fix(cmcd): only report ltc if playing; round to int

lib/player.js

@@ -5863,12 +5863,13 @@ shaka.Player = class extends shaka.util.FakeEventTarget {
    * is playing.
    */
   getLiveLatency() {
-    if (!this.video_) {
+    if (!this.video_ || !this.video_.currentTime) {
       return null;
     }
     const now = this.getPresentationStartTimeAsDate().getTime() +
       this.video_.currentTime * 1000;
-    return Date.now() - now;
+
+    return Math.floor(Date.now() - now);
   }
 
   /**

test/player_unit.js

@@ -2925,21 +2925,33 @@ describe('Player', () => {
 
       // Load the player with the live manifest.
       await player.load(fakeManifestUri, null, fakeMimeType);
-
-      video.currentTime = 10; // Simulate that we're 10 seconds into playback.
     });
 
     it('returns null if video element does not exist', async () => {
+      video.currentTime = 10; // Simulate that we're 10 seconds into playback.
       await player.detach();
       const latency = player.getLiveLatency();
       expect(latency).toBeNull();
     });
+
+    it('returns null if no position defined yet', async () => {
+      const latency = player.getLiveLatency();
+      expect(latency).toBeNull();
+    });
 
     it('returns correct latency when video is playing', () => {
+      video.currentTime = 10; // Simulate that we're 10 seconds into playback.
       Date.now = () => 2000 * 1000;
       const latency = player.getLiveLatency();
       expect(latency).toBe(990000);
     });
+
+    it('returns integer latency also when Date.now returns float', () => {
+      video.currentTime = 10; // Simulate that we're 10 seconds into playback.
+      Date.now = () => 2000 * 1000.3;
+      const latency = player.getLiveLatency();
+      expect(latency).toBe(990000);
+    });
   });
 
   describe('getStats', () => {