Bug fix audio_test.py and camera_ffplay_test.py demos

[mangdangroboticsclub]

Proposed change(s)

After this change, the following test demos can run successfully.
mini_pupper_bsp/demos/audio_test.py
mini_pupper_bsp/demos/camera_ffplay_test.py

Useful links (GitHub issues, forum threads, etc.)

Types of change(s)

• [* ] Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code refactor (non-breaking change which refactor the code)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update only
• Other (please describe)

Testing and Verification

To test audio_test.py,
cd ~/mini_pupper_bsp/demos
./audio_test.py:

To test camera_ffplay_test.py, please refer to
https://github.com/mangdangroboticsclub/mini_pupper_2_bsp/tree/main/RPiCamera

Test Configuration

Mini Pupper 2
Ubuntu 22.04

Checklist

• I have read the CONTRIBUTING guidelines.
• I have checked to ensure there aren't other open Pull Requests for the same change.

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