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
ff_mqc_init_context_tables(void)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
ff_mqc_init_contexts(MqcState * mqc)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