public MIDITrackChunk(byte[] arr)
{
if (Encoding.ASCII.GetString(arr.Take(4).ToArray()) != MIDITrackChunkType)
{
throw new Exception("Track Chunk Type is not " + MIDITrackChunkType);
}
Size = BitConverter.ToUInt32(arr.Skip(4).Take(4).Reverse().ToArray(), 0);
var toParse = 0;
while (toParse < Size)
{
var ev = new MTrkEvent(arr.Skip(8 + toParse).ToArray());
MTrkEvents.Add(ev);
toParse += ev.ToBytes().Length;
}
var firstEvent = (MIDIEvent)(MTrkEvents.Where(x => x.Event is MIDIEvent).Select(x => x.Event).FirstOrDefault());
if (firstEvent != null)
{
Channel = firstEvent.Channel;
}
}
public static void ParseTracks(string f, string outFile)
{
var lso = LSOFile.LSOFactory(f);
lso.ParseFile();
MIDIFile mf = new MIDIFile(lso.BPM);
foreach (var tempo in lso.GlobalTempo)
{
mf.TrackChunks[0].MTrkEvents.Add(new MTrkEvent((uint)(tempo.Timing / 2))
{
Event = new SetTempoMetaEvent((double)((double)tempo.Tempo / (double)10000))
});
}
foreach (var channel in lso.Channels)
{
var tracksInChannel = channel.Value.OrderBy(x => x.TrackPosition).ToList();
foreach (var track in tracksInChannel)
{
var Sequencer = new List <Sequence>();
MIDITrackChunk midiTrack = null;
midiTrack = new MIDITrackChunk(track.Channel, track.TrackName);
midiTrack.MTrkEvents.Add(new MTrkEvent(0)
{
Event = new ProgramChangeEvent(track.Channel, track.InitialInstrument)
});
int lastTime = 0;
// Check for track loop and duplicate until next track
if (track.IsLoopTrack && track.MIDIEvents.Count() > 0)
{
var trackIndex = tracksInChannel.IndexOf(track);
var isTrackLastOne = trackIndex == tracksInChannel.Count() - 1;
var stopLoopPosition = isTrackLastOne ? lso.SongLength : tracksInChannel[trackIndex + 1].TrackPosition;
// replicate track data until stop
var currentEvents = track.MIDIEvents.ToList();
var currentTime = track.TrackLength;
var currentMIDIEvent = currentEvents.First();
var totalMidiInCurrentEvents = currentEvents.Count() - 1;
var multiplier = 1;
for (int midiEventIndex = 0; currentTime < stopLoopPosition; midiEventIndex++)
{
currentMIDIEvent = currentEvents[midiEventIndex].Clone();
var eventNewTime = currentMIDIEvent.Position + (track.TrackLength * multiplier);
if (eventNewTime >= stopLoopPosition)
{
break;
}
currentMIDIEvent.Position = eventNewTime;
track.MIDIEvents.Add(currentMIDIEvent);
if (midiEventIndex == totalMidiInCurrentEvents)
{
multiplier++;
midiEventIndex = -1;
}
currentTime = eventNewTime;
}
}
foreach (var lme in track.MIDIEvents)
{
var del = track.TrackPosition + lme.Position;
if (lme.MIDIFirstByte == 0xB0)
{
// Instrument Change
Sequencer.Add(new Sequence()
{
eType = EvType.ControllerEvent,
MLE = lme,
Time = del,
Channel = (byte)track.Channel,
Note = lme.MIDISecondByte
});
continue;
}
if (lme.MIDIFirstByte == 0xC0)
{
// Instrument Change
Sequencer.Add(new Sequence()
{
eType = EvType.ProgramChangeEvent,
MLE = lme,
Time = del,
Channel = (byte)track.Channel,
Note = lme.MIDIThirdByte
});
continue;
}
if (lme.MIDIFirstByte == 0xE0)
{
// Pitch Bend
Sequencer.Add(new Sequence()
{
eType = EvType.PitchBend,
MLE = lme,
Time = del,
Channel = (byte)track.Channel,
Note = lme.MIDISecondByte,
ThirdByte = lme.MIDIThirdByte
});
continue;
}
// Note On
Sequencer.Add(new Sequence()
{
eType = EvType.NoteOn,
MLE = lme,
Time = del,
Channel = (byte)track.Channel,
Note = lme.MIDISecondByte
});
// Note Off
Sequencer.Add(new Sequence()
{
eType = EvType.NoteOff,
MLE = lme,
Time = del + lme.MIDILength,
Channel = (byte)track.Channel,
Note = lme.MIDISecondByte
});
}
Sequencer = Sequencer.OrderBy(x => x.Time).ToList();
// Add MIDI Events
foreach (var seq in Sequencer)
{
var delta = ((uint)(seq.Time - lastTime)) / 2;
MTrkEvent midiMtrkEvent = null;
switch (seq.eType)
{
case EvType.NoteOn:
midiMtrkEvent = new MTrkEvent(delta);
midiMtrkEvent.Event = new MIDIEventNoteOn(seq.Channel, seq.MLE.MIDISecondByte, seq.MLE.MIDIThirdByte);
midiTrack.MTrkEvents.Add(midiMtrkEvent);
break;
case EvType.NoteOff:
midiMtrkEvent = new MTrkEvent(delta);
midiMtrkEvent.Event = new MIDIEventNoteOn(seq.Channel, seq.MLE.MIDISecondByte, 0);
midiTrack.MTrkEvents.Add(midiMtrkEvent);
break;
case EvType.ProgramChangeEvent:
midiMtrkEvent = new MTrkEvent(delta);
midiMtrkEvent.Event = new ProgramChangeEvent(seq.Channel, seq.MLE.MIDIThirdByte);
midiTrack.MTrkEvents.Add(midiMtrkEvent);
break;
case EvType.PitchBend:
midiMtrkEvent = new MTrkEvent(delta);
midiMtrkEvent.Event = new PitchBendEvent(seq.Channel, seq.MLE.MIDIFirstByte, seq.MLE.MIDIThirdByte);
midiTrack.MTrkEvents.Add(midiMtrkEvent);
break;
case EvType.ControllerEvent:
midiMtrkEvent = new MTrkEvent(delta);
midiMtrkEvent.Event = new ControllerEvent(seq.Channel, seq.MLE.MIDISecondByte, seq.MLE.MIDIThirdByte);
midiTrack.MTrkEvents.Add(midiMtrkEvent);
break;
}
lastTime = seq.Time;
}
mf.TrackChunks.Add(midiTrack);
}
}
var midiFile = mf.ToBytes();
File.WriteAllBytes(outFile, midiFile);
}