Add new output format OUTPUT_NALLENGTHS_PREFIXED

BZ: 156038

this new format structure is like:
    [out-band data] + bitstream
[out-band data] is fixed 256 bytes, contains:
     'nall' + nalnum + nallength[nalnum]
each one is 4 bytes aligned, out-band data is marked with offset.
VideoEncOutputBuffer structure is also extended to support offset.

Change-Id: I572c547be606afe3f7e658e2ef08507f97ff2f3f
Signed-off-by: Zhao Liang <leo.zhao@intel.com>
4 files changed