[webrtcbin] Is set-local-description synchronous?

[Rob Agar]

Basically is this OK?

//setlocaldescription 
g_signal_emit_by_name(webrtc,"set-local-description",offer, NULL);

//notifylistenertosendoffersignal
gchar*description=gst_sdp_message_as_text(offer->sdp);
LOG(description)
listener->onLocalOffer(description);
g_free(description);

Or should we be passing a non-null promise argument, and only proceeding 
to send the offer when it notifies?

cheers

Rob
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