[Bug 747774] dashdemux: text streams support

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Chris Bass <floobleflam at gmail.com> ---
Created attachment 307900
  --> https://bugzilla.gnome.org/attachment.cgi?id=307900&action=edit
Create pads for subtitle streams.

In the DVB DASH profile, Representations that carry timed text subtitles (or
the AdaptationSet containing those Representations) carry the attribute
codecs="stpp". The code in the patch checks whether application/mp4 streams
have this codec value set. If so, it creates a subtitle src pad; if not, no pad
is created for the stream.

The "stpp" codec type is defined at http://www.mp4ra.org/codecs.html to
indicate timed text subtitles rather than just generic timed text; therefore,
I've called the created src pads "subtitle_X" rather than "text_X".

As regards the caps of the pads, what's needed is a new caps type that
represents "timed text encapsulated in ISO BMFF". I've struggled to think of
the best name for this; in the end I've gone with application/x-mp4-text.

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