--- gsd_state_version: 1.0 milestone: v1.0 milestone_name: milestone status: verifying stopped_at: Completed 05-live-show-execution/05-03-PLAN.md last_updated: "2026-04-07T10:19:03.026Z" last_activity: 2026-04-07 progress: total_phases: 7 completed_phases: 5 total_plans: 17 completed_plans: 17 percent: 0 --- # Project State ## Project Reference See: .planning/PROJECT.md (updated 2026-04-05) **Core value:** Load a song, build a synchronized light show, play it back live — with precise control over every effect on every device. **Current focus:** Phase 05 — live-show-execution ## Current Position Phase: 05 (live-show-execution) — EXECUTING Plan: 3 of 3 Status: Phase complete — ready for verification Last activity: 2026-04-07 Progress: [░░░░░░░░░░] 0% ## Performance Metrics **Velocity:** - Total plans completed: 0 - Average duration: — - Total execution time: 0 hours **By Phase:** | Phase | Plans | Total | Avg/Plan | |-------|-------|-------|----------| | - | - | - | - | **Recent Trend:** - Last 5 plans: — - Trend: — *Updated after each plan completion* | Phase 01-foundation P01 | 4 | 2 tasks | 23 files | | Phase 01-foundation P03 | 6 | 1 tasks | 9 files | | Phase 01 P04 | 2 | 2 tasks | 3 files | | Phase 02-audio-engine P01 | 525603 | 2 tasks | 5 files | | Phase 02-audio-engine P02 | 8 | 2 tasks | 3 files | | Phase 02-audio-engine P03 | 8min | 2 tasks | 5 files | | Phase 02-audio-engine P03 | 4 | 9 tasks | 8 files | | Phase 03-communication-protocol P01 | 4min | 2 tasks | 8 files | | Phase 03-communication-protocol P02 | 3min | 1 tasks | 10 files | | Phase 03-communication-protocol P03 | 2min | 2 tasks | 3 files | | Phase 04-timeline-editor P01 | 4min | 2 tasks | 5 files | | Phase 04-timeline-editor P02 | 9 | 2 tasks | 6 files | | Phase 04-timeline-editor P03 | 2 | 1 tasks | 3 files | | Phase 04-timeline-editor P04 | 4min | 2 tasks | 4 files | | Phase 05-live-show-execution P01 | 152 | 2 tasks | 1 files | | Phase 05-live-show-execution P02 | 20 | 2 tasks | 3 files | | Phase 05-live-show-execution P03 | 10 | 1 tasks | 1 files | ## Accumulated Context ### Decisions Decisions are logged in PROJECT.md Key Decisions table. Recent decisions affecting current work: - Init: Web UI over TUI — richer DAW interactions while keeping terminal aesthetic via CSS - Init: python-mpv-jsonipc preferred over ctypes binding — no libmpv.dll dependency on Windows - Init: Firmware deferred to Phase 7 — protocol must be validated against simulator first - Init: undo/redo built in Phase 4 — retrofitting command pattern is expensive - [Phase 01-foundation]: Module-level state in main.py for registry/show_store — acceptable for Phase 1, Phase 2 migrates to Depends() - [Phase 01-foundation]: StaticFiles mounted last in create_app() — prevents catch-all interception of /api/* routes - [Phase 01-foundation]: encode_animation_cmd stubs return b'' — Phase 3 implements real UDP animation command encoding - [Phase 01-foundation]: redirect_slashes=False on FastAPI — StaticFiles at root intercepted API redirects - [Phase 01-foundation]: API collection routes use empty-string paths ('') not '/' — canonical /api/devices without redirect - [Phase 01]: window.removeDevice export required for ES module onclick compatibility — functions in type=module scripts are not global - [Phase 01]: CSS accent variable canonical naming: --accent is source of truth, aliases are text-accent and border-bright - [Phase 02-audio-engine]: MPV_AO env var controls audio output — null default for Docker server mode, overridable for local dev - [Phase 02-audio-engine]: 10Hz polling via time.sleep(0.1) over observe_property — observe_property fires per audio frame overwhelming asyncio - [Phase 02-audio-engine]: apply_timer_fix() as Linux no-op — timeBeginPeriod is Windows-only; INF-03 satisfied as platform-guarded stub - [Phase 02-audio-engine]: broadcast_loop accepts get_engine callable instead of direct import — avoids ws.py/main.py circular import - [Phase 02-audio-engine]: asyncio.to_thread for engine.load in REST endpoint — python-mpv-jsonipc load is synchronous, must not block event loop - [Phase 02-audio-engine]: AUD-02 (YouTube URL loading) deferred to Phase 6 — noted in docstring, not implemented in audio.py - [Phase 02-audio-engine]: ffmpeg subprocess pipe for MP3 waveform