movingaverage.h

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#ifndef INCLUDE_MOVINGAVERAGE_H
#define INCLUDE_MOVINGAVERAGE_H

#include <stdint.h>
#include <vector>
#include <algorithm>
#include "dsp/dsptypes.h"

template<typename Type> class MovingAverage {
public:
    MovingAverage(int historySize, Type initial) : m_index(0)
    {
        resize(historySize, initial);
    }

    void resize(int historySize, Type initial)
    {
        m_history.resize(historySize);
        std::fill(m_history.begin(), m_history.end(), initial);
        m_sum = (Type) m_history.size() * initial;
        m_index = 0;
    }

    void feed(Type value)
    {
        Type& oldest = m_history[m_index];
        m_sum += value - oldest;
        oldest = value;

        if (m_index < m_history.size() - 1) {
            m_index++;
        } else {
            m_index = 0;
        }
    }

    void fill(Type value)
    {
        std::fill(m_history.begin(), m_history.end(), value);
        m_sum = (Type) m_history.size() * value;
    }

    Type average() const
    {
        return m_sum / (Type) m_history.size();
    }

    Type sum() const
    {
        return m_sum;
    }

    int historySize() const
    {
        return m_history.size();
    }

protected:
    std::vector<Type> m_history;
    Type m_sum;
    uint32_t m_index;
};

#endif // INCLUDE_MOVINGAVERAGE_H