From 867c2b78b6224e99e6bbfb8922f77dafa9a10303 Mon Sep 17 00:00:00 2001
From: Guillaume Desmottes <guillaume.desmottes@onestream.live>
Date: Tue, 19 Nov 2024 15:15:56 +0100
Subject: [PATCH] webrtc: janus: handle slow_link videoroom event

Fix this warning:

webrtc-janusvr-signaller imp.rs:426:gstrswebrtc::janusvr_signaller::imp::Signaller::handle_msg:<GstJanusVRWebRTCSignallerU64@0x7f317009b4d0> Unknown message from server: {
   "janus": "event",
   "session_id": 980554280060589,
   "sender": 5867141593320621,
   "plugindata": {
      "plugin": "janus.plugin.videoroom",
      "data": {
         "videoroom": "slow_link",
         "current-bitrate": 0
      }
   }
}

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-rs/-/merge_requests/1929>
---
 net/webrtc/src/janusvr_signaller/imp.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/net/webrtc/src/janusvr_signaller/imp.rs b/net/webrtc/src/janusvr_signaller/imp.rs
index 8fa159cd..36fe8d4d 100644
--- a/net/webrtc/src/janusvr_signaller/imp.rs
+++ b/net/webrtc/src/janusvr_signaller/imp.rs
@@ -211,6 +211,12 @@ struct RoomTalking {
     audio_level: f32,
 }
 
+#[derive(Serialize, Deserialize, Debug)]
+struct SlowLink {
+    #[serde(rename = "current-bitrate")]
+    current_bitrate: u32,
+}
+
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(tag = "videoroom", rename_all = "kebab-case")]
 enum VideoRoomData {
@@ -219,6 +225,8 @@ enum VideoRoomData {
     Destroyed(RoomDestroyed),
     Talking(RoomTalking),
     StoppedTalking(RoomTalking),
+    #[serde(rename = "slow_link")]
+    SlowLink(SlowLink),
 }
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -542,6 +550,9 @@ impl Signaller {
                         VideoRoomData::StoppedTalking(talking) => {
                             self.emit_talking(false, talking.id, talking.audio_level);
                         }
+                        VideoRoomData::SlowLink(_slow_link) => {
+                            // TODO: use to reduce the bitrate?
+                        }
                     }
                 }
             }