libmix: Allocate video decoder's output buffers based on the real needs

BZ: 116761

Change-Id: I4124a337c2f0fb9153728e8a51be5a6412e9b5a8
Signed-off-by: Dan Liang <dan.liang@intel.com>
Reviewed-on: http://android.intel.com:8080/114245
Reviewed-by: Shi, PingX <pingx.shi@intel.com>
Reviewed-by: cactus <cactus@intel.com>
Tested-by: Shi, PingX <pingx.shi@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>
4 files changed