| public static MakeHammingWindow ( float data ) : void | ||
| data | float | |
| return | void | |
public void GetMidiCodes(int offset, int fftSize = 4096, int maxFreq = 5000)
{
AudioClip clip;
float[] real, im, window;
FloatFFT fft;
string assetPath;
float binWidth;
List <FFTBinInfo> binInfos;
int i;
real = new float[fftSize];
im = new float[fftSize];
window = new float[fftSize];
GATMaths.MakeHammingWindow(window);
fft = new FloatFFT();
fft.init(( uint )Mathf.Log(fftSize, 2));
binWidth = ( float )_sampleRate / fftSize;
int maxBin = ( int )(( float )maxFreq / binWidth);
foreach (GATSampleInfo info in _sampleInfos)
{
assetPath = AssetDatabase.GUIDToAssetPath(info.GUID);
clip = AssetDatabase.LoadAssetAtPath(assetPath, typeof(AudioClip)) as AudioClip;
if (clip.channels > 1)
{
throw new GATException("Get Midi Codes is a beta feature only available for mono clips");
}
clip.GetData(real, offset);
System.Array.Clear(im, 0, im.Length);
fft.run(real, im);
for (i = 0; i < maxBin; i++)
{
real[i] = Mathf.Sqrt(real[i] * real[i] + im[i] * im[i]);
}
binInfos = FFTBinInfo.GetLowerMaxBins(real, 0, maxBin, binWidth, .2f);
info.MidiCode = binInfos[binInfos.Count - 1].GetMidiCode();
}
SortByMidiCode();
}
/// <summary>
/// Sets and pre-computes the specified
/// WindowFunction for faster processing.
/// </summary>
public void SetWindow(WindowFunction windowFunction)
{
if (_windowData == null || _windowData.Length != _appliedFFTSize)
{
_windowData = new float[_appliedFFTSize];
}
switch (window)
{
case WindowFunction.Hanning:
GATMaths.MakeHanningWindow(_windowData);
break;
case WindowFunction.Hamming:
GATMaths.MakeHammingWindow(_windowData);
break;
}
}