public void Play(List <Note> song, int key, List <int> chords)
{
lock (playingLock)
{
if (isCurrentlyPlaying)
{
return;
}
isCurrentlyPlaying = true;
stopPlayback = false;
List <Note> copyOfSong = new List <Note>(song);
List <int> copyOfChords = new List <int>(chords);
SongAndChords param = new SongAndChords()
{
Song = copyOfSong, Key = key, Chords = copyOfChords
};
playingThread = new Thread(new ParameterizedThreadStart(DoPlay));
playingThread.Start(param);
}
}
private void DoPlay(object objSong)
{
SongAndChords param = (SongAndChords)objSong;
List <Note> song = (List <Note>)param.Song;
int[] chords = param.Chords.ToArray();
int key = param.Key;
int currentSongPos = 0;
int lastChordOn = 0;
using (OutputDevice outDevice = new OutputDevice(0))
{
ChannelMessageBuilder builder = new ChannelMessageBuilder();
// turn first chord on
Note(true, key + chords[0], builder, outDevice);
lastChordOn = key + Scales.Major[chords[0]];
foreach (Note n in song)
{
lock (playingLock)
{
if (stopPlayback)
{
break;
}
}
// turn on current note
Note(true, n.Id, builder, outDevice);
int sixteenthsToNextBarline = (int)(Math.Ceiling(currentSongPos / 16.0f) * 16.0f) - currentSongPos;
int noteSleep = (int)n.Length;
if (noteSleep >= sixteenthsToNextBarline)
{
Thread.Sleep(SixteenthNoteLengthInMs * sixteenthsToNextBarline);
noteSleep -= sixteenthsToNextBarline;
// we have a barline in the middle of this node, switch chords here
// last chord off
Note(false, lastChordOn, builder, outDevice);
currentSongPos += sixteenthsToNextBarline;
// if no the end of the song
if (currentSongPos < chords.Length * 16)
{
// this chord on
int newChord = chords[currentSongPos / 16];
Note(true, key + Scales.Major[newChord], builder, outDevice);
lastChordOn = key + Scales.Major[newChord];
}
}
if (noteSleep > 0)
{
Thread.Sleep(SixteenthNoteLengthInMs * noteSleep);
currentSongPos += noteSleep;
}
// turn off current note
Note(false, n.Id, builder, outDevice);
}
// turn last chord off
Note(false, lastChordOn, builder, outDevice);
}
}
