From fef594c82518a8fe4c96794852c1fc849c0ed3b3 Mon Sep 17 00:00:00 2001
From: Roland Stigge <stigge@antcom.de>
Date: Sun, 17 Feb 2019 12:55:13 +0100
Subject: Added tunerdemo

---
 main.cpp | 270 ---------------------------------------------------------------
 1 file changed, 270 deletions(-)
 delete mode 100644 main.cpp

(limited to 'main.cpp')

diff --git a/main.cpp b/main.cpp
deleted file mode 100644
index 3945cff..0000000
--- a/main.cpp
+++ /dev/null
@@ -1,270 +0,0 @@
-// FFT Test
-
-#include "fft.h"
-
-#include <complex>
-#include <chrono>
-#include <cmath>
-#include <ctime>
-#include <exception>
-#include <functional>
-#include <iostream>
-#include <memory>
-#include <numeric>
-#include <string>
-#include <vector>
-
-const std::complex<double> i(0, 1);
-
-const double tolerance = 0.000001;
-
-using namespace std::complex_literals;
-
-/// CPU time clock
-class Timer {
-public:
-	Timer(): mStart(std::clock()){}
-	void start(){mStart = std::clock();}
-	double elapsed() { return (double(std::clock()) - mStart) / CLOCKS_PER_SEC; }
-	static double precision() {
-		static double result{0};
-		
-		if (result != 0)
-			return result;
-		
-		std::clock_t start = std::clock();
-		while (start == std::clock()) {}
-		start = std::clock();
-
-		std::clock_t end = start;
-		while (end == std::clock()) {}
-		end = std::clock();
-
-		result = (double(end) - start) / CLOCKS_PER_SEC;
-		return result;
-	}
-private:
-	std::clock_t mStart;
-};
-
-// (Slow) DFT
-std::vector<std::complex<double>> dft(const std::vector<std::complex<double>> &v) {
-	std::vector<std::complex<double>> result(v.size(), 0);
-
-	const double N = v.size();
-
-	for (int k = 0; k < v.size(); k++) {
-		for (int j = 0; j < result.size(); j++) {
-			result[k] += v[j] * std::exp(-i * 2. * M_PI * double(k * j) / N);
-		}
-	}
-
-	return result;
-}
-
-std::vector<double> freqs{ 2, 5, 11, 17, 29 }; // known freqs for testing
-
-void generate(std::vector<std::complex<double>>& v) {
-    for (int i = 0; i < v.size(); i++) {
-        v[i] = 0.;
-        // sum several known sinusoids into v[]
-        for(int j = 0; j < freqs.size(); j++)
-            v[i] += sin(2 * M_PI * freqs[j] * i / v.size() );
-    }
-}
-
-namespace CooleyTukey {
-
-// separate even/odd elements to lower/upper halves of array respectively.
-// Due to Butterfly combinations, this turns out to be the simplest way 
-// to get the job done without clobbering the wrong elements.
-void separate(std::vector<std::complex<double>>::iterator a, int n) {
-	std::vector<std::complex<double>> b(n/2);
-	for(int i=0; i<n/2; i++)    // copy all odd elements to heap storage
-		b[i] = a[i*2+1];
-	for(int i=0; i<n/2; i++)    // copy all even elements to lower-half of a[]
-		a[i] = a[i*2];
-	for(int i=0; i<n/2; i++)    // copy all odd (from heap) to upper-half of a[]
-		a[i+n/2] = b[i];
-}
-
-// N must be a power-of-2, or bad things will happen.
-// Currently no check for this condition.
-//
-// N input samples in X[] are FFT'd and results left in X[].
-// Because of Nyquist theorem, N samples means 
-// only first N/2 FFT results in X[] are the answer.
-// (upper half of X[] is a reflection with no new information).
-void fft_recursive(std::vector<std::complex<double>>::iterator X, int N) {
-    if(N < 2) {
-        // bottom of recursion.
-        // Do nothing here, because already X[0] = x[0]
-    } else {
-        separate(X,N);      // all evens to lower half, all odds to upper half
-        fft_recursive(X,     N/2);   // recurse even items
-        fft_recursive(X+N/2, N/2);   // recurse odd  items
-        // combine results of two half recursions
-        for(int k=0; k<N/2; k++) {
-            std::complex<double> e = X[k    ];   // even
-            std::complex<double> o = X[k+N/2];   // odd
-                         // w is the "twiddle-factor"
-            std::complex<double> w = exp( std::complex<double>(0,-2.*M_PI*k/N) );
-            X[k    ] = e + w * o;
-            X[k+N/2] = e - w * o;
-        }
-    }
-}
-
-// Cooley-Tukey
