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

---
 autocorrelation.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 autocorrelation.cpp

(limited to 'autocorrelation.cpp')

diff --git a/autocorrelation.cpp b/autocorrelation.cpp
new file mode 100644
index 0000000..5c778c1
--- /dev/null
+++ b/autocorrelation.cpp
@@ -0,0 +1,29 @@
+#include "autocorrelation.h"
+
+#include "fft.h"
+
+struct RIT::AutoCorrelation::Impl {
+public:
+	Impl(int size): mFft(std::make_shared<RIT::FFT>(size)), mIfft(mFft) {}
+	std::shared_ptr<RIT::FFT> mFft;
+	RIT::IFFT mIfft;
+};
+
+RIT::AutoCorrelation::AutoCorrelation(int size): mImpl(std::make_unique<RIT::AutoCorrelation::Impl>(size))
+{
+}
+
+RIT::AutoCorrelation::~AutoCorrelation()
+{
+}
+
+std::vector<std::complex<double>> RIT::AutoCorrelation::operator()(const std::vector<std::complex<double>> &v) const
+{
+	auto result = (*mImpl->mFft)(v);
+
+	std::transform(std::begin(result), std::end(result), std::begin(result),
+		       [=](const auto& x){return x * std::conj(x);});
+	
+	return mImpl->mIfft(result);
+}
+
-- 
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