[Bug 793715] rtspsrc: regression with streams marked as recvonly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=793715

--- Comment #12 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
Created attachment 369148
  --> https://bugzilla.gnome.org/attachment.cgi?id=369148&action=edit
rtspsrc: Ignore sendonly/recvonly attributes unless a backchannel is configured

This works around a bug in various ONVIF cameras that implement the
attributes the wrong way around. They still won't work with a
backchannel but at least normal playback will work for the time being.
It restores pre-1.14 behaviour where we would fail to preroll on any SDP
that lists a recvonly stream. For 1.16 a better solution should be
found.

The problem here is that the ONVIF spec has the meaning of the two
attributes the wrong way around in the examples, compared to RFC4566.

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