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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 <gnuradio/io_signature.h>
#include "dvbt_reed_solomon_dec_impl.h"
#include <stdio.h>
namespace gr {
namespace dtv {
dvbt_reed_solomon_dec::sptr
dvbt_reed_solomon_dec::make(int p, int m, int gfpoly, int n, int k, int t, int s, int blocks)
{
return gnuradio::get_initial_sptr
(new dvbt_reed_solomon_dec_impl(p, m, gfpoly, n, k, t, s, blocks));
}
/*
* The private constructor
*/
dvbt_reed_solomon_dec_impl::dvbt_reed_solomon_dec_impl(int p, int m, int gfpoly, int n, int k, int t, int s, int blocks)
: block("dvbt_reed_solomon_dec",
io_signature::make(1, 1, sizeof(unsigned char) * blocks * (n - s)),
io_signature::make(1, 1, sizeof(unsigned char) * blocks * (k - s))),
d_p(p), d_m(m), d_gfpoly(gfpoly), d_n(n), d_k(k), d_t(t), d_s(s), d_blocks(blocks),
d_rs(p, m, gfpoly, n, k, t, s, blocks)
{
d_in = new unsigned char[d_n];
if (d_in == NULL) {
std::cout << "Cannot allocate memory for d_in" << std::endl;
exit(1);
}
memset(&d_in[0], 0, d_n);
}
/*
* Our virtual destructor.
*/
dvbt_reed_solomon_dec_impl::~dvbt_reed_solomon_dec_impl()
{
delete [] d_in;
}
void
dvbt_reed_solomon_dec_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
{
ninput_items_required[0] = noutput_items;
}
int
dvbt_reed_solomon_dec_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 unsigned char *in = (const unsigned char *) input_items[0];
unsigned char *out = (unsigned char *) output_items[0];
// We receive only nonzero data
int in_bsize = d_n - d_s;
int out_bsize = d_k - d_s;
for (int i = 0; i < (d_blocks * noutput_items); i++) {
//TODO - zero copy?
// Set first d_s symbols to zero
memset(&d_in[0], 0, d_s);
// Then copy actual data
memcpy(&d_in[d_s], &in[i * in_bsize], in_bsize);
d_rs.rs_decode(d_in, NULL, 0);
memcpy(&out[i * out_bsize], &d_in[d_s], out_bsize);
}
// Tell runtime system how many input items we consumed on
// each input stream.
consume_each (noutput_items);
// Tell runtime system how many output items we produced.
return noutput_items;
}
} /* namespace dtv */
} /* namespace gr */
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