Prepare callbacks to pull buffers working in GET mode
Prepare callbacks to pull buffers working in GET mode

Change-Id: I2728ff130ddd9189fcec3faf0ad0f219d36b7a59

shelsonjava/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,Kurento/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,Kurento/kms-elements