feat(webrtc): enable audio dtx

lib/services/webrtc/helpers/extensions/sdp_extensions.dart

@@ -0,0 +1,12 @@
+extension SdpX on String {
+  String removeRTCPMux() {
+    return replaceAll(RegExp(r'a=rtcp-mux.*\r\n'), '');
+  }
+
+  String enableAudioDTX() {
+    return replaceAll(
+      'a=fmtp:111 minptime=10;useinbandfec=1',
+      'a=fmtp:111 minptime=10;useinbandfec=1;usedtx=1',
+    );
+  }
+}

lib/services/webrtc/helpers/webrtc_utils.dart

@@ -1,15 +1 @@
-class WebRTCUtils {
-  static String removeRTCPMux(String sdp) {
-    sdp = sdp.replaceAll(RegExp(r'a=rtcp-mux.*\r\n'), '');
-
-    return sdp;
-  }
-
-  static String enableAudioDTX({required String sdp}) {
-    sdp = sdp.replaceAll(
-      'a=fmtp:111 minptime=10;useinbandfec=1',
-      'a=fmtp:111 minptime=10;useinbandfec=1;usedtx=1',
-    );
-    return sdp;
-  }
-}
+class WebRTCUtils {}

lib/services/webrtc/webrtc_impl.dart

@@ -9,6 +9,7 @@ import 'package:waterbus/features/app/bloc/bloc.dart';
 import 'package:waterbus/features/meeting/presentation/bloc/meeting/meeting_bloc.dart';
 import 'package:waterbus/services/socket.dart';
 import 'package:waterbus/services/webrtc/abstract/webrtc_interface.dart';
+import 'package:waterbus/services/webrtc/helpers/extensions/sdp_extensions.dart';
 import 'package:waterbus/services/webrtc/models/call_state.dart';
 
 @LazySingleton(as: WaterbusWebRTCManager)
@@ -60,9 +61,9 @@ class WaterbusWebRTCManagerIpml extends WaterbusWebRTCManager {
     _publisherPeer?.onRenegotiationNeeded = () async {
       if ((await _publisherPeer?.getRemoteDescription()) != null) return;
 
-      final String sdp = await _createOffer(_publisherPeer!);
+      String sdp = await _createOffer(_publisherPeer!);
 
-      // sdp = WebRTCUtils.enableAudioDTX(sdp: sdp);
+      sdp = sdp.enableAudioDTX();
 
       final RTCSessionDescription description = RTCSessionDescription(
         sdp,