private void ResetStream(bool hardReset)
{
if (position > byteMappings.Omega.To)
{
throw new Exception("position beyond length");
}
length = byteMappings.Omega.To;
byteMappings.SetWarpedPosition(position);
ByteTimeWarp mL = byteMappings.Lower;
ByteTimeWarp mH = byteMappings.Upper;
if (cropStream == null || cropStream.Begin != mL.From || cropStream.End != mH.From || resamplingStream.Length != byteMappings.Omega.To)
{
// mapping has changed, stream subsection must be renewed
if (hardReset)
{
// Each internal stream for each warped/resampled section works on the same underlying source stream, so
// we add the SourceClosePreventionStream to avoid the source being closed when an internally used stream
// of a section is disposed or closed (as in the call below). The source stream continues to get closed
// when this stream is closed.
cropStream = new CropStream(new SourceClosePreventionStream(sourceStream), mL.From, mH.From);
// Get rid of stream for previous section
if (resamplingStream != null)
{
resamplingStream.Close();
}
// Create stream for current section
resamplingStream = new ResamplingStream(cropStream, ResamplingQuality.VariableRate, ByteTimeWarp.CalculateSampleRateRatio(mL, mH));
resamplingStream.Position = position - mL.To;
}
else
{
// Reset the streams to the new conditions without creating new instances as the hard reset does
// NOTE always hard resetting works too, but this mode has been added to keep the sample resampler throughout playback
// Reset crop stream to source bounds, else the successive setting of begin and end can fail if
// the new begin position is after the old end position and the validation in the crop stream fails
cropStream.Begin = 0;
cropStream.End = sourceStream.Length;
// Reset the crop stream to the new bounds
cropStream.Begin = mL.From;
cropStream.End = mH.From;
cropStream.Position = 0;
// Reset the resampling stream
resamplingStream.SampleRateRatio = ByteTimeWarp.CalculateSampleRateRatio(mL, mH);
resamplingStream.Position = position - mL.To;
}
}
}
private void ResetStream(bool hardReset)
{
if (position > byteMappings.Omega.To)
{
throw new Exception("position beyond length");
}
length = byteMappings.Omega.To;
byteMappings.SetWarpedPosition(position);
ByteTimeWarp mL = byteMappings.Lower;
ByteTimeWarp mH = byteMappings.Upper;
if (cropStream == null || cropStream.Begin != mL.From || cropStream.End != mH.From || resamplingStream.Length != byteMappings.Omega.To)
{
// mapping has changed, stream subsection must be renewed
if (hardReset)
{
cropStream = new CropStream(sourceStream, mL.From, mH.From);
if (resamplingStream != null)
{
resamplingStream.Close();
}
resamplingStream = new ResamplingStream(cropStream, ResamplingQuality.VariableRate, ByteTimeWarp.CalculateSampleRateRatio(mL, mH));
resamplingStream.Position = position - mL.To;
}
else
{
// Reset the streams to the new conditions without creating new instances as the hard reset does
// NOTE always hard resetting works too, but this mode has been added to keep the sample resampler throughout playback
// Reset crop stream to source bounds, else the successive setting of begin and end can fail if
// the new begin position is after the old end position and the validation in the crop stream fails
cropStream.Begin = 0;
cropStream.End = sourceStream.Length;
// Reset the crop stream to the new bounds
cropStream.Begin = mL.From;
cropStream.End = mH.From;
cropStream.Position = 0;
// Reset the resampling stream
resamplingStream.SampleRateRatio = ByteTimeWarp.CalculateSampleRateRatio(mL, mH);
resamplingStream.Position = position - mL.To;
}
}
}
public void ValidateMappings()
{
// validate that no mapping is overlapping with another one
for (int x = 0; x < Count - 1; x++)
{
for (int y = x + 1; y < Count; y++)
{
if (this[x].To > this[y].To)
{
throw new Exception(this[x] + " is overlapping " + this[y]);
}
else if (!ResamplingStream.CheckSampleRateRatio(TimeWarp.CalculateSampleRateRatio(this[x], this[y])))
{
throw new Exception("invalid sample ratio: " + TimeWarp.CalculateSampleRateRatio(this[x], this[y]));
}
}
}
}