[Bug 793624] debugutilsbad: Add fakevideosink a fakesink that can do zero-copy

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793624

--- Comment #3 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Also, the handoff could in theory be proxied if needed, I just don't think it
is very important to have it in a first iteration. Though the semantic will be
different, since buffers might not be mappable, and there might be a
GstVideoMeta (different padding).

If this method is ok, I'd like to use the same trick to wrap filesink into
videofilesink. That's for the mappable case where you want to store image with
their original padding (for debugging purpose, also useful to generate tests
samples to be used with rawvideoparse). Note that the property proxying trick
is not applicable to the GL wrappers. You need the child soon in the process,
otherwise the properties won't be visible through gst-inspect-1.0.

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