public void ConstrainNotesToMeasureBoundaries()
{
foreach (var note in this.Notes)
{
//get start and end boundary points for this note
MidiTime startOfBar = new MidiTime(this.File, note.AveragePosition.Measures, 1, 0, this.TimeSignature);
MidiTime endOfBar = new MidiTime(this.File, note.AveragePosition.Measures + 1, 1, 0, this.TimeSignature);
if (note.StartPosition.GetAsTotalTicks() < startOfBar.GetAsTotalTicks())
{
//note is mostly in current bar but the note starts just before the bar start.
//Move the note start to the to start of the measure
note.StartPosition = new MidiTime(startOfBar);
note.CalculateEndPosition();
}
else if (note.EndPosition.GetAsTotalTicks() > endOfBar.GetAsTotalTicks())
{
///note is mostly in current bar but the note ends just after the bar end.
///Shorten the length of the note.
///This will only rarely happen because at this point the note lengths are 1 and so arent long enough to span two measures
note.Length = endOfBar.GetAsTotalTicks() - note.StartPosition.GetAsTotalTicks();
note.CalculateEndPosition();
}
}
}
public MidiTime(MidiTime copyMe)
{
this.File = copyMe.File;
this.TimeSignature = copyMe.TimeSignature;
this.Measures = copyMe.Measures;
this.Beats = copyMe.Beats;
this.Ticks = copyMe.Ticks;
this.Region = copyMe.Region;
}
/// <summary>
/// the position of the region boundaries are calculated on the fly by using the current time
/// signature and pulses per QN
/// </summary>
/// <param name="position"></param>
/// <param name="pulsesPerQuarterNote"></param>
/// <param name="timeSig"></param>
/// <returns></returns>
public Region GetRegion(MidiTime position, uint pulsesPerQuarterNote, TimeSignatureEvent timeSig)
{
uint posTicks = position.GetAsTotalTicks(pulsesPerQuarterNote, timeSig);
foreach (Region r in this.Regions)
{
if (posTicks >= r.Start.GetAsTotalTicks(pulsesPerQuarterNote, timeSig) &&
posTicks < r.End.GetAsTotalTicks(pulsesPerQuarterNote, timeSig))
{
return(r);
}
}
return(null);
}
public void ConvertToMidiFilesByRegionAndBarAndTrack(String outputPath)
{
if (this.Header.FormatType != TrackFormatType.MetaAndChannel)
{
throw new ApplicationException("cannot split file");
}
List <MidiFile> midiFiles = new List <MidiFile>();
foreach (TrackChunk origTrack in this.Tracks)
{
/// do conversion in this order. by doing these conversions we also remove any
/// overlapping notes.
origTrack.MakeAllNotesSameKey(48); //good for drums where we want the same note for all drum hits
origTrack.MakeAllNotesSameLength(10); //smallest unit that wont overlap after cleaning duplicates
//origTrack.ConstrainNotesToMeasureBoundaries(); //makes it easy to put the notes into 'measure' files
//origTrack.RemoveNotesNotInMeasure();
origTrack.RemoveNotesWhereNoteStartIsNotWithinMeasure();
//origTrack.RemoveDuplicateNotes();
origTrack.RemoveDuplicateNotes();
//uint currentMeasure = 0;
uint currentRegionMeasure = 0;
TrackChunk newTrack = null;
MidiFile newFile = null;
Region currentRegion = null;
MidiTime currentMeasureStart = null;
Note lastNote = null;
foreach (var note in origTrack.Notes)
{
if (note.StartPosition.Region == null)
{
Debug.WriteLine(origTrack.TrackName.Text + " null region @" + note.StartPosition);
//Debug.WriteLine(note.ToString());
continue;
}
if (note.StartPosition.Region != currentRegion)
{
///the first note in a new region
///
currentRegion = note.StartPosition.Region;
currentRegionMeasure = 0; //reset
}
if (currentMeasureStart == null || note.StartPosition.Measures != currentMeasureStart.Measures)
{
currentRegionMeasure++;
///the first note in a new measure
///
newFile = new MidiFile();
String temp = origTrack.TrackName.Text.Substring(0, 2);
//if (temp.StartsWith("0"))
// temp = temp.Substring(1);
String newTrackName = note.StartPosition.Region.ID + "-B" + currentRegionMeasure + "-T" + temp;
newFile.FileNameAndPath = outputPath + Path.DirectorySeparatorChar + newTrackName + ".mid";
newFile.Header.NumberOfTracks = 1;
newFile.Header.FormatType = TrackFormatType.Single;
newFile.Header.PulsesPerQuarterNote = this.Header.PulsesPerQuarterNote;
midiFiles.Add(newFile);
newTrack = new TrackChunk();
newTrack.TrackName = new TrackNameEvent(newTrackName);
newTrack.TimeSignature = new TimeSignatureEvent(origTrack.TimeSignature.Numerator, origTrack.TimeSignature.Denominator, origTrack.TimeSignature.MetronomePulse, origTrack.TimeSignature.ThirtySecondNotes);
newTrack.Tempo = new TempoEvent(origTrack.Tempo.MicroSecondsPerQuarterNote, origTrack.TimeSignature.Denominator);
newTrack.CopyrightNotice = new CopyrightNoticeEvent("Joe Bacon 2013");
newTrack.DeviceName = new DeviceNameEvent("MIDI-Bacon");
newFile.Tracks.Add(newTrack);
currentMeasureStart = new MidiTime(this, note.StartPosition.Measures, 1, 0, origTrack.TimeSignature);
lastNote = null;
}
uint deltaTime = 0;
if (lastNote == null)
{
deltaTime = note.StartPosition.GetAsTotalTicks() - currentMeasureStart.GetAsTotalTicks(); //occurs on first note of measure
}
else
{
deltaTime = note.StartPosition.GetAsTotalTicks() - lastNote.EndPosition.GetAsTotalTicks();
}
ChannelMidiEvent noteOnEvent = ChannelMidiEvent.CreateNoteOnChannelMidiEvent(0, note.NoteNumber, note.Velocity, deltaTime);
newTrack.ChannelEvents.Add(noteOnEvent);
ChannelMidiEvent noteOffEvent = ChannelMidiEvent.CreateNoteOffChannelMidiEvent(0, note.NoteNumber, note.Length);
newTrack.ChannelEvents.Add(noteOffEvent);
lastNote = note;
}
}
foreach (MidiFile mf in midiFiles)
{
mf.Export(mf.FileNameAndPath);
}
}
