Matthew Heaney 2fc496a0d6 mkvparser: create generic track objects ...

Formerly, it was only possible to create instances of
the Track subclasses, VideoTrack and AudioTrack.  However,
we now populate WebM files with WebVTT metadata blocks,
so we must allow for a third kind of track object.

We now enable instances of type Track to be created,
by providing a new factory function, Track::Create, and
making all Track methods non-pure and with a generic
implementation.

Change-Id: I7d4c965eb566b9fc2f5ceefe1d43723cf8c1e5f0

2012-10-10 16:51:21 -07:00

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