[Bug 691712] [API] codecparsers: add GstMetas to pass parsing results downstream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=691712
  GStreamer | gst-plugins-bad | git

--- Comment #6 from sreerenj <bsreerenj at gmail.com> 2013-07-15 12:47:44 UTC ---
Okay,, So if the downstream supports only frame_level api then the parser
doesn't need to parse all the slices since it is bit expensive. And if the
downstream supports slice_level api, then the parser should parse every slices.

METHOD1:
--------------
How about splitting GstMpegVideoMeta in to two Metas:

--The GstMpegVideoMeta for all the generic headers like seq_hdr, pic_hdr etc

--The GstMpegVideoSliceMeta to keep an array of GstMpegVideoSliceHdr and
slice_offsets

So as per the request from downstream elements, parser can add the necessary
metas:

METHOD2:
--------------
Otherwise we can use an API specific parameter need_slice_parsing.
So the downstream elements which need to get the slice information should add
"need_slice_parsing=TRUE" to the GstStructure field @parm in
gst_query_add_allocation_meta().

And we can keep an array of GstMpegVideoSliceS with in GstMpegVideoMeta to
store both GstMpegVideoSliceHdr and slice_offset.

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