public static string NormalizeTicksPerQuarterNote(string base64encodedMidiFile)
{
int standardTicksPerQuarterNote = 96;
var midiFile = MidiFile.Read(base64encodedMidiFile);
midiFile = ConvertDeltaTimeToAccumulatedTime(midiFile);
var originalTicksPerQuarterNote = MidiProcessing.GetTicksPerBeatOfSong(base64encodedMidiFile);
double conversionRate = standardTicksPerQuarterNote / (double)originalTicksPerQuarterNote;
foreach (TrackChunk chunk in midiFile.Chunks)
{
foreach (var eventito in chunk.Events)
{
eventito.DeltaTime = (long)Math.Round(conversionRate * eventito.DeltaTime);
}
}
midiFile = ConvertAccumulatedTimeToDeltaTime(midiFile);
return(MidiProcessing.ConvertMidiFileToBase64encodedMidiFile(midiFile));
}
public static string GetMidiFromNotes(Song song, int songVersion)
{
var standardTicksPerQuarterNote = 96;
var mf = new MidiFile();
mf.TimeDivision = new TicksPerQuarterNoteTimeDivision((short)standardTicksPerQuarterNote);
var chunkitos = new Dictionary <GeneralMidi2Program, TrackChunk>();
TrackChunk percusionChunk = null;
var instrumentsChannels = new Dictionary <GeneralMidi2Program, byte>();
foreach (var n in song.Versions[songVersion].Notes.OrderBy(n => n.StartSinceBeginningOfSongInTicks))
{
if (n.IsPercussion)
{
if (percusionChunk == null)
{
percusionChunk = new TrackChunk();
}
percusionChunk = AddEventsOfNote(percusionChunk, n, 9);
}
else
{
if (!chunkitos.Keys.Contains(n.Instrument))
{
chunkitos[n.Instrument] = new TrackChunk();
}
if (!(instrumentsChannels.Keys).ToList().Contains(n.Instrument))
{
byte channel = GetFreeChannelForNote(song, instrumentsChannels, n, songVersion);
instrumentsChannels[n.Instrument] = channel;
chunkitos[n.Instrument] = AddProgramChangeEventToChunk(chunkitos[n.Instrument], channel,
n.StartSinceBeginningOfSongInTicks, (byte)n.Instrument);
}
chunkitos[n.Instrument] = AddEventsOfNote(chunkitos[n.Instrument], n, instrumentsChannels[n.Instrument]);
}
}
var channelIndependentChunkito = new TrackChunk();
channelIndependentChunkito = AddSetTempoEvents(channelIndependentChunkito, song.TempoChanges);
var allChunks = chunkitos.Values.ToList();
if (percusionChunk != null)
{
allChunks.Add(percusionChunk);
}
if (channelIndependentChunkito.Events._events.Count > 0)
{
allChunks.Add(channelIndependentChunkito);
}
foreach (var chunky in allChunks)
{
chunky.Events._events = MidiProcessing.ConvertAccumulatedTimeToDeltaTime(chunky.Events.OrderBy(x => x.DeltaTime).ToList());
mf.Chunks.Add(chunky);
}
using (MemoryStream memStream = new MemoryStream(1000000))
{
mf.Write(memStream);
var bytes = memStream.ToArray();
return(Convert.ToBase64String(bytes));
}
}
