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TASK 21 slice 1 step 4: wire media into resolver + preview routing

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Wire the MediaVideoSourceManager into the live pipeline (new partial
ViewModels/MainViewModel.Media.cs mirrors Webcam/Background partials):
readonly _mediaManager assigned in the core ctor (decode at 1920x1080 master,
dispatcher-coalesced preview), OnMediaPreviewBitmapChanged adopts the shared
bitmap onto every IsMediaSource with a matching MediaPath, a
Source { IsMediaSource, MediaPath } case in ResolveOutputFrame feeds
GetLatestFrame, and the manager is disposed on shutdown.

Source.DisplaySource now routes VideoImageSource for MediaSource (Source.cs),
so media previews/canvas show decoded video.

Compositor needs no change: BlitContent UniformToFill-scales any frame to the
element rect. Decoder/manager/seam derived-work mirrors ScreenCaptureManager
(citation in commit for slice-step-3).

Test (one unit for this change, mirroring the live-capture case):
Source_DisplaySource_IsVideoImageSource_WhenMediaSource. 14/14 media +
DisplaySource tests pass, build 0 warnings. Docs (TASKS/HANDOFF/ai.md) updated.
This commit is contained in:
Llama Chile Shop
2026-08-31 19:32:41 -07:00
parent 480ead0fc7
commit 071ec8be0c
7 changed files with 85 additions and 16 deletions
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ai.md
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@@ -680,8 +680,10 @@ seam:** `Func<Scene?>`, `Func<SceneElement, VideoFrame?>` resolver, `Func<Compos
(`Services/MediaVideoSourceManager.cs`): refcounted by `MediaPath`, `Func<string, IMediaFrameSource?>` factory
seam (mirror of `ScreenCaptureManager`), `AcquireAsync`/`ReleaseAsync`/`ReleaseAllAsync`/`GetLatestFrame`,
coalescing each file's frames onto the UI dispatcher onto one shared `WriteableBitmap`. Frames emit as fast as
the pipe produces them; native-FPS pacing (ffprobe probe) and the resolver/preview wire-in (`ResolveOutputFrame`
case + `Source.DisplaySource`) are the next slices.
the pipe produces them. Wired into the live pipeline (slice 1 step 4): `ResolveOutputFrame` reads
`_mediaManager.GetLatestFrame(MediaPath)` for a `MediaSource`, and `Source.DisplaySource`
(`Models/Source.cs`) routes `VideoImageSource` for `MediaSource` so the preview/canvas show decoded video.
Still open: session acquisition on add/remove (UI picker), native-FPS pacing (ffprobe probe), loop control.
- **Social bar on the output (bar bug-fix branch):** the `FramePump` takes an optional
`socialBar: Func<(VideoFrame? Frame, SocialBarPosition Position)>?` seam, re-read **every frame** (so a
mid-stream position flip applies immediately). The strip is pre-rasterized by `Compositor/SocialBarRenderer.cs`