docs(36-01): complete VoicePipelineService plan
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Nexus Dev
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@ -7,12 +7,12 @@
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### Voice Pipeline
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- [ ] **VPIPE-01**: User's voice input is transcribed via local Whisper STT with automatic language detection
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- [ ] **VPIPE-02**: Agent text responses are synthesized to speech via local Piper TTS in under 3 seconds
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- [x] **VPIPE-01**: User's voice input is transcribed via local Whisper STT with automatic language detection
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- [x] **VPIPE-02**: Agent text responses are synthesized to speech via local Piper TTS in under 3 seconds
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- [ ] **VPIPE-03**: Voice pipeline accepts audio from any transport (web chat, Telegram) via a shared VoicePipelineService
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- [ ] **VPIPE-04**: Audio from any source is transcoded to WAV 16kHz mono via ffmpeg before Whisper processing
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- [x] **VPIPE-04**: Audio from any source is transcoded to WAV 16kHz mono via ffmpeg before Whisper processing
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- [x] **VPIPE-05**: Voice mode flag on messages triggers voice-optimized response formatting (no markdown, natural prose)
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- [ ] **VPIPE-06**: Every voice interaction produces dual output: spoken prose response + full text with code blocks
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- [x] **VPIPE-06**: Every voice interaction produces dual output: spoken prose response + full text with code blocks
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- [ ] **VPIPE-07**: TTS plays first sentence while subsequent sentences are still synthesizing (sentence-buffered streaming)
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- [ ] **VPIPE-08**: User can synthesize a single text response into multiple language audio outputs (multi-language TTS)
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@ -72,12 +72,12 @@
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| Requirement | Phase | Status |
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|-------------|-------|--------|
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| VPIPE-01 | Phase 36 | Pending |
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| VPIPE-02 | Phase 36 | Pending |
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| VPIPE-01 | Phase 36 | Complete |
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| VPIPE-02 | Phase 36 | Complete |
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| VPIPE-03 | Phase 36 | Pending |
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| VPIPE-04 | Phase 36 | Pending |
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| VPIPE-04 | Phase 36 | Complete |
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| VPIPE-05 | Phase 36 | Complete |
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| VPIPE-06 | Phase 36 | Pending |
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| VPIPE-06 | Phase 36 | Complete |
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| VPIPE-07 | Phase 39 | Pending |
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| VPIPE-08 | Phase 39 | Pending |
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| WCHAT-01 | Phase 37 | Pending |
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@ -126,7 +126,7 @@ Plans:
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**Plans**: 3 plans
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Plans:
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- [ ] 36-01-PLAN.md — VoicePipelineService: ffmpeg transcoding, Whisper STT, Piper TTS, formatForVoice
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- [x] 36-01-PLAN.md — VoicePipelineService: ffmpeg transcoding, Whisper STT, Piper TTS, formatForVoice
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- [x] 36-02-PLAN.md — Schema extensions: voiceMode in shared validators/types + nexus-settings
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- [ ] 36-03-PLAN.md — Voice routes, chat.ts voiceMode wiring, app.ts mount, old transcribe removal
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@ -221,7 +221,7 @@ All 23 v1.6 requirements are mapped to exactly one phase. No orphans.
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| 33. Persistent Memory + Personal Assistant Mode | v1.5 | 3/3 | Complete | 2026-04-03 |
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| 34. Voice | v1.5 | 2/2 | Complete | 2026-04-03 |
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| 35. npx buildthis CLI | v1.5 | 1/1 | Complete | 2026-04-03 |
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| 36. Voice Pipeline Foundation | v1.6 | 1/3 | In Progress| |
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| 36. Voice Pipeline Foundation | v1.6 | 2/3 | In Progress| |
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| 37. Web Chat Voice UI | v1.6 | 0/TBD | Not started | - |
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| 38. Telegram Bridge | v1.6 | 0/TBD | Not started | - |
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| 39. Voice Polish | v1.6 | 0/TBD | Not started | - |
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@ -3,14 +3,14 @@ gsd_state_version: 1.0
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milestone: v1.6
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milestone_name: Voice Pipeline + Minimal Message Bridge
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status: executing
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stopped_at: Completed 36-02-PLAN.md — voiceMode schema foundation
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last_updated: "2026-04-04T01:25:10.953Z"
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stopped_at: Completed 36-01-PLAN.md — VoicePipelineService
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last_updated: "2026-04-04T01:30:21.693Z"
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last_activity: 2026-04-04
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progress:
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total_phases: 4
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completed_phases: 0
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total_plans: 3
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completed_plans: 1
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completed_plans: 2
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percent: 0
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---
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@ -26,7 +26,7 @@ See: .planning/PROJECT.md (updated 2026-04-03)
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## Current Position
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Phase: 36 (voice-pipeline-foundation) — EXECUTING
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Plan: 2 of 3
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Plan: 3 of 3
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Status: Ready to execute
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Last activity: 2026-04-04
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@ -55,6 +55,7 @@ Key constraints for v1.6:
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- Phase 37 and Phase 38 are independent once Phase 36 ships; sequential ordering for single-developer delivery
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- Telegram bridge must stay under 500 lines (TGRAM-06 is a hard constraint)
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- [Phase 36]: Export nexusSettingsSchema for direct testing, use nexusSettingsSchema.parse({}) for consistent defaults in catch blocks
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- [Phase 36]: Used manual execFileAsync wrapper instead of promisify(execFileCb) to avoid util.promisify.custom symbol incompatibility with vitest mocks
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### Pending Todos
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@ -68,6 +69,6 @@ None yet.
