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/* -*- c++ -*- */
/*
* Copyright 2004,2010 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 3, 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 <trellis_permutation.h>
#include <gr_io_signature.h>
#include <iostream>
#include <string.h>
trellis_permutation_sptr
trellis_make_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t BYTES_PER_SYMBOL)
{
return gnuradio::get_initial_sptr(new trellis_permutation (K,TABLE,SYMS_PER_BLOCK,BYTES_PER_SYMBOL));
}
trellis_permutation::trellis_permutation (int K, const std::vector<int> &TABLE, int SYMS_PER_BLOCK, size_t BYTES_PER_SYMBOL)
: gr_sync_block ("permutation",
gr_make_io_signature (1, -1, BYTES_PER_SYMBOL),
gr_make_io_signature (1, -1, BYTES_PER_SYMBOL)),
d_K (K),
d_TABLE (TABLE),
d_SYMS_PER_BLOCK (SYMS_PER_BLOCK),
d_BYTES_PER_SYMBOL (BYTES_PER_SYMBOL)
{
set_output_multiple (d_K*SYMS_PER_BLOCK);
//std::cout << d_K << "\n";
}
int
trellis_permutation::work (int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
int nstreams = input_items.size();
assert (input_items.size() == output_items.size());
assert (noutput_items % d_K ==0);
for (int m=0;m<nstreams;m++) {
const char *in = (const char *) input_items[m];
char *out = (char *) output_items[m];
// per stream processing
for (int i = 0; i < noutput_items/d_SYMS_PER_BLOCK; i++){
// Index i refers to blocks.
// Begining of packet (in blocks)
int i0 = d_K*(i/d_K);
// position of block within packet (in blocks)
int j0 = i%d_K;
// new position of block within packet (in blocks)
int k0 = d_TABLE[j0];
memcpy(&(out[i*d_SYMS_PER_BLOCK*d_BYTES_PER_SYMBOL]),
&(in[(i0+k0)*d_SYMS_PER_BLOCK*d_BYTES_PER_SYMBOL]),
d_BYTES_PER_SYMBOL*d_SYMS_PER_BLOCK);
}
// end per stream processing
}
return noutput_items;
}
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