audioflinger: OffloadThread state fix

When switching from one offload session to another that
reuses the same offload output, audio HAL is paused & flushed in
preparation for the new track.

OffloadThread must reset mHwPaused to allow proper state transitions
for the second track.

CRs-Fixed: 578165
Change-Id: I8173845e1782b5a8b372a82c7d337299a61e0efe
nuplayer: Fixes in nuplayer Renderer

- Fix in AV sync calculation for video only stream's pause
  scenario

Change-Id: Ie4fae760ca485ee21121cf4018a62d5d86eacb57
Nuplayer: Fix no image or image will be delay issue

- Fix no image or image will be delay issue
  while using Wifi VOD RTSP program

Change-Id: I7b32fb2ef80f46557c6c76118783245f8488812f
libstagefright: Fix for video can't be played if BT is connected

-Issue: Video can't be played if BT is connected.
-Rootcause: Source code to handle fallback to software decoder
 if offload audio track creation fails is not present.
-Fix: Add source code to handle fallback to software decoder
 if offload audio track creation fails.

Change-Id: Ie136a2117dd3f028c962b8b73ebc238bc982d79b
CRs-Fixed:  593230
stagefright: Relinquish lock in OMXCodec while waiting for ANW buffers

This lets CallbackDispatcher continue working in the background
to deliver the component's messages to OMXCodec.

Change-Id: I357e2da269671ef365c004276ea0601d696d2efa
libstagefright: customize delay to post video events

Calculate delay as a function of lateness rather
than fixed 10ms.
When video frames are decoded quite early, this
change will delay the wake up of video events.

We save some unwanted wake up of video events
which save power.

Change-Id: I12839b9df62d453f394894b499491e2cac3a0c8a
CRs-Fixed: 578988
libstagefright: set threshold for earliness

Change the threshold value for earliness to 40ms
This fixes the av sync loss issues.

Change-Id: Ib912048987e8e6187dc37d5dbaff5d1ead224c61
CRs-Fixed: 584417