public MidiEventCollection UpdatePpq(MidiEventCollection midi, int newPpq)
{
var newMidi = new MidiEventCollection(midi.MidiFileType, newPpq);
var multiplier = (double)newPpq / midi.DeltaTicksPerQuarterNote;
for (var track = 0; track < midi.Tracks; track++)
{
var newTrack = newMidi.AddTrackCopy(midi[track]);
var shifted = new HashSet <MidiEvent>();
foreach (var clonedEvent in newTrack)
{
if (shifted.Add(clonedEvent))
{
clonedEvent.AbsoluteTime = (long)(clonedEvent.AbsoluteTime * multiplier);
}
// Make sure that we shift the off event whether it is in the track or not.
var offEvent = (clonedEvent as NoteOnEvent)?.OffEvent;
if (offEvent != null && shifted.Add(offEvent))
{
offEvent.AbsoluteTime = (long)(offEvent.AbsoluteTime * multiplier);
}
}
}
return(newMidi);
}
public void TestAddTrackCopyParams()
{
var manualMidi = new MidiEventCollection(1, 200);
var noteEvent = new NoteOnEvent(0, 1, 1, 1, 1);
var track = manualMidi.AddTrack();
track.Add(noteEvent);
track.Add(noteEvent.OffEvent);
var extensionMidi = new MidiEventCollection(1, 200);
extensionMidi.AddTrackCopy(noteEvent, noteEvent.OffEvent);
MidiAssert.Equal(manualMidi, extensionMidi);
// Assert they aren't the same objects
var manualTrack = manualMidi[0];
var extensionTrack = extensionMidi[0];
for (var e = 0; e < manualTrack.Count; e++)
{
Assert.That(extensionTrack[e], Is.Not.SameAs(manualTrack[e]));
}
// Verify the NoteOnEvent.OffEvent link
Assert.AreEqual(extensionMidi[0][1], ((NoteOnEvent)extensionMidi[0][0]).OffEvent);
}
public void TestAddTrackCopyDuplicateEvents()
{
var noteEvent = new NoteOnEvent(0, 1, 1, 1, 1);
var extensionMidi = new MidiEventCollection(1, 200);
var events = new MidiEvent[] { noteEvent, noteEvent.OffEvent, noteEvent, noteEvent.OffEvent };
Assert.Throws <ArgumentException>(() => extensionMidi.AddTrackCopy(events));
}
public static MidiEventCollection Clone(this MidiEventCollection original)
{
var newCollection = new MidiEventCollection(original.MidiFileType, original.DeltaTicksPerQuarterNote);
for (var i = 0; i < original.Tracks; i++)
{
newCollection.AddTrackCopy(original[i]);
}
return(newCollection);
}
public static IList <MidiEvent> AddTrackCopy(this MidiEventCollection midiEventCollection, params MidiEvent[] initialEvents)
{
return(midiEventCollection.AddTrackCopy((IList <MidiEvent>)initialEvents));
}
