public static void PreprocessWithAbsEnvelope(string filePath)
{
Console.WriteLine($"Pre-processing with Abs and Envelope of file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
for (int i = 0; i < signal.Length; i++)
{
signal.Samples[i] = Math.Abs(signal.Samples[i]);
}
// smooth signal with envelope
DiscreteSignal envelope = Operation.Envelope(signal);
using (var stream = new FileStream($"{DATA_PATH}/abs-envelope.wav", FileMode.Create))
{
var signalFile = new WaveFile(envelope);
signalFile.SaveTo(stream);
}
}
}
private void SaveToFile()
{
using (var tempStream = new FileStream(TempFileName, FileMode.Open))
using (var br = new BinaryReader(tempStream))
{
var samples = new float[tempStream.Length / sizeof(float)];
for (var i = 0; i < samples.Length; i++)
{
samples[i] = br.ReadSingle();
}
var waveFile = new WaveFile(new DiscreteSignal(_samplingRate, samples));
using (var outputStream = new FileStream(OutputFileName, FileMode.Create))
{
waveFile.SaveTo(outputStream);
}
}
using (var file = new Java.IO.File(TempFileName))
{
file.Delete();
}
}
private async void playToolStripMenuItem_Click(object sender, EventArgs e)
{
if (_waveFileName == null || _isPaused)
{
return;
}
// Play after filter
string wavePlay = "wavPlay.wav";
try
{
using (var stream = new FileStream(wavePlay, FileMode.Create))
{
var waveFile = new WaveFile(_signal);
waveFile.SaveTo(stream);
}
}
catch (IOException ex)
{
Console.WriteLine("Error reading from {0}. Message = {1}", wavePlay, ex.Message);
}
_hasStartedPlaying = true;
await _player.PlayAsync(wavePlay);
_hasStartedPlaying = false;
}
public static void PreprocessWithEnvelope(string filePath)
{
Console.WriteLine($"Pre-processing for word count of file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
// smooth signal with envelope
DiscreteSignal envelope = Operation.Envelope(signal);
// instance of SimpleGate
SimpleGate sg = new SimpleGate(30, 30, envelope.SamplingRate);
for (int i = 0; i < envelope.Length; i++)
{
double inValue = envelope.Samples[i];
sg.Process(ref inValue);
envelope.Samples[i] = (float)inValue;
}
using (var stream = new FileStream($"{DATA_PATH}/envelope.wav", FileMode.Create))
{
var signalFile = new WaveFile(envelope);
signalFile.SaveTo(stream);
}
}
}
public static void PreprocessForWordCount(string filePath)
{
Console.WriteLine($"Pre-processing for word count of file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
// smooth signal via moving average filter
var maFilter = new MovingAverageFilter(19);
DiscreteSignal smoothedSignal = maFilter.ApplyTo(signal);
// instance of SimpleGate
SimpleGate sg = new SimpleGate(30, 30, smoothedSignal.SamplingRate);
for (int i = 0; i < smoothedSignal.Length; i++)
{
double inValue = smoothedSignal.Samples[i];
sg.Process(ref inValue);
smoothedSignal.Samples[i] = (float)inValue;
}
using (var stream = new FileStream($"{DATA_PATH}/preprocessed.wav", FileMode.Create))
{
var signalFile = new WaveFile(smoothedSignal);
signalFile.SaveTo(stream);
}
}
}
public async void PlayAsync(EffectsProperties properties)
{
if (waveFile != null)
{
// Convert wave file to discrete signal
var signal = delay.WaveToSignal(waveFile);
// Process delay
DiscreteSignal delayProcessed = delay.Process(
signal,
properties.DelaySamples, properties.DelayGain,
properties.DelayVolume, properties.DelayBypass);
// Process flanger
DiscreteSignal flangerProcessed = flanger.Process(
delayProcessed,
properties.FlangerSamples, properties.FlangerGain,
properties.FlangerVolume, properties.FlangerSpeed,
properties.FlangerBypass);
// Process chorus
DiscreteSignal chorusProcessed = chorus.Process(
flangerProcessed,
properties.ChorusMiliseconds, properties.ChorusGain1,
properties.ChorusGain2, properties.ChorusVolume,
properties.ChorusBypass);
// Process distortion
DiscreteSignal distProcessed = distortion.Process(
chorusProcessed,
properties.DistGain, properties.DistDistortion,
properties.DistVolume, properties.DistBypass
);
// Redirect last proccesed effect to output
var output = distProcessed;
if (audioPlayer == null)
{
audioPlayer = new MciAudioPlayer();
}
audioPlayer.Stop();
// Save processed file to stream
var processedFileName = string.Format("{0}.wav", Guid.NewGuid());
using (var stream = new FileStream(processedFileName, FileMode.Create))
{
var waveFile = new WaveFile(output);
waveFile.SaveTo(stream);
}
await audioPlayer.PlayAsync(processedFileName);
// cleanup temporary file
File.Delete(processedFileName);
}
}
public static void TestSimpleGate(string filePath)
{
Console.WriteLine($"Testing 'SingleGate' class with file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
List <Tuple <int, int> > attackReleaseValues = new List <Tuple <int, int> > {
new Tuple <int, int>(5, 5),
new Tuple <int, int>(5, 10),
new Tuple <int, int>(10, 5),
new Tuple <int, int>(10, 10),
