[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 #20 from sreerenj <bsreerenj at gmail.com> 2014-07-29 23:13:35 UTC ---
>(In reply to comment #17)
> (In reply to comment #15) and substreaming, etc.).
>  
> Or, could we think about a flags based protocol? i.e.
> xxx_{FRAME,SLICE,MACROBLOCK} would be simpler to merge from all downstream
> requirements, up to including the parser element itself.
> 
> WDYT?

If the downstream needs codec specific meta from upstream parser , it should be
requested via capsnegotiation through specific capsfeatures. This is
implemented for mpegvideoparser. Tested with codecanalyzer.

If downstream needs specific header parsing  and corresponding meta for those
headers, it should be requested through allocation query. For mpegvideo the
structure name is "Gst.Meta.MpegVideo" and individual headers should be
requested through structure members like "parse-slice-header,
parse-copy-right-ext" etc.

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