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/* -*- c++ -*- */
/*
* Copyright 2002 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.
*/
#include <cmath>
#include <GrAtscFieldSyncDemux.h>
#include <atsc_consts.h>
#include <atsc_types.h>
#include <atsci_syminfo.h>
#include <stdio.h>
#include <assert.h>
using std::abs;
static const int DEC = ATSC_DATA_SEGMENT_LENGTH; // nominal decimation factor
GrAtscFieldSyncDemux::GrAtscFieldSyncDemux ()
: VrDecimatingSigProc<float,atsc_soft_data_segment> (1, DEC),
d_locked (false), d_in_field2(true), d_segment_number(0), d_next_input(0),
d_lost_index (0)
{
history = 2 * ATSC_DATA_SEGMENT_LENGTH; // spare input samples in case we need them.
}
GrAtscFieldSyncDemux::~GrAtscFieldSyncDemux ()
{
}
int
GrAtscFieldSyncDemux::forecast (VrSampleRange output,
VrSampleRange inputs[]) {
/* dec:1 ratio with history */
assert (numberInputs == 2);
for (unsigned int i = 0; i < numberInputs; i++) {
inputs[i].index = d_next_input;
inputs[i].size = output.size * decimation + history - 1;
}
return 0;
}
inline static bool
tag_is_seg_sync_or_field_sync (atsc::syminfo tag)
{
return tag.symbol_num == 0 && tag.valid;
}
int
GrAtscFieldSyncDemux::work (VrSampleRange output, void *ao[],
VrSampleRange inputs[], void *ai[])
{
float *input_samples = (float *) ai[0];
atsc::syminfo *input_tags = (atsc::syminfo *) ai[1];
atsc_soft_data_segment *out = ((atsc_soft_data_segment **)ao)[0];
sync (output.index);
unsigned 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 = inputs[0].index + ii;
cerr << "GrAtscFieldSyncDemux: lost sync at "
<< d_lost_index << endl;
}
// ... search for beginning of a field sync
// cerr << "GrAtscFieldSyncDemux: searching for sync at "
// << inputs[0].index + ii << endl;
for (ii = 1; ii < inputs[0].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 << "GrAtscFieldSyncDemux: synced (" << str << ") at "
<< inputs[0].index + ii
<< " [delta = " << inputs[0].index + ii - d_lost_index
<< "]\n";
d_next_input += ii; // update for forecast
return 0; // no work completed so far
}
}
// no non-NORMAL tag found
d_next_input += ii; // update for forecast
return 0; // no work completed so far
}
// We are in sync. Produce output...
unsigned int k = 0; // output index
while (k < output.size){
if (inputs[0].size - ii < (unsigned) ATSC_DATA_SEGMENT_LENGTH){
// We're out of input data.
cerr << "GrAtscFieldSyncDemux: 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 << "GrAtscFieldSyncDemux: lost sync at "
// << inputs[0].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 << "GrAtscFieldSyncDemux: 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] = input_samples[ii + jj];
ii += ATSC_DATA_SEGMENT_LENGTH;
k++;
}
d_next_input += ii; // update for forecast
return k; // return amount of work completed
}
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