public void AddVenueTrack(MidiEventCollection midi)
{
var existingTrack = midi.FindTrackNumberByName(TrackName.Venue.ToString());
if (existingTrack != -1)
{
return;
}
midi.AddNamedTrack(TrackName.Venue.ToString());
}
public static MidiEventCollection ReorderTracks(MidiEventCollection midi)
{
var newMidi = new MidiEventCollection(midi.MidiFileType, midi.DeltaTicksPerQuarterNote);
var tempoMapIndex = midi.FindTrackNumberByName(TrackName.TempoMap.ToString());
newMidi.AddTrack(midi[tempoMapIndex]);
for (var t = 0; t < midi.Tracks; t++)
{
if (t != tempoMapIndex)
{
newMidi.AddTrack(midi[t]);
}
}
return(newMidi);
}
public void ProcessTimeSignatures(MidiEventCollection midi)
{
// This is way easier if these have already been consolidated
ConsolidateTimeTracks(midi);
var timeSigTrackNo = midi.FindTrackNumberByName(TrackName.InputTimeSig.ToString());
if (timeSigTrackNo == -1)
{
AddInfo($"No '{TrackName.InputTimeSig}' track");
return;
}
var timeEvents = midi[midi.FindTrackNumberByName(TrackName.TempoMap.ToString())];
var inputTimeSignatureEvents = midi[timeSigTrackNo].OfType <NoteOnEvent>();
var groups = inputTimeSignatureEvents.GroupBy(e => e.AbsoluteTime);
var error = false;
foreach (var pair in groups)
{
var time = pair.Key;
// The higher velocity value is the numerator (top)
// And the lower velocity value is the denominator (bottom)
var sorted = pair.OrderByDescending(e => e.Velocity).ToArray();
if (sorted.Length != 2)
{
error = true;
var detail = string.Join(", ", sorted.Select(e => $"<{e.NoteName} ({e.NoteNumber}), Velocity: {e.Velocity}>"));
AddError($"Incorrect number of time signature notes at {GetBarInfo(midi, time)}: {detail}");
continue;
}
if (sorted[0].Velocity == sorted[1].Velocity)
{
error = true;
var detail = string.Join(", ", sorted.Select(e => $"<{e.NoteName} ({e.NoteNumber}), Velocity: {e.Velocity}>"));
AddError($"Multiple notes with the same velocity at {GetBarInfo(midi, time)}: {detail}");
continue;
}
var numerator = sorted[0].NoteNumber;
int denominator;
if (!TryConvertToDenominator(sorted[1].NoteNumber, out denominator))
{
error = true;
AddError($"Invalid denominator note '{sorted[1].NoteNumber}' at {time}");
continue;
}
var timeSigEvent = new TimeSignatureEvent(time, numerator, denominator, TicksInClick, NumberOfThirtySecondNotesInQuarterNote);
var existingTimeSigEvent = timeEvents.OfType <TimeSignatureEvent>().SingleOrDefault(e => e.AbsoluteTime == time);
if (existingTimeSigEvent != null)
{
timeEvents.Remove(existingTimeSigEvent);
}
timeEvents.Add(timeSigEvent);
}
if (error)
{
throw new InvalidOperationException("Invalid time signature input");
}
// Clean up input track
midi.RemoveTrack(timeSigTrackNo);
UpdateTrackEnd(timeEvents, timeEvents.OrderBy(e => e.AbsoluteTime).Last().AbsoluteTime);
// TODO: If there is no TimeSignatureEvent or TempoEvent at 0, wig out
}
