Add dywapitchtracker

Improvements for PtAKF (finer resolution at end)
Bugfix for WavFile

PitchTracker/Helper.cpp

@@ -0,0 +1,43 @@
+#include "Helper.h"
+#include <stdlib.h>
+#include <cmath>
+
+float* short2FloatArray(short* in, size_t len){
+	const float maxShort = 32767.0;
+
+	float* result = static_cast<float*>(malloc(len * sizeof(float)));
+	float* curOut = result;
+	for(size_t i=0; i<len; i++){
+		*curOut = *in / maxShort;
+		curOut++;
+		in++;
+	}
+	return result;
+}
+
+double* short2DoubleArray(short* in, size_t len, bool scale){
+	const double maxShort = 32767.0;
+
+	double* result = static_cast<double*>(malloc(len * sizeof(double)));
+	double* curOut = result;
+	for(size_t i=0; i<len; i++){
+		*curOut = *in;
+		if(scale)
+			*curOut /= maxShort;
+		curOut++;
+		in++;
+	}
+	return result;
+}
+
+void freeFloatArray(float* floats){
+	free(floats);
+}
+
+void freeDoubleArray(double* floats){
+	free(floats);
+}
+
+double FreqToNote(double freq){
+	return 12.0 * std::log(freq / 127.09) / std::log(2.0) + 27.5 - 16; // 16 = C2
+}