Cepstral Pitch Tracker

    class Hypothesis {

    public:

        struct Estimate {

            double freq;

            Vamp::RealTime time;

        };

        typedef std::vector<Estimate> Estimates;

        Hypothesis(Estimate s);

        ~Hypothesis();

        enum State {

            Provisional,

            Satisfied,

            Rejected,

            Expired

        };

        bool test(Estimate);

        State getState();

        Estimates getAcceptedEstimates();

    private:

        bool isWithinTolerance(Estimate);

        bool isSatisfied();

        State m_state;

        Estimates m_pending;

        int m_age;

    };

    typedef std::vector<Hypothesis> Hypotheses;

    Hypotheses m_possible;

    Hypothesis *m_accepted;