Creating visuals with Music Understanding analysis results

At a glance

Project structure

Source bundle/
└── MusicUnderstandingLab/
    └── MusicUnderstandingLab/
        ├── MusicUnderstandingLab.swift
        └── Views/
            ├── LoudnessView.swift
            ├── StructureRoundedBarView.swift
            ├── VisualizationView.swift
            ├── ContentView.swift
            ├── InstrumentActivityView.swift
            ├── InstrumentRangesView.swift
            ├── KeyView.swift
            ├── PaceView.swift
            ├── PlayheadView.swift
            ├── RhythmView.swift
            └── SongSelectionView.swift

Structure observations

• Architecturally prominent files are ranked from entry points and role-named declarations; resource-only paths are omitted.
• Primary languages: Swift.
• The verified tree contains 4 project/configuration file(s) and 39 source declaration(s).

Overall architecture

flowchart LR
    N1["MusicUnderstandingLab"]
    N2["ContentView"]
    N3["SongAnalysisDocument"]
    N4["AssetPlayer"]
    N5["MusicUnderstanding APIs"]
    N1 --> N2
    N2 --> N3
    N3 --> N4
    N4 --> N5

Reference code

MusicUnderstandingLab/MusicUnderstandingLab/MusicUnderstandingLab.swift:10 — architecture anchor

@main
struct MusicUnderstandingLab: App {
    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

Interpretation

The arrows summarize the source-visible entry, role-named types or folders, and framework direction; when nodes come from structural folders, the sequence is a high-level interpretation rather than proof that every adjacent node calls the next. Ownership is claimed only where the next section cites a stored property or assignment. The diagram is intentionally limited to the dominant path into Music Understanding.

Ownership and state

classDiagram
    LoudnessView *-- CGFloat : contentSpacing
    LoudnessView *-- CGFloat : statsSpacing
    LoudnessView *-- CGFloat : chartSpacing
    LoudnessView *-- Float : loudnessMin

Ownership evidence

MusicUnderstandingLab/MusicUnderstandingLab/Views/LoudnessView.swift:14 — stored dependency or nearest verified ownership anchor

    private enum Constants {
        static let contentSpacing: CGFloat = 12
        // ...
    }

Composition arrows indicate a source-visible construction expression or locally owned value state; aggregation means the owner stores or receives a dependency without proving exclusive lifetime ownership.

Class and protocol design

MusicUnderstandingLab/MusicUnderstandingLab/Views/LoudnessView.swift:11 — representative type boundary

struct LoudnessView: View {
    // ...
}

No local protocol conformance is claimed as protocol-oriented design; external framework conformances are listed only as dependencies.

Access control

Reference code

MusicUnderstandingLab/MusicUnderstandingLab/App/AssetAnalyzer.swift:19 — representative boundary

    private(set) var result: MusicUnderstandingSession.SessionResult?

    /// Protects against duplicate calls to `analyze()`
    private(set) var isAnalyzing = false

    /// The asset's filename without extension, suitable for display.
    var displayName: String {
        // ...
    }

Swift declarations without a modifier are internal; explicit private, fileprivate, private(set), public, or open entries above are interpreted by language semantics. Objective-C/C samples instead rely on header and implementation boundaries, which are not equivalent to Swift lexical privacy.

Logic ownership and placement

Design patterns

Naming conventions

• Types: Document: SongAnalysisDocument; Player: AssetPlayer; View: ContentView, InstrumentActivityView, InstrumentRangesView, KeyView, LoudnessView.
• Protocols: no local protocol declaration in the scanned source.
• Methods: statsRow, statItem, stopAccessingSecurityScopedResource.
• Files: MusicUnderstandingLab/MusicUnderstandingLab/MusicUnderstandingLab.swift, MusicUnderstandingLab/MusicUnderstandingLab/Views/LoudnessView.swift, MusicUnderstandingLab/MusicUnderstandingLab/Views/StructureRoundedBarView.swift, MusicUnderstandingLab/MusicUnderstandingLab/Views/VisualizationView.swift, MusicUnderstandingLab/MusicUnderstandingLab/Views/ContentView.swift, MusicUnderstandingLab/MusicUnderstandingLab/Views/InstrumentActivityView.swift.

Architecture takeaways

• MusicUnderstandingLab is the main source-visible entry or composition anchor for this sample.
• Framework work reaches SwiftUI, MusicUnderstanding, CoreMedia, AVFoundation through a deliberately small high-level chain; the detailed API graph remains inside the cited implementation files.
• Stored-property evidence identifies lifecycle collaboration; it does not by itself prove exclusive object ownership.
• Access-control conclusions separate verified language visibility from the likely design rationale.
• The source does not justify labeling the design protocol-oriented.

Source map

• Official Apple documentation