// 20170803
#region Comments
// This method uses Steps 2-4 of the YIN method (Cheveigne and Kawahara, 2002).
// (Step 1 is only used (in the paper) for comparison, and Steps 5-6 only provide
// minor absolute improvements.
#endregion
/* public double GetPitchPeriod(WAVSound sound, double time, double maximumPitchPeriod, double threshold)
* {
* int sampleIndex = sound.GetSampleIndexAtTime(time);
* int maximumIndexDuration = (int)Math.Round(maximumPitchPeriod * sound.SampleRate);
* double minimum = double.MaxValue;
* double pitchPeriod = 0;
* List<double> periodList = new List<double>();
* List<double> shiftedSquareDifferenceList = new List<double>();
* List<double> normalizedShiftedSquaredDifferenceList = new List<double>();
* periodList.Add(0);
* shiftedSquareDifferenceList.Add(0);
* normalizedShiftedSquaredDifferenceList.Add(1);
*
* for (int ii = 1; ii <= maximumIndexDuration; ii++)
* {
* int indexDuration = ii;
* double shiftedSquareDifference = sound.GetShiftedSquareDifference(sampleIndex, ii, maximumIndexDuration);
* shiftedSquareDifferenceList.Add(shiftedSquareDifference);
* double period = indexDuration / (double)sound.SampleRate;
* periodList.Add(period);
* double average = shiftedSquareDifferenceList.Average();
* double normalizedShiftedSquareDifference = shiftedSquareDifference / average;
* if (normalizedShiftedSquareDifference < minimum)
* {
* minimum = normalizedShiftedSquareDifference;
* pitchPeriod = period;
* }
* normalizedShiftedSquaredDifferenceList.Add(normalizedShiftedSquareDifference);
* }
* int minimumIndex = FindFirstMinimum(normalizedShiftedSquaredDifferenceList, threshold);
* if (minimumIndex > 0) // Otherwise use the global minimum, computed above.
* {
* pitchPeriod = minimumIndex / (double)sound.SampleRate;
* }
* return pitchPeriod;
* } */
public double ComputeFramePitchPeriod(WAVSound sound, double time)
// , double minimumPitchPeriod, double maximumPitchPeriod)
{
int sampleIndex = sound.GetSampleIndexAtTime(time);
int minimumIndexDuration = (int)Math.Round(minimumPitchPeriod * sound.SampleRate);
int maximumIndexDuration = (int)Math.Round(maximumPitchPeriod * sound.SampleRate);
double minimumAverageMagnitudeDifference = double.MaxValue;
int indexDurationAtMinimum = 0;
for (int ii = minimumIndexDuration; ii <= maximumIndexDuration; ii++)
{
double averageMagnitudeDifference = sound.GetAbsoluteMagnitudeDifference(sampleIndex, ii, maximumIndexDuration);
if (averageMagnitudeDifference < minimumAverageMagnitudeDifference)
{
minimumAverageMagnitudeDifference = averageMagnitudeDifference;
indexDurationAtMinimum = ii;
}
}
double pitchPeriod = indexDurationAtMinimum / (double)sound.SampleRate;
return(pitchPeriod);
}
// Note: it is assumed that both channels (left and right) are equal.
