[Bug 759558] osxaudiosrc/osaudiosink uses non-unique identifiers as device ID

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759558

--- Comment #1 from Marcin Lewandowski <marcin at saepia.net> ---
Moreover, this can be more dangerous.

If I unplug my Z-10 USB Speakers and plug something else, the same ID gets
allocated by totally another device.

$ say -a ?
   50 Built-in Output
   60 Sennheiser USB Headset

So I you build let's say, a DAW that should remember it's audio interface
routing setup (it's painful to rebuild it every time) and be smart enough that
if user plugs a device during runtime it is capable of recognizing it, now you
can

a) store IDs in the routing configuration but you can never be sure if they
mean the same soundcard as was used before
b) rely on device names

both options are unreliable.

Moreover if I plug two of these three devices, then unplug one of them, ID of
them can change in the runtime!

(plug Sennheiser USB)

$ say -a ?
   50 Built-in Output
   60 Sennheiser USB Headset

(plug Z-10 USB Speaker)

$ say -a ?
   50 Built-in Output
   68 Z-10 USB Speaker
   60 Sennheiser USB Headset

(unplug Sennheiser USB)

$ say -a ?
   50 Built-in Output
   60 Z-10 USB Speaker

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