public MusicSheet(string title, string instrument, MetronomeMark metronomeMark, IEnumerable <ChordOffset> melody)
{
MetronomeMark = metronomeMark;
Melody = melody;
Instrument = instrument;
Title = title;
}
public void Play(InstrumentType instrument, MetronomeMark metronomeMark, ChordOffset[] melody)
{
PrepareChordsOctave(instrument, melody[0].Chord);
var stopwatch = new Stopwatch();
stopwatch.Start();
for (var strumIndex = 0; strumIndex < melody.Length;)
{
var strum = melody[strumIndex];
if (stopwatch.ElapsedMilliseconds > metronomeMark.WholeNoteLength.Multiply(strum.Offest).TotalMilliseconds)
{
var chord = strum.Chord;
PlayChord(instrument, chord);
if (strumIndex < melody.Length - 1)
{
PrepareChordsOctave(instrument, melody[strumIndex + 1].Chord);
}
strumIndex++;
}
else
{
Thread.Sleep(TimeSpan.FromMilliseconds(1));
}
}
stopwatch.Stop();
}
public void Play(Harp harp, MetronomeMark metronomeMark, ChordOffset[] melody)
{
var stopwatch = new Stopwatch();
stopwatch.Start();
for (var strumIndex = 0; strumIndex < melody.Length;)
{
var strum = melody[strumIndex];
if (stopwatch.ElapsedMilliseconds > metronomeMark.WholeNoteLength.Multiply(strum.Offest).TotalMilliseconds)
{
var chord = strum.Chord;
foreach (var note in chord.Notes)
{
harp.GoToOctave(note);
harp.PlayNote(note);
}
strumIndex++;
}
else
{
Thread.Sleep(TimeSpan.FromMilliseconds(1));
}
}
stopwatch.Stop();
}
public MusicSheet Parse(string midiPath)
{
var midi = new MidiFile(midiPath);
var metronomeMark = new MetronomeMark(Metronome(midi), BeatsPerMeasure(midi));
return(new MusicSheet(Path.GetFileNameWithoutExtension(midiPath), metronomeMark, Melody(midi, metronomeMark)));
}
private static Beat Offset(long absoluteTime, MetronomeMark metronomeMark)
{
decimal
time = absoluteTime,
wholeNoteLength = (decimal)metronomeMark.WholeNoteLength.TotalMilliseconds;
var beatsPerMeasure = metronomeMark.BeatsPerMeasure;
return(new Beat(time / wholeNoteLength / beatsPerMeasure));
}
private static IEnumerable <ChordOffset> Melody(MidiFile midi, MetronomeMark metronomeMark)
{
return(midi.Events
.SelectMany(@event => @event)
.OfType <NoteOnEvent>()
.Where(MidiEvent.IsNoteOn)
.Where(note => note.NoteNumber >= MidiNoteC3 && note.NoteNumber <= MidiNoteC6)
.GroupBy(@event => @event.AbsoluteTime)
.OrderBy(group => group.Key)
.Select(x => ChordOffset(x, metronomeMark)));
}
private static ChordOffset ChordOffset(IGrouping <long, NoteOnEvent> midiEvents, MetronomeMark metronomeMark)
{
return(new ChordOffset(Chord(midiEvents), Offset(midiEvents.Key, metronomeMark)));
}
public void it_calculates_length(int metronome, int nominator, int denominator, string expected)
{
var metronomeMark = new MetronomeMark(metronome, new Fraction(nominator, denominator));
Assert.That(metronomeMark.WholeNoteLength, Is.EqualTo(TimeSpan.Parse(expected)));
}
