aac5773f
 hucm
功能基本完成，接口待打磨
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/*
* MQ-coder: structures, common and decoder functions
* Copyright (c) 2007 Kamil Nowosad
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_MQC_H
#define AVCODEC_MQC_H
/**
* MQ-coder
* @file
* @author Kamil Nowosad
*/
#include <stdint.h>
#define MQC_CX_UNI 17
#define MQC_CX_RL 18
extern uint16_t ff_mqc_qe[2 * 47];
extern uint8_t ff_mqc_nlps[2 * 47];
extern uint8_t ff_mqc_nmps[2 * 47];
typedef struct MqcState {
uint8_t *bp, *bpstart;
unsigned int a;
unsigned int c;
unsigned int ct;
uint8_t cx_states[19];
int raw;
} MqcState;
/* encoder */
/** initialize the encoder */
void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
/** code bit d with context cx */
void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
/** number of encoded bytes */
int ff_mqc_length(MqcState *mqc);
/** flush the encoder [returns number of bytes encoded] */
int ff_mqc_flush(MqcState *mqc);
int ff_mqc_flush_to(MqcState *mqc, uint8_t *dst, int *dst_len);
/* decoder */
/**
* Initialize MQ-decoder.
* @param mqc MQ decoder state
* @param bp byte pointer
* @param raw raw mode
* @param reset reset states
*/
void ff_mqc_initdec(MqcState *mqc, uint8_t *bp, int raw, int reset);
/**
* MQ decoder.
* @param mqc MQ decoder state
* @param cxstate Context
* @return Decision (0 to 1)
*/
int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
/* common */
/**
* MQ-coder Initialize context tables (QE, NLPS, NMPS)
*/
void ff_mqc_init_context_tables(void);
/**
* MQ-coder context initialisations.
* @param mqc MQ-coder context
*/
void ff_mqc_init_contexts(MqcState *mqc);
#endif /* AVCODEC_MQC_H */
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