From: gregor herrmann <gregor@toastfreeware.priv.at>
Date: Wed, 1 Jul 2020 21:17:56 +0000 (+0200)
Subject: Improve ICE message we send.
X-Git-Url: https://git.toastfreeware.priv.at/toast/stream2beamer.git/commitdiff_plain/7fc8b5a1f9425a11ccf996b578ca5f907722d786

Improve ICE message we send.

- Dynamically set sdpMid, like browsers do.
- Send a usernameFragment, parsed from the sdp message.
---

diff --git a/laplace_client.py b/laplace_client.py
index 6ec2bb8..1b9c8f0 100755
--- a/laplace_client.py
+++ b/laplace_client.py
@@ -31,6 +31,7 @@ class WebRTCClient:
         self.ssl_context.verify_mode = ssl.CERT_NONE
         self.websocket = None
         self.session_id = None
+        self.userfragments = []
 
     def send_sdp_offer(self, offer):
         text = offer.sdp.as_text()
@@ -57,6 +58,9 @@ class WebRTCClient:
         promise.interrupt()
         self.send_sdp_offer(offer)
 
+        sdp = offer.sdp
+        self.userfragments = [sdp.get_media(i).get_attribute_val('ice-ufrag') for i in range(sdp.medias_len())]
+
     def on_negotiation_needed(self, element):
         log.info('on_negotiation_needed')
         promise = Gst.Promise.new_with_change_func(self.on_offer_created, element, None)
@@ -68,8 +72,9 @@ class WebRTCClient:
             'Type': 'addCalleeIceCandidate',
             'Value': json.dumps({
                 "candidate": candidate,
-                "sdpMid": "0",
+                "sdpMid": f"{mlineindex}",
                 "sdpMLineIndex": mlineindex,
+                "usernameFragment": self.userfragments[mlineindex],
                 })
             })
         log.info(f'send_ice_candidate_message with {icemsg}')