public ILength ConvertTo(long length, long time, TempoMap tempoMap)
{
ThrowIfLengthArgument.IsNegative(nameof(length), length);
ThrowIfTimeArgument.IsNegative(nameof(time), time);
ThrowIfArgument.IsNull(nameof(tempoMap), tempoMap);
var ticksPerQuarterNoteTimeDivision = tempoMap.TimeDivision as TicksPerQuarterNoteTimeDivision;
if (ticksPerQuarterNoteTimeDivision != null)
{
return(new MusicalLength(FractionUtilities.FromTicks(length, ticksPerQuarterNoteTimeDivision.TicksPerQuarterNote)));
}
ThrowIfTimeDivision.IsNotSupportedForLengthConversion(tempoMap.TimeDivision);
return(null);
}
private static MusicalTime ConvertToByTicksPerQuarterNote(long time, short ticksPerQuarterNote, TempoMap tempoMap)
{
ThrowIfTimeArgument.IsNegative(nameof(time), time);
ThrowIfArgument.IsNull(nameof(tempoMap), tempoMap);
//
var bars = 0;
var lastTime = 0L;
var lastTimeSignature = TimeSignature.Default;
foreach (var timeSignatureChange in tempoMap.TimeSignature.Values.Where(v => v.Time <= time))
{
var timeSignatureChangeTime = timeSignatureChange.Time;
bars += GetBarsCount(timeSignatureChangeTime - lastTime, lastTimeSignature, ticksPerQuarterNote);
lastTimeSignature = timeSignatureChange.Value;
lastTime = timeSignatureChangeTime;
}
//
var deltaTime = time - lastTime;
var lastBars = GetBarsCount(deltaTime, lastTimeSignature, ticksPerQuarterNote);
bars += lastBars;
//
deltaTime = deltaTime % GetBarLength(lastTimeSignature, ticksPerQuarterNote);
var beatLength = GetBeatLength(lastTimeSignature, ticksPerQuarterNote);
var beats = deltaTime / beatLength;
//
var fraction = FractionUtilities.FromTicks(deltaTime % beatLength, ticksPerQuarterNote);
//
return(new MusicalTime(bars, (int)beats, fraction));
}
