alexei.dolgolyov
2240471b67
Demo mode provides a complete sandbox environment with: - Virtual capture engine (radial rainbow test pattern on 3 displays) - Virtual audio engine (synthetic music-like audio on 2 devices) - Virtual LED device provider (strip/60, matrix/256, ring/24 LEDs) - Isolated data directory (data/demo/) with auto-seeded sample entities - Dedicated config (config/demo_config.yaml) with pre-configured API key - Frontend indicator (DEMO badge + dismissible banner) - Engine filtering (only demo engines visible in demo mode) - Separate entry point: python -m wled_controller.demo (port 8081) Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
48 lines
2.0 KiB
Markdown
48 lines
2.0 KiB
Markdown
# Phase 3: Virtual Audio Engine
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**Status:** ⬜ Not Started
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**Parent plan:** [PLAN.md](./PLAN.md)
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**Domain:** backend
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## Objective
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Create a `DemoAudioEngine` that provides virtual audio devices and produces synthetic audio data, enabling audio-reactive visualizations in demo mode.
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## Tasks
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- [ ] Task 1: Create `server/src/wled_controller/core/audio/demo_engine.py` with `DemoAudioEngine` and `DemoAudioCaptureStream`
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- [ ] Task 2: `DemoAudioEngine.ENGINE_TYPE = "demo"`, `ENGINE_PRIORITY = 1000`
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- [ ] Task 3: `is_available()` returns `True` only when `is_demo_mode()` is True
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- [ ] Task 4: `enumerate_devices()` returns 2 virtual devices:
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- "Demo Microphone" (input, not loopback)
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- "Demo System Audio" (loopback)
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- [ ] Task 5: `DemoAudioCaptureStream` implements:
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- `channels = 2`, `sample_rate = 44100`, `chunk_size = 1024`
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- `read_chunk()` produces synthetic audio: a mix of sine waves with slowly varying frequencies to simulate music-like beat patterns
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- Returns proper float32 ndarray
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- [ ] Task 6: Register `DemoAudioEngine` in `audio/__init__.py`
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## Files to Modify/Create
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- `server/src/wled_controller/core/audio/demo_engine.py` — New file: DemoAudioEngine + DemoAudioCaptureStream
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- `server/src/wled_controller/core/audio/__init__.py` — Register DemoAudioEngine
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## Acceptance Criteria
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- `DemoAudioEngine.is_available()` is True only in demo mode
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- Virtual audio devices appear in audio device enumeration when in demo mode
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- `read_chunk()` returns valid float32 audio data that varies over time
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- Audio analyzer produces non-trivial frequency band data from the synthetic signal
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## Notes
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- Synthetic audio should produce interesting FFT results (multiple frequencies, amplitude modulation)
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- Keep it computationally lightweight
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- Must conform to `AudioCaptureStreamBase` interface exactly
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## Review Checklist
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- [ ] All tasks completed
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- [ ] Code follows project conventions
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- [ ] No unintended side effects
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- [ ] Build passes
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- [ ] Tests pass (new + existing)
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## Handoff to Next Phase
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<!-- Filled in after completion -->
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