new Tuple <int, int>(10, 15),
new Tuple <int, int>(15, 10),
new Tuple <int, int>(15, 15),
new Tuple <int, int>(15, 20),
new Tuple <int, int>(20, 15),
new Tuple <int, int>(20, 20),
new Tuple <int, int>(20, 25),
new Tuple <int, int>(25, 20),
new Tuple <int, int>(25, 25),
};
// for each attack/release pair combination
for (int i = 0; i < attackReleaseValues.Count; i++)
{
int attack, release;
attack = attackReleaseValues[i].Item1;
release = attackReleaseValues[i].Item2;
// instance of SimpleGate
SimpleGate sg = new SimpleGate(attack, release, signal.SamplingRate);
for (int j = 0; j < signal.Length; j++)
{
double inValue = signal.Samples[j];
sg.Process(ref inValue);
signal.Samples[j] = (float)inValue;
}
using (var stream = new FileStream($"{DATA_PATH}/gate-{attack}-{release}.wav", FileMode.Create))
{
var signalFile = new WaveFile(signal);
signalFile.SaveTo(stream);
}
}
}
}
public async Task PlayAsync(DiscreteSignal signal, int startPos = 0, int endPos = -1, short bitDepth = 16)
{
var stream = new MemoryStream();
var wave = new WaveFile(signal, bitDepth);
wave.SaveTo(stream);
stream = new MemoryStream(stream.ToArray());
_player?.Dispose();
_player = new SoundPlayer(stream);
_player.Stream.Seek(0, SeekOrigin.Begin);
_player.Play();
}
private void saveToolStripMenuItem_Click(object sender, EventArgs e)
{
var sfd = new SaveFileDialog();
if (sfd.ShowDialog() != DialogResult.OK)
{
return;
}
using (var stream = new FileStream(sfd.FileName, FileMode.Create))
{
var waveFile = new WaveFile(_signal2);
waveFile.SaveTo(stream);
}
}
public static void WordCountSignalPreprocessing(string filePath)
{
Console.WriteLine($"Pre-processing for word count of file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
DiscreteSignal preprocessed = ManualWordCount.PreprocessAudio(signal);
using (var stream = new FileStream($"{DATA_PATH}/word-count-preprocessed.wav", FileMode.Create))
{
var signalFile = new WaveFile(preprocessed);
signalFile.SaveTo(stream);
}
}
}
public MemoryStream GenerateWAV()
{
var signal = GetSignal();
stopwatch.Restart();
MemoryStream output;
using (MemoryStream stream = new MemoryStream())
{
var waveFile = new WaveFile(signal, 32);
waveFile.SaveTo(stream);
output = new MemoryStream(stream.ToArray());
}
OnProgressChanged(new GenerationProgressChangedEventArgs(5, 5, "MemoryStream writing", stopwatch.Elapsed));
stopwatch.Stop();
return(output);
}
private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
{
var sfd = new SaveFileDialog()
{
Filter = "wav | *.wav | mp3 | *.mp3",
AddExtension = true,
DefaultExt = "wav"
};
if (sfd.ShowDialog() != DialogResult.OK)
{
return;
}
using (var stream = new FileStream(sfd.FileName, FileMode.Create))
{
var waveFile = new WaveFile(_signal * 2);
waveFile.SaveTo(stream);
}
}
public static DiscreteSignal PreprocessAudio(DiscreteSignal signal)
{
// smooth signal via moving average filter
var maFilter = new MovingAverageFilter(19);
DiscreteSignal smoothedSignal = maFilter.ApplyTo(signal);
using (var stream = new FileStream("smoothedSignal.wav", FileMode.Create))
{
var signalFile = new WaveFile(smoothedSignal);
signalFile.SaveTo(stream);
}
// pre-process signal with SimpleGate
SimpleGate sg = new SimpleGate(30, 30, smoothedSignal.SamplingRate);
// apply for each measured sample
for (int i = 0; i < smoothedSignal.Length; i++)
{
double inValue = smoothedSignal.Samples[i];
sg.Process(ref inValue);
smoothedSignal.Samples[i] = (float)inValue;
}
// apply envelope operation
DiscreteSignal envelopeSignal = Operation.Envelope(smoothedSignal);
using (var stream = new FileStream("envelopeSignal.wav", FileMode.Create))
{
var signalFile = new WaveFile(envelopeSignal);
signalFile.SaveTo(stream);
}
return envelopeSignal;
}
public static void TestMovingAverageFilter(string filePath)
{
Console.WriteLine($"Testing 'MovingAverage' filters on file {filePath}");
using (var afr = new FileStream(filePath, FileMode.Open))
{
// create a signal file
var waveFile = new WaveFile(afr);
DiscreteSignal signal = waveFile[Channels.Left];
int[] wSizes = new int[] { 3, 7, 11, 15, 19, 23, 27, 31, 35, 39, 43, 47, 51 };
for (int i = 0; i < wSizes.Length; i++)
{
// build moving average filter of specified window size
int wSize = wSizes[i];
var maFilter = new MovingAverageFilter(wSize);
// apply moving average filter
DiscreteSignal smoothed = maFilter.ApplyTo(signal);
// compute signal differences
DiscreteSignal diff = Operation.SpectralSubtract(signal, smoothed);
using (var stream = new FileStream($"{DATA_PATH}/moving-average-{wSize}.wav", FileMode.Create))
{
var smoothedFile = new WaveFile(smoothed);
smoothedFile.SaveTo(stream);
}
using (var stream = new FileStream($"{DATA_PATH}/diff-original-smoothed-{wSize}.wav", FileMode.Create))
{
var diffFile = new WaveFile(diff);
diffFile.SaveTo(stream);
}
}
}
}
