Replace per-frame hsl(val*120) with a static createLinearGradient
(green->yellow->red, bottom to top) shared across all bars. Colour is
now position-based, not amplitude-based, so it never flickers. Peak
decay slightly slower (0.008/frame) for smoother hold.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Three modes on canvas click:
viz -> spectrum analyser (default)
actual -> hh:mm:ss elapsed in white, ELAPSED label
remaining -> -hh:mm:ss countdown in accent red, REMAINING label
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Time display now shows elapsed / -remaining instead of elapsed / total,
matching the Delphi original (reversetime mode). Progress-bar click seek
derives total from current + remaining to stay correct.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
sw.js uses __BUILDVER__ token; build.ps1 replaces it with the git
version before go build (which embeds the patched file), then restores
the template via the finally block. Installed PWA clients receive new
assets after every release.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Playlist browser:
- GET /api/playlist returns all track titles via ReadProcessMemory
- WS command {cmd:jump, index:N} jumps to track (0-based)
- Full-screen overlay with scrollable list
- Current track highlighted, auto-scrolls into view on open
- Live highlight update when track changes while panel is open
PWA:
- manifest.json with standalone display + theme colour
- sw.js: cache-first service worker for shell files
- icon.svg: music-note icon on dark background
- Apple/Android meta tags for Add to Homescreen
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Canvas / viz:
- Idle animation when Winamp stopped/paused: slow sine-wave breathing
across bars at low amplitude, dim colours — canvas is never dead-black
- 'PLAY' label overlay when stopped, 'NO SIGNAL' when WS disconnected
- hasSignal check: viz data must be < 1.5s old AND Winamp playing
- DPR resize uses Math.round() to avoid sub-pixel canvas size mismatch
- Peak indicators fade quickly in idle mode
winamp.go:
- GetPosition: clamp 0xFFFFFFFF sentinel at source (> 0xF0000000 → 0)
instead of in server.go; also removed redundant clamp from statusMsg
- GetTitle: use strings.LastIndex/Index instead of hand-rolled helpers
Returns empty string when window title is just 'Winamp' (stopped/empty)
Playlist prefix strip is now bounded (dot <= 4) so track titles with
'. ' in them are not accidentally trimmed
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
WebSocket (/ws):
- Replaces 2s HTTP polling with persistent WS connection
- Server pushes status updates every 500ms to all clients
- Server pushes FFT spectrum frames at ~30fps
- Bidirectional: client sends commands as JSON ({cmd, delta, level, ...})
- Auto-reconnect on disconnect (3s backoff)
- Status pushed immediately on connect
Visualisation (internal/viz/capture.go):
- WASAPI loopback capture via IAudioClient (same COM approach as volume)
- Captures whatever is playing through the default render device
- 2048-sample Hanning-windowed FFT (pure Go, no deps)
- 64 log-spaced bars, 40Hz-20kHz
- Fast attack / slow decay smoothing per bar
Canvas renderer (app.js):
- requestAnimationFrame loop, DPR-aware resize
- Green->yellow->red HSL gradient by amplitude
- Peak-hold indicators with 1.2%/frame decay
- Graceful: canvas stays dark if no viz data (Winamp paused/stopped)
Architecture:
- internal/server/hub.go: gorilla/websocket hub (register/broadcast/unregister)
- internal/server/server.go: full //go:build windows, REST API kept for debug
- frontend uses WS for all commands, REST only for killist list fetch
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- internal/volume: IAudioEndpointVolume via COM (pure Go, no CGO)
- Get/Set master volume (0-100%)
- GetMute/SetMute
- Uses WASAPI instead of deprecated MMSystem mixer API
- server: /api/volume now uses system volume (0-100, was Winamp 0-255)
- server: new /api/mute endpoint (GET + POST ?muted=true|false)
- server: volume+mute included in /api/status response
- frontend: mute button with visual state (🔊/🔇, red bar when muted)
- frontend: volume display as percentage label
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Jan Svabenik