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Implement movie surface stop-time queries

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gamer147
2026-07-21 14:43:24 -04:00
parent b0971f2047
commit fdcfbd9fa6
15 changed files with 330 additions and 60 deletions
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docs/platform-portability.md
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@@ -52,10 +52,12 @@ VM op 0x236 (non-modal) / op 0x20f (modal)
```
Everything before and after `DirectShowMovieDecoder` is portable. The backend currently exposes the right
conceptual operations (`TryTakeFrame`, `IsCompleted`, and `Dispose`) but they are not formalized as an
conceptual operations (`StopTimeMs`, `TryTakeFrame`, `IsCompleted`, and `Dispose`) but they are not formalized as an
interface. A future cleanup should:
1. Add an `IMovieDecoder` contract for frame delivery, completion, failure, and disposal.
1. Add an `IMovieDecoder` contract for synchronous stop-time metadata, frame delivery, completion, failure,
and disposal. Stop time must be available before `0x236` returns so an immediately following `0x23f`
remains deterministic.
2. Add an injected factory that accepts `MoviePayload` and selects an available backend.
3. Keep DirectShow in a Windows-specific source set or assembly, with its platform annotation local to it.
4. Implement a portable MPEG program-stream backend that produces the same top-down RGBA8 frames.