Track the media playlist URI when inferring a master playlist

When a media playlist was loaded directly, the URI wasn't being set on the implicit master playlist created by the plugin. That meant that playlist reloads weren't being correctly associated with the old playlist version and merges weren't happening. Now, live media playlists loaded directly should be updated properly after being refreshed and segment URLs are resolved directly against the media playlists when the master playlist is only inferred.

@@ -433,6 +433,7 @@ var
           player.hls.master = {
             playlists: [parser.manifest]
           };
+          parser.manifest.uri = url;
         }
 
         // check the playlist for updates if EXT-X-ENDLIST isn't present
@@ -516,8 +517,13 @@ var
         return;
       }
 
-      segmentUri = resolveUrl(resolveUrl(srcUrl, player.hls.media.uri || ''),
-                              segment.uri);
+      // resolve the segment URL relative to the playlist
+      if (player.hls.media.uri === srcUrl) {
+        segmentUri = resolveUrl(srcUrl, segment.uri);
+      } else {
+        segmentUri = resolveUrl(resolveUrl(srcUrl, player.hls.media.uri || ''),
+                                segment.uri);
+      }
 
       // request the next segment
       segmentXhr = new window.XMLHttpRequest();

@@ -948,7 +948,6 @@ test('merges playlist reloads', function() {
   videojs.mediaSources[player.currentSrc()].trigger({
     type: 'sourceopen'
   });
-  player.hls.media.uri = 'http://example.com/manifest/missingEndlist.m3u8';
 
   callback();
   strictEqual(1, merges, 'reloaded playlist was merged');