592 lines
14 KiB
C
592 lines
14 KiB
C
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/*
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* Copyright (c) 2001-2002, David Janssens
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* Copyright (c) 2002-2003, Yannick Verschueren
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* Copyright (c) 2002-2003, Communications and remote sensing Laboratory, Universite catholique de Louvain, Belgium
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS `AS IS'
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mqc.h"
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#include <stdio.h>
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/* <summary> */
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/* This struct defines the state of a context. */
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/* </summary> */
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typedef struct mqc_state_s {
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unsigned int qeval; /* the probability of the Least Probable Symbol (0.75->0x8000, 1.5->0xffff) */
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int mps; /* the Most Probable Symbol (0 or 1) */
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struct mqc_state_s *nmps; /* next state if the next encoded symbol is the MPS */
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struct mqc_state_s *nlps; /* next state if the next encoded symbol is the LPS */
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} mqc_state_t;
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/* <summary> */
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/* This array defines all the possible states for a context. */
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/* </summary> */
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mqc_state_t mqc_states[47 * 2] = {
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{0x5601, 0, &mqc_states[2], &mqc_states[3]},
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{0x5601, 1, &mqc_states[3], &mqc_states[2]},
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{0x3401, 0, &mqc_states[4], &mqc_states[12]},
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{0x3401, 1, &mqc_states[5], &mqc_states[13]},
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{0x1801, 0, &mqc_states[6], &mqc_states[18]},
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{0x1801, 1, &mqc_states[7], &mqc_states[19]},
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{0x0ac1, 0, &mqc_states[8], &mqc_states[24]},
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{0x0ac1, 1, &mqc_states[9], &mqc_states[25]},
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{0x0521, 0, &mqc_states[10], &mqc_states[58]},
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{0x0521, 1, &mqc_states[11], &mqc_states[59]},
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{0x0221, 0, &mqc_states[76], &mqc_states[66]},
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{0x0221, 1, &mqc_states[77], &mqc_states[67]},
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{0x5601, 0, &mqc_states[14], &mqc_states[13]},
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{0x5601, 1, &mqc_states[15], &mqc_states[12]},
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{0x5401, 0, &mqc_states[16], &mqc_states[28]},
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{0x5401, 1, &mqc_states[17], &mqc_states[29]},
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{0x4801, 0, &mqc_states[18], &mqc_states[28]},
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{0x4801, 1, &mqc_states[19], &mqc_states[29]},
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{0x3801, 0, &mqc_states[20], &mqc_states[28]},
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{0x3801, 1, &mqc_states[21], &mqc_states[29]},
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{0x3001, 0, &mqc_states[22], &mqc_states[34]},
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{0x3001, 1, &mqc_states[23], &mqc_states[35]},
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{0x2401, 0, &mqc_states[24], &mqc_states[36]},
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{0x2401, 1, &mqc_states[25], &mqc_states[37]},
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{0x1c01, 0, &mqc_states[26], &mqc_states[40]},
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{0x1c01, 1, &mqc_states[27], &mqc_states[41]},
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{0x1601, 0, &mqc_states[58], &mqc_states[42]},
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{0x1601, 1, &mqc_states[59], &mqc_states[43]},
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{0x5601, 0, &mqc_states[30], &mqc_states[29]},
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{0x5601, 1, &mqc_states[31], &mqc_states[28]},
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{0x5401, 0, &mqc_states[32], &mqc_states[28]},
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{0x5401, 1, &mqc_states[33], &mqc_states[29]},
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{0x5101, 0, &mqc_states[34], &mqc_states[30]},
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{0x5101, 1, &mqc_states[35], &mqc_states[31]},
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{0x4801, 0, &mqc_states[36], &mqc_states[32]},
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{0x4801, 1, &mqc_states[37], &mqc_states[33]},
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{0x3801, 0, &mqc_states[38], &mqc_states[34]},
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{0x3801, 1, &mqc_states[39], &mqc_states[35]},
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{0x3401, 0, &mqc_states[40], &mqc_states[36]},
