Native audio plugin bundle does not work on iOS

[Rickr922]

I made some custom plugins by using native audio sdk. The imported bundle works well on Mac, but when I build the game on iOS the audio processing simply does not work.
I tried to follow some of the advice that I found in this thread:

Native audio plugin bundle Import Settings for iOS build

I’ve created a custom native audio plugin using the UnityNativeAudioPluginSDK project as a reference, created the .bundle in Xcode, and dropped it into my game project’s Plugins folder. My custom plugin works as expected when I play my game in the Unity Editor, however when I build to iOS I receive this warning in Xcode: I suspect that this is due to inappropriately configured Import Settings on the plugin bundle. Unity’s page documenting native audio plugins states: Is anyone aware of docum…

But then I get an error when I build the XCode project for iOS. In particular, after registering the plugin in preStartUnity{}, in UnityAppController.mm, I get this errors:
“Using of undeclared identifier ‘MetalUpdateDisplaySync’” in file MetalHelper.mm, line 94
“‘MTLResourceStorageModeManaged’ is unavailable: not available on iOS” in file MetalHelper.mm, line 116
“‘MTLResourceStorageModeManaged’ is unavailable: not available on iOS” in file MetalHelper.mm, line 164

Is anyone aware of any documentation that shows the steps for correctly importing a bundle and a static library on Unity for iOS?
Thanks!

[cerkut]

Same error for the exact same reason.The errors relate to Metal and OSX flags, I am curious why they appear on an iOS build. Taking away the OSx dependencies from AudioPluginInterface.h does not give the errors above, but throws

Undefined symbols for architecture arm64:
"_UnityGetAudioEffectDefinitions", referenced from:
-[UnityAppController preStartUnity:] in UnityAppController.o

ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

The closest pointer I’ve found is this: GitHub - playdots/UnityPd: Procedural audio generated using unity. Now I am investigating their AudioPluginInterface.h (written for Unity 5.x it seems).

[toneTechnican]

Yeah, also getting the same errors when trying to build native audio plugin for iOS.

Which version of Unity are you both running?

The only way I could remove the error was by changing line 13 “AudioPluginInterface.h” to 0.

#   define PLATFORM_OSX 0

This allowed my project to build. But when trying to deploy, the app crashes. Need to do further investigation to see if it’s the plugin causing the crash, but I suspect it is.

Edit: I was being stupid. I think this flag definitely needs to be set! haha

[toneTechnican]

Just for those who may run into the same issue. I managed to solve it by omitting the import for “AudioPluginInterface.h” and rather defined the functions explicitly in UnityAppController.mm as follows.

extern "C" {
// We have to manually register the Unity Audio Effect plugin.
struct UnityAudioEffectDefinition;
typedef int (*UnityPluginGetAudioEffectDefinitionsFunc)(
struct UnityAudioEffectDefinition*** descptr);
extern void UnityRegisterAudioPlugin(
UnityPluginGetAudioEffectDefinitionsFunc getAudioEffectDefinitions);
extern int UnityGetAudioEffectDefinitions(UnityAudioEffectDefinition*** definitionptr);

} // extern "C"

- (void)shouldAttachRenderDelegate {}
- (void)preStartUnity {
UnityRegisterAudioPlugin(UnityGetAudioEffectDefinitions);
}

I did run into the issue of certain plugins that required MIDI not compiling. I just needed to include the according frameworks in the iOS project

[yutingchen_unity]

For this “_UnityGetAudioEffectDefinitions” reference error, the root cause is that you did not compile the AudioNativePlugin source code into .a file correctly. Please check the Xcode proj → Build Phases → Compile Sources