First release

node_modules/mux.js/es/tools/parse-tfhd.js

@@ -0,0 +1,56 @@
+var tfhd = function tfhd(data) {
+  var view = new DataView(data.buffer, data.byteOffset, data.byteLength),
+      result = {
+    version: data[0],
+    flags: new Uint8Array(data.subarray(1, 4)),
+    trackId: view.getUint32(4)
+  },
+      baseDataOffsetPresent = result.flags[2] & 0x01,
+      sampleDescriptionIndexPresent = result.flags[2] & 0x02,
+      defaultSampleDurationPresent = result.flags[2] & 0x08,
+      defaultSampleSizePresent = result.flags[2] & 0x10,
+      defaultSampleFlagsPresent = result.flags[2] & 0x20,
+      durationIsEmpty = result.flags[0] & 0x010000,
+      defaultBaseIsMoof = result.flags[0] & 0x020000,
+      i;
+  i = 8;
+
+  if (baseDataOffsetPresent) {
+    i += 4; // truncate top 4 bytes
+    // FIXME: should we read the full 64 bits?
+
+    result.baseDataOffset = view.getUint32(12);
+    i += 4;
+  }
+
+  if (sampleDescriptionIndexPresent) {
+    result.sampleDescriptionIndex = view.getUint32(i);
+    i += 4;
+  }
+
+  if (defaultSampleDurationPresent) {
+    result.defaultSampleDuration = view.getUint32(i);
+    i += 4;
+  }
+
+  if (defaultSampleSizePresent) {
+    result.defaultSampleSize = view.getUint32(i);
+    i += 4;
+  }
+
+  if (defaultSampleFlagsPresent) {
+    result.defaultSampleFlags = view.getUint32(i);
+  }
+
+  if (durationIsEmpty) {
+    result.durationIsEmpty = true;
+  }
+
+  if (!baseDataOffsetPresent && defaultBaseIsMoof) {
+    result.baseDataOffsetIsMoof = true;
+  }
+
+  return result;
+};
+
+module.exports = tfhd;