add singleton trick

lib/src/compress_video_service.dart

@@ -2,10 +2,10 @@ import 'dart:async';
 import 'package:synchronized/synchronized.dart';
 import 'package:video_compress/video_compress.dart';
 
-class CompressVideoService {
-  static final CompressVideoService instance = CompressVideoService._();
+class ICompressVideoService {
+  static final ICompressVideoService instance = ICompressVideoService._();
   final _lock = Lock();
-  CompressVideoService._();
+  ICompressVideoService._();
 
   Future<MediaInfo> compressVideo(String path) async {
     return _lock.synchronized(() {
@@ -15,3 +15,6 @@ class CompressVideoService {
     });
   }
 }
+
+ICompressVideoService get CompressVideoService =>
+    ICompressVideoService.instance;

lib/src/message_input.dart

@@ -866,8 +866,7 @@ class MessageInputState extends State<MessageInput> {
 
       if (file.size > _kMaxAttachmentSize) {
         if (medium.mediaType == MediaType.video) {
-          final mediaInfo =
-              await CompressVideoService.instance.compressVideo(file.path);
+          final mediaInfo = await CompressVideoService.compressVideo(file.path);
 
           if (mediaInfo.filesize / (1024 * 1024) > _kMaxAttachmentSize) {
             Scaffold.of(context).showSnackBar(
@@ -1561,8 +1560,7 @@ class MessageInputState extends State<MessageInput> {
 
     if (file.size > _kMaxAttachmentSize) {
       if (attachmentType == 'video') {
-        final mediaInfo =
-            await CompressVideoService.instance.compressVideo(file.path);
+        final mediaInfo = await CompressVideoService.compressVideo(file.path);
         file = PlatformFile(
           name: mediaInfo.title,
           size: mediaInfo.filesize,