Add basic pitch tracking #3

src/voyx/alg/NaivePitchTracking.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <voyx/Header.h>
+#include <voyx/etc/Convert.h>
+
+class NaivePitchTracking
+{
+
+public:
+
+  NaivePitchTracking(const voyx_t concertpitch) :
+    concertpitch(concertpitch)
+  {
+  }
+
+  voyx_t operator()(const voyx_t f0) const
+  {
+    const voyx_t key = std::round($$::midi::key(f0, concertpitch));
+    const voyx_t freq = $$::midi::freq(key, concertpitch);
+
+    return freq;
+  }
+
+private:
+
+  const voyx_t concertpitch;
+
+};