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mqc.h
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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 {
42  unsigned int a;
43  unsigned int c;
44  unsigned int ct;
46 } MqcState;
47 
48 /* encoder */
49 
50 /** initialize the encoder */
51 void ff_mqc_initenc(MqcState *mqc, uint8_t *bp);
52 
53 /** code bit d with context cx */
54 void ff_mqc_encode(MqcState *mqc, uint8_t *cxstate, int d);
55 
56 /** number of encoded bytes */
57 int ff_mqc_length(MqcState *mqc);
58 
59 /** flush the encoder [returns number of bytes encoded] */
60 int ff_mqc_flush(MqcState *mqc);
61 
62 /* decoder */
63 
64 /**
65  * Initialize MQ-decoder.
66  * @param mqc MQ decoder state
67  * @param bp byte poiter
68  */
69 void ff_mqc_initdec(MqcState *mqc, uint8_t *bp);
70 
71 /**
72  * MQ decoder.
73  * @param mqc MQ decoder state
74  * @param cxstate Context
75  * @return Decision (0 ot 1)
76  */
77 int ff_mqc_decode(MqcState *mqc, uint8_t *cxstate);
78 
79 /* common */
80 
81 /**
82  * MQ-coder context initialisations.
83  * @param mqc MQ-coder context
84  */
86 
87 #endif /* AVCODEC_MQC_H */