Ensure that the path fed to MediaPipe contains only ASCII characters

[jorpelae]

Fix for #1284

MediaPipe seems to fail to load assets from folders containing Japanese characters on Windows. After debugging the C++ side, couldn't find any obvious problem without going into MediaPipe itself.

As a workaround, I added a step to check if the asset path contains non-ASCII characters, and if this is the case, make a copy to a temporary path.

[jorpelae]

@homuler Do you think this can be merged?

[homuler]

Sorry for the delay, I forgot to check this 🙇‍♂️
I think it would be better to fix this issue on the C++ side, so I’ll take some time to look into it by the end of this year.

[homuler]

If we end up implementing a workaround on the C# side, it might make sense to change the _CacheRoot value so that the path contains only ASCII characters, since PathAsResourceFile is not expected to have side effects.

MediaPipeUnityPlugin/Packages/com.github.homuler.mediapipe/Runtime/Scripts/Unity/ResourceManager/StreamingAssetsResourceManager.cs

Line 27 in cf4c11d

_CachePathRoot = Path.Combine(Application.persistentDataPath, _RelativePath);

[jorpelae]

Sorry for the delay, I forgot to check this 🙇‍♂️ I think it would be better to fix this issue on the C++ side, so I’ll take some time to look into it by the end of this year.

Thank you for your time for looking into this.
I was not able to find any obvious fix on the C++ and attributed the crash to MediaPipe itself.
Of course if C++ side can be fixed that could be a better solution!