[Bug 792983] gst-plugins-base 1.12 fails to read UTF-8 encoded id3v2 tags

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792983

--- Comment #3 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 368263
  --> https://bugzilla.gnome.org/attachment.cgi?id=368263&action=edit
id3v2: Handle different extended header sizes

the various id3v2 specs handle the extended header sizes differently
(because hey, it wouldn't be fun otherwise).

http://id3.org/id3v2.3.0 states:
"Where the 'Extended header size', currently 6 or 10 bytes, excludes
 itself."

http://id3.org/id3v2.4.0-structure states:
  Extended header size   4 * %0xxxxxxx
     Number of flag bytes       $01
     Extended Flags             $xx

   Where the 'Extended header size' is the size of the whole extended
   header, stored as a 32 bit synchsafe integer. An extended header can
   thus never have a size of fewer than six bytes.

So in id3v2.4.0 it's the *whole* extended header size (a-la ISOBMFF
atom), whereas in id3v2.3.0 it's the extended header size *excluding*
those 4 initial bytes.

And for other versions, god knows..

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