Add processors for stts and ctts

Dash-Industry-Forum · Aug 14, 2019 · 36f0b80 · 36f0b80
1 parent b2dc9b1
commit 36f0b80
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diff --git a/src/processors/ctts.js b/src/processors/ctts.js
@@ -0,0 +1,9 @@
+// ISO/IEC 14496-12:2012 - 8.6.1.3 Composition Time To Sample Box
+ISOBox.prototype._boxProcessors['ctts'] = function() {
+  this._procFullBox();
+  this._procField('entry_count', 'uint', 32);
+  this._procEntries('entries', this.entry_count, function(entry) {
+    this._procEntryField(entry, 'sample_count', 'uint', 32);
+    this._procEntryField(entry, 'sample_offset', (this.version === 1) ? 'int' : 'uint', 32);
+  });
+};
diff --git a/src/processors/stts.js b/src/processors/stts.js
@@ -0,0 +1,9 @@
+// ISO/IEC 14496-12:2012 - 8.6.1.2 Decoding Time To Sample Box
+ISOBox.prototype._boxProcessors['stts'] = function() {
+  this._procFullBox();
+  this._procField('entry_count', 'uint', 32);
+  this._procEntries('entries', this.entry_count, function(entry) {
+    this._procEntryField(entry, 'sample_count', 'uint', 32);
+    this._procEntryField(entry, 'sample_delta', 'uint', 32);
+  });
+};
diff --git a/test/fixtures/time_to_sample.mp4 b/test/fixtures/time_to_sample.mp4
diff --git a/test/spec/boxes_spec.js b/test/spec/boxes_spec.js
@@ -242,6 +242,48 @@ describe('trex box', function() {
   });
 });
 
+describe('stts box', function() {
+  it('should correctly parse the box', function() {
+    var parsedFile  = loadParsedFixture('./test/fixtures/editlist.mp4');
+    var boxes = parsedFile.fetchAll('stts');
+    var box = boxes[0];
+
+    expect(boxes.length).toEqual(1);
+
+    expect(box.type).toEqual('stts');
+    expect(box.entry_count).toEqual(2);
+    expect(box.entries.length).toEqual(2);
+    expect(box.entries[0].sample_count).toEqual(47);
+    expect(box.entries[0].sample_delta).toEqual(1024);
+    expect(box.entries[1].sample_count).toEqual(1);
+    expect(box.entries[1].sample_delta).toEqual(896);
+  });
+});
+
+describe('ctts box', function() {
+  it('should correctly parse the box', function() {
+    var parsedFile  = loadParsedFixture('./test/fixtures/time_to_sample.mp4');
+    var boxes = parsedFile.fetchAll('ctts');
+    var box = boxes[0];
+
+    expect(boxes.length).toEqual(1);
+
+    expect(box.type).toEqual('ctts');
+    expect(box.entry_count).toEqual(5);
+    expect(box.entries.length).toEqual(5);
+    expect(box.entries[0].sample_count).toEqual(1);
+    expect(box.entries[0].sample_offset).toEqual(1024);
+    expect(box.entries[1].sample_count).toEqual(1);
+    expect(box.entries[1].sample_offset).toEqual(2560);
+    expect(box.entries[2].sample_count).toEqual(1);
+    expect(box.entries[2].sample_offset).toEqual(1024);
+    expect(box.entries[3].sample_count).toEqual(1);
+    expect(box.entries[3].sample_offset).toEqual(0);
+    expect(box.entries[4].sample_count).toEqual(1);
+    expect(box.entries[4].sample_offset).toEqual(512);
+  });
+});
+
 describe('Text samples', function() {
   describe('vttc box', function() {
     it('should correctly parse the box from sample data', function() {