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Multi-threading audio processes? or, what's the right way to do this?

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    Multi-threading audio processes? or, what's the right way to do this?

    Hi all,

    I'm trying to wrap my head around how to best run a third-party audio-generating process within UE4, namely the STK (Synthesis Toolkit) C++ codebase running RtAudio as a backend. Any wisdoms would be much appreciated.

    To date, I've compiled the STK as a Windows 64bit .dll, which I can call from a simple cmd line app. In this hacktastic test setup, I initialize my STK instance in a separate thread ( e.g. std::thread InitThread(initSTK, <parameters>) ) then call noteOn, noteOff style methods to generate glorious bowed strings. Crude, but effective.

    Seeing that one can load a DLL within Unreal, I created a BlueprintFunctionLibrary to load my dll (following

    Blueprints show up as one would expect, but UE will hang when I call my initSTK method... as expected, assuming STK is just trying to run on the main thread and never exits.

    While I have many questions, to limit scope here, perhaps just a few:

    1) Would it be possible/advisable to pursue this direction, calling my initSTK method on its own thread (e.g. as a background task via ->StartBackgroundTask, with FNonAbandonableTask)

    2) Is there a better way, such as aiming to roll the STK into a Plugin?

    I'm still exploring everything around these code-bases so any suggestions could be helpful at this point.

    Thanks in advance,


    rob hamilton
    assistant professor of music and media
    rensselaer polytechnic institute
    Last edited by robhamilton; 08-13-2019, 03:07 AM.