feat: Video receiver (1/n)

src/client/voice/VoiceConnection.js

@@ -106,7 +106,7 @@ class VoiceConnection extends EventEmitter {
 
     /**
      * Map SSRC values to user IDs
-     * @type {Map<number, Snowflake>}
+     * @type {Map<number, { userId: Snowflake, speaking: boolean, hasVideo: boolean }>}
      * @private
      */
     this.ssrcMap = new Map();
@@ -513,6 +513,7 @@ class VoiceConnection extends EventEmitter {
     ws.on('ready', this.onReady.bind(this));
     ws.on('sessionDescription', this.onSessionDescription.bind(this));
     ws.on('startSpeaking', this.onStartSpeaking.bind(this));
+    ws.on('startStreaming', this.onStartStreaming.bind(this));
 
     this.sockets.ws.connect();
   }
@@ -569,6 +570,32 @@ class VoiceConnection extends EventEmitter {
     });
   }
 
+  onStartStreaming({ video_ssrc, user_id, audio_ssrc }) {
+    this.ssrcMap.set(+audio_ssrc, {
+      ...(this.ssrcMap.get(+audio_ssrc) || {}),
+      userId: user_id,
+      hasVideo: Boolean(video_ssrc), // Maybe ?
+    });
+    /**
+{
+  video_ssrc: 0,
+  user_id: 'uid',
+  streams: [
+    {
+      ssrc: 27734,
+      rtx_ssrc: 27735,
+      rid: '100',
+      quality: 100,
+      max_resolution: [Object],
+      max_framerate: 60,
+      active: false
+    }
+  ],
+  audio_ssrc: 27733
+}
+     */
+  }
+
   /**
    * Invoked when a speaking event is received.
    * @param {Object} data The received data

src/client/voice/dispatcher/BaseDispatcher.js

@@ -255,6 +255,7 @@ class BaseDispatcher extends Writable {
    * Discord seems to send this extension on every video packet
    * @see https://webrtc.googlesource.com/src/+/refs/heads/main/docs/native-code/rtp-hdrext/playout-delay
    * @returns {Buffer} playout-delay extension
+   * Buffer <be de 00 01 51 00 00 00>
    * @private
    */
   createHeaderExtension() {

src/client/voice/networking/VoiceWebSocket.js

@@ -214,6 +214,14 @@ class VoiceWebSocket extends EventEmitter {
          */
         this.emit('startSpeaking', packet.d);
         break;
+      case VoiceOpcodes.SOURCES:
+        /**
+         * Emitted whenever a streaming packet is received.
+         * @param {Object} data
+         * @event VoiceWebSocket#startStreaming
+         */
+        this.emit('startStreaming', packet.d);
+        break;
       default:
         /**
          * Emitted when an unhandled packet is received.