addLiveStreamTask method Null safety

Future<int> addLiveStreamTask(
  1. NERtcLiveStreamTaskInfo taskInfo,
  2. AddLiveTaskCallback? callback
)

Add a live streaming task. After the method is successfully called, the current user can receive the notification about the status of the live streaming task. The operation is valid during a call. taskInfo live streaming task info AddLiveTaskCallback operation result. The callback is triggered when the operation succeeds

Implementation

Future<int> addLiveStreamTask(
    NERtcLiveStreamTaskInfo taskInfo, AddLiveTaskCallback? callback) async {
  int serial = -1;
  if (callback != null) {
    serial = _onceEventHandler.addOnceCallback((args) {
      callback(args['taskId'], args['errCode']);
    });
  }
  List<Map<dynamic, dynamic>>? userTranscodingList =
      taskInfo.layout?.userTranscodingList?.map((e) => e._toMap()).toList();
  IntValue reply =
      await _api.addLiveStreamTask(AddOrUpdateLiveStreamTaskRequest()
        ..serial = serial
        ..taskId = taskInfo.taskId
        ..url = taskInfo.url
        ..serverRecordEnabled = taskInfo.serverRecordEnabled
        ..liveMode = taskInfo.liveMode
        ..layoutWidth = taskInfo.layout?.width
        ..layoutHeight = taskInfo.layout?.height
        ..layoutBackgroundColor = taskInfo.layout?.backgroundColor?.value
        ..layoutImageUrl = taskInfo.layout?.backgroundImg?.url
        ..layoutImageX = taskInfo.layout?.backgroundImg?.x
        ..layoutImageY = taskInfo.layout?.backgroundImg?.y
        ..layoutImageWidth = taskInfo.layout?.backgroundImg?.width
        ..layoutImageHeight = taskInfo.layout?.backgroundImg?.height
        ..layoutUserTranscodingList = userTranscodingList);
  return reply.value ?? -1;
}