How do you create a MidiEventPacket with Channel using CoreMidi?

Question

Here is my code to create a Midi Event Packet. It creates a note on/off event with velocity and note number on channel 1.

How can I set a channel number?

var midiEventPacket = MIDIEventPacket ()
midiEventPacket.timeStamp = 0
midiEventPacket.wordCount = 1
midiEventPacket.words.0 = isNoteOff ? 0x20900000 : 0x20800000
midiEventPacket.words.0 = midiEventPacket.words.0 | ((note) << 8) // Note  = 60
midiEventPacket.words.0 = midiEventPacket.words.0 | UInt32(velocity) // Velocity = 127

score 3 · Answer 1 · edited Oct 29 '22 at 21:24

3

I just found the solution. You need to add a channel to the Note On / Note Off hex value:

var midiEventPacket = MIDIEventPacket ()
midiEventPacket.timeStamp = 0
midiEventPacket.wordCount = 1
midiEventPacket.words.0 = (isNoteOff ? 0x20900000 : 0x20800000) + (UInt32(channel - 1) << 16) // -1 because midi channel range is 1..16
midiEventPacket.words.0 = midiEventPacket.words.0 | ((note) << 8) // Note  = 60
midiEventPacket.words.0 = midiEventPacket.words.0 | UInt32(velocity) // Velocity = 127

edited Oct 29 '22 at 21:24

TylerP

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answered Oct 29 '22 at 20:07

Sébastien REMY

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btw, you have your note on/off values the wrong way around in your logic. – adamjansch Jul 12 '23 at 16:00
@adamjansch can you tell me more? – Sébastien REMY Jul 23 '23 at 12:52
`0x20800000` is the note off message, but you have `isNoteOff == true` using `0x20900000`. – adamjansch Jul 24 '23 at 07:34

How do you create a MidiEventPacket with Channel using CoreMidi?

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