2 * MQ-coder: structures, common and decoder functions
3 * Copyright (c) 2007 Kamil Nowosad
5 * This file is part of FFmpeg.
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.
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.
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
28 * @author Kamil Nowosad
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];
40 typedef struct MqcState {
41 uint8_t *bp, *bpstart;
45 uint8_t cx_states[19];
51 /** initialize the encoder */
52 void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
54 /** code bit d with context cx */
55 void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
57 /** number of encoded bytes */
58 int ff_mqc_length(MqcState *mqc);
60 /** flush the encoder [returns number of bytes encoded] */
61 int ff_mqc_flush(MqcState *mqc);
66 * Initialize MQ-decoder.
67 * @param mqc MQ decoder state
68 * @param bp byte poiter
70 * @param reset reset states
72 void ff_mqc_initdec(MqcState *mqc, uint8_t *bp, int raw, int reset);
76 * @param mqc MQ decoder state
77 * @param cxstate Context
78 * @return Decision (0 ot 1)
80 int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
85 * MQ-coder Initialize context tables (QE, NLPS, NMPS)
87 void ff_mqc_init_context_tables(void);
90 * MQ-coder context initialisations.
91 * @param mqc MQ-coder context
93 void ff_mqc_init_contexts(MqcState *mqc);
95 #endif /* AVCODEC_MQC_H */