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{0x3401, 1, &mqc_states[41], &mqc_states[37]},
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{0x3001, 0, &mqc_states[42], &mqc_states[38]},
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{0x3001, 1, &mqc_states[43], &mqc_states[39]},
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{0x2801, 0, &mqc_states[44], &mqc_states[38]},
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{0x2801, 1, &mqc_states[45], &mqc_states[39]},
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{0x2401, 0, &mqc_states[46], &mqc_states[40]},
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{0x2401, 1, &mqc_states[47], &mqc_states[41]},
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{0x2201, 0, &mqc_states[48], &mqc_states[42]},
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{0x2201, 1, &mqc_states[49], &mqc_states[43]},
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{0x1c01, 0, &mqc_states[50], &mqc_states[44]},
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{0x1c01, 1, &mqc_states[51], &mqc_states[45]},
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{0x1801, 0, &mqc_states[52], &mqc_states[46]},
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{0x1801, 1, &mqc_states[53], &mqc_states[47]},
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{0x1601, 0, &mqc_states[54], &mqc_states[48]},
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{0x1601, 1, &mqc_states[55], &mqc_states[49]},
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{0x1401, 0, &mqc_states[56], &mqc_states[50]},
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{0x1401, 1, &mqc_states[57], &mqc_states[51]},
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{0x1201, 0, &mqc_states[58], &mqc_states[52]},
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{0x1201, 1, &mqc_states[59], &mqc_states[53]},
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{0x1101, 0, &mqc_states[60], &mqc_states[54]},
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{0x1101, 1, &mqc_states[61], &mqc_states[55]},
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{0x0ac1, 0, &mqc_states[62], &mqc_states[56]},
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{0x0ac1, 1, &mqc_states[63], &mqc_states[57]},
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{0x09c1, 0, &mqc_states[64], &mqc_states[58]},
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{0x09c1, 1, &mqc_states[65], &mqc_states[59]},
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{0x08a1, 0, &mqc_states[66], &mqc_states[60]},
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{0x08a1, 1, &mqc_states[67], &mqc_states[61]},
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{0x0521, 0, &mqc_states[68], &mqc_states[62]},
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{0x0521, 1, &mqc_states[69], &mqc_states[63]},
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{0x0441, 0, &mqc_states[70], &mqc_states[64]},
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{0x0441, 1, &mqc_states[71], &mqc_states[65]},
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{0x02a1, 0, &mqc_states[72], &mqc_states[66]},
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{0x02a1, 1, &mqc_states[73], &mqc_states[67]},
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{0x0221, 0, &mqc_states[74], &mqc_states[68]},
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{0x0221, 1, &mqc_states[75], &mqc_states[69]},
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{0x0141, 0, &mqc_states[76], &mqc_states[70]},
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{0x0141, 1, &mqc_states[77], &mqc_states[71]},
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{0x0111, 0, &mqc_states[78], &mqc_states[72]},
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{0x0111, 1, &mqc_states[79], &mqc_states[73]},
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{0x0085, 0, &mqc_states[80], &mqc_states[74]},
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{0x0085, 1, &mqc_states[81], &mqc_states[75]},
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{0x0049, 0, &mqc_states[82], &mqc_states[76]},
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{0x0049, 1, &mqc_states[83], &mqc_states[77]},
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{0x0025, 0, &mqc_states[84], &mqc_states[78]},
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{0x0025, 1, &mqc_states[85], &mqc_states[79]},
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{0x0015, 0, &mqc_states[86], &mqc_states[80]},
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{0x0015, 1, &mqc_states[87], &mqc_states[81]},
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{0x0009, 0, &mqc_states[88], &mqc_states[82]},
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{0x0009, 1, &mqc_states[89], &mqc_states[83]},
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{0x0005, 0, &mqc_states[90], &mqc_states[84]},
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{0x0005, 1, &mqc_states[91], &mqc_states[85]},
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{0x0001, 0, &mqc_states[90], &mqc_states[86]},
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{0x0001, 1, &mqc_states[91], &mqc_states[87]},
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{0x5601, 0, &mqc_states[92], &mqc_states[92]},
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{0x5601, 1, &mqc_states[93], &mqc_states[93]},
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};
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#define MQC_NUMCTXS 32
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unsigned int mqc_c;
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unsigned int mqc_a;
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unsigned int mqc_ct;
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unsigned char *mqc_bp;
