feat: adaptive bitrate support, engine improvements, demo updates, and electron preload

public/demo/intro/1080p/index.m3u8

@@ -0,0 +1,7 @@
+#EXTM3U
+#EXT-X-VERSION:3
+#EXT-X-TARGETDURATION:6
+#EXT-X-MEDIA-SEQUENCE:0
+#EXTINF:6.000000,
+seg_000.ts
+#EXT-X-ENDLIST

public/demo/intro/480p/index.m3u8

@@ -0,0 +1,7 @@
+#EXTM3U
+#EXT-X-VERSION:3
+#EXT-X-TARGETDURATION:6
+#EXT-X-MEDIA-SEQUENCE:0
+#EXTINF:6.000000,
+seg_000.ts
+#EXT-X-ENDLIST

public/demo/intro/720p/index.m3u8

@@ -0,0 +1,7 @@
+#EXTM3U
+#EXT-X-VERSION:3
+#EXT-X-TARGETDURATION:6
+#EXT-X-MEDIA-SEQUENCE:0
+#EXTINF:6.000000,
+seg_000.ts
+#EXT-X-ENDLIST

public/scenes/demo.json

@@ -128,6 +128,11 @@
     "intro": {
       "id": "intro",
       "videoUrl": "intro/intro.mp4",
+      "streamingUrl": {
+        "超清 (1080P)": "intro/1080p/index.m3u8",
+        "高清 (720P)": "intro/720p/index.m3u8",
+        "标清 (480P)": "intro/480p/index.m3u8"
+      },
       "subtitleUrl": "intro/intro.vtt",
       "subtitles": {
         "zh": "intro/intro.vtt",