--- /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 Encoder
+ *
+ * $Id: jpc_mqenc.c,v 1.2 2008-05-26 09:40:52 vp153 Exp $
+ */
+
+/******************************************************************************\
+* Includes.
+\******************************************************************************/
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include "jasper/jas_stream.h"
+#include "jasper/jas_malloc.h"
+#include "jasper/jas_math.h"
+#include "jasper/jas_debug.h"
+
+#include "jpc_mqenc.h"
+
+/******************************************************************************\
+* Macros
+\******************************************************************************/
+
+#if defined(DEBUG)
+#define JPC_MQENC_CALL(n, x) \
+ ((jas_getdbglevel() >= (n)) ? ((void)(x)) : ((void)0))
+#else
+#define JPC_MQENC_CALL(n, x)
+#endif
+
+#define jpc_mqenc_codemps9(areg, creg, ctreg, curctx, enc) \
+{ \
+ jpc_mqstate_t *state = *(curctx); \
+ (areg) -= state->qeval; \
+ if (!((areg) & 0x8000)) { \
+ if ((areg) < state->qeval) { \
+ (areg) = state->qeval; \
+ } else { \
+ (creg) += state->qeval; \
+ } \
+ *(curctx) = state->nmps; \
+ jpc_mqenc_renorme((areg), (creg), (ctreg), (enc)); \
+ } else { \
+ (creg) += state->qeval; \
+ } \
+}
+
+#define jpc_mqenc_codelps2(areg, creg, ctreg, curctx, enc) \
+{ \
+ jpc_mqstate_t *state = *(curctx); \
+ (areg) -= state->qeval; \
+ if ((areg) < state->qeval) { \
+ (creg) += state->qeval; \
+ } else { \
+ (areg) = state->qeval; \
+ } \
+ *(curctx) = state->nlps; \
+ jpc_mqenc_renorme((areg), (creg), (ctreg), (enc)); \
+}
+
+#define jpc_mqenc_renorme(areg, creg, ctreg, enc) \
+{ \
+ do { \
+ (areg) <<= 1; \
+ (creg) <<= 1; \
+ if (!--(ctreg)) { \
+ jpc_mqenc_byteout((areg), (creg), (ctreg), (enc)); \
+ } \
+ } while (!((areg) & 0x8000)); \
+}
+
+#define jpc_mqenc_byteout(areg, creg, ctreg, enc) \
+{ \
+ if ((enc)->outbuf != 0xff) { \
+ if ((creg) & 0x8000000) { \
+ if (++((enc)->outbuf) == 0xff) { \
+ (creg) &= 0x7ffffff; \
+ jpc_mqenc_byteout2(enc); \
+ enc->outbuf = ((creg) >> 20) & 0xff; \
+ (creg) &= 0xfffff; \
+ (ctreg) = 7; \
+ } else { \
+ jpc_mqenc_byteout2(enc); \
+ enc->outbuf = ((creg) >> 19) & 0xff; \
+ (creg) &= 0x7ffff; \
+ (ctreg) = 8; \
+ } \
+ } else { \
+ jpc_mqenc_byteout2(enc); \
+ (enc)->outbuf = ((creg) >> 19) & 0xff; \
+ (creg) &= 0x7ffff; \
+ (ctreg) = 8; \
+ } \
+ } else { \
+ jpc_mqenc_byteout2(enc); \
+ (enc)->outbuf = ((creg) >> 20) & 0xff; \
+ (creg) &= 0xfffff; \
+ (ctreg) = 7; \
+ } \
+}
+
+#define jpc_mqenc_byteout2(enc) \
+{ \
+ if (enc->outbuf >= 0) { \
+ if (jas_stream_putc(enc->out, (unsigned char)enc->outbuf) == EOF) { \
+ enc->err |= 1; \
+ } \
+ } \
+ enc->lastbyte = enc->outbuf; \
+}
+
+/******************************************************************************\
+* Local function protoypes.
+\******************************************************************************/
+
+static void jpc_mqenc_setbits(jpc_mqenc_t *mqenc);
+
+/******************************************************************************\
+* Code for creation and destruction of encoder.
+\******************************************************************************/
+
+/* Create a MQ encoder. */
+
+jpc_mqenc_t *jpc_mqenc_create(int maxctxs, jas_stream_t *out)
+{
+ jpc_mqenc_t *mqenc;
+
+ /* Allocate memory for the MQ encoder. */
+ if (!(mqenc = jas_malloc(sizeof(jpc_mqenc_t)))) {
+ goto error;
+ }
+ mqenc->out = out;
+ mqenc->maxctxs = maxctxs;
+
+ /* Allocate memory for the per-context state information. */
+ if (!(mqenc->ctxs = jas_malloc(mqenc->maxctxs * sizeof(jpc_mqstate_t *)))) {
+ goto error;
+ }
+
+ /* Set the current context to the first one. */
+ mqenc->curctx = mqenc->ctxs;
+
+ jpc_mqenc_init(mqenc);
+
+ /* Initialize the per-context state information to something sane. */
+ jpc_mqenc_setctxs(mqenc, 0, 0);
+
+ return mqenc;
+
+error:
+ if (mqenc) {
+ jpc_mqenc_destroy(mqenc);
+ }
+ return 0;
+}
+
+/* Destroy a MQ encoder. */
+
+void jpc_mqenc_destroy(jpc_mqenc_t *mqenc)
+{
+ if (mqenc->ctxs) {
+ jas_free(mqenc->ctxs);
+ }
+ jas_free(mqenc);
+}
+
+/******************************************************************************\
+* State initialization code.
