1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* MLP codec common code
* Copyright (c) 2007-2008 Ian Caulfield
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include "libavutil/channel_layout.h"
#include "libavutil/crc.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/thread.h"
#include "mlp.h"
const uint8_t ff_mlp_huffman_tables[3][18][2] = {
{ /* Huffman table 0, -7 - +10 */
{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
{0x04, 3}, {0x05, 3}, {0x06, 3}, {0x07, 3},
{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
}, { /* Huffman table 1, -7 - +8 */
{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
{0x02, 2}, {0x03, 2},
{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
}, { /* Huffman table 2, -7 - +7 */
{0x01, 9}, {0x01, 8}, {0x01, 7}, {0x01, 6}, {0x01, 5}, {0x01, 4}, {0x01, 3},
{0x01, 1},
{0x03, 3}, {0x05, 4}, {0x09, 5}, {0x11, 6}, {0x21, 7}, {0x41, 8}, {0x81, 9},
}
};
const ChannelInformation ff_mlp_ch_info[21] = {
{ 0x01, 0x01, 0x00, 0x1f }, { 0x03, 0x02, 0x00, 0x1b },
{ 0x07, 0x02, 0x01, 0x1f }, { 0x0F, 0x02, 0x02, 0x19 },
{ 0x07, 0x02, 0x01, 0x03 }, { 0x0F, 0x02, 0x02, 0x1f },
{ 0x1F, 0x02, 0x03, 0x01 }, { 0x07, 0x02, 0x01, 0x1a },
{ 0x0F, 0x02, 0x02, 0x1f }, { 0x1F, 0x02, 0x03, 0x18 },
{ 0x0F, 0x02, 0x02, 0x02 }, { 0x1F, 0x02, 0x03, 0x1f },
{ 0x3F, 0x02, 0x04, 0x00 }, { 0x0F, 0x03, 0x01, 0x1f },
{ 0x1F, 0x03, 0x02, 0x18 }, { 0x0F, 0x03, 0x01, 0x02 },
{ 0x1F, 0x03, 0x02, 0x1f }, { 0x3F, 0x03, 0x03, 0x00 },
{ 0x1F, 0x04, 0x01, 0x01 }, { 0x1F, 0x04, 0x01, 0x18 },
{ 0x3F, 0x04, 0x02, 0x00 },
};
#if FF_API_OLD_CHANNEL_LAYOUT
const uint64_t ff_mlp_channel_layouts[12] = {
AV_CH_LAYOUT_MONO, AV_CH_LAYOUT_STEREO, AV_CH_LAYOUT_2_1,
AV_CH_LAYOUT_QUAD, AV_CH_LAYOUT_2POINT1, AV_CH_LAYOUT_SURROUND,
AV_CH_LAYOUT_4POINT0, AV_CH_LAYOUT_5POINT0_BACK, AV_CH_LAYOUT_3POINT1,
AV_CH_LAYOUT_4POINT1, AV_CH_LAYOUT_5POINT1_BACK, 0,
};
#endif
const AVChannelLayout ff_mlp_ch_layouts[12] = {
AV_CHANNEL_LAYOUT_MONO, AV_CHANNEL_LAYOUT_STEREO, AV_CHANNEL_LAYOUT_2_1,
AV_CHANNEL_LAYOUT_QUAD, AV_CHANNEL_LAYOUT_2POINT1, AV_CHANNEL_LAYOUT_SURROUND,
AV_CHANNEL_LAYOUT_4POINT0, AV_CHANNEL_LAYOUT_5POINT0_BACK, AV_CHANNEL_LAYOUT_3POINT1,
AV_CHANNEL_LAYOUT_4POINT1, AV_CHANNEL_LAYOUT_5POINT1_BACK, { 0 },
};
#if CONFIG_SMALL
#define CRC_TABLE_SIZE 257
#else
#define CRC_TABLE_SIZE 1024
#endif
static AVCRC crc_63[CRC_TABLE_SIZE];
static AVCRC crc_1D[CRC_TABLE_SIZE];
static AVCRC crc_2D[CRC_TABLE_SIZE];
static av_cold void mlp_init_crc(void)
{
av_crc_init(crc_63, 0, 8, 0x63, sizeof(crc_63));
av_crc_init(crc_1D, 0, 8, 0x1D, sizeof(crc_1D));
av_crc_init(crc_2D, 0, 16, 0x002D, sizeof(crc_2D));
}
av_cold void ff_mlp_init_crc(void)
{
static AVOnce init_static_once = AV_ONCE_INIT;
ff_thread_once(&init_static_once, mlp_init_crc);
}
uint16_t ff_mlp_checksum16(const uint8_t *buf, unsigned int buf_size)
{
uint16_t crc;
crc = av_crc(crc_2D, 0, buf, buf_size - 2);
crc ^= AV_RL16(buf + buf_size - 2);
return crc;
}
uint8_t ff_mlp_checksum8(const uint8_t *buf, unsigned int buf_size)
{
uint8_t checksum = av_crc(crc_63, 0x3c, buf, buf_size - 1); // crc_63[0xa2] == 0x3c
checksum ^= buf[buf_size-1];
return checksum;
}
uint8_t ff_mlp_restart_checksum(const uint8_t *buf, unsigned int bit_size)
{
int i;
int num_bytes = (bit_size + 2) / 8;
int crc = crc_1D[buf[0] & 0x3f];
crc = av_crc(crc_1D, crc, buf + 1, num_bytes - 2);
crc ^= buf[num_bytes - 1];
for (i = 0; i < ((bit_size + 2) & 7); i++) {
crc <<= 1;
if (crc & 0x100)
crc ^= 0x11D;
crc ^= (buf[num_bytes] >> (7 - i)) & 1;
}
return crc;
}
uint8_t ff_mlp_calculate_parity(const uint8_t *buf, unsigned int buf_size)
{
uint32_t scratch = 0;
const uint8_t *buf_end = buf + buf_size;
for (; ((intptr_t) buf & 3) && buf < buf_end; buf++)
scratch ^= *buf;
for (; buf < buf_end - 3; buf += 4)
scratch ^= *((const uint32_t*)buf);
scratch = xor_32_to_8(scratch);
for (; buf < buf_end; buf++)
scratch ^= *buf;
return scratch;
}
|
