Clear key DRM update

CHANGELOG.md

@@ -12,6 +12,7 @@
 * Fixed progress bar issue where position could be set above video duration.
 * Fixed iOS remote notification command issue.
 * Removed duplicated page in example app (by https://github.com/pinguluk)
+* Added support for clear key DRM (by https://github.com/tinusneethling)
 
 ## 0.0.72
 * Updated ExoPlayer version

docs/drmconfiguration.md

@@ -47,7 +47,7 @@ BetterPlayerDataSource _fairplayDataSource = BetterPlayerDataSource(
 );
 ```
 
-ClearKey:
+ClearKey (only supported in Android):
 
 A ClearKey MP4 file can be generated with MP4Box as follow:
 

example/lib/pages/clearkey_page.dart

@@ -105,7 +105,7 @@ class _ClearKeyState extends State<ClearKeyPage> {
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("ClearKey player"),
+        title: Text("ClearKey DRM"),
       ),
       body: SingleChildScrollView(
         child: Column(

example/lib/pages/welcome_page.dart

@@ -156,12 +156,12 @@ class _WelcomePageState extends State<WelcomePage> {
       _buildExampleElementWidget("DRM", () {
         _navigateToPage(DrmPage());
       }),
+      _buildExampleElementWidget("ClearKey DRM", () {
+        _navigateToPage(ClearKeyPage());
+      }),
       _buildExampleElementWidget("DASH", () {
         _navigateToPage(DashPage());
       }),
-      _buildExampleElementWidget("ClearKey", () {
-        _navigateToPage(ClearKeyPage());
-      }),
     ];
   }
 

lib/src/controls/better_player_material_progress_bar.dart

@@ -171,13 +171,22 @@ class _ProgressBarPainter extends CustomPainter {
     if (!value.initialized) {
       return;
     }
-    final double playedPartPercent =
+    double playedPartPercent =
         value.position.inMilliseconds / value.duration!.inMilliseconds;
+    if (playedPartPercent.isNaN){
+      playedPartPercent = 0;
+    }
     final double playedPart =
         playedPartPercent > 1 ? size.width : playedPartPercent * size.width;
     for (final DurationRange range in value.buffered) {
-      final double start = range.startFraction(value.duration!) * size.width;
-      final double end = range.endFraction(value.duration!) * size.width;
+      double start = range.startFraction(value.duration!) * size.width;
+      if (start.isNaN){
+        start = 0;
+      }
+      double end = range.endFraction(value.duration!) * size.width;
+      if (end.isNaN){
+        end = 0;
+      }
       canvas.drawRRect(
         RRect.fromRectAndRadius(
           Rect.fromPoints(