[Bug 775132] adaptivedemux: Download fragment only for activated stream

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775132

--- Comment #56 from Edward Hervey <bilboed at bilboed.com> ---
Took longer than I expected :) Anyway, I've put the WIP design doc here :
https://gitlab.freedesktop.org/bilboed/gst-docs/blob/master/markdown/design/scalable-codecs.md

It's aiming for the *bigger* picture (supporting scalable codecs), but also
contains design for:
* offloading stream-selection to any element (and not just decodebin3 itself)
* Properly notifying of stream selections
* Being able to inform upstream elements ASAP of incompatible/unusable streams
* Exposing "variants" of streams (like in adaptive demux).

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