// prepare batch for processing
private float[] PrepareInputs(int count)
{
// define overlap
if (m_position >= count)
{
m_position -= (int)(float)(count * 0.5);
}
// Set Label
if (m_wavReader != null && m_wavReader.HasTranscription)
{
char c = m_wavReader.GetTranscription((int)m_position, (int)m_position + count);
int index = StringToDigitIndexes(c);
Array.Clear(Owner.Label.Host, 0, Owner.Label.Count);
// if unknown character, continue without setting any connection
Owner.Label.Host[index] = 1.00f;
Owner.Label.SafeCopyToDevice();
}
// if input is corpus, cycle files in the set
float[] result = new float[count];
if (Owner.InputType == InputTypeEnum.UserDefined && Owner.m_InputPathCorpus != "")
{
bool eof = (m_position + count < m_InputData.Length)?false: true;
for (int i = 0; i < count; i++)
{
result[i] = (float)m_InputData[m_position];
m_position = ++m_position % m_InputData.Length;
}
if (eof)
{
m_position = 0;
m_wavReader = new WavPlayer(audio[m_currentCorpusFile]);
AttachTranscriptFileIfExists(audio[m_currentCorpusFile]);
if (m_currentCorpusFile + 1 < audio.Length)
{
m_currentCorpusFile++;
}
else
{
m_currentCorpusFile = 0;
}
m_InputData = m_wavReader.ReadShort(m_wavReader.m_length);
}
}
else // if input is single audio, cycle the file itself
{
for (int i = 0; i < count; i++)
{
result[i] = (float)m_InputData[m_position];
m_position = ++m_position % m_InputData.Length;
}
}
return(result);
}
public override void Execute()
{
if (SimulationStep == 0)
{
#region First step init
m_position = 0;
Owner.Features.Fill(0);
Owner.Label.Fill(0);
try
{ // load input data on simulation start
switch (Owner.m_UserInput)
{
case InputTypeEnum.SampleSound:
m_wavReader = new WavPlayer(GoodAI.SoundWorld.Properties.Resources.Digits_en_wav);
m_wavReader.m_SamplesPerSec = 32000;
m_wavReader.AttachTranscription(GoodAI.SoundWorld.Properties.Resources.Digits_en_txt);
m_InputData = m_wavReader.ReadShort(m_wavReader.m_length);
break;
case InputTypeEnum.UserDefined:
// reading corpus files
if (Owner.m_InputPathCorpus != "")
{
audio = Directory.GetFiles(Owner.m_InputPathCorpus, "*.wav");
m_wavReader = new WavPlayer(audio[m_currentCorpusFile]);
AttachTranscriptFileIfExists(audio[m_currentCorpusFile]);
m_currentCorpusFile = 1;
m_InputData = m_wavReader.ReadShort(m_wavReader.m_length);
}
else
{
m_wavReader = new WavPlayer(Owner.m_InputPathAudio);
AttachTranscriptFileIfExists(Owner.m_InputPathAudio);
m_InputData = m_wavReader.ReadShort(m_wavReader.m_length);
}
break;
}
}
catch (Exception)
{
MyLog.ERROR.WriteLine("Not a valid sound device!");
}
#endregion
}
if (SimulationStep % ExpositionTime == 0)
{
#region Every time step
if (m_InputData == null)
{
return;
}
int size = 0;
float[] result = new float[Owner.FeaturesCount];
// process data according to chosen feature type
switch (Owner.FeaturesType)
{
case FeatureType.Samples:
result = PrepareInputs(Owner.FeaturesCount);
break;
case FeatureType.FFT:
// input size must be power of 2 and double sized due to the mirror nature of FFT
size = NextPowerOf2(Owner.FeaturesCount * 2);
result = PerformFFT(PrepareInputs(size));
//result = PerformFFT(GenerateSine(size)); // generate a test sine signal
break;
case FeatureType.MFCC:
result = WindowFunction.Hanning(PrepareInputs(256));
result = PerformFFT(result);
result = MFCC.Compute(result, player.m_SamplesPerSec, Owner.FeaturesCount);
break;
case FeatureType.LPC:
result = WindowFunction.Hanning(PrepareInputs(256));
result = LPC.Compute(result, Owner.FeaturesCount);
break;
}
#endregion
// flush processed features into GPU
Array.Clear(Owner.Features.Host, 0, Owner.Features.Count);
for (int i = 0; i < Owner.FeaturesCount; i++)
{
Owner.Features.Host[i] = result[i];
}
Owner.Features.SafeCopyToDevice();
}
}