[Bug 734679] videobox: Much slower than videocrop

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=734679

--- Comment #14 from Stirling Westrup <swestrup at gmail.com> ---
(In reply to Tim-Philipp Müller from comment #13)
> > We have written a one-pass video cropper,
> > scaler, rotator and color space converter.
> 
> Ah, so basically like the new video converter API in -base (plus rotation
> though).

I guess, although our algorithm is a heck of a lot simpler and involves no
matrices. We just have an AVX2-enabled loop in which we, for each output frame
pixel, read an input frame pixel, convert it to the output colorspace, and
write it out.

We have one such loop for each pair of colorspaces we support.

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