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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* SPDX-License-Identifier: GPL-3.0-or-later
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "atsc_field_sync_mux_impl.h"
#include "gnuradio/dtv/atsc_consts.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace dtv {
atsc_field_sync_mux::sptr atsc_field_sync_mux::make()
{
return gnuradio::make_block_sptr<atsc_field_sync_mux_impl>();
}
atsc_field_sync_mux_impl::atsc_field_sync_mux_impl()
: gr::block("atsc_field_sync_mux",
gr::io_signature::make(1, 1, sizeof(atsc_data_segment)),
gr::io_signature::make(1, 1, sizeof(atsc_data_segment)))
{
d_already_output_field_sync = false;
for (int i = 0; i < N_SAVED_SYMBOLS; i++) {
d_saved_symbols[i] = 0;
}
}
atsc_field_sync_mux_impl::~atsc_field_sync_mux_impl() {}
void atsc_field_sync_mux_impl::init_field_sync_common(
unsigned char* p, int mask, const unsigned char saved_symbols[N_SAVED_SYMBOLS])
{
static const unsigned char bin_map[2] = { 1,
6 }; // map binary values to 1 of 8 levels
int i = 0;
p[i++] = bin_map[1]; // data segment sync pulse
p[i++] = bin_map[0];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
for (int j = 0; j < 511; j++) { // PN511
p[i++] = bin_map[atsc_pn511[j]];
}
for (int j = 0; j < 63; j++) { // PN63
p[i++] = bin_map[atsc_pn63[j]];
}
for (int j = 0; j < 63; j++) { // PN63, toggled on field 2
p[i++] = bin_map[atsc_pn63[j] ^ mask];
}
for (int j = 0; j < 63; j++) { // PN63
p[i++] = bin_map[atsc_pn63[j]];
}
p[i++] = bin_map[0]; // 24 bits of 8VSB mode identifier
p[i++] = bin_map[0];
p[i++] = bin_map[0];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[1];
p[i++] = bin_map[1];
p[i++] = bin_map[1];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
p[i++] = bin_map[1];
p[i++] = bin_map[0];
for (int j = 0; j < 92; j++) { // 92 more bits
p[i++] = bin_map[atsc_pn63[j % 63]];
}
// now copy the last 12 symbols of the previous segment
for (int j = 0; j < N_SAVED_SYMBOLS; j++) {
p[i++] = saved_symbols[j];
}
assert(i == ATSC_DATA_SEGMENT_LENGTH);
}
inline void atsc_field_sync_mux_impl::init_field_sync_1(
atsc_data_segment* s, const unsigned char saved_symbols[N_SAVED_SYMBOLS])
{
init_field_sync_common(&s->data[0], 0, saved_symbols);
}
inline void atsc_field_sync_mux_impl::init_field_sync_2(
atsc_data_segment* s, const unsigned char saved_symbols[N_SAVED_SYMBOLS])
{
init_field_sync_common(&s->data[0], 1, saved_symbols);
}
void atsc_field_sync_mux_impl::save_last_symbols(
unsigned char saved_symbols[N_SAVED_SYMBOLS], const atsc_data_segment& seg)
{
for (int i = 0; i < N_SAVED_SYMBOLS; i++) {
saved_symbols[i] = seg.data[i + ATSC_DATA_SEGMENT_LENGTH - N_SAVED_SYMBOLS];
}
}
inline bool atsc_field_sync_mux_impl::last_regular_seg_p(const plinfo& pli)
{
return pli.regular_seg_p() && (pli.segno() == ATSC_DSEGS_PER_FIELD - 1);
}
void atsc_field_sync_mux_impl::forecast(int noutput_items,
gr_vector_int& ninput_items_required)
{
ninput_items_required[0] = noutput_items;
}
int atsc_field_sync_mux_impl::general_work(int noutput_items,
gr_vector_int& ninput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
const atsc_data_segment* in = (const atsc_data_segment*)input_items[0];
atsc_data_segment* out = (atsc_data_segment*)output_items[0];
int in_length = ninput_items[0];
int index = 0;
int outdex = 0;
for (outdex = 0; outdex < noutput_items && index < in_length; outdex++) {
assert(in[index].pli.regular_seg_p());
if (!in[index].pli.first_regular_seg_p()) {
out[outdex] = in[index]; // just copy in to out
if (last_regular_seg_p(in[index].pli)) {
save_last_symbols(d_saved_symbols, in[index]);
}
index++;
} else { // first_regular_seg_p
if (!d_already_output_field_sync) {
// write out field sync...
atsc_data_segment field_sync;
field_sync.pli.reset();
memset(field_sync._pad_, 0, atsc_data_segment::NPAD);
if (in[index].pli.in_field1_p()) {
init_field_sync_1(&field_sync, d_saved_symbols);
} else {
init_field_sync_2(&field_sync, d_saved_symbols);
}
// note that index doesn't advance in this branch
out[outdex] = field_sync;
d_already_output_field_sync = true;
} else {
// already output field sync, now output first regular segment
out[outdex] = in[index];
index++;
d_already_output_field_sync = false;
}
}
}
// Tell runtime system how many input items we consumed on
// each input stream.
consume_each(index);
// Tell runtime system how many output items we produced.
return outdex;
}
} /* namespace dtv */
} /* namespace gr */
|
