getVideoAnnotation method
Get video annotation object.
Parameter userId
User ID
Parameter streamId
Stream ID
Returns
- non-null: a pointer to the video annotation object
- others: Failure
获取视频标注对象
Parameter userId
用户ID
Parameter streamId
视频流ID
Returns
- 非空指针: 指向视频标注对象的指针。
- 空指针: 失败
Implementation
@override
Future<RtcAnnotation?> getVideoAnnotation(String userId, int streamId) async {
var annotationId = await _invokeMethod(
'getVideoAnnotation', {'userId': userId, 'streamId': streamId})
as String;
if (annotationId.isNotEmpty) {
annotations[annotationId] ??= RtcAnnotation(annotationId);
return annotations[annotationId];
}
return null;
}