From ed1f0f33a236a3cc83f522b628d259b14d05cc9c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Olivier=20Cr=C3=AAte?= <olivier.crete@collabora.com>
Date: Fri, 26 Mar 2021 15:57:15 -0400
Subject: [PATCH] webrtcbin: Remember if a transceiver had a forced m-line

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2104>
---
 ext/webrtc/gstwebrtcbin.c      | 6 ++++++
 ext/webrtc/webrtctransceiver.h | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/ext/webrtc/gstwebrtcbin.c b/ext/webrtc/gstwebrtcbin.c
index 4d5e9215e7..a554a7bdb3 100644
--- a/ext/webrtc/gstwebrtcbin.c
+++ b/ext/webrtc/gstwebrtcbin.c
@@ -6281,6 +6281,12 @@ gst_webrtc_bin_request_new_pad (GstElement * element, GstPadTemplate * templ,
       gst_object_ref (pad));
   _add_pad (webrtc, pad);
 
+  if (lock_mline) {
+    WebRTCTransceiver *wtrans = WEBRTC_TRANSCEIVER (trans);
+    wtrans->mline_locked = TRUE;
+    trans->mline = serial;
+  }
+
   return GST_PAD (pad);
 }
 
diff --git a/ext/webrtc/webrtctransceiver.h b/ext/webrtc/webrtctransceiver.h
index 2f65b75593..3a2115fd15 100644
--- a/ext/webrtc/webrtctransceiver.h
+++ b/ext/webrtc/webrtctransceiver.h
@@ -48,6 +48,8 @@ struct _WebRTCTransceiver
   gboolean                 do_nack;
 
   GstCaps                  *last_configured_caps;
+
+  gboolean                 mline_locked;
 };
 
 struct _WebRTCTransceiverClass