This function returns the ID of the Unit or Terminal to which this feature unit is connected. This function is only applicable to a feature unit. Prior to calling this function the entity object should be obtained by calling USB_HOST_AUDIO_V1_ControlEntityGetFirst, USB_HOST_AUDIO_V1_ControlEntityGetNext, or USB_HOST_AUDIO_V1_EntityObjectGet.

uint8_t USB_HOST_AUDIO_V1_FeatureUnitSourceIDGet(
    USB_HOST_AUDIO_V1_OBJ audioObj, 
    USB_HOST_AUDIO_V1_CONTROL_ENTITY_OBJ entityObject
);

The ID of the unit or terminal to which this feature unit is connected.

None.