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/* -*- c++ -*- */
/*
* Copyright 2004,2010,2012 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 "permutation_impl.h"
#include <gnuradio/io_signature.h>
#include <iostream>
#include <string.h>
namespace gr {
namespace trellis {
permutation::sptr permutation::make(int K,
const std::vector<int>& TABLE,
int SYMS_PER_BLOCK,
size_t BYTES_PER_SYMBOL)
{
return gnuradio::get_initial_sptr(
new permutation_impl(K, TABLE, SYMS_PER_BLOCK, BYTES_PER_SYMBOL));
}
permutation_impl::permutation_impl(int K,
const std::vector<int>& TABLE,
int SYMS_PER_BLOCK,
size_t BYTES_PER_SYMBOL)
: sync_block("permutation",
io_signature::make(1, -1, BYTES_PER_SYMBOL),
io_signature::make(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 * d_SYMS_PER_BLOCK);
// std::cout << d_K << "\n";
}
void permutation_impl::set_K(int K)
{
gr::thread::scoped_lock guard(d_setlock);
d_K = K;
set_output_multiple(d_K * d_SYMS_PER_BLOCK);
}
void permutation_impl::set_TABLE(const std::vector<int>& table)
{
gr::thread::scoped_lock guard(d_setlock);
d_TABLE = table;
}
void permutation_impl::set_SYMS_PER_BLOCK(int spb)
{
gr::thread::scoped_lock guard(d_setlock);
d_SYMS_PER_BLOCK = spb;
set_output_multiple(d_K * d_SYMS_PER_BLOCK);
}
permutation_impl::~permutation_impl() {}
int permutation_impl::work(int noutput_items,
gr_vector_const_void_star& input_items,
gr_vector_void_star& output_items)
{
gr::thread::scoped_lock guard(d_setlock);
int nstreams = input_items.size();
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.
// Beginning 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;
}
} /* namespace trellis */
} /* namespace gr */
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