//Returns the promonate frequences every second of the song.
public static List <float> SignalChain(string filename)
{
AudioFileReader source = new AudioFileReader(filename);
List <float> chain = new List <float>();
float[] data = new float[1024];
float[] HistoryBuffer = new float[43]; //One second of audio(energy)
int read;
int historyCount = 0;
StereotoMonoSampleProvider mono = new StereotoMonoSampleProvider(source);
while ((read = mono.Read(data, 0, data.Length)) > 0)
{
chain.Add(FastFourierTransform.PopularFreq(data));
}
return(chain);
}
public List <float> MusicProcesser(string filename, int toneDown = 1)
{
List <float> tempo = new List <float>();
const float INSTANCETIME = 0.023256f;
BeatTimeStamps.Clear();
Signals.Clear();
AudioFileReader pcm = new AudioFileReader(filename);
MusicReader.DisplayInfo(pcm);
Energize e = new Energize();
List <float> bpms = new List <float>();
int oneMin = 0;
float[] input = new float[2048];
Queue <float> HistoryBuffer = new Queue <float>();
//float[] HistoryBuffer = new float[43];
float[] left = new float[input.Length / 2];
float[] right = new float[input.Length / 2];
float[] mono = new float[input.Length / 2];
int read;
int leftCount = 0;
int rightCount = 0;
float InstanceEnergy = 0;
float sampLocalEnergy = 0;
float C = 0;
float timeDetected = 0.0f;
BeatSampleProvider samp = new BeatSampleProvider(pcm);
int beatTriggers = 0;
int beatThreshold = 2;
while ((read = samp.Read(input, 0, input.Length)) > 0)
{
leftCount = 0;
rightCount = 0;
for (int i = 0; i < input.Length - 1; i++)
{
if (i % 2 == 0)
{
left[leftCount] = input[i];
leftCount++;
}
else
{
right[rightCount] = input[i];
rightCount++;
}
}
for (int n = 0; n < mono.Length; n++)
{
mono[n] = (left[n] * .5f) + (right[n] * .5f);
}
InstanceEnergy = e.MonoInstanceEnergy(input);
SampleCount++;
HistoryBuffer.Enqueue(InstanceEnergy);
timeDetected += INSTANCETIME;
if (SampleCount == 43)
{
oneMin++;
SampleCount = 0;
}
if (oneMin == 60)
{
bpms.Add(BPM);
BPM = 0;
oneMin = 0;
}
if (HistoryBuffer.Count > 43)
{
HistoryBuffer.Dequeue();
sampLocalEnergy = e.LocalEnergy(HistoryBuffer.ToArray());
// float variance = e.Varaince(HistoryBuffer.ToArray(), sampleSize);
if (InstanceEnergy > (e.C(0) * sampLocalEnergy))
{
if (++beatTriggers == beatThreshold)
{
BeatTimeStamps.Add(timeDetected);
Signals.Add(FastFourierTransform.PopularFreq(mono));
BPM++;
}
}
else
{
beatTriggers = 0;
}
}
}
return(bpms);
}
//public static void FreqBPM(String filename)
//{
// AudioFileReader data = new AudioFileReader(filename);
// DisplayInfo(data);
// FastFourierTransform fft = new FastFourierTransform();
// float[] input = new float[2048];
// float[] HistoryBuffer = new float[43]; //One second of audio(energy)
// float[] left = new float[input.Length / 2];
// float[] right = new float[input.Length / 2];
// float[] subband;
// Complex[] comp = new Complex[left.Length];
// int HistoryBufferCount = 0;
// int readCheck;
// int SampleCount = 0;
// int BPM = 0;
// BeatSampleProvider samp = new BeatSampleProvider(data);
// while((readCheck = samp.Read(input,0,input.Length)) > 0)
