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/* -*- c++ -*- */
/*
* Copyright 2014 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 "repetition_decoder_impl.h"
#include <math.h>
#include <boost/assign/list_of.hpp>
#include <volk/volk.h>
#include <sstream>
#include <stdio.h>
#include <vector>
namespace gr {
namespace fec {
namespace code {
generic_decoder::sptr
repetition_decoder::make(int frame_size, int rep,
float ap_prob)
{
return generic_decoder::sptr
(new repetition_decoder_impl(frame_size, rep,
ap_prob));
}
repetition_decoder_impl::repetition_decoder_impl(int frame_size, int rep,
float ap_prob)
: generic_decoder("repetition_decoder")
{
// Set max frame size here; all buffers and settings will be
// based on this value.
d_max_frame_size = frame_size;
set_frame_size(frame_size);
if(rep < 0)
throw std::runtime_error("repetition_encoder: repetition rate must be >= 0");
if((ap_prob < 0) || (ap_prob > 1.0))
throw std::runtime_error("repetition_encoder: a priori probability rate must be in [0, 1]");
d_rep = rep;
d_ap_prob = ap_prob;
d_trials.resize(d_rep);
}
repetition_decoder_impl::~repetition_decoder_impl()
{
}
int
repetition_decoder_impl::get_output_size()
{
//unpacked bits
return d_frame_size;
}
int
repetition_decoder_impl::get_input_size()
{
return d_frame_size*d_rep;
}
int
repetition_decoder_impl::get_input_item_size()
{
return sizeof(float);
}
const char*
repetition_decoder_impl::get_input_conversion()
{
return "none";
}
float
repetition_decoder_impl::get_shift()
{
return 0;
}
bool
repetition_decoder_impl::set_frame_size(unsigned int frame_size)
{
bool ret = true;
if(frame_size > d_max_frame_size) {
GR_LOG_INFO(d_logger, boost::format("tried to set frame to %1%; max possible is %2%") \
% frame_size % d_max_frame_size);
frame_size = d_max_frame_size;
ret = false;
}
d_frame_size = frame_size;
return ret;
}
double
repetition_decoder_impl::rate()
{
return 1.0/static_cast<double>(d_rep);
}
void
repetition_decoder_impl::generic_work(void *inbuffer, void *outbuffer)
{
const float *in = (const float*)inbuffer;
unsigned char *out = (unsigned char *) outbuffer;
for(unsigned int i = 0; i < d_frame_size; i++) {
for(unsigned int r = 0; r < d_rep; r++) {
d_trials[r] = (in[d_rep*i + r] > 0) ? 1.0f : 0.0f;
}
float res = std::count(d_trials.begin(), d_trials.end(), 1.0f);
if((res / static_cast<float>(d_rep)) > d_ap_prob)
out[i] = 1;
else
out[i] = 0;
}
}
} /* namespace code */
} /* namespace fec */
} /* namespace gr */
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