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/* -*- c++ -*- */
/*
* Copyright 2015 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.
*/
#include <gnuradio/fec/ldpc_decoder.h>
#include <math.h>
#include <boost/assign/list_of.hpp>
#include <volk/volk.h>
#include <sstream>
#include <stdio.h>
#include <vector>
#include <gnuradio/fec/decoder.h>
#include <algorithm> // for std::reverse
#include <string.h> // for memcpy
#include <gnuradio/fec/maxstar.h>
namespace gr {
namespace fec {
generic_decoder::sptr
ldpc_decoder::make(std::string alist_file, float sigma, int max_iterations)
{
return generic_decoder::sptr(new ldpc_decoder(alist_file, sigma, max_iterations));
}
ldpc_decoder::ldpc_decoder (std::string alist_file, float sigma, int max_iterations)
: generic_decoder("ldpc_decoder")
{
if(!boost::filesystem::exists( alist_file ))
throw std::runtime_error("Bad AList file name!");
d_list.read(alist_file.c_str());
d_code.set_alist(d_list);
d_spa.set_alist_sigma(d_list, sigma);
inputSize = d_code.get_N();
outputSize = d_code.dimension();
d_spa.set_K(outputSize);
d_spa.set_max_iterations(max_iterations);
}
int ldpc_decoder::get_output_size() {
return outputSize;
}
int ldpc_decoder::get_input_size() {
return inputSize;
}
void ldpc_decoder::generic_work(void *inBuffer, void *outBuffer) {
const float *inPtr = (const float *) inBuffer;
unsigned char *out = (unsigned char *) outBuffer;
std::vector<float> rx(inputSize);
for(int i=0; i<inputSize; i++){ rx[i] = inPtr[i] * (-1); }
//memcpy(&rx[0], inPtr, inputSize*sizeof(float));
int n_iterations = 0;
std::vector<char> estimate( d_spa.decode(rx, &n_iterations) );
std::vector<char> data( d_code.get_systematic_bits(estimate) );
memcpy(out, &data[0], outputSize);
d_iterations = n_iterations;
}
int ldpc_decoder::get_input_item_size() {
return sizeof(INPUT_DATATYPE);
}
int ldpc_decoder::get_output_item_size() {
return sizeof(OUTPUT_DATATYPE);
}
int ldpc_decoder::get_history() {
return 0;
}
float ldpc_decoder::get_shift() {
return 0.0;
}
const char* ldpc_decoder::get_conversion() {
return "none";
}
ldpc_decoder::~ldpc_decoder() {
}
}
}
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