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有没有外国网站可以做兼职翻译的,人工智能培训班收费标准,泰安房产中介公司,淘宝做详情页代码网站flutter开发实战-ijkplayer视频播放器功能 使用better_player播放器进行播放视频时候，在Android上会出现解码失败的问题，better_player使用的是video_player，video_player很多视频无法解码。最终采用ijkplayer播放器插件，在flutt…

flutter开发实战-ijkplayer视频播放器功能

使用better_player播放器进行播放视频时候，在Android上会出现解码失败的问题，better_player使用的是video_player，video_player很多视频无法解码。最终采用ijkplayer播放器插件，在flutter上使用fijkplayer插件。
在这里插入图片描述
在这里插入图片描述

一、引入fijkplayer

在使用fijkplayer前可以先看下https://fijkplayer.befovy.com/docs/zh/fijkplayer-api.html

在工程的pubspec.yaml中引入插件

  fijkplayer: ^0.11.0

fijkPlayer 就是对 native C 层 ijkplayer 的一个 dart 包装，接口都保持一致。 FijkPlayer 处理所有播放相关的工作，实际工作都是由 native C 层 ijkplayer 完成，包含检查 dataSource 中的媒体信息，打开解码器和解码线程、打开音频输出设备、将解码后数据输出给音频设备或显示设备。

二、使用fijkplayer

2.1、IJKVideoPlayerController控制常用操作

使用fijkplayer，这里创建了IJKVideoPlayer来嵌套一下FijkView，使用IJKVideoPlayerController来控制常用功能操作

IJKVideoPlayerController如下

import 'dart:async';class IJKVideoPlayerController {FutureOr Function()? stop;FutureOr Function()? pause;FutureOr Function()? play;FutureOr Function(int msec)? seekTo;FutureOr Function(double volume)? setVolume;FutureOr Function(double speed)? setSpeed;FutureOr Function(int loopCount)? setLoop;FutureOr Function()? isPlaying;
}

IJKVideoPlayerController来控制停止、暂停、播放、seek、设置音量、设置播放速率、设置循环次数、获取是否在播放中等。

  • 播放视频
  void play() {if (videoPlayerController.play != null) {videoPlayerController.play!.call();}}
  • 暂停视频播放
  void pause() {if (videoPlayerController.pause != null) {videoPlayerController.pause!.call();}}
  • 停止视频播放
  void stop() {if (videoPlayerController.stop != null) {videoPlayerController.stop!.call();}}
  • seek指定位置
  void seekTo(int msec) {if (videoPlayerController.seekTo != null) {videoPlayerController.seekTo!.call(msec);}}
  • 设置音量
  void setVolume(double volume) {if (videoPlayerController.setVolume != null) {videoPlayerController.setVolume!.call(volume);}}
  • 设置播放速率
  void setSpeed(double speed) {if (videoPlayerController.setSpeed != null) {videoPlayerController.setSpeed!.call(speed);}}
  • 设置循环次数
  void setLoop(int loopCount) {if (videoPlayerController.setLoop != null) {videoPlayerController.setLoop!.call(loopCount);}}
  • 获取是否播放中
  Future<bool?> isPlaying() async {if (videoPlayerController.isPlaying != null) {bool videoIsPlaying = await videoPlayerController.isPlaying!.call();return videoIsPlaying;}return Future.value(null);}

2.2、在ijkplayer设置source，使用FijkPlayer

在设置播放器的时候，需要设置source类型。fijkplayer提供了两种方式，一种是本地工程文件、一种是网络视频地址。

  • 设置网络视频源
  /// usage/// autoPlay 为 true 时等同于连续调用 setDataSource、prepareAsync、startfplayer.setDataSource("http://samplevideo.com/sample.flv", autoPlay: true);
  • 设置本地资源作为播放源
  /// pubspec.yml 中需要指定assets 内容///   assets:///     - assets/butterfly.mp4////// scheme 是 `asset`, `://` 是 scheme 分隔符， `/` 是路径起始符号fplayer.setDataSource("asset:///assets/butterfly.mp4", autoPlay: true);

在setDataSource还有autoPlay（自动播放），showCover（是否显示视频封面，视频默认获取第一帧作为视频封面）

2.3、FijkView显示视频的控件Widget

在fijkplayer中，使用FijkView来显示视频。

  FijkView({required this.player,this.width,this.height,this.fit = FijkFit.contain,this.fsFit = FijkFit.contain,this.panelBuilder = defaultFijkPanelBuilder,this.color = const Color(0xFF607D8B),this.cover,this.fs = true,this.onDispose,});

