Parse sdtp boxes

Add an inspector function for sdtp boxes.

@@ -766,6 +766,33 @@ test('can parse a trun with per-sample flags', function() {
 
 
 });
 });
 
 
+test('can parse an sdtp', function() {
+  var data = box('sdtp',
+                 0x00, // version
+                 0x00, 0x00, 0x00, // flags
+                 // reserved + sample_depends_on +
+                 // sample_is_dependend_on + sample_has_redundancy
+                 0x15,
+                 // reserved + sample_depends_on +
+                 // sample_is_dependend_on + sample_has_redundancy
+                 0x27);
+  deepEqual(videojs.inspectMp4(new Uint8Array(data)), [{
+    type: 'sdtp',
+    version: 0,
+    flags: new Uint8Array([0, 0, 0]),
+    size: 14,
+    samples: [{
+      sampleDependsOn: 1,
+      sampleIsDependedOn: 1,
+      sampleHasRedundancy: 1
+    }, {
+      sampleDependsOn: 2,
+      sampleIsDependedOn: 1,
+      sampleHasRedundancy: 3
+    }]
+  }]);
+});
+
 test('can parse a sidx', function(){
 test('can parse a sidx', function(){
   var data = box('sidx',
   var data = box('sidx',
                 0x00, // version
                 0x00, // version

@@ -277,6 +277,23 @@ var
         initialDelay: view.getUint32(8)
         initialDelay: view.getUint32(8)
       };
       };
     },
     },
+    sdtp: function(data) {
+      var
+        result = {
+          version: data[0],
+          flags: new Uint8Array(data.subarray(1, 4)),
+          samples: []
+        }, i;
+
+      for (i = 4; i < data.byteLength; i++) {
+        result.samples.push({
+          sampleDependsOn: (data[i] & 0x30) >> 4,
+          sampleIsDependedOn: (data[i] & 0x0c) >> 2,
+          sampleHasRedundancy: data[i] & 0x03
+        });
+      }
+      return result;
+    },
     sidx: function(data) {
     sidx: function(data) {
       var view = new DataView(data.buffer, data.byteOffset, data.byteLength),
       var view = new DataView(data.buffer, data.byteOffset, data.byteLength),
           result = {
           result = {
@@ -301,7 +318,7 @@ var
           sapDeltaTime: view.getUint32(i + 8) & 0x0FFFFFFF
           sapDeltaTime: view.getUint32(i + 8) & 0x0FFFFFFF
         });
         });
       }
       }
-      
+
       return result;
       return result;
     },
     },
     stbl: function(data) {
     stbl: function(data) {