Merge "better manage buffer for libstagefright_soft_mpeg4enc" into klp-dev am: 021575025c am: 5944b611e5 am: 1a419c7b2a am: 70a63bdf27 am: 40833da7b9 am: 2ad98cf1c7 am: be560fcb1c
am: b9f302c2f0

Change-Id: I840dd96ff4825becf34a89dde03778c6fd61aeef