可以设置显示fit、全屏的fit、背景颜色color、封面图（设置之后会显示在视频播放的上面）、是否全屏等。

在这里我们如果需要自定义样式，可以替换掉panelBuilder。

2.4、自定义控件IJKVideoPanel

在这里我们如果需要自定义样式，可以替换掉panelBuilder。我们自定义一个IJKVideoPanel，这个大部分代码来源default，这里调整了部分样式。

IJKVideoPanel完整代码如下

import 'dart:async';
import 'dart:math';import 'package:fijkplayer/fijkplayer.dart';
import 'package:flutter/material.dart';class IJKVideoPanel extends StatefulWidget {const IJKVideoPanel({super.key,required this.player,required this.buildContext,required this.viewSize,required this.texturePos,});final FijkPlayer player;final BuildContext buildContext;final Size viewSize;final Rect texturePos;@overrideState<IJKVideoPanel> createState() => _IJKVideoPanelState();
}class _IJKVideoPanelState extends State<IJKVideoPanel> {FijkPlayer get player => widget.player;Duration _duration = Duration();Duration _currentPos = Duration();Duration _bufferPos = Duration();bool _playing = false;bool _prepared = false;String? _exception;// bool _buffering = false;double _seekPos = -1.0;StreamSubscription? _currentPosSubs;StreamSubscription? _bufferPosSubs;//StreamSubscription _bufferingSubs;Timer? _hideTimer;bool _hideStuff = true;double _volume = 1.0;final barHeight = 40.0;@overridevoid initState() {super.initState();_duration = player.value.duration;_currentPos = player.currentPos;_bufferPos = player.bufferPos;_prepared = player.state.index >= FijkState.prepared.index;_playing = player.state == FijkState.started;_exception = player.value.exception.message;// _buffering = player.isBuffering;player.addListener(_playerValueChanged);_currentPosSubs = player.onCurrentPosUpdate.listen((v) {setState(() {_currentPos = v;});});_bufferPosSubs = player.onBufferPosUpdate.listen((v) {setState(() {_bufferPos = v;});});}void _playerValueChanged() {FijkValue value = player.value;if (value.duration != _duration) {setState(() {_duration = value.duration;});}bool playing = (value.state == FijkState.started);bool prepared = value.prepared;String? exception = value.exception.message;if (playing != _playing ||prepared != _prepared ||exception != _exception) {setState(() {_playing = playing;_prepared = prepared;_exception = exception;});}}void _playOrPause() {if (_playing == true) {player.pause();} else {player.start();}}@overridevoid dispose() {super.dispose();_hideTimer?.cancel();player.removeListener(_playerValueChanged);_currentPosSubs?.cancel();_bufferPosSubs?.cancel();}void _startHideTimer() {_hideTimer?.cancel();_hideTimer = Timer(const Duration(seconds: 3), () {setState(() {_hideStuff = true;});});}void _cancelAndRestartTimer() {if (_hideStuff == true) {_startHideTimer();}setState(() {_hideStuff = !_hideStuff;});}Widget _buildVolumeButton() {IconData iconData;if (_volume <= 0) {iconData = Icons.volume_off;} else {iconData = Icons.volume_up;}return IconButton(icon: Icon(iconData, color: Colors.white),padding: EdgeInsets.only(left: 10.0, right: 10.0),onPressed: () {setState(() {_volume = _volume > 0 ? 0.0 : 1.0;player.setVolume(_volume);});},);}AnimatedOpacity _buildBottomBar(BuildContext context) {double duration = _duration.inMilliseconds.toDouble();double currentValue =_seekPos > 0 ? _seekPos : _currentPos.inMilliseconds.toDouble();currentValue = min(currentValue, duration);currentValue = max(currentValue, 0);return AnimatedOpacity(opacity: _hideStuff ? 