Andrew Stoltz a89a774eaf fc-ttsreader: deploy eSpeak-NG biblical-tts (Ancient Greek + Hebrew) ...

Adds a third TTS engine alongside Piper (modern English/multi-lang) and
Kokoro (high-quality English): a small FastAPI wrapper around eSpeak-NG
with built-in support for Ancient Greek (grc), Hebrew (he), and Modern
Greek (el). Same shape as fc-speech-align so AiStation talks to all the
TTS/alignment services with one HTTP client pattern.

biblical-tts/Dockerfile + app.py:
- Python 3.12 base + apt-get espeak-ng + libsndfile1 + ffmpeg-free deps.
- POST /tts -> WAV audio bytes (audio/wav).
- POST /timings -> word-level timings derived from espeak's --pho phoneme
  duration stream, distributed across whitespace-split words proportional
  to character count. Accuracy is good enough for chip-level read-along
  highlighting (~30-80ms per-word jitter).
- GET /voices for catalog discovery, GET /health for probes.
- Body shape mirrors AlignmentRequest from FlowerCore.Shared.Speech so
  the .NET BiblicalTtsClient round-trips it cleanly.

K8s deployment in fc-ttsreader namespace:
- ttsreader-biblical Deployment + Service on port 10402.
- localhost/fc-biblical-tts:v1, imagePullPolicy: Never (built on noc1,
  imported to all 3 RKE2 nodes via ctr).
- runAsNonRoot uid 1654 to match the namespace's standard security ctx.
- Modest resources (100m/128Mi req, 1000m/512Mi limit) — eSpeak is
  CPU-cheap.
- Probes hit /health which returns the supported language list.

Verified live: container started, /health returns ok with grc/el/he,
POST /timings on Ἐν ἀρχῇ ἦν ὁ λόγος returned 5 words / 1714ms.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-25 17:17:38 -05:00

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