/* * 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]; } 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); /* decoder */ /** * Initialize MQ-decoder. * @param mqc MQ decoder state * @param bp byte poiter */ void ff_mqc_initdec(MqcState *mqc, uint8_t *bp); /** * MQ decoder. * @param mqc MQ decoder state * @param cxstate Context * @return Decision (0 ot 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 */