public AutoTuneWaveProvider(IWaveProvider source, AutoTuneSettings autoTuneSettings)
{
this.autoTuneSettings = autoTuneSettings;
if (source.WaveFormat.SampleRate != 44100)
throw new ArgumentException("AutoTune only works at 44.1kHz");
if (source.WaveFormat.Encoding != WaveFormatEncoding.IeeeFloat)
throw new ArgumentException("AutoTune only works on IEEE floating point audio data");
if (source.WaveFormat.Channels != 1)
throw new ArgumentException("AutoTune only works on mono input sources");
this.source = source;
this.pitchDetector = new AutoCorrelator(source.WaveFormat.SampleRate);
this.pitchShifter = new SmbPitchShifter(Settings);
this.waveBuffer = new WaveBuffer(8192);
}
private void Test()
{
float[] buffer = new float[4096];
IPitchDetector pitchDetector = new AutoCorrelator(44100);
for (int midiNoteNumber = 45; midiNoteNumber < 63; midiNoteNumber++)
{
float freq = (float)(8.175 * Math.Pow(1.05946309, midiNoteNumber));
SetFrequency(buffer, freq);
float detectedPitch = pitchDetector.DetectPitch(buffer, buffer.Length);
// since the autocorrelator works with a lag, give it two shots at the same buffer
detectedPitch = pitchDetector.DetectPitch(buffer, buffer.Length);
Console.WriteLine("Testing for {0:F2}Hz, got {1:F2}Hz", freq, detectedPitch);
//Assert.AreEqual(detectedPitch, freq, 0.5);
}
}
public void TestSineWaveDetectionAutocorrelator()
{
float[] buffer = new float[4096];
IPitchDetector pitchDetector = new AutoCorrelator(sampleRate);
TestPitchDetection(buffer, pitchDetector);
}
public void TestEmptyBufferDoesntDetectAPitch()
{
AutoCorrelator autoCorrelator = new AutoCorrelator(sampleRate);
float pitch = autoCorrelator.DetectPitch(new float[1024], 1024);
Assert.AreEqual(0f,pitch);
}