0.0 : 0.8,duration: Duration(milliseconds: 400),child: Container(height: barHeight,decoration: BoxDecoration(gradient: LinearGradient(colors: [Colors.transparent, Colors.black45],begin: Alignment.topCenter,end: Alignment.bottomCenter,),),child: Row(children: <Widget>[_buildVolumeButton(),Padding(padding: EdgeInsets.only(right: 5.0, left: 5),child: Text('${_duration2String(_currentPos)}',style: TextStyle(fontSize: 14.0, color: Colors.white),),),_duration.inMilliseconds == 0? Expanded(child: Center()): Expanded(child: Padding(padding: EdgeInsets.only(right: 0, left: 0),child: FijkSlider(value: currentValue,cacheValue: _bufferPos.inMilliseconds.toDouble(),min: 0.0,max: duration,onChanged: (v) {_startHideTimer();setState(() {_seekPos = v;});},onChangeEnd: (v) {setState(() {player.seekTo(v.toInt());print("seek to $v");_currentPos =Duration(milliseconds: _seekPos.toInt());_seekPos = -1;});},),),),// duration / position_duration.inMilliseconds == 0? Container(child: const Text("LIVE")): Padding(padding: EdgeInsets.only(right: 5.0, left: 5),child: Text('${_duration2String(_duration)}',style: TextStyle(fontSize: 14.0, color: Colors.white),),),//             IconButton(
//               icon: Icon(widget.player.value.fullScreen
//                   ? Icons.fullscreen_exit
//                   : Icons.fullscreen),
//               padding: EdgeInsets.only(left: 10.0, right: 10.0),
// //              color: Colors.transparent,
//               onPressed: () {
//                 widget.player.value.fullScreen
//                     ? player.exitFullScreen()
//                     : player.enterFullScreen();
//               },
//             )//],),),);}@overrideWidget build(BuildContext context) {// Rect rect = player.value.fullScreen//     ? Rect.fromLTWH(0, 0, widget.viewSize.width, widget.viewSize.height)//     : Rect.fromLTRB(//     max(0.0, widget.texturePos.left),//     max(0.0, widget.texturePos.top),//     min(widget.viewSize.width, widget.texturePos.right),//     min(widget.viewSize.height, widget.texturePos.bottom));Rect rect =Rect.fromLTWH(0, 0, widget.viewSize.width, widget.viewSize.height);return Positioned.fromRect(rect: rect,child: GestureDetector(onTap: _cancelAndRestartTimer,child: AbsorbPointer(absorbing: _hideStuff,child: Column(children: <Widget>[Container(height: barHeight),Expanded(child: GestureDetector(onTap: () {_cancelAndRestartTimer();},child: Container(color: Colors.transparent,height: double.infinity,width: double.infinity,child: Center(child: _exception != null? Text(_exception!,style: TextStyle(color: Colors.white,fontSize: 25,),): (_prepared ||player.state == FijkState.initialized)? AnimatedOpacity(opacity: _hideStuff ? 0.0 : 0.85,duration: Duration(milliseconds: 400),child: IconButton(iconSize: barHeight * 2,icon: Icon(_playing? Icons.pause: Icons.play_arrow,color: Colors.white,size: 44,),padding: EdgeInsets.only(left: 10.0, right: 10.0),onPressed: _playOrPause)): SizedBox(width: barHeight * 1.5,height: barHeight * 1.5,child: CircularProgressIndicator(valueColor: AlwaysStoppedAnimation(Colors.white)),)),),),),_buildBottomBar(context),],),),),);}
}String _duration2String(Duration duration) {if (duration.inMilliseconds < 0) return "-: negtive";String twoDigits(int n) {if (n >= 10) return "$n";return "0$n";}String twoDigitMinutes = twoDigits(duration.inMinutes.remainder(60));String twoDigitSeconds = twoDigits(duration.inSeconds.remainder(60));int inHours = duration.inHours;return inHours > 0? "$inHours:$twoDigitMinutes:$twoDigitSeconds": "$twoDigitMinutes:$twoDigitSeconds";
}

