/* * 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_alloc2(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", (unsigned)mqenc->areg, (unsigned)mqenc->creg, (int)mqenc->ctreg); fprintf(out, "IND = %02d, MPS = %d, QEVAL = %04x\n", (int)(*mqenc->curctx - jpc_mqstates), (int)(*mqenc->curctx)->mps, (int)(*mqenc->curctx)->qeval); return 0; }