/// <summary>
/// Analyzes the results and returns the BPM rate. Use this method to read result
/// after whole song data has been input to the class by consecutive calls of
/// <see cref="InputSamples"/>.
/// </summary>
/// <returns>The beats-per-minute rate, or zero if detection failed.</returns>
public float GetBpm()
{
var peakFinder = new PeakFinder();
// remove bias from xcorr data
RemoveBias();
var coeff = 60.0 * (_sampleRate / (double)_decimateBy);
// save bpm debug data if debug data writing enabled
SaveDebugData("soundtouch-bpm-xcorr.txt", _xcorr, _windowStart, _windowLen, coeff);
// Smoothen by N-point moving-average
Span <float> data = stackalloc float[_windowLen];
MAFilter(data, _xcorr, _windowStart, _windowLen, MOVING_AVERAGE_N);
// find peak position
double peakPos = peakFinder.DetectPeak(data, _windowStart, _windowLen);
// save bpm debug data if debug data writing enabled
SaveDebugData("soundtouch-bpm-smoothed.txt", data, _windowStart, _windowLen, coeff);
if (peakPos < 1e-9)
{
return(0); // detection failed.
}
SaveDebugBeatPos("soundtouch-detected-beats.txt", _beats);
// calculate BPM
float bpm = (float)(coeff / peakPos);
return((bpm >= MIN_BPM && bpm <= MAX_BPM_VALID) ? bpm : 0);
}
/// <summary>
/// Analyzes the results and returns the BPM rate. Use this function to
/// read result after whole song data has been input to the class by
/// consecutive calls of 'inputSamples' function.
/// </summary>
/// <returns>Beats-per-minute rate, or zero if detection failed.
/// </returns>
public float GetBpm()
{
var peakFinder = new PeakFinder();
double coeff = 60.0 * (_sampleRate / (double)DecimateBy);
// save bpm debug analysis data if debug data enabled
_SaveDebugData(Xcorr, WindowStart, WindowLen, coeff);
// find peak position
double peakPos = peakFinder.DetectPeak(Xcorr, WindowStart, WindowLen);
Debug.Assert(DecimateBy != 0);
if (peakPos < 1e-9)
{
return(0.0f); // detection failed.
}
// calculate BPM
return((float)(coeff / peakPos));
}
