[Bug 25355] Move TextTrack.inBandMetadataTrackDispatchType to DataCue.type, and make it optional

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25355

--- Comment #1 from Aaron Colwell <acolwell@google.com> ---
I was under the impression that inBandMetadataTrackDispatchType was intended to
be like a MIME-type for track so that the web application could speculate about
the type of data to expect from the track w/o having to receive any actual
cues. I think this is a valuable thing to have and provides something we could
create a registry around that maps inBandMetadataTrackDispatchType to expected
cues exposed by the track.

I'm concerned about having type strings exposed here. What is the use case
where the UA can determine the type, but not actually be able to parse the data
it is returning? If it understands the type, it seems like it should be able to
return a type specific cue for it. Something like this amplifies my concern
that unspeced protocols will be allowed because this is starting to look like a
"hash map" type interface.

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Received on Wednesday, 16 April 2014 16:26:30 UTC