public static Composition Read(string filename, Fraction?prec = null)
{
var reader = new StreamReader(filename);
MelodyPartList list = new MelodyPartList(MelodyPartList.Type.Voice);
while (!reader.EndOfStream)
{
string line = reader.ReadLine();
if (line == "")
{
continue;
}
var values = line.Split(',');
if (values.Length != 2)
{
throw new Exception($"The line `{line}` must contain exactly two values.");
}
int note = int.Parse(values[0].Trim());
Fraction duration = Fraction.Parse(values[1].Trim());
NoteWithDuration nwd = new NoteWithDuration(60 + note, duration);
list.Add(nwd);
}
Composition composition = new Composition();
composition.millisecondsPerNote = 500; // todo: arbitrary tempo
composition.AddVoice(list);
return(composition);
}
public static Composition Read(string filename)
{
MidiFile midi = new MidiFile(filename, true);
Composition composition = new Composition();
for (int track = 0; track < midi.Tracks; track++)
{
MelodyPartList list = new MelodyPartList(MelodyPartList.Type.Voice);
foreach (MidiEvent midievent in midi.Events[track])
{
if (midievent is NoteOnEvent noteonevent)
{
if (noteonevent.OffEvent != null)
{
if (noteonevent.DeltaTime > 0)
{
list.Add(new NoteWithDuration(new Fraction(noteonevent.DeltaTime, 120)));
}
list.Add(
new NoteWithDuration(
noteonevent.NoteNumber,
Alteration.Natural,
new Fraction(noteonevent.NoteLength, 120)));
}
}
else
{
}
}
if (list.Count > 0)
{
composition.AddVoice(list);
}
}
return(composition);
}
private static void AddNote(MelodyPartList list, NoteWithDuration nwd, Fraction?prec = null, long absoluteTime = 0)
{
if (prec != null)
{
Fraction times = (nwd.Duration / prec.Value);
if (!times.IsWhole())
{
throw new Exception($"Duration of Note {nwd} not divisible by {prec.Value} at absoluteTime={absoluteTime}");
}
}
list.Add(nwd);
}