基于腾讯云播放器封装的Flutter Video Player插

基于腾讯云播放器封装的Flutter Video Player插件

项目github地址：https://github.com/RandyWei/flt_video_player

Flutter版本现在已经更新到了v1.5.4-hotfix.2，在国内也越来越火。

在之前项目中有视频播放功能，使用了flutter官方出的video_player库完成实现。flutter官方所有插件，详见https://github.com/flutter/plugins

官方的video_player，安卓是基于ExoPlayer，苹果是基于原生的AVPlayer，目前项目使用中也没什么毛病。

在闲暇之余，出于学习开发flutter plugin目的，基于腾讯云(https://cloud.tencent.com/document/product/881)播放器封装了一个flutter视频播放器。

目前项目在开发测试阶段，还没发布到pub平台上，可通过git配置使用。

项目github地址：https://github.com/RandyWei/flt_video_player

播放器开放了部分腾讯云播放器的功能，如：倍速、静音等。

参考资料:

https://github.com/An-uking/Flutter_IJKPlayer

https://github.com/CaiJingLong/flutter_ijkplayer

https://github.com/flutter/plugins/tree/master/packages/video_player

在项目开发过程中碰到了以下问题，作了一下总结：

1、出现label标签冲突问题，如下错误

Attribute application@label value=(flutter_plugin_demo_example) from AndroidManifest.xml:13:9-52is also present at [LiteAVSDK_Player_6.3.7089.aar] AndroidManifest.xml:19:9-41 value=(@string/app_name).Suggestion: add 'tools:replace="android:label"' to <application> element at AndroidManifest.xml:11:5-35:19 to override.

这个错误是在安卓端出现的，因为使用了LiteAVSDK类似这种使用了各种第三方库包含android:label的，所以冲突了

解决办法：其实错误代码提示也很是明确，或者直接上谷歌去百度一下就可以得到答案，在mainfest Application标签中添加tools:relpace=”label”即可。

2、在使用EventChannel进行Flutter和Native通信过程中出现以下错误：

E/EventChannel#flutter_plugin_demo.event.status(15177): Failed to open event streamE/EventChannel#flutter_plugin_demo.event.status(15177): java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter oE/EventChannel#flutter_plugin_demo.event.status(15177): at com.chinahrt.flutter_plugin_demo2.FlutterPluginDemo2Plugin$onMethodCall$1.onListen(Unknown Source:2)E/EventChannel#flutter_plugin_demo.event.status(15177): at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onListen(EventChannel.java:181)E/EventChannel#flutter_plugin_demo.event.status(15177): at io.flutter.plugin.common.EventChannel$IncomingStreamRequestHandler.onMessage(EventChannel.java:160)E/EventChannel#flutter_plugin_demo.event.status(15177): at io.flutter.view.FlutterNativeView$PlatformMessageHandlerImpl.handleMessageFromDart(FlutterNativeView.java:188)E/EventChannel#flutter_plugin_demo.event.status(15177): at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:202)E/EventChannel#flutter_plugin_demo.event.status(15177): at android.os.MessageQueue.nativePollOnce(Native Method)E/EventChannel#flutter_plugin_demo.event.status(15177): at android.os.MessageQueue.next(MessageQueue.java:326)E/EventChannel#flutter_plugin_demo.event.status(15177): at android.os.Looper.loop(Looper.java:160)E/EventChannel#flutter_plugin_demo.event.status(15177): at android.app.ActivityThread.main(ActivityThread.java:6718)E/EventChannel#flutter_plugin_demo.event.status(15177): at java.lang.reflect.Method.invoke(Native Method)E/EventChannel#flutter_plugin_demo.event.status(15177): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)E/EventChannel#flutter_plugin_demo.event.status(15177): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)I/flutter (15177): ══╡ EXCEPTION CAUGHT BY SERVICES LIBRARY ╞══════════════════════════════════════════════════════════I/flutter (15177): The following PlatformException was thrown while activating platform stream on channelI/flutter (15177): flutter_plugin_demo.event.status:I/flutter (15177): PlatformException(error, Parameter specified as non-null is null: methodI/flutter (15177): kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter o, null)I/flutter (15177):I/flutter (15177): When the exception was thrown, this was the stack:I/flutter (15177): #0      StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:564:7)I/flutter (15177): #1      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:302:33)I/flutter (15177): <asynchronous suspension>I/flutter (15177): #2      EventChannel.receiveBroadcastStream.<anonymous closure> (package:flutter/src/services/platform_channel.dart:490:29)I/flutter (15177): <asynchronous suspension>I/flutter (15177): #7      VideoPlayerController.initialize (package:flutter_plugin_demo2/video_player.dart:33:10)I/flutter (15177): <asynchronous suspension>I/flutter (15177): #8      _MyAppState.initState (package:flutter_plugin_demo2_example/main.dart:25:9)I/flutter (15177): #9      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:3846:58)I/flutter (15177): #10     ComponentElement.mount (package:flutter/src/widgets/framework.dart:3711:5)I/flutter (15177): #11     Element.inflateWidget (package:flutter/src/widgets/framework.dart:2956:14)I/flutter (15177): #12     Element.updateChild (package:flutter/src/widgets/framework.dart:2759:12)I/flutter (15177): #13     RenderObjectToWidgetElement._rebuild (package:flutter/src/widgets/binding.dart:933:16)I/flutter (15177): #14     RenderObjectToWidgetElement.mount (package:flutter/src/widgets/binding.dart:904:5)I/flutter (15177): #15     RenderObjectToWidgetAdapter.attachToRenderTree.<anonymous closure> (package:flutter/src/widgets/binding.dart:850:17)I/flutter (15177): #16     BuildOwner.buildScope (package:flutter/src/widgets/framework.dart:2253:19)I/flutter (15177): #17     RenderObjectToWidgetAdapter.attachToRenderTree (package:flutter/src/widgets/binding.dart:849:13)I/flutter (15177): #18     _WidgetsFlutterBinding&BindingBase&GestureBinding&ServicesBinding&SchedulerBinding&PaintingBinding&SemanticsBinding&RendererBinding&WidgetsBinding.attachRootWidget (package:flutter/src/widgets/binding.dart:736:7)I/flutter (15177): #19     runApp (package:flutter/src/widgets/binding.dart:780:7)I/flutter (15177): #20     main (package:flutter_plugin_demo2_example/main.dart:8:16)I/flutter (15177): #21     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:189:25)I/flutter (15177): #26     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:180:5)I/flutter (15177): #27     _startIsolate.<anonymous closure> (dart:isolate/runtime/libisolate_patch.dart:300:19)I/flutter (15177): #28     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)I/flutter (15177): (elided 8 frames from package dart:async)I/flutter (15177): ════════════════════════════════════════════════════════════════════════════════════════════════════

