private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
var ofd = new OpenFileDialog();
if (ofd.ShowDialog() != DialogResult.OK)
{
return;
}
using (var stream = new FileStream(ofd.FileName, FileMode.Open))
{
var waveFile = new WaveFile(stream);
_signal = waveFile[Channels.Left];
}
_stft = new Stft(_frameSize, _hopSize);
var frameDuration = (double)_frameSize / _signal.SamplingRate;
var hopDuration = (double)_hopSize / _signal.SamplingRate;
var freqs = new[] { 300f, 600, 1000, 2000, 4000, 7000 };
var pitchExtractor = new PitchExtractor(_signal.SamplingRate, frameDuration, hopDuration, high: 900 /*Hz*/);
var pitchTrack = pitchExtractor.ParallelComputeFrom(_signal)
.Select(p => p.Features[0])
.ToArray();
var tdExtractor = new TimeDomainFeaturesExtractor(_signal.SamplingRate, "all", frameDuration, hopDuration);
var spectralExtractor = new SpectralFeaturesExtractor(_signal.SamplingRate, "sc+sn", frameDuration, hopDuration, frequencies: freqs);
var mpeg7Extractor = new Mpeg7SpectralFeaturesExtractor(_signal.SamplingRate, "all", frameDuration, hopDuration);
mpeg7Extractor.IncludeHarmonicFeatures("all");
mpeg7Extractor.SetPitchTrack(pitchTrack);
tdExtractor.AddFeature("pitch_zcr", (signal, start, end) => { return(Pitch.FromZeroCrossingsSchmitt(signal, start, end)); });
//spectralExtractor.AddFeature("pitch_hss", (spectrum, fs) => { return Pitch.FromHss(spectrum, _signal.SamplingRate); } );
var tdVectors = tdExtractor.ParallelComputeFrom(_signal);
var spectralVectors = spectralExtractor.ParallelComputeFrom(_signal);
var mpeg7Vectors = mpeg7Extractor.ParallelComputeFrom(_signal);
_vectors = FeaturePostProcessing.Join(tdVectors, spectralVectors, mpeg7Vectors);
//FeaturePostProcessing.NormalizeMean(_vectors);
//FeaturePostProcessing.AddDeltas(_vectors);
var descriptions = tdExtractor.FeatureDescriptions
.Concat(spectralExtractor.FeatureDescriptions)
.Concat(mpeg7Extractor.FeatureDescriptions);
FillFeaturesList(_vectors, descriptions);
spectrogramPlot.ColorMapName = "afmhot";
spectrogramPlot.MarklineThickness = 2;
spectrogramPlot.Spectrogram = _stft.Spectrogram(_signal);
}
private void openToolStripMenuItem_Click(object sender, EventArgs e)
{
var ofd = new OpenFileDialog();
if (ofd.ShowDialog() != DialogResult.OK)
{
return;
}
using (var stream = new FileStream(ofd.FileName, FileMode.Open))
{
var waveFile = new WaveFile(stream);
_signal = waveFile[Channels.Left];
}
_fftSize = int.Parse(fftSizeTextBox.Text);
_cepstrumSize = int.Parse(cepstrumSizeTextBox.Text);
_hopSize = int.Parse(hopSizeTextBox.Text);
_fft = new RealFft(_fftSize);
_cepstralTransform = new CepstralTransform(_cepstrumSize, _fftSize);
var options = new PitchOptions
{
SamplingRate = _signal.SamplingRate,
FrameDuration = (double)_fftSize / _signal.SamplingRate,
HopDuration = (double)_hopSize / _signal.SamplingRate
};
var pitchExtractor = new PitchExtractor(options);
_pitches = pitchExtractor.ParallelComputeFrom(_signal);
_specNo = 0;
specNoComboBox.DataSource = Enumerable.Range(1, _pitches.Count).ToArray();
// obtain spectrogram
_stft = new Stft(_fftSize, _hopSize, WindowTypes.Rectangular);
var spectrogram = _stft.Spectrogram(_signal);
spectrogramPanel.ColorMapName = "viridis";
spectrogramPanel.MarklineThickness = 6;
spectrogramPanel.Spectrogram = spectrogram.Select(s => s.Take(224).ToArray()).ToList();
spectrogramPanel.Markline = _pitches.Select(p => p[0] * _fftSize / _signal.SamplingRate).ToArray();
}
public async void StartRecording()
{
if (_recorder != null)
{
StopRecording();
}
var context = Android.App.Application.Context;
var audioManager = (AudioManager)context.GetSystemService(Context.AudioService);
_samplingRate = int.Parse(audioManager.GetProperty(AudioManager.PropertyOutputSampleRate));
//_bufferSize = 4 * AudioRecord.GetMinBufferSize(_samplingRate, ChannelIn.Mono, Encoding.PcmFloat);
_bufferSize = 4 * AudioRecord.GetMinBufferSize(_samplingRate, ChannelIn.Mono, Encoding.Pcm16bit);
_recorder = new AudioRecord(AudioSource.Mic, _samplingRate, _channelCount, _audioEncodingType, _bufferSize);
//uncomment for PcmFloat mode: =====================
//_sizeInFloats = _bufferSize / sizeof(float);
//instead of Pcm16bit: =============================
_sizeInFloats = _bufferSize / sizeof(short);
_data = new float[1][];
_data[0] = new float[_sizeInFloats]; // only one channel (mono)
_bytes = new byte[_bufferSize];
_temp = new byte[_sizeInFloats * sizeof(float)];
var options = new PitchOptions
{
SamplingRate = _samplingRate,
FrameDuration = (double)_sizeInFloats / _samplingRate
};
_pitchExtractor = new PitchExtractor(options);
_pitch = new float[1];
_robotizer = new RobotEffect(216, 1024);
_recorder.StartRecording();
_isRecording = true;
await ProcessAudioData();
}