Philippe Gorley authored Nov 08, 2018 and Adrien Béraud committed Nov 19, 2018

Improves reliability of resampler by setting the input and output
channel counts and by forcing initialization on the first resampling.

Removes redundancy by using the sample format in AudioFormat.

Change-Id: Ie0154d5b46db6735dbc8da81fdb0e6be795a3efa