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
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*---------------------------------------------------------------------------*\
FILE........: fdmdv_put_test_bits.c
AUTHOR......: David Rowe
DATE CREATED: 1 May 2012
Using a file of packed test bits as input, determines bit error
rate. Useful for testing fdmdv_demod.
\*---------------------------------------------------------------------------*/
/*
Copyright (C) 2012 David Rowe
All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License version 2.1, as
published by the Free Software Foundation. This program 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 Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <errno.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "codec2_fdmdv.h"
int main(int argc, char *argv[]) {
FILE *fin;
struct FDMDV *fdmdv;
char *packed_bits;
int *rx_bits;
int i, bit, byte;
int test_frame_sync, bit_errors, total_bit_errors, total_bits, ntest_bits;
int test_frame_sync_state, test_frame_count;
int bits_per_fdmdv_frame;
int bits_per_codec_frame;
int bytes_per_codec_frame;
int Nc;
short *error_pattern;
if (argc < 2) {
printf("usage: %s InputBitFile [Nc]\n", argv[0]);
printf("e.g %s test.c2\n", argv[0]);
exit(1);
}
if (strcmp(argv[1], "-") == 0)
fin = stdin;
else if ((fin = fopen(argv[1], "rb")) == NULL) {
fprintf(stderr, "Error opening input bit file: %s: %s.\n", argv[1],
strerror(errno));
exit(1);
}
if (argc == 3) {
Nc = atoi(argv[2]);
if ((Nc < 2) || (Nc > FDMDV_NC_MAX)) {
fprintf(stderr, "Error number of carriers must be between 2 and %d\n",
FDMDV_NC_MAX);
exit(1);
}
} else
Nc = FDMDV_NC;
fdmdv = fdmdv_create(Nc);
bits_per_fdmdv_frame = fdmdv_bits_per_frame(fdmdv);
bits_per_codec_frame = 2 * fdmdv_bits_per_frame(fdmdv);
bytes_per_codec_frame = (bits_per_codec_frame + 7) / 8;
fprintf(stderr,
"bits_per_fdmdv_frame: %d bits_per_codec_frame: %d "
"bytes_per_codec_frame: %d\n",
bits_per_fdmdv_frame, bits_per_codec_frame, bytes_per_codec_frame);
packed_bits = (char *)malloc(bytes_per_codec_frame);
assert(packed_bits != NULL);
rx_bits = (int *)malloc(sizeof(int) * bits_per_codec_frame);
assert(rx_bits != NULL);
error_pattern =
(short *)malloc(fdmdv_error_pattern_size(fdmdv) * sizeof(int));
assert(error_pattern != NULL);
total_bit_errors = 0;
total_bits = 0;
test_frame_sync_state = 0;
test_frame_count = 0;
while (fread(packed_bits, sizeof(char), bytes_per_codec_frame, fin) ==
bytes_per_codec_frame) {
/* unpack bits, MSB first */
bit = 7;
byte = 0;
for (i = 0; i < bits_per_codec_frame; i++) {
rx_bits[i] = (packed_bits[byte] >> bit) & 0x1;
// printf("%d 0x%x %d\n", i, packed_bits[byte], rx_bits[i]);
bit--;
if (bit < 0) {
bit = 7;
byte++;
}
}
fdmdv_put_test_bits(fdmdv, &test_frame_sync, error_pattern, &bit_errors,
&ntest_bits, rx_bits);
if (test_frame_sync == 1) {
test_frame_sync_state = 1;
test_frame_count = 0;
}
if (test_frame_sync_state) {
if (test_frame_count == 0) {
total_bit_errors += bit_errors;
total_bits = total_bits + ntest_bits;
printf("+");
} else
printf("-");
test_frame_count++;
if (test_frame_count == 4) test_frame_count = 0;
} else
printf("-");
fdmdv_put_test_bits(fdmdv, &test_frame_sync, error_pattern, &bit_errors,
&ntest_bits, &rx_bits[bits_per_fdmdv_frame]);
if (test_frame_sync == 1) {
test_frame_sync_state = 1;
test_frame_count = 0;
}
if (test_frame_sync_state) {
if (test_frame_count == 0) {
total_bit_errors += bit_errors;
total_bits = total_bits + ntest_bits;
printf("+");
} else
printf("-");
test_frame_count++;
if (test_frame_count == 4) test_frame_count = 0;
} else
printf("-");
}
fclose(fin);
free(error_pattern);
fdmdv_destroy(fdmdv);
printf("\nbits %d errors %d BER %1.4f\n", total_bits, total_bit_errors,
(float)total_bit_errors / (1E-6 + total_bits));
if (packed_bits != NULL) free(packed_bits);
return 0;
}
|
