/// <summary>
/// <see cref="GroorineFile"/> の新しいインスタンスを初期化します。
/// </summary>
/// <param name="ct"></param>
/// <param name="tracks"></param>
/// <param name="resolution"></param>
/// <param name="title"></param>
/// <param name="copyright"></param>
internal GroorineFile(ConductorTrack ct, ObservableCollection <Track> tracks, short resolution, string title, string copyright, long?loopStart = null)
{
Tracks = tracks;
foreach (Track t in tracks)
{
foreach (NoteEvent ne in t.Events.OfType <NoteEvent>().Where(e => e.Channel == 9 && e.Gate < resolution))
{
ne.Gate = resolution;
}
}
Resolution = resolution;
Title = title;
Copyright = copyright;
Conductor = ct;
LoopStart = loopStart;
if (Tracks?.Count > 0)
{
Length = Tracks.Max(mt => mt.Length);
}
}
public MidiFile Generate(int size)
{
var ct = new ConductorTrack(new ObservableCollection <MetaEvent>(new List <TempoEvent>()
{
new TempoEvent {
Tempo = bpmCandidates.Random()
}
}), 480);
var tracks = new ObservableCollection <Track>();
var drumIsAvailable = Extension.Random(10) < 5;
var channels = Extension.Random(1, 17);
if (units == null)
{
return(null);
}
for (int ch = 0; ch < channels; ch++)
{
var events = new ObservableCollection <MidiEvent>();
if (units[ch] == null)
{
continue;
}
events.Add(new ProgramEvent {
Channel = (byte)ch, ProgramNo = (byte)pcCandidates[ch].Random()
});
var unit = startUnitCandidates[ch].Random();
unit = unit ?? units[ch].ToList().Random().Value.Random();
if (unit == default)
{
continue;
}
var currentTick = 0L;
for (int i = 0; i < size; i++)
{
if (unit.Notes.Length == 0)
{
break;
}
foreach (var note in unit.Notes)
{
events.Add(new NoteEvent {
Note = note.Note, Gate = note.Gate, Velocity = note.Velocity, Channel = note.Channel, Tick = currentTick
});
}
// 候補がなくなったら終了
if (unit.Candidates.Count == 0)
{
break;
}
unit = units[ch][unit.Candidates.Random()].Random();
currentTick += unit.Notes[0].Gate + unit.Notes[0].Wait;
}
events.Add(new EndOfTrackEvent {
Channel = (byte)ch, Tick = currentTick
});
tracks.Add(new Track(events));
}
// チャンネル数がドラムパートに届かなかった場合50%でドラムが入る
if (channels < 9 && drumIsAvailable && units[9] != null && units[9].Count > 0)
{
var events = new ObservableCollection <MidiEvent>();
var unit = units[9].ToList().Random().Value?.Random();
var currentTick = 0L;
for (int i = 0; i < size; i++)
{
if (unit.Notes.Length == 0)
{
continue;
}
foreach (var note in unit.Notes)
{
events.Add(new NoteEvent {
Note = note.Note, Gate = note.Gate, Velocity = note.Velocity, Channel = note.Channel, Tick = currentTick
});
}
// 候補がなくなったら終了
if (unit.Candidates.Count == 0)
{
break;
}
unit = units[9][unit.Candidates.Random()].Random();
currentTick += unit.Notes[0].Gate + unit.Notes[0].Wait;
}
tracks.Add(new Track(events));
}
return(new MidiFile(ct, tracks, 480, $"AI Generated Song {DateTime.Now.ToString()}", ""));
}