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
198
199
200
201
202
203
204
205
206
207
208
209
|
/* -*- c++ -*- */
/*
* Copyright 2006 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio 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, or (at your option)
* any later version.
*
* GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <cmath>
#include <atsc_field_sync_demux.h>
#include <gr_io_signature.h>
#include <atsc_types.h>
#include <atsc_consts.h>
#include <atsci_syminfo.h>
#include <stdio.h>
#include <assert.h>
#include <iostream>
using std::cerr;
using std::endl;
static const int DEC = ATSC_DATA_SEGMENT_LENGTH; // nominal decimation factor
atsc_field_sync_demux_sptr
atsc_make_field_sync_demux()
{
return atsc_field_sync_demux_sptr(new atsc_field_sync_demux());
}
atsc_field_sync_demux::atsc_field_sync_demux()
: gr_block("atsc_field_sync_demux",
gr_make_io_signature(2, 2, sizeof(float)),
gr_make_io_signature(1, 1, sizeof(atsc_soft_data_segment))),
d_locked(false), d_in_field2(true), d_segment_number(0),
d_next_input(0), d_lost_index(0), d_inputs0_size(0),
d_inputs0_index(0), d_consume(0)
{
reset();
}
inline static bool
tag_is_seg_sync_or_field_sync (atsc::syminfo tag)
{
return tag.symbol_num == 0 && tag.valid;
}
void
atsc_field_sync_demux::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
unsigned ninputs = ninput_items_required.size();
for (unsigned i = 0; i < ninputs; i++) {
ninput_items_required[i] = noutput_items * DEC + 2 * DEC ;
d_inputs0_index = d_next_input;
d_inputs0_size = noutput_items * DEC + 2 * DEC ;
}
}
int
atsc_field_sync_demux::general_work (int noutput_items,
gr_vector_int &ninput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int r = work (noutput_items, input_items, output_items);
consume_each (d_consume);
// printf("Consumed: %d, produced: %d\n",d_consume,r);
// we consume input even if no output is produced
// while looking for sync
return r;
}
int
atsc_field_sync_demux::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
float *in = (float *) input_items[0];
atsc::syminfo *input_tags = (atsc::syminfo *) input_items[1];
atsc_soft_data_segment *out = (atsc_soft_data_segment *) output_items[0];
assert(sizeof(float) == sizeof(atsc::syminfo));
int ii = 0; // input index
// Are we in sync?
if (!tag_is_seg_sync_or_field_sync (input_tags[0])){ // No ...
if (d_locked){
d_locked = false;
d_lost_index = d_inputs0_index + ii;
cerr << "atsc_field_sync_demux: lost sync at "
<< d_lost_index << endl;
}
// ... search for beginning of a field sync
// cerr << "atsc_field_sync_demux: searching for sync at "
// << d_inputs0_index + ii << endl;
for (ii = 1; ii < d_inputs0_size; ii++){
if (atsc::tag_is_start_field_sync (input_tags[ii])){
// found one
d_locked = true;
const char *str;
if (atsc::tag_is_start_field_sync_1 (input_tags[ii]))
str = "FIELD-1";
else if (atsc::tag_is_start_field_sync_2 (input_tags[ii]))
str = "FIELD-2";
else
str = "SEGMENT";
cerr << "atsc_field_sync_demux: synced (" << str << ") at "
<< d_inputs0_index + ii
<< " [delta = " << d_inputs0_index + ii - d_lost_index
<< "]\n";
d_next_input += ii; // update for forecast
d_consume = ii;
return 0; // no work completed so far
}
}
// no non-NORMAL tag found
d_next_input += ii; // update for forecast
d_consume = ii;
// printf("ii: %d, d_next_input: %d\n",ii,d_next_input);
return 0; // no work completed so far
}
// We are in sync. Produce output...
int k = 0; // output index
while (k < noutput_items){
if (d_inputs0_size - ii < ATSC_DATA_SEGMENT_LENGTH){
// We're out of input data.
cerr << "atsc_field_sync_demux: ran out of input data\n";
d_next_input += ii; // update for forecast
return k; // return amount of work completed so far
}
if (!tag_is_seg_sync_or_field_sync (input_tags[ii])){
// lost sync...
cerr << "atsc_field_sync_demux: lost sync at "
<< d_inputs0_index + ii << endl;
d_next_input += ii; // update for forecast
return k; // return amount of work completed so far
}
if (atsc::tag_is_start_field_sync_1 (input_tags[ii])){
d_in_field2 = false;
d_segment_number = 0;
ii += ATSC_DATA_SEGMENT_LENGTH; // skip over field sync
continue;
}
if (atsc::tag_is_start_field_sync_2 (input_tags[ii])){
d_in_field2 = true;
d_segment_number = 0;
ii += ATSC_DATA_SEGMENT_LENGTH; // skip over field sync
continue;
}
if (d_segment_number >= ATSC_DSEGS_PER_FIELD){
// something's wrong...
cerr << "atsc_field_sync_demux: segment number overflow\n";
d_segment_number = 0;
}
out[k].pli.set_regular_seg (d_in_field2, d_segment_number++);
for (int jj = 0; jj < ATSC_DATA_SEGMENT_LENGTH; jj++)
out[k].data[jj] = in[ii + jj];
ii += ATSC_DATA_SEGMENT_LENGTH;
k++;
}
d_next_input += ii; // update for forecast
d_consume = ii;
return k; // return amount of work completed
}
|
