public void AddListener(AudioQueueProperty id, AudioQueuePropertyChanged callback)
{
if (callback == null)
{
throw new ArgumentNullException("callback");
}
if (listeners == null)
{
listeners = new Hashtable();
}
lock (listeners){
var a = (ArrayList)listeners [id];
if (a == null)
{
AudioQueueAddPropertyListener(handle, id, property_changed, GCHandle.ToIntPtr(gch));
listeners [id] = a = new ArrayList();
}
a.Add(callback);
}
}
public void RemoveListener(AudioQueueProperty id, AudioQueuePropertyChanged callback)
{
if (callback == null)
{
throw new ArgumentNullException("callback");
}
if (listeners == null)
{
return;
}
lock (listeners){
var a = (ArrayList)listeners [id];
if (a == null)
{
return;
}
a.Remove(callback);
if (a.Count == 0)
{
AudioQueueRemovePropertyListener(handle, id, property_changed, GCHandle.ToIntPtr(gch));
}
}
}