Don't abort a playlist request just to re-issue the same request

Check the outstanding request URL before aborting playlist requests when a switch is requested. Don't filter out requests that are generated as a result of another request finishing in the switcher simulator. Actual playlist switching is showing up in the graph now.

@@ -147,10 +147,17 @@
           return;
         }
 
+
+
         loader.state = 'SWITCHING_MEDIA';
 
-        // abort any outstanding playlist refreshes
+        // there is already an outstanding playlist request
         if (request) {
+          if (resolveUrl(loader.master.uri, playlist.uri) === request.url) {
+            // requesting to switch to the same playlist multiple times
+            // has no effect after the first
+            return;
+          }
           request.abort();
           request = null;
         }

@@ -563,6 +563,7 @@ xhr = videojs.Hls.xhr = function(url, callback) {
 
   request = new window.XMLHttpRequest();
   request.open(options.method, url);
+  request.url = url;
 
   if (options.responseType) {
     request.responseType = options.responseType;

@@ -349,6 +349,27 @@
     strictEqual(requests.length, 0, 'no requests is sent');
   });
 
+  test('does not abort requests when the same playlist is re-requested', function() {
+    var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
+    requests.pop().respond(200, null,
+                           '#EXTM3U\n' +
+                           '#EXT-X-STREAM-INF:BANDWIDTH=1\n' +
+                           'low.m3u8\n' +
+                           '#EXT-X-STREAM-INF:BANDWIDTH=2\n' +
+                           'high.m3u8\n');
+    requests.pop().respond(200, null,
+                           '#EXTM3U\n' +
+                           '#EXT-X-MEDIA-SEQUENCE:0\n' +
+                           '#EXTINF:10,\n' +
+                           'low-0.ts\n' +
+                           '#EXT-X-ENDLIST\n');
+    loader.media('high.m3u8');
+    loader.media('high.m3u8');
+
+    strictEqual(requests.length, 1, 'made only one request');
+    ok(!requests[0].aborted, 'request not aborted');
+  });
+
   test('throws an error if a media switch is initiated too early', function() {
     var loader = new videojs.Hls.PlaylistLoader('master.m3u8');
 

@@ -135,7 +135,7 @@
         var master = '#EXTM3U\n' +
               options.playlists.reduce(function(playlists, value) {
                 return playlists +
-                  '#EXT-X-STREAM-INF:' + value + '\n' +
+                  '#EXT-X-STREAM-INF:BANDWIDTH=' + value + '\n' +
                   'playlist-' + value + '\n';
               }, ''),
             buffered = 0,
@@ -171,26 +171,23 @@
           });
 
           // deliver responses if they're ready
-          requests = requests.reduce(function(remaining, request) {
+          requests.forEach(function(request, i) {
             var arrival = request.startTime + propagationDelay,
-                segmentSize = +request.url.match(/(\d+)-\d+$/)[1] * segmentDuration;
+                segmentSize;
 
             // playlist responses
             if (/playlist-\d+$/.test(request.url)) {
-              // playlist responses have no trasmission time
+              // for simplicity, playlist responses have zero trasmission time
               if (t === arrival) {
                 request.respond(200, null, playlistResponse(+requests[0].url.match(/\d+$/)));
-                return remaining;
+                // the request is completed
+                return requests.splice(requests.indexOf(request), 1);
               }
-              // the response has not arrived. re-enqueue it for later.
-              return remaining.concat(request);
+              return;
             }
 
             // segment responses
-            if (t >= arrival) {
-              request.delivered += results.bandwidth[t].bandwidth;
-
-            }
+            segmentSize = +request.url.match(/(\d+)-\d+$/)[1] * segmentDuration;
             // segment response headers arrive after the propogation delay
             if (t === arrival) {
               results.playlists.push({
@@ -205,12 +202,18 @@
             if (request.delivered >= segmentSize) {
               buffered += segmentDuration;
               request.status = 200;
-              request.response = new Uint8Array(segmentSize);
+              request.response = new Uint8Array(segmentSize * 0.125);
               request.setResponseBody('');
-              return remaining;
+              // the request is completed
+              return requests.splice(requests.indexOf(request), 1);
+            }
+            // transmit the bits for this tick
+            if (t >= arrival) {
+              request.delivered += results.bandwidth[t].bandwidth;
+
             }
-            // response has not arrived fully, re-enqueue it for later
-            return remaining.concat(request);
+            // response has not arrived fully
+            return;
           }, []);
 
           // simulate playback