Android Audio Reactivity

[andybak]

No description provided.

[Copilot]

Pull request overview

Adds an IL2CPP/AOT-friendly (managed) audio analysis path and switches mobile builds to use Unity app-output audio for “audio reactive” visuals, with additional diagnostics to validate Android behavior.

Changes:

• Added managed FFT + biquad filter implementations (and editor tests) for platforms where CSCore/system-audio capture isn’t available (eg. Android/iOS, IL2CPP).
• Updated audio analysis/capture compile-guards to separate “system audio capture” from “audio analysis”, and routed low/high-pass data into the appropriate injectors.
• Adjusted mobile UX messaging and added Android-specific logging for capture/visualizer state and sample/FFT stats.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
Assets/Scripts/VisualizerManager.cs	Switches FFT/filter backend selection, fixes band normalization edge-case, routes low/high-pass to injectors, and adds Android logging.
Assets/Scripts/VisualizerManagedAnalysis.cs.meta	Unity meta for new managed analysis script.
Assets/Scripts/VisualizerManagedAnalysis.cs	New managed FFT + filter implementations intended for IL2CPP/AOT platforms.
Assets/Scripts/VisualizerCSCoreFilter.cs	Tightens CSCore usage guards to exclude mobile and allow explicit system-capture disable.
Assets/Scripts/VisualizerCSCoreFFT.cs	Tightens CSCore usage guards to exclude mobile and allow explicit system-capture disable.
Assets/Scripts/Tools/MultiCamTool.cs	Updates mobile prompt text to reflect “in-app” audio source.
Assets/Scripts/SystemAudioMonitor.cs	Aligns CSCore/system-audio capture compilation guards with new define.
Assets/Scripts/AudioCaptureManager.cs	Defaults mobile to App audio capture and improves App capture activation behavior; adds Android logs.
Assets/Scripts/AppAudioMonitor.cs	Drives visualizer from Unity mixed output on mobile; adds optional debug tone and Android logs.
Assets/Editor/Tests/TestVisualizerManagedAnalysis.cs.meta	Unity meta for new managed analysis tests.
Assets/Editor/Tests/TestVisualizerManagedAnalysis.cs	Adds tests covering managed FFT bin detection and managed filter behavior.
Assets/Editor/BuildTiltBrush.cs	Changes IL2CPP build define from disabling all audio capture to disabling only system-audio capture.

Files not reviewed (2)

• Assets/Editor/Tests/TestVisualizerManagedAnalysis.cs.meta: Language not supported
• Assets/Scripts/VisualizerManagedAnalysis.cs.meta: Language not supported

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[andybak]

This isn't much use without audio widgets which are folded into #985 now. Folded this in also so we can close the PR