public WAVSound ChangePitch(WAVSound sound, List <double> pitchMarkTimeList, double relativeStartPitch, double relativeEndPitch)
{
// First find the pitch mark indices in the original sound:
List <int> originalPitchMarkIndexList = new List <int>();
foreach (double pitchMarkTime in pitchMarkTimeList)
{
int originalPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTime);
originalPitchMarkIndexList.Add(originalPitchMarkIndex);
}
// Next, compute the index spacings of the pitch marks in the modified sound:
double originalSoundDuration = sound.GetDuration();
List <int> modifiedPitchMarkIndexSpacingList = new List <int>();
modifiedPitchMarkTimeList = new List <double>();
double firstModifiedPitchMarkTime = pitchMarkTimeList[0]; // First pitch mark unchanged
modifiedPitchMarkTimeList.Add(firstModifiedPitchMarkTime);
for (int ii = 1; ii < originalPitchMarkIndexList.Count; ii++)
{
int originalPitchMarkSpacing = originalPitchMarkIndexList[ii] - originalPitchMarkIndexList[ii - 1];
double relativePitch = relativeStartPitch + (pitchMarkTimeList[ii] / originalSoundDuration) * (relativeEndPitch - relativeStartPitch);
int modifiedPitchMarkIndexSpacing = (int)Math.Round(originalPitchMarkSpacing / relativePitch);
modifiedPitchMarkIndexSpacingList.Add(modifiedPitchMarkIndexSpacing);
double modifiedPitchMarkTime = modifiedPitchMarkTimeList.Last() + (double)modifiedPitchMarkIndexSpacing / (double)sound.SampleRate;
modifiedPitchMarkTimeList.Add(modifiedPitchMarkTime);
}
// Now build the sound, keeping the original sound data over a fraction (topFraction) of the pitch periods
// and interpolating between pitch periods:
List <short> newSamples = new List <short>();
// Special treatment of the first pitch period:
int firstPitchMarkIndex = originalPitchMarkIndexList[0]; // Position of the first pitch mark in the original sound
int firstModifiedPitchMarkIndexSpacing = modifiedPitchMarkIndexSpacingList[0]; // Spacing between the first and second pitch mark in the modified sound
int firstTopEndIndex = firstPitchMarkIndex + (int)Math.Round(topFraction * firstModifiedPitchMarkIndexSpacing);
for (int ii = 0; ii < firstTopEndIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
for (int iPitchMark = 1; iPitchMark < originalPitchMarkIndexList.Count; iPitchMark++)
{
// First add samples for the transition from the previous pitch period to the current one:
int modifiedPitchMarkIndexSpacing = modifiedPitchMarkIndexSpacingList[iPitchMark - 1]; // -1 since there are n-1 spacings for n pitch marks
int transitionIndexDuration = (int)Math.Round((1 - 2 * topFraction) * modifiedPitchMarkIndexSpacing);
int previousPitchMarkIndex = originalPitchMarkIndexList[iPitchMark - 1];
int previousTopEndIndex = previousPitchMarkIndex + (int)Math.Round(topFraction * modifiedPitchMarkIndexSpacing);
int startIndexPreviousPitchPeriod = previousTopEndIndex;
int currentPitchMarkIndex = originalPitchMarkIndexList[iPitchMark];
int currentTopStartIndex = currentPitchMarkIndex - (int)Math.Round(topFraction * modifiedPitchMarkIndexSpacing);
for (int ii = 0; ii < transitionIndexDuration; ii++)
{
double alpha = (double)ii / (double)(transitionIndexDuration - 1);
int previousPitchPeriodSampleIndex = previousTopEndIndex + ii;
int currentPitchPeriodSampleIndex = currentTopStartIndex - transitionIndexDuration + ii;
short newSample = (short)Math.Round(((1 - alpha) * sound.Samples[0][previousPitchPeriodSampleIndex] +
alpha * sound.Samples[0][currentPitchPeriodSampleIndex]));
newSamples.Add(newSample);
}
// Next, add samples around the top of the current pitch period:
if (iPitchMark < (originalPitchMarkIndexList.Count - 1))
{
int nextModifiedPitchMarkIndexSpacing = modifiedPitchMarkIndexSpacingList[iPitchMark];
int currentTopEndIndex = currentPitchMarkIndex + (int)Math.Round(topFraction * nextModifiedPitchMarkIndexSpacing);
for (int ii = currentTopStartIndex; ii < currentTopEndIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
}
else // Special treatment of the final pitch period:
{
int endIndex = sound.Samples[0].Count;
for (int ii = currentTopStartIndex; ii < endIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
}
}
