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video-converter: Add fast paths from v210 to I420/YV12, Y42B, UYVY an…
…d YUY2

These then don't require going through the generic code path via AYUV64
first but can be converted directly.

This speeds up processing of
  videotestsrc ! v210 ! videoconvert ! other_format ! fakesink
by a factor of 1.55 for I420/YV12 and 1.40 for the other destination
formats and reduces memory pressure considerably.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/870>
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sdroege authored and tp-m committed Oct 14, 2020
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