Hi,
    Is there any api in ffmpeg which can send an usb control request? 
I can use the libusb's interface ( libusb_control_transfer() ) to accomplish 
this requirement, but this interface will cause the ffmpeg usb video streaming 
corrupt when i called it.
So, it is perfect if ffmpeg has such interface.
    The usb control request format is as:

    Best Regards
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