private double SetEndOfTrack(int division, int previousNoteAbsoluteTicks, double percentageOfBarReached, MidiEvent midiEvent, StringBuilder lilypondContent)
{
if (previousNoteAbsoluteTicks > 0)
{
// Finish the last notelength.
double percentageOfBar;
lilypondContent.Append(MidiToLilyHelper.GetLilypondNoteLength(previousNoteAbsoluteTicks, midiEvent.AbsoluteTicks, division, _beatNote, _beatsPerBar, out percentageOfBar));
lilypondContent.Append(" ");
percentageOfBarReached += percentageOfBar;
if (percentageOfBarReached >= 1)
{
lilypondContent.AppendLine("|");
percentageOfBar = percentageOfBar - 1;
}
}
return(percentageOfBarReached);
}
/// <summary>
/// TODO: Create our own domain classes to be independent of external libraries/languages.
/// </summary>
/// <param name="sequence"></param>
/// <returns></returns>
public string LoadMidiIntoLilypond(Sequence sequence)
{
StringBuilder lilypondContent = new StringBuilder();
lilypondContent.AppendLine("\\relative c' {");
lilypondContent.AppendLine("\\clef treble");
int division = sequence.Division;
int previousMidiKey = 60; // Central C;
int previousNoteAbsoluteTicks = 0;
double percentageOfBarReached = 0;
bool startedNoteIsClosed = true;
for (int i = 0; i < sequence.Count(); i++)
{
Track track = sequence[i];
foreach (var midiEvent in track.Iterator())
{
IMidiMessage midiMessage = midiEvent.MidiMessage;
// TODO: Split this switch statements and create separate logic.
// We want to split this so that we can expand our functionality later with new keywords for example.
// Hint: Command pattern? Strategies? Factory method?
switch (midiMessage.MessageType)
{
case MessageType.Meta:
var metaMessage = midiMessage as MetaMessage;
switch (metaMessage.MetaType)
{
case MetaType.TimeSignature:
byte[] timeSignatureBytes = metaMessage.GetBytes();
_beatNote = timeSignatureBytes[0];
_beatsPerBar = (int)(1 / Math.Pow(timeSignatureBytes[1], -2));
lilypondContent.AppendLine($"\\time {_beatNote}/{_beatsPerBar}");
break;
case MetaType.Tempo:
byte[] tempoBytes = metaMessage.GetBytes();
int tempo = (tempoBytes[0] & 0xff) << 16 | (tempoBytes[1] & 0xff) << 8 | (tempoBytes[2] & 0xff);
_bpm = 60000000 / tempo;
lilypondContent.AppendLine($"\\tempo 4={_bpm}");
break;
case MetaType.EndOfTrack:
if (previousNoteAbsoluteTicks > 0)
{
// Finish the last notelength.
double percentageOfBar;
lilypondContent.Append(MidiToLilyHelper.GetLilypondNoteLength(previousNoteAbsoluteTicks, midiEvent.AbsoluteTicks, division, _beatNote, _beatsPerBar, out percentageOfBar));
lilypondContent.Append(" ");
percentageOfBarReached += percentageOfBar;
if (percentageOfBarReached >= 1)
{
lilypondContent.AppendLine("|");
percentageOfBar = percentageOfBar - 1;
}
}
break;
default: break;
}
break;
case MessageType.Channel:
var channelMessage = midiEvent.MidiMessage as ChannelMessage;
if (channelMessage.Command == ChannelCommand.NoteOn)
{
if (channelMessage.Data2 > 0) // Data2 = loudness
{
// Append the new note.
lilypondContent.Append(MidiToLilyHelper.GetLilyNoteName(previousMidiKey, channelMessage.Data1));
previousMidiKey = channelMessage.Data1;
startedNoteIsClosed = false;
}
else if (!startedNoteIsClosed)
{
// Finish the previous note with the length.
double percentageOfBar;
lilypondContent.Append(MidiToLilyHelper.GetLilypondNoteLength(previousNoteAbsoluteTicks, midiEvent.AbsoluteTicks, division, _beatNote, _beatsPerBar, out percentageOfBar));
previousNoteAbsoluteTicks = midiEvent.AbsoluteTicks;
lilypondContent.Append(" ");
percentageOfBarReached += percentageOfBar;
if (percentageOfBarReached >= 1)
{
lilypondContent.AppendLine("|");
percentageOfBarReached -= 1;
}
startedNoteIsClosed = true;
}
else
{
lilypondContent.Append("r");
}
}
break;
}
}
}
lilypondContent.Append("}");
return(lilypondContent.ToString());
}
private static void AppendNoteTone(StringBuilder lilypondContent, ref int previousMidiKey, ChannelMessage channelMessage)
{
lilypondContent.Append(MidiToLilyHelper.GetLilyNoteName(previousMidiKey, channelMessage.Data1));
previousMidiKey = channelMessage.Data1;
}
private void AppendNoteLength(StringBuilder lilypondContent, int division, ref int previousNoteAbsoluteTicks, ref double percentageOfBarReached, MidiEvent midiEvent, out double percentageOfBar)
{
lilypondContent.Append(MidiToLilyHelper.GetLilypondNoteLength(previousNoteAbsoluteTicks, midiEvent.AbsoluteTicks, division, _beatNote, _beatsPerBar, out percentageOfBar));
previousNoteAbsoluteTicks = midiEvent.AbsoluteTicks;
lilypondContent.Append(" ");
}