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Background MIDI on iOS 13

simulacrimationssimulacrimations
in General App Discussion

Hey all, aspiring iOS music dev here :smiley:

I've been working on a MIDI sequencer for a while now, and unfortunately iOS 13 seems to have killed it. Before I start over from near-scratch, I wanted to check with some of the other devs here.

My strategy for sequencing MIDI, was to spawn my own C++ thread, and schedule MIDI events from there using mach_time. I managed to get that running in the background on iOS by enabling background audio, and using Audiokit to play silence whenever my sequencer played.

However, Apple seems to have axed that strategy with their new background task management. My sequencer no longer plays when the app is in the background. I looked into using BackgroundTask, but it doesn't seem to allow infinite background tasks (I've read anecdotes of max 3 minutes before iOS pauses/kills the task).

My only idea now is to use a CoreAudio render callback to do my MIDI processing. Is this my only option? Any help would be much appreciated!

Comments

  • brambosbrambos

    That’s how I do it and that still works. I don’t have experience with Audiokit so I don’t know what has changed and whether they can fix it.

  • simulacrimationssimulacrimations

    Thanks for the quick reply! The MIDI sequencing gods have spoken :lol:
    I tried so hard to avoid dealing with CoreAudio for this first project... but it looks like my fate is sealed :fearful:

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