From 33c7af8845c9f53c21c0c3f8ca20e26b58346317 Mon Sep 17 00:00:00 2001
From: Mathieu Duponchelle <mathieu@centricular.com>
Date: Tue, 29 May 2018 13:03:54 +0200
Subject: [PATCH] webrtcbin: copy sticky events on our ghostpads

This lets users call gst_pad_get_current_caps on newly-added
pads to easily determine what to plug them into.

We cannot copy sticky events unconditionally in core,
see #719437

https://bugzilla.gnome.org/show_bug.cgi?id=796387
---
 ext/webrtc/gstwebrtcbin.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/ext/webrtc/gstwebrtcbin.c b/ext/webrtc/gstwebrtcbin.c
index a28b9364d7..233cb99cbd 100644
--- a/ext/webrtc/gstwebrtcbin.c
+++ b/ext/webrtc/gstwebrtcbin.c
@@ -3289,6 +3289,17 @@ gst_webrtc_bin_get_transceivers (GstWebRTCBin * webrtc)
   return arr;
 }
 
+static gboolean
+copy_sticky_events (GstPad * pad, GstEvent ** event, gpointer user_data)
+{
+  GstPad *gpad = GST_PAD_CAST (user_data);
+
+  GST_DEBUG_OBJECT (gpad, "store sticky event %" GST_PTR_FORMAT, *event);
+  gst_pad_store_sticky_event (gpad, *event);
+
+  return TRUE;
+}
+
 /* === rtpbin signal implementations === */
 
 static void
@@ -3333,6 +3344,7 @@ on_rtpbin_pad_added (GstElement * rtpbin, GstPad * new_pad,
 
     if (webrtc->priv->running)
       gst_pad_set_active (GST_PAD (pad), TRUE);
+    gst_pad_sticky_events_foreach (new_pad, copy_sticky_events, pad);
     gst_element_add_pad (GST_ELEMENT (webrtc), GST_PAD (pad));
     _remove_pending_pad (webrtc, pad);