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v4l2: add uvcsink element

Michael Grzeschik requested to merge mgrzeschik/gstreamer:ml/topic/uvc into main

v4l2: add uvcsink element

This patch adds an element to stream video data to an uvc video gadget. The element handles the uvc events STREAMON, STREAMOFF, SETUP and DATA. to start, stop and configure the video buffer flow by the use of pad probes.

It works with linux kernels of versions higher than v6.1.

The element makes use of the v4l2sink proxy property v4l2sink::device to locate the corresponding device to parse the configfs for additional data.

Edited by Michael Grzeschik

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