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/* -*- c++ -*- */
/*
* Copyright 2005,2010,2013 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 "rms_ff_impl.h"
#include <gr_io_signature.h>
#include <cmath>
namespace gr {
namespace blocks {
rms_ff::sptr
rms_ff::make(double alpha)
{
return gnuradio::get_initial_sptr
(new rms_ff_impl(alpha));
}
rms_ff_impl::rms_ff_impl(double alpha)
: gr_sync_block("rms_ff",
gr_make_io_signature(1, 1, sizeof(float)),
gr_make_io_signature(1, 1, sizeof(float))),
d_iir(alpha)
{
}
rms_ff_impl::~rms_ff_impl()
{
}
void
rms_ff_impl::set_alpha(double alpha)
{
d_iir.set_taps(alpha);
}
int
rms_ff_impl::work(int noutput_items,
gr_vector_const_void_star &input_items,
gr_vector_void_star &output_items)
{
const float *in = (const float *)input_items[0];
float *out = (float *)output_items[0];
for(int i = 0; i < noutput_items; i++) {
double mag_sqrd = in[i]*in[i];
double f = d_iir.filter(mag_sqrd);
out[i] = sqrt(f);
}
return noutput_items;
}
} /* namespace blocks */
} /* namespace gr */
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