AudioServer: Let ASMixer notify ASClientConnection about finished buffers.

Instead of posting a message directly from ASMixer, notify the client via
ASClientConnection::did_finish_playing_buffer().

Servers/AudioServer/ASClientConnection.cpp

@@ -1,17 +1,17 @@
 #include "ASClientConnection.h"
 #include "ASMixer.h"
 
-#include <LibCore/CEventLoop.h>
-#include <LibAudio/ASAPI.h>
 #include <LibAudio/ABuffer.h>
+#include <LibAudio/ASAPI.h>
+#include <LibCore/CEventLoop.h>
 #include <SharedBuffer.h>
 
 #include <errno.h>
-#include <unistd.h>
-#include <sys/uio.h>
-#include <sys/types.h>
-#include <sys/socket.h>
 #include <stdio.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
 
 ASClientConnection::ASClientConnection(CLocalSocket& client_socket, int client_id, ASMixer& mixer)
     : Connection(client_socket, client_id)
@@ -63,3 +63,10 @@ bool ASClientConnection::handle_message(const ASAPI_ClientMessage& message, cons
     return true;
 }
 
+void ASClientConnection::did_finish_playing_buffer(Badge<ASMixer>, int buffer_id)
+{
+    ASAPI_ServerMessage reply;
+    reply.type = ASAPI_ServerMessage::Type::FinishedPlayingBuffer;
+    reply.playing_buffer.buffer_id = buffer_id;
+    post_message(reply);
+}

Servers/AudioServer/ASClientConnection.h

@@ -13,6 +13,8 @@ public:
     void send_greeting() override;
     bool handle_message(const ASAPI_ClientMessage&, const ByteBuffer&& = {}) override;
 
+    void did_finish_playing_buffer(Badge<ASMixer>, int buffer_id);
+
 private:
     ASMixer& m_mixer;
 };

Servers/AudioServer/ASMixer.cpp

@@ -1,7 +1,6 @@
 #include <AK/BufferStream.h>
 #include <AudioServer/ASClientConnection.h>
 #include <AudioServer/ASMixer.h>
-#include <LibAudio/ASAPI.h>
 #include <LibCore/CThread.h>
 #include <limits>
 
@@ -78,12 +77,8 @@ void ASMixer::mix()
 
             // clear it later
             if (buffer.pos == sample_count) {
-                if (buffer.m_client) {
-                    ASAPI_ServerMessage reply;
-                    reply.type = ASAPI_ServerMessage::Type::FinishedPlayingBuffer;
-                    reply.playing_buffer.buffer_id = buffer.buffer->shared_buffer_id();
-                    buffer.m_client->post_message(reply);
-                }
+                if (buffer.m_client)
+                    buffer.m_client->did_finish_playing_buffer({}, buffer.buffer->shared_buffer_id());
                 buffer.done = true;
             }
         }