give me livekit agents code, to use fallback for t...
# ask-aib
big-controller-60015
08/07/2025, 7:33 AMgive me livekit agents code, to use fallback for tts and stt
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tall-airline-16756
08/07/2025, 7:33 AMThanks for reaching out, Mohammed. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
tall-airline-16756
08/07/2025, 7:34 AMLiveKit provides FallbackAdapter implementations for both TTS (Text-to-Speech) and STT (Speech-to-Text) services. These adapters manage multiple service instances and include automatic failover capabilities. Here are the key features:
• STT FallbackAdapter:
◦ Automatically switches between STT instances if failures occur.
◦ Marks failed providers as unhealthy and stops sending requests to them.
◦ Periodically checks failed providers for recovery.
◦ Tracks provider status with availability change events.
• TTS FallbackAdapter:
◦ Handles multiple TTS instances with automatic failover.
◦ Resubmits failed requests to backup providers.
◦ Continues using backup providers until the primary recovers.
◦ Monitors provider health and availability in the background.
Both adapters include configurable retry policies, attempt timeouts, recovery mechanisms, and availability status tracking through events.
Sources: livekit-agents/livekit/agents/voice/agent_activity.py | Events and error handling | LiveKit Docs | Events and error handling | LiveKit Docs
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big-controller-60015
08/07/2025, 7:36 AMgive me the code itself, how to use fallback in livekit agents
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tall-airline-16756
08/07/2025, 7:36 AMHey there! Here's a friendly guide on how you can use the FallbackAdapter for TTS and STT in LiveKit agents. Let’s make sure your setup is smooth and reliable!
For TTS:
Copy code
from livekit.agents.tts import FallbackAdapter
from livekit.plugins.elevenlabs import TTS as ElevenLabsTTS
from livekit.plugins.groq import TTS as GroqTTS
tts_instances = [
ElevenLabsTTS(...), # Just configure these as you need
GroqTTS(...) # Same here, tailor to your setup
]
# Now, create the FallbackAdapter
tts_fallback = FallbackAdapter(
tts=tts_instances,
max_retry_per_tts=2,
sample_rate=48000 # Optional, adjust if you need a specific sample rate
) Copy code
from livekit.agents.stt import FallbackAdapter
from livekit.plugins.assemblyai import STT as AssemblyAISTT
from livekit.plugins.deepgram import STT as DeepgramSTT
stt_instances = [
AssemblyAISTT(...), # Configure these as you like
DeepgramSTT(...) # Same here, just set them up as needed
]
# Let’s create the FallbackAdapter for STT
stt_fallback = FallbackAdapter(
stt=stt_instances,
attempt_timeout=10.0, # How long to wait for each attempt
max_retry_per_stt=1, # How many times to retry per STT instance
retry_interval=5 # Time between retries
) Copy code
def on_availability_changed(event):
# This will let you know when STT or TTS availability changes
print(f"STT: {event.stt.label} is {'available' if event.available else 'unavailable'}")
stt_fallback.on("stt_availability_changed", on_availability_changed)
tts_fallback.on("tts_availability_changed", on_availability_changed)