How to capture audio with libusb?

[Rosalyn463]

I know that there are already some questions which are similar to mine but they are old and doesn't helped me. I'm very new with libusb but I already come to the point where I get the libusb_device_handle. The Problem is that I don't know what the next step is. One part of my program is to capture audio from my FM radio stick. This stick sends audio over usb and has also an interface to change the frequency and so on.

With windows the stick is recognized as audio input device and I'm able to listen to that. My program should run on android 4.2 and above but my smartphone on which I want test my app does not support audio input devices over usb therefore I want to get it working with libusb.