WebSVN - AndroidProjects - Rev 244 - /tools/osframework/source/ImageLib/jpeg2000/jpc

/*
* 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 Software License
*
* IMAGE POWER JPEG-2000 PUBLIC LICENSE
* ************************************
*
* GRANT:
*
* Permission is hereby granted, free of charge, to any person (the "User")
* obtaining a copy of this software and associated documentation, to deal
* in the JasPer Software without restriction, including without limitation
* the right to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the JasPer Software (in source and binary forms),
* and to permit persons to whom the JasPer Software is furnished to do so,
* provided further that the License Conditions below are met.
*
* License Conditions
* ******************
*
* A. Redistributions of source code must retain the above copyright notice,
* and this list of conditions, and the following disclaimer.
*
* B. Redistributions in binary form must reproduce the above copyright
* notice, and this list of conditions, and the following disclaimer in
* the documentation and/or other materials provided with the distribution.
*
* C. Neither the name of Image Power, Inc. nor any other contributor
* (including, but not limited to, the University of British Columbia and
* Michael David Adams) may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* D. User agrees that it shall not commence any action against Image Power,
* Inc., the University of British Columbia, Michael David Adams, or any
* other contributors (collectively "Licensors") for infringement of any
* intellectual property rights ("IPR") held by the User in respect of any
* technology that User owns or has a right to license or sublicense and
* which is an element required in order to claim compliance with ISO/IEC
* 15444-1 (i.e., JPEG-2000 Part 1). "IPR" means all intellectual property
* rights worldwide arising under statutory or common law, and whether
* or not perfected, including, without limitation, all (i) patents and
* patent applications owned or licensable by User; (ii) rights associated
* with works of authorship including copyrights, copyright applications,
* copyright registrations, mask work rights, mask work applications,
* mask work registrations; (iii) rights relating to the protection of
* trade secrets and confidential information; (iv) any right analogous
* to those set forth in subsections (i), (ii), or (iii) and any other
* proprietary rights relating to intangible property (other than trademark,
* trade dress, or service mark rights); and (v) divisions, continuations,
* renewals, reissues and extensions of the foregoing (as and to the extent
* applicable) now existing, hereafter filed, issued or acquired.
*
* E. If User commences an infringement action against any Licensor(s) then
* such Licensor(s) shall have the right to terminate User's license and
* all sublicenses that have been granted hereunder by User to other parties.
*
* F. This software is for use only in hardware or software products that
* are compliant with ISO/IEC 15444-1 (i.e., JPEG-2000 Part 1). No license
* or right to this Software is granted for products that do not comply
* with ISO/IEC 15444-1. The JPEG-2000 Part 1 standard can be purchased
* from the ISO.
*
* THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE.
* NO USE OF THE JASPER SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
* THIS DISCLAIMER. THE JASPER SOFTWARE IS PROVIDED BY THE LICENSORS AND
* CONTRIBUTORS UNDER THIS LICENSE ON AN ``AS-IS'' BASIS, WITHOUT WARRANTY
* OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION,
* WARRANTIES THAT THE JASPER SOFTWARE IS FREE OF DEFECTS, IS MERCHANTABLE,
* IS FIT FOR A PARTICULAR PURPOSE OR IS NON-INFRINGING. THOSE INTENDING
* TO USE THE JASPER SOFTWARE OR MODIFICATIONS THEREOF FOR USE IN HARDWARE
* OR SOFTWARE PRODUCTS ARE ADVISED THAT THEIR USE MAY INFRINGE EXISTING
* PATENTS, COPYRIGHTS, TRADEMARKS, OR OTHER INTELLECTUAL PROPERTY RIGHTS.
* THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE JASPER SOFTWARE
* IS WITH THE USER. SHOULD ANY PART OF THE JASPER SOFTWARE PROVE DEFECTIVE
* IN ANY RESPECT, THE USER (AND NOT THE INITIAL DEVELOPERS, THE UNIVERSITY
* OF BRITISH COLUMBIA, IMAGE POWER, INC., MICHAEL DAVID ADAMS, OR ANY
* OTHER CONTRIBUTOR) SHALL ASSUME THE COST OF ANY NECESSARY SERVICING,
* REPAIR OR CORRECTION. UNDER NO CIRCUMSTANCES AND UNDER NO LEGAL THEORY,
* WHETHER TORT (INCLUDING NEGLIGENCE), CONTRACT, OR OTHERWISE, SHALL THE
* INITIAL DEVELOPER, THE UNIVERSITY OF BRITISH COLUMBIA, IMAGE POWER, INC.,
* MICHAEL DAVID ADAMS, ANY OTHER CONTRIBUTOR, OR ANY DISTRIBUTOR OF THE
* JASPER SOFTWARE, OR ANY SUPPLIER OF ANY OF SUCH PARTIES, BE LIABLE TO
* THE USER OR ANY OTHER PERSON FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
* CONSEQUENTIAL DAMAGES OF ANY CHARACTER INCLUDING, WITHOUT LIMITATION,
* DAMAGES FOR LOSS OF GOODWILL, WORK STOPPAGE, COMPUTER FAILURE OR
* MALFUNCTION, OR ANY AND ALL OTHER COMMERCIAL DAMAGES OR LOSSES, EVEN IF
* SUCH PARTY HAD BEEN INFORMED, OR OUGHT TO HAVE KNOWN, OF THE POSSIBILITY
* OF SUCH DAMAGES. THE JASPER SOFTWARE AND UNDERLYING TECHNOLOGY ARE NOT
* FAULT-TOLERANT AND ARE NOT DESIGNED, MANUFACTURED OR INTENDED FOR USE OR
* RESALE AS ON-LINE CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING
* FAIL-SAFE PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES,
* AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT
* LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
* JASPER SOFTWARE OR UNDERLYING TECHNOLOGY OR PRODUCT COULD LEAD DIRECTLY
* TO DEATH, PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE
* ("HIGH RISK ACTIVITIES"). LICENSOR SPECIFICALLY DISCLAIMS ANY EXPRESS
* OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES. USER WILL NOT
* KNOWINGLY USE, DISTRIBUTE OR RESELL THE JASPER SOFTWARE OR UNDERLYING
* TECHNOLOGY OR PRODUCTS FOR HIGH RISK ACTIVITIES AND WILL ENSURE THAT ITS
* CUSTOMERS AND END-USERS OF ITS PRODUCTS ARE PROVIDED WITH A COPY OF THE
* NOTICE SPECIFIED IN THIS SECTION.
*
* __END_OF_JASPER_LICENSE__
*/

