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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_convolutional_interleaver_impl.h"
#include <deque>
namespace gr {
namespace dtv {
dvbt_convolutional_interleaver::sptr
dvbt_convolutional_interleaver::make(int nsize, int I, int M)
{
return gnuradio::get_initial_sptr
(new dvbt_convolutional_interleaver_impl(nsize, I, M));
}
/*
* The private constructor
*/
dvbt_convolutional_interleaver_impl::dvbt_convolutional_interleaver_impl(int blocks, int I, int M)
: sync_interpolator("dvbt_convolutional_interleaver",
io_signature::make(1, 1, sizeof (unsigned char) * I * blocks),
io_signature::make(1, 1, sizeof (unsigned char)), I * blocks),
d_I(I), d_M(M)
{
//Positions are shift registers (FIFOs)
//of length i*M
for (int i = 0; i < d_I; i++) {
d_shift.push_back(new std::deque<unsigned char>(d_M * i, 0));
}
}
/*
* Our virtual destructor.
*/
dvbt_convolutional_interleaver_impl::~dvbt_convolutional_interleaver_impl()
{
for (unsigned int i = 0; i < d_shift.size(); i++) {
delete d_shift.back();
d_shift.pop_back();
}
}
int
dvbt_convolutional_interleaver_impl::work (int noutput_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];
for (int i = 0; i < (noutput_items / d_I); i++) {
//Process one block of I symbols
for (unsigned int j = 0; j < d_shift.size(); j++) {
d_shift[j]->push_front(in[(d_I * i) + j]);
out[(d_I * i) + j] = d_shift[j]->back();
d_shift[j]->pop_back();
}
}
// Tell runtime system how many output items we produced.
return noutput_items;
}
} /* namespace dtv */
} /* namespace gr */
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