--- /dev/null
+/* -*- 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 <atsc_field_sync_mux.h>
+#include <gr_io_signature.h>
+#include <atsc_consts.h>
+#include <atsci_pnXXX.h>
+
+
+atsc_field_sync_mux_sptr
+atsc_make_field_sync_mux()
+{
+ return atsc_field_sync_mux_sptr(new atsc_field_sync_mux());
+}
+
+atsc_field_sync_mux::atsc_field_sync_mux()
+ : gr_sync_block("atsc_field_sync_mux",
+ gr_make_io_signature(1, 1, sizeof(atsc_data_segment)),
+ gr_make_io_signature(1, 1, sizeof(atsc_data_segment)))
+{
+ reset();
+}
+
+static const int NUMBER_OF_OUTPUTS = 1; // # of output streams (almost always one)
+
+static const int N_SAVED_SYMBOLS = atsc_field_sync_mux::N_SAVED_SYMBOLS;
+
+static void
+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 VSB8 mode identifiera
+ 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 static void
+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 static void
+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);
+}
+
+static void
+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 static bool
+last_regular_seg_p (const plinfo &pli)
+{
+ return pli.regular_seg_p () && (pli.segno () == ATSC_DSEGS_PER_FIELD - 1);
+}
+
+void
+atsc_field_sync_mux::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] = fixed_rate_noutput_to_ninput (noutput_items);
+
+}
+
+
+int
+atsc_field_sync_mux::work (int noutput_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];
+
+ unsigned int index = 0;
+ for (int outdex = 0; outdex < noutput_items; 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;
+
+ 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;
+ }
+ }
+ }
+
+ d_current_index += index;
+
+ return noutput_items;
+}
projects / debian / gnuradio / blobdiff