public void CopyToFloatArray()
{
Signal target = Signal.FromArray(data, 8000);
float[] dest = new float[12];
target.CopyTo(dest);
Assert.AreEqual(data.Reshape(), dest);
float[] larger = new float[20];
target.CopyTo(larger);
Assert.AreEqual(Vector.Create(20, data.Reshape()), larger);
}
/// <summary>
/// Encodes the Wave stream into a Signal object.
/// </summary>
///
public void Encode(Signal signal)
{
if (!initialized)
{
initialize(signal);
firstWriteHeaders();
}
// Update counters
numberOfSamples += signal.NumberOfSamples;
numberOfFrames += signal.Length;
bytes += signal.NumberOfBytes;
duration += (int)signal.Duration.TotalMilliseconds;
// Navigate to start position
long position = waveStream.Position;
waveStream.Seek(0, SeekOrigin.Begin);
// Update headers
updateHeaders();
// Go back to previous position
waveStream.Seek(position, SeekOrigin.Begin);
if (buffer == null || buffer.Length < signal.NumberOfBytes)
{
buffer = new byte[signal.NumberOfBytes];
}
signal.CopyTo(buffer);
// Write the current signal data
waveStream.Write(buffer, 0, signal.NumberOfBytes);
}
private double[] getWholeSignal()
{
Signal tempSignal = this.decoder.Decode(this.frames);
double[] wholeSignal = new double[this.frames];
tempSignal.CopyTo(wholeSignal);
return(wholeSignal);
}
public void addNewFrame(Signal signal)
{
// Save current frame
signal.CopyTo(current);
// Save to memory
this.encoder.Encode(signal);
// Update counters
this.duration += signal.Duration;
this.samples += signal.Samples;
this.frames += signal.Length;
}
/// <summary>
/// Open the given audio file and return an "AudioSignal" with the following info:
/// 1. data[]: array of audio samples
/// 2. sample rate
/// 3. signal length in milli sec
/// </summary>
/// <param name="filePath">audio file path</param>
/// <returns>AudioSignal containing its data, sample rate and length in ms</returns>
public static AudioSignal OpenAudioFile(string filePath)
{
WaveDecoder waveDecoder = new WaveDecoder(filePath);
AudioSignal signal = new AudioSignal();
signal.sampleRate = waveDecoder.SampleRate;
signal.signalLengthInMilliSec = waveDecoder.Duration;
Signal tempSignal = waveDecoder.Decode(waveDecoder.Frames);
signal.data = new double[waveDecoder.Frames];
tempSignal.CopyTo(signal.data);
return(signal);
}
public void waveInput()
{
writeHeaderForARFF();
for (int i = 0; i < audioFileName.Length; i++)
{
string type;
string name;
setTypeAndName(audioFileName[i], out type, out name);
Accord.Audio.Formats.WaveDecoder currentWav = new Accord.Audio.Formats.WaveDecoder(audioFileName[i]);
//Used for time Domain
Signal timeDomain = currentWav.Decode();
//Creates an array of time domain samples for use in calculation of RootMeanSquare aka AverageEnergy
float[] energyArray = new float[timeDomain.Samples];
timeDomain.CopyTo(energyArray);
//average energy for the current wav file
double averageEnergy = Accord.Audio.Tools.RootMeanSquare(energyArray);
//ZCR for the current wav file
double zeroCrossingRate = zeroCrossingRateMethod(timeDomain);
Accord.Audio.Windows.RaisedCosineWindow window = Accord.Audio.Windows.RaisedCosineWindow.Hamming(1024);
Signal[] windows = timeDomain.Split(window, 512);
//Used for Frequency Domain
ComplexSignal[] tempFrequency = windows.Apply(ComplexSignal.FromSignal);
tempFrequency.ForwardFourierTransform();
ComplexSignal curComplex = tempFrequency[0];
double[] power = { };
double[] magnitudes = { };
double[] freq = { };
var length = curComplex.Length / (2 + 1);
double[] meanPower = new double[length];
double[] meanMagnitudes = new double[length];
createFrequencyArray(tempFrequency, curComplex, out power, out magnitudes, out freq, out meanPower, out meanMagnitudes);
//Spectral Centrois for the current wav file
double spectralCentroid = meanMagnitudes.Zip(freq, (m, f) => m * f).Sum() / meanMagnitudes.Sum();
//double spectralCentroid = spectralCentroidMethod(tempFrequency);
//Writes data to arff file
writeARFF(name, averageEnergy, zeroCrossingRate, spectralCentroid, type);
}
}
public void AudioOutputMethod(Signal input)
{
if (audioOutputDeviceOwnerHandle == null)
{
return;
}
if (audioOutputDevice == null)
{
InitAudioOutputDevice(input);
}
encoder.Encode(input);
float[] samples = new float[input.Samples];
input.CopyTo(samples);
audioOutputDevice.Play();
}
private void output_NewFrameRequested(object sender, NewFrameRequestedEventArgs e)
{
e.FrameIndex = decoder.Position;
Signal s = decoder.Decode(e.Frames);
if (s == null)
{
e.Stop = true;
}
else
{
// Inform the number of frames
// actually read from source
e.Frames = s.Length;
// Copy the signal to the buffer
s.CopyTo(e.Buffer);
}
}
private void AudioOutputDeviceNewFrameRequested(object sender, NewFrameRequestedEventArgs e)
{
if (decoder == null)
{
return;
}
e.FrameIndex = decoder.Position;
Signal signal = decoder.Decode(e.Frames);
if (signal == null)
{
e.Stop = true;
return;
}
e.Frames = signal.Length;
signal.CopyTo(e.Buffer);
}
/// <summary>
/// This event is triggered when the sound card needs more samples to be
/// played. When this happens, we have to feed it additional frames so it
/// can continue playing.
/// </summary>
///
private void output_NewFrameRequested(object sender, NewFrameRequestedEventArgs e)
{
// This is the next frame index
e.FrameIndex = decoder.Position;
// Attempt to decode the requested number of frames from the stream
Signal signal = decoder.Decode(e.Frames);
if (signal == null)
{
// We could not get the requested number of frames. When
// this happens, this is an indication we need to stop.
e.Stop = true;
return;
}
// Inform the number of frames
// actually read from source
e.Frames = signal.Length;
// Copy the signal to the buffer
signal.CopyTo(e.Buffer);
}
public void FillNewFrame(NewFrameRequestedEventArgs frameRequestArgs)
{
// This is the next frame index
frameRequestArgs.FrameIndex = this.decoder.Position;
// Attempt to decode the requested number of frames from the stream
Signal signal = this.decoder.Decode(frameRequestArgs.Frames);
if (signal == null)
{
// We could not get the requested number of frames. When
// this happens, this is an indication we need to stop.
frameRequestArgs.Stop = true;
return;
}
// Inform the number of frames
// actually read from source
frameRequestArgs.Frames = signal.Length;
// Copy the signal to the buffer
signal.CopyTo(frameRequestArgs.Buffer);
}
