Started adding audio receive

src/Discord.Net.WebSocket/Entities/Channels/SocketVoiceChannel.cs

@@ -42,13 +42,7 @@ namespace Discord.WebSocket
 
         public async Task<IAudioClient> ConnectAsync()
         {
-            var audioMode = Discord.AudioMode;
-            if (audioMode == AudioMode.Disabled)
-                throw new InvalidOperationException($"Audio is not enabled on this client, {nameof(DiscordSocketConfig.AudioMode)} in {nameof(DiscordSocketConfig)} must be set.");
-
-            return await Guild.ConnectAudioAsync(Id,
-                (audioMode & AudioMode.Incoming) == 0,
-                (audioMode & AudioMode.Outgoing) == 0).ConfigureAwait(false);
+            return await Guild.ConnectAudioAsync(Id, false, false).ConfigureAwait(false);
         }
 
         public override SocketGuildUser GetUser(ulong id)

src/Discord.Net.WebSocket/Entities/Guilds/SocketGuild.cs

@@ -426,9 +426,23 @@ namespace Discord.WebSocket
         internal SocketVoiceState AddOrUpdateVoiceState(ClientState state, VoiceStateModel model)
         {
             var voiceChannel = state.GetChannel(model.ChannelId.Value) as SocketVoiceChannel;
-            var voiceState = SocketVoiceState.Create(voiceChannel, model);
-            _voiceStates[model.UserId] = voiceState;
-            return voiceState;
+            var before = GetVoiceState(model.UserId) ?? SocketVoiceState.Default;
+            var after = SocketVoiceState.Create(voiceChannel, model);
+            _voiceStates[model.UserId] = after;
+
+            if (before.VoiceChannel?.Id != after.VoiceChannel?.Id)
+            {
+                if (model.UserId == CurrentUser.Id)
+                    RepopulateAudioStreams();
+                else
+                {
+                    _audioClient?.RemoveInputStream(model.UserId); //User changed channels, end their stream
+                    if (CurrentUser.VoiceChannel != null && after.VoiceChannel?.Id == CurrentUser.VoiceChannel?.Id)
+                        _audioClient.CreateInputStream(model.UserId);
+                }
+            }
+
+            return after;
         }
         internal SocketVoiceState? GetVoiceState(ulong id)
         {
@@ -446,6 +460,10 @@ namespace Discord.WebSocket
         }
 
         //Audio
+        internal AudioInStream GetAudioStream(ulong userId)
+        {
+            return _audioClient?.GetInputStream(userId);
+        }
         internal async Task<IAudioClient> ConnectAudioAsync(ulong channelId, bool selfDeaf, bool selfMute)
         {
             selfDeaf = false;
@@ -531,6 +549,7 @@ namespace Discord.WebSocket
                         }
                     };
                     _audioClient = audioClient;
+                    RepopulateAudioStreams();
                 }
                 _audioClient.Connected += () => 
                 { 
@@ -554,6 +573,22 @@ namespace Discord.WebSocket
             }
         }
 
+        internal void RepopulateAudioStreams()
+        {
+            if (_audioClient != null)
+            {
+                _audioClient.ClearInputStreams(); //We changed channels, end all current streams
+                if (CurrentUser.VoiceChannel != null)
+                {
+                    foreach (var pair in _voiceStates)
+                    {
+                        if (pair.Value.VoiceChannel?.Id == CurrentUser.VoiceChannel?.Id)
+                            _audioClient.CreateInputStream(pair.Key);
+                    }
+                }
+            }
+        }
+
         public override string ToString() => Name;
         private string DebuggerDisplay => $"{Name} ({Id})";
         internal SocketGuild Clone() => MemberwiseClone() as SocketGuild;

src/Discord.Net.WebSocket/Entities/Users/SocketGuildUser.cs

@@ -1,4 +1,5 @@
-using Discord.Rest;
+using Discord.Audio;
+using Discord.Rest;
 using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
@@ -37,6 +38,7 @@ namespace Discord.WebSocket
         public SocketVoiceChannel VoiceChannel => VoiceState?.VoiceChannel;
         public string VoiceSessionId => VoiceState?.VoiceSessionId ?? "";
         public SocketVoiceState? VoiceState => Guild.GetVoiceState(Id);
+        public AudioInStream AudioStream => Guild.GetAudioStream(Id);
 
         /// <summary> The position of the user within the role hirearchy. </summary>
         /// <remarks> The returned value equal to the position of the highest role the user has,