When I run generate_reply, how can I wait until th...
# ask-ai
p
When I run generate_reply, how can I wait until the user finishes speaking before releasing the handle?
t
Thanks for reaching out, Mario. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.
I'm glad you're looking to wait until the user finishes speaking before releasing the handle when using
generate_reply
. Let me guide you through how you can do this smoothly with LiveKit's turn detection features: • Use Turn Detection: LiveKit is designed to automatically recognize when a user has finished speaking by using Voice Activity Detection (VAD) or a turn detection model. The
on_user_turn_completed
callback is your go-to spot—it gets triggered right when the user's turn is done. This is the perfect moment to call
generate_reply
. • Configure Turn Detection: You have the flexibility to tweak settings like
min_endpointing_delay
(which defaults to 0.5 seconds) to make the detection just right for your needs. For example:
session = AgentSession(turn_detection="vad", min_endpointing_delay=0.5)
Call
generate_reply
After Turn Completion:
Simply use the
on_user_turn_completed
event to kick off the reply generation. Here's a handy example:
Copy code
@session.on("user_turn_completed")
async def on_user_turn_completed(chat_ctx, user_message):
    handle = session.generate_reply(instructions="Respond naturally.")
    await handle
Wait for Agent Playback: If you want to make sure the agent finishes speaking before moving on, just use the
SpeechHandle
returned by
generate_reply
and call
await handle
. By following these steps, you'll be able to create a smooth and natural conversation flow in your app. If you have any questions or need further help, feel free to ask—I'm here to support you! Sources: How does end-of-utterance detection work in conversations? | VoicePipelineAgent | LiveKit Docs | livekit-agents/livekit/agents/voice/speech_handle.py | Voice activity detection (VAD) parameters | LiveKit Docs | Agent speech and audio | LiveKit Docs
p
That makes sense; however, is it possible to await on the handle, so that it resolves the future only when the user finishes speaking? Or this is only for agent speech?
t
Thanks for reaching out! The
SpeechHandle
in LiveKit is actually designed to help manage and track agent speech specifically, rather than user speech. It’s great for awaiting the completion of agent speech using methods like
waitForPlayout()
or
done()
, but it doesn’t support waiting for user speech to finish. To detect when a user has finished speaking, LiveKit uses tools like Voice Activity Detection (VAD) or turn detection models, which then trigger events such as
on_user_turn_completed
. These work independently from the
SpeechHandle
. If you’d like me to walk you through this further or if you have any other questions, please don’t hesitate to ask—I’m here to help! Sources: livekit-agents/livekit/agents/voice/agent_activity.py | Agent speech and audio | LiveKit Docs | agents/src/voice/agent_activity.ts