Most important part here is special-casing "device busy" so the application
is able to provide better feedback when another application is using the
device.
Original commit message from CVS:
* sys/winks/gstksclock.c (gst_ks_clock_worker_thread_func,
gst_ks_clock_start):
Synchronize KS clock as a single-shot operation for now, there's not
much point in doing it periodically until we're actually using the
KS timestamps for anything else than just discarding old frames.
* sys/winks/gstksvideosrc.c (gst_ks_video_src_open_device):
Provide the GstClock when opening the device if we already have one.
Original commit message from CVS:
* configure.ac:
* sys/Makefile.am:
* sys/winks/Makefile.am:
* sys/winks/gstksclock.c:
* sys/winks/gstksclock.h:
* sys/winks/gstksvideodevice.c:
* sys/winks/gstksvideodevice.h:
* sys/winks/gstksvideosrc.c:
* sys/winks/gstksvideosrc.h:
* sys/winks/kshelpers.c:
* sys/winks/kshelpers.h:
* sys/winks/ksvideohelpers.c:
* sys/winks/ksvideohelpers.h:
New plugin for low-latency video capture on Windows (#519935).
Uses Kernel Streaming, the lowest level API for doing video capture
on Windows (more or less just raw ioctls).
