NScumm.Core.MidiParser.OnTimer C# (CSharp) Method

        public void OnTimer()
        {
            uint endTime;
            uint eventTime;

            if (Position.PlayPos == 0 || MidiDriver == null)
                return;

            AbortParse = false;
            endTime = (uint)Position.PlayTime + TimerRate;

            // Scan our hanging notes for any
            // that should be turned off.
            if (HangingNotesCount != 0)
            {
                foreach (var ptr in HangingNotes)
                {
                    if (ptr.TimeLeft != 0)
                    {
                        if (ptr.TimeLeft <= TimerRate)
                        {
                            SendToDriver(0x80 | ptr.Channel, ptr.Note, 0);
                            ptr.TimeLeft = 0;
                            --HangingNotesCount;
                        }
                        else
                        {
                            ptr.TimeLeft -= (int)TimerRate;
                        }
                    }
                }
            }

            while (!AbortParse)
            {
                var info = _nextEvent;

                eventTime = (uint)(Position.LastEventTime + info.Delta * _psecPerTick);
                if (eventTime > endTime)
                    break;

                // Process the next info.
                Position.LastEventTick += info.Delta;
                if (info.Event < 0x80)
                {
//                    Console.Error.WriteLine("Bad command or running status {0:X2}", info.Event);
                    Position.PlayPos = 0;
                    return;
                }

                if (info.Command == 0x8)
                {
                    ActiveNote(info.Channel, info.Param1, false);
                }
                else if (info.Command == 0x9)
                {
                    if (info.Data.Length > 0)
                        HangingNote(info.Channel, info.Param1, (int)(info.Data.Length * _psecPerTick - (endTime - eventTime)));
                    else
                        ActiveNote(info.Channel, info.Param1, true);
                }

                // Player::metaEvent() in SCUMM will delete the parser object,
                // so return immediately if that might have happened.
                bool ret = ProcessEvent(info);
                if (!ret)
                    return;

                if (!AbortParse)
                {
                    Position.LastEventTime = (int)eventTime;
                    ParseNextEvent(_nextEvent);
                }
            }

            if (!AbortParse)
            {
                Position.PlayTime = (int)endTime;
                Position.PlayTick = (int)((Position.PlayTime - Position.LastEventTime) / _psecPerTick + Position.LastEventTick);
            }
        }
    }