/*
* MQ Arithmetic Decoder
*
* $Id: jpc_mqdec.c,v 1.1 2003/05/15 01:30:32 ace Exp $
*/

/******************************************************************************\
* Includes.
\******************************************************************************/

#include <assert.h>
#include <stdlib.h>
#include <stdarg.h>

#include "jas_types.h"
#include "jas_malloc.h"
#include "jas_math.h"
#include "jas_debug.h"

#include "jpc_mqdec.h"

/******************************************************************************\
* Local macros.
\******************************************************************************/

#if defined(DEBUG)
#define MQDEC_CALL(n, x) \
((jas_getdbglevel() >= (n)) ? ((void)(x)) : ((void)0))
#else
#define MQDEC_CALL(n, x)
#endif

/******************************************************************************\
* Local function prototypes.
\******************************************************************************/

static void jpc_mqdec_bytein(jpc_mqdec_t *mqdec);

/******************************************************************************\
* Code for creation and destruction of a MQ decoder.
\******************************************************************************/

/* Create a MQ decoder. */
jpc_mqdec_t *jpc_mqdec_create(int maxctxs, jas_stream_t *in)
{
jpc_mqdec_t *mqdec;

/* There must be at least one context. */
assert(maxctxs > 0);

/* Allocate memory for the MQ decoder. */
if (!(mqdec = jas_malloc(sizeof(jpc_mqdec_t)))) {
goto error;
}
mqdec->in = in;
mqdec->maxctxs = maxctxs;
/* Allocate memory for the per-context state information. */
if (!(mqdec->ctxs = jas_malloc(mqdec->maxctxs * sizeof(jpc_mqstate_t *)))) {
goto error;
}
/* Set the current context to the first context. */
mqdec->curctx = mqdec->ctxs;

/* If an input stream has been associated with the MQ decoder,
initialize the decoder state from the stream. */
if (mqdec->in) {
jpc_mqdec_init(mqdec);
}
/* Initialize the per-context state information. */
jpc_mqdec_setctxs(mqdec, 0, 0);

return mqdec;

error:
/* Oops... Something has gone wrong. */
if (mqdec) {
jpc_mqdec_destroy(mqdec);
}
return 0;
}

/* Destroy a MQ decoder. */
void jpc_mqdec_destroy(jpc_mqdec_t *mqdec)
{
if (mqdec->ctxs) {
jas_free(mqdec->ctxs);
}
jas_free(mqdec);
}

/******************************************************************************\
* Code for initialization of a MQ decoder.
\******************************************************************************/

/* Initialize the state of a MQ decoder. */

void jpc_mqdec_init(jpc_mqdec_t *mqdec)
{
int c;

mqdec->eof = 0;
mqdec->creg = 0;
/* Get the next byte from the input stream. */
if ((c = jas_stream_getc(mqdec->in)) == EOF) {
/* We have encountered an I/O error or EOF. */
c = 0xff;
mqdec->eof = 1;
}
mqdec->inbuffer = c;
mqdec->creg += mqdec->inbuffer << 16;
jpc_mqdec_bytein(mqdec);
mqdec->creg <<= 7;
mqdec->ctreg -= 7;
mqdec->areg = 0x8000;
}

