SLNG plugin for LiveKit Agents
Support for SLNG's voice AI gateway in LiveKit Agents, providing access to multiple STT and TTS providers through a unified API.
See https://docs.slng.ai/ for more information.
Installation
pip install livekit-plugins-slng
Pre-requisites
You'll need an API key from SLNG. It can be set as an environment variable: SLNG_API_KEY
Usage
Pass an SLNG model identifier; the plugin connects through SLNG's Unmute Bridge and builds the endpoint itself.
from livekit.plugins import slng
stt = slng.STT(
model="deepgram/nova:3",
language="en",
)
tts = slng.TTS(
model="deepgram/aura:2",
voice="aura-2-thalia-en", # provider voice ID, required
language="en",
)
Additional keyword arguments are forwarded to the gateway and applied according to the selected model's contract. Failover across multiple models or endpoints is available via connections=[...]; see docs.slng.ai for details.
End of turn finalization
For the lowest STT turn latency, let the plugin know when the user stops speaking. The plugin then sends a finalize signal so the provider returns the final transcript immediately instead of waiting for its own endpointing:
session = AgentSession(stt=stt, ...)
stt.attach_to_session(session)
Or wire it manually:
@session.on("user_state_changed")
def _on_user_state_changed(ev):
stt.notify_user_state(ev.new_state)
Without this hook the plugin still works, but end of turn detection relies entirely on the provider's endpointing, which typically adds a few hundred milliseconds per turn.
Region override
The plugin supports gateway region routing via the region_override option on both STT and TTS.
This maps directly to the gateway's X-Region-Override header.
See the available regions at docs.slng.ai/region-override.
You can pass either a single region:
stt = slng.STT(
api_key="your-slng-api-key",
model="deepgram/nova:3",
region_override="eu-west-1",
)
Or multiple preferred regions in priority order:
tts = slng.TTS(
api_key="your-slng-api-key",
model="deepgram/aura:2",
voice="aura-2-thalia-en",
region_override=["eu-west-1", "us-east-1"],
)
To constrain routing to a broad geographic zone instead of a specific region,
use world_part_override (for example "eu"), which maps to the gateway's
X-World-Part-Override header. region_override takes precedence when both
are set.
Migrating from 1.x
Version 2.0 is a breaking change:
- All traffic goes through the Unmute Bridge.
model_endpointandmodel_endpointswere removed; pass a model identifier orconnections=[...]instead. - STT no longer defaults to
model="deepgram/nova:3"; pass a model (orconnections) explicitly. - TTS
voiceis required and passed verbatim as the provider's voice identifier. - Language codes are no longer normalized client-side; send the value the model expects (for example BCP-47
hi-INfor Sarvam, nothi). - STT
recognize()(HTTP batch) is no longer supported; usestream(). Onlypcm_s16leinput audio is supported. api_tokenstill works on STT but is deprecated; useapi_key.
Metadata
Release files for livekit-plugins-slng 1.8.4
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
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|---|---|---|---|---|
| livekit_plugins_slng-1.8.4-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 67.5 kB
Release files / livekit_plugins_slng-1.8.4.tar.gz
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