[Bug 730926] tags: expose ID3 private frame ("PRIV") data

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=730926
  GStreamer | gst-plugins-base | git

--- Comment #8 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2014-09-22 10:19:30 UTC ---
Yes, gst_tag_merge_use_first() is right.

The owner string should not be at the beginning of the buffer data. You call
this GST_TAG_PRIVATE_DATA, which is quite generic, so it should not contain
ID3-specific formatting. We may want to use it for other private data too (I'm
actually wondering if we don't have something for that already, I have a vague
memory we extracted similar things from matroska). The buffer should just
contain the actual private data, nothing else.

The tag type should probably be changed to a GstSample. Then the data can go
into the GstBuffer, and any extra information like the origin (id3 tag) and
owner can go into the GstStructure.

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