api: upgrade audio client to VoiceWS v3

src/Discord.Net.WebSocket/API/Voice/HelloEvent.cs

@@ -0,0 +1,10 @@
+using Newtonsoft.Json;
+
+namespace Discord.API.Voice
+{
+    internal class HelloEvent
+    {
+        [JsonProperty("heartbeat_interval")]
+        public int HeartbeatInterval { get; set; }
+    }
+}

src/Discord.Net.WebSocket/API/Voice/ReadyEvent.cs

@@ -1,5 +1,6 @@
-#pragma warning disable CS1591
+#pragma warning disable CS1591
 using Newtonsoft.Json;
+using System;
 
 namespace Discord.API.Voice
 {
@@ -14,6 +15,7 @@ namespace Discord.API.Voice
         [JsonProperty("modes")]
         public string[] Modes { get; set; }
         [JsonProperty("heartbeat_interval")]
+        [Obsolete("This field is errorneous and should not be used", true)]
         public int HeartbeatInterval { get; set; }
     }
 }

src/Discord.Net.WebSocket/API/Voice/VoiceOpCode.cs

@@ -1,4 +1,4 @@
-#pragma warning disable CS1591
+#pragma warning disable CS1591
 namespace Discord.API.Voice
 {
     internal enum VoiceOpCode : byte
@@ -11,11 +11,19 @@ namespace Discord.API.Voice
         Ready = 2,
         /// <summary> C→S - Used to keep the connection alive and measure latency. </summary>
         Heartbeat = 3,
-        /// <summary> C←S - Used to reply to a client's heartbeat. </summary>
-        HeartbeatAck = 3,
         /// <summary> C←S - Used to provide an encryption key to the client. </summary>
         SessionDescription = 4,
         /// <summary> C↔S - Used to inform that a certain user is speaking. </summary>
-        Speaking = 5
+        Speaking = 5,
+        /// <summary> C←S - Used to reply to a client's heartbeat. </summary>
+        HeartbeatAck = 6,
+        /// <summary> C→S - Used to resume a connection. </summary>
+        Resume = 7,
+        /// <summary> C←S - Used to inform the client the heartbeat interval. </summary>
+        Hello = 8,
+        /// <summary> C←S - Used to acknowledge a resumed connection. </summary>
+        Resumed = 9,
+        /// <summary> C←S - Used to notify that a client has disconnected. </summary>
+        ClientDisconnect = 13,
     }
 }

src/Discord.Net.WebSocket/Audio/AudioClient.cs

@@ -1,4 +1,4 @@
-using Discord.API.Voice;
+using Discord.API.Voice;
 using Discord.Audio.Streams;
 using Discord.Logging;
 using Discord.Net.Converters;
@@ -107,7 +107,7 @@ namespace Discord.Audio
         private async Task OnConnectingAsync()
         {
             await _audioLogger.DebugAsync("Connecting ApiClient").ConfigureAwait(false);
-            await ApiClient.ConnectAsync("wss://" + _url).ConfigureAwait(false);
+            await ApiClient.ConnectAsync("wss://" + _url + "?v=3").ConfigureAwait(false);
             await _audioLogger.DebugAsync("Listening on port " + ApiClient.UdpPort).ConfigureAwait(false);
             await _audioLogger.DebugAsync("Sending Identity").ConfigureAwait(false);
             await ApiClient.SendIdentityAsync(_userId, _sessionId, _token).ConfigureAwait(false);
@@ -216,6 +216,14 @@ namespace Discord.Audio
             {
                 switch (opCode)
                 {
+                    case VoiceOpCode.Hello:
+                        {
+                            await _audioLogger.DebugAsync("Received Hello").ConfigureAwait(false);
+                            var data = (payload as JToken).ToObject<HelloEvent>(_serializer);
+
+                            _heartbeatTask = RunHeartbeatAsync(data.HeartbeatInterval, _connection.CancelToken);
+                        }
+                        break;
                     case VoiceOpCode.Ready:
                         {
                             await _audioLogger.DebugAsync("Received Ready").ConfigureAwait(false);
@@ -225,8 +233,6 @@ namespace Discord.Audio
 
                             if (!data.Modes.Contains(DiscordVoiceAPIClient.Mode))
                                 throw new InvalidOperationException($"Discord does not support {DiscordVoiceAPIClient.Mode}");
-
-                            _heartbeatTask = RunHeartbeatAsync(data.HeartbeatInterval, _connection.CancelToken);
                             
                             ApiClient.SetUdpEndpoint(data.Ip, data.Port);
                             await ApiClient.SendDiscoveryAsync(_ssrc).ConfigureAwait(false);