Adjust tfhd size for data offsets

Added 16 bytes to the tfhd to specify some default sample configuration so the data offset calculation in the trun must be adjusted to match. Audio now works for my test file. Copy Uint8Arrays used for deepEqual() tests because phantomjs considers two typed arrays with non-equal offsets to be non-equal.

@@ -539,7 +539,7 @@ traf = function(track) {
   // the data offset specifies the number of bytes from the start of
   // the containing moof to the first payload byte of the associated
   // mdat
-  dataOffset = (16 + // tfhd
+  dataOffset = (32 + // tfhd
                 16 + // tfdt
                 8 +  // traf header
                 16 + // mfhd

@@ -537,7 +537,7 @@ test('generates a moof for audio', function() {
   deepEqual(moof[0].boxes[1].boxes.length, 3, 'generated three traf children');
   trun = moof[0].boxes[1].boxes[2];
   ok(trun, 'generated a trun');
-  deepEqual(trun.dataOffset, data.byteLength + 8, 'calculated the data offset');
+  equal(trun.dataOffset, data.byteLength + 8, 'calculated the data offset');
   deepEqual(trun.samples, [{
     duration: 9000,
     size: 10

@@ -997,7 +997,9 @@ test('generates AAC frame events from ADTS bytes', function() {
   });
 
   equal(frames.length, 1, 'generated one frame');
-  deepEqual(frames[0].data, new Uint8Array([0x12, 0x34]), 'extracted AAC frame');
+  deepEqual(new Uint8Array(frames[0].data),
+            new Uint8Array([0x12, 0x34]),
+            'extracted AAC frame');
   equal(frames[0].channelcount, 2, 'parsed channelcount');
   equal(frames[0].samplerate, 44100, 'parsed samplerate');
 
@@ -1036,7 +1038,7 @@ test('parses across packets', function() {
   });
 
   equal(frames.length, 2, 'parsed two frames');
-  deepEqual(frames[1].data,
+  deepEqual(new Uint8Array(frames[1].data),
             new Uint8Array([0x9a, 0xbc]),
             'extracted the second AAC frame');
 });