Hey there! The

wait_for_playout

function in LiveKit is super handy—it makes sure all the queued audio finishes playing before moving on. It’s used in different parts of the system to keep audio in sync and avoid any awkward interruptions. Here’s a quick rundown of where it comes into play: • AudioOutput Class: Waits for previous audio segments to wrap up and then gives you a

PlaybackFinishedEvent

with info like where playback stopped and if anything was interrupted. • AudioSource Class: Makes sure all the audio data waiting in line gets played fully—great for handling audio buffers smoothly. • SpeechHandle Class: Waits until a whole speech turn is done, helping keep things flowing nicely in speech apps. • AgentPlayout Class (JavaScript SDK): Keeps audio playback in sync so nothing gets cut off while something else is playing. Here’s an example to give you a feel for it:

# In a function tool to end a call after the agent finishes speaking
@function_tool
async def end_call(self, ctx: RunContext):
    """Ends the current call after the agent finishes speaking."""
    await ctx.wait_for_playout()  # Wait for the agent to finish
    # Call API to delete the room
    ...

Basically, this function is a lifesaver for handling audio smoothly in LiveKit apps—it waits patiently for all the sound to finish so everything feels seamless. If you have any questions about it, just ask!