[alsa-devel] distinguish events based on input ports

Hi everybody, I've just started writing my first little program with alsa, and I had a question regarding the use of input(read) ports. What I want to do is distinguish events based on the input port they came through. Since the destination of the event is mostly set to 'broadcast', I cannot extract this information from the event itself. I would like to know if there is another way to do this, or if it is simply impossible. Thanks for your help, Greetings, Lieven