fix(FEC-8711): live in IE has a small jump in the stream after a seco…

…nd (#67)

* realying on loaded metadata instead of shaka loaded

* change to readyState > 0

readystate=1 means metadata loaded.

on the first play, it already goes to the live edge.

* fix test

src/dash-adapter.js

@@ -623,10 +623,8 @@ export default class DashAdapter extends BaseMediaSourceAdapter {
    * @public
    */
   seekToLiveEdge(): void {
-    if (this._shaka && this._loadPromise) {
-      this._loadPromise.then(() => {
-        this._videoElement.currentTime = this._shaka.seekRange().end;
-      });
+    if (this._shaka && this._videoElement.readyState > 0) {
+      this._videoElement.currentTime = this._shaka.seekRange().end;
     }
   }
 

test/src/dash-adapter.spec.js

@@ -950,10 +950,10 @@ describe('DashAdapter: seekToLiveEdge', () => {
       .load()
       .then(() => {
         try {
-          video.currentTime = dashInstance._shaka.seekRange().start;
-          const initialTimeShift = dashInstance._shaka.seekRange().end - video.currentTime;
-          dashInstance.seekToLiveEdge();
-          dashInstance._loadPromise.then(() => {
+          video.play().then(() => {
+            video.currentTime = dashInstance._shaka.seekRange().start;
+            const initialTimeShift = dashInstance._shaka.seekRange().end - video.currentTime;
+            dashInstance.seekToLiveEdge();
             const timeShift = dashInstance._shaka.seekRange().end - video.currentTime;
             timeShift.should.be.lessThan(3);
             timeShift.should.be.lessThan(initialTimeShift);