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Asked By
MarcPhi
Hello is there a way to send midi signals (outputs) to a device? Detecting of midi Inputs works fine. I couldn’t find anything in the documentation.
It would always work with some GDNative C++ code using rtMIDI for example, but I also wondered why there’s only one directionaly MIDI support with GDScript. I guess I will reach in a feature request as it was suggested in this answer to my forum post and it’s good to now I’m not the only one who is interested in this: https://godotforums.org/discussion/21679/why-only-midi-input-and-no-output#latest
bestdani | 2020-02-07 02:56
Yes, it would be a good feature to have MIDI out support
Hello there !! I found this archive while searching how to do it !!
After a few hours, I have found a solution, but nothing as well referenced as this convo :°)
So, there is this person, NullMember, who made a plugin:
It’s a life saver !! Basically I tried, personally, to light a led up with midi signal, using a godot project;
So, as said in NullMembers doc, using their plugin you can “enable” it by putting a :
func _ready():
midi_out.open_port(x)
x being the port you want to send info to ;
Personally, I had no idea on which port my little led was plugged (via a pcb that would do some handywork to transform the signal to analogic)
So I went on and downloaded the alsa-utils package (I’m on linux) and I was then able to use the amidi cli tool
The “amidi -l” command gave me the plugged devices
I saw hw:1,0,0 and hw:1,0,1
After that I used the command amidi -p hw:1,0,1 -S “B0 3F 127F” to turn on the led then the same command but ending with 00 to turn it off
It didn’t work. I had to go read the doc about the cards I was using tho, and realized that I needed to issue two commands, one with at the end “B0 1F 127F” then one with “B0 3F 127F”.
But that’s just my hardware, yours might work with just one command :°)
After that, I could return to godot and set x as 2, as it is the second midi interface scanned in the list that amidi -l outputted
Then, I used a function from NullMembers plugin (again), which is
midi_out.send_message([a ,b ,c ])
I set a = 0xB0
b = 0x3F
c = 0x127F
Basically they’re the same values as the sent values at the end of the amidi -p command
So normally putting the same ones there should be okay
Again because of my hardware interface I had to send 2 commands via godot but hey, it works :))
So yeah the plugin’s great and amidi was a great help in all that
So for the others that might come across this page, I hope the story of how my afternoon went helps you out :°D
