public override void SaveAsMIDI(string fileName)
{
if (NumTracks == 0)
{
throw new InvalidDataException("Questa canzone non ha tracce.");
}
CalculateTicks();
var midi = new Sequence(96)
{
Format = 1
};
var metaTrack = new Sanford.Multimedia.Midi.Track();
midi.Add(metaTrack);
for (int i = 0; i < NumTracks; i++)
{
var track = new Sanford.Multimedia.Midi.Track();
midi.Add(track);
FreeNoteCommand freeNote = null;
MidiEvent freeNoteOff = null;
for (int j = 0; j < Commands[i].Count; j++)
{
var e = Commands[i][j];
// Extended note ended ended and wasn't renewed
if (freeNoteOff != null && freeNoteOff.AbsoluteTicks < e.AbsoluteTicks * 2)
{
freeNote = null;
freeNoteOff = null;
}
if (e.Command is VolumeCommand vol)
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.Controller, i, (int)ControllerType.Volume, vol.Volume / 2));
}
else if (e.Command is VoiceCommand voice)
{
// TODO: Fork and remove restriction
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.ProgramChange, i, voice.Voice & 0x7F));
}
else if (e.Command is PanpotCommand pan)
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.Controller, i, (int)ControllerType.Pan, pan.Panpot / 2 + 0x40));
}
else if (e.Command is BendCommand bend)
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.PitchWheel, i, 0, bend.Bend / 2 + 0x40));
}
else if (e.Command is BendRangeCommand bendr)
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.Controller, i, 20, bendr.Range / 2));
}
else if (e.Command is MLSSNoteCommand note)
{
// Extended note is playing and it should be extended by this note
if (freeNote != null && freeNote.Note - 0x80 == note.Note)
{
// Move the note off command
track.Move(freeNoteOff, freeNoteOff.AbsoluteTicks + note.Duration * 2);
}
// Extended note is playing but this note is different OR there is no extended note playing
// Either way we play a new note and forget that one
else
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.NoteOn, i, note.Note, 0x7F));
track.Insert(e.AbsoluteTicks * 2 + note.Duration * 2, new ChannelMessage(ChannelCommand.NoteOff, i, note.Note));
freeNote = null;
freeNoteOff = null;
}
}
else if (e.Command is FreeNoteCommand free)
{
// Extended note is playing and it should be extended
if (freeNote != null && freeNote.Note == free.Note)
{
// Move the note off command
track.Move(freeNoteOff, freeNoteOff.AbsoluteTicks + free.Duration * 2);
}
// Extended note is playing but this note is different OR there is no extended note playing
// Either way we play a new note and forget that one
else
{
track.Insert(e.AbsoluteTicks * 2, new ChannelMessage(ChannelCommand.NoteOn, i, free.Note - 0x80, 0x7F));
track.Insert(e.AbsoluteTicks * 2 + free.Duration * 2, new ChannelMessage(ChannelCommand.NoteOff, i, free.Note - 0x80));
freeNote = free;
freeNoteOff = track.GetMidiEvent(track.Count - 2); // -1 would be the end of track event
}
}
else if (i == 0 && e.Command is TempoCommand tempo)
{
var change = new TempoChangeBuilder {
Tempo = (60000000 / tempo.Tempo)
};
change.Build();
metaTrack.Insert(e.AbsoluteTicks * 2, change.Result);
}
else if (i == 0 && e.Command is GoToCommand goTo)
{
int jumpCmd = Commands[i].FindIndex(c => c.GetOffset() == goTo.Offset);
metaTrack.Insert(Commands[i][jumpCmd].AbsoluteTicks * 2, new MetaMessage(MetaType.Marker, new byte[] { (byte)'[' }));
metaTrack.Insert(e.AbsoluteTicks * 2, new MetaMessage(MetaType.Marker, new byte[] { (byte)']' }));
}
else if (e.Command is FinishCommand fine)
{
// TODO: Fix ticks before end of track event
// Library automatically is updating track.EndOfTrackOffset for us
break;
}
}
}
midi.Save(fileName);
}