这个问题还是出现在安卓平台上，因为安卓项目使用了kotlin支持，在写kotlin代码实现EventChannel.StreamHandler时

override fun onListen(o: Any?, sink: EventChannel.EventSink?) {

}

override fun onCancel(o: Any?) {

}

参数应该可空，因误写成不可空，导致报错。

所以解决办法就是加?就可以

3、在iOS项目podspec上配置腾讯云播放器TXLiteAVSDK_Player支持时，出现以下问题

Undefined symbols for architecture x86_64:     "vtable for __cxxabiv1::__si_class_type_info", referenced from:         typeinfo for bssl::(anonymous namespace)::ECKeyShare in TXLiteAVSDK_Player(ssl_key_share.o)         typeinfo for bssl::(anonymous namespace)::X25519KeyShare in TXLiteAVSDK_Player(ssl_key_share.o)     NOTE: a missing vtable usually means the first non-inline virtual member function has no definition.     "_sqlite3_column_text", referenced from:         _qcloud_ijktsdb_meta_select in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_bind_blob", referenced from:         _qcloud_ijktsdb_insert in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_bind_text", referenced from:         _qcloud_ijktsdb_select in TXLiteAVSDK_Player(ijktsdb.o)         _ijktsdb_check in TXLiteAVSDK_Player(ijktsdb.o)         _qcloud_ijktsdb_insert in TXLiteAVSDK_Player(ijktsdb.o)         _qcloud_ijktsdb_meta_select in TXLiteAVSDK_Player(ijktsdb.o)         _qcloud_ijktsdb_meta_insert in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_column_bytes", referenced from:         _qcloud_ijktsdb_select in TXLiteAVSDK_Player(ijktsdb.o)         _ijktsdb_check in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_column_blob", referenced from:         _qcloud_ijktsdb_select in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_errcode", referenced from:         _databaseError in TXLiteAVSDK_Player(ijktsdb.o)     "_sqlite3_close", referenced from:         _qcloud_ijktsdb_open in TXLiteAVSDK_Player(ijktsdb.o)         _qcloud_ijktsdb_close in TXLiteAVSDK_Player(ijktsdb.o)

