forked from KolibriOS/kolibrios
93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
/*
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* MQ-coder: structures, common and decoder functions
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* Copyright (c) 2007 Kamil Nowosad
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#ifndef AVCODEC_MQC_H
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#define AVCODEC_MQC_H
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/**
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* MQ-coder
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* @file
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* @author Kamil Nowosad
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*/
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#include <stdint.h>
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#define MQC_CX_UNI 17
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#define MQC_CX_RL 18
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extern uint16_t ff_mqc_qe[2 * 47];
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extern uint8_t ff_mqc_nlps[2 * 47];
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extern uint8_t ff_mqc_nmps[2 * 47];
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typedef struct MqcState {
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uint8_t *bp, *bpstart;
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unsigned int a;
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unsigned int c;
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unsigned int ct;
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uint8_t cx_states[19];
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} MqcState;
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/* encoder */
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/** initialize the encoder */
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void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
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/** code bit d with context cx */
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void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
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/** number of encoded bytes */
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int ff_mqc_length(MqcState *mqc);
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/** flush the encoder [returns number of bytes encoded] */
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int ff_mqc_flush(MqcState *mqc);
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/* decoder */
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/**
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* Initialize MQ-decoder.
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* @param mqc MQ decoder state
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* @param bp byte poiter
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*/
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void ff_mqc_initdec(MqcState *mqc, uint8_t *bp);
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/**
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* MQ decoder.
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* @param mqc MQ decoder state
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* @param cxstate Context
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* @return Decision (0 ot 1)
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*/
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int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
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/* common */
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/**
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* MQ-coder Initialize context tables (QE, NLPS, NMPS)
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*/
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void ff_mqc_init_context_tables(void);
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/**
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* MQ-coder context initialisations.
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* @param mqc MQ-coder context
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*/
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void ff_mqc_init_contexts(MqcState *mqc);
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#endif /* AVCODEC_MQC_H */
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