private int AdjustPitchMark(WAVSound sound, int nominalPitchMarkIndex, int adjustmentIndexRange) //, double relativePeakThreshold, double energyComputationTimeRange)
{
int absoluteMaximum = Math.Abs(sound.Samples[0][nominalPitchMarkIndex]);
int threshold = (int)Math.Round(relativePeakThreshold * absoluteMaximum);
List <int> indicesOfLocalMaximaAboveThreshold = sound.GetIndicesOfLocalExtremaAboveThreshold(nominalPitchMarkIndex, adjustmentIndexRange, adjustmentIndexRange, threshold);
int adjustedPitchMarkIndex = nominalPitchMarkIndex; // sound.GetSampleIndexAtTime(timeOfAbsoluteMaximum); // Fallback value.
double minimumPreviousEnergy = double.MaxValue;
int energyComputationIndexRange = (int)Math.Round(energyComputationTimeRange * sound.SampleRate);
for (int ii = 0; ii < indicesOfLocalMaximaAboveThreshold.Count; ii++)
{
int indexOfLocalMaximumAboveThreshold = indicesOfLocalMaximaAboveThreshold[ii];
int energyComputationEndIndex = indexOfLocalMaximumAboveThreshold - 1;
if (energyComputationEndIndex >= sound.Samples[0].Count)
{
energyComputationEndIndex = sound.Samples[0].Count - 1;
}
int energyComputationStartIndex = indexOfLocalMaximumAboveThreshold - energyComputationIndexRange;
if (energyComputationStartIndex < 0)
{
energyComputationStartIndex = 0;
}
double localEnergy = sound.GetLocalEnergy(energyComputationStartIndex, energyComputationEndIndex);
if (localEnergy < minimumPreviousEnergy)
{
minimumPreviousEnergy = localEnergy;
adjustedPitchMarkIndex = indexOfLocalMaximumAboveThreshold;
}
}
return(adjustedPitchMarkIndex);
}
