Issue about audio_output from Matrix Creator

HI,

Sorry for keeping posting questions. I asked this question before but no effective answer.
I notice the developer released the code called audio_output under matrix_creator_hal. But I’m not sure how to run it.
After I make the folder and run the executable file using ‘./audio_output’, but it seems it won’t stop unless I press ctrl+c, and I didn’t hear anything from audio jack.
What does this file aim to do? And what is the correct procedure in order to make it work?