[Bug 666247] teletextdec: add cache navigation functions

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=666247

Thomas Löwe <lazyt at mailbox.org> changed:

           What    |Removed                     |Added
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 Attachment #312003|needs-work                  |none
             status|                            |
 Attachment #312003|0                           |1
        is obsolete|                            |
 Attachment #326238|0                           |1
        is obsolete|                            |

--- Comment #18 from Thomas Löwe <lazyt at mailbox.org> ---
Created attachment 326324
  --> https://bugzilla.gnome.org/attachment.cgi?id=326324&action=edit
add cache navigation functions via navigation interface

Ok, here is the first try to implement it via the gstnavigation interface.

Hope I understand this right, at least it works here like before via the
properties version.

GST_NAVIGATION_COMMAND_UP: show next cached page
GST_NAVIGATION_COMMAND_DOWN: show prev cached page
GST_NAVIGATION_COMMAND_RIGHT: show next cached subpage
GST_NAVIGATION_COMMAND_LEFT: show prev cached subpage

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