[Bug 742385] video/audio encoders/decoders: need API to determine when to copy over GstMetas and when to drop them

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=742385

--- Comment #27 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 306290
  --> https://bugzilla.gnome.org/attachment.cgi?id=306290&action=edit
videodecoder: Add transform_meta() vfunc with default implementation

The default implementation copies all metadata without tags, and metadata
with only the video tag. Same behaviour as in GstVideoFilter.

This currently does not work if the ::parse() vfunc is implemented as all
metas are getting lost inside GstAdapter.

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