Merge branch 'buffer-controller-ts' of github.com:itsjamie/hls.js int…

…o buffer-controller-ts

src/controller/buffer-controller.ts

@@ -133,7 +133,7 @@ class BufferController extends EventHandler {
     }
   }
 
-  onManifestParsed (data: any) {
+  onManifestParsed (data: { altAudio: boolean }) {
     // in case of alt audio 2 BUFFER_CODECS events will be triggered, one per stream controller
     // sourcebuffers will be created all at once when the expected nb of tracks will be reached
     // in case alt audio is not used, only one BUFFER_CODEC event will be fired from main stream controller
@@ -478,7 +478,7 @@ class BufferController extends EventHandler {
   }
 
   onLevelUpdated ({ details }: { details: { totalduration: number, targetduration?: number, averagetargetduration?: number, live: boolean, fragments: any[] } }) {
-    if (details.fragments.length <= 0) {
+    if (details.fragments.length > 0) {
       this._levelDuration = details.totalduration + details.fragments[0].start;
       this._levelTargetDuration = details.averagetargetduration || details.targetduration || 10;
       this._live = details.live;