24 lines
1.7 KiB
Markdown
24 lines
1.7 KiB
Markdown
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# External plugin hosting evaluation
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Decision: defer external hosting after Phase 9. The native source API is useful
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for proving processor contracts without adding an SDK or scanning/loading code.
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| Candidate | Benefits | Work required before adoption |
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| --- | --- | --- |
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| LV2 | Open specifications, established Linux hosts/plugins | RDF discovery and feature negotiation, URIDs, state, UI lifetime, worker requests and event mapping; likely additional discovery dependency |
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| CLAP | C ABI, explicit lifecycle and event model | Extension negotiation, parameter/state persistence, host callbacks, main/audio-thread scheduling and UI integration |
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| VST3 | Broad plugin availability | SDK/license review for the selected SDK release, C++ adapter outside the C core, component/controller and editor lifecycle, state and event translation |
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No candidate was linked, scanned or loaded in this phase. API/SDK and plugin
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licenses must be checked at the revision actually adopted; they are separate
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from xtc's MIT license. Supporting a format does not grant redistribution rights
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to individual plugins. Do not search user plugin directories from the callback.
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Before implementation, require versioned module identity and state, a missing-
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plugin recovery policy, preparation failure/partial cleanup tests, bounded events
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and parameter publication, latency/tail handling, callback-safe unload after
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retirement, a GUI/main-thread boundary and an explicit crash-containment decision.
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Native ABI tests cover some ownership mechanics but do not prove third-party
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code safe. Event graph ports and custom-instrument GUI selection remain gaps.
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Choose one format with concrete user needs after those contracts are specified;
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do not introduce a general multi-format framework now. See decision 0008.
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