Merge pull request #20 from barteksto/feature/bufferedamountlow

add bufferedamountlow

Author: cloudwebrtc

lib/src/rtc_data_channel_impl.dart

@@ -22,6 +22,9 @@ class RTCDataChannelWeb extends RTCDataChannel {
       _messageController.add(msg);
       onMessage?.call(msg);
     });
+    _jsDc.addEventListener('bufferedamountlow', (_) {
+      onBufferedAmountLow?.call(bufferedAmount ?? 0);
+    });
   }
 
   final html.RtcDataChannel _jsDc;
@@ -39,6 +42,11 @@ class RTCDataChannelWeb extends RTCDataChannel {
   @override
   int? get bufferedAmount => _jsDc.bufferedAmount;
 
+  @override
+  set bufferedAmountLowThreshold(int? bufferedAmountLowThreshold) {
+    _jsDc.bufferedAmountLowThreshold = bufferedAmountLowThreshold;
+  }
+
   final _stateChangeController =
       StreamController<RTCDataChannelState>.broadcast(sync: true);
   final _messageController =