// {
// int leftCount = 0;
// int rightCount = 0;
// for (int i = 0; i < input.Length; i++)
// {
// if ((i % 2) == 0)
// {
// left[leftCount] = input[i];
// leftCount++;
// }
// else
// {
// right[rightCount] = input[i];
// rightCount++;
// }
// }
// float[] complexNumbers = new float[1024];
// for (int i = 0; i < comp.Length; i++)
// {
// comp[i] = new Complex(left[i], right[i]);
// }
// Complex[] temp = FastTransform.FFT(comp);
// for (int i = 0; i < temp.Length; i++)
// {
// complexNumbers[i] = temp[i].Magnitude();
// }
// subband = FFT.Subbands(complexNumbers);
// for (int i = 0; i < subband.Length; i++)
// {
// if (HistoryBufferCount > HistoryBuffer.Length-1)
// {
// HistoryBufferCount = 0;
// }
// HistoryBuffer[HistoryBufferCount] = subband[i];
// HistoryBufferCount++;
// }
// for (int i = 0; i < subband.Length; i++)
// {
// float average = FFT.AverageEnergy(HistoryBuffer);
// float variance = FFT.Variance(HistoryBuffer, average);
// if ((subband[i] > (average * 60)))//5800 for finalboss.mp3
// {
// BPM++;
// }
// }
// }
// Console.WriteLine("BPM: " + BPM);
//}
public static List <float> BPM(string filename, int toneDown = 1)
{
const float INSTANCETIME = 0.023256f;
BeatTimeStamps.Clear();
Signals.Clear();
AudioFileReader pcm = new AudioFileReader(filename);
DisplayInfo(pcm);
Energize e = new Energize();
List <float> bpms = new List <float>();
int oneMin = 0;
float[] input = new float[2048];
float[] HistoryBuffer = new float[43];
float[] left = new float[input.Length / 2];
float[] right = new float[input.Length / 2];
float[] mono = new float[input.Length / 2];
int read;
int SampleCount = 0;
int leftCount = 0;
int rightCount = 0;
float InstanceEnergy = 0;
float sampLocalEnergy = 0;
float C = 0;
int BPM = 0;
float timeDetected = 0.0f;
BeatSampleProvider samp = new BeatSampleProvider(pcm);
while ((read = samp.Read(input, 0, input.Length)) > 0)
{
leftCount = 0;
rightCount = 0;
for (int i = 0; i < input.Length - 1; i++)
{
if (i % 2 == 0)
{
left[leftCount] = input[i];
leftCount++;
}
else
{
right[rightCount] = input[i];
rightCount++;
}
}
for (int n = 0; n < mono.Length; n++)
{
mono[n] = (left[n] * .5f) + (right[n] * .5f);
}
if (oneMin == 60)
{
bpms.Add(BPM / toneDown);
oneMin = 0;
BPM = 0;
}
if (SampleCount < 43)
{
HistoryBuffer[SampleCount++] = InstanceEnergy = e.InstanceEnergy(left, right);
timeDetected += INSTANCETIME;
sampLocalEnergy = e.LocalEnergy(HistoryBuffer);
float variance = e.Varaince(HistoryBuffer, sampLocalEnergy);
C = e.C(variance);
if (InstanceEnergy > (C * sampLocalEnergy))
{
BPM++;
BeatTimeStamps.Add(timeDetected);
Signals.Add(FastFourierTransform.PopularFreq(mono));
}
}
else
{
oneMin++;
InstanceEnergy = e.InstanceEnergy(left, right);
SampleCount = 0;
timeDetected += INSTANCETIME;
// isFull = true;
sampLocalEnergy = e.LocalEnergy(HistoryBuffer);
float variance = e.Varaince(HistoryBuffer, sampLocalEnergy);
C = e.C(variance);
if (InstanceEnergy > (C * sampLocalEnergy))
{
BPM++;
BeatTimeStamps.Add(timeDetected);
Signals.Add(FastFourierTransform.PopularFreq(mono));
}
}
}
bpms.Add(BPM);
return(bpms);
}