ /* Get the error state of a MQ encoder. */ #define jpc_mqenc_error(enc) \ ((enc)->err) /* Get the current encoder state. */ void jpc_mqenc_getstate(jpc_mqenc_t *enc, jpc_mqencstate_t *state); /* Terminate the code. */ int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode); /******************************************************************************\ * Functions/macros for encoding bits. \******************************************************************************/ /* Encode a bit. */ #if !defined(DEBUG) #define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_macro(enc, bit) #else #define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_func(enc, bit) #endif /******************************************************************************\ * Functions/macros for debugging. \******************************************************************************/ int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out); /******************************************************************************\ * Implementation-specific details. \******************************************************************************/ /* Note: This macro is included only to satisfy the needs of the mqenc_putbit macro. */ #define jpc_mqenc_putbit_macro(enc, bit) \ (((*((enc)->curctx))->mps == (bit)) ? \ (((enc)->areg -= (*(enc)->curctx)->qeval), \ ((!((enc)->areg & 0x8000)) ? (jpc_mqenc_codemps2(enc)) : \ ((enc)->creg += (*(enc)->curctx)->qeval))) : \ jpc_mqenc_codelps(enc)) /* Note: These function prototypes are included only to satisfy the needs of the mqenc_putbit_macro macro. Do not call any of these functions directly. */ int jpc_mqenc_codemps2(jpc_mqenc_t *enc); int jpc_mqenc_codelps(jpc_mqenc_t *enc); /* Note: This function prototype is included only to satisfy the needs of the mqenc_putbit macro. */ int jpc_mqenc_putbit_func(jpc_mqenc_t *enc, int bit); #endif