update DVR Window Range for livestreams with infinite window size

Author: IcoDeveloper

app/js/mss/MssFragmentController.js

@@ -100,20 +100,22 @@ Mss.dependencies.MssFragmentController = function() {
                 return;
             }
             // In case of live streams, update segment timeline according to DVR window
-            else if (manifest.timeShiftBufferDepth && manifest.timeShiftBufferDepth > 0) {
+            else if ((manifest.timeShiftBufferDepth && manifest.timeShiftBufferDepth > 0) || manifest.canSeek ) {
                 // Get timestamp of the last segment
                 segment = segments[segments.length - 1];
                 t = segment.t;
 
                 // Determine the segments' availability start time
                 availabilityStartTime = t - (manifest.timeShiftBufferDepth * timescale);
 
-                // Remove segments prior to availability start time
-                segment = segments[0];
-                while (segment.t < availabilityStartTime) {
-                    this.debug.log("[MssFragmentController][" + type + "] Remove segment  - t = " + (segment.t / timescale));
-                    segments.splice(0, 1);
+                if (manifest.timeShiftBufferDepth > 0) {
+                    // Remove segments prior to availability start time
                     segment = segments[0];
+                    while (segment.t < availabilityStartTime) {
+                        this.debug.log("[MssFragmentController][" + type + "] Remove segment  - t = " + (segment.t / timescale));
+                        segments.splice(0, 1);
+                        segment = segments[0];
+                    }
                 }
 
                 // Update DVR window range => set range's end to end time of current segment

app/js/mss/MssParser.js

@@ -567,6 +567,8 @@ Mss.dependencies.MssParser = function() {
             mpd.timescale = timescale ? parseFloat(timescale) : DEFAULT_TIME_SCALE;
             var isLive = this.domParser.getAttributeValue(smoothNode, 'IsLive');
             mpd.type = (isLive !== null && isLive.toLowerCase() === 'true') ? 'dynamic' : 'static';
+            var canSeek = this.domParser.getAttributeValue(smoothNode, 'CanSeek');          
+            mpd.canSeek = (canSeek !== null && canSeek.toLowerCase() === 'true');           
             mpd.timeShiftBufferDepth = parseFloat(this.domParser.getAttributeValue(smoothNode, 'DVRWindowLength')) / mpd.timescale;
             var duration = parseFloat(this.domParser.getAttributeValue(smoothNode, 'Duration'));