fix(FEC-7392 FEC-7882): Live+DVR - unavailable time shown in the seekbar

src/hls-adapter.js

@@ -601,15 +601,29 @@ export default class HlsAdapter extends BaseMediaSourceAdapter {
   }
 
   /**
-   * Get the duration in seconds.
-   * @returns {Number} - The playback duration.
+   * Get the start time of DVR window in live playback in seconds.
+   * @returns {Number} - start time of DVR window.
    * @public
    */
-  get duration(): number {
+  getStartTimeOfDvrWindow(): number {
     if (this.isLive()) {
-      return this._getLiveEdge();
+      try {
+        const nextLoadLevel = this._hls.levels[this._hls.nextLoadLevel],
+          details = nextLoadLevel.details,
+          fragments = details.fragments,
+          fragLength = fragments.length,
+          start = fragments[0].start + fragments[0].duration,
+          end = fragments[fragLength - 1].start + fragments[fragLength - 1].duration,
+          maxLatency = this._hls.config.liveMaxLatencyDuration !== undefined ? this._hls.config.liveMaxLatencyDuration : this._hls.config.liveMaxLatencyDurationCount * details.targetduration,
+          minPosToSeek = Math.max(start - this._hls.config.maxFragLookUpTolerance, end - maxLatency);
+        return minPosToSeek;
+      }
+      catch (e) {
+        HlsAdapter._logger.debug('Unable obtain the start of DVR window');
+        return 0;
+      }
     } else {
-      return super.duration;
+      return 0;
     }
   }
 }

test/src/hls-adapter.spec.js

@@ -527,11 +527,10 @@ describe('HlsAdapter Instance - seekToLiveEdge', function () {
   });
 });
 
-describe('HlsAdapter Instance - get duration', function () {
+describe('HlsAdapter Instance - _getLiveEdge', function () {
 
   let hlsAdapterInstance;
   let video;
-  let vodSource = hls_sources.ElephantsDream;
   let liveSource = hls_sources.Live;
   let config;
   let sandbox;
@@ -552,37 +551,43 @@ describe('HlsAdapter Instance - get duration', function () {
     });
   });
 
-  it('should return video tag duration for VOD', (done) => {
-    hlsAdapterInstance = HlsAdapter.createAdapter(video, vodSource, config);
+  it('should return live edge for liveSyncDuration = 60', (done) => {
+    config.playback.options.html5.hls.liveSyncDuration = 60;
+    hlsAdapterInstance = HlsAdapter.createAdapter(video, liveSource, config);
     hlsAdapterInstance.load().then(() => {
       hlsAdapterInstance._videoElement.addEventListener('durationchange', () => {
-        if (isNaN(video.duration)) {
+        if (video.duration > 60) {
+          hlsAdapterInstance._getLiveEdge().should.be.equal(video.duration - 60);
           done();
         } else {
-          hlsAdapterInstance.duration.should.be.equal(video.duration);
-          done();
+          hlsAdapterInstance._getLiveEdge().should.be.equal(0);
         }
       });
     });
   });
 
-  it('should return live duration for live', (done) => {
+  it('should return live edge for liveSyncDurationCount = 5', (done) => {
+    config.playback.options.html5.hls.liveSyncDurationCount = 5;
     hlsAdapterInstance = HlsAdapter.createAdapter(video, liveSource, config);
     hlsAdapterInstance.load().then(() => {
       hlsAdapterInstance._videoElement.addEventListener('durationchange', () => {
-        if (video.duration > 40) {
-          hlsAdapterInstance.duration.should.be.equal(video.duration - 3 * hlsAdapterInstance._hls.levels[0].details.targetduration);
+        let delay = 5 * hlsAdapterInstance._hls.levels[0].details.targetduration;
+        if (video.duration > delay) {
+          hlsAdapterInstance._getLiveEdge().should.be.equal(video.duration - delay);
           done();
+        } else {
+          hlsAdapterInstance._getLiveEdge().should.be.equal(0);
         }
       });
     });
   });
 });
 
-describe('HlsAdapter Instance - _getLiveEdge', function () {
+describe('HlsAdapter Instance - getStartTimeOfDvrWindow', function () {
 
   let hlsAdapterInstance;
   let video;
+  let vodSource = hls_sources.ElephantsDream;
   let liveSource = hls_sources.Live;
   let config;
   let sandbox;
@@ -603,34 +608,19 @@ describe('HlsAdapter Instance - _getLiveEdge', function () {
     });
   });
 
-  it('should return live edge for liveSyncDuration = 60', (done) => {
-    config.playback.options.html5.hls.liveSyncDuration = 60;
-    hlsAdapterInstance = HlsAdapter.createAdapter(video, liveSource, config);
+  it('should return 0 for VOD', (done) => {
+    hlsAdapterInstance = HlsAdapter.createAdapter(video, vodSource, config);
     hlsAdapterInstance.load().then(() => {
-      hlsAdapterInstance._videoElement.addEventListener('durationchange', () => {
-        if (video.duration > 60) {
-          hlsAdapterInstance._getLiveEdge().should.be.equal(video.duration - 60);
-          done();
-        } else {
-          hlsAdapterInstance._getLiveEdge().should.be.equal(0);
-        }
-      });
+      hlsAdapterInstance.getStartTimeOfDvrWindow().should.equal(0);
+      done();
     });
   });
 
-  it('should return live edge for liveSyncDurationCount = 5', (done) => {
-    config.playback.options.html5.hls.liveSyncDurationCount = 5;
+  it('should return the start of DVR window for live', (done) => {
     hlsAdapterInstance = HlsAdapter.createAdapter(video, liveSource, config);
     hlsAdapterInstance.load().then(() => {
-      hlsAdapterInstance._videoElement.addEventListener('durationchange', () => {
-        let delay = 5 * hlsAdapterInstance._hls.levels[0].details.targetduration;
-        if (video.duration > delay) {
-          hlsAdapterInstance._getLiveEdge().should.be.equal(video.duration - delay);
-          done();
-        } else {
-          hlsAdapterInstance._getLiveEdge().should.be.equal(0);
-        }
-      });
+      hlsAdapterInstance.getStartTimeOfDvrWindow().should.not.equal(0);
+      done();
     });
   });
 });