+\******************************************************************************/
+
+/* Initialize the coding state of a MQ encoder. */
+
+void jpc_mqenc_init(jpc_mqenc_t *mqenc)
+{
+ mqenc->areg = 0x8000;
+ mqenc->outbuf = -1;
+ mqenc->creg = 0;
+ mqenc->ctreg = 12;
+ mqenc->lastbyte = -1;
+ mqenc->err = 0;
+}
+
+/* Initialize one or more contexts. */
+
+void jpc_mqenc_setctxs(jpc_mqenc_t *mqenc, int numctxs, jpc_mqctx_t *ctxs)
+{
+ jpc_mqstate_t **ctx;
+ int n;
+
+ ctx = mqenc->ctxs;
+ n = JAS_MIN(mqenc->maxctxs, numctxs);
+ while (--n >= 0) {
+ *ctx = &jpc_mqstates[2 * ctxs->ind + ctxs->mps];
+ ++ctx;
+ ++ctxs;
+ }
+ n = mqenc->maxctxs - numctxs;
+ while (--n >= 0) {
+ *ctx = &jpc_mqstates[0];
+ ++ctx;
+ }
+
+}
+
+/* Get the coding state for a MQ encoder. */
+
+void jpc_mqenc_getstate(jpc_mqenc_t *mqenc, jpc_mqencstate_t *state)
+{
+ state->areg = mqenc->areg;
+ state->creg = mqenc->creg;
+ state->ctreg = mqenc->ctreg;
+ state->lastbyte = mqenc->lastbyte;
+}
+
+/******************************************************************************\
+* Code for coding symbols.
+\******************************************************************************/
+
+/* Encode a bit. */
+
+int jpc_mqenc_putbit_func(jpc_mqenc_t *mqenc, int bit)
+{
+ const jpc_mqstate_t *state;
+ JAS_DBGLOG(100, ("jpc_mqenc_putbit(%p, %d)\n", mqenc, bit));
+ JPC_MQENC_CALL(100, jpc_mqenc_dump(mqenc, stderr));
+
+ state = *(mqenc->curctx);
+
+ if (state->mps == bit) {
+ /* Apply the CODEMPS algorithm as defined in the standard. */
+ mqenc->areg -= state->qeval;
+ if (!(mqenc->areg & 0x8000)) {
+ jpc_mqenc_codemps2(mqenc);
+ } else {
+ mqenc->creg += state->qeval;
+ }
+ } else {
+ /* Apply the CODELPS algorithm as defined in the standard. */
+ jpc_mqenc_codelps2(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc->curctx, mqenc);
+ }
+
+ return jpc_mqenc_error(mqenc) ? (-1) : 0;
+}
+
+int jpc_mqenc_codemps2(jpc_mqenc_t *mqenc)
+{
+ /* Note: This function only performs part of the work associated with
+ the CODEMPS algorithm from the standard. Some of the work is also
+ performed by the caller. */
+
+ jpc_mqstate_t *state = *(mqenc->curctx);
+ if (mqenc->areg < state->qeval) {
+ mqenc->areg = state->qeval;
+ } else {
+ mqenc->creg += state->qeval;
+ }
+ *mqenc->curctx = state->nmps;
+ jpc_mqenc_renorme(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);
+ return jpc_mqenc_error(mqenc) ? (-1) : 0;
+}
+
+int jpc_mqenc_codelps(jpc_mqenc_t *mqenc)
+{
+ jpc_mqenc_codelps2(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc->curctx, mqenc);
+ return jpc_mqenc_error(mqenc) ? (-1) : 0;
+}
+
+/******************************************************************************\
+* Miscellaneous code.
+\******************************************************************************/
+
+/* Terminate the code word. */
+
+int jpc_mqenc_flush(jpc_mqenc_t *mqenc, int termmode)
+{
+ int_fast16_t k;
+
+ switch (termmode) {
+ case JPC_MQENC_PTERM:
+ k = 11 - mqenc->ctreg + 1;
+ while (k > 0) {
+ mqenc->creg <<= mqenc->ctreg;
+ mqenc->ctreg = 0;
+ jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg,
+ mqenc);
+ k -= mqenc->ctreg;
+ }
+ if (mqenc->outbuf != 0xff) {
+ jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);
+ }
+ break;
+ case JPC_MQENC_DEFTERM:
+ jpc_mqenc_setbits(mqenc);
+ mqenc->creg <<= mqenc->ctreg;
+ jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);
+ mqenc->creg <<= mqenc->ctreg;
+ jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);
+ if (mqenc->outbuf != 0xff) {
+ jpc_mqenc_byteout(mqenc->areg, mqenc->creg, mqenc->ctreg, mqenc);
+ }
+ break;
+ default:
+ abort();
+ break;
+ }
+ return 0;
+}
+
+static void jpc_mqenc_setbits(jpc_mqenc_t *mqenc)
+{
+ uint_fast32_t tmp = mqenc->creg + mqenc->areg;
+ mqenc->creg |= 0xffff;
+ if (mqenc->creg >= tmp) {
+ mqenc->creg -= 0x8000;
+ }
+}
+
+/* Dump a MQ encoder to a stream for debugging. */
+
+int jpc_mqenc_dump(jpc_mqenc_t *mqenc, FILE *out)
+{
+ fprintf(out, "AREG = %08x, CREG = %08x, CTREG = %d\n",
+ mqenc->areg, mqenc->creg, mqenc->ctreg);
+ fprintf(out, "IND = %02d, MPS = %d, QEVAL = %04x\n",
+ *mqenc->curctx - jpc_mqstates, (*mqenc->curctx)->mps,
+ (*mqenc->curctx)->qeval);
+ return 0;
+}
projects / opencv / blobdiff