[Bug 701110] videomixer: sinkpads GSList is not protected for multi-threading

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701110
  GStreamer | gst-plugins-good | git

--- Comment #13 from David Fernandez <d.fernandezlop at gmail.com> 2014-03-13 10:01:51 UTC ---
Created an attachment (id=271694)
 View: https://bugzilla.gnome.org/attachment.cgi?id=271694
 Review: https://bugzilla.gnome.org/review?bug=701110&attachment=271694

Patch to protect a critical variable values change

I think that this patch solves the race condition setting src_caps. Sometimes,
the function blend_buffers uses fill_color and its value is null because the
function src_setcaps set its to NULL out the lock.

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