stream-controller: don't start loading first fragment if first LEVEL_…

…LOADED not received yet

fix EXT-X-START not honored on single level playlist
related to #1353

regression introduced by 8db8ea3

src/controller/stream-controller.js

@@ -182,12 +182,12 @@ class StreamController extends EventHandler {
           config = hls.config,
           media = this.media;
 
-    // if video not attached AND
-    // start fragment already requested OR start frag prefetch disable
-    // exit loop
-    // => if start level loaded and media not attached but start frag prefetch is enabled and start frag not requested yet, we will not exit loop
-    if (this.levelLastLoaded !== undefined && !media &&
-      (this.startFragRequested || !config.startFragPrefetch)) {
+
+    // if start level not parsed yet OR
+    // if video not attached AND start fragment already requested OR start frag prefetch disable
+    // exit loop, as we either need more info (level not parsed) or we need media to be attached to load new fragment
+    if (this.levelLastLoaded === undefined || (
+      !media && (this.startFragRequested || !config.startFragPrefetch))) {
       return;
     }
 
@@ -411,7 +411,7 @@ class StreamController extends EventHandler {
       //  return -1             return 0                 return 1
       //logger.log(`level/sn/start/end/bufEnd:${level}/${candidate.sn}/${candidate.start}/${(candidate.start+candidate.duration)}/${bufferEnd}`);
       // Set the lookup tolerance to be small enough to detect the current segment - ensures we don't skip over very small segments
-      let candidateLookupTolerance = Math.min(maxFragLookUpTolerance, candidate.duration);
+      let candidateLookupTolerance = Math.min(maxFragLookUpTolerance, candidate.duration + (candidate.deltaPTS ? candidate.deltaPTS : 0));
       if (candidate.start + candidate.duration - candidateLookupTolerance <= bufferEnd) {
         return 1;
       } // if maxFragLookUpTolerance will have negative value then don't return -1 for first element
@@ -892,7 +892,6 @@ class StreamController extends EventHandler {
       logger.log('both AAC/HE-AAC audio found in levels; declaring level codec as HE-AAC');
     }
     this.levels = data.levels;
-    this.startLevelLoaded = false;
     this.startFragRequested = false;
     let config = this.config;
     if (config.autoStartLoad || this.forceStartLoad) {