Merge branch 'versatica:v3' into firefox-m-reuse

src/handlers/sdp/RemoteSdp.ts

@@ -509,6 +509,18 @@ export class RemoteSdp
 		this._regenerateBundleMids();
 	}
 
+	_findMediaSection(mid: string): MediaSection
+	{
+		const idx = this._midToIndex.get(mid);
+
+		if (idx === undefined)
+		{
+			throw new Error(`no media section found with mid '${mid}'`);
+		}
+
+		return this._mediaSections[idx];
+	}
+
 	_regenerateBundleMids(): void
 	{
 		if (!this._dtlsParameters)