/* Set the input stream for a MQ decoder. */

void jpc_mqdec_setinput(jpc_mqdec_t *mqdec, jas_stream_t *in)
{
mqdec->in = in;
}

/* Initialize one or more contexts. */

void jpc_mqdec_setctxs(jpc_mqdec_t *mqdec, int numctxs, jpc_mqctx_t *ctxs)
{
jpc_mqstate_t **ctx;
int n;

ctx = mqdec->ctxs;
n = JAS_MIN(mqdec->maxctxs, numctxs);
while (--n >= 0) {
*ctx = &jpc_mqstates[2 * ctxs->ind + ctxs->mps];
++ctx;
++ctxs;
}
n = mqdec->maxctxs - numctxs;
while (--n >= 0) {
*ctx = &jpc_mqstates[0];
++ctx;
}
}

/* Initialize a context. */

void jpc_mqdec_setctx(jpc_mqdec_t *mqdec, int ctxno, jpc_mqctx_t *ctx)
{
jpc_mqstate_t **ctxi;
ctxi = &mqdec->ctxs[ctxno];
*ctxi = &jpc_mqstates[2 * ctx->ind + ctx->mps];
}

/******************************************************************************\
* Code for decoding a bit.
\******************************************************************************/

/* Decode a bit. */

int jpc_mqdec_getbit_func(register jpc_mqdec_t *mqdec)
{
int bit;
JAS_DBGLOG(100, ("jpc_mqdec_getbit_func(%p)\n", mqdec));
MQDEC_CALL(100, jpc_mqdec_dump(mqdec, stderr));
bit = jpc_mqdec_getbit_macro(mqdec);
MQDEC_CALL(100, jpc_mqdec_dump(mqdec, stderr));
JAS_DBGLOG(100, ("ctx = %d, decoded %d\n", mqdec->curctx -
mqdec->ctxs, bit));
return bit;
}

/* Apply MPS_EXCHANGE algorithm (with RENORMD). */
int jpc_mqdec_mpsexchrenormd(register jpc_mqdec_t *mqdec)
{
int ret;
register jpc_mqstate_t *state = *mqdec->curctx;
jpc_mqdec_mpsexchange(mqdec->areg, state->qeval, mqdec->curctx, ret);
jpc_mqdec_renormd(mqdec->areg, mqdec->creg, mqdec->ctreg, mqdec->in,
mqdec->eof, mqdec->inbuffer);
return ret;
}

/* Apply LPS_EXCHANGE algorithm (with RENORMD). */
int jpc_mqdec_lpsexchrenormd(register jpc_mqdec_t *mqdec)
{
int ret;
register jpc_mqstate_t *state = *mqdec->curctx;
jpc_mqdec_lpsexchange(mqdec->areg, state->qeval, mqdec->curctx, ret);
jpc_mqdec_renormd(mqdec->areg, mqdec->creg, mqdec->ctreg, mqdec->in,
mqdec->eof, mqdec->inbuffer);
return ret;
}

/******************************************************************************\
* Support code.
\******************************************************************************/

/* Apply the BYTEIN algorithm. */
static void jpc_mqdec_bytein(jpc_mqdec_t *mqdec)
{
int c;
unsigned char prevbuf;

if (!mqdec->eof) {
if ((c = jas_stream_getc(mqdec->in)) == EOF) {
mqdec->eof = 1;
c = 0xff;
}
prevbuf = mqdec->inbuffer;
mqdec->inbuffer = c;
if (prevbuf == 0xff) {
if (c > 0x8f) {
mqdec->creg += 0xff00;
mqdec->ctreg = 8;
} else {
mqdec->creg += c << 9;
mqdec->ctreg = 7;
}
} else {
mqdec->creg += c << 8;
mqdec->ctreg = 8;
}
} else {
mqdec->creg += 0xff00;
mqdec->ctreg = 8;
}
}

/******************************************************************************\
* Code for debugging.
\******************************************************************************/

/* Dump a MQ decoder to a stream for debugging. */

void jpc_mqdec_dump(jpc_mqdec_t *mqdec, FILE *out)
{
fprintf(out, "MQDEC A = %08lx, C = %08lx, CT=%08lx, ",
(unsigned long) mqdec->areg, (unsigned long) mqdec->creg,
(unsigned long) mqdec->ctreg);
fprintf(out, "CTX = %d, ", mqdec->curctx - mqdec->ctxs);
fprintf(out, "IND %d, MPS %d, QEVAL %x\n", *mqdec->curctx -
jpc_mqstates, (*mqdec->curctx)->mps, (*mqdec->curctx)->qeval);
}

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