audio: add rtp sequence number on incoming frames

fippo · fippo · commit 73472cd78c0c · 2022-09-29T17:51:04.000+02:00
where it is easily available.
diff --git a/index.bs b/index.bs
@@ -299,6 +299,7 @@ dictionary RTCEncodedAudioFrameMetadata {
     unsigned long synchronizationSource;
     octet payloadType;
     sequence&lt;unsigned long&gt; contributingSources;
+    short? sequenceNumber; // RTP sequence number on incoming frames.
 };
 
 [Exposed=(Window,DedicatedWorker)]