-std::vector<std::complex<double>> fft(const std::vector<std::complex<double>> &v) {
-	std::vector<std::complex<double>> result(v);
-
-	fft_recursive(std::begin(result), result.size());
-	
-	return result;
-}
-}; // namespace CooleyTukey
-
-class Measure {
-	Timer mTimer;
-
-public:
-	using Data = std::vector<std::complex<double>>;
-	
-protected:
-	Measure* mReference; // Reference measurement: we should calculate similar to this one and be faster than this one
-	
-	const Data& mIn;
-	Data mResult;
-
-	std::string mName;
-	double mElapsed;
-
-public:
-	Measure(const Data& in): mReference(nullptr), mIn(in), mResult(in.size()) {}
-
-	virtual void run_impl() = 0; // implemented by subclasses
-
-	void run() {
-		mTimer.start();
-		run_impl();
-		mElapsed = mTimer.elapsed();
-		std::cout << mName << ": " << mElapsed << "s\n";
-
-		if (mReference) {
-			if (mResult != mReference->mResult) {
-				double diff = std::transform_reduce(std::begin(mResult), std::end(mResult), std::begin(mReference->mResult), double(0.0),
-								    [](const double& x, const double& y) -> double
-								    { return x + y;},
-								    [](const std::complex<double>& x, const std::complex<double>&y) -> double
-								    { return abs(y - x);}
-								    );
-				if (diff > tolerance)
-					std::cout << "Error: Results diff: " << diff << "\n";
-			}
-
-			if (mElapsed > mReference->mElapsed) {
-				std::cout << "Error: " << mName << " too slow!\n";
-			}
-		}
-	}
-
-	double elapsed() { return mElapsed; }
-
-	Data& result() { return mResult; }
-};
-
-class MeasureDFT: public Measure {
-public:
-	MeasureDFT(const Data& in): Measure(in){ mName = "DFT";}
-	void run_impl() override {
-		mResult = dft(mIn);
-	}
-};
-
-class MeasureFFT: public Measure {
-public:
-	MeasureFFT(const Data& in, Measure& reference): Measure(in) { mName = "FFT Cooley-Tukey"; mReference = &reference;}
-	void run_impl() override {
-		mResult = CooleyTukey::fft(mIn);
-	}
-};
-
-class MeasureFFT_RR: public Measure {
-	RIT::FFT mRR;
-public:
-	MeasureFFT_RR(const Data& in, Measure& reference): Measure(in), mRR(in.size()){ mName = "FFT RR"; mReference = &reference;}
-	void run_impl() override {
-		mResult = mRR(mIn);
-	}
-};
-
-class MeasureFFT_RR_half: public Measure {
-	RIT::FFT mRR;
-public:
-	MeasureFFT_RR_half(const Data& in, Measure& reference): Measure(in), mRR(in.size(), true){ mName = "FFT RR half"; mReference = &reference; }
-	void run_impl() override {
-		mResult = mRR(mIn);
-	}
-};
-
-class MeasureFFT_RR_half_magnitudes: public Measure {
-	RIT::FFT mRR;
-public:
-	MeasureFFT_RR_half_magnitudes(const Data& in, Measure& reference): Measure(in), mRR(in.size(), true){ mName = "FFT RR half magnitudes"; mReference = &reference; }
-	void run_impl() override {
-		mResult = mRR(mIn);
-		RIT::magnitudes(mResult);
-	}
-};
-
-class MeasureIFFT_RR: public Measure {
-	RIT::IFFT mIFFT;
-public:
-	MeasureIFFT_RR(const Data& in): Measure(in), mIFFT(in.size()) { mName = "IFFT RR";}
-	void run_impl() override {
-		mResult = mIFFT(mIn);
-	}
-};
-
-class MeasureAutoCorrelation_RR: public Measure {
-	RIT::AutoCorrelation mAC;
-public:
-	MeasureAutoCorrelation_RR(const Data& in): Measure(in), mAC(in.size()) { mName = "AutoCorrelation RR";}
-	void run_impl() override {
-		mResult = mAC(mIn);
-	}
-};
-
-int main(int argc, char* argv[]) {
-	std::vector<std::complex<double>> v(4096, 0);
-
-	generate(v);
-
-	std::cout << "Timer precision: " << Timer::precision() << "s\n";
-
-	MeasureDFT measureDFT(v);
-	measureDFT.run();
-
-	MeasureFFT measureFFT(v, measureDFT);
-	measureFFT.run();
-
-	MeasureFFT_RR measureFFT_RR(v, measureFFT);
-	measureFFT_RR.run();
-
-	MeasureFFT_RR_half measureFFT_RR_half(v, measureFFT_RR);
-	measureFFT_RR_half.run();
-	
-	MeasureFFT_RR_half_magnitudes measureFFT_RR_half_magnitudes(v, measureDFT);
-	measureFFT_RR_half_magnitudes.run();
-
-	MeasureIFFT_RR measureIFFT_RR(v);
-	measureIFFT_RR.run();
-	
-	MeasureAutoCorrelation_RR measureAutoCorrelation_RR(v);
-	measureAutoCorrelation_RR.run();
-	
-	return 0;
-}
-
-
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