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Android Cast — implementation roadmap
Last updated: 2026-06-04. Living document — refine as alpha and commercial tracks progress.
Table of contents
- Alpha definition
- Product positioning
- USB-C / HDMI (roadmap D) and USB-tether cast (roadmap E)
- Commercial (Play Store prep)
- Crash console open API
- Stream protection (FEC / NACK)
- libvpx / Opus / Speex
- Transports & protocols
- Receiver / sender UX
- Remote access (alpha — RSSH)
- Auth & email (alpha)
- Deferred / post-alpha
- Related docs
Documentation index: README.md
Alpha definition
| Track | Goal | Status |
|---|---|---|
| Android app | Stable, feature-rich, demo-ready on LAN (discover → PIN → cast → stop; soak two devices) | Core path done; polish UX/docs and gate experimental options for show |
| Backend | Deployed OTA channel + crash ingest + on-demand remote access (RSSH, prod/hidden) | WIP — examples under examples/; WireGuard v1 lab path done; RSSH implementation in progress |
Alpha app can ship before backend is live if the demo is LAN-only. Full alpha includes OTA/crash URLs configured in developer settings or local.properties.
Alpha app checklist
Runbook: ALPHA.md (feature freeze, defaults, sign-off tables, log script).
| Checkpoint | Engineering | Manual sign-off |
|---|---|---|
| Happy path: UDP + H.264/AAC + single receiver, protection None | Defaults + freeze in code | ☐ ALPHA.md § A, C1 |
README matches CastSettings / CastConfig |
Done | — |
| Fix misleading strings (camera permission vs unavailable) | Done | — |
| Two-device QA (rotate, background, notification stop) | Script in scripts/alpha-qa-logcat.sh |
☐ ALPHA.md § B |
| Cap multi-receiver at 1 for alpha | MULTI_RECEIVER_ENABLED off while freeze on |
— |
| Hide QUIC/WebRTC/USB in settings for alpha | ALPHA_FEATURE_FREEZE |
— |
| Receiver stuck on rotation / STREAM_CONFIG storm | Debounce + idle grace in code | ☐ B4–B5 |
Alpha backend checklist
- Host
examples/ota/v0/channel JSON + APK artifacts - Deploy
examples/crash_reporter/backend/(seenginx.conf,README.md) - Set
ota.channel.urland crash upload URL in dev settings /local.properties - RSSH remote access (alpha essential): device opt-in via
heartbeat.php(type: ra,opt_in_mode: rssh); outbound SSH reverse tunnel to bastion; no VPN permission / no status-bar key; operator whitelist + session open in BE UI; E2E validation per REMOTE_ACCESS_VALIDATION.md (RSSH path TBD) - WireGuard v1 remains available for lab/E2E; not required for alpha sign-off if RSSH meets owner criteria
- Email infra (alpha essential):
info@/admin@/root@onapps.f0xx.org→ Gmail forward; SPF/DKIM/DMARC — 20260607-2FA-email-mobile-auth-flow.md §9 - Registration + 2FA (alpha essential): email verify + TOTP + mobile-friendly login/register — §10
Remote access (alpha — RSSH)
Owner agreement: production RSSH (reverse SSH, hidden — no VpnService) is an essential part of the alpha release, not post-alpha. WireGuard v1 is implemented for infra/E2E lab work; alpha remote-debug UX targets RSSH.
| Item | Status |
|---|---|
BE control plane (heartbeat.php type: ra, admin UI, RBAC, purge cron) |
Done |
WireGuard v1 (device VpnService, UDP DNAT, WireGuardPeerProvisioner) |
Done (lab) |
BE opt_in_mode: rssh + bastion/session provisioning |
TODO |
| Android RSSH mode selectable (no VPN prompt) | TODO |
| Outbound reverse SSH client + foreground service | TODO |
| Operator E2E (whitelist → open session → shell/file on bastion) | TODO |
Implementation notes: REMOTE_ACCESS_IMPL.md · proposal: 20260602_REVERSE_SSH_proposals_summary.md.
Auth & email (alpha)
Owner agreement: public email aliases + registration with email verification and 2FA (TOTP) are alpha must-have for the crashes/build consoles.
| Item | Status |
|---|---|
DNS forward info@ / admin@ / root@ → Gmail |
Ops TODO |
BE SMTP outbound (noreply@apps.f0xx.org) |
TODO |
Migration 008_auth_email_2fa |
TODO |
| Register + verify + TOTP enroll/login | TODO |
| WebAuthn / passkeys (optional alpha) | TODO |
| Admin: recovery email, clear lockouts, audit | TODO |
Full spec: 20260607-2FA-email-mobile-auth-flow.md.
Product positioning
- Primary: Wi‑Fi LAN cast when USB-C→HDMI wired mirror fails or is unavailable (common on some tablets).
- Not in scope for v0: Internet relay (
gateway_url_hint), TLS on cast protocol, WebRTC as default transport.
See USB_HDMI_CAST.md for wired display vs Wi‑Fi cast.
