public SimpleMidiMessage GetNext()
{
//If both lists are empty.
if (Empty)
{
throw new NoMoreMusicException();
}
//If _storage is empty or if the next object to play is in progressQueque.
if (_storage.Count == 0 || (_partialQueue.Count != 0 && _partialQueue.Last().Timestamp <= _storage.Last().ToneStartTime))
{
return(_partialQueue.PopLast());
}
else //Get new message from _storage.
{
SingleBeatWithChannel beatWithChannel = _storage.PopLast();
//If the right channel is already assigned.
if (beatWithChannel.InstrumentType == _channelInstruments[beatWithChannel.Channel])
{
//X, Y reverse order as list should be in that order
_partialQueue.MergeInsert(StopMidiMessage(beatWithChannel), CompareSimpleMidi);
return(StartMidiMessage(beatWithChannel));
}
else //If a channel needs to be allocated before playing.
{
_channelInstruments[beatWithChannel.Channel] = beatWithChannel.InstrumentType;
_partialQueue.MergeInsert(StartMidiMessage(beatWithChannel), CompareSimpleMidi);
_partialQueue.MergeInsert(StopMidiMessage(beatWithChannel), CompareSimpleMidi);
return(ChangeChannelMidiMessage(beatWithChannel));
}
}
}
private SimpleMidiMessage StopMidiMessage(SingleBeatWithChannel beatWithChannel)
{
return(new SimpleMidiMessage(MakeMidiEvent(0x8, beatWithChannel.Channel, beatWithChannel.Tone, beatWithChannel.ToneVelocity), beatWithChannel.ToneEndTime));
}
private SimpleMidiMessage ChangeChannelMidiMessage(SingleBeatWithChannel beatWithChannel)
{
return(new SimpleMidiMessage(MakeMidiEvent(0xC, beatWithChannel.Channel, (byte)((int)beatWithChannel.InstrumentType & 0x7F), 0), beatWithChannel.ToneStartTime));
}