add speed control options

filter.php

@@ -33,6 +33,7 @@ class filter_vdocipher extends moodle_text_filter
     private static $playerTheme;
     private static $width;
     private static $height;
+    private static $speedOptions;
     public function filter($text, array $options = array())
     {
         self::$csk = get_config('filter_vdocipher', 'csk');
@@ -47,6 +48,7 @@ public function filter($text, array $options = array())
             self::$playerTheme = '9ae8bbe8dd964ddc9bdb932cca1cb59a';
         }
         self::$watermark = get_config('filter_vdocipher', 'watermark');
+        self::$speedOptions = get_config('filter_vdocipher', 'speedOptions');
         if (strpos($text, '[vdo ') === false) {
             return $text;
         }
@@ -145,10 +147,37 @@ function eval_date($matches)
 });
 	</script>
 EOF;
+            }
+            if (self::validSpeed()) {
+                $speedOptions = self::$speedOptions;
+                $output .= <<<EOF
+<script>
+    function onVdoCipherAPIReady() {
+      var allVideos = vdo.getObjects();
+      var video_ = allVideos[allVideos.length - 1];
+      video_.addEventListener('load', function () {
+        video_.availablePlaybackRates = [$speedOptions]
+      });
+    }
+</script>
+EOF;
+
             }
             return $output;
         }, $text);
     }
+
+    private static function validSpeed() {
+        if (!self::$speedOptions) return false;
+        $speeds = explode(',', self::$speedOptions);
+        foreach ($speeds as $speed) {
+            if (!is_numeric($speed)) return false;
+            $floatSpeed = floatval($speed);
+            if ($floatSpeed < 0.2 || $floatSpeed > 2.5) return false;
+        }
+        return true;
+    }
+
     private function vdo_otp($video, $otp_post_array = [])
     {
         $client_key = self::$csk;

lang/en/filter_vdocipher.php

@@ -34,7 +34,10 @@
 $string['playerVersion_desc'] = 'Setting to 1.x uses the latest and recommended video player version';
 
 $string['playerTheme'] = 'Player Theme';
-$string['playerTheme_desc'] = 'This is the player theme. Available player themes are listed in the  <a href="https://www.vdocipher.com/blog/2018/10/video-player-themes/" target="_blank">Custom player skin page</a>';
+$string['playerTheme_desc'] = 'This is the player theme.';
+
+$string['speedOptions'] = 'Speed options';
+$string['speedOptions_desc'] = 'Change the player menu for speed. Accepts comma-separated string with each value between 0.2 to 2.5. Can cause error if invalid.';
 
 $string['watermark'] = 'Watermark JSON';
 $string['watermark_desc'] = '(Optional) Watermark to be applied to the videos. For details on writing the annotation code <a href="https://www.vdocipher.com/blog/2014/12/add-text-to-videos-with-watermark/" target="_blank"> check this out. </a>';

settings.php

@@ -26,9 +26,7 @@
     'filter_vdocipher/csk',
     get_string('csk', 'filter_vdocipher'),
     get_string('csk_desc', 'filter_vdocipher'),
-    null,
-    PARAM_NOTAGS,
-    64
+    null
 ));
 
 $settings->add(new admin_setting_configtext(
@@ -58,14 +56,22 @@
     32
 ));
 
+$settings->add(new admin_setting_configtext(
+    'filter_vdocipher/speedOptions',
+    get_string('speedOptions', 'filter_vdocipher'),
+    get_string('speedOptions_desc', 'filter_vdocipher'),
+    '',
+    PARAM_NOTAGS,
+    32
+));
+
 $settings->add(new admin_setting_configtext(
     'filter_vdocipher/playerTheme',
     get_string('playerTheme', 'filter_vdocipher'),
     get_string('playerTheme_desc', 'filter_vdocipher'),
     '9ae8bbe8dd964ddc9bdb932cca1cb59a',
     PARAM_NOTAGS,
-    64,
-    2
+    64
 ));
 
 $settings->add(new admin_setting_configtextarea(