1 /* 2 * MQ-coder: structures, common and decoder functions 3 * Copyright (c) 2007 Kamil Nowosad 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22 #ifndef AVCODEC_MQC_H 23 #define AVCODEC_MQC_H 24 25 /** 26 * MQ-coder 27 * @file 28 * @author Kamil Nowosad 29 */ 30 31 #include <stdint.h> 32 33 #define MQC_CX_UNI 17 34 #define MQC_CX_RL 18 35 36 extern uint16_t ff_mqc_qe[2 * 47]; 37 extern uint8_t ff_mqc_nlps[2 * 47]; 38 extern uint8_t ff_mqc_nmps[2 * 47]; 39 40 typedef struct MqcState { 41 uint8_t *bp, *bpstart; 42 unsigned int a; 43 unsigned int c; 44 unsigned int ct; 45 uint8_t cx_states[19]; 46 int raw; 47 } MqcState; 48 49 /* encoder */ 50 51 /** initialize the encoder */ 52 void ff_mqc_initenc(MqcState *mqc, uint8_t *bp); 53 54 /** code bit d with context cx */ 55 void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d); 56 57 /** flush the encoder [returns number of bytes encoded] */ 58 int ff_mqc_flush(MqcState *mqc); 59 int ff_mqc_flush_to(MqcState *mqc, uint8_t *dst, int *dst_len); 60 61 /* decoder */ 62 63 /** 64 * Initialize MQ-decoder. 65 * @param mqc MQ decoder state 66 * @param bp byte pointer 67 * @param raw raw mode 68 * @param reset reset states 69 */ 70 void ff_mqc_initdec(MqcState *mqc, uint8_t *bp, int raw, int reset); 71 72 /** 73 * MQ decoder. 74 * @param mqc MQ decoder state 75 * @param cxstate Context 76 * @return Decision (0 to 1) 77 */ 78 int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate); 79 80 /* common */ 81 82 /** 83 * MQ-coder Initialize context tables (QE, NLPS, NMPS) 84 */ 85 void ff_mqc_init_context_tables(void); 86 87 /** 88 * MQ-coder context initialisations. 89 * @param mqc MQ-coder context 90 */ 91 void ff_mqc_init_contexts(MqcState *mqc); 92 93 #endif /* AVCODEC_MQC_H */ 94