From 959cca595e35927c7ff1e6a8853eea7d1f5c5c43 Mon Sep 17 00:00:00 2001
From: zuvola <zuvola@gmail.com>
Date: Tue, 23 Apr 2024 10:52:33 +0900
Subject: [PATCH 1/2] Added SDP for probator

(cherry picked from commit 7a1eeb2be1595bd6a910069d744fb719374116cf)
---
 .../src/VideoPlayer/StreamController.ts       |  5 +++++
 SFU/mediasoup-sdp-bridge/lib/index.js         | 21 +++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/Frontend/library/src/VideoPlayer/StreamController.ts b/Frontend/library/src/VideoPlayer/StreamController.ts
index 879ab1a2..85849722 100644
--- a/Frontend/library/src/VideoPlayer/StreamController.ts
+++ b/Frontend/library/src/VideoPlayer/StreamController.ts
@@ -31,6 +31,11 @@ export class StreamController {
             'handleOnTrack ' + JSON.stringify(rtcTrackEvent.streams),
             6
         );
+        
+        if (rtcTrackEvent.track.id == 'probator') {
+            return;
+        }
+
         const videoElement = this.videoElementProvider.getVideoElement();
 
         if (rtcTrackEvent.track) {
diff --git a/SFU/mediasoup-sdp-bridge/lib/index.js b/SFU/mediasoup-sdp-bridge/lib/index.js
index 2725e69c..f4a0baff 100644
--- a/SFU/mediasoup-sdp-bridge/lib/index.js
+++ b/SFU/mediasoup-sdp-bridge/lib/index.js
@@ -138,10 +138,14 @@ class SdpEndpoint {
         });
         const sendMsid = uuid_1.v4().substr(0, 8);
         console.log("[SdpEndpoint.createOffer] Make 'sendonly' SDP Offer");
+        var videoRtpParameters;        
         for (let i = 0; i < this.consumers.length; i++) {
             const mid = (_a = this.consumers[i].rtpParameters.mid) !== null && _a !== void 0 ? _a : "nomid";
             const kind = this.consumers[i].kind;
             const sendParams = this.consumers[i].rtpParameters;
+            if (kind === 'video') {
+                videoRtpParameters = JSON.parse(JSON.stringify(sendParams))
+            }            
             sdpBuilder.receive({
                 mid,
                 kind,
@@ -150,6 +154,23 @@ class SdpEndpoint {
                 trackId: `${sendMsid}-${kind}`,
             });
         }
+        if (videoRtpParameters) {
+            videoRtpParameters.codecs[0].payloadType = 127;
+            const rtpParameters = {
+                mid: 'probator',
+                codecs: [videoRtpParameters.codecs[0]],
+                headerExtensions: videoRtpParameters.headerExtensions,
+                encodings: [{ ssrc: 1234 }],
+                rtcp: { cname: 'probator' },
+            };    
+            sdpBuilder.receive({
+                mid: 'probator',
+                kind: 'video',
+                offerRtpParameters: rtpParameters,
+                streamId: 'probator',
+                trackId: 'probator',
+            });
+        }        
         if (this.consumeData) {
             sdpBuilder.receiveSctpAssociation();
         }

From 0d8d08184755d177f918235a4e44b4d0ef05d856 Mon Sep 17 00:00:00 2001
From: zuvola <zuvola@gmail.com>
Date: Tue, 7 May 2024 15:05:29 +0900
Subject: [PATCH 2/2] Update
 Frontend/library/src/VideoPlayer/StreamController.ts

Co-authored-by: Luke Bermingham <1215582+lukehb@users.noreply.github.com>
(cherry picked from commit 35f1733392b0a2659e4b2d35bc7c32bcdd256c2f)
---
 Frontend/library/src/VideoPlayer/StreamController.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Frontend/library/src/VideoPlayer/StreamController.ts b/Frontend/library/src/VideoPlayer/StreamController.ts
index 85849722..d7cad1a4 100644
--- a/Frontend/library/src/VideoPlayer/StreamController.ts
+++ b/Frontend/library/src/VideoPlayer/StreamController.ts
@@ -31,7 +31,8 @@ export class StreamController {
             'handleOnTrack ' + JSON.stringify(rtcTrackEvent.streams),
             6
         );
-        
+        // Do not add the track if the ID is `probator` as this is special track created by mediasoup for bitrate probing.
+        // Refer to https://github.com/EpicGamesExt/PixelStreamingInfrastructure/pull/86 for more details.
         if (rtcTrackEvent.track.id == 'probator') {
             return;
         }