如何用WebRTC实现电话视频聊天(安卓和Ios)

Question

我正在尝试用WebRTC实现会议视频呼叫，这对于Android和Ios现在无法找到用webRTC进行用户会议视频聊天的解决方案。

Answer 1

尝试下面这个包的示例webrtc

对于P2P，您将需要一个在https://github.com/flutter-webrtc/flutter-webrtc-server上可用的服务器组件

Answer 2

flutter_webrtc包文档在构建颤振WebRTC应用程序时并不是很广泛。

若要使用WebRTC将音频/视频通信添加到您的颤振应用程序中，请添加依赖项：

flutter pub add flutter_webrtc

为ios添加权限:将以下权限项添加到Info.plist文件中，位于/ios/Runner/Info.plist

<key>NSCameraUsageDescription</key>
<string>$(PRODUCT_NAME) Camera Usage!</string>
<key>NSMicrophoneUsageDescription</key>
<string>$(PRODUCT_NAME) Microphone Usage!</string>

为Android添加权限:要在android上启用用户权限，请将以下内容添加到位于/android/app/src/main/AndroidManifest.xml中的Android Manifest file中

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />

您还需要对build.gradle做一些更改

接下来，从在屏幕上呈现本地用户开始：

​

​

然后，我们需要连接到远程用户并呈现他们的视频。为此，我们需要了解WebRTC是如何工作的。与其相关的术语有NAT (网络地址翻译)、ICE (交互式连接建立)、STUN (会话遍历实用程序)、TURN等。

我们提供一个报价和一个连接两个同行的答案。

​

​

您可以查看这个颤振WebRTC综合指南来构建一个音频/视频通信应用程序。

Answer 3

以下是一个例子：

第一，您需要添加此依赖项：

dependencies:
  flutter_webrtc: ^0.8.0

然后：

import 'dart:core';

import 'package:flutter/foundation.dart'
    show debugDefaultTargetPlatformOverride;
import 'package:flutter/material.dart';
import 'package:flutter_background/flutter_background.dart';
import 'package:flutter_webrtc/flutter_webrtc.dart';

import 'src/data_channel_sample.dart';
import 'src/get_display_media_sample.dart';
import 'src/get_user_media_sample.dart'
    if (dart.library.html) 'src/get_user_media_sample_web.dart';
import 'src/loopback_sample.dart';
import 'src/route_item.dart';

void main() {
  if (WebRTC.platformIsDesktop) {
    debugDefaultTargetPlatformOverride = TargetPlatform.fuchsia;
  } else if (WebRTC.platformIsAndroid) {
    WidgetsFlutterBinding.ensureInitialized();
    startForegroundService();
  }
  runApp(MyApp());
}

Future<bool> startForegroundService() async {
  final androidConfig = FlutterBackgroundAndroidConfig(
    notificationTitle: 'Title of the notification',
    notificationText: 'Text of the notification',
    notificationImportance: AndroidNotificationImportance.Default,
    notificationIcon: AndroidResource(
        name: 'background_icon',
        defType: 'drawable'), // Default is ic_launcher from folder mipmap
  );
  await FlutterBackground.initialize(androidConfig: androidConfig);
  return FlutterBackground.enableBackgroundExecution();
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  late List<RouteItem> items;

  @override
  void initState() {
    super.initState();
    _initItems();
  }

  ListBody _buildRow(context, item) {
    return ListBody(children: <Widget>[
      ListTile(
        title: Text(item.title),
        onTap: () => item.push(context),
        trailing: Icon(Icons.arrow_right),
      ),
      Divider()
    ]);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: Text('Flutter-WebRTC example'),
          ),
          body: ListView.builder(
              shrinkWrap: true,
              padding: const EdgeInsets.all(0.0),
              itemCount: items.length,
              itemBuilder: (context, i) {
                return _buildRow(context, items[i]);
              })),
    );
  }

  void _initItems() {
    items = <RouteItem>[
      RouteItem(
          title: 'GetUserMedia',
          push: (BuildContext context) {
            Navigator.push(
                context,
                MaterialPageRoute(
                    builder: (BuildContext context) => GetUserMediaSample()));
          }),
      RouteItem(
          title: 'GetDisplayMedia',
          push: (BuildContext context) {
            Navigator.push(
                context,
                MaterialPageRoute(
                    builder: (BuildContext context) =>
                        GetDisplayMediaSample()));
          }),
      RouteItem(
          title: 'LoopBack Sample',
          push: (BuildContext context) {
            Navigator.push(
                context,
                MaterialPageRoute(
                    builder: (BuildContext context) => LoopBackSample()));
          }),
      RouteItem(
          title: 'DataChannel',
          push: (BuildContext context) {
            Navigator.push(
                context,
                MaterialPageRoute(
                    builder: (BuildContext context) => DataChannelSample()));
          }),
    ];
  }
}