Add option to watch caption track changes and update language options

readme.md

@@ -303,7 +303,7 @@ Note the single quotes encapsulating the JSON and double quotes on the object ke
 | `invertTime`         | Boolean                    | `true`                                                                                                                         | Display the current time as a countdown rather than an incremental counter.                                                                                                                                                                                                                                                                                            |
 | `toggleInvert`       | Boolean                    | `true`                                                                                                                         | Allow users to click to toggle the above.                                                                                                                                                                                                                                                                                                                              |
 | `listeners`          | Object                     | `null`                                                                                                                         | Allows binding of event listeners to the controls before the default handlers. See the `defaults.js` for available listeners. If your handler prevents default on the event (`event.preventDefault()`), the default handler will not fire.                                                                                                                             |
-| `captions`           | Object                     | `{ active: false, language: window.navigator.language.split('-')[0] }`                                                         | `active`: Toggles if captions should be active by default. `language`: Sets the default language to load (if available).                                                                                                                                                                                                                                               |
+| `captions`           | Object                     | `{ active: false, language: browser language, update: false  }`                                                         | `active`: Toggles if captions should be active by default. `language`: Sets the default language to load (if available). `update`: Listen to changes to tracks and update menu. This is needed for some streaming libraries, but can result in unselectable language options).                                                                                                                                                                                                                                               |
 | `fullscreen`         | Object                     | `{ enabled: true, fallback: true, iosNative: false }`                                                                          | `enabled`: Toggles whether fullscreen should be enabled. `fallback`: Allow fallback to a full-window solution. `iosNative`: whether to use native iOS fullscreen when entering fullscreen (no custom controls)                                                                                                                                                         |
 | `ratio`              | String                     | `16:9`                                                                                                                         | The aspect ratio you want to use for embedded players.                                                                                                                                                                                                                                                                                                                 |
 | `storage`            | Object                     | `{ enabled: true, key: 'plyr' }`                                                                                               | `enabled`: Allow use of local storage to store user settings. `key`: The key name to use.                                                                                                                                                                                                                                                                              |

src/js/captions.js

@@ -83,6 +83,11 @@ const captions = {
         // Set toggled state
         this.toggleCaptions(active);
 
+        // Watch changes to textTracks and update captions menu
+        if (this.config.captions.update) {
+            utils.on(this.media.textTracks, 'change', captions.update.bind(this));
+        }
+
         // Update available languages in list
         captions.update.call(this);
     },

src/js/defaults.js

@@ -116,6 +116,9 @@ const defaults = {
     captions: {
         active: false,
         language: (navigator.language || navigator.userLanguage).split('-')[0],
+        // Listen to new tracks added after Plyr is initialized.
+        // This is needed for streaming captions, but may result in unselectable options
+        update: false,
     },
 
     // Fullscreen settings