[Bug 764201] Provide fast path for I420 to BGRA (and/or RGBA) conversion and back

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764201

--- Comment #3 from Wim Taymans <wim.taymans at gmail.com> ---
With I420 formats, quite a bit of time is spent in the restoration of the
chroma samples. You can disable that with:

chroma-mode=none on videoconvert. To compare:

gst-launch-1.0 videotestsrc ! imagefreeze ! video/x-raw,format=I420 !
videoconvert ! video/x-raw,format=BGR ! fakesink num-buffers=10000 
Execution ended after 0:00:02.915934335

gst-launch-1.0 videotestsrc ! imagefreeze ! video/x-raw,format=I420 !
videoconvert chroma-mode=3 ! video/x-raw,format=BGR ! fakesink
num-buffers=10000 
Execution ended after 0:00:01.964299628

And:

gst-launch-1.0 videotestsrc ! imagefreeze ! video/x-raw,format=BGRA !
videoconvert chroma-mode=0 ! video/x-raw,format=I420 ! fakesink
num-buffers=10000 
Execution ended after 0:00:02.046383592

gst-launch-1.0 videotestsrc ! imagefreeze ! video/x-raw,format=BGRA !
videoconvert chroma-mode=3 ! video/x-raw,format=I420 ! fakesink
num-buffers=10000 
Execution ended after 0:00:01.723934187

for comparison this is quite a bit faster:

gst-launch-1.0 videotestsrc ! imagefreeze ! video/x-raw,format=I420 !
videoconvert chroma-mode=0 ! video/x-raw,format=BGRA ! fakesink
num-buffers=10000 
Execution ended after 0:00:00.850462115

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