--- /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.c,v 1.2 2008-05-26 09:40:52 vp153 Exp $
+ */
+
+/******************************************************************************\
+* Includes.
+\******************************************************************************/
+
+#include <assert.h>
+#include <stdlib.h>
+#include <stdarg.h>
+
+#include "jasper/jas_types.h"
+#include "jasper/jas_malloc.h"
+#include "jasper/jas_math.h"
+#include "jasper/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);
+}
projects / opencv / blobdiff