add artplayer-plugin-dash-quality

docs/assets/example/dash.quality.js

@@ -0,0 +1,34 @@
+var art = new Artplayer({
+    container: '.artplayer-app',
+    url: 'https://dash.akamaized.net/akamai/bbb_30fps/bbb_30fps.mpd',
+    setting: true,
+    plugins: [
+        artplayerPluginDashQuality({
+            // Show quality in control
+            control: true,
+
+            // Show quality in setting
+            setting: true,
+
+            // Get the resolution text from level
+			getResolution: (level) => level.height + 'P',
+
+            // I18n
+            title: 'Quality',
+            auto: 'Auto',
+        }),
+    ],
+    customType: {
+        mpd: function playMpd(video, url, art) {
+            if (dashjs.supportsMediaSource()) {
+                const dash = dashjs.MediaPlayer().create();
+                dash.initialize(video, url, art.option.autoplay);
+                art.dash = dash; 
+                art.once('url', () => dash.destroy());
+                art.once('destroy', () => dash.destroy());
+            } else {
+                art.notice.show = 'Unsupported playback format: mpd';
+            }
+        }
+    },
+});