"Headless" version of SynthOne crashes in manual render mode about audiokitsynthone HOT 8 CLOSED

Adding a little info... I did try to upgrade the SynthOne code we're using, but I was getting build errors on sp_oscmorph2d. I've just tried building from the SynthOne repo and I see the same errors if I remove the version number from the Podfile.

from audiokitsynthone.

Are you building from the develop branch? master is currently outdated.

from audiokitsynthone.

Ah, I am building from master, yes. I'll try with develop.

from audiokitsynthone.

I'm getting Swift 5 related errors now. Our project is 4.2 (on Xcode 10.3). Is that going to be a showstopper, or is there a version of AudioKit that will work?

UPDATE: Okay, looks like I get back to the same issue with sp_oscmorph2d when running on 4.8 (specifying the pod as < 4.9 just installs 4.8). Maybe this is a showstopper... Do you have any idea what might be going on with the EXC_BAD_ACCESS when stopping and restarting AudioKit? I have tested SynthOne itself (master branch, with the AK 4.7 beta version specified in that podfile) and the problem doesn't happen there.
I've double-checked the problem, and even just adding:

DispatchQueue.main.asyncAfter(deadline: .now() + 10.0) {
            print("Stop engine (as a test)")
            AudioKit.engine.stop()
            DispatchQueue.main.asyncAfter(deadline: .now() + 2.0) {
                print("Restart engine... does stuff play?")
                try! AudioKit.engine.start()
            }
        }

at the end of my init (in Conductor), and it will crash on playing from SynthOne.

from audiokitsynthone.

The oscmorph bug got fixed in AudioKit 4.9, so you might wanna use that.

Please provide me with a new stacktrace based on a recent Synth One version, else I can't make any sense of the line numbers inside of it.

Unforuntately I don't have enough time right now to set up an environment that reflects yours. Is there any specific reason you cannot upgrade your project to the most recent swift version?

from audiokitsynthone.

Yes, like you, time is the main reason we're still on Swift 4.2... But I guess we may have to change that sooner rather than later. I did try with AudioKit 4.7.2.b1 (as in the master branch), using our original Synth One code, but I get the same crash. What I'll do a little later is try with 4.7.2.b1 with your master code (which I've confirmed doesn't have the basic stop/start bug), in our project, and see if that works to keep us going, for now.

from audiokitsynthone.

Failing a short-term fix for the stop/restart crash, what would be the recommended routine for tearing everything down and starting over—i.e., as if from initial launch? Since it is only the offline rendering/export routine that's causing a problem, it is an option for us to just completely rebuild the audio graph, but I haven't found a reliable process for doing that (which surprises me, since it seems like it should be very simple). Are there any "gotchas" that come to mind, in terms of de/re-instantiating Synth One?

from audiokitsynthone.

Okay, a Swift 5 upgrade did cure this issue. Thanks.

from audiokitsynthone.