--- /dev/null
+/* -*- 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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