USB-C / HDMI (roadmap D) and USB-tether cast (roadmap E)
| Item | Status |
|---|---|
WiredDisplayMonitor — detect external displays |
Done |
ExternalDisplayCapturePolicy + developer UI |
Done (policy stored; capture still default display) |
ScreenCastService display hot-plug hooks |
Done |
| Secondary-display MediaProjection capture | TODO |
UsbTetherCastTransport stub + dev-gated transport id |
Done |
| USB tether / ADB reverse discovery + framing | TODO |
Details: USB_HDMI_CAST.md.
Commercial (Play Store prep)
All off by default. Enable only in Developer settings for internal testing.
| Item | Status |
|---|---|
CommercialFeatures gate |
Done |
InAppPurchaseCoordinator (Play Billing 7.x) |
Done (connects when dev IAP on; SKU placeholder) |
InAppAdCoordinator (placeholder, no AdMob SDK yet) |
Done |
PlayStoreIntegration (listing intent + in-app review API) |
Done |
| AdMob / unit IDs / banner layouts in main UI | TODO |
| Play Console products + privacy policy | TODO |
See COMMERCIAL.md. Pro/OSS module split: PRO_AAR.md (design).
Crash console open API
| Item | Status |
|---|---|
| Workflow triage tags + multi-tag (duplicate+fixed, etc.) | Done — OPEN_API.md |
GET /api/reports.php?tag=…&tag_mode=and|or |
Done |
ingest.source / run metadata in payload |
Design — OPEN_API.md |
| List filters + synthetic tagging | TODO |
| API key upload auth (per company) | TODO |
Stream protection (FEC / NACK)
| Item | Status |
|---|---|
GF(256) Reed–Solomon + ProtectionEnvelope v1 (monolithic) |
Done |
v2 per-shard FEC (FecShardWire, one ACUD message per RS shard) |
Done |
NACK + RetransmitCache + MSG_NACK |
Done |
| Post-handshake negotiation | Done |
| Backward compat (defer FEC until negotiated; ignore foreign FEC/NACK) | Done |
| Default protection NONE (stable cast) | Done |
Integration tests (FecShard*, UdpCastTransportFecTest) |
Done |
| Lab soak under loss (HY300 / BL6000) | TODO (manual) |
| NACK rate limit / backoff | Done (NackRateLimiter) |
MSG_FEC_NACK by groupId (optional) |
Deferred |
Enable in Settings → Stream protection (UDP) on both sender and receiver, then reconnect.
libvpx / Opus / Speex
| Item | Status |
|---|---|
libandroidcast_codecs.so + JNI probes |
Done |
Cross-compile libvpx.a (scripts/build-native-codecs.sh) |
Done |
JNI encode/decode in libvpx_bridge.c |
Done (when libvpx.a linked per ABI) |
LibvpxVideoEncoderSink (surface + buffer) |
Done |
libvpx decoder on receiver (LibvpxCapableVideoDecoder) |
Done |
| Surface → libvpx without MediaCodec passthrough on cast | Done (ImageReader) |
Opus / Speex cross-compile + CMake autolink (build-native-codecs.sh) |
Done |
| Opus / Speex JNI encode/decode sinks | TODO |
See ndk/README.md.
Transports & protocols
| Transport | Status |
|---|---|
| UDP (default) | Done |
| TCP | Done |
| QUIC (Cronet, experimental) | Partial |
| WebRTC | Stub (WebRtcCastTransport) |
USB tether (usb_tether) |
Stub — dev settings only |
Receiver / sender UX
| Item | Status |
|---|---|
ReceiverPlaybackActivity (primary receiver UI) |
Done |
| Settings drawer + themes + RU locale | Done |
| Multi-receiver 1:N | Done (gated off while ALPHA_FEATURE_FREEZE) |
Legacy ReceiverActivity in manifest |
Orphan — remove or wire |
| Immersive A/V presets (dev) | Experimental |
| Sender resolution UI modes (dev: Separated / Legacy / Combined) | Done (test) |
| True dual-stream encode (480p + 720p simultaneous) | Deferred |
Deferred / post-alpha
- Internet relay gateway
- TLS on cast stream
- Passthrough video codec
- Lab automation under simulated loss
- Full wired-HDMI capture (roadmap D phase 2)
- USB-tether cast production path (roadmap E)
Related docs
- README.md — documentation index (all
docs/*.mdwith section links) - GIT_FLOW.md — green
master/nextdevelopment cycle (PDF) - INFRA.md — production FE/BE topology
- ../README.md — repo quick start
- ALPHA.md — alpha freeze & QA sign-off
- USB_HDMI_CAST.md — D & E
- COMMERCIAL.md — ads / IAP / Play
- PRO_AAR.md — cast-core / cast-pro entitlements
- OPEN_API.md — crash ingest triage API
- OTA.md — backend layout v0
- BUILD_DEPLOY.md — Docker build, staging OTA, deploy flow
- CRASH_REPORTER.md — crash upload
- GRAFANA_vs_others_graphvis_pivot.md — graphs dashboard pivot
- 20260602_REVERSE_SSH_proposals_summary.md — on-demand remote access
- AV_QUALITY_QA_SESSION.md — AV quality enhancement Q&A