private void Init(string clientName)
{
cbManager = new UnmanagedCallbackManager();
loop = new GLibMainLoop();
GC.SuppressFinalize(loop);
context = new HandleRef(this, pa_context_new(loop.GetAPI(), clientName));
notifyCB = ContextNotifyHandler;
pa_context_set_state_callback(context, notifyCB, new IntPtr(0));
eventCB = SubscriptionEventHandler;
pa_context_set_subscribe_callback(context, eventCB, IntPtr.Zero);
}