Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
4349 | Serge | 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 |
||
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 */ |