ytLlive/Services/index.md

Services — index

External-facing logic: YouTube API, persistence. See schema.md for the memory-map conventions.

File	Purpose
YouTubeAuthService.cs	OAuth2 via Google: loopback callback (http://localhost:8765/oauth2/callback), token exchange, refresh, channel fetch. Constructor takes optional HttpClient + sessionChanged callback (test seam + save hook); session persists via Helpers/TokenStore (DPAPI); ClearSession() signs out (called by MainViewModel.StopStream on End Livestream)
YouTubeStreamService.cs	Broadcast/stream management via the v3 API (enableAutoStart/Stop). Not yet switched to the variable reusable stream
YouTubeChatService.cs	Polls liveChat/messages, raises MessageReceived; IDisposable
LayoutStore.cs	SQLite persistence (Microsoft.Data.Sqlite) at %APPDATA%\ytLlive\ytLlive.db; assets stored as BLOBs keyed by SHA-256 content hash; save/open layout files; schema user_version 2 (Source.ClipShape/IsMirrored — added by ALTER TABLE for pre-v2 DBs)
VideoFrame.cs	Normalized CPU frame seam (Width/Height/tightly-packed BGRA byte[]) — the only pixel type the rest of the app knows about; future capture sources (screen, background-removed webcam) feed the same seam
CameraDeviceInfo.cs	(Id, DisplayName) for a physical capture device
ICameraEnumerator.cs	GetCamerasAsync() — seam so the picker/CameraManager never touch WinRT (tests inject fakes)
ICameraFrameSource.cs	StartAsync/StopAsync/FrameAvailable(VideoFrame) — seam for a running capture source
MediaCaptureCameraEnumerator.cs	WinRT enumeration via DeviceInformation.FindAllAsync(DeviceClass.VideoCapture)
MediaCaptureFrameSource.cs	CPU-first MediaCapture source (MemoryPreference = Cpu, BGRA8 via CreateFrameReaderAsync); frames arrive on a worker thread
CameraManager.cs	Webcam capture ownership: refcounted by DeviceId, one shared WriteableBitmap per camera, dispatcher-coalesced ~render-rate UI updates (latest-frame drop); PreviewBitmapChanged/CameraFailed events

Related: constructed in ViewModels/MainViewModel.cs (no DI container yet). Models in Models/index.md. OAuth credentials live in Helpers/OAuthCredentials.cs.