USB Isochronous

Hi, I am new to stm programming. I now need an application where i can send the isochronously from PC to device (I m working on f303re nucleo board). Couldn't find any information about how i can do that. I am creating a libusb CDC project and then i want to transfer my data so that i can send my data through I2S. I don't want to use USBAudio class as i do not want my device recognized as an audio device. Any help would be wonderful. Thanks