feat: stss atom parsing (#380)

videojs · Mar 29, 2021 · 305eb4f · 305eb4f
1 parent b75a7a4
commit 305eb4f
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Showing 3 changed files with 31 additions and 5 deletions.
diff --git a/lib/tools/mp4-inspector.js b/lib/tools/mp4-inspector.js
@@ -443,6 +443,21 @@ var
       }
       return result;
     },
+    stss: function(data) {
+      var
+        view = new DataView(data.buffer, data.byteOffset, data.byteLength),
+        result = {
+          version: view.getUint8(0),
+          flags: new Uint8Array(data.subarray(1, 4)),
+          syncSamples: []
+        },
+        entryCount = view.getUint32(4),
+        i;
+      for (i = 8; entryCount; i += 4, entryCount--) {
+        result.syncSamples.push(view.getUint32(i));
+      }
+      return result;
+    },
     stco: function(data) {
       var
         view = new DataView(data.buffer, data.byteOffset, data.byteLength),

diff --git a/test/mp4-inspector.test.js b/test/mp4-inspector.test.js
@@ -215,7 +215,7 @@ QUnit.test('can parse a moov', function(assert) {
   var result = QUnit.dump.parse(mp4.tools.inspect(new Uint8Array(data)));
   var expected = QUnit.dump.parse([{
     type: 'moov',
-    size: 1109,
+    size: 1129,
     boxes: [{
       type: 'mvhd',
       version: 1,
@@ -231,7 +231,7 @@ QUnit.test('can parse a moov', function(assert) {
       nextTrackId: 2
     }, {
       type: 'trak',
-      size: 499,
+      size: 519,
       boxes: [{
         type: 'tkhd',
         flags: new Uint8Array([0, 0, 0]),
@@ -263,7 +263,7 @@ QUnit.test('can parse a moov', function(assert) {
         }]
       }, {
         type: 'mdia',
-        size: 351,
+        size: 371,
         boxes: [{
           type: 'mdhd',
           version: 1,
@@ -283,7 +283,7 @@ QUnit.test('can parse a moov', function(assert) {
           size: 37
         }, {
           type: 'minf',
-          size: 262,
+          size: 282,
           boxes: [{
             type: 'dinf',
             size: 36,
@@ -301,7 +301,7 @@ QUnit.test('can parse a moov', function(assert) {
             }]
           }, {
             type: 'stbl',
-            size: 218,
+            size: 238,
             boxes: [{
               type: 'stsd',
               size: 114,
@@ -357,6 +357,12 @@ QUnit.test('can parse a moov', function(assert) {
               version: 1,
               flags: new Uint8Array([0, 0, 0]),
               chunkOffsets: [1]
+            }, {
+              type: 'stss',
+              size: 20,
+              version: 0,
+              flags: new Uint8Array([0, 0, 0]),
+              syncSamples: [1]
             }, {
               type: 'ctts',
               size: 24,

diff --git a/test/utils/mp4-helpers.js b/test/utils/mp4-helpers.js
@@ -195,6 +195,11 @@ module.exports.sampleMoov =
                           0x00, 0x00, 0x00, // flags
                           0x00, 0x00, 0x00, 0x01, // entry_count
                           0x00, 0x00, 0x00, 0x01), // chunk_offset
+                      box('stss',
+                          0x00, // version 0
+                          0x00, 0x00, 0x00, // flags
+                          0x00, 0x00, 0x00, 0x01, // entry_count
+                          0x00, 0x00, 0x00, 0x01), // sync_sample
                       box('ctts',
                           0x00, // version 0
                           0x00, 0x00, 0x00, // flags