MediaExtension sample architecture
Source-backed, high-level architecture notes for Apple sample-code pages grouped in the MediaExtension folder.
- Catalog module label:
MediaExtension - Coverage: 1 / 1 sample pages documented
- Source policy: archive hashes and extracted-tree references are verified locally before analysis
Samples
| Sample | Platforms | High-level architecture | Documented patterns |
|---|---|---|---|
| Supporting custom media formats and decoders | macOS | Three targets. A SwiftUI + Objective-C host app (FormatReaderAndDecoder) and two ExtensionKit extensions (SimpleContainerReader, RLEVideoDecoder) embedded in the app. Each extension’s EXPrincipalClass is a factory that conforms to a MediaExtension protocol and creates per-file or per-stream worker objects. The extensions never call each other or the app. They share only C header contracts in Shared/. |
Factory, Delegate or data-source callbacks, Binding-based state propagation |
Cross-sample signals
Recurring documented patterns
| Pattern label | Sample documents |
|---|
Type-role naming evidence
Counts below are declaration-name suffixes, not inferred patterns.
| Role suffix | Distinct declarations across samples |
|---|---|
Factory |
2 |
App |
1 |
Delegate |
1 |
Model |
1 |
View |
1 |
Swift access-control evidence
These are declaration occurrences in scanned Swift source, including implicit internal declarations.
| Access level | Occurrences |
|---|---|
implicit internal |
26 |
private |
5 |
References
Generated from the verified local catalog and completed Markdown documents.