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Add Smallest AI TTS service integration

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Adds SmallestTTSService, a WebSocket-based TTS service using Smallest AI's
Lightning v3.1 model. Follows current Pipecat service conventions:

- SmallestTTSSettings dataclass with runtime-updatable settings (voice,
  language, speed, etc.)
- Reconnects on model change; keepalive every 30s to prevent idle timeout
- TTS settings default to None so the API applies its own defaults
- Model enum: SmallestTTSModel.LIGHTNING_V3_1

Includes a foundational example (07zl-interruptible-smallest.py) using
Deepgram STT + Smallest TTS + OpenAI LLM.

STT integration will follow in a separate PR once the hallucination/finalize
behaviour is resolved.

Made-with: Cursor
This commit is contained in:
Harshita Jain
2026-03-20 09:30:16 -07:00
committed by Mark Backman
parent dd45843c42
commit 099814d74a
5 changed files with 549 additions and 1 deletions
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