Fix regression with enableText

samples/captioning/caption_vtt.html

@@ -19,6 +19,7 @@
 
             player = dashjs.MediaPlayer({}).create();
             player.initialize(video, url, true);
+            player.setTextDefaultEnabled(true);
         }
     </script>
 

samples/captioning/multi-track-captions.html

@@ -28,6 +28,7 @@
 
             player = dashjs.MediaPlayer().create();
             player.initialize(videoElement, url, true);
+            player.setTextDefaultEnabled(true);
             player.setInitialMediaSettingsFor('fragmentedText', { 
                 lang: 'swe'
             });

samples/captioning/ttml-ebutt-sample.html

@@ -33,6 +33,7 @@
 
             player = dashjs.MediaPlayer().create();
             player.initialize(videoElement, url, true);
+            player.setTextDefaultEnabled(true);
             player.attachTTMLRenderingDiv(TTMLRenderingDiv);
             controlbar = new ControlBar(player); // Checkout ControlBar.js for more info on how to target/add text tracks to UI
             controlbar.initialize();

src/streaming/text/TextController.js

@@ -59,6 +59,8 @@ function TextController() {
         textDefaultEnabled, // this is used for default settings (each time a file is loaded, we check value of this settings )
         allTracksAreDisabled, // this is used for one session (when a file has been loaded, we use this settings to enable/disable text)
         forceTextStreaming,
+        textTracksAdded,
+        disableTextBeforeTextTracksAdded,
         previousPeriodSelectedTrack;
 
     function setup() {
@@ -67,6 +69,8 @@ function TextController() {
         lastEnabledIndex = -1;
         textDefaultEnabled = false;
         forceTextStreaming = false;
+        textTracksAdded = false;
+        disableTextBeforeTextTracksAdded = false;
         textTracks = TextTracks(context).getInstance();
         vttParser = VTTParser(context).getInstance();
         ttmlParser = TTMLParser(context).getInstance();
@@ -196,7 +200,7 @@ function TextController() {
             });
         }
 
-        if (!textDefaultEnabled) {
+        if (!textDefaultEnabled || disableTextBeforeTextTracksAdded) {
             // disable text at startup
             this.setTextTrack(-1);
         }
@@ -207,6 +211,7 @@ function TextController() {
             index: index,
             tracks: tracks
         });
+        textTracksAdded = true;
     }
 
     function setTextDefaultEnabled(enable) {
@@ -216,6 +221,8 @@ function TextController() {
         if (!textDefaultEnabled) {
             // disable text at startup
             this.setTextTrack(-1);
+        } else {
+            allTracksAreDisabled = false;
         }
     }
 
@@ -225,18 +232,24 @@ function TextController() {
 
     function enableText(enable) {
         checkParameterType(enable,'boolean');
-
+        if (!textDefaultEnabled && enable) {
+            textDefaultEnabled = true;
+        }
         if (isTextEnabled() !== enable) {
             // change track selection
             if (enable) {
-                // apply last enabled tractk
+                // apply last enabled track
                 this.setTextTrack(lastEnabledIndex);
             }
 
             if (!enable) {
                 // keep last index and disable text track
                 lastEnabledIndex = this.getCurrentTrackIdx();
-                this.setTextTrack(-1);
+                if (!textTracksAdded) {
+                    disableTextBeforeTextTracksAdded = true;
+                } else {
+                    this.setTextTrack(-1);
+                }
             }
         }
     }
@@ -331,7 +344,9 @@ function TextController() {
     }
 
     function resetInitialSettings() {
-        allTracksAreDisabled = false;
+        allTracksAreDisabled = true;
+        textTracksAdded = false;
+        disableTextBeforeTextTracksAdded = false;
     }
 
     function reset() {

test/unit/streaming.text.TextController.js

@@ -148,13 +148,13 @@ describe('TextController', function () {
         it('should enable/disable text', function () {
 
             let textEnabled = textController.isTextEnabled();
-            expect(textEnabled).to.equal(true); // jshint ignore:line
-
-            textController.enableText(false);
-            expect(textController.isTextEnabled()).to.equal(false); // jshint ignore:line
+            expect(textEnabled).to.equal(false); // jshint ignore:line
 
             textController.enableText(true);
             expect(textController.isTextEnabled()).to.equal(true); // jshint ignore:line
+
+            textController.enableText(false);
+            expect(textController.isTextEnabled()).to.equal(false); // jshint ignore:line
         });
     });