blob: f2d1e3b83881f04d4dae8b84c1b5a04ab2df97c8
1 | /* |
2 | * MQ-coder encoder and decoder common 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 | /** |
23 | * MQ-coder common (decoder/encoder) functions |
24 | * @file |
25 | * @author Kamil Nowosad |
26 | */ |
27 | |
28 | #include <string.h> |
29 | #include <stdint.h> |
30 | |
31 | #include "libavutil/attributes.h" |
32 | |
33 | #include "mqc.h" |
34 | |
35 | /* MQ coder context state structure */ |
36 | typedef struct MqcCxState { |
37 | uint16_t qe; |
38 | uint8_t nmps; |
39 | uint8_t nlps; |
40 | uint8_t sw; |
41 | } MqcCxState; |
42 | |
43 | static const MqcCxState cx_states[47] = { |
44 | { 0x5601, 1, 1, 1 }, |
45 | { 0x3401, 2, 6, 0 }, |
46 | { 0x1801, 3, 9, 0 }, |
47 | { 0x0AC1, 4, 12, 0 }, |
48 | { 0x0521, 5, 29, 0 }, |
49 | { 0x0221, 38, 33, 0 }, |
50 | { 0x5601, 7, 6, 1 }, |
51 | { 0x5401, 8, 14, 0 }, |
52 | { 0x4801, 9, 14, 0 }, |
53 | { 0x3801, 10, 14, 0 }, |
54 | { 0x3001, 11, 17, 0 }, |
55 | { 0x2401, 12, 18, 0 }, |
56 | { 0x1C01, 13, 20, 0 }, |
57 | { 0x1601, 29, 21, 0 }, |
58 | { 0x5601, 15, 14, 1 }, |
59 | { 0x5401, 16, 14, 0 }, |
60 | { 0x5101, 17, 15, 0 }, |
61 | { 0x4801, 18, 16, 0 }, |
62 | { 0x3801, 19, 17, 0 }, |
63 | { 0x3401, 20, 18, 0 }, |
64 | { 0x3001, 21, 19, 0 }, |
65 | { 0x2801, 22, 19, 0 }, |
66 | { 0x2401, 23, 20, 0 }, |
67 | { 0x2201, 24, 21, 0 }, |
68 | { 0x1C01, 25, 22, 0 }, |
69 | { 0x1801, 26, 23, 0 }, |
70 | { 0x1601, 27, 24, 0 }, |
71 | { 0x1401, 28, 25, 0 }, |
72 | { 0x1201, 29, 26, 0 }, |
73 | { 0x1101, 30, 27, 0 }, |
74 | { 0x0AC1, 31, 28, 0 }, |
75 | { 0x09C1, 32, 29, 0 }, |
76 | { 0x08A1, 33, 30, 0 }, |
77 | { 0x0521, 34, 31, 0 }, |
78 | { 0x0441, 35, 32, 0 }, |
79 | { 0x02A1, 36, 33, 0 }, |
80 | { 0x0221, 37, 34, 0 }, |
81 | { 0x0141, 38, 35, 0 }, |
82 | { 0x0111, 39, 36, 0 }, |
83 | { 0x0085, 40, 37, 0 }, |
84 | { 0x0049, 41, 38, 0 }, |
85 | { 0x0025, 42, 39, 0 }, |
86 | { 0x0015, 43, 40, 0 }, |
87 | { 0x0009, 44, 41, 0 }, |
88 | { 0x0005, 45, 42, 0 }, |
89 | { 0x0001, 45, 43, 0 }, |
90 | { 0x5601, 46, 46, 0 } |
91 | }; |
92 | |
93 | uint16_t ff_mqc_qe [2 * 47]; |
94 | uint8_t ff_mqc_nlps[2 * 47]; |
95 | uint8_t ff_mqc_nmps[2 * 47]; |
96 | |
97 | void av_cold ff_mqc_init_context_tables(void) |
98 | { |
99 | int i; |
100 | for (i = 0; i < 47; i++) { |
101 | ff_mqc_qe[2 * i] = |
102 | ff_mqc_qe[2 * i + 1] = cx_states[i].qe; |
103 | |
104 | ff_mqc_nlps[2 * i] = 2 * cx_states[i].nlps + cx_states[i].sw; |
105 | ff_mqc_nlps[2 * i + 1] = 2 * cx_states[i].nlps + 1 - cx_states[i].sw; |
106 | ff_mqc_nmps[2 * i] = 2 * cx_states[i].nmps; |
107 | ff_mqc_nmps[2 * i + 1] = 2 * cx_states[i].nmps + 1; |
108 | } |
109 | } |
110 | |
111 | void ff_mqc_init_contexts(MqcState *mqc) |
112 | { |
113 | memset(mqc->cx_states, 0, sizeof(mqc->cx_states)); |
114 | mqc->cx_states[MQC_CX_UNI] = 2 * 46; |
115 | mqc->cx_states[MQC_CX_RL] = 2 * 3; |
116 | mqc->cx_states[0] = 2 * 4; |
117 | } |
118 |