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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 "ldpc_encoder_impl.h"
#include <math.h>
#include <boost/assign/list_of.hpp>
#include <volk/volk.h>
#include <sstream>
#include <stdio.h>
#include <vector>
#include <algorithm> // for std::reverse
#include <string.h> // for memcpy
#include <gsl/gsl_matrix.h>
namespace gr {
namespace fec {
generic_encoder::sptr
ldpc_encoder::make(std::string alist_file, unsigned int gap)
{
code::ldpc_H_matrix::sptr H_obj = code::ldpc_H_matrix::make(alist_file, gap);
return make_H(H_obj);
}
generic_encoder::sptr
ldpc_encoder::make_H(const code::ldpc_H_matrix::sptr H_obj)
{
return generic_encoder::sptr
(new ldpc_encoder_impl(H_obj));
}
ldpc_encoder_impl::ldpc_encoder_impl(const code::ldpc_H_matrix::sptr H_obj)
: generic_encoder("ldpc_encoder")
{
// LDPC parity check matrix to use for encoding
d_H = H_obj;
d_rate = static_cast<double>(d_H->n())/static_cast<double>(d_H->k());
// Set frame size to k, the # of bits in the information word
// All buffers and settings will be based on this value.
set_frame_size(d_H->k());
}
ldpc_encoder_impl::~ldpc_encoder_impl()
{
}
int
ldpc_encoder_impl::get_output_size()
{
//return outputSize;
return d_output_size;
}
int
ldpc_encoder_impl::get_input_size()
{
//return inputSize;
return d_frame_size;
}
bool
ldpc_encoder_impl::set_frame_size(unsigned int frame_size)
{
bool ret = true;
if(frame_size % d_H->k() != 0) {
GR_LOG_ERROR(d_logger, boost::format("Frame size (%1% bits) must be a "
"multiple of the information word "
"size of the LDPC matrix (%2%).") \
% frame_size % (d_H->k()));
throw std::runtime_error("ldpc_encoder: cannot use frame size.");
}
d_frame_size = frame_size;
d_output_size = static_cast<int>(d_rate * d_frame_size);
return ret;
}
double
ldpc_encoder_impl::rate()
{
return d_rate;
}
void
ldpc_encoder_impl::generic_work(void *inbuffer, void *outbuffer)
{
// Populate the information word
const unsigned char *in = (const unsigned char *)inbuffer;
unsigned char *out = (unsigned char*)outbuffer;
int j = 0;
for(int i = 0; i < get_input_size(); i+=d_H->k()) {
d_H->encode(&out[j], &in[i]);
j += d_H->n();
}
}
}
}
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