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/* -*- c++ -*- */
/*
* Copyright 2015 Free Software Foundation, Inc.
*
* This 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.
*
* This software 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 this software; 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_impl.h"
#include "gnuradio/dtv/atsc_consts.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace dtv {
static const int N_SAVED_SYMBOLS = 12;
atsc_field_sync_mux::sptr atsc_field_sync_mux::make()
{
return gnuradio::get_initial_sptr(new atsc_field_sync_mux_impl());
}
atsc_field_sync_mux_impl::atsc_field_sync_mux_impl()
: gr::block("atsc_field_sync_mux",
gr::io_signature::make(1, 1, sizeof(atsc_data_segment)),
gr::io_signature::make(1, 1, sizeof(atsc_data_segment)))
{
d_already_output_field_sync = false;
for (int i = 0; i < N_SAVED_SYMBOLS; i++) {
d_saved_symbols[i] = 0;
}
}
atsc_field_sync_mux_impl::~atsc_field_sync_mux_impl() {}
void atsc_field_sync_mux_impl::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 8VSB mode identifier
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 void atsc_field_sync_mux_impl::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 void atsc_field_sync_mux_impl::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);
}
void atsc_field_sync_mux_impl::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 bool atsc_field_sync_mux_impl::last_regular_seg_p(const plinfo& pli)
{
return pli.regular_seg_p() && (pli.segno() == ATSC_DSEGS_PER_FIELD - 1);
}
void atsc_field_sync_mux_impl::forecast(int noutput_items,
gr_vector_int& ninput_items_required)
{
ninput_items_required[0] = noutput_items;
}
int atsc_field_sync_mux_impl::general_work(int noutput_items,
gr_vector_int& ninput_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];
int in_length = ninput_items[0];
int index = 0;
int outdex = 0;
for (outdex = 0; outdex < noutput_items && index < in_length; 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;
field_sync.pli._flags = 0;
field_sync.pli._segno = 0;
memset(field_sync._pad_, 0, atsc_data_segment::NPAD);
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;
}
}
}
// Tell runtime system how many input items we consumed on
// each input stream.
consume_each(index);
// Tell runtime system how many output items we produced.
return outdex;
}
} /* namespace dtv */
} /* namespace gr */
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