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unsigned char *mqc_start;
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unsigned char *mqc_end;
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mqc_state_t *mqc_ctxs[MQC_NUMCTXS];
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mqc_state_t **mqc_curctx;
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/* <summary> */
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/* Return the number of bytes already encoded. */
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/* </summary> */
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int mqc_numbytes()
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{
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return mqc_bp - mqc_start;
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}
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/* <summary> */
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/* Output a byte, doing bit-stuffing if necessary. */
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/* After a 0xff byte, the next byte must be smaller than 0x90 */
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/* </summary> */
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void mqc_byteout()
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{
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if (*mqc_bp == 0xff) {
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mqc_bp++;
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*mqc_bp = mqc_c >> 20;
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mqc_c &= 0xfffff;
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mqc_ct = 7;
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} else {
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if ((mqc_c & 0x8000000) == 0) { /* ((mqc_c&0x8000000)==0) CHANGE */
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mqc_bp++;
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*mqc_bp = mqc_c >> 19;
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mqc_c &= 0x7ffff;
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mqc_ct = 8;
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} else {
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(*mqc_bp)++;
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if (*mqc_bp == 0xff) {
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mqc_c &= 0x7ffffff;
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mqc_bp++;
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*mqc_bp = mqc_c >> 20;
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mqc_c &= 0xfffff;
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mqc_ct = 7;
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} else {
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mqc_bp++;
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*mqc_bp = mqc_c >> 19;
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mqc_c &= 0x7ffff;
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mqc_ct = 8;
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}
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}
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}
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}
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/* <summary> */
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/* Renormalize mqc_a and mqc_c while encoding, so that mqc_a stays between 0x8000 and 0x10000 */
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/* </summary> */
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void mqc_renorme()
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{
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do {
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mqc_a <<= 1;
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mqc_c <<= 1;
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mqc_ct--;
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if (mqc_ct == 0) {
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mqc_byteout();
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}
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} while ((mqc_a & 0x8000) == 0);
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}
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/* <summary> */
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/* Encode the most probable symbol. */
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/* </summary> */
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void mqc_codemps()
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{
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mqc_a -= (*mqc_curctx)->qeval;
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if ((mqc_a & 0x8000) == 0) {
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if (mqc_a < (*mqc_curctx)->qeval) {
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mqc_a = (*mqc_curctx)->qeval;
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} else {
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mqc_c += (*mqc_curctx)->qeval;
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}
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*mqc_curctx = (*mqc_curctx)->nmps;
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mqc_renorme();
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} else {
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mqc_c += (*mqc_curctx)->qeval;
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}
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}
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/* <summary> */
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/* Encode the most least symbol. */
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/* </summary> */
