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ytLlive/HANDOFF.md
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# HANDOFF — session state
> Current operational state, read right after `TASKS.md`. Trust this file as the
> truth of what is in flight — do not re-derive from git/fs unless it points at
> a problem. Conventions: [`schema.md`](schema.md). Rewrite this file at session
> end, compaction, or any interruption.
## Session state (last updated: 2026-08-13)
- **Branch:** `main`. The **game audio bar + mic status dot + always-on capture**
work is **uncommitted** (see list below). The last committed+pushed baseline is
`ea250c0` (social bar click-toggle).
- **This session (audio UX follow-up):** per the creator's requests —
1. The MIC label is now a **button with a status dot** (`Models/MicStatus`:
green = capturing, yellow = requested mic problem, red = no device).
2. **Mic capture runs for the app's lifetime** (started at startup via
`StartMicCaptureAsync`, disposed in `Shutdown`; `BeginGoLive`/`StopStream`
no longer start/stop the mixer) so both meters preview live.
3. A **game audio bar** (desktop/game — meter + mute + volume, mirror of the
mic bar) sits centered beneath the preview and appears only while a
**full-screen game is producing sound** (decision: fullscreen + loopback
sound; **silence never hides an active bar** — the creator's final rule).
Show after ~500ms of fullscreen+sound, hide ~1s after leaving fullscreen.
- **Uncommitted files:** `MainWindow.xaml`/`.cs`, `ViewModels/MainViewModel.cs`,
`Services/Audio/{IAudioSource,WasapiMicAudioSource,WasapiLoopbackAudioSource,AudioMixer}.cs`,
new `Models/MicStatus.cs`, new `Services/{IGameAudioDetector,GameAudioHysteresis,GameAudioDetector}.cs`,
`ytLive.Tests/AudioMixerTests.cs`, new `GameAudioHysteresisTests.cs` +
`GameAudioDetectorTests.cs`, memory docs (TASKS.md, ai.md, Services/index.md,
ViewModels/index.md, Models/index.md, HANDOFF).
- **Verified:** build 0 warnings, 0 errors; **167 tests passing** (full suite,
after the final rebuild).
- **Landmines:**
- Never set a local `Canvas.SetTop` on the social bar — a local value permanently
overrides `{Binding SocialBarTop}` (the `ClearValue` lesson from 5.5).
- `AudioMixer` meter `Push` is unconditional **by design now**: `OnMicSample`/
`OnLoopbackSample` compute the level first, then raise the event — a
`?.Invoke(meter.Push(...))` short-circuit skipped the meter update when
nothing was subscribed (found by `RestartMic_ResetsLevel`, fixed).
- `MicConnected` comes from the source `Started` event, raised right after
`StartRecording()` succeeds — tests must `MarkStarted()` the fake source
before asserting connection state.
- Zero mic devices at startup = red dot AND the mixer is never started, so
loopback + the game bar can't run either (no capture at all) — acceptable.
- The game detector is polled on the UI thread via a 250ms `DispatcherTimer`;
`OnGameAudioPollTick` wraps `Poll()` in try/catch + `AppLog`.
- The pump reads the active scene on a background thread while the UI can still
edit it — a concurrent-mutation exception is contained (logged + `Failed` +
the pump stops), not a crash.
- `StopAsync` must stop the encoder (closes stdin) **before** awaiting the pump
loop — closing stdin unblocks a write stuck on pipe backpressure; the reverse
order deadlocks.
- Tests never instantiate `MainViewModel` directly except the round-clip
integration test (a real `MainWindow`), which never goes live — keep it that way.
- Sandbox can't reach outbound HTTPS — `HttpSocialValidator` stub-handler tests
only, never the real instance.
- **Next step:** commit + push the audio UX follow-up (the whole uncommitted set
above in one commit). Then TASK 4 ship step 6 — health stats: bind
`FramePump.HealthUpdated` (bitrate/FPS/duration) into the bottom bar. Nothing
else queued — do not expand the task queue on your own. Optional, not queued:
rewriting the healed entry's `ProfileUrl` to
`https://mastodon.llamachile.tube/@gramps` (user must say the word).
- **Secret/DB/port facts live:** OAuth client id/secret in `Helpers/OAuthCredentials.cs`;
OAuth session token in `Helpers/TokenStore.cs` (DPAPI → `%APPDATA%\ytLlive\ytLlive.auth`);
layout DB `%APPDATA%\ytLlive\ytLlive.db` (schema v8; `SocialEntry.Software`
column is a column-presence migration like the others, no version bump); OAuth callback
`http://localhost:8765/oauth2/callback`; crash log `%APPDATA%\ytLlive\startup.log`.