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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_interleaver_impl.h"
#include "gnuradio/dtv/atsc_consts.h"
#include <stdio.h>
namespace gr {
namespace dtv {
atsc_interleaver::sptr
atsc_interleaver::make()
{
return gnuradio::get_initial_sptr
(new atsc_interleaver_impl());
}
atsc_interleaver_impl::atsc_interleaver_impl()
: gr::sync_block("atsc_interleaver",
gr::io_signature::make(1, 1, sizeof(atsc_mpeg_packet_rs_encoded)),
gr::io_signature::make(1, 1, sizeof(atsc_mpeg_packet_rs_encoded)))
{
I = 52; /* ATSC interleaver */
J = 4;
registers = (unsigned char *) malloc(sizeof(unsigned char) * I * ((I - 1) * J));
if (registers == NULL) {
fprintf(stderr, "Out of memory.\n");
exit(1);
}
pointers = (int *) malloc(sizeof(int) * I);
if (pointers == NULL) {
fprintf(stderr, "Out of memory.\n");
exit(1);
}
memset(registers, 0, sizeof(unsigned char) * I * ((I - 1) * J));
memset(pointers, 0, sizeof(int) * I);
commutator = 0;
}
atsc_interleaver_impl::~atsc_interleaver_impl()
{
free(pointers);
free(registers);
}
int
atsc_interleaver_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const atsc_mpeg_packet_rs_encoded *in = (const atsc_mpeg_packet_rs_encoded *) input_items[0];
atsc_mpeg_packet_rs_encoded *out = (atsc_mpeg_packet_rs_encoded *) output_items[0];
int p, n = ATSC_MPEG_RS_ENCODED_LENGTH;
for (int i = 0; i < noutput_items; i++) {
assert(in[i].pli.regular_seg_p());
plinfo::sanity_check(in[i].pli);
out[i].pli = in[i].pli; // copy pipeline info
if (in[i].pli.first_regular_seg_p()) { // reset commutator if required
commutator = 0;
}
for (int j = 0; j < n; j++) {
if (commutator == 0) {
out[i].data[j] = in[i].data[j];
}
else {
p = pointers[commutator];
out[i].data[j] = registers[commutator * (I - 1) * J + p];
registers[commutator * (I - 1) * J + p] = in[i].data[j];
pointers[commutator] = (p + 1) % (commutator * J);
}
commutator = (commutator + 1) % I;
}
}
// Tell runtime system how many output items we produced.
return noutput_items;
}
} /* namespace dtv */
} /* namespace gr */
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