public (bool succes, double value) CalculateFrequency(List <SoundPoint> values, int step, int start, int k, int size, float precision,
int dimensions, bool useMedian, bool useRandomValues)
{
if (dimensions * k + start > values.Count)
{
return(false, double.NegativeInfinity);
}
if (dimensions * k + start > start + size)
{
return(false, double.NegativeInfinity);
}
if (start + size > values.Count)
{
return(false, double.NegativeInfinity);
}
var valuesToTest = new List <List <SoundPoint> >();
for (var i = dimensions * k + start; i < start + size; i += step)
{
var temp = new List <SoundPoint>();
for (var j = 0; j < dimensions; j++)
{
temp.Add(values[i - j * k]);
}
valuesToTest.Add(temp);
}
var comparer = new SoundPointComparer(precision);
var distances = new List <long>();
var indexForDistance = 0;
for (var i = 0; i < 20; i++)
{
var index = useRandomValues ? _random.Next(0, Math.Min(100, valuesToTest.Count)) : indexForDistance;
var distance = GetDistance(valuesToTest, index, comparer);
if (distance.success)
{
distances.Add(distance.value);
}
indexForDistance += 5;
}
if (distances.Count == 0)
{
return(false, double.PositiveInfinity);
}
var calculated = useMedian ? GetMedian(distances) : distances.Average();
return(true, 1d / calculated * SampleRate);
}
private (bool success, long value) GetDistance(List <List <SoundPoint> > values, int startIndex,
SoundPointComparer comparer)
{
if (startIndex >= values.Count)
{
return(false, long.MaxValue);
}
var first = values[startIndex];
startIndex += 30;
for (; startIndex < values.Count; startIndex++)
{
if (first.SequenceEqual(values[startIndex], comparer))
{
break;
}
}
if (startIndex >= values.Count)
{
return(false, long.MaxValue);
}
return(true, values[startIndex][0].Time - first[0].Time);
}