First release

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

@@ -0,0 +1,44 @@
+var MAX_UINT32 = Math.pow(2, 32);
+
+var parseSidx = function parseSidx(data) {
+  var view = new DataView(data.buffer, data.byteOffset, data.byteLength),
+      result = {
+    version: data[0],
+    flags: new Uint8Array(data.subarray(1, 4)),
+    references: [],
+    referenceId: view.getUint32(4),
+    timescale: view.getUint32(8)
+  },
+      i = 12;
+
+  if (result.version === 0) {
+    result.earliestPresentationTime = view.getUint32(i);
+    result.firstOffset = view.getUint32(i + 4);
+    i += 8;
+  } else {
+    // read 64 bits
+    result.earliestPresentationTime = view.getUint32(i) * MAX_UINT32 + view.getUint32(i + 4);
+    result.firstOffset = view.getUint32(i + 8) * MAX_UINT32 + view.getUint32(i + 12);
+    i += 16;
+  }
+
+  i += 2; // reserved
+
+  var referenceCount = view.getUint16(i);
+  i += 2; // start of references
+
+  for (; referenceCount > 0; i += 12, referenceCount--) {
+    result.references.push({
+      referenceType: (data[i] & 0x80) >>> 7,
+      referencedSize: view.getUint32(i) & 0x7FFFFFFF,
+      subsegmentDuration: view.getUint32(i + 4),
+      startsWithSap: !!(data[i + 8] & 0x80),
+      sapType: (data[i + 8] & 0x70) >>> 4,
+      sapDeltaTime: view.getUint32(i + 8) & 0x0FFFFFFF
+    });
+  }
+
+  return result;
+};
+
+module.exports = parseSidx;