BackgroundAudioPlayer cannot restart after being closed

[wdhwg001]

Bug Description

Hi Team,

In livekit-agents/livekit/agents/voice/background_audio.py,

method aclose closes:

            await self._audio_mixer.aclose()
            await self._audio_source.aclose()

But the start doesn't re-initialise them.

Our current workaround is to re-create the instance, but it'd be nice if this can be fixed.

Expected Behavior

The _audio_mixer and _audio_source should be initialised in start instead of __init__.

Reproduction Steps

.

Operating System

Any

Models Used

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Package Versions

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Session/Room/Call IDs

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Proposed Solution

Additional Context

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Screenshots and Recordings

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