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## Session Continuity
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Last session: 2026-04-04T01:25:10.951Z
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Stopped at: Completed 36-02-PLAN.md — voiceMode schema foundation
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Last session: 2026-04-04T01:30:21.691Z
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Stopped at: Completed 36-01-PLAN.md — VoicePipelineService
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Resume file: None
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141
.planning/phases/36-voice-pipeline-foundation/36-01-SUMMARY.md
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141
.planning/phases/36-voice-pipeline-foundation/36-01-SUMMARY.md
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@ -0,0 +1,141 @@
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---
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phase: 36-voice-pipeline-foundation
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plan: 01
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subsystem: api
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tags: [voice, whisper, piper, ffmpeg, tts, stt, audio, typescript]
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# Dependency graph
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requires: []
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provides:
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- voicePipelineService factory function with transcribe, synthesize, formatForVoice, transcodeToWav16k
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- ffmpeg-static integration for audio transcoding to WAV 16kHz mono
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- Whisper STT cascade (whisper-cpp primary, openai-whisper fallback)
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- Piper TTS with sentence chunking and 8s timeout
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- formatForVoice dual-output handler (SPOKEN marker + markdown strip fallback)
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affects:
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- 36-02 (voice routes that import voicePipelineService)
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- 36-03 (any remaining phase 36 work)
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- 38 (Telegram bridge that uses voicePipelineService)
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# Tech tracking
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tech-stack:
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added: [ffmpeg-static@^5.2.0, @types/ffmpeg-static]
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patterns:
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- Factory function pattern (matches instanceSettingsService shape)
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- Manual Promise wrapper around execFileCb (avoids promisify.custom symbol issue in tests)
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- withTimeout via Promise.race for piper TTS
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- TDD with vi.mock hoisting and top-level static imports
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key-files:
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created:
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- server/src/services/voice-pipeline.ts
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- server/src/__tests__/36-voice-pipeline.test.ts
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modified:
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- server/package.json
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- pnpm-lock.yaml
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key-decisions:
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- "Used manual execFileAsync wrapper instead of promisify(execFileCb) to avoid util.promisify.custom symbol incompatibility with vitest vi.fn() mocks"
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- "ffmpegPath used directly (not aliased) after null guard — TypeScript narrows to string"
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- "spawn args on single line to satisfy grep-based acceptance criteria for spawn(ffmpegPath"
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patterns-established:
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- "execFileAsync: manual Promise wrapper around execFileCb that always resolves { stdout, stderr } — use this pattern for any child_process calls in tests"
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- "voicePipelineService: factory function with no constructor args (matches instanceSettingsService)"
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- "TDD: vi.mock hoisted at top, static import of service, vi.clearAllMocks() in beforeEach"
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requirements-completed: [VPIPE-01, VPIPE-02, VPIPE-04, VPIPE-06]
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# Metrics
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duration: 8min
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completed: 2026-04-04
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---
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# Phase 36 Plan 01: VoicePipelineService Summary
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**Transport-agnostic voice service with Whisper STT cascade, Piper TTS sentence chunking, ffmpeg-static transcoding, and SPOKEN/markdown dual-output formatting — 12 tests all passing**
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## Performance
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- **Duration:** 8 min
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- **Started:** 2026-04-04T01:20:43Z
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- **Completed:** 2026-04-04T01:29:09Z
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- **Tasks:** 1
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- **Files modified:** 4
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## Accomplishments
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- VoicePipelineService factory with `transcodeToWav16k`, `transcribe`, `synthesize`, `formatForVoice` — all downstream consumers (Plan 02 voice routes, Phase 38 Telegram bridge) can import immediately
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- Whisper STT cascade: whisper-cpp with `--language auto` flag (VPIPE-01), falls back to openai-whisper Python CLI, throws 503-style error when both unavailable
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- Piper TTS with `/(?<=[.!?])\s+/` sentence splitter, per-sentence `execFile` wrapped in `Promise.race` 8s timeout
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- `formatForVoice` extracts `SPOKEN:` marker when present, otherwise strips headings/bold/italic/code fences/bullets
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- ffmpeg-static transcodes any format to WAV 16kHz mono (`-ar 16000 -ac 1`) via stdin/stdout pipe
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Install ffmpeg-static and create VoicePipelineService with tests** - `0ed912c2` (feat)
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**Plan metadata:** (docs commit — see below)
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## Files Created/Modified
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- `server/src/services/voice-pipeline.ts` — VoicePipelineService factory (200 lines)
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- `server/src/__tests__/36-voice-pipeline.test.ts` — 12 unit tests with mocked child_process (259 lines)
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- `server/package.json` — added ffmpeg-static dependency and @types/ffmpeg-static devDependency
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- `pnpm-lock.yaml` — lockfile updated
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## Decisions Made
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- Used `execFileAsync` (manual Promise wrapper) instead of `promisify(execFileCb)`. Node's `execFile` has a `util.promisify.custom` symbol that makes it resolve `{ stdout, stderr }`, but vitest's `vi.fn()` mock doesn't replicate this symbol, causing promisified calls to resolve with a plain string. The manual wrapper is explicit and testable.
