Function SoapySDRDevice_getBandwidthRange 

pub unsafe extern "C" fn SoapySDRDevice_getBandwidthRange(
    device: *const SoapySDRDevice,
    direction: c_int,
    channel: usize,
    length: *mut usize,
) -> *mut SoapySDRRange

Get the range of possible baseband filter widths.

\param device a pointer to a device instance \param direction the channel direction RX or TX \param channel an available channel on the device \param [out] length the number of ranges \return a list of bandwidth ranges in Hz