Set channel mask when opening audio sink

Update the code to use the AudioSink::open() interface that
 takes a channel mask as an additional parameter. The code
 is only stereo, and returns an error when attempting to create
 a video editor audio sink with more than two channels.

Change-Id: Ib9bba067da0b286c08656976b89fba7c8b42f99f
3 files changed
tree: e6381a284850cab09068411ae8570fd784775b5a
  1. libvideoeditor/