AIC Voice Focus version update & concurrency safety issue on audio buffer.

[gkmngrgn]

Summary

• Fix BufferError: Existing exports of data: object cannot be re-sized that occurs in production when concurrent filter() or stop() calls interleave with an in-flight filter() holding a memoryview on the mutable _audio_buffer bytearray across await yield points.
• The fix snapshots the needed audio blocks into immutable bytes and trims the buffer before any await, so no memoryview (or any reference to the mutable bytearray) is held across async yield points.
• Add two regression tests that reproduce the exact concurrency scenarios: concurrent filter()/filter() interleaving and stop() during filter().

Problem

AICFilter.filter() created a memoryview on self._audio_buffer (a bytearray) and held it alive across await self._processor.process_async(...). In production with concurrent calls, another task could run filter() (calling _audio_buffer.extend()) or stop() (calling _audio_buffer.clear()) while the memoryview still exported the buffer, causing Python to raise:

    BufferError: Existing exports of data: object cannot be re-sized

It's not easy to reproduce locally because it requires concurrent async interleaving but wrote a test for simulate it.

Fix

Replace the memoryview on the mutable bytearray with a bytes snapshot taken before any await:

    blocks_data = bytes(self._audio_buffer[:total_size])
    self._audio_buffer = self._audio_buffer[total_size:]
    # all awaits below only reference the immutable blocks_data

The extra copy is negligible — typical block size is 320 bytes (10ms of 16kHz 16-bit audio).

[codecov]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/pipecat/audio/filters/aic_filter.py	0.00%	6 Missing ⚠️

Files with missing lines	Coverage Δ
src/pipecat/audio/filters/aic_filter.py	0.00% <0.00%> (ø)

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[markbackman]

LGTM! Thank you 🙇