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236 lines
8.1 KiB
236 lines
8.1 KiB
/* |
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* Copyright (c) 1999-2000 Image Power, Inc. and the University of |
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* British Columbia. |
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* Copyright (c) 2001-2002 Michael David Adams. |
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* All rights reserved. |
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*/ |
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/* __START_OF_JASPER_LICENSE__ |
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* |
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* JasPer License Version 2.0 |
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* |
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* Copyright (c) 2001-2006 Michael David Adams |
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* Copyright (c) 1999-2000 Image Power, Inc. |
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* Copyright (c) 1999-2000 The University of British Columbia |
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* |
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* All rights reserved. |
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* |
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* Permission is hereby granted, free of charge, to any person (the |
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* "User") obtaining a copy of this software and associated documentation |
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* files (the "Software"), to deal in the Software without restriction, |
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* including without limitation the rights to use, copy, modify, merge, |
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* publish, distribute, and/or sell copies of the Software, and to permit |
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* persons to whom the Software is furnished to do so, subject to the |
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* following conditions: |
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* |
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* 1. The above copyright notices and this permission notice (which |
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* includes the disclaimer below) shall be included in all copies or |
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* substantial portions of the Software. |
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* |
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* 2. The name of a copyright holder shall not be used to endorse or |
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* promote products derived from the Software without specific prior |
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* written permission. |
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* |
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* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS |
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* LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER |
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* THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS |
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* "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
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* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A |
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* PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO |
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL |
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* INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING |
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* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, |
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* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION |
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* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE |
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* PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE |
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* THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY. |
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* EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS |
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* BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL |
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* PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS |
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* GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE |
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* ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE |
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* IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL |
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* SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES, |
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* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL |
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* SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH |
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* THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH, |
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* PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH |
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* RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY |
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* EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. |
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* |
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* __END_OF_JASPER_LICENSE__ |
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*/ |
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/* |
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* MQ Arithmetic Encoder |
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* |
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* $Id: jpc_mqenc.h,v 1.2 2008-05-26 09:40:52 vp153 Exp $ |
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*/ |
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#ifndef JPC_MQENC_H |
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#define JPC_MQENC_H |
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/******************************************************************************\ |
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* Includes. |
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\******************************************************************************/ |
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#include "jasper/jas_types.h" |
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#include "jasper/jas_stream.h" |
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#include "jpc_mqcod.h" |
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/******************************************************************************\ |
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* Constants. |
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\******************************************************************************/ |
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/* |
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* Termination modes. |
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*/ |
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#define JPC_MQENC_DEFTERM 0 /* default termination */ |
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#define JPC_MQENC_PTERM 1 /* predictable termination */ |
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/******************************************************************************\ |
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* Types. |
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\******************************************************************************/ |
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/* MQ arithmetic encoder class. */ |
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typedef struct { |
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/* The C register. */ |
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uint_fast32_t creg; |
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/* The A register. */ |
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uint_fast32_t areg; |
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/* The CT register. */ |
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uint_fast32_t ctreg; |
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/* The maximum number of contexts. */ |
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int maxctxs; |
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/* The per-context information. */ |
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jpc_mqstate_t **ctxs; |
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/* The current context. */ |
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jpc_mqstate_t **curctx; |
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/* The stream for encoder output. */ |
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jas_stream_t *out; |
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/* The byte buffer (i.e., the B variable in the standard). */ |
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int_fast16_t outbuf; |
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/* The last byte output. */ |
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int_fast16_t lastbyte; |
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/* The error indicator. */ |
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int err; |
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} jpc_mqenc_t; |
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/* MQ arithmetic encoder state information. */ |
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typedef struct { |
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/* The A register. */ |
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unsigned areg; |
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/* The C register. */ |
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unsigned creg; |
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/* The CT register. */ |
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unsigned ctreg; |
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/* The last byte output by the encoder. */ |
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int lastbyte; |
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} jpc_mqencstate_t; |
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/******************************************************************************\ |
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* Functions/macros for construction and destruction. |
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\******************************************************************************/ |
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/* Create a MQ encoder. */ |
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jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out); |
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/* Destroy a MQ encoder. */ |
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void jpc_mqenc_destroy(jpc_mqenc_t *enc); |
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/******************************************************************************\ |
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* Functions/macros for initialization. |
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\******************************************************************************/ |
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/* Initialize a MQ encoder. */ |
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void jpc_mqenc_init(jpc_mqenc_t *enc); |
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/******************************************************************************\ |
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* Functions/macros for context manipulation. |
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\******************************************************************************/ |
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/* Set the current context. */ |
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#define jpc_mqenc_setcurctx(enc, ctxno) \ |
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((enc)->curctx = &(enc)->ctxs[ctxno]); |
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/* Set the state information for a particular context. */ |
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void jpc_mqenc_setctx(jpc_mqenc_t *enc, int ctxno, jpc_mqctx_t *ctx); |
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/* Set the state information for multiple contexts. */ |
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void jpc_mqenc_setctxs(jpc_mqenc_t *enc, int numctxs, jpc_mqctx_t *ctxs); |
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/******************************************************************************\ |
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* Miscellaneous functions/macros. |
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\******************************************************************************/ |
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/* Get the error state of a MQ encoder. */ |
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#define jpc_mqenc_error(enc) \ |
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((enc)->err) |
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/* Get the current encoder state. */ |
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void jpc_mqenc_getstate(jpc_mqenc_t *enc, jpc_mqencstate_t *state); |
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/* Terminate the code. */ |
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int jpc_mqenc_flush(jpc_mqenc_t *enc, int termmode); |
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/******************************************************************************\ |
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* Functions/macros for encoding bits. |
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\******************************************************************************/ |
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/* Encode a bit. */ |
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#if !defined(DEBUG) |
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#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_macro(enc, bit) |
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#else |
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#define jpc_mqenc_putbit(enc, bit) jpc_mqenc_putbit_func(enc, bit) |
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#endif |
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/******************************************************************************\ |
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* Functions/macros for debugging. |
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\******************************************************************************/ |
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int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out); |
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/******************************************************************************\ |
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* Implementation-specific details. |
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\******************************************************************************/ |
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/* Note: This macro is included only to satisfy the needs of |
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the mqenc_putbit macro. */ |
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#define jpc_mqenc_putbit_macro(enc, bit) \ |
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(((*((enc)->curctx))->mps == (bit)) ? \ |
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(((enc)->areg -= (*(enc)->curctx)->qeval), \ |
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((!((enc)->areg & 0x8000)) ? (jpc_mqenc_codemps2(enc)) : \ |
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((enc)->creg += (*(enc)->curctx)->qeval))) : \ |
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jpc_mqenc_codelps(enc)) |
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/* Note: These function prototypes are included only to satisfy the |
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needs of the mqenc_putbit_macro macro. Do not call any of these |
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functions directly. */ |
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int jpc_mqenc_codemps2(jpc_mqenc_t *enc); |
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int jpc_mqenc_codelps(jpc_mqenc_t *enc); |
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/* Note: This function prototype is included only to satisfy the needs of |
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the mqenc_putbit macro. */ |
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int jpc_mqenc_putbit_func(jpc_mqenc_t *enc, int bit); |
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#endif
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