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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 { | |
41 | uint8_t *bp, *bpstart; | |
42 | unsigned int a; | |
43 | unsigned int c; | |
44 | unsigned int ct; | |
45 | uint8_t cx_states[19]; | |
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 Initialize context tables (QE, NLPS, NMPS) | |
83 | */ | |
84 | void ff_mqc_init_context_tables(void); | |
85 | ||
86 | /** | |
87 | * MQ-coder context initialisations. | |
88 | * @param mqc MQ-coder context | |
89 | */ | |
90 | void ff_mqc_init_contexts(MqcState *mqc); | |
91 | ||
92 | #endif /* AVCODEC_MQC_H */ |