private void cutMusic(int from, int to, MidiMusic music, string outputFilename)
{
FileStream stream = File.Create(outputFilename);
SmfWriter writer = new SmfWriter(stream);
writer.WriteHeader(music.Format, (short)music.Tracks.Count, music.DeltaTimeSpec);
IList <MidiTrack> tracks = music.Tracks;
for (var i = 0; i < tracks.Count; i++)
{
var track = tracks[i];
int passedTime = 0;
var newTrack = new MidiTrack();
bool isFirstMessage = true;
for (var j = 0; j < track.Messages.Count; j++)
{
var message = track.Messages[j];
passedTime += message.DeltaTime;
if (passedTime < from && message.Event.EventType != MidiEvent.NoteOn && message.Event.EventType != MidiEvent.NoteOff)
{
var convertedMsg = MidiUtil.convertTimeToZero(message);
newTrack.AddMessage(convertedMsg);
}
else if (passedTime >= from && passedTime < to)
{
if (isFirstMessage)
{
int newDeltaTime = passedTime - from;
newTrack.AddMessage(new MidiMessage(newDeltaTime, message.Event));
isFirstMessage = false;
}
else
{
newTrack.AddMessage(message);
}
}
else if (passedTime >= to && message.Event.EventType == MidiEvent.Meta && message.Event.MetaType == MidiMetaType.EndOfTrack)
{
MidiMessage convertedMsg = MidiUtil.convertTimeToZero(message);
newTrack.AddMessage(convertedMsg);
}
}
track = newTrack;
// Debug.Log("Track " + (i + 1) + " Passed time:" + passedTime);
writer.WriteTrack(track);
}
stream.Close();
}
/// <summary>
/// Writes tracks to specified file
/// </summary>
/// <param name="outputFileName">Name of the destination file</param>
/// <param name="tracks">Tracks to write</param>
public void writeTracksToFile(IList <MidiTrack> tracks, string outputFileName)
{
foreach (MidiTrack midiTrack in tracks)
{
FileStream stream = this.createFile(outputFileName);
SmfWriter writer = new SmfWriter(stream);
writer.WriteHeader(music.Format, (short)tracks.Count(), music.DeltaTimeSpec);
foreach (MidiTrack track in tracks)
{
writer.WriteTrack(track);
}
stream.Close();
}
}