extraction (libsndfile/soundfile does not support MP3 natively) - [Phase 02-audio-engine]: Transport state driven by WebSocket tick — no frontend polling - [Phase 02-audio-engine]: Browser plays audio via HTML5 audio element — eliminates python-mpv, Docker libmpv dependency, and server-side position polling - [Phase 02-audio-engine]: librosa.beat.beat_track for beat detection — tempo + beat grid in one call, cached in app.state.beats by filepath - [Phase 03-communication-protocol]: TDD approach for protocol encoders: tests committed RED before implementation, ensuring coverage is meaningful - [Phase 03-communication-protocol]: 0xAC animation command marker chosen well above WLED 0x01-0x04 range — no firmware collision - [Phase 03-communication-protocol]: UDPSender uses single shared asyncio DatagramTransport — no socket pool needed for UDP multi-device sends - [Phase 03-communication-protocol]: Chase reverse test uses offset-not-multiple-of-period for reliable assertion - [Phase 03-communication-protocol]: FireAnimation lazy-initializes heat array per led_count to support variable strip lengths - [Phase 03-communication-protocol]: asyncio.run() test pattern chosen over pytest-asyncio — not installed, plan provided this fallback - [Phase 03-communication-protocol]: UDPSender stopped before registry.save() in shutdown — orderly teardown, no sends after socket close - [Phase 04-timeline-editor]: Beats API uses 'beats' field not 'beat_times' — loadBeats() handles both with fallback - [Phase 04-timeline-editor]: TimelineCanvas auto-scroll at 80%/20% threshold — standard DAW follow behavior - [Phase 04-timeline-editor]: Revert-then-command pattern in _startMove: live drag updates block.timestamp for visual feedback; mouseup reverts to oldTimestamp then MoveBlockCommand executes — history always has correct before/after state - [Phase 04-timeline-editor]: setCurrentShowId() module-level function routes backend sync without coupling commands to app state - [Phase 04-timeline-editor]: BeatGrid stores raw beat_times unmodified — calibrationOffset subtracted only at getCalibratedBeats()/snap() time — offset slider works without corrupting base data - [Phase 04-timeline-editor]: BeatGrid.load() normalizes API field variants: beats/beat_times and tempo/tempo_bpm — actual API returns 'beats'/'tempo' not the plan's expected field names - [Phase 04-timeline-editor]: UpdateParamsCommand uses currentShowId (module-level var) not this._showId — matches existing command pattern in commands.js - [Phase 04-timeline-editor]: Color input fires 'change' not 'input' to create command — avoids flooding command history during native color picker drag - [Phase 05-live-show-execution]: WebSocket cue scheduler: LOOKAHEAD=60ms inline in tick handler, is_playing gate prevents pause/seek fires, seek rebuilds fired_ids via set comprehension - [Phase 05-live-show-execution]: active_cue tracks already-fired blocks within duration window so preview stays lit; past-cue threshold 100ms for silent skip without UDP dispatch - [Phase 05-live-show-execution]: Preview panel starts hidden (display:none), revealed to flex on show load — avoids empty panel before first show - [Phase 05-live-show-execution]: Strip color uses raw RGB from cue params, not CSS variables — data-driven per UI-SPEC Color section - [Phase 05-live-show-execution]: e.preventDefault() called first in every key branch — suppresses browser defaults before app logic - [Phase 05-live-show-execution]: Space on button elements explicitly skipped — prevents double-toggle with native button click - [Phase 05-live-show-execution]: Ctrl+S uses GET-then-POST round-trip to save current server show state, not in-memory timeline ### Pending Todos None yet. ### Blockers/Concerns - Phase 2: python-mpv-jsonipc latency on Windows 11 under load is unbenchmarked — validate with timing harness in 02-01 - Phase 4: librosa MP3 loading path on Windows needs explicit validation (soundfile falls back to audioread which requires FFmpeg on PATH) - Phase 6: AI sync approach (LLM-assisted) has no reference implementation — treat as spike, not commitment ## Session Continuity Last session: 2026-04-07T10:19:03.021Z Stopped at: Completed 05-live-show-execution/05-03-PLAN.md Resume file: None Next action: `/gsd:plan-phase 1`