private static void Main()
{
// const string file = "music\\Afrojack - Unstoppable (Official Video).mp3";
const string file = @"C:\Users\Ale\Licenta-master\Licenta-master\PopulateDatabase\music\genres\blues\blues.00002.wav";
var watch = Stopwatch.StartNew();
var sound = SoundReader.ReadFromFile(file);
var ft = Fft.CalculateFft(sound);
watch.Stop();
var elapsedMs = watch.ElapsedMilliseconds;
Console.WriteLine($"Time: {elapsedMs} ms");
Console.ReadKey();
}
public static Fft CalculateFft(ISound sound, bool isFromServer = true, bool keepAll = false)
{
var res = new Fft {
Result = new List <DataPoint>()
};
if (isFromServer)
{
if (sound.NumChannels == 2)
{
ConvertStereoToMono(ref sound);
}
LowPassFilter(ref sound);
DownSampling(ref sound);
}
HammingWindowFunction(ref sound);
var list = sound.Data;
var chunkSize = 1024;
var sampledChunkSize = list.Count / chunkSize;
var result = new Complex[sampledChunkSize][];
for (var i = 0; i < sampledChunkSize; i++)
{
result[i] = new Complex[chunkSize];
for (var j = 0; j < chunkSize; j++)
{
result[i][j] = new Complex(list[i * chunkSize + j], 0);
}
result[i] = CalculateFft(result[i]);
}
var timeForChunk = sound.Duration / result.Length;
var mean = 0.0;
var pointsGlobal = Enumerable.Repeat(0, Range.Length + 1).ToList();
var highScoresGlobal = Enumerable.Repeat(0.0, Range.Length + 1).ToList();
for (var i = 0; i < result.Length; i++)
{
var points = Enumerable.Repeat(0, Range.Length + 1).ToList();
var highScores = Enumerable.Repeat(0.0, Range.Length + 1).ToList();
for (var freq = 0; freq < 512; freq++)
{
var mag = Math.Log(result[i][freq].Magnitude + 1);
var index = GetIndex(freq);
if (mag >= highScoresGlobal[index])
{
highScoresGlobal[index] = mag;
pointsGlobal[index] = freq;
}
if (!(mag >= highScores[index]))
{
continue;
}
points[index] = freq;
highScores[index] = mag;
}
// var filteredPoints = Filter(points, highScores);
mean += highScores.Sum();
res.Result.Add(new DataPoint
{
Hash = Hash(points),
Points = points,
Time = timeForChunk * i,
Duration = timeForChunk,
HighScores = !keepAll ? highScores : points.Select(x => (double)x).ToList()
});
}
if (!keepAll)
{
var avg = highScoresGlobal.Average();
for (var i = 0; i < res.Result.Count; i++)
{
var dataPoint = res.Result[i];
var aPoints = dataPoint.Points;
var aHighScores = dataPoint.HighScores;
Filter(ref aPoints, ref aHighScores, avg);
dataPoint.HighScores = dataPoint.Points.Select(x => (double)x).ToList();
dataPoint.Points = aPoints;
dataPoint.Hash = Hash(aPoints);
res.Result[i] = dataPoint;
}
}
return(res);
}