libmix: add a flag indicating whether video decoder buffer contains only one field

BZ: 173283

For some interfaced clips, if video decoder buffer contains
only one field, add a flag to recognize it. Currently it is
only available for AVC.

Change-Id: I90cc291a29626e7bf6b58a042b77c23430da6ba9
Signed-off-by: Tianmi Chen <tianmi.chen@intel.com>
2 files changed