// Finally, build the sound from the new samples:
WAVSound newSound = new WAVSound(sound.Name, sound.SampleRate, sound.NumberOfChannels, sound.BitsPerSample);
newSound.GenerateFromSamples(new List <List <short> >()
{
newSamples, newSamples
});
return(newSound);
}
public void FindPitchMarks(WAVSound sound, SpeechTypeSpecification speechTypeSpecification, PitchPeriodSpecification pitchPeriodSpecification)
// , double peakSearchTimeRange,
// double adjustmentTimeRange, double relativePeakThreshold, double energyComputationTimeRange)
{
List <Tuple <int, int, SpeechType> > segmentTypeList = speechTypeSpecification.GetSegmentTypes();
List <int> absoluteSampleList = sound.GetAbsoluteSamples(0);
pitchMarkTimeList = new List <double>();
for (int iSegment = 0; iSegment < segmentTypeList.Count; iSegment++)
{
SpeechType segmentType = segmentTypeList[iSegment].Item3;
if (segmentType == SpeechType.Voiced)
{
int startIndex = segmentTypeList[iSegment].Item1;
int endIndex = segmentTypeList[iSegment].Item2;
double startTime = speechTypeSpecification.TimeSpeechTypeTupleList[startIndex].Item1;
double endTime = speechTypeSpecification.TimeSpeechTypeTupleList[endIndex].Item1;
int startSearchIndex = sound.GetSampleIndexAtTime(startTime);
int endSearchIndex = sound.GetSampleIndexAtTime(endTime);
int peakIndexSearchRange = (int)Math.Round(peakSearchTimeRange * sound.SampleRate);
int adjustmentIndexRange = (int)Math.Round(adjustmentTimeRange * sound.SampleRate);
int indexOfAbsoluteMaximum = sound.GetIndexOfAbsoluteMaximum(startSearchIndex, endSearchIndex);
int adjustedMainPitchMarkIndex = AdjustPitchMark(sound, indexOfAbsoluteMaximum, adjustmentIndexRange); // , relativePeakThreshold, energyComputationTimeRange);
double adjustedMainPitchMarkTime = sound.GetTimeAtSampleIndex(adjustedMainPitchMarkIndex);
pitchMarkTimeList.Add(adjustedMainPitchMarkTime);
Boolean inVoicedSegment = true;
double previousPitchMarkTime = adjustedMainPitchMarkTime;
// Next, move forward until the end of the voiced segment
while (inVoicedSegment)
{
double pitchPeriod = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = (int)Math.Round(pitchPeriod * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex + 2 * peakIndexSearchRange >= sound.Samples[0].Count)
{
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, adjustmentIndexRange); //, relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
// Make an incursion into the non-voiced segment
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
if (speechTypeSpecification.GetSpeechType(currentTime) != SpeechType.Voiced)
{
inVoicedSegment = false;
}
/* if (speechTypeSpecification.GetSpeechType(currentTime) == SpeechType.Voiced)
* {
* pitchMarkTimeList.Add(adjustedTime);
* previousPitchMarkTime = adjustedTime;
* }
* else { inVoicedSegment = false; } */
}
double voicedEndTime = pitchMarkTimeList.Last();
// Then continue half-way through any non-voiced segment followed by another voiced segment,
// or until the end of the sound if no voiced segment follows:
if (iSegment < segmentTypeList.Count)
{
double subsequenceVoicedSegmentStartTime = 0;
Boolean hasSubsequentVoicedSegment = false;
if (iSegment + 1 < segmentTypeList.Count)
{
for (int kk = iSegment + 1; kk < segmentTypeList.Count; kk++)
{
if (segmentTypeList[kk].Item3 == SpeechType.Voiced)
{
hasSubsequentVoicedSegment = true;
int startSegmentIndex = segmentTypeList[kk].Item1;
subsequenceVoicedSegmentStartTime = speechTypeSpecification.TimeSpeechTypeTupleList[startSegmentIndex].Item1;
break;
}
}
}
if (!hasSubsequentVoicedSegment)
{
// No following voiced segment: Just continue to the end
Boolean endReached = false;
while (!endReached)
{
double pitchPeriod = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = (int)Math.Round(pitchPeriod * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex + 2 * peakIndexSearchRange >= sound.Samples[0].Count)
{
endReached = true;
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, adjustmentIndexRange); //, relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
}
}
else // Proceed to the half-way mark of the interval from the end of the current voice segment to the beginning of the next.
