It's treated as 5.1 + 2 aux channels. This allows AL_DIRECT_CHANNELS_SOFT to
behave better, not forwarding rear left/right channel inputs to lower front and
upper rear, and allows reporting a more appropriate output mode to the app
instead of 7.1.
This one is a regular layout first-order dual-band decoder, which excludes the
front-center (to maintain regularity). The previous was a second-order single-
band decoder, which included front-center.
Chris Robinson