Receiving Midi Time Code Events

Hi, I’m new to C# and trying to figure out how the Midi Time Code works. I use _inputDevice.EventReceived and _inputDevice.MidiTimeCodeReceived EventHandler to receive Full/Quarter Frame MTC events.

When I try to use them together, only _inputDevice.EventReceived works. Sorry for the stupid question, but why is _inputDevice.MidiTimeCodeReceived not working in this case?

_inputDevice.MidiTimeCodeReceived += OnMidiTimeCodeReceived; // MTC Quarter Frame Event
_inputDevice.EventReceived += OnEventReceived; // MTC SysEx Full Frame Event

Input device is listening for events. Press any key to exit… 01/03/2021 16:04:12 MTC SysEx Full Frame: [1:53:11:13] 01/03/2021 16:04:12 MTC SysEx Full Frame: [1:2:44:24]

Separately each EventHandler works great

_inputDevice.MidiTimeCodeReceived += OnMidiTimeCodeReceived; // MTC Quarter Frame Event
//     _inputDevice.EventReceived += OnEventReceived; // MTC SysEx Full Frame Event

Input device is listening for events. Press any key to exit… 01/03/2021 16:11:49 MTC Quarter Frame: [0:29:13:27] 01/03/2021 16:11:49 MTC Quarter Frame: [0:29:13:29]

//     _inputDevice.MidiTimeCodeReceived += OnMidiTimeCodeReceived; // MTC Quarter Frame Event
_inputDevice.EventReceived += OnEventReceived; // MTC SysEx Full Frame Event

Input device is listening for events. Press any key to exit… 01/03/2021 16:31:14 MTC SysEx Full Frame: [0:17:13:14] 01/03/2021 16:31:14 MTC SysEx Full Frame: [1:18:44:21]

using System;
using Melanchall.DryWetMidi.Devices;
using Melanchall.DryWetMidi.Core;
namespace TimeCodeGen
{
    class Program
    {
        private static InputDevice _inputDevice;
        static void Main(string[] args)
        {
            _inputDevice = InputDevice.GetByName("testport");
            _inputDevice.RaiseMidiTimeCodeReceived = true;
            _inputDevice.MidiTimeCodeReceived += OnMidiTimeCodeReceived; // MTC Quarter Frame Event
            _inputDevice.EventReceived += OnEventReceived; // MTC SysEx Full Frame Event
            _inputDevice.StartEventsListening();
            Console.WriteLine("Input device is listening for events. Press any key to exit...");
            Console.ReadKey();
            if (_inputDevice != null) { }
            _inputDevice.Dispose();
        }
        // MTC SysEx Full Frame Event
        private static void OnEventReceived(object sender, MidiEventReceivedEventArgs e)
        {
            int ffHours, ffMinutes, ffSeconds, ffFrames;
            var sysEvent = e.Event as NormalSysExEvent;
            byte[] sysData = sysEvent.Data;
            ffHours = sysData[4] - 96;
            ffMinutes = sysData[5];
            ffSeconds = sysData[6];
            ffFrames = sysData[7];
            Console.WriteLine(DateTime.Now + " MTC SysEx Full Frame: [" + ffHours + ":" + ffMinutes + ":" + ffSeconds + ":" + ffFrames + "]");
        }
        // MTC Quarter Frame Event
        private static void OnMidiTimeCodeReceived(object sender, MidiTimeCodeReceivedEventArgs tc)
        {
            Console.WriteLine(DateTime.Now + " MTC Quarter Frame: [" + tc.Hours + ":" + tc.Minutes + ":" + tc.Seconds + ":" + tc.Frames + "]");
        }
    }
}

[melanchall]

I’m sure that shown events are not the same as you got when you opened the issue. In your code you have the line:

var sysEvent = e.Event as NormalSysExEvent;

But in your log there are a lot of events that are not NormalSysExEvent so your program will crash on sysEvent.Data. Use this code:

// MTC SysEx Full Frame Event
private static void OnEventReceived(object sender, MidiEventReceivedEventArgs e)
{
    int ffHours, ffMinutes, ffSeconds, ffFrames;
    var sysEvent = e.Event as NormalSysExEvent;
    if (sysEvent == null)
        return;

    byte[] sysData = sysEvent.Data;
    ffHours = sysData[4] - 96;
    ffMinutes = sysData[5];
    ffSeconds = sysData[6];
    ffFrames = sysData[7];
    Console.WriteLine(DateTime.Now + " MTC SysEx Full Frame: [" + ffHours + ":" + ffMinutes + ":" + ffSeconds + ":" + ffFrames + "]");
}
// MTC Quarter Frame Event
private static void OnMidiTimeCodeReceived(object sender, MidiTimeCodeReceivedEventArgs tc)
{
    Console.WriteLine(DateTime.Now + " MTC Quarter Frame: [" + tc.Hours + ":" + tc.Minutes + ":" + tc.Seconds + ":" + tc.Frames + "]");
}

So please uncomment

_inputDevice.MidiTimeCodeReceived += OnMidiTimeCodeReceived; // MTC Quarter Frame Event
_inputDevice.EventReceived += OnEventReceived; // MTC SysEx Full Frame Event

and check again.

[seejkee]

    if (sysEvent == null)
        return;

@melanchall Thank you very much! It’s worked 😃