tree 824a23a9ffbebb3ace63146c171e938df6630fdd
parent 303db9de6506db0c2b300863c39ece81721dd4e9
author Eric Laurent <elaurent@google.com> 1426631372 -0700
committer Eric Laurent <elaurent@google.com> 1428541691 -0700

audio policy: volume control reorganization

Output volume and routing control by AudioOutputDescriptor
is reorganized to prepare hardware source volume and routing
control.
AudioOutputDescriptor contains all volume, device and activity
state common to software (audio flinger mixers) and
hardware sources (tuners, A2DP, HDMI).
A new class SwAudioOutputDescriptor is derived from
AudioOutputDescriptor and is specific to software sources.

Low level routing and volume control methods receive an
AudioOutputDescriptor parameter instead of an IO handle.

mPrimaryOutput is now an AudioOutputDescriptor.

Change-Id: Ie90943ee3102cdb8adf89fdd2addd2c279b1e5bf