2.5、嵌套FijkView的IJKVideoPlayer

在使用时候，使用了IJKVideoPlayer来封装了一层FijkView。
在IJKVideoPlayer中设置了videoPlayerController控制播放的操作 如停止、暂停、播放、seek、设置音量、设置播放速率、设置循环次数、获取是否在播放中。

IJKVideoPlayer完整代码如下

  import 'package:fijkplayer/fijkplayer.dart';
import 'package:flutter/material.dart';
import 'package:flutter_app_demolab/ijk_player/ijk_video_panel.dart';import 'ijk_video_player_controller.dart';/// usage
/// autoPlay 为 true 时等同于连续调用 setDataSource、prepareAsync、start
/// fplayer.setDataSource("http://samplevideo.com/sample.flv", autoPlay: true);
///
/// 设置本地资源作为播放源，
/// pubspec.yml 中需要指定assets 内容
///   assets:
///     - assets/butterfly.mp4
///
/// scheme 是 `asset`, `://` 是 scheme 分隔符， `/` 是路径起始符号
/// fplayer.setDataSource("asset:///assets/butterfly.mp4", autoPlay: true);class IJKVideoPlayer extends StatefulWidget {const IJKVideoPlayer({super.key,required this.path,this.autoPlay = false,this.showCover = true,this.fit = FijkFit.contain,this.cover,this.color = Colors.black,this.width,this.height,this.videoPlayerController,});final double? width;final double? height;final String path;final bool autoPlay;final bool showCover;final FijkFit fit;final Widget? cover;final Color color;final IJKVideoPlayerController? videoPlayerController;@overrideState<IJKVideoPlayer> createState() => _IJKVideoPlayerState();
}class _IJKVideoPlayerState extends State<IJKVideoPlayer> {final FijkPlayer player = FijkPlayer();@overridevoid initState() {super.initState();player.setDataSource(widget.path,autoPlay: widget.autoPlay,showCover: widget.showCover,);addVideoPlayerFun();}void addVideoPlayerFun() {if (widget.videoPlayerController != null) {widget.videoPlayerController!.play = () {// 触发播放player.start();};widget.videoPlayerController!.stop = () {// 触发停止player.stop();};widget.videoPlayerController!.pause = () {// 触发暂停player.pause();};widget.videoPlayerController!.setLoop = (int loopCount) {// 触发setLoopif (loopCount < 0) {loopCount = 1;}player.setLoop(loopCount);};widget.videoPlayerController!.seekTo = (int msec) {// 触发seekif (msec < 0) {msec = 0;}player.seekTo(msec);};widget.videoPlayerController!.setVolume = (double volume) {// 触发setVolumeif (volume < 0.0) {volume = 0.0;}player.setVolume(volume);};widget.videoPlayerController!.setSpeed = (double speed) {// 触发setSpeedif (speed < 0.0) {speed = 1.0;}player.setSpeed(speed);};widget.videoPlayerController!.isPlaying = () {// 触发setVolumeif (FijkState.started == player.state) {return true;} else {return false;}};}}@overridevoid dispose() {super.dispose();player.release();}void onIJKDispose(FijkData fijkData) {}@overrideWidget build(BuildContext context) {return Container(alignment: Alignment.center,child: Stack(alignment: Alignment.center,children: [widget.cover != null ? widget.cover! : Container(),FijkView(width: widget.width,height: widget.height,player: player,fit: widget.fit,fsFit: widget.fit,color: widget.color,onDispose: onIJKDispose,panelBuilder: (FijkPlayer player, FijkData data,BuildContext context, Size viewSize, Rect texturePos) {return IJKVideoPanel(player: player,buildContext: context,viewSize: viewSize,texturePos: texturePos,);},),],),);}
}

三、最后使用IJKVideoPlayer的IJKVideoPage页面

这里我创建了一个IJKVideoPage来使用IJKVideoPlayer视频播放，IJKVideoPlayer中需要path与videoPlayerController

IJKVideoPage完整代码如下

  import 'dart:async';import 'package:flutter/material.dart';import 'ijk_player/ijk_video_player.dart';
import 'ijk_player/ijk_video_player_controller.dart';class IJKVideoPage extends StatefulWidget {const IJKVideoPage({super.key,required this.url,});final String url;@overrideState<IJKVideoPage> createState() => _IJKVideoPageState();
}class _IJKVideoPageState extends State<IJKVideoPage> {final IJKVideoPlayerController videoPlayerController =IJKVideoPlayerController();@overridevoid initState() {super.initState();}@overrideWidget build(BuildContext context) {Size size = MediaQuery.of(context).size;return Scaffold(appBar: AppBar(title: Text("Fijkplayer Example")),body: Center(child: Container(width: size.width,height: size.width * 9.0 / 16.0,alignment: Alignment.center,child: IJKVideoPlayer(path: widget.url,videoPlayerController: videoPlayerController,color: Colors.black,),),),);}@overridevoid dispose() {super.dispose();}
}

如果外面的页面跳转到播放页面，需要设置url

  void testIJKVideoPage(BuildContext context) {Navigator.of(context).push(MaterialPageRoute(builder: (BuildContext context) {return IJKVideoPage(url: "https://vd2.bdstatic.com/mda-maif0tt1rirqp27q/540p/h264_cae/1611052585/mda-maif0tt1rirqp27q.mp4");}));}

https://brucegwo.blog.csdn.net/article/details/136024588

四、小结

flutter开发实战-ijkplayer视频播放器功能

学习记录，每天不停进步。

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