{
double stopTime = voicedEndTime + (subsequenceVoicedSegmentStartTime - voicedEndTime) / 2;
int stopTimeIndex = sound.GetSampleIndexAtTime(stopTime);
Boolean endReached = false;
while (!endReached)
{
double pitchPeriod = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = (int)Math.Round(pitchPeriod * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex + 2 * peakIndexSearchRange >= stopTimeIndex)
{
endReached = true;
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, adjustmentIndexRange); // , relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
}
}
}
// Then move backward until the beginning of the voiced segment
inVoicedSegment = true;
previousPitchMarkTime = adjustedMainPitchMarkTime;
double voicedStartTime = 0;
while (inVoicedSegment)
{
double pitch = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = -(int)Math.Round(pitch * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex - 2 * peakIndexSearchRange < 0)
{
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, peakIndexSearchRange); // , relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
// Make an incursion into the non-voiced segment
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
if (speechTypeSpecification.GetSpeechType(currentTime) != SpeechType.Voiced)
{
inVoicedSegment = false;
voicedStartTime = adjustedTime;
}
}
// Then continue half-way through any non-voiced segment preceded by another voiced segment,
// or until the beginning of the sound if no voiced segment follows:
if (iSegment > 0)
{
double priorVoicedSegmentEndTime = 0;
Boolean hasPriorVoicedSegment = false;
if (iSegment - 1 > 0)
{
for (int kk = iSegment - 1; kk >= 0; kk--)
{
if (segmentTypeList[kk].Item3 == SpeechType.Voiced)
{
hasPriorVoicedSegment = true;
int endSegmentIndex = segmentTypeList[kk].Item2;
priorVoicedSegmentEndTime = speechTypeSpecification.TimeSpeechTypeTupleList[endSegmentIndex].Item1;
break;
}
}
}
if (!hasPriorVoicedSegment)
{
// No following voiced segment: Just continue to the end
Boolean endReached = false;
while (!endReached)
{
double pitchPeriod = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = -(int)Math.Round(pitchPeriod * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex - 2 * peakIndexSearchRange < 0)
{
endReached = true;
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, adjustmentIndexRange); // , relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
}
}
else // Proceed to the half-way mark of the interval from the end of the current voice segment to the beginning of the next.
{
double stopTime = voicedStartTime - (voicedStartTime - priorVoicedSegmentEndTime) / 2;
int stopTimeIndex = sound.GetSampleIndexAtTime(stopTime);
Boolean endReached = false;
while (!endReached)
{
double pitchPeriod = pitchPeriodSpecification.GetPitchPeriod(previousPitchMarkTime);
int deltaSample = -(int)Math.Round(pitchPeriod * sound.SampleRate);
int previousSampleIndex = sound.GetSampleIndexAtTime(previousPitchMarkTime);
int pitchSampleIndex = previousSampleIndex + deltaSample;
if (pitchSampleIndex - 2 * peakIndexSearchRange <= stopTimeIndex)
{
endReached = true;
break;
}
int currentSampleIndex = sound.GetIndexOfAbsoluteMaximum(pitchSampleIndex - peakIndexSearchRange, pitchSampleIndex + peakIndexSearchRange);
double currentTime = sound.GetTimeAtSampleIndex(currentSampleIndex);
int adjustedSampleIndex = AdjustPitchMark(sound, currentSampleIndex, adjustmentIndexRange); // , relativePeakThreshold, energyComputationTimeRange);
if (adjustedSampleIndex <= previousSampleIndex)
{
adjustedSampleIndex = currentSampleIndex; // Emergency fallback in cases where the search gets stuck (can happen if the pitch period is too small relative to the search range)
