[Bug 747774] dashdemux: text streams support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=747774

--- Comment #16 from Chris Bass <floobleflam at gmail.com> ---
Yes, that's the plan (it's an EBU-TT-D rendering element, rather than SMPTE
TT).

It's pretty much ready; I'm just going through the process of getting
permission from my employer to release it.

How to integrate it will require some discussion. At the moment it's split into
two elements - a parser and a renderer - with a library defining types used to
exchange data between the parser and renderer.

The parser element is an extension to subparse. The changes are fairly
self-contained, consisting of a new file containing functions that handle
EBU-TT-D, and some minimal changes to gstsubparse.c

The renderer element is a modified version of basetextoverlay; so how best to
integrate that might be a bit more complicated.

Anyway, my plan is to put the code up on github first, and then we can work out
what to do from there.

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