[Bug 733056] Send codec specific headers as bus messages from parser plugin

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=733056
  GStreamer | gst-plugins-bad | unspecified

--- Comment #19 from sreerenj <bsreerenj at gmail.com> 2014-07-29 23:05:42 UTC ---
(In reply to comment #16)
> I think the general approach makes sense as discussed on IRC.
> 
> (In reply to comment #11)
> 
> > --Individual header parsing will be requested via allocation query. And the
> > parser will always initiate an allocation query with NULL caps to avoid the
> > dependency of upstream-element initiation of allocation query.
> 
> Why an ALLOCATION query with NULL caps? You should know the caps at that point
> already. You would do the ALLOCATION query right after setting the caps on the
> srcpad.

parser will only set the src caps once it finishes the parsing of first frame.
We cannot delay till that point. So initiating the allocation query from
start() virtual method. Anyway we can still use the negotiated caps here. Is
there any requirement to make this caps as a fixed one?

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