Flutter视频流播放插件flutter_gstreamer_player的使用

GStreamer Player插件

一个基于GStreamer的替代video_player插件，支持Linux、iOS和Android。

安装

Linux

按照GStreamer的Linux安装指南进行操作。

iOS

按照GStreamer的iOS开发安装指南进行操作，步骤包括Prerequisites 和 Download and install GStreamer binaries。

将GStreamer框架链接到ios目录，以便flutter的ios构建系统可以访问。

ln -s /Users/<Your_User_Name>/Library/Developer/GStreamer/iPhone.sdk/GStreamer.framework ios/GStreamer.framework

Android

按照GStreamer的Android开发安装指南进行操作，步骤包括Prerequisites 和 Download and install GStreamer binaries。

在Android中，你需要在主活动中初始化GStreamer。在你的flutter应用中，编辑MainActivity.kt或MainActivity.java文件（取决于你的flutter配置）。通常该文件位于android/app/src/main/<PATH_DEPENDENT_ON_YOUR_FLUTTER_APPLICATION>/MainActivity.kt。

导入GStreamer模块并覆盖onCreate方法以初始化GStreamer，最终结果应如下所示：

import org.freedesktop.gstreamer.GStreamer;

class MainActivity: FlutterActivity() {
  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState);

    GStreamer.init(this);
  }
}

此源代码已在GStreamer 1.20.1版本下测试通过。

开始使用

要开始使用插件，复制以下代码或查看示例项目中的example目录。

import 'package:flutter/material.dart';

import 'package:flutter/services.dart';
import 'package:flutter_gstreamer_player/flutter_gstreamer_player.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: GstPlayer(
          pipeline:
            '''rtspsrc location=
                rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
              rtph264depay !
              h264parse !
              decodebin !
              videoconvert !
              video/x-raw,format=RGBA !
              appsink name=sink''',
        ),
      ),
    );
  }
}

示例代码

以下是示例代码：

import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';

import 'package:flutter_gstreamer_player/flutter_gstreamer_player.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  Widget initMultipleGstPlayer(List<String> pipelines) {
    // 尝试这个: https://stackoverflow.com/a/66421214
    List<Widget> videoListWidget = [];
    for (var i = 0; i < pipelines.length - 1; i = i + 2){
      videoListWidget.add(
        Expanded(
          child: Row(
            children: <Widget> [
              Expanded(
                child: GstPlayer(
                  pipeline: pipelines[i],
                ),
              ),
              Expanded(
                child: GstPlayer(
                  pipeline: pipelines[i+1],
                ),
              ),
            ],
          ),
        ),
      );
    }

    if (pipelines.length.isOdd) {
      videoListWidget.add(
        Expanded(
          child: Row(
            children: <Widget> [
              Expanded(
                child: GstPlayer(
                  pipeline: pipelines.last,
                ),
              ),
            ],
          ),
        ),
      );
    }

    Widget multipleGstPlayer = Column(
          children: videoListWidget,
        );

    return multipleGstPlayer;
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    List<String> pipelines = [];

    switch (defaultTargetPlatform) {
      case (TargetPlatform.linux):
      case (TargetPlatform.android):
        pipelines.addAll([
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            videoconvert !
            video/x-raw,format=RGBA !
            appsink name=sink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            videoconvert !
            video/x-raw,format=RGBA !
            appsink name=sink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            videoconvert !
            video/x-raw,format=RGBA !
            appsink name=sink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            videoconvert !
            video/x-raw,format=RGBA !
            appsink name=sink''',
        ]);
        break;
      case (TargetPlatform.iOS):
        pipelines.addAll([
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            glimagesink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            glimagesink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            glimagesink''',
          '''rtspsrc location=
              rtsp://wowzaec2demo.streamlock.net/vod/mp4:BigBuckBunny_115k.mp4 !
            decodebin !
            glimagesink''',
        ]);
        break;
      default:
        break;
    }

    Widget multipleGstPlayer = initMultipleGstPlayer(pipelines);

    return MaterialApp(
      home: Scaffold(
        body: multipleGstPlayer,
      ),
    );
  }
}