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void mqc_codelps()
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{
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mqc_a -= (*mqc_curctx)->qeval;
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if (mqc_a < (*mqc_curctx)->qeval) {
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mqc_c += (*mqc_curctx)->qeval;
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} else {
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mqc_a = (*mqc_curctx)->qeval;
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}
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*mqc_curctx = (*mqc_curctx)->nlps;
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mqc_renorme();
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}
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/* <summary> */
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/* Initialize encoder. */
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/* </summary> */
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/* <param name="bp">Output buffer.</param> */
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void mqc_init_enc(unsigned char *bp)
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{
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mqc_setcurctx(0);
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mqc_a = 0x8000;
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mqc_c = 0;
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mqc_bp = bp - 1;
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mqc_ct = 12;
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if (*mqc_bp == 0xff) {
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mqc_ct = 13;
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}
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mqc_start = bp;
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}
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/* <summary> */
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/* Set current context. */
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/* </summary> */
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/* <param name="ctxno">Context number.</param> */
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void mqc_setcurctx(int ctxno)
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{
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mqc_curctx = &mqc_ctxs[ctxno];
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}
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/* <summary> */
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/* Encode a symbol using the MQ-coder. */
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/* </summary> */
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/* <param name="d"> The symbol to be encoded (0 or 1).</param> */
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void mqc_encode(int d)
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{
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if ((*mqc_curctx)->mps == d) {
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mqc_codemps();
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} else {
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mqc_codelps();
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}
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}
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/* <summary> */
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/* Fill mqc_c with 1's for flushing */
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/* </summary> */
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void mqc_setbits()
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{
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unsigned int tempc = mqc_c + mqc_a;
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mqc_c |= 0xffff;
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if (mqc_c >= tempc) {
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mqc_c -= 0x8000;
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}
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}
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/* <summary> */
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/* Flush encoded data. */
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/* </summary> */
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void mqc_flush()
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{
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||
|
|
mqc_setbits();
|
||
|
|
mqc_c <<= mqc_ct;
|
||
|
|
mqc_byteout();
|
||
|
|
mqc_c <<= mqc_ct;
|
||
|
|
mqc_byteout();
|
||
|
|
|
||
|
|
if (*mqc_bp != 0xff) {
|
||
|
|
mqc_bp++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* not fully implemented and tested !! */
|
||
|
|
/* BYPASS mode switch, initialization operation */
|
||
|
|
/* JPEG 2000 p 505 */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_bypass_init_enc()
|
||
|
|
{
|
||
|
|
mqc_c = 0;
|
||
|
|
mqc_ct = 8;
|
||
|
|
/*if (*mqc_bp == 0xff) {
|
||
|
|
mqc_ct = 7;
|
||
|
|
} */
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* not fully implemented and tested !! */
|
||
|
|
/* BYPASS mode switch, coding operation */
|
||
|
|
/* JPEG 2000 p 505 */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_bypass_enc(int d)
|
||
|
|
{
|
||
|
|
mqc_ct--;
|
||
|
|
mqc_c = mqc_c + (d << mqc_ct);
|
||
|
|
if (mqc_ct == 0) {
|
||
|
|
mqc_bp++;
|
||
|
|
*mqc_bp = mqc_c;
|
||
|
|
mqc_ct = 8;
|
||
|
|
if (*mqc_bp == 0xff) {
|
||
|
|
mqc_ct = 7;
|
||
|
|
}
|
||
|
|
mqc_c = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* not fully implemented and tested !! */
|
||
|
|
/* BYPASS mode switch, flush operation */
|
||
|
|
/* </summary> */
|
||
|
|
int mqc_bypass_flush_enc()
|
||
|
|
{
|
||
|
|
unsigned char bit_padding;
|
||
|
|
|
||
|
|