}
double adjustedTime = sound.GetTimeAtSampleIndex(adjustedSampleIndex);
pitchMarkTimeList.Add(adjustedTime);
previousPitchMarkTime = adjustedTime;
}
}
}
}
}
pitchMarkTimeList.Sort();
// Finally, remove any pitch marks that are too close (should only happen in non-voiced segments)
double minimumPitchPeriod = pitchPeriodSpecification.GetMinimumPitchPeriod();
int index = 1;
while (index < pitchMarkTimeList.Count)
{
double previousTime = pitchMarkTimeList[index - 1];
double currentTime = pitchMarkTimeList[index];
SpeechType previousSpeechType = speechTypeSpecification.GetSpeechType(previousTime);
SpeechType currentSpeechType = speechTypeSpecification.GetSpeechType(currentTime);
if ((previousSpeechType != SpeechType.Voiced) && (currentSpeechType != SpeechType.Voiced))
{
double deltaTime = currentTime - previousTime;
if (deltaTime < MINIMUM_UNVOICED_PITCHMARK_SPACING)
{
pitchMarkTimeList.RemoveAt(index);
}
else
{
index++;
}
}
else
{
index++;
}
}
}
// This method makes an approximation, namely that the pitch mark interval is roughly constant.
// Usually, this will give a duration accurate to a few per cent (sufficient!) relative to the desired duration.
public WAVSound ChangeDuration(WAVSound sound, List <double> pitchMarkTimeList, double relativeDuration)
{
/* List<double> pitchPeriodList = new List<double>();
* for (int ii = 1; ii < pitchMarkTimeList.Count; ii++)
* {
* double pitchPeriod = pitchMarkTimeList[ii] - pitchMarkTimeList[ii - 1];
* pitchPeriodList.Add(pitchPeriod);
* }
* double averagePitchPeriod = pitchPeriodList.Average(); */
List <short> newSamples = new List <short>();
int firstPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[0]);
for (int ii = 0; ii < firstPitchMarkIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
if (relativeDuration <= 1)
{
int removalStepInterval = (int)Math.Round(1 / (1 - relativeDuration));
int pitchIndex = 1;
while (pitchIndex < pitchMarkTimeList.Count)
{
if ((pitchIndex % removalStepInterval) == 0)
{
// Nothing to do here: Simply avoid adding these samples
}
else
{
int previousPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex - 1]);
int currentPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex]);
for (int ii = previousPitchMarkIndex; ii < currentPitchMarkIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
}
pitchIndex++;
}
}
else if (relativeDuration > 1)
{
int additionStepInterval = (int)Math.Round(1 / (relativeDuration - 1));
int pitchIndex = 1;
while (pitchIndex < pitchMarkTimeList.Count)
{
if ((pitchIndex % additionStepInterval) == 0)
{
// Insert the samples for this pitch period twice:
int previousPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex - 1]);
int currentPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex]);
for (int ii = previousPitchMarkIndex; ii < currentPitchMarkIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
for (int ii = previousPitchMarkIndex; ii < currentPitchMarkIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
}
else
{
int previousPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex - 1]);
int currentPitchMarkIndex = sound.GetSampleIndexAtTime(pitchMarkTimeList[pitchIndex]);
for (int ii = previousPitchMarkIndex; ii < currentPitchMarkIndex; ii++)
{
newSamples.Add(sound.Samples[0][ii]);
}
}
pitchIndex++;
}
}
// Finally, build the sound from the new samples:
WAVSound newSound = new WAVSound(sound.Name, sound.SampleRate, sound.NumberOfChannels, sound.BitsPerSample);
newSound.GenerateFromSamples(new List <List <short> >()
{
newSamples, newSamples
});
return(newSound);
}