[Bug 745042] utils: Add gst_bin_sync_children_states()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745042

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #297701|none                        |needs-work
             status|                            |

--- Comment #2 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Review of attachment 297701:
 --> (https://bugzilla.gnome.org/review?bug=745042&attachment=297701)

::: gst/gstutils.c
@@ +3091,3 @@
+  gboolean success = TRUE;
+
+  it = gst_bin_iterate_elements (bin);

As discussed, this should use gst_bin_iterate_sorted(). Otherwise we might
change elements states in the wrong order: activate an upstream element, which
sends data to a deactivated downstream elements, then gets GST_FLOW_FLUSHING
and stops.

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