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
150
|
/*
Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011 Her Majesty
the Queen in Right of Canada (Communications Research Center Canada)
*/
/*
This file is part of ODR-DabMod.
ODR-DabMod is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
ODR-DabMod 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with ODR-DabMod. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ConvEncoder.h"
#include "PcDebug.h"
#include <stdlib.h>
#include <stdio.h>
#include <stdexcept>
const static unsigned char PARITY[] = {
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1,
0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 1, 0, 1, 1, 0
};
ConvEncoder::ConvEncoder(size_t framesize) :
ModCodec(ModFormat(framesize), ModFormat((framesize * 4) + 3)),
d_framesize(framesize)
{
PDEBUG("ConvEncoder::ConvEncoder(%zu)\n", framesize);
}
ConvEncoder::~ConvEncoder()
{
PDEBUG("ConvEncoder::~ConvEncoder()\n");
}
int ConvEncoder::process(Buffer* const dataIn, Buffer* dataOut)
{
PDEBUG("ConvEncoder::process"
"(dataIn: %p, dataOut: %p)\n",
dataIn, dataOut);
size_t in_block_size = d_framesize;
size_t out_block_size = (d_framesize * 4) + 3;
size_t in_offset = 0;
size_t out_offset = 0;
unsigned short memory = 0;
unsigned char data;
if (dataIn->getLength() != in_block_size) {
PDEBUG("%zu != %zu != 0\n", dataIn->getLength(), in_block_size);
throw std::runtime_error(
"ConvEncoder::process input size not valid!\n");
}
dataOut->setLength(out_block_size);
const unsigned char* in = reinterpret_cast<const unsigned char*>(dataIn->getData());
unsigned char* out = reinterpret_cast<unsigned char*>(dataOut->getData());
// While there is enought input and ouput items
while (dataIn->getLength() - in_offset >= in_block_size &&
dataOut->getLength() - out_offset >= out_block_size) {
for (size_t in_count = 0; in_count < in_block_size; ++in_count) {
data = in[in_offset];
//PDEBUG("Input: 0x%x\n", data);
// For next 4 output bytes
for (unsigned out_count = 0; out_count < 4; ++out_count) {
out[out_offset] = 0;
// For each 4-bit output word
for (unsigned j = 0; j < 2; ++j) {
memory >>= 1;
memory |= (data >> 7) << 6;
data <<= 1;
//PDEBUG("Memory: 0x%x\n", memory);
unsigned char poly[4] = {
(unsigned char)(memory & 0x5b),
(unsigned char)(memory & 0x79),
(unsigned char)(memory & 0x65),
(unsigned char)(memory & 0x5b)
};
//PDEBUG("Polys: 0x%x, 0x%x, 0x%x, 0x%x\n", poly[0], poly[1], poly[2], poly[3]);
// For each poly
for (unsigned k = 0; k < 4; ++k) {
out[out_offset] <<= 1;
out[out_offset] |= PARITY[poly[k]];
//PDEBUG("Out bit: %i\n", out[no] >> 7);
}
}
//PDEBUG("Out: 0x%x\n", out[no]);
++out_offset;
}
++in_offset;
}
for (unsigned pad_count = 0; pad_count < 3; ++pad_count) {
out[out_offset] = 0;
// For each 4-bit output word
for (unsigned j = 0; j < 2; ++j) {
memory >>= 1;
//PDEBUG("Memory: 0x%x\n", memory);
unsigned char poly[4] = {
(unsigned char)(memory & 0x5b),
(unsigned char)(memory & 0x79),
(unsigned char)(memory & 0x65),
(unsigned char)(memory & 0x5b)
};
//PDEBUG("Polys: 0x%x, 0x%x, 0x%x, 0x%x\n", poly[0], poly[1], poly[2], poly[3]);
// For each poly
for (unsigned k = 0; k < 4; ++k) {
out[out_offset] <<= 1;
out[out_offset] |= PARITY[poly[k]];
//PDEBUG("Out bit: %i\n", out[no] >> 7);
}
}
//PDEBUG("Out: 0x%x\n", out[no]);
++out_offset;
}
}
PDEBUG(" Consume: %zu\n", in_offset);
PDEBUG(" Return: %zu\n", out_offset);
return out_offset;
}
|
