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113 lines
3.1 KiB
113 lines
3.1 KiB
12 years ago
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/*
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* MQ-coder encoder and decoder common functions
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* Copyright (c) 2007 Kamil Nowosad
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* MQ-coder common (decoder/encoder) functions
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* @file
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* @author Kamil Nowosad
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*/
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#include <string.h>
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#include <stdint.h>
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#include "mqc.h"
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/* MQ coder context state structure */
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typedef struct MqcCxState {
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uint16_t qe;
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uint8_t nmps;
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uint8_t nlps;
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uint8_t sw;
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} MqcCxState;
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static const MqcCxState cx_states[47] = {
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{ 0x5601, 1, 1, 1 },
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{ 0x3401, 2, 6, 0 },
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{ 0x1801, 3, 9, 0 },
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{ 0x0AC1, 4, 12, 0 },
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{ 0x0521, 5, 29, 0 },
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{ 0x0221, 38, 33, 0 },
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{ 0x5601, 7, 6, 1 },
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{ 0x5401, 8, 14, 0 },
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{ 0x4801, 9, 14, 0 },
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{ 0x3801, 10, 14, 0 },
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{ 0x3001, 11, 17, 0 },
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{ 0x2401, 12, 18, 0 },
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{ 0x1C01, 13, 20, 0 },
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{ 0x1601, 29, 21, 0 },
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{ 0x5601, 15, 14, 1 },
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{ 0x5401, 16, 14, 0 },
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{ 0x5101, 17, 15, 0 },
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{ 0x4801, 18, 16, 0 },
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{ 0x3801, 19, 17, 0 },
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{ 0x3401, 20, 18, 0 },
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{ 0x3001, 21, 19, 0 },
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{ 0x2801, 22, 19, 0 },
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{ 0x2401, 23, 20, 0 },
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{ 0x2201, 24, 21, 0 },
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{ 0x1C01, 25, 22, 0 },
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{ 0x1801, 26, 23, 0 },
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{ 0x1601, 27, 24, 0 },
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{ 0x1401, 28, 25, 0 },
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{ 0x1201, 29, 26, 0 },
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{ 0x1101, 30, 27, 0 },
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{ 0x0AC1, 31, 28, 0 },
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{ 0x09C1, 32, 29, 0 },
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{ 0x08A1, 33, 30, 0 },
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{ 0x0521, 34, 31, 0 },
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{ 0x0441, 35, 32, 0 },
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{ 0x02A1, 36, 33, 0 },
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{ 0x0221, 37, 34, 0 },
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{ 0x0141, 38, 35, 0 },
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{ 0x0111, 39, 36, 0 },
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{ 0x0085, 40, 37, 0 },
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{ 0x0049, 41, 38, 0 },
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{ 0x0025, 42, 39, 0 },
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{ 0x0015, 43, 40, 0 },
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{ 0x0009, 44, 41, 0 },
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{ 0x0005, 45, 42, 0 },
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{ 0x0001, 45, 43, 0 },
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{ 0x5601, 46, 46, 0 }
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};
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uint16_t ff_mqc_qe [2 * 47];
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uint8_t ff_mqc_nlps[2 * 47];
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uint8_t ff_mqc_nmps[2 * 47];
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void ff_mqc_init_contexts(MqcState *mqc)
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{
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int i;
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memset(mqc->cx_states, 0, sizeof(mqc->cx_states));
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mqc->cx_states[MQC_CX_UNI] = 2 * 46;
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mqc->cx_states[MQC_CX_RL] = 2 * 3;
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mqc->cx_states[0] = 2 * 4;
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for (i = 0; i < 47; i++) {
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ff_mqc_qe[2 * i] =
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ff_mqc_qe[2 * i + 1] = cx_states[i].qe;
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ff_mqc_nlps[2 * i] = 2 * cx_states[i].nlps + cx_states[i].sw;
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ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw;
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ff_mqc_nmps[2 * i] = 2 * cx_states[i].nmps;
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ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1;
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}
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}
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