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Architecture

Baballonia is an MVVM Avalonia cross-platform application using dependency injection, and C# as its primary programming language.

The pages you can touch and see in the app are represented with their:

  1. Model .axaml that defines how UI elements are laid out
  2. View Glue that binds the UI to business, transforms data
  3. ViewModels the real business logic layer. Each ViewModel composes Services (reusable classes) to extend functionality.

Hot Path Lifecycle​

To contextualize the above, consider the lifecycle of a camera frame to be converted to and sent out to a game:

  1. Baballonia initializes its services in the App.axaml file.
  2. Baballonia loads Views and defaults to the Home pages.
  3. Home page, in its services, has references to:
FacePipelineManager facePipelineManager,
EyePipelineManager eyePipelineManager,
IFacePipelineEventBus facePipelineEventBus,
IEyePipelineEventBus eyePipelineEventBus,
...

EyePipelineManager manages EyeProcessingPipeline and FacePipelineManager manages FaceProcessingPipeline. Let's just focus on the eye pipeline for now. Both Pipelines extend the DefaultProcessingPipeline, which is responsible for the underlying machine-learning inference. Each Pipeline fires off an event when there is new data from an inference run, in this case from the Home page.

Now consider the ParameterSenderService. In it constructor, we also inject the EyeProcessingPipeline and FaceProcessingPipeline. Here, when there is new data, we Queue information to be send out via the OscSendService.

The above cylce repeats.