Inter-App Midi

[Molly]

How do I broadcast inter-app MIDI messages so that I can select my app as an input from any other third party app that takes MIDI input?

I have been developing an app using the Midi-suite apps as a basis but am quite new to Midi processing in general so would appreciate some help. My app connects to a specific Midi Device that has its own unique hardware and midi messages, this means that the app then needs to decode these messages into regular note on / off messages etc. Once these messages are decoded the app allows me to send MIDI messages out to another app selected by the user. This is done by getting a list of MidiReceivers in my app using a spinner and selecting one of them. Messages are then sent out to the selected receiver using MidiReceiver.send(buffer, offset, count, timestamp).

What I want is instead to broadcast my MIDI messages out so that instead of selecting an output from my application, my application can be selected as a MIDI input from some other third party DAW or synth app.

How would I achieve this?

Thanks in advance!

[Phil Burk]

Hello Molly,

You can create a Midi Service that has an output port.

Other apps can then find and connect to your service.

You can use this Synth as an example.  https://github.com/philburk/android-midisuite/tree/master/MidiSynthExample

But in the AndroidManifest.xml you should declare an output port.

Then in your service call getOutputPortReceivers() to get the output port.

    https://developer.android.com/reference/android/media/midi/MidiDeviceService.html#getOutputPortReceivers()

You can send() data to that port. Any app connected to that port should receive the data. Your service should look like a keyboard to another app.

More docs here:

   https://developer.android.com/reference/android/media/midi/package-summary#receive_a_note

Look for "Creating a MIDI Virtual Device Service". Oddly I cannot link to that header.

Please let us know how it works out.

Phil Burk

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