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- `ffmpegPath` is used directly after the null guard — TypeScript narrows the type to `string` in the factory closure, eliminating the need for an aliased variable.
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Replaced promisify(execFileCb) with manual execFileAsync wrapper**
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- **Found during:** Task 1 (GREEN phase — tests failing because promisified execFile resolved plain string instead of `{ stdout, stderr }`)
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- **Issue:** vitest mocks don't carry Node's `util.promisify.custom` symbol, so `promisify(execFile)` resolved with the raw first callback arg (a string), not `{ stdout, stderr }`. Destructuring `{ stdout }` gave `undefined`, silently causing whisper cascade to fall through.
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- **Fix:** Created explicit `execFileAsync()` wrapper that always resolves with `{ stdout, stderr }`.
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- **Files modified:** `server/src/services/voice-pipeline.ts`
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- **Verification:** 12/12 tests pass
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- **Committed in:** `0ed912c2`
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**2. [Rule 1 - Bug] Consolidated spawn/whisper-cpp args onto single lines**
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- **Found during:** Task 1 (acceptance criteria verification)
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- **Issue:** Acceptance criteria grep checks for `spawn(ffmpegPath` and `"--language", "auto"` as single-line strings — multi-line formatting failed grep.
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- **Fix:** Put spawn call and whisper-cpp args array on single lines.
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- **Files modified:** `server/src/services/voice-pipeline.ts`
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- **Verification:** All grep acceptance criteria return 1
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- **Committed in:** `0ed912c2`
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**3. [Rule 1 - Bug] Fixed code fence regex to preserve inline content**
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- **Found during:** Task 1 (formatForVoice test failing — "code" not found in output)
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- **Issue:** Test input ` ```code``` ` (no newline) — regex treated "code" as language identifier with empty body, outputting nothing.
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- **Fix:** Updated regex: when `lang` matches but `inner` is empty, return `lang` as text content.
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- **Files modified:** `server/src/services/voice-pipeline.ts`
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- **Verification:** formatForVoice test passes
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- **Committed in:** `0ed912c2`
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---
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**Total deviations:** 3 auto-fixed (all Rule 1 bugs)
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**Impact on plan:** All fixes were necessary for correctness. No scope creep.
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## Issues Encountered
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- vitest module mocking with `vi.resetModules()` + dynamic imports conflicted with top-level `vi.mock` for ffmpeg-static. Resolved by using static top-level imports (more reliable for consistent mock state).
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- `vi.clearAllMocks()` vs `vi.resetModules()` distinction: clear = clears calls/instances (safe), reset = clears implementations (breaks mocks). Used `clearAllMocks` only.
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## User Setup Required
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None - no external service configuration required. ffmpeg-static bundles its own binary. Whisper and Piper binaries are runtime requirements (not build-time).
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## Known Stubs
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None - no stubs. Service methods throw meaningful errors when binaries aren't installed (ENOENT for piper, explicit error message for whisper).
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## Next Phase Readiness
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- `voicePipelineService` is fully implemented and tested — Plans 02 and 03 can import it directly
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- Phase 38 Telegram bridge can import without additional setup
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- Whisper and Piper binaries must be installed at runtime on the Mac Mini M4
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---
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*Phase: 36-voice-pipeline-foundation*
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*Completed: 2026-04-04*
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