How can i port this i2s code to the new nrfx i2s api?

[Johnny]

https://github.com/takafuminaka/nRF52832/blob/master/i2s_ws2812b_demostration_planB/i2s_ws2812b_drive/i2s_ws2812b_drive.c

I read the documentation, but didn't really grasp how to use nrf_drv_i2s_next_buffers_set() or the approrpriate usage of NRFX_I2S_STATUS_NEXT_BUFFERS_NEEDED