usb sound card microphone functionality

[AnkitBhasin10]

I am trying to create a microphone functionality using existing usb sound card functionality. I have done some minor changes that makes it appear as usb microphone instead of sound card by changing the endpoints and input output terminal types. What changes required so that it takes input from microphone and send it to host its connected to.

[AnkitBhasin10]

UPDATE : Able to enumerate the device as both headset and microphone. Audio output works fine but sadly there is no audio input functionality.