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/* -*- c++ -*- */
/*
* Copyright 2008,2010,2013,2017,2018 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 "moving_average_impl.h"
#include <gnuradio/io_signature.h>
namespace gr {
namespace blocks {
template <class T>
typename moving_average<T>::sptr
moving_average<T>::make(int length, T scale, int max_iter, unsigned int vlen)
{
return gnuradio::get_initial_sptr
(new moving_average_impl<T> (length, scale, max_iter, vlen));
}
template <class T>
moving_average_impl<T>::moving_average_impl(int length, T scale, int max_iter, unsigned int vlen)
: sync_block("moving_average",
io_signature::make(1, 1, sizeof(T)*vlen),
io_signature::make(1, 1, sizeof(T)*vlen)),
d_length(length),
d_scale(scale),
d_max_iter(max_iter),
d_vlen(vlen),
d_new_length(length),
d_new_scale(scale),
d_updated(false)
{
this->set_history(length);
//we don't have C++11's <array>, so initialize the stored vector instead
//we store this vector so that work() doesn't spend its time allocating and freeing vector storage
if(d_vlen > 1) {
d_sum = std::vector<T>(d_vlen);
}
}
template <class T>
moving_average_impl<T> ::~moving_average_impl()
{
}
template <class T>
void
moving_average_impl<T> ::set_length_and_scale(int length, T scale)
{
d_new_length = length;
d_new_scale = scale;
d_updated = true;
}
template <class T>
void
moving_average_impl<T> ::set_length(int length)
{
d_new_length = length;
d_updated = true;
}
template <class T>
void
moving_average_impl<T> ::set_scale(T scale)
{
d_new_scale = scale;
d_updated = true;
}
template <class T>
int
moving_average_impl<T> ::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
if(d_updated) {
d_length = d_new_length;
d_scale = d_new_scale;
this->set_history(d_length);
d_updated = false;
return 0; // history requirements might have changed
}
const T *in = (const T *)input_items[0];
T *out = (T *)output_items[0];
unsigned int num_iter = (unsigned int)((noutput_items>d_max_iter) ? d_max_iter : noutput_items);
if(d_vlen == 1) {
T sum = in[0];
for(int i = 1; i < d_length-1; i++) {
sum += in[i];
}
for(unsigned int i = 0; i < num_iter; i++) {
sum += in[i+d_length-1];
out[i] = sum * d_scale;
sum -= in[i];
}
} else { // d_vlen > 1
//gets automatically optimized well
for(unsigned int elem = 0; elem < d_vlen; elem++) {
d_sum[elem] = in[elem];
}
for(int i = 1; i < d_length - 1; i++) {
for(unsigned int elem = 0; elem < d_vlen; elem++) {
d_sum[elem] += in[i*d_vlen + elem];
}
}
for(unsigned int i = 0; i < num_iter; i++) {
for(unsigned int elem = 0; elem < d_vlen; elem++) {
d_sum[elem] += in[(i+d_length-1)*d_vlen + elem];
out[i*d_vlen + elem] = d_sum[elem] * d_scale;
d_sum[elem] -= in[i*d_vlen + elem];
}
}
}
return num_iter;
}
template class moving_average<std::int16_t>;
template class moving_average<std::int32_t>;
template class moving_average<float>;
template class moving_average<gr_complex>;
} /* namespace blocks */
} /* namespace gr */
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