[Bug 722397] liveadder: handle gap buffer flag

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=722397
  GStreamer | gst-plugins-bad | git

--- Comment #3 from Michael Olbrich <m.olbrich at pengutronix.de> 2014-05-20 12:43:22 UTC ---
Oliver: I don't think so. What must happen is this:

- 'oldbuffer' is the current buffer that will be sent downstraem later.
- 'buffer' is the new data that should be added.

If 'buffer' has the GAP flag set, then we just do nothing. If it doesn't, 
then things get interesting:
If 'oldbuffer' doesn't have the GAP flags set, then we can just add the 
data and everything works just fine.
If 'oldbuffer' the GAP flag set, its data must be zero, so adding works 
just fine. However we must remove the GAP flag, or downstream may ignore 
the data we just added.
This is an adder, so the we can only sent a GAP buffer if _all_ input
buffers are GAP buffer.

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