private long GetTempo(MidiFile midiFile)
{
TempoMap tempoMap = midiFile.GetTempoMap();
long ticks = 123;
BarBeatTimeSpan barBeatTimeSpan = TimeConverter.ConvertTo <BarBeatTimeSpan>(ticks, tempoMap);
MusicalTimeSpan musicalTimeSpan = TimeConverter.ConvertTo <MusicalTimeSpan>(ticks, tempoMap);
return(barBeatTimeSpan.Bars);
}
public float MBTToBeats(Mbt mbt)
{
if (!_HasMidiFile())
{
return(mbt.beat * 4);
}
BarBeatTimeSpan inputSpan = new BarBeatTimeSpan(mbt.measure, mbt.beat, mbt.tick);
BeatTimeSpan outputSpan = TimeConverter.ConvertTo <BeatTimeSpan>(inputSpan, _tempoMap);
float resultBeats = (float)outputSpan.Beats + ((float)outputSpan.Ticks / _TicksPerBeat());
return(resultBeats);
}
public Mbt BeatsToMBT(float beat)
{
if (!_HasMidiFile())
{
return(new Mbt(0, (int)beat, 0));
}
float frac = beat % 1.0f;
int beats = (int)beat;
int ticks = (int)(frac * _TicksPerBeat());
BeatTimeSpan inputSpan = new BeatTimeSpan(beats, ticks);
BarBeatTimeSpan outputSpan = TimeConverter.ConvertTo <BarBeatTimeSpan>(inputSpan, _tempoMap);
return(new Mbt((int)outputSpan.Bars, (int)outputSpan.Beats, (int)outputSpan.Ticks));
}
static void Main(string[] args)
{
IEnumerable <string> globFiles = GlobClass.Glob("D:\\data\\folkdataset\\*.mid");
Console.Write(globFiles.LongCount());
var count = 0;
foreach (string filename in globFiles)
{
var split_filename = filename.Split('\\');
var id_filename = split_filename[split_filename.Count() - 1];
var midiFile = MidiFile.Read(filename);
var result = new List <MidiFile>();
var windowSize = 4;
for (var i = 0; ; i++)
{
var startTime = new BarBeatTimeSpan(i, 0);
var endTime = new BarBeatTimeSpan(i + windowSize, 0);
var grid = new ArbitraryGrid(new[] { startTime, endTime });
var newFiles = midiFile.SplitByGrid(grid).ToList();
if (!newFiles.Any())
{
break;
}
else if (newFiles.Count == 1)
{
result.Add(newFiles[0]);
}
else
{
var secondNewFile = newFiles[1];
var tempoMap = secondNewFile.GetTempoMap();
var length = secondNewFile.GetTimedEvents().LastOrDefault()?.TimeAs <BarBeatTimeSpan>(tempoMap);
if (length.Bars == windowSize || (length.Bars == windowSize - 1 && length.Beats > 0 && length.Ticks > 0))
{
result.Add(secondNewFile);
}
else
{
break;
}
}
}
int j = 0;
foreach (MidiFile res in result)
{
res.Write("D:\\data\\folkdataset_split_4\\" + id_filename + "_" + j + ".mid");
j += 1;
count++;
}
// TODO
if (count >= 10000)
{
Console.WriteLine("Reached the alloted size");
return;
}
}
}
