Uninitialized pointer can cause crash.

mpAudioTrack should be initialized in any case.
If getOutputSamplingRate returns ERROR, this won't be initialized.
As a result, deleting this field in dtor can cause crash.

Change-Id: I950d353361b19635302339dac35752a2514d2d80
Signed-off-by: You Kim <you.kim72@gmail.com>
Long mp3 metadata displays as corrupted file after transfer

Cut the metadata to 1 Byte and return in function
getObjectPropertyList in order to show it properly on a PC.

Change-Id: Iefacf9fa86c20ece2572e6d95d35877a94066fe7