Resolves #370 Camera stream support

lib/entities/camera/widgets/camera_stream_view.dart

@@ -10,19 +10,73 @@ class CameraStreamView extends StatefulWidget {
 
 class _CameraStreamViewState extends State<CameraStreamView> {
 
+  CameraEntity _entity;
+  String streamUrl = "";
+  WebViewController webViewController;
+  VideoPlayerController videoPlayerController;
+  Timer monitorTimer;
+  bool started = false;
+  double aspectRatio = 1.78;
+
   @override
   void initState() {
     super.initState();
   }
 
-  CameraEntity _entity;
-  String streamUrl = "";
-  WebViewController webViewController;
+  void loadStreamUrl() {
+    setState((){
+      started = true;
+    });
+    Logger.d("[Camera Player] Loading stream url");
+    HomeAssistant().getCameraStream(_entity.entityId)
+      .then((data) {
+        Logger.d("[Camera Player] Stream url: ${ConnectionManager().httpWebHost}${data["url"]}");
+        if (videoPlayerController != null) {
+          videoPlayerController.dispose().then((_) => createPlayer(data));
+        } else {
+          createPlayer(data);
+        }
+      })
+      .catchError((e) => Logger.e("[Camera Player] $e"));
+  }
 
-  launchStream() {
-    Launcher.launchURLInCustomTab(
-      context: context,
-      url: streamUrl
+  void createPlayer(data) {
+    videoPlayerController = VideoPlayerController.network("${ConnectionManager().httpWebHost}${data["url"]}");
+    videoPlayerController.initialize().then((_) {
+      setState((){
+        aspectRatio = videoPlayerController.value.aspectRatio;
+      });
+      autoPlay();
+      startMonitor();
+    }).catchError((e) {
+      Logger.e("[Camera Player] Error player init. Retrying");
+      loadStreamUrl();
+    });
+  }
+
+  void autoPlay() {
+    if (!videoPlayerController.value.isPlaying) {
+      videoPlayerController.play();
+    }
+  }
+
+  void startMonitor() {
+    monitorTimer = Timer.periodic(Duration(milliseconds: 500), (timer) {
+      if (videoPlayerController.value.hasError) {
+        setState(() {
+          timer.cancel();
+          started = false;
+        });
+      }
+    });
+  }
+
+  Widget buildLoading() {
+    return AspectRatio(
+      aspectRatio: aspectRatio,
+      child: Center(
+          child: CircularProgressIndicator()
+        )
     );
   }
 
@@ -32,29 +86,45 @@ class _CameraStreamViewState extends State<CameraStreamView> {
           .of(context)
           .entityWrapper
           .entity;
-    streamUrl = '${ConnectionManager().httpWebHost}/api/camera_proxy_stream/${_entity
-        .entityId}?token=${_entity.attributes['access_token']}';
-    return AspectRatio(
-      aspectRatio: 1.33,
-      child: WebView(
-        initialUrl: streamUrl,
-        initialMediaPlaybackPolicy: AutoMediaPlaybackPolicy.always_allow,
-        debuggingEnabled: Logger.isInDebugMode,
-        javascriptMode: JavascriptMode.unrestricted,
-        onWebViewCreated: (WebViewController controller) {
-          webViewController = controller;
-        },
-        onPageStarted: (url) {
-          rootBundle.loadString('assets/js/cameraImgViewHelper.js').then((js){
-            webViewController.evaluateJavascript(js);
-          });
-        },
-      ),
-    );
+    if (_entity.supportStream && !started) {
+      loadStreamUrl();
+      return buildLoading();
+    } else if (_entity.supportStream && started) {
+      if (videoPlayerController.value.initialized) {
+        return AspectRatio(
+          aspectRatio: aspectRatio,
+          child: VideoPlayer(videoPlayerController),
+        );
+      } else {
+        return buildLoading();
+      }
+    } else {
+      streamUrl = '${ConnectionManager().httpWebHost}/api/camera_proxy_stream/${_entity
+          .entityId}?token=${_entity.attributes['access_token']}';
+      return AspectRatio(
+        aspectRatio: 1.33,
+        child: WebView(
+          initialUrl: streamUrl,
+          initialMediaPlaybackPolicy: AutoMediaPlaybackPolicy.always_allow,
+          debuggingEnabled: Logger.isInDebugMode,
+          javascriptMode: JavascriptMode.unrestricted,
+          onWebViewCreated: (WebViewController controller) {
+            webViewController = controller;
+          },
+          onPageStarted: (url) {
+            rootBundle.loadString('assets/js/cameraImgViewHelper.js').then((js){
+              webViewController.evaluateJavascript(js);
+            });
+          },
+        ),
+      );
+    }     
   }
 
   @override
   void dispose() {
+    monitorTimer?.cancel();
+    videoPlayerController?.dispose();
     super.dispose();
   }
 }