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/* -*- 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 2, 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 (unsigned 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;
}
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