使用framwork配置无论怎样都配置不成功，如果有大佬知道怎么配置的，可以教教我

最后还是使用了pod：s.dependency 'TXLiteAVSDK_Player' 配置成功了。

参考资料：

https://guides.cocoapods.org/syntax/podspec.html#dependency

4、在开发过程中出现以下错误：

Exception: ideviceinfo returned an error:ERROR: Could not connect to lockdownd, error code -8#0      IMobileDevice.getInfoForDevice (package:flutter_tools/src/ios/mac.dart:141:9)<asynchronous suspension>#1      IOSDevice.getAttachedDevices (package:flutter_tools/src/ios/devices.dart:156:55)<asynchronous suspension>#2      IOSDevices.pollingGetDevices (package:flutter_tools/src/ios/devices.dart:110:57)#3      PollingDeviceDiscovery.devices (package:flutter_tools/src/device.dart:186:52)<asynchronous suspension>#4      DeviceManager.getAllConnectedDevices (package:flutter_tools/src/device.dart:114:46)<asynchronous suspension>#5      DeviceValidator.validate (package:flutter_tools/src/doctor.dart:705:54)<asynchronous suspension>#6      Doctor.startValidatorTasks (package:flutter_tools/src/doctor.dart:129:52)#7      Doctor.diagnose (package:flutter_tools/src/doctor.dart:200:41)#8      _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6)#9      Doctor.diagnose (package:flutter_tools/src/doctor.dart:190:24)#10     DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:48:39)#11     _AsyncAwaitCompleter.start (dart:async-patch/async_patch.dart:49:6)#12     DoctorCommand.runCommand (package:flutter_tools/src/commands/doctor.dart:34:42)#13     FlutterCommand.verifyThenRunCommand (package:flutter_tools/src/runner/flutter_command.dart:559:18)#14     _asyncThenWrapperHelper.<anonymous closure> (dart:async-patch/async_patch.dart:77:64)#15     _rootRunUnary (dart:async/zone.dart:1132:38)#16     _CustomZone.runUnary (dart:async/zone.dart:1029:19)#17     _FutureListener.handleValue (dart:async/future_impl.dart:126:18)#18     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:639:45)#19     Future._propagateToListeners (dart:async/future_impl.dart:668:32)#20     Future._complete (dart:async/future_impl.dart:473:7)#21     _SyncCompleter.complete (dart:async/future_impl.dart:51:12)#22     _AsyncAwaitCompleter.complete.<anonymous closure> (dart:async-patch/async_patch.dart:33:20)#23     _rootRun (dart:async/zone.dart:1124:13)#24     _CustomZone.run (dart:async/zone.dart:1021:19)#25     _CustomZone.bindCallback.<anonymous closure> (dart:async/zone.dart:947:23)#26     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)#27     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)#28     _runPendingImmediateCallback (dart:isolate-patch/isolate_patch.dart:115:13)#29     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:172:5)

执行命令： ideviceinfo -d 出现如下错误

idevice.c:295 idevice_connect(): ERROR: Connecting to usbmuxd failed: -9 (Bad file descriptor)13:18:45 lockdown.c:663 lockdownd_client_new(): could not connect to lockdownd (device 1a95bb66796dad5ebf6a99d1c87101b5c2214963)13:18:45 lockdown.c:698 lockdownd_client_new_with_handshake(): failed to create lockdownd client.ERROR: Could not connect to lockdownd, error code -8

关于”Could not connect to lockdownd”这个错误，网上出现了很多解决办法，但每个人碰到的error code -8，错误码都不一样。有部分解决办法就是修改权限，对于错误码为 -8 的，一直没有搜到相关解决办法。折腾了一天，其实原因是，开发过程中，我碰到了手机，导致手机数据线松了，然后我更换了一个USB接口，总之是因为手机和电脑没有连接好。如果有碰到这个问题，换个接口，然后撤销iphone手机和电脑的信任，直到连接电脑时弹出信任授权对话框，才算是正常连接成功。一旦出现这个错误，连安卓设备都运行不了。

5、运行时出现

Assertion failed: (AMDeviceIsPaired(device)), function handle_device, file /tmp/ios-deploy-20181117-87168-1goz8ak/ios-deploy-1.9.4/src/ios-deploy/ios-deploy.m, line 1598.Could not install build/ios/iphoneos/Runner.app on 1a95bb66796dad5ebf6a99d1c87101b5c2214963.Try launching Xcode and selecting "Product > Run" to fix the problem: open ios/Runner.xcworkspaceError launching application on iPhone (5).

出现这个错误，直接按提示使用Xcode运行一下项目即可。

6、还有最后一个严重的内存泄漏的问题

错误日志：Signal 11 was raised.

在iOS实现将画面数据传送到Flutter，使用到了CVPixelBufferRef数据。对于这块目前不是很清楚，大概是因为线程安全的问题，在腾讯云播放器回调的数据，随时可能会被释放，而在Flutter回调中使用了已被释放的数据，出现了问题。最后参考了ijk代码，使用了OSAtomicCompareAndSwapPtrBarrier对数据进行验证比较得以解决，对于这个OSAtomicCompareAndSwapPtrBarrier方法也不是很理解，如果有大佬了解的，可以教教我。

如果有错误的地方，希望大佬不吝赐教。

同时希望star一下。项目github地址：https://github.com/RandyWei/flt_video_player