51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
//
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// Created by david on 17.05.2026.
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//
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#ifndef PASADASUPERPROJECT_PD_RESAMP_H
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#define PASADASUPERPROJECT_PD_RESAMP_H
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#include "iir_filter.h"
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/** Filter that changes sampling rate between input and output. */
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class ResamplingFilter {
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public:
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ResamplingFilter() {}
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virtual ~ResamplingFilter() {}
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virtual void push(double ts, double val) = 0;
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virtual bool peek() = 0;
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virtual double get() = 0;
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};
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/** Normalizes incoming Android sensor sampling rate. */
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class Resampler : public ResamplingFilter {
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protected:
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const size_t INITIAL_SAMPLES = 100;
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std::vector<double> times;
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std::vector<double> data;
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/** circular buffer size */
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size_t N;
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/** write index */
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size_t n;
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/** read index */
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size_t m;
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bool initialized;
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bool read_valid;
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/** computed sampling frequency, this will be the output rate */
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double fs;
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void compute_fs();
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public:
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Resampler();
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/**
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* Push a value into the buffer.
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* Caller is responsible for polling via peek() and get() afterward.
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* @param ts timestamp in nanoseconds
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* @param val signal sample
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*/
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void push(double ts, double val) override;
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bool peek() override;
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double get() override;
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double get_fs() const;
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};
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#endif //PASADASUPERPROJECT_PD_RESAMP_H
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