add timecode field to encoding

packages/ddp/src/index.ts

@@ -174,6 +174,15 @@ export function encode(packet: DDPPacket): Uint8Array {
   view.setUint32(4, packet.header.dataOffset);
   view.setUint16(8, packet.header.dataLength);
 
+  if(packet.header.flags.timecode){
+    if(packet.header.timecode !== undefined){
+      view.setUint16(10, packet.header.timecode?.seconds)
+      view.setUint16(12, packet.header.timecode?.fractionalSeconds)
+    }else{
+      throw new Error("DDP packet had timecode flag set but no timecode value supplied")
+    }
+  }
+
   // const bytes = new Uint8Array([flagByte, sequenceNumberByte, dataTypeByte, packet.header.sourceOrDestinationID])
   const headerBytes = new Uint8Array(view.buffer, view.byteOffset, view.byteLength);
 

packages/ddp/tests/encode.test.js

@@ -29,6 +29,36 @@ const goodTests = [
       data: new Uint8Array([]),
     },
   },
+  {
+    description: 'DDP packet with timecode',
+    expected: new Uint8Array([0x50, 0x0f, 0x92, 0x01, 0x45, 0x67, 0x89, 0x10, 0x10, 0x11, 0x10, 0x11, 0x11, 0x10]),
+    packet: {
+      header: {
+        flags: {
+          version: 1,
+          timecode: true,
+          storage: false,
+          reply: false,
+          query: false,
+          push: false,
+        },
+        sequenceNumber: 15,
+        dataType: {
+          standard: false,
+          type: 2,
+          bitsPerPixel: 4,
+        },
+        sourceOrDestinationID: 1,
+        dataOffset: 1164413200,
+        dataLength: 4113,
+        timecode: {
+          seconds: 4113,
+          fractionalSeconds: 4368,
+        },
+      },
+      data: new Uint8Array([]),
+    },
+  },
 ];
 
 const badTests = [];