AudioTrack and AudioFlinger send level cleanup

Add an API to control block for getting/setting send level.
This allow us to make the mSendLevel field private.

Document the lack of barriers.

Use 0.0f to initialize floating-point values (for doc only).

Change-Id: I59f83b00adeb89eeee227e7648625d9a835be7a4
3 files changed
tree: 28e36d2cce839d66870ea066a2b334dd9b63c833
  1. camera/
  2. cmds/
  3. drm/
  4. include/
  5. media/
  6. services/