2.3.0 Release crashes FL Studio Mac about juicysfplugin HOT 6 CLOSED

thanks for telling me. I'd been doing all my testing in JUCE's audio plugin host, so I missed this. FL Studio is the most important DAW, so definitely need to get this working.

the issue reproduces for me also; I've tried adding an instance of the AU plugin to an FL Studio project. A white rectangle is rendered, mouse cursor beachballs.

I've attached a debugger to OsxFL, and I've hit "pause" on program execution to see where it's hung:

It gets to the first line of initialising FluidSynthModel, and hangs whilst trying to allocate a new_fluid_settings(). specifically it's waiting to acquire some kind of mutex. fluid_audio_settings is nearby, so I wonder whether this is the same deadlock that we had on the previous version of FluidSynth (FL Studio wants exclusive access to CoreAudio, so fluidsynth waits forever).

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if indeed this is the same deadlock, then this is how I fixed it last time:

// deactivate all audio drivers in fluidsynth to avoid FL Studio deadlock when initialising CoreAudio
// after all: we only use fluidsynth to render blocks of audio. it doesn't output to audio driver.
const char *DRV[] {NULL};
fluid_audio_driver_register(DRV);

I've just now tried shuffling that line up by one so that it occurs before we attempt to create new_fluid_settings(), but that didn't help. maybe a different workaround is needed in FluidSynth2.

pretty much all configurability of fluidsynth requires that you first succeed in creating a settings object. we're a bit constrained because we can't even get as far as that.

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okay yeah; it's the same deadlock as we had in fluidsynth1:

inside new_fluid_settings() fluidsynth invokes fluid_core_audio_driver_settings() to configure a default audio driver (which we don't want anyway). it tries to ask how many outputs the driver has, but FL Studio has a lock on the audio object, so we have to wait (forever) to get our answer.

I wonder why the usual trick (asking to disable all audio drivers) has stopped working in fluidsynth2.

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oh, actually: my fix did work (moving the audio driver deregistration code). the only problem was that I wasn't doing a sufficiently clean build.

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@lrcaldwell please tell me whether release 2.3.1 is working any better for you.

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@Birch-san 2.3.1 is now working in FL, still works in Ableton too. Thank you!~

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