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Android Cast — alpha release & QA
Last updated: 2026-05-23. Use this document for feature freeze, alpha builds, and sign-off before widening testing.
Related: ROADMAP.md · README.md
Table of contents
- Alpha scope (what we ship)
- Recommended defaults (both devices)
- Feature freeze checklist (engineering)
- Alpha app sign-off (manual QA)
- Log capture (when something fails)
- Alpha backend (optional for LAN-only alpha)
- Ending feature freeze
Documentation index: README.md
Alpha scope (what we ship)
| In scope | Out of scope (frozen) |
|---|---|
| LAN discover → PIN → cast → stop | Internet relay, TLS on stream |
| UDP or TCP transport (must match on both devices) | QUIC, WebRTC, USB-tether transport in UI |
| H.264 + AAC (Android 10+ audio) | Passthrough video, Opus/Speex as default |
| Single receiver per cast session | 1:N multi-receiver (disabled in CastConfig) |
| Stream protection None (default) | FEC/NACK soak required for alpha sign-off |
| Screen capture (full / user-choice on API 34+) | Secondary-display capture, Miracast in-app |
| Camera cast (API 29+, best-effort) | Live sender mirror while casting |
| Receiver playback + notification stop | Play Store / AdMob production |
Code gate: CastConfig.ALPHA_FEATURE_FREEZE = true hides experimental transports and turns off multi-receiver selection.
Recommended defaults (both devices)
Set in Settings (or use fresh install defaults):
| Setting | Sender | Receiver |
|---|---|---|
| Transport | UDP | UDP |
| Stream protection | None | None |
| Quality | Medium | Medium |
| Resolution | Adaptive (or HD 720p if rotation is shaky) | — |
| Video codec | Auto | Auto |
| Audio | On (if API 29+) | Play incoming audio: On |
| Capture mode | Full screen (or User choice on Android 14+) | — |
| PIN | Same on both (default 1234) |
Same |
Rotation soak: On Mediatek / Freeme senders (e.g. BL6000), prefer system rotation lock ON during first alpha pass; then repeat with lock OFF to validate debounced reconfigure.
Feature freeze checklist (engineering)
| Item | Status |
|---|---|
ALPHA_FEATURE_FREEZE — UDP/TCP only in settings |
Done |
| Multi-receiver disabled for alpha | Done |
| Stored QUIC/WebRTC transport clamped to UDP on load | Done |
| Camera strings (permission vs unavailable) | Done |
README matches CastConfig / CastSettings defaults |
Done |
| Receiver: keyframe idle grace + debounced sender resize | Done (verify on soak) |
| Preview paused during cast (single MediaProjection) | Done |
| Developer-only: FEC, QUIC, USB-tether, immersive presets | Gated (dev settings) |
Alpha app sign-off (manual QA)
Run on two physical devices, same Wi‑Fi subnet. Record build: About / versionName from APK, git commit, date.
A. Smoke (required — all must pass)
| # | Step | Pass |
|---|---|---|
| A1 | Install same debug/release APK on sender + receiver | ☐ |
| A2 | Receiver: Receive → Start listening → notification Listening / Ready | ☐ |
| A3 | Sender: Send → discover receiver → correct PIN → approve capture | ☐ |
| A4 | Video appears on receiver within 15 s of auth | ☐ |
| A5 | Audio audible (if enabled and API 29+) within 20 s | ☐ |
| A6 | Sender notification shows Casting with resolution | ☐ |
| A7 | Stop from sender notification → stream ends, receiver returns to idle | ☐ |
| A8 | Stop from receiver notification → sender stops cleanly | ☐ |
| A9 | Second cast without reinstall (A2→A7 again) | ☐ |
B. Resilience (required)
| # | Step | Pass |
|---|---|---|
| B1 | Sender home → cast 5 min, no reboot / ANR | ☐ |
| B2 | Receiver app to background 2 min → return → video recovers or clean idle | ☐ |
| B3 | Receiver rotate once → video continues or recovers within 10 s | ☐ |
| B4 | Sender rotate with rotation lock ON → 5 min stable | ☐ |
| B5 | Sender rotate with lock OFF (optional / device-specific) → no permanent freeze; note if reboot | ☐ |
C. Settings matrix (pick one row for official alpha demo)
| Profile | Transport | Protection | Use |
|---|---|---|---|
| Alpha default | UDP | None | Primary sign-off |
| Fallback | TCP | None | If UDP glitches on your AP |
| # | Step | Pass |
|---|---|---|
| C1 | UDP + None: 10 min soak | ☐ |
| C2 | (Optional) TCP + None: 10 min soak | ☐ |
D. Regression guards (quick)
| # | Step | Pass |
|---|---|---|
| D1 | Wrong PIN → clear error, no crash | ☐ |
| D2 | Mismatched transport (sender TCP / receiver UDP) → fails fast with message | ☐ |
| D3 | Camera mode (if used): permission grant → cast 2 min | ☐ |
| D4 | Calibration test mode → pattern on receiver | ☐ |
E. Known limitations (not alpha blockers)
- No TLS; LAN cleartext.
- UDP may drop frames under congestion.
- No live preview on sender while casting.
- Some apps silent under playback capture policy.
- Heavy rotation on some OEMs may still stress system WFD/WM (watchdog) — document device + lock state.
Alpha approved when: all A, B1–B4, and C1 pass on your reference sender + receiver pair.
Log capture (when something fails)
From repo root:
./scripts/alpha-qa-logcat.sh SENDER_SERIAL RECEIVER_SERIAL
Or manually:
adb -s SENDER logcat -s ScreenCastService:* ReceiverCastService:* AndroidCast:* SenderScreenPreview:*
adb -s RECEIVER logcat -s ReceiverCastService:* AndroidCast:*
Alpha backend (optional for LAN-only alpha)
LAN demo does not require OTA/crash backend. For full alpha with updates and crash upload:
| Item | Notes |
|---|---|
Host examples/ota/v0/ |
See OTA.md |
| Deploy crash reporter | See CRASH_REPORTER.md |
| Configure URLs | Developer settings or local.properties |
Ending feature freeze
- Complete sign-off table above; note devices + APK build id in git tag message.
- Tag release on
masterper GIT_FLOW.md. - To re-enable experiments on a dev branch: set
CastConfig.ALPHA_FEATURE_FREEZE = falseand restoreMULTI_RECEIVER_ENABLEDas needed.
Post-alpha priorities: rotation-stable encode path, encoder thumbnail on sender, secondary-display capture (roadmap D).