dependencyID
An adaptation set that is delivering an associated audio service must not be
decoded and presented to the listener on its own, but must always be mixed with the decoded audio
from the adaptation set that is delivering the corresponding main audio service. Therefore, the
adaptation set that is delivering the associated audio service includes a dependencyID
descriptor. This descriptor indicates the
relationship of the associated audio service with the main audio service that it will be mixed
with after decoding.