We use BCM4375 bluetooth (ap6275 chipset) on IMX8MP Android 11, and modified BT HAL to hardware/broadcom/libbt to make it work.
BT A2DP transmission works fine. (headphone without mic) , in/out BT audio transmit without problem.
BT SCO HFP : (headset with microphone)
While IMX8MP-AP6275 connected to a headset and use ZOOM app to make call with ZOOM software on PC ,
Audio output from headset has lot of noise (data transmit from PC) , it sounds like under-sampled and very low frequency sound.
My headset is not support WBS , so SCO rate is set at 8K , instead of 16k while running HFP.
I've tried to resample rates in tinyalsa_hal.cpp but it's not work.
( create_resampler with 8k in start_output_stream while AUDIO_DEVICE_OUT_ALL_SCO)
Is audo & BT HAL of iMX8mp support HFP while WBS disabled?
Is there any patches to make it works properly?
Attachment are modified patches for disable WBS and add SCO interface.
