usb_video_class_specific_vs_interface_output_header_descriptor
const usb_video_class_specific_vs_interface_output_header_descriptor* descriptor
= (const usb_video_class_specific_vs_interface_output_header_descriptor*)_descriptor;
const struct usb_video_class_specific_vs_interface_output_header_descriptor::ma_controls*
= (const struct usb_video_class_specific_vs_interface_output_header_descriptor