bit_padding = 0;
|
||
|
|
|
||
|
|
if (mqc_ct != 0) {
|
||
|
|
while (mqc_ct > 0) {
|
||
|
|
mqc_ct--;
|
||
|
|
mqc_c += bit_padding << mqc_ct;
|
||
|
|
bit_padding = (bit_padding + 1) & 0x01;
|
||
|
|
}
|
||
|
|
mqc_bp++;
|
||
|
|
*mqc_bp = mqc_c;
|
||
|
|
mqc_ct = 8;
|
||
|
|
mqc_c = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
return 1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* RESET mode switch */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_reset_enc()
|
||
|
|
{
|
||
|
|
mqc_resetstates();
|
||
|
|
mqc_setstate(18, 0, 46);
|
||
|
|
mqc_setstate(0, 0, 3);
|
||
|
|
mqc_setstate(1, 0, 4);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* mode switch RESTART (TERMALL) */
|
||
|
|
/* </summary> */
|
||
|
|
int mqc_restart_enc()
|
||
|
|
{
|
||
|
|
int correction = 1;
|
||
|
|
|
||
|
|
/* <flush part> */
|
||
|
|
int n = 27 - 15 - mqc_ct;
|
||
|
|
mqc_c <<= mqc_ct;
|
||
|
|
while (n > 0) {
|
||
|
|
mqc_byteout();
|
||
|
|
n -= mqc_ct;
|
||
|
|
mqc_c <<= mqc_ct;
|
||
|
|
}
|
||
|
|
mqc_byteout();
|
||
|
|
|
||
|
|
return correction;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* mode switch RESTART (TERMALL) reinitialisation */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_restart_init_enc()
|
||
|
|
{
|
||
|
|
/* <Re-init part> */
|
||
|
|
mqc_setcurctx(0);
|
||
|
|
mqc_a = 0x8000;
|
||
|
|
mqc_c = 0;
|
||
|
|
mqc_ct = 12;
|
||
|
|
mqc_bp--;
|
||
|
|
if (*mqc_bp == 0xff) {
|
||
|
|
mqc_ct = 13;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* ERTERM mode switch */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_erterm_enc()
|
||
|
|
{
|
||
|
|
int k = 11 - mqc_ct + 1;
|
||
|
|
|
||
|
|
while (k > 0) {
|
||
|
|
mqc_c <<= mqc_ct;
|
||
|
|
mqc_ct = 0;
|
||
|
|
mqc_byteout();
|
||
|
|
k -= mqc_ct;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (*mqc_bp != 0xff) {
|
||
|
|
mqc_byteout();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* SEGMARK mode switch (SEGSYM) */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_segmark_enc()
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
mqc_setcurctx(18);
|
||
|
|
|
||
|
|
for (i = 1; i < 5; i++) {
|
||
|
|
mqc_encode(i % 2);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* </summary> */
|
||
|
|
int mqc_mpsexchange()
|
||
|
|
{
|
||
|
|
int d;
|
||
|
|
if (mqc_a < (*mqc_curctx)->qeval) {
|
||
|
|
d = 1 - (*mqc_curctx)->mps;
|
||
|
|
*mqc_curctx = (*mqc_curctx)->nlps;
|
||
|
|
} else {
|
||
|
|
d = (*mqc_curctx)->mps;
|
||
|
|
*mqc_curctx = (*mqc_curctx)->nmps;
|
||
|
|
}
|
||
|
|
return d;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* </summary> */
|
||
|
|
int mqc_lpsexchange()
|
||
|
|
{
|
||
|
|
int d;
|
||
|
|
if (mqc_a < (*mqc_curctx)->qeval) {
|
||
|
|
mqc_a = (*mqc_curctx)->qeval;
|
||
|
|
d = (*mqc_curctx)->mps;
|
||
|
|
*mqc_curctx = (*mqc_curctx)->nmps;
|
||
|
|
} else {
|
||
|
|
mqc_a = (*mqc_curctx)->qeval;
|
||
|
|
d = 1 - (*mqc_curctx)->mps;
|
||
|
|
*mqc_curctx = (*mqc_curctx)->nlps;
|
||
|
|
}
|
||
|
|
return d;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Input a byte. */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_bytein()
|
||
|
|
{
|
||
|
|
if (mqc_bp != mqc_end) {
|
||
|
|
unsigned int c;
|
||
|
|
if (mqc_bp + 1 != mqc_end) {
|
||
|
|
c = *(mqc_bp + 1);
|
||
|
|
} else {
|
||
|
|
c = 0xff;
|
||
|
|
}
|
||
|
|
if (*mqc_bp == 0xff) {
|
||
|
|
if (c > 0x8f) {
|
||
|
|
mqc_c += 0xff00;
|
||
|
|
mqc_ct = 8;
|
||
|
|
} else {
|
||
|
|
mqc_bp++;
|
||
|
|
mqc_c += c << 9;
|
||
|
|
mqc_ct = 7;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
mqc_bp++;
|
||
|
|
mqc_c += c << 8;
|
||
|
|
mqc_ct = 8;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
mqc_c += 0xff00;
|
||
|
|
mqc_ct = 8;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Renormalize mqc_a and mqc_c while decoding. */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_renormd()
|
||
|
|
{
|
||
|
|
do {
|
||
|
|
if (mqc_ct == 0) {
|
||
|
|
mqc_bytein();
|
||
|
|
}
|
||
|
|
mqc_a <<= 1;
|
||
|
|
mqc_c <<= 1;
|
||
|
|
mqc_ct--;
|
||
|
|
} while (mqc_a < 0x8000);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Initialize decoder. */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_init_dec(unsigned char *bp, int len)
|
||
|
|
{
|
||
|
|
mqc_setcurctx(0);
|
||
|
|
mqc_start = bp;
|
||
|
|
mqc_end = bp + len;
|
||
|
|
mqc_bp = bp;
|
||
|
|
//add antonin initbug1
|
||
|
|
if (len==0) mqc_c = 0xff << 16;
|
||
|
|
else mqc_c = *mqc_bp << 16;
|
||
|
|
//dda
|
||
|
|
mqc_bytein();
|
||
|
|
mqc_c <<= 7;
|
||
|
|
mqc_ct -= 7;
|
||
|
|
mqc_a = 0x8000;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Decode a symbol. */
|
||
|
|
/* </summary> */
|
||
|
|
int mqc_decode()
|
||
|
|
{
|
||
|
|
int d;
|
||
|
|
mqc_a -= (*mqc_curctx)->qeval;
|
||
|
|
if ((mqc_c >> 16) < (*mqc_curctx)->qeval) {
|
||
|
|
d = mqc_lpsexchange();
|
||
|
|
mqc_renormd();
|
||
|
|
} else {
|
||
|
|
mqc_c -= (*mqc_curctx)->qeval << 16;
|
||
|
|
if ((mqc_a & 0x8000) == 0) {
|
||
|
|
d = mqc_mpsexchange();
|
||
|
|
mqc_renormd();
|
||
|
|
} else {
|
||
|
|
d = (*mqc_curctx)->mps;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return d;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Reset states of all contexts. */
|
||
|
|
/* </summary> */
|
||
|
|
void mqc_resetstates()
|
||
|
|
{
|
||
|
|
int i;
|
||
|
|
for (i = 0; i < MQC_NUMCTXS; i++) {
|
||
|
|
mqc_ctxs[i] = mqc_states;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/* <summary> */
|
||
|
|
/* Set the state for a context. */
|
||
|
|
/* </summary> */
|
||
|
|
/* <param name="ctxno">Context number</param> */
|
||
|
|
/* <param name="msb">Most significant bit</param> */
|
||
|
|
/* <param name="prob">Index to the probability of symbols</param> */
|
||
|
|
void mqc_setstate(int ctxno, int msb, int prob)
|
||
|
|
{
|
||
|
|
mqc_ctxs[ctxno] = &mqc_states[msb + (prob << 1)];
|
||
|
|
}
|