Added the sidx parsing and test file from mp4 spec

@@ -704,6 +704,54 @@ test('can parse a trun', function() {
             }]);
 });
 
+test('can parse a sidx', function(){
+  var data = box('sidx',
+                0x00, // version
+                0x00, 0x00, 0x00, // flags
+                0x00, 0x00, 0x00, 0x02, // reference_ID
+                0x00, 0x00, 0x00, 0x01, // timescale
+                0x01, 0x02, 0x03, 0x04, // earliest_presentation_time
+                0x00, 0x00, 0x00, 0x00, // first_offset
+                0x00, 0x00,             // reserved
+                0x00, 0x02,             // reference_count
+                // first reference
+                0x80, 0x00, 0x00, 0x07, // reference_type(1) + referenced_size(31)
+                0x00, 0x00, 0x00, 0x08, // subsegment_duration
+                0x80, 0x00, 0x00, 0x09, // starts_with_SAP(1) + SAP_type(3) + SAP_delta_time(28)
+                // second reference
+                0x00, 0x00, 0x00, 0x03, // reference_type(1) + referenced_size(31)
+                0x00, 0x00, 0x00, 0x04, // subsegment_duration
+                0x10, 0x00, 0x00, 0x05 // starts_with_SAP(1) + SAP_type(3) + SAP_delta_time(28)
+      );
+  deepEqual(videojs.inspectMp4(new Uint8Array(data)),
+            [{
+              type: 'sidx',
+              version: 0,
+              flags: new Uint8Array([0, 0x00, 0x00]),
+              timescale: 1,
+              earliestPresentationTime: 0x01020304,
+              firstOffset: 0,
+              referenceId: 2,
+              size: 56,
+              references: [{
+                referenceType: 1,
+                referencedSize: 7,
+                subsegmentDuration: 8,
+                startsWithSap: true,
+                sapType: 0,
+                sapDeltaTime: 9
+                },{
+                referenceType: 0,
+                referencedSize: 3,
+                subsegmentDuration: 4,
+                startsWithSap: false,
+                sapType: 1,
+                sapDeltaTime: 5
+                }]
+             
+            }]);
+});
+
 test('can parse a series of boxes', function() {
   var ftyp = [
     0x00, 0x00, 0x00, 0x18 // size 4 * 6 = 24

@@ -266,6 +266,33 @@ var
         initialDelay: view.getUint32(8)
       };
     },
+    sidx: function(data) {
+      var view = new DataView(data.buffer, data.byteOffset, data.byteLength),
+          result = {
+            version: data[0],
+            flags: new Uint8Array(data.subarray(1, 4)),
+            references: [],
+            referenceId: view.getUint32(4),
+            timescale: view.getUint32(8),
+            earliestPresentationTime: view.getUint32(12),
+            firstOffset: view.getUint32(16)
+          },
+          referenceCount = view.getUint16(22),
+          i;
+
+      for (i = 24; referenceCount; i += 12, referenceCount-- ) {
+        result.references.push({
+          referenceType: (data[i] & 0x80) >>> 7,
+          referencedSize: view.getUint32(i) & 0x7FFFFFFF,
+          subsegmentDuration: view.getUint32(i + 4),
+          startsWithSap: !!(data[i + 8] & 0x80),
+          sapType: (data[i + 8] & 0x70) >>> 4,
+          sapDeltaTime: view.getUint32(i + 8) & 0x0FFFFFFF
+        });
+      }
+      
+      return result;
+    },
     stbl: function(data) {
       return {
         boxes: videojs.inspectMp4(data)