fix(voice): properly ignore non-voice packets (#1302)

Author: davidffa

lib/voice/VoiceConnection.js

@@ -561,6 +561,10 @@ class VoiceConnection extends EventEmitter {
 
     registerReceiveEventHandler() {
         this.udpSocket.on("message", (msg) => {
+            if(msg[1] !== 0x78) { // unknown payload type, ignore
+                return;
+            }
+
             const nonce = Buffer.alloc(24);
             msg.copy(nonce, 0, 0, 12);
             let data;
@@ -586,11 +590,7 @@ class VoiceConnection extends EventEmitter {
             // Not a RFC5285 One Byte Header Extension (not negotiated)
             if(hasExtension) { // RFC3550 5.3.1: RTP Header Extension
                 const l = data[2] << 8 | data[3];
-                let index = 4 + l * 4;
-                while(data[index] == 0) {
-                    ++index;
-                }
-                data = data.subarray(index);
+                data = data.subarray(4 + l * 4);
             }
             if(this.receiveStreamOpus) {
                 /**