Create Metasound Interface

Development Audio
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1

In this video, it’s shown that custom Interfaces for metasounds can be made.

Minute 19:

I’ve scoured the docs and internet but can not find anyone who’s done this.

I’d like to make an interface the returns a custom hearing state for the player listening to the metasound, similar to how attenuation gives info about the distance a metasound has to a listener.

Goal would be to have a hearingComponent which would populate this interface for any metasound they are listening to.

Any help or resource, or where for instance the other interfaces are made. I found the IAudioParameterInterfaceRegistry where the other default interfaces are added:

Audio::IAudioParameterInterfaceRegistry& InterfaceRegistry = Audio::IAudioParameterInterfaceRegistry::Get();
InterfaceRegistry.RegisterInterface(Audio::AttenuationInterface::GetInterface());
InterfaceRegistry.RegisterInterface(Audio::SpatializationInterface::GetInterface());
InterfaceRegistry.RegisterInterface(Audio::SourceOrientationInterface::GetInterface());
InterfaceRegistry.RegisterInterface(Audio::ListenerOrientationInterface::GetInterface());

but that’s as far as I’ve got in the code rabbit hole. Will post here if I find more.

2

Ok, I’ve created an interface by copying the SountAttenuation interface example.

AudioSettings.cpp
ActiveSound.cpp
SoundAttenuation.h
SoundAttenuation.cpp

While this works, I’m pretty sure an external interface can be defined and registered using RegisterExternalInterfaces → MetasoundInterface.cpp

I’ll look into how this can be done, instead of injecting code into the files to include a custom interface where the engine default interfaces be.