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sdrangel/sdrbase/util/movingaverage.h

60 lines
2.6 KiB
C++

///////////////////////////////////////////////////////////////////////////////////////
// SDRdaemon - send I/Q samples read from a SDR device over the network via UDP //
// with FEC protection. GNUradio interface. //
// //
// http://stackoverflow.com/questions/10990618/calculate-rolling-moving-average-in-c //
// //
// Copyright (C) 2016 Edouard Griffiths, F4EXB //
// //
// This program 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 as version 3 of the License, or //
// //
// This program 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////////
#ifndef _UTIL_MOVINGAVERAGE_H_
#define _UTIL_MOVINGAVERAGE_H_
#include <algorithm>
template <typename T, typename Total, int N>
class MovingAverage
{
public:
MovingAverage()
: m_num_samples(0), m_total(0)
{ }
void operator()(T sample)
{
if (m_num_samples < N)
{
m_samples[m_num_samples++] = sample;
m_total += sample;
}
else
{
T& oldest = m_samples[m_num_samples++ % N];
m_total += sample - oldest;
oldest = sample;
}
}
operator double() const { return m_num_samples > 0 ? m_total / std::min(m_num_samples, N) : 0.0d; }
operator float() const { return m_num_samples > 0 ? m_total / std::min(m_num_samples, N) : 0.0f; }
private:
T m_samples[N];
int m_num_samples;
Total m_total;
};
#endif /* GR_SDRDAEMONFEC_LIB_MOVINGAVERAGE_H_ */