stream-controller: account for level sliding when computing buffer En…

…d PDT related to video-dev#1624 video-dev#1626
shaibam · Mar 27, 2018 · 6a9f928 · 6a9f928
1 parent 9b429dc
commit 6a9f928
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/src/controller/stream-controller.js b/src/controller/stream-controller.js
@@ -443,7 +443,8 @@ class StreamController extends TaskLoop {
       if (!levelDetails.programDateTime) { // Uses buffer and sequence number to calculate switch segment (required if using EXT-X-DISCONTINUITY-SEQUENCE)
         foundFrag = this._findFragmentBySN(fragPrevious, fragments, bufferEnd, end);
       } else { // Relies on PDT in order to switch bitrates (Support EXT-X-DISCONTINUITY without EXT-X-DISCONTINUITY-SEQUENCE)
-        foundFrag = this._findFragmentByPDT(fragments, (bufferEnd * 1000) + (levelDetails.programDateTime ? Date.parse(levelDetails.programDateTime) : 0));
+        // compute PDT of bufferEnd: PDT(bufferEnd) = 1000*bufferEnd + PDT(start) = 1000*bufferEnd + PDT(level) - level sliding
+        foundFrag = this._findFragmentByPDT(fragments, (bufferEnd * 1000) + (levelDetails.programDateTime ? Date.parse(levelDetails.programDateTime) : 0) - 1000 * start);
       }
     } else {
       // reach end of playlist