/// <summary>
/// Returns the sample closest to the provided midicode and a pitch shift value
/// to be applied to the sample
/// </summary>
/// <returns>The sample index for midi code.</returns>
/// <param name="midiCode">Midi code.</param>
/// <param name="pitchShift">Pitch shift.</param>
public GATData GetClosestSampleForMidiCode(float midiCode, out float pitchShift)
{
int index = _allSamples.Count - 1;
int i;
GATSampleInfo info;
float delta;
float minDelta = float.MaxValue;
for (i = 0; i < _allSamples.Count; i++)
{
info = _soundBank.SampleInfos[i];
delta = Mathf.Abs(midiCode - info.MidiCode);
if (delta < minDelta)
{
minDelta = delta;
}
else
{
index = i - 1;
break;
}
}
pitchShift = GATMaths.GetRatioForInterval(midiCode - ( float )_soundBank.SampleInfos[index].MidiCode);
return(_allSamples[index]);
}
/// <summary>
/// Creates a new PatternSample for insertion in a PulsedPatternModule.
/// </summary>
public PatternSample(string sampleName, float gain = 1f, int semiTones = 0)
{
_sampleName = sampleName;
_gain = gain;
_semiTones = semiTones;
_pitch = GATMaths.GetRatioForInterval(semiTones);
}
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();
}
void SetPitch(double newPitch)
{
if (newPitch == _nextPitch)
{
return;
}
_nextPitch = newPitch;
_needsDataUpdate = true;
if (envelope == GATEnvelope.nullEnvelope)
{
_cachedLength = GATMaths.ResampledLength(sourceSample.Count, _nextPitch);
_needsNewContainer = true;
}
}
protected void FillWithResampledData(GATData sourceData, GATData targetData, int fromIndex, int targetLength, double pitch)
{
//check that we have enough samples to fulfill the request:
int appliedLength = GATMaths.ClampedResampledLength(sourceData.Count - fromIndex, targetLength, pitch);
if (appliedLength < 0)
{
#if GAT_DEBUG
Debug.LogWarning("requested offset is out of bounds.");
#endif
return;
}
sourceData.ResampleCopyTo(fromIndex, targetData, appliedLength, pitch);
//if we did not have enough samples, clear the rest:
if (appliedLength < targetLength)
{
targetData.Clear(appliedLength, targetData.Count - appliedLength);
}
}
public static List <FFTBinInfo> GetLowerMaxBins(float[] magnitudes, int fromIndex, int toIndex, float binFrequencyWidth, float magThresholdRatio)
{
List <FFTBinInfo> maxBins = new List <FFTBinInfo>();
FFTBinInfo binInfo;
int maxIndex;
float magThreshold;
fromIndex++;
toIndex--;
maxIndex = GATMaths.GetIndexOfMaxValue(magnitudes, fromIndex, toIndex);
binInfo = new FFTBinInfo(magnitudes, maxIndex, binFrequencyWidth);
maxBins.Add(binInfo);
magThreshold = binInfo.InterpolatedMagnitude * magThresholdRatio;
while (true)
{
toIndex = binInfo.BinIndex - 1;
if (toIndex - fromIndex < 3)
{
break;
}
maxIndex = GATMaths.GetIndexOfMaxValue(magnitudes, fromIndex, toIndex);
binInfo = new FFTBinInfo(magnitudes, maxIndex, binFrequencyWidth);
if (binInfo.InterpolatedMagnitude < magThreshold)
{
break;
}
maxBins.Add(binInfo);
}
